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Abstract: A Cu metal‐organic framework (MOF), [Cu4(PMTD)2(H2O)3]⋅20 H2O, 1, (where PMTD is 1,4‐phenylenebis(5‐methyl‐4H‐1,2,4‐triazole‐3,4‐diyl)bis(5‐carboxylato‐3,1‐phenylene)bis(hydroperoxymethanide)), with a rare chiral Oh‐type cage, and dual functionalities of open metal sites and Lewis basic sites, based on a designed U‐shaped ligand, was synthesized by hydrothermal methods. It exhibits high CO2, C2, and C3 hydrocarbon storage capacity under atmospheric pressure, as well as high H2 (1.96 wt.%) adsorption capacity at 77 K. Methane purification capacity was tested and verified step by step. Isosteric heats (Qst) studies reveal that CH4 has the weakest van der Waals host–guest interactions among the seven gases at 298 K. Ideal adsorbed solution theory (IAST) calculation reveals that compound 1 is more selective toward CO2, C2H6, and C3H8 over CH4 in further calculating its separation capacity, as exemplified for CO2/CH4 (50:50, 5:95), C2H6/CH4 (50:50, 5:95), or C3H8/CH4 (50:50, 5:95) binary gas mixtures. Breakthrough experiments show that 1 has a significantly higher adsorption capacity for CO2, C2H6, and C3H8 than CH4. The selective adsorption properties of 1 make it a promising candidate for methane purification. [ABSTRACT FROM AUTHOR]

In order to study the relationship of material's physical properties and materials special facet, the special facets need to be obtained firstly. La0, 5 Ca0, 5 MnO3 microcrystals with different morphologies were obtained by hydrothermal method using different concentration of urea, KOH and adjusting the reaction temperature. Characterization methods of powder X-ray diffraction (XRD), scanning electron microscope (SEM) were used to show the crystal structure and morphology information for as-prepared products. The synthesis condition and reactant concentration play important roles in crystal facet tailoring process. The optimal route to prepare octahedral shape of La0, 5 Ca0, 5 MnO3 microcrystal was discussed and its corresponding facet tailoring mechanism was also set up, which is important for further study and application on the relationship of structure and properties of perovskite structure oxides. [ABSTRACT FROM AUTHOR]

Monodisperse and water-soluble lanthanide (Ln3+)-doped Y(Gd)VO4 nanocrystals (NCs) have been successfully synthesized by a fast, facile, and environmentally friendly microwave-assisted route with poly(acrylic acid) as the surfactant. The Y(Gd)VO4:5 %Ln3+ (Ln = Eu, Dy, Sm) NCs have unique fluorescence properties and polydimethylsiloxane (PDMS)-based white solid nanocomposites containing YVO4:5 %Eu3+ NCs show red emission upon UV irradiation. GdVO4 NCs can act as CT and MRI contrast agents as a result of their magnetic and X-ray absorption properties. A layer of SiO2 was coated onto the surfaces of the nanoparticles and MTT assays were carried out to test the cytotoxicity of the YVO4@SiO2 and GdVO4 NCs. The results indicate that the Y(Gd)VO4 NCs have potential in multimodal optical/MRI/CT bio-imaging. [ABSTRACT FROM AUTHOR]

Two novel lanthanide metal organic frameworks [Eu4(bpt)4(DMF)2(H2O)6]·(DMF)5·(H2O)4 (1) and [Tb4(bpt)4(DMF)2(H2O)8]·(DMF)5·(H2O)3 (2) were synthesized under hydrothermal conditions, forming a three-dimensional structure (H3bpt = biphenyl-3,4′,5-tricarboxylate). Single crystal X-ray diffraction reveals that compounds 1 and 2 are heteromorphic and have different topologies due to the change of metal ions with different radii and coordination steric hindrance. The unique luminescence properties of Eu3+ and Tb3+ ions motivated us to dope different amounts of Tb3+ into a single host to obtain light tunable materials. The tunable multicolor emissions, including red, red-orange, orange, yellow and green, can be readily achieved from the doped Ln-MOFs 3–6 by increasing the concentration of Tb3+. In addition, compounds 5 and 6 also exhibit different temperature-dependent luminescence behaviors when the concentration of Eu3+ is low, generating new Ln-MOF thermometers. [ABSTRACT FROM AUTHOR]

The hydrothermal system is considered to be one of the most possible environments for the origin of life. Here we report a hydrothermal reaction from phenol and alanine to four important heterocyclic compounds, 2,3-dihydrobenzofuran ( 1), indoline ( 2), indole ( 3) and 2-methyl-1,2,3,4-tetrahydro­quinoline ( 4). This reaction suggests a prebiotic route to synthesize the heterocyclic compounds which could be precursors for the chemical evolution of life. [ABSTRACT FROM AUTHOR]

Abstract: A green chemistry strategy was developed to prepare two barium copper silicate pigments. Chinese purple BaCuSi2O6 and dark blue BaCu2Si2O7 are synthesized through mild hydrothermal treatment in narrow pH range. The compounds are characterized by powder X-ray diffraction techniques, infrared spectroscopy, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, luminance and magnetic measurements. When excited by a visible laser, hydrothermally synthetic BaCuSi2O6 exhibits a broad emission in the near-infrared region with an excited state lifetime 6.4 μs due to the square-planar Cu2+ ions as the chromophores. Magnetic analysis of BaCuSi2O6 indicates the spin gapped antiferromagnetic property due the presence of the Cu–Cu dimers in the structure. BaCu2Si2O7 shows interesting quasi-one-dimensional antiferromagnetic property. [Copyright &y& Elsevier]

In the present paper, we report a novel hydrothermal synthesis process for the preparation of A-site deficient perovskite-type solid solution in (1−x)BaTiO3·xLa2/3TiO3 (x=0.1–1.0). The synthesized (1−x)BaTiO3·xLa2/3TiO3 have been characterized by powder X-ray diffraction (XRD), ICP elemental analysis, infrared spectroscopy and scanning electron microscopy. The diffractions of samples with x≤0.7 were well indexed as a cubic structure, which is the same as a cubic perovskite-type BaTiO3. In the compositions of x ≥0.8, the crystal structure changes from the cubic to an orthorhombic one. The effect of hydrothermal conditions has also been examined. In this work, it was observed that the optimum ratios of KOH/Ti, La/Ti, and La/Ba were 90, 0.6x and 0.9(1−x), respectively, and the optimum crystallization temperature was 240–260 °C. [Copyright &y& Elsevier]

In this work, Ce 3+ singly doped, Ce 3+ /Tb 3+ and Eu 3+ /K + co-doped BaSiF 6 phosphors have been synthesized via a one-step hydrothermal method. Colour-emitting may be varied by changing relative intensities of Ce 3+ and Tb 3+ through energy transfer in BaSiF 6 phosphors. We found that HF and H 3 PO 4 could facilitate the dissolution of SiO 2 under hydrothermal condition and obtained pure BaSiF 6 host material. The crystal structure and the composition were analysed, and the morphology was examined. Furthermore, the corresponding photoluminescence properties of the rare earth doped BaSiF 6 were characterized. [ABSTRACT FROM AUTHOR]

Fe 2+ and Ti 3+ co-doped anatase TiO 2 nanocrystallites with ca. 50% exposed {001} facets have been successfully synthesized by a facile hydrothermal method. The transition metal dopant induces the stability of Ti 3+ ions in the structure. As-prepared anatase TiO 2 exhibits a broad absorbance in the visible light region, which shows blue colour. Furthermore, these Ti 3+ ions can in situ reduce the noble metal cations to neutral atoms, which form homogeneously nanoclusters on the TiO 2 surface. The noble metal anchored samples show enhanced photocatalysis compared to the original Fe,Co-doped TiO 2 sample under ultraviolet light. Among the noble metal anchored samples, Pd@Fe3–TiO 2 can completely oxidize CO at the mild temperature above 250 °C. [ABSTRACT FROM AUTHOR]

The perovskite orthoferrite SmFeO 3 was synthesized by the hydrothermal method. The Néel temperature of this material was found to be 655 K by temperature-dependent magnetization measurements. Magnetic field-dependent magnetization of the material at 300 K revealed typical weak ferromagnetic behaviour. Dielectric analysis showed a ferroelectric phase transition at 480 K. The structural and magnetic properties of SmFeO 3 were also characterized using Mössbauer spectra, which also confirmed this structural transition. The remanent polarization determined by the positive-up-negative-down (PUND) method was approximately 0.012 μC/cm 2 at 173 K. Therefore, the results presented here indicate that SmFeO 3 is multiferroic at temperatures above room temperature. Our analysis shows that the material's non-centrosymmetric Pna2 1 structure is likely to be responsible for the ferroelectricy in SmFeO 3 rather than the Pbnm structure or the magnetic structure. [ABSTRACT FROM AUTHOR]

A borate compound [Ni(en) 3 ][B 5 O 6 (OH) 4 ][CH 3 COO] ( 1 ) has been synthesized under mild hydrothermal conditions. The newly synthesized compound was characterized by single-crystal X-ray diffraction, elemental analysis and thermogravimetry. The three-dimensional (3D) supramolecular open-framework of compound 1 is constructed by inorganic [B 5 O 6 (OH) 4 ] − building units and organic [CH 3 COO] − anions through hydrogen bonds, and the charge-balancing [Ni(en) 3 ] 2 + cations are located in 3D channels. It is very interesting that there exist two helical chains formed by [B 5 O 6 (OH) 4 ] − building units and organic [CH 3 COO] − anions through hydrogen bonds in compound 1 along different axes. Magnetic measurement indicates that compound 1 exhibits paramagnetic behavior down to 4 K. [ABSTRACT FROM AUTHOR]

Abstract: Sr-doped LaCrO3 (La0.9Sr0.1CrO3 and La0.8Sr0.2CrO3) were synthesized as cube-shaped crystalline phases under mild hydrothermal conditions. All the samples can be prepared in a single step by hydrothermal treatment at 260°C. The crystalline products were characterized by means of powder X-ray diffraction, scanning electron microscope, inductively coupled plasma and EDS. The crystals adopt perovskite-like structure (space group Pnma) and have a narrow particle size distribution in the range of 1–2μm. The content of the reactant KOH and reaction temperature play important roles in the formation of products. The temperature dependence of electrical conductivities of the samples, measured using a DC four-probe method, shows that the conductivities increase with Sr doping, and the behavior of each sample can be ascribed to the small polaron hopping conduction mechanism. All the compounds show an antiferromagnetic transition and relative lower Néel temperatures. [Copyright &y& Elsevier]

Abstract: Hydrothermal synthesis, characterization and magnetic properties of a series of ABO3-perovskites LaFe1−x Cr x O3 (0≤x≤1) are reported. The alkalinity in initial reaction mixtures plays a critical role in controlling the designed stoichiometry of the final compositions. Their magnetic properties are strongly dependent on the compositions and a maximum magnetic moment is found for the sample at x=0.5. Weak ferromagnetic interaction observed for the samples from x=0 to 0.9 arises from the presence of Fe–O–Fe antisymmetric exchange and Fe–O–Cr superexchange interaction. The weak ferromagnetism as well as the linear variation of the lattice parameters implies the possible random distribution of Fe and Cr ions in B sites of the perovskites. The evolution of magnetic ordering transition temperatures has a close relationship with substituent ratios, for the competition of antiferromagnetism and ferromagnetism. The saturated magnetic moment shows a great improvement compared with that for the samples synthesized by solid state method. [Copyright &y& Elsevier]

Abstract: The first organically templated molybdenum iodates (C5H6N)2Mo2O5(IO3)4(H2O)2 (1), (C10H8N2)[MoO2(IO3)3]·H3O (2), and uranium iodate (C5H5N)2[(UO2)(IO3)3](IO3) (3), have been successfully synthesized under mild hydrothermal conditions. Compound 1 is simple zero-dimensional units consisting of [(Mo2O5(IO3)4)]2− anions, which can be described as a tetranuclear unit hanged on either side by two [IO3] groups. The [Mo2O5(IO3)4]2− anions are in a close connection through the water molecules and protonated pyridine cations, via hydrogen bonds and intermolecular actions. Compound 2 is built up from [MoO6] octahedra and [IO3] pyramids to two-dimensional layers, in which 4,4′-bipy molecules and water cations are located, forming strong hydrogen bonds with the inorganic framework, leading to pseudo three-dimensional structure. Compound 3 is one-dimensional ribbons containing {[(UO2)(IO3)3](IO3)}2− anions and charge neutrality is achieved by the protonated 4,4′-bipy cations, which reside between two ribbons, forming hydrogen bonds with the inorganic framework and resulting in pseudo two-dimensional structure. Crystal data are as follows: (C5H6N)2Mo2O5(IO3)4(H2O)2 (1), orthorhombic, Pnma, a =24.097(5)Å, b =13.532(3)Å, c =7.836(16)Å, Z =4, V =2555.2(9)Å3; (C10H8N2)[MoO2(IO3)3]·H3O (2), monoclinic, C2/c, a =24.176(5)Å, b =10.751(2)Å, c =7.5074(15)Å, β =107.44(3)°, Z =8, V =1861.6(6)Å3; (C5H5N)2[(UO2)(IO3)3](IO3) (3), monoclinic, P21/n, a =14.430(3)Å, b =7.3459(15)Å, c =19.811(4)Å, β =106.70(3)°, Z =4, V =2011.3(7)Å3. [Copyright &y& Elsevier]

Abstract: Coordination polymers containing lanthanides with tartaric acid [Ln2(C4H4O6)3(H2O)3]·1.5H2O (Ln=La, Ce, Pr, Nd, Sm and C4H4O6 = d(−) or l(+) tartrate anion) have been synthesized using hydrothermal techniques and characterized by single crystal X-ray diffraction. The compounds are all isotypic with a monoclinic crystal system in the P21/n space group. The asymmetric units of coordination polymers contain two metal centers having different coordination environments. One metal is bonded to four tartrate groups having three d and one l isomers (or three l and one d isomers), whereas the other metal is bonded to five tartrate groups having two d and three l isomers (or two l and three d isomers). Each trivalent metal center is coordinated to nine oxygen atoms that originate from carboxylate and hydroxyl groups of the tartrate anions and water molecules. These new polymers have three-dimensional structures containing open channels that are occupied by non-coordinating water molecules. Thermogravimetric and differential thermal analyses and adsorption of nitrogen have also been studied for these compounds. [Copyright &y& Elsevier]

Abstract: The hydrothermal reaction of 2,5-pyridinedicarboxylic acid (H2PDC), diethylene triamine and In(NO3)3·4.5H2O gave rise to a two-dimensional (2D) coordination polymer In(OH)(2,5-PDC). This compound crystallizes in the orthorhombic space group Iba2, with cell parameters, a =12.656(3)Å, b =20.114(4)Å, c =6.2216(1)Å, V =1583.9(5)Å3 and Z =8. Its structure contains one-dimensional In–O–In–O– chains, which are further linked by 2,5-PDC ligands into a 2D supramolecular neutral framework. The adjacent 2D layers are parallel with each other and construct a three-dimensional framework via hydrogen bands. At room temperature, the compound exhibits intense photoluminescence. On the basis of the results of TG/DTA analyses, the structure is thermally stable up to ∼390°C. [Copyright &y& Elsevier]

Abstract: RMn2O5 (R=La, Pr, Nd, Tb, Bi) crystallites were prepared by a mild hydrothermal method and characterized by powder X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS) and magnetic measurement. The formation of manganates was sensitive to the alkalinities and Mn-containing precursors of the reaction mixtures. This family of manganates is isostructural and has a space group of Pbam. The magnetic measurements for RMn2O5 showed an antiferromagnetic transition. The strong irreversibility between the ZFC and FC curves indicated a helicoidally magnetic structure below 40K. The max d.c. susceptibilities of LaMn2O5+ δ (δ=0.01, 0.06, 0.08, 0.16, 0.17) were found to be variable and the excess oxygen (δ) in the compounds was influenced by the alkalinity used in the hydrothermal synthesis. [Copyright &y& Elsevier]

Abstract: Employing 3-dimethylamino-1-propylamine as a template, a new three-dimensional (3-D) zincophosphite (C5H16N2)·[Zn3(HPO3)4]·H2O has been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction (XRD), FTIR, elemental analysis, powder XRD, and thermogravimetric analysis (TGA). The compound crystallizes in the triclinic space group , with cell parameters, a=8.9884(2)Å, b=10.326(2)Å, c=11.917(2)Å, α=66.98(3)°, β=89.01(3)°, and γ=78.98(3)°, V=997.2(3)Å3 and Z=2. The connectivity of the ZnO4 tetrahedra and HPO3 pseudo pyramids results in inifinite edge-sharing, ladderlike chains of 4-membered rings, which are further linked by Zn–O–P bonds to form a 3-D structure that with interesting 12-membered ring channels along the [100] and [001] directions. The diprotonated amine molecules sit in the middle of the channels along the [100] direction and interact with the framework via hydrogen bonds. There also exist channels with 8-membered ring window along the [100] and [010] directions. [Copyright &y& Elsevier]

Abstract: Two organically templated zincophosphites, [Zn(C4N3H13)][Zn4(HPO3)6]⋅(C4N3H15) and [Zn5(H2O)4(HPO3)6]⋅(C7NH10)2(H2O) were synthesized using diethylenetriamine and benzylamine as templates and characterized by single-crystal X-ray diffraction. [Zn(C4N3H13)][Zn4(HPO3)6]⋅(C4N3H15) crystallizes in orthorhombic Cmca with cell parameters , , . [Zn5(H2O)4(HPO3)6]⋅(C7NH10)2(H2O) crystallizes in triclinic with cell parameters , , , and , , . [Zn(C4N3H13)][Zn4(HPO3)6]⋅(C4N3H15) consist of alternatively linked ZnO4, ZnO2N3 and [] units. In this structure, the structure-directing amines as ligands to zinc are present in two distinct forms, the free state and bonded state, and the two species occurring in channels. [Zn5(H2O)4(HPO3)6]⋅(C7NH10)2(H2O) is made up of ZnO4, ZnO6 and [] moieties forming distinct channels, the protonated aromatic amine molecules are located in the intersection of the channels. In the compounds, the connections ZnO2N3 and ZnO6 of Zn atoms are the first reported in the synthesis of zincophosphite materials. Two zincophosphites, having two-dimensional structures with 4, 6, 8-membered rings channels, were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses. [Copyright &y& Elsevier]

Abstract: A novel three-dimensional organically templated zincophosphite, [C6N2H18]·[Zn3(HPO3)4], was synthesized under milder hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction, differential thermal-thermogravimetric analysis, powder X-ray diffraction, 31P MAS NMR spectrum, and IR spectroscopy. It crystallizes in the monoclinic system, space group C2/c with cell parameters: a =8.7820(4)Å, b =14.9417(7)Å, c =15.4943(5)Å, β =92.940(2)°, and Z =4. The structure consists of a network of strictly alternating ZnO4 tetrahedra and pseudo-pyramid, forming 4-membered ring chains. The structure has a 4.8.16-net and 8- and 16-membered ring channels where completely protonated N,N,N′,N′-tetramethylenediamine cations are encapsulated. The structure is stabilized by template-to-framework hydrogen bonding. In phosphites system, this compound possesses extra-large-pores. [Copyright &y& Elsevier]

Abstract: Employing 4,4′-bipyridine as a bridged ligand, a new three-dimensional (3-D) hybrid zinc phosphate [Zn2(HPO4)2(4,4′-bipy)]·3H2O has been prepared under hydrothermal conditions and characterized by single crystal X-ray diffraction. This compound crystallizes in the monoclinic space group C2/c, with cell parameters, , , , , and . The connectivity of the ZnO3N and HPO4 tetrahedra results in a 2-D neutral layer that with interesting 4,82 net along the bc plane. Furthermore, the 4,4′-bipyridine molecule links the 4,82 net into a 3-D structure. The water molecules sit in the middle of the channels and interact with the framework via hydrogen bonds. The compound exhibits intense photoluminescence at room temperature. [Copyright &y& Elsevier]

Abstract: An organically templated zinc-substituted gallium phosphite, [H3N(CH2)2NH3]1/2 ·[GaZn(HPO3)3(H2O)2] was synthesized under mild hydrothermal conditions in the presence of ethylenediamine (en) as structure-directing agent and characterized by single-crystal X-ray diffraction analysis. It crystallizes in the orthorhombic space group Pbcn with unit cell parameters: a =18.6146(10)Å, b =11.0454(6)Å, c =10.9074(4)Å, V =2242.62(19)Å3 and Z =8. This compound has a three-dimensional framework built up from secondary building units (SBU) of Ga(III) (or Zn(II)) and HPO3 pseudopyramid by sharing vertices. The structure displays a two-dimensional channel system running along the [001] and [010] direction with 5-, 8- and 10-membered rings. The diprotonated ethylenediamine template molecules are located in the channels. In this structure, some of the Ga(III) sites are occupied by Zn(II) atoms. The compound was also characterized by IR spectroscopy, inductively coupled plasma (ICP), X-ray photoelectron spectra (XPS), differential thermal and thermogravimetric analyses. [Copyright &y& Elsevier]

Abstract: Two new copper coordination polymers generated from mixed organic ligands 4,4′-bipydine and 1,2,4-benzenetricarboxylate [Cu3(1,2,4-BTC)2(4,4′-bipy)(H2O)4] 1 and [Cu(1,2,4-HBTC)(4,4′-bipy)] 2 (1,2,4-BTC=1,2,4-benzenetricarboxylate) have been prepared hydrothermally and characterized by single crystal X-ray diffraction. Compound 1 crystallizes in the noncentrosymmetric space group , with , , , , and . Its structure contains two different one-dimensional (1-D) chains for the Cu ions, namely and ; the carboxylate of 1,2,4-BTC ligands links the two different 1-D chains into an interesting steplike neutral framework. Compound 2 crystallizes in the monoclinic space group , with , , , , , . Its structure contains novel paddle-wheel clusters Cu2(CO2)4(4,4′-bipy)2 as SBUs which are further linked by monoprotonated 1,2,4-BTC ligands into a 2-D neutral framework. The magnetic behaviors of both compounds have been studied. [Copyright &y& Elsevier]

Abstract: A layered vanadium selenite, (C4N2H12)0.5[(VO)2(H2O)2(SeO3)2(HSeO3)], has been hydrothermally synthesized and structurally characterized. Its structure is layered and can be described as vanadium selenite oxide layers with diprotonated piperazine occupying the interlayer space. The result of magnetic measurement for the title compound shows a typical antiferromagnetic interaction at low temperature. [Copyright &y& Elsevier]

Abstract: Two novel organically templated zincophosphites, [C6H22N4]0.5⋅[Zn2(HPO3)3] and [C3N2H5]⋅[Zn1.5(HPO3)2] were synthesized using triethylenetetramine and imidazole as templates and characterized by single-crystal X-ray diffraction. [C6H22N4]0.5⋅[Zn2(HPO3)3] crystallizes in monoclinic with cell parameters , , , and , , . [C3N2H5]⋅[Zn1.5(HPO3)2] crystallizes in monoclinic with cell parameters , , , and . Two zincophosphites consist of alternatively linked ZnO4 tetrahedra and [] pseudo pyramidal units. [C6H22N4]0.5⋅[Zn2(HPO3)3] has two-dimensional structure and possesses a triple unit of 4-membered ring building-unit. [C3N2H5]⋅[Zn1.5(HPO3)2] has three-dimensional structure and imidazole cations are located in the 12-membered ring channel systems. Both of the compounds were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses. [Copyright &y& Elsevier]

Abstract: A three-dimensional iron phosphite, , has been synthesized under mild hydrothermal conditions and characterized by single crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P21/c, with unit cell parameters, a =12.4397(3)Å, b =10.1642(3)Å, c =9.3201(3)Å, and Z =4. The compound forms three-dimensional framework with six-membered channels along the c-axis. The Fe center in the framework adopts slightly distorted octahedral coordination geometry and is bridged by the pseudo-pyramidal phosphites. Magnetic measurement indicates the anti-ferromagnetic interactions in the title compound. [Copyright &y& Elsevier]

Abstract: A organically templated vanadium(IV) phosphite, [C2N2H10]·[(VO)3(H2O)(HPO3)4]·H2O, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system with the space group P21/c and cell parameters a =12.3052(7)Å, b =11.8124(7)Å, c =12.687(8)Å, β =98.840(5)°, V =1822.30(19)Å3 and Z =4. The three-dimensional network is built up from the corner linkage of new pentameric secondary building units based on two HPO3 pseudo pyramids and three VO6 octahedra sharing vertices. The framework delimits large 10-membered zigzag tunnels along [100] and smaller eight-membered ones along [001]. The water molecules and the diprotonated amines are inserted in the channels. IR spectroscopy, ESR spectra and magnetic susceptibility data for this compound are given. [Copyright &y& Elsevier]

Abstract: Two perovskite rare-earth manganites RMnO3 (R=Ho, Dy) were synthesized from the hydrothermal redox reactions of KMnO4 and MnCl2 at 250°C and characterized by means of X-ray diffraction, scanning electron microscopy and SQUID. They are orthorhombic, whereas the hexagonal phases, which were competitive strongly with the orthorhombic phases in solid-state reactions, are avoided in the hydrothermal systems. The pure metastable manganites may serve as a model for understanding the magnetisms of Jahn–Teller distortion and charge ordering. This new synthetic approach leaves many rooms for new doped or undoped RMnO3 compounds. [Copyright &y& Elsevier]

A novel three-dimensional inorganic–organic hybrid compound, Mn(H2O)[HO3PCH2NH(CH2CO2)2] from a hydrothermal reaction of Mn (II) ion with N-(phosphonomethyl)iminodiacetic acid (H4PMIDA) was reported. The compound crystallizes in the monoclinic P21/n with cell dimensions of a=5.215(5) Å, b=14.111(15) Å, c=12.727(12) Å, β=93.646(16)°, V=934.6(16) Å3 and Z=4. In this structure each Mn atom is six-coordinated with the carboxylic groups and phosphonic groups to form layers along the bc plane. These layers are further connected with the organic moieties of H2PMIDA, resulting in a complicated three-dimensional network structure. Thermogravimetric analysis, IR spectrum and magnetic susceptibility of this compound are given. [Copyright &y& Elsevier]

Two novel organically templated zincophosphites, [C6H4(CH2NH3)2]·[Zn3(HPO3)4] and [CH3CH2CH2NH3]2·[Zn3(HPO3)4] have been synthesized under hydrothermal conditions with different template 1,3-Bis(aminomethyl)benzene and propylamine, and characterized by single-crystal X-ray diffraction. [C6H4(CH2NH3)2]·[Zn3(HPO3)4] crystallizes in the monoclinic space group P21/c, with cell parameters, a=9.5467(10) A˚, b=26.405(2) A˚, c=7.9946(8) A˚, and β=99.472(2)°. [CH3CH2CH2NH3]2·[Zn3(HPO3)4] crystallizes in the orthorhombic space group Pccn, with cell parameters, a=9.8162(15) A˚, b=23.284(4) A˚, and c=8.9306(12) A˚. Two compounds consist of vertex linking of ZnO4 tetrahedral and [HPO32−] pseudopyramidal units. They have similar inorganic frameworks with the same compositions. They are both built up from two-dimensional layers with four- and eight-membered rings and one-dimensional chains composed of four-memberd rings, but their layered structures are different due to the influence of corresponding organic template. To our knowledge, [C6H4(CH2NH3)2]·[Zn3(HPO3)4] is the first mention of a zinc phosphite material with an aromatic template. Two compounds were also characterized by IR spectroscopy, thermogravimetric and differential thermal analyses, and proton-decoupled 31P MAS solid-state NMR spectroscopy. [Copyright &y& Elsevier]

Two organically templated zincophosphites, (C6H14N2)·[Zn3(HPO3)4] and (C4H14N2)·[Zn3(HPO3)4] have been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction. (C6H14N2)·[Zn3(HPO3)4] crystallizes in the triclinic space group P1¯, with cell parameters, a=9.363(4) A˚, b=10.051(4) A˚, c=10.051(4) A˚, α=85.777(13)°, β=82.091(9)°, and γ=79.783(9)°. (C4H14N2)·[Zn3(HPO3)4] crystallizes in the monoclinic space group P21/c, with cell parameters, a=9.9512(3) A˚, b=10.1508(3) A˚, c=17.8105(5) A˚, and β=95.6510(10)°. Although the two structures are different, they have the same anionic framework compositions of [Zn3(HPO3)4]2−. Their frameworks are built up from strictly alternating ZnO4 tetrahedra and HPO3 pseudo pyramids by sharing vertexes. There exist channels with an eight-membered ring window along the a- and c-axis. Powder X-ray diffraction, IR spectroscopy, 31P MAS solid-state NMR, thermogravimetric and differential thermal analyses were also carried out. [Copyright &y& Elsevier]

A layered vanadium selenite with the composition of β-(H3NCH2CH2NH3)[(VO)(SeO3)2], has been prepared by the reaction of V2O5, VOSO4, with SeO2 under hydrothermal condition in the presence of ethylenediamine. It is characterized by single-crystal X-ray diffraction, inductively coupled plasma, differential thermal–thermogravimetric analysis and magnetic susceptibilities. β-(H3NCH2CH2NH3)[(VO)(SeO3)2] crystallizes in the monoclinic space group P21/c with crystal data: a=9.2476(4) A˚, b=10.3475(4) A˚, c=9.5088(6) A˚, β=96.484(10)°, V=904.07(8) A˚3, Z=4, R1 [I>2θ(I)]=0.0174, wR2 [I>2θ(I)]=0.0451. The structure of the layered compound, β-(H3NCH2CH2NH3)[(VO)(SeO3)2], can be described as an inorganic net of isolated VO6 octahedral, each sharing four corners with four adjacent SeO3 trigonal pyramids. The connectivity between the VO6 octahedra and the SeO3 pyramids creates V4Se4O1012− ladder which are intercrossed through VO6 octahedra to form the anionic layers of the stoichiometry, [VSe2O7]2−. [Copyright &y& Elsevier]

Two organically templated zincophosphites, [CH3CH(NH3)CH2NH3]·[Zn2(HPO3)3]·H2O (1) and [H3N(CH2)6NH3]·[Zn3(HPO3)4] (2) were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group P21/c with cell parameters: a=9.9875(13) A˚, b=10.3402(11) A˚, c=14.4373(16) A˚, β=102.093°, and Z=4. It possesses a layered architecture and organic template molecules located between the inorganic layers forming hydrogen bonds. The inorganic layers, which consist of four-, eight-membered rings, are constructed of alternating ZnO4 tetrahedra and [HPO32−] pseudo-pyramid by sharing vertices. Each four-membered ring is capped by a [HPO32−] pseudo-pyramid. The 1,2-diammonium-propane template molecules are located above the eight-membered rings. Compound 2 crystallizes in the orthorhombic system, space group Pbcn with cell parameters: a=8.8754(14) A˚, b=16.667(3) A˚, c=13.864(2) A˚, and Z=4. It is built up from three-dimensional Zn/P/O frameworks. Corner-linked ZnO4 tetrahedra and [HPO32−] pseudo-pyramids form four-, six-, eight-membered rings and 12-membered ring channels. 1,6-diaminohexane cations are located in the 12-membered ring channel systems. Two compounds were characterized by IR spectroscopy, and differential thermal and thermogravimetric analyses. [Copyright &y& Elsevier]

A new three-dimensional organically templated [C4N2H12]0.5·[Zn3(HPO3)4]·H3O was hydrothermally synthesized and characterized by single crystal X-ray diffraction. The three-dimensional framework is built up from two-dimensional layers with 4.8-membered rings and one-dimensional chains of 4-membered rings. The structure has strictly alternating ZnO4 tetrahedra and HPO3 pseudo pyramids which are linked through their vertices giving rise to the three-dimensional architecture with 8,12-membered ring channels. The protonated water molecules and diprotonated piperazine are located in the 8-membered and 12-membered channels, respectively. The compound crystallizes in monoclinic system, space group P21/n with cell parameters, a=9.6739(16) A˚, b=8.4528(13) A˚, c=20.257(4) A˚, β=97.966(5)°, Z=4, R=0.023, and Rw=0.060. It was characterized by the powder X-ray diffraction, differential thermal-thermogravimetric analyses, IR spectroscopy and proton-decoupled 31P MAS NMR solid-state spectroscopy. [Copyright &y& Elsevier]

A novel compound, [HN(C2H4)3N][(VO)2(HPO3)2(OH)(H2O)]·H2O, was hydrothermally synthesized and characterized by single crystal X-ray diffraction. This compound crystallizes in the monoclinic system with the space group C2/c and cell parameters a=11.0753(3) A˚, b=17.8265(6) A˚, c=16.5229(5) A˚, and β=92.362(2)°. The structure of the compound consists of vanadium phosphite layers which are built up from the infinite one-dimensional chains of [(VO)(H2O)(HPO3)2]2− of octahedral VO5(H2O) and pseudo pyramidal [HPO3], and bridging binuclear fragments of [VO(OH)]2. Thermogravimetric analysis and magnetic susceptibility data for this compound are given. [Copyright &y& Elsevier]

Two novel vanadium selenites {[VO(OH)(H2O)](SeO3)}4·2H2O 1 and (H3NCH2CH2NH3)[(VO)(SeO3)2] 2 were synthesized by hydrothermal method and their crystal structures were determined by single-crystal X-ray diffraction. It is characterized by inductively coupled plasma (ICP), thermogravimetric (TG) and elemental analyses. Compound 1 crystallizes in the monoclinic system, space group C2/c, a=21.2250(11) A˚, b=12.6309(6) A˚, c=17.0249(10) A˚, β=96.830(3)°, V=4531.8(4) A˚3 and Z=8, R1 [I>2σ(I)]=0.0344, wR2 [I>2σ(I)]=0.119; Compound 2 crystallizes in the monoclinic system, space group P21/c, a=9.6389(4) A˚, b=6.9922(3) A˚, c=15.0324(5) A˚, β=102.297(2)°, V=989.90(7) A˚3 and Z=4, R1 [I>2σ(I)]=0.0452, wR2 [I>2σ(I)]=0.117. {[VO(OH)(H2O)](SeO3)}4·2H2O has a 1D structure constructed from the {[VO(OH)(H2O)](SeO3)}∞ chains. (H3NCH2CH2NH3)[(VO)(SeO3)2] has a layered structure composed of alternating VO5 and SeO3 units with protonated ethylenediamine as interlayer guest. [Copyright &y& Elsevier]

CaWO 4 and Ca 0.72 La 0.28 WO 4 samples were synthesized via mild hydrothermal method at 180 °C. Composition, phase purity, morphology and W element binding energy were characterized by induced couple plasma atomic emission spectrum (ICP-AES), powder x-ray diffraction (XRD), scanning electron microscopy (SEM), x-ray energy dispersive spectroscopy (EDS), and x-ray photoelectron spectroscopy (XPS). UV–vis absorption spectroscopy shows absorption peak shift due to La 3+ doping, which induced to the presence of mixed valence states of W 5+ and W 6+ in scheelite-type structure compound. Hence, blue shift of UV–vis absorption from 350 nm to 405 nm was observed in La 3+ -doped calcium tungstate. [ABSTRACT FROM AUTHOR]

Abstract: A dinuclear oxovanadium compound [V2O2(l-his)2(2,2′-bipy)2]·[C2H6O2 ·(2,2′-bipy)] was synthesized under hydrothermal condition and characterized by single-crystal X-ray diffraction. X-ray crystallography revealed that each vanadium center is six coordinated and adopts a distorted octahedral structure. IR spectroscopy, ESR spectrum and magnetic susceptibility data for this compound are given. X-band ESR spectroscopy of the sample indicated the existence of vanadium(IV) ions in the compound. The temperature dependent magnetic susceptibility data showed the presence of a ferromagnetic coupling between the two V(IV) ions in the range 4–180K. [Copyright &y& Elsevier]

A series of BaSiF6:xEu3+ (x = 3-20%), BaSiF6:15%Eu3+/15%K+, and BaSiF6:3%Eu3+/2%Tb3+ down-conversion phosphors are hydrothermally prepared using hydrated SiO2 and NH4HF2 as metal chelating agents. [ABSTRACT FROM AUTHOR]

Single crystals of β-Li3VF6 (I) and Na3VF6 (II) are obtained by hydrothermal reaction of stoichiometric amounts of NH4VO3, NH4HF2, LiCl (NaCl), and fumaric acid (pH 4-6, autoclave, 240 °C, 24 h) without the need for HF. [ABSTRACT FROM AUTHOR]

The title compound is hydrothermally prepared from a solution of Y(NO3)3, NiSO4, MnO2, and KOH (autoclave, 533 K, 3 d) and characterized by powder XRD, SEM, XPS, and electric and magnetic measurements. [ABSTRACT FROM AUTHOR]