Two organic-inorganic hybrids based on polyoxometalates: synthesis, crystal structure, and characterization.

Yao, Feng; Meng, Fan-Xia; Chen, Ya-Guang; Zhang, Chun-Jing

Two new Keggin- and Wells-Dawson-type polyoxometalate-based organic-inorganic hybrid copper-organonitrogen complexes have been synthesized under hydrothermal conditions: [CuI(4,4'-bpy)]2[H2SiW12O40] ⋅ 2H2O (4,4'-bpy = 4,4'-bipyridine) (1) and [image omitted] (en =ethylenediamine), and characterized by elemental analysis, IR spectra, TGA, XRD, and single crystal X-ray diffraction. In 1, [Cu(4,4'-bpy)] cations form polymeric chains [image omitted] and a weak Cu-O linkage makes the anions situate between two chains, forming an infinite 1-D ladder-chain structure. Such 1-D ladder-chains are further interconnected via hydrogen bonding into a 3-D supramolecular framework. Compound 2 with covalently bonded 3-D structure consists of saturated Wells-Dawson tungstoarsenate polyoxoanions and copper complexes with two types (rigid and flexible) of ligands. The polyoxoanion has the highest connectivity for Wells-Dawson tungstoarsenate polyoxoanion coordination polymers to date. XPS spectra indicate that three W atoms in the Dawson unit were reduced and that there coexist CuI and CuII in 2.

ORGANIC compounds; INORGANIC compounds; POLYOXOMETALATES; ARSENATES; BIPYRIDINE; SUPRAMOLECULAR chemistry

Journal of Coordination Chemistry, 2010, Vol 63, Issue 2, p196

0095-8972

Academic Journal

10.1080/00958970903377287