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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]