Syntheses, structures and properties of three neutral bisupporting heteropolyoxometalates.

Liu, Hong-Bo; Sun, Yu; Chen, Ya-Guang; Meng, Fan-Xia; Shi, Dong-Mei

Three neutral polyoxometalates [PVW11O40{M(phen)2H2O}2] · 3H2O (phen = 1,10'-phenanthroline, M=Co 1, Zn 2, Ni 3) are composed of water and the neutral Keggin-type polyoxometallate covalently linking a pair of transition metal complex fragments on opposite sides. The transition metal lies in the center of a distorted octahedron. Multi hydrogen-bonding interactions between coordinated waters of neutral polyoxometalate molecules and terminal oxygen atoms of Keggin units and between bridging oxygens of Keggin units and lattice water create a two dimensional layer and between the layers there exist van der Waals forces. The framework of the neutral molecule begins to decompose at ca 500°C. Compound 1 exhibits a weak antiferromagnetic interaction in the 2-300 K range.

POLYOXOMETALATES; COORDINATION compounds; METALLIC oxides; TRANSITION metals; THERMAL analysis

Journal of Coordination Chemistry, 2008, Vol 61, Issue 19, p3102

0095-8972

Academic Journal

10.1080/00958970802001780