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A terbium 2,6-naphthalenedisulfonic acid compound, [Tb(H2O)9]Cl(C10H6O4S4)2 (C10H6O4S42− = 2,6-naphthalenedisulfonate), is prepared and characterized by single-crystal X-ray diffraction. This compound is characterized by an isolated structure with the terbium ion possessing a mono-capped square antiprism coordination geometry. The [Tb(H2O)9]3+ cations and (2,6-naphthalenedisulfonic acid)2− anions are linked by hydrogen-bonding interactions to yield a three-dimensional supramolecular network. The solid state luminescence spectrum reveals that this compound shows the strongest emission band in the red region. The luminescence emission peaks can be ascribed to the characteristic emissions of the 4f electron intrashell transitions 5D4 → 7F5, 5D4 → 7F4 and 5D4 → 7F2 of the Tb3+ ion. The CIE (Commission Internationale de L'Eclairage) chromaticity coordinates are (0.5647, 0.4338). Solid-state UV/Vis diffuse reflectance spectra reveal that compound 1 shows a wide optical band gap of 4.92 eV. A novel terbium 2,6-naphthalenedisulfonic acid compound is prepared and characterized [ABSTRACT FROM AUTHOR]

A new compound [Gd(H2O)4(HIA)2(NO3)](2NO3) (1; HIA is isonicotinic acid) is reported. The Gd3+ cation is coordinated by eight oxygen atoms and exhibit a square antiprismatic GdO8 geometry. A three-dimensional (3-D) supramolecular framework is formed by hydrogen bond interactions. The photoluminescence absorption peak is ascribed to the 8S7/2→6IJ, while the photoluminescence emission peaks are originated from the characteristic emission of the 6P5/2→8S7/2 and 6P7/2→8S7/2 transitions of Gd3+ ions. A solid-state UV/Vis diffuse reflectance spectrum reveals that it shows a wide optical band gap of 3.17 eV. A new gadolinium compound is reported. It features a 3-D supramolecular framework formed by hydrogen bond interactions. The photoluminescence absorption peak is ascribed to the 8S7/2→6IJ, while the emission is originated from the characteristic emission of the 6P5/2→8S7/2 and 6P7/2→8S7/2 transitions of the Gd3+ ion. It possesses a wide optical band gap of 3.17 eV. [ABSTRACT FROM AUTHOR]

A hydrothermal reaction results in the formation of a novel [Pr2(2,5-PA)2(2,5-HPA)2(H2O)4] n ·2 n H2O complex (2,5-H2PA = 2,5-pyridinedicarboxylic acid). The complex is structurally characterized by single-crystal X-ray diffraction and crystallizes in the space group P 21 of the monoclinic system with two formula units in one cell. This praseodymium complex is characterized by a two-dimensional layered structure. A solid-state photoluminescence experiment reveals that the praseodymium complex shows an emission in the red region. The complex has Commission Internationale de I'Éclairage chromaticity coordinates of 0.5495 and 0.4492. The photoluminescence emission bands could be assigned to the characteristic emission of the 4 f electron intrashell transition of the 3 P 0 → 3 H 5, 1 D 2 → 3 H 4, 3 P 0 → 3 H 6, 3 P 0 → 3 F 2, and 3 P 1 → 3 F 3 of the Pr3+ ions. The energy transfer mechanism is explained by the energy level diagrams of the praseodymium ions and the 2,5-H2PA ligand. A solid-state diffuse reflectance measurement shows that the complex possesses a wide optical band gap of 3.48 eV. [ABSTRACT FROM AUTHOR]

One cadmium-bipyridinium compound, (CdCl4)(CH3-4,4′-Hbipy-CH2CH3)2 (1) with the CH3-4,4′-Hbipy-CH2CH3 generated in situ, has been synthesized from a solvothermal reaction and structurally characterized by a single-crystal X-ray diffraction. The title compound is characterized by an isolated structure and the cadmium atom is coordinated by four chlorine atoms. The CH3-4,4′-Hbipy-CH2CH3+ cation and CdCl42− anion interconnect together through hydrogen-bonding interactions to yield a three-dimensional supramolecular network. Fluorescence spectra exhibit a wide and strong emission in the blue region. Theoretical calculations reveal that this emission can be ascribable to the ligand-to-ligand charge transfer (LLCT). [ABSTRACT FROM AUTHOR]

A novel thulium p-hydroxybenzenesulfonate complex [Tm(C6H5O4S)2(H2O)6](C6H5O4S)·3H2O (1) was solvothermally synthesized and characterized by elemental analyses, photoluminescence, solid-state UV/vis diffuse reflectance, magnetic measurements and single-crystal X-ray diffraction. Complex 1 features an ionic structure with the thulium ion possessing a square antiprismatic geometry. Complex 1 crystallized in the monoclinic system with space group P21. Photoluminescent measurements with solid-state sample demonstrate that the anti-Stokes emission bands in the red/NIR spectral region 710 and 812 nm are observed from the Tm3+ 4f intrashell transitions from the 3F2,3 excited states to the 3H6 and 1G4 excited state to the 3H5 state, respectively. Solid-state UV/vis diffuse reflectance spectra of complex 1 show the existence of a wide optical band gap of 3.56 eV. Variable-temperature magnetic susceptibility and field dependence magnetization measurements are also studied and the magnetic susceptibility obeys the Curie-Weiss law (χm=c/(T−θ)) with the value C being of 8.6 K and a negative Weiss constant θ being of −0.2 K. [ABSTRACT FROM AUTHOR]

By virtue of a solvothermal reaction, a new cadmium-bipyridinium derivative (N,N′-dimethyl-4,4′-bipyridinium)3(CdCl3-HCl-CdCl3)(CdBr4)2(1) with the N,N′-dimethyl-4,4′-bipyridinium cation obtainedin situ, was synthesized and characterized by X-ray single-crystal diffraction method. The title compound is characteristic of an isolated structure. The anions and cations in1are connected through hydrogen-bonding interactions to give a two-dimensional (2-D) supramolecular layer. The fluorescence result discovers a wide emission band in the green region. [ABSTRACT FROM PUBLISHER]

A new cadmium-biimidazole compound, [Cd(2,2′-biimidazole)2(ClO4)]nnOH·2nH2O (1), has been obtained via solvothermal reactions and structurally characterized by X-ray single-crystal diffraction. Compound 1 crystallizes in the space groupP21/cof the monoclinic system with four formula units in a cell:a= 6.8785(11),b= 17.938(3),c= 14.985(2) Å, β=91.589(2)°,V= 1848.3(5) Å3, C12H17CdClN8O7,Mr= 533.19,Dc= 1.916 g/cm3,S= 1.048, μ(MoKα) = 1.383 mm−1,F(000) = 1064,R= 0.0326, andwR= 0.0900. Compound 1 is characteristic of an infinite one-dimensional chain-like structure. [ABSTRACT FROM PUBLISHER]

A novel zinc compound with mixed ligands, Zn2(bipy)(bim)4·(ClO4)4·2H2O ( 1) (bipy = 4, 4′-bipyridine; bim = 2, 2′-biimidazole), was hydrothermally prepared and characterized by elemental analysis, IR spectroscopy, photoluminescence and single-crystal X-ray diffraction. Compound 1 is characteristic of an isolated structure with two five-coordinated zinc ions bridged by a bipy ligand to form a dumbbell-like motif. Compound 1 is of rhombohedral system, space group R-3 with a = 25.7698(5), c = 19.0359(7) Å, V = 10947.8(5) Å3, C34H36Cl4N18O18Zn2, Z = 9, M r = 1257.35, D c = 1.716 g/cm3, S = 1.045, μ(Mo Kα) = 1.298 mm-1, F(000) = 5742, R = 0.0489 and wR = 0.1337. Photoluminescence investigation reveals that compound 1 displays an emission band in the green region. In combination with the theoretical studies, it is believed that the emission must arise from the ligand-to-ligand charge-transfer (LLCT) transition. [ABSTRACT FROM AUTHOR]

Two new isonicotinic acid-containing lanthanide complexes, [Eu(HL)3(H2O)2]2n·(nH5O2)(nHgCl5)(2nHgCl4)·(2nH2O) (1) and [GdL2(H2O)4]nnCl (2) (HL = isonicotinic acid), have been synthesized via hydrothermal reactions and structurally characterized by X-ray single-crystal diffractions. Complex 1 crystallizes in the space groupC2/cof the monoclinic system with four formula units in a cell:a= 24.2129(9),b= 20.7750(8),c= 15.2980(6) Å,β =128.32°,V= 6037.1(4) Å3, C36H47Cl12Eu2Hg3N6O20,Mr= 2214.89,Dc= 2.437 g/cm3,S= 0.994,μ(MoKα) = 10.253 mm–1,F(000) = 4140,R= 0.0425 andwR= 0.0800. Complex 2 crystallizes in the space groupPbcnof the orthorhombic system with four formula units in a cell:a= 8.947(4),b= 19.616(9),c= 10.086(5) Å,V= 1770.1(14) Å3, C12H16ClGdN2O8,Mr= 508.97,Dc= 1.910 g/cm3,S= 1.009,μ(MoKα) = 3.938 mm–1,F(000) = 988,R= 0.0276 andwR= 0.0674. Both complexes are characteristic of infinite one-dimensional (1-D) polycationic chain-like structures. [ABSTRACT FROM PUBLISHER]

A new porphyrin FeBr [TCPP-(CH3)4]·0.5(CH3OH) (1), (TCPP =meso-tetra (4-carboxyphenyl) porphyrin), has been synthesized via a solvothermal reaction and characterized by X-ray diffraction. Compound 1 is characterized as an isolated structure with a distorted nonplanar porphyrin macrocycle and an embedded FeIIIion coordinating to four pyrrole nitrogen atoms and one bromine atom. The TCPP is esterified with methanol. The reaction mechanism and photophysical properties were explored. [ABSTRACT FROM PUBLISHER]

A series of transition metal-n cyanopyridines (i.e. pyridine-n-carbonitrile; n = 2, 3, 4) complexes with one-dimensional (1-D) structures, [CuCl2 (pyridine-3-carbonitrile)2]n, [CuCl2 (pyridine-4-carbonitrile)2]n and [CoCl2(pyridine-4-carbonitrile)2]n, have been synthesised via hydrothermal reactions and structurally characterised by single-crystal X-ray diffraction. All these complexes feature infinite 1-D chain-like structures. Photoluminescent investigation reveals that the title complexes display strong emissions which may originate from π→π* charge-transfer interaction of the ligands. [ABSTRACT FROM AUTHOR]

Two novel samarium and thulium compounds [Sm(H 2 O) 2 (IA) 3 Hg 2 Cl 5 (HgCl 2) 1.5 ·H 3 O (1) and [Tm(H 2 O) 2 (IA) 3 Hg 2 Cl 5 (HgCl 2) 1.5 ·H 3 O (2) (IA ​= ​isonicotinate anion) have been prepared under hydrothermal conditions and structurally characterized by a single-crystal X-ray diffraction technique. They are isostructural and characterized by a two-dimensional (2-D) layer structure. The solid-state photoluminescence experiments unveiled that compound 1 shows a brownish emission band, while compound 2 exhibits three emission bands. These emission bands are resulted from the characteristic emissions of the 4 f electrons intrashell transitions of 4 G 5/2 ​→ ​6 H 7/2 of the Sm3+ ion and 1 G 4 → 3 H 6 , 1 G 4 → 3 F 4 and 3 F 2,3 ​→ ​3 H 6 of the Tm3+ ion. An energy transfer mechanism is proposed by an energy level diagram of the Sm3+, Tm3+ ions and the isonicotinic acid ligand. Compounds 1 and 2 have remarkable CIE chromaticity coordinates of (0.5261, 0.4615) and (0.2329, 0.218). The solid-state UV/visible diffuse reflectance spectra shows that compounds 1 and 2 have wide optical band gaps of 3.22 ​eV and 3.15 ​eV, respectively. Two novel samarium and thulium compounds have been reported. They are isostructural and feature a 2-D layer. Their photoluminescence emission bands can be assigned to the characteristic emissions of 4 G 5/2 ​→ ​6 H 7/2 of the Sm3+ ion and 1 G 4 → 3 H 6 , 1 G 4 → 3 F 4 and 3 F 2,3 ​→ ​3 H 6 of the Tm3+ ion. Their energy transfer mechanism is explained by an energy level diagram. They exhibit CIE chromaticity coordinates of (0.5261, 0.4615) and (0.2329, 0.218). They possess wide optical band gaps of 3.22 ​eV and 3.15 ​eV. Image 1 • It reports two novel samarium and thulium compounds. • The emission bands result from the characteristic emissions of 4 G 5/2 ​→ ​6 H 7/2 of the Sm3+ ion and 1 G 4 → 3 H 6 , 1 G 4 → 3 F 4 and 3 F 2,3 ​→ ​3 H 6 of the Tm3+ ion. • They have remarkable CIE chromaticity coordinates. • An energy transfer mechanism is explained by an energy level diagram. • They have wide optical band gaps of 3.22 ​eV and 3.15 ​eV. [ABSTRACT FROM AUTHOR]

A novel europium complex was synthesized. It features a binuclear structure. A photoluminescence measurement with solid-state samples reveals that it can emit brown photoluminescence. It has CIE (Commission Internationale de I'Éclairage) chromaticity coordinates (0.557, 0.4292) and its CCT (Correlated Color Temperature) is 1871 K. The solid-state diffuse reflectance spectra reveals that it has a wide semiconducting bandgap of 4.09 eV. [Display omitted] • It reports a novel europium complex with a binuclear structure. • It displays brown photoluminescence. • It has CIE chromaticity coordinates (0.557, 0.4292) and its CCT is 1871 K. • The semiconductor bandgap is 4.09 eV. A new europium compound [Eu 2 (H 2 O) 8 (MBA−) 4 ](2MBA−) (1 ; MBA− = methylsulfanyl-benzoic acid anion) was synthesized via an in situ reaction of EuCl 3 ·6H 2 O, 4,4′,4″-(1,3,5-triazine-2,4,6-triyltrisulfanediyl)tribenzoic acid, methanol and distilled water under hydrothermal conditions. The crystal structure is characterized by single-crystal X-ray diffraction and features a binuclear structure. The molecules are interlinked via hydrogen-bonding interactions to form a one-dimensional (1-D) supramolecular chain. A photoluminescence measurement with solid-state samples reveals that compound 1 can emit brown upconversion photoluminescence with the maximum peak locating at 622 nm and a weaker one at 590 nm. The bands are ascribed to the characteristic emission of the 4 f electron intrashell transition of the 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 of the Eu3+ ions. Compound 1 exhibits CIE chromaticity coordinates (0.557, 0.4292) and its CCT is 1871 K. The solid-state diffuse reflectance spectra reveals that compound 1 has a bandgap of 4.09 eV. [ABSTRACT FROM AUTHOR]

• It reports a novel praseodymium complex. • It is characterized by a 3-D framework structure. • It can emit red photoluminescence. • It has CIE chromaticity coordinates of (0.6418, 0.3578). • It shows a wide optical band gap of 3.28 eV. A novel praseodymium complex [Pr(2,5-pyridinedicarboxylic acid)(NA)H 2 O] n (1; NA = the nicotinic acid anion) has been prepared via an in situ hydrothermal reaction and the crystal structure is characterized by single-crystal X-ray diffraction. The nicotinic acid anion is originated from the decarboxylation reaction of the 2,5-pyridinedicarboxylic acid molecules. The Pr3+ ion in complex 1 is eight-coordinated and displays a slightly distorted square anti-prism geometry. Complex 1 features a three-dimensional (3-D) framework. A solid-state photoluminescence measurement shows that complex 1 can emit red photoluminescence with the maximum peak locating at 613 nm, which can be ascribed to the characteristic emission of the 4f electron intrashell transition of the 1D 2 → 3H 4 (Pr3+ ions). Complex 1 has CIE (Commission Internationale de I'Éclairage) chromaticity coordinates of 0.6418 and 0.3578. A solid-state UV/visible diffuse reflectance spectroscopy reveals that the semiconductor band gap of complex 1 is 3.28 eV. A novel praseodymium complex has been prepared via an in situ hydrothermal reaction. The nicotinic acid anion is originated from the decarboxylation reaction of the 2,5-pyridinedicarboxylic acid molecules. The Pr3+ ion is eight-coordinated and displays a slightly distorted square anti-prism geometry. It features a 3-D framework. It can emit red photoluminescence, which is ascribed to the 1D 2 → 3H 4 (Pr3+ ions). It has CIE chromaticity coordinates of 0.6418 and 0.3578. The semiconductor band gap is 3.28 eV. [Display omitted] [ABSTRACT FROM AUTHOR]

A novel porphyrin-(60)fullerene complex [bis(5,10,15,20-tetra-3-pyridinyl-21H, 23H-porphine)](60)-fullerene tetrahydrate, C 60 (Por) 2 ·4H 2 O (1 ; Por ​= ​5,10,15,20-tetra-3-pyridinyl-21H,23H-porphine) was synthesized via a hydrothermal reaction of 5,10,15,20-tetra-3-pyridinyl-21H,23H-porphine, C 60 , xylene and distilled water. The crystal structure is characterized by single-crystal X-ray diffraction. Compound 1 is characteristic of an isolated structure and each molecule contains two 5,10,15,20-tetra-3-pyridinyl-21H,23H-porphine moieties surrounding one C 60 moiety, accompanied by four lattice water molecules. The porphine molecule features a saddle-distorted nonplanar macrocycle. The molecules in 1 are interconnected through van der Waals interactions to yield a supramolecular network. The photophysical properties of 1 in ethanol solution have been studied by photoluminescence and UV–Vis–NIR absorbance. A solution photoluminescence measurement shows that compound 1 can emit red photoluminescence with the maximum peak locating at 656 ​nm. Compound 1 has CIE (Commission Internationale de I'Éclairage) chromaticity coordinates of 0.70 and 0.30. The lifetime is 1.501 u s and the quantum yield of 1 is 0.9%. A novel metal-free porphyrin-(60)fullerene compound was synthesized by a hydrothermal reaction. It features an isolated structure with the porphyrin macrocycle features a saddle-distorted conformation. Every two porphyrin moieties embrace one C60 moiety to form a hamburger-like structure. This compound exhibits two red photoluminescence emission peaks and they can be attributed to the characteristic emissions of the porphyrin. The CIE chromaticity coordinates of the compound are resided at 0.70 and 0.30 and the CCT (Correlated Color Temperature) is 68898 ​K. [Display omitted] • It reports a novel metal-free porphyrin-(60)fullerene compound. • It is characterized by a hamburger-like structure. • It can emit red photoluminescence. • It has CIE chromaticity coordinates of (0.70, 0.30). [ABSTRACT FROM AUTHOR]

Three novel isostructural lanthanide complexes are reported. They feature a ladder-shaped 1- D double chain structure. They display different photoluminescence emission bands. Their emission bands can be ascribed to the characteristic emissions of the 4 f electron intrashell transition of the 4 G 5/2 → 6 H J (J = 5/2, 7/2, 9/2; Sm(III) ions), 6 P 5/2 → 8 S 7/2 (Gd(III) ions) and 4 F 9/2 → 6 H 13/2 (Dy(III) ions). They have CIE chromaticity coordinates of (0.518, 0.4806) and (0.4623, 0.5362) and their CCT are 2415 K and 3422 K. They have optical band gaps of 1.5 eV, 4.6 eV and 3.3 eV. [Display omitted] • It reports three novel lanthanide complexes. • They are characterized by a ladder-shaped 1- D double chain structure. • They show different photoluminescence, CIE color coordinates and CCT. • They have optical band gaps of 1.5 eV, 4.6 eV and 3.3 eV. Series of novel lanthanide complexes [Ln(4-carboxybenzenesulfonate)(H 2 O) 5 ] n n Cl (Ln = Sm (1), Gd (2), Dy (3)) have been synthesized through solvothermal reactions and the structures were characterized by single-crystal X-ray diffraction. They are isostructural with a ladder-shaped one-dimensional (1- D) double chain structure. The solid-state photoluminescence measurements reveal that complexes 1 and 2 display emission bands in yellow and ultraviolet region, while complex 3 shows an upconversion emission band in the green region. These emission bands are resulted from the characteristic emissions of the 4 f electron intrashell transition of the 4 G 5/2 → 6 H J (J = 5/2, 7/2, 9/2; Sm(III) ions in 1), 6 P 5/2 → 8 S 7/2 (Gd(III) ions in 2) and 4 F 9/2 → 6 H 13/2 (Dy(III) ions in 3). Complexes 1 and 3 possess CIE (Commission Internationale de I'Éclairage) chromaticity coordinates of (0.518, 0.4806) and (0.3318, 0.6483), respectively. The CCT (Correlated Color Temperature) are 2415 K and 5609 K for complexes 1 and 3. The solid-state UV/visible diffuse reflectance spectra reveal that complexes 1 , 2 and 3 have optical band gaps of 1.5 eV, 4.6 eV and 3.3 eV, respectively. [ABSTRACT FROM AUTHOR]