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Abstract: Two new compounds based on Weakley-sandwich-type polyanion (WSP), H2[Mn(en)2]2[Mn(en)2(H2O)]2[Mn4(H2O)2(PW9O34)2]·9H2O (1) and Na2[Co(en)2]2[{Co(en)2(H2O)]2[Co4(H2O)2(PW9O34)2]·9H2O (2) (en=ethylenediamine), have been synthesized by the hydrothermal reaction of the trivacant Keggin polyoxoanion [a-A-PW9O34]9− with transition metal ions and en, and structurally characterized by routine physical methods and single-crystal X-ray diffraction. Compound 1 represents a 1D chain structure made up of WSPs and [Mn(en)2]2+ ions. Compound 2 represents a 2D layer structure formed by the interconnection of WSPs, [Co(en)2]2+ and Na+ ions. Compounds 1 and 2 represent the first example of high-dimensional construction based on WSPs and transition metal complexes (TMCs), in which the water molecules located on the featured tetra-metal unit are still remained, and exhibit the property of sorption/desorption of water molecules. [Copyright &y& Elsevier]

Abstract: A novel one-dimensional Wells–Dawson-based compound H2(bbi)0.5[Ni(phen)(bbi)2]2[P2W18O62] (phen=1,10′-phenanthroline, bbi=1,1′-(1,4-butanediyl)bis(imidazole)), has been prepared under the hydrothermal conditions and structurally characterized by elemental analysis, cyclic voltammetry, IR and XPS spectra and single-crystal X-ray diffraction. The title compound exhibits an interesting wavelike chain constructed from Dawson type polyoxoanion and mixed rigid and flexible ligands decorated [Ni(phen)(bbi)2]2+ cationic complex. It represents the first example of polyoxometalate that built from the rigid and flexible ligands at the same time. [Copyright &y& Elsevier]

Three inorganic-organic hybrid complexes, [Cu(Hbiim)(OH)](SiWO)·2HO ( 1), [Cu(Hbiim)](SiWO)·2HO ( 2) and [Ag(Hbiim)](SiWO)·2HO ( 3) (Hbiim = 2, 2′-biimidazole), have been synthesized under hydrothermal conditions, and characterized by elemental analysis, IR, PXRD, TG and single-crystal X-ray diffraction. The crystallographic analysis reveals that in compounds 1- 3, the Keggin polyanions [ α-SiWO] act as inorganic building blocks, which are linked with the dinuclear metal-organic units via Cu-O bonds in compound 1, or through supramolecular interactions in compounds 2 and 3. Compound 1 shows a 3D supramolecular structure constructed by net-like layers. Compounds 2 and 3 display 2D layer structures which were composed of wave-like chains. In addition, these compounds show electrochemical activities, and photoluminescence properties are measured in the solid state. [ABSTRACT FROM AUTHOR]

The first example of one-dimensional organic–inorganic polymetallic coordination polymer based on heptamolybdate anions, formulated (NH4)[Cu(en)2][Na(en)Cu(en)2(H2O)(Mo7O24)] · 4H2O (en = ethylenediamine) (1) has been hydrothermally synthesized and characterized by element analysis, IR, EPR, CV and single crystal X-ray diffraction. The structure of 1 is fabricated by self-assembly of integrated heptamolybdic anions without collapse of primary structure and copper-ethylenediamine(en) coordination groups into one-dimensional zigzag-shaped chains. [Copyright &y& Elsevier]

Abstract: A new inorganic–organic hybrid compound constructed from Keggin-type polyoxometalate and cadmium-organic units, namely, [Cd(Htrz)3]2[SiW12O40]·2H2O (1), [Htrz=1-H-1,2,4-triazole], has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR, TG, and UV–vis absorption spectra. In compound 1, each [SiW12O40]4− cluster is modified by six [Cd(Htrz)3]2+ metal–organic fragments, meanwhile, each [Cd(Htrz)3]2+ also connects with three [SiW12O40]4− to built up a binodal (3,6)-connected 2D planar network with the (43)2(46·66·83)-kgd topology. Interestingly, [SiW12O40]4− cluster exhibits a rare coordination mode acting as a hexadentate ligand, in which all of the six terminal oxygen atoms in the equatorial plane are synchronously participated in coordination. The diffuse reflectivity spectrum shows it can be regarded as a wide gap semiconductor. Moreover, the photocatalytic performance shows good photocatalytic activity for the degradation of Rhodamine B. [Copyright &y& Elsevier]