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Three new group IIIA metal phosphate–oxalate (MPO) compounds, namely [(CH3)2NH2]2[M2(HPO4)2(H2PO4)2(C2O4)] (M = Al (1), Ga (2)) and [(CH3)2NH2]2[In2(HPO4)2(H2PO4)2(C2O4)]·H2O (3), have been synthesized. Their crystal structures feature an anionic layer with the sql topology net. In particular, 1 displays a proton conductivity (σ) of 9.09 × 10−3 S cm−1 at 85 °C and under 98% relative humidity, which is the highest among MPOs. This study not only endows the main group metal-based MPO family with new members, but also contributes to further understanding of the structure-directing roles of amines and provides a feasible idea for improving the proton conductivity of MPOs. [ABSTRACT FROM AUTHOR]

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Abstract: Two new Dawson-based phosphotungstates (H2en)0.5H[Cu(en)2(H2O)]2{[Cu(en)2](α 1-P2W17CuO61)}·8H2O (1) (en=ethylenediamine) and [4,4′-H2bpy]2{[Cu(4,4′-bpy)3][Cu(4,4′-bpy)4(H2O)2]2[Cu(4,4′-bpy)][α-P2W18O62]2}·6H2O (2) (4,4′-bpy=4,4′-bipyridine) have been hydrothermally synthesized and structurally characterized. 1 crystallizes in the triclinic space group P−1 with a=11.7626(17), b=13.246(2), c=29.350(5)Å, α=87.355(5), β=79.583(5), γ=66.993(3)°, V=4138.3(11)Å3, Z=2, GOF=1.089, R 1=0.0563 and wR 2=0.1505, whereas 2 belongs to the orthorhombic space group Iba2 with a=22.277(8), b=47.04(2), c=22.153(8)Å, V=23215(17)Å3, Z=4, GOF=1.051, R 1=0.0627 and wR 2=0.1477. 1 consists of a 1-D linear chain structure constructed from monocopperII-substituted Dawson polyoxoanions, while 2 represents the first 2-D sheet-like structure with a (4,4)-connected topological net built up from plenary Dawson-type polyoxoanions and CuII-4,4′-bpy complex cations in polyoxometalate chemistry. [Copyright &y& Elsevier]

Abstract: Three inorganic–organic composite sandwich-type phosphotungstates [Ni(tepa)(H2O)]4H2[Ni4(H2O)2(α-B-PW9O34)2]·8H2O (1), (enH2)3[Ni2(H2O)10][Ni4(H2O)2(α-B-PW9O34)2]·en·8H2O (2) and (enH2)10[Mn4(H2O)2(α-B-PW9O34)2]2·20H2O (3) (tepa=tetraethylenepentamine and en=ethylenediamine) have been synthesized by the hydrothermal reaction of the trivacant Keggin polyoxoanion [α-A-PW9O34]9− with Ni2+ or Mn2+ ions in the presence of tepa or en and structurally characterized by IR spectra, elemental analysis, thermogravimetric analysis and variable temperature magnetic susceptibility. X-ray crystallographic analyses indicate that they all contain the classical tetra-M sandwiched polyoxoanions [M 4(H2O)2(α-B-PW9O34)2]10− (M=Ni2+ or Mn2+) and nickel-organoamine cations or organoamine cations work as the charge balance ions. The tetra-M clusters in 1, 2 and 3 exhibit the familiar structural type of a β-junction at the sites of metal incorporation. The study of magnetic property of 1 is indicative of a typical ferromagnetic coupling between Ni2+ cations. [Copyright &y& Elsevier]

Abstract: Three novel hetero-polyoxovanadates, [Cd(2,2′-bpy)3]{[Cd(dien)]As8V14O42(H2O)} (1, 2,2′-bpy=2,2′-bipyridine, and dien=diethylenetriamine), [Zn(2,2′-bpy)2]2[As8V14O42(H2O)]·H2O (2) and [Ni(en)2]3[As8V14O42(HPO3)]·4H2O (3, en=ethlenediamine), were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Crystal data: 1 monoclinic, P2(1)/n, , , , , Z=4. 2, orthorhombic, P2(1)2(1)2(1), , , , . 3, triclinic, , , , , , , , . Compounds 1–3 are all made of the {As8V14O42} shells linked by corresponding transition metal complexes into extended structures. Compound 1 and 2 present 1-D wave-like and tubular structures, respectively, while compound 3 exhibits a novel 2-D structure containing interwinding puckery layers. Variable temperature susceptibility measurements demonstrate the presence of antiferromagnetic interaction between VIV cations in 1 and 2. [Copyright &y& Elsevier]

A tin(ii) tungstosilicate derivative K11H[Sn4(SiW9O34)2]·25H2O with four sandwiched Sn2+cations was prepared by reaction of SnCl2, KCl and Na10[α-SiW9O34]·xH2O. Visible-light photocatalytic H2evolution activity was observed with Pt nanoparticles as co-catalyst and methanol as sacrificial agent. [ABSTRACT FROM AUTHOR]

The title compound, butyl­ammonium 1,3,5,7,9,11-hexa­oxa-2,4,6,8,10-penta­boraspiro­[5.5]undecane-2,4,8,10-tetraol(1−), C4H12N+·B5O6(OH)4−, was synthesized under mild solvothermal conditions in the presence of 1-butyl­amine acting as a template. The structure consists of penta­borate [B5O6(OH)4]− anions connected through O—H⋯O hydrogen bonds into a three-dimensional framework, with channels running along one direction. The [C4H12N]+ cations lie in the channels, inter­acting with the framework through N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]