Polyoxometalate
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A polyoxometalate (abbreviated POM) is a metallate containing anion or molecule consisting of transition metal ions bonded to other ligands, generally oxygen atoms, though some derivatives might contain nitrogen or sulfur, and generally based upon MoO6 and/or WO6 octahedra (though not exclusively). Several of these POMs are polymeric in nature, while others are discrete anions/molecules The largest of these POM's currently known isolated molybdenum and number up to 368 molybdenum ions and over a 1000 atoms/ions in total. 1 There are also numerous structures of tungsten2 and vanadium, not to mention the large mineral archetypes of the earlier transition metals (eg, rutile, hematite, spinel etc) and their laboratory snythesised analogues,3 along with numerous lanthanide and actinide complexes (often Keggin based).
[edit] References
For a general good overview read
M.T. Pope "Heteropoly and Isopoly Oxometalates", Springer Verlag, New York, (1983).
L. Cronin "High Nuclearity Clusters: Iso and Heteropolyoxoanions and Relatives", Eds., J. A McCleverty, T. J. Meyer, Comprehensive Coordination Chemistry II, Vol. 7, p1- 57, Amsterdam, Elsevier, 2004 , ISBN 0-08-043748-6
[edit] Specific Refences
1. See for example (a) A. Müller, S. Roy; Co-Ord. Chem. Rev., 2003, 245, 153 (b) A. Müller, H. Bögge, M. Henry; C. R. Chimie, 2005, 8, 47.
2. C. L. Hill, ed. "Polyoxometalates", Chem.Rev.,1998, 98, 1
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