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Four new phosphites/phosphates, namely Al[P2O3(OH)3](H2O), Al[(HPO3)(OH)(H2O)], Ca[HPO3] and Al3P6O19.5, were designed and synthesized by low temperature flux methods. They crystallized in P63mc, P1¯, P43212, and P63/m space groups, respectively. The basic units of Al[P2O3(OH)3](H2O), Al[(HPO3)(OH)(H2O)] and Ca[HPO3] are composed of [PO3]3− or/and [AlO6]9− groups, whereas the structure of Al3P6O19.5 is built from [PO4]3− tetrahedra and [AlO6]9− octahedra. The structure of Al[P2O3(OH)3](H2O) features a two-dimensional (2D) layered motif of Al[P2O3(OH)3]. Meanwhile, Al[(HPO3)(OH)(H2O)] has high porosity and relatively large channels, and has an excellent molecular sieve structure. Both Al[P2O3(OH)3](H2O) and Al[(HPO3)(OH)(H2O)] display deep ultraviolet (UV) cut-off edges of ∼195 nm and ∼193 nm. The three-dimensional (3D) structure of Al3P6O19.5 is formed by [Al2O9] dimers connected with six PO4 tetrahedra, and one PO4 tetrahedron linked three [Al2O9] dimers alternately. Importantly, Ca[HPO3] shows a moderate second harmonic generation (SHG) effect with a short UV cut-off edge of ∼192 nm in the deep-UV region. The syntheses and topological structures of Al[P2O3(OH)3](H2O), Al[(HPO3)(OH)(H2O)], Ca[HPO3] and Al3P6O19.5, together with some related properties, such as nonlinear optical (NLO) properties, elemental analysis, thermal stability, infrared spectroscopy, Raman spectroscopy and UV-vis diffuse reflectance spectroscopy, are also discussed. [ABSTRACT FROM AUTHOR]

Two novel alkali metal aluminophosphates, namely, Li3[Al(PO4)2(H2O)1.5] and Na[AlP2O7], were synthesized through low-temperature flux methods. They crystallized in the P4 and C2/c space groups, respectively. Both structures of Li3[Al(PO4)2(H2O)1.5] and Na[AlP2O7] were built up by AlO6 octahedra and PO4 tetrahedra. The structure of Li3[Al(PO4)2(H2O)1.5] was composed of novel two-dimensional (2D) aluminophosphate layers, which contained two types of eight-membered rings (8-MRs) along the c-axis. The structure of Na[AlP2O7] featured a unique 3D anionic framework composed of corner-sharing isolated AlO6 octahedra and PO4 tetrahedra. Three intersecting tunnels along the [001], [110], and [101] directions could be observed. Importantly, the material Li3[Al(PO4)2(H2O)1.5] crystallized in the polar space group P4, showing a moderate second-harmonic generation (SHG) effect. Moreover, Na[AlP2O7] exhibited a wide transparency range with a short ultraviolet (UV) cut-off edge (∼190 nm), which indicated its potential application in the deep-UV region. Herein, the syntheses and topological structures of Li3[Al(PO4)2(H2O)1.5] and Na[AlP2O7], as well as elemental analysis, thermal stability, infrared spectroscopy, UV-vis diffuse reflectance, structural properties, and nonlinear optical (NLO) properties are also discussed. [ABSTRACT FROM AUTHOR]

Crystals of three novel highly porous aluminophosphates, namely, α-NaAlPO4(OH) (1), β-NaAlPO4(OH) (2) and Al3.5P5.5O19 (3), were synthesized through mild hydrothermal methods. Interestingly, among these three porous aluminophosphates, 1 is polar, whereas the other compounds are nonpolar and centrosymmetric. The 3D framework structure of 1 is built from AlO6 octahedra and isolated PO4 tetrahedra. 1D Al-chains are linked by PO4 tetrahedra via sharing corners, forming the 3D framework, and 1D 8-membered ring (MR) tunnels were observed along the c-axis. Importantly, the material of 1 exhibits a moderate second harmonic generation (SHG) effect. 2 features a unique 3D anionic framework composed of corner-sharing [Al2O11] dimers and isolated PO4 tetrahedra. Three intersecting tunnels along the axes can be observed; the small tunnels along the c-axis are based on 4-MRs, whereas the two 6-MRs are along the a- and b-axes. The structure of 3 displays a unique 3D framework based upon face-sharing [Al2O9] dimers and isolated PO4 tetrahedra. The small tunnels along the a- and b-axes are based upon 4-MRs, whereas the 1D larger tunnels are based on 12-MRs along the c-axis. Here, the syntheses and topological structures of α-NaAlPO4(OH) (1), β-NaAlPO4(OH) (2) and Al3.5P5.5O19 (3) as well as their elemental analysis, thermal stability, infrared spectroscopy, UV-vis diffuse reflectance and nonlinear optical (NLO) properties are also reported. [ABSTRACT FROM AUTHOR]

Investigation of the Pt-B-O system reveals the first magnesium platinum borate Mg 3 Pt(BO 3) 2 O 2 obtained from the high temperature flux method. The compound crystallizes in the centrosymmetric monoclinic space group C 2/ m (no. 12) with the lattice parameters of a = 16.8073(8) Å, b = 3.10610(1) Å, c = 5.2107(2) Å, and β = 90.546(4)° (Z = 2). The crystal structure of Mg 3 Pt(BO 3) 2 O 2 is based upon isolated BO 3 triangles and PtO 6 and MgO 6 octahedra. The PtO 6 octahedra are connected with each other in an edge-sharing manner forming one dimensional (1D) chains. Each of the PtO 6 octahedra links with two BO 3 units to form anionic [Pt(BO 3) 2 O 2 6- chains along the b -axis. MgO 6 octahedra are arranged in the form of two dimensional (2D) layers. The 2D MgO 6 layers are further connected by the anionic [Pt(BO 3) 2 O 2 6- chains into the 3D framework structure of Mg 3 Pt(BO 3) 2 O 2. The material was experimentally and theoretically characterized in regards to its optical and spectroscopic properties. The first HT platinum borate was experimentally and theoretically characterized in regards to its optical and spectroscopic properties. Image 1 • The first HT platinum borate Mg 3 Pt(BO 3) 2 O 2 was synthesized by high temperature flux method. • The structure was determined by single-crystal X-ray diffraction. • The novel structural chemistry and comparison with related phases were discussed in detail. • Optical properties of the new phase was experimentally and theoretically studied detailly. [ABSTRACT FROM AUTHOR]