Two new hybrid architectures based on polyoxometaloborates and imidazole fragments

Abstract

Two new hybrid compounds based on polyoxometaloborates, (HIm) 12[MnBW11O39H]2·13H2O (1) and (HIm)(Im)[(Im)4Zn]2[BW12O40] ·2H2O(2) (Im = imidazole), have been synthesized and characterized by elemental analyses, IR, UV, TG, and single-crystal X-ray diffraction. Compound 1 is made up of [MnBW11O39H] 6- polyoxoanions, which are coordinatively linked together by terminal oxygen atoms to yield an unprecedented one-dimensional chain that represents the first example of one-dimensional assemblies based on polyoxotungstoborates and transition metal cations. Adjacent inorganic chains are further in close contact by imidazole molecules to form a three-dimensional supramolecular channel framework by strong hydrogen-bonding interactions. Compound 2 exhibits a three-dimensional supramolecular architecture constructed from Keggin-type polyoxoanions [BW12O40]5- and zinc-imidazole coordination units by strong hydrogen-bonding interactions. Furthermore, both compounds exhibit interesting photoluminescence properties at room temperature. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.