INOR 2 |
| Polyoxometalates are interesting components for the preparation of conducting and magnetic molecular materials for the following main characteristics (i) their geometrical parameters (size and shape) can influence the dimensionality of the target materials, (ii) the high negative electronic charge can give rise to strong electrostatic interactions between the organic and inorganic networks, (iii) the presence of transition metals gives a flexibility because it is possible to introduce paramagnetic centers and also to modulate their geometrical and electronic properties, thanks to the coordination chemistry, by changing the ligand on the metal, (iv) these large units are soluble and stable in organic solvent (CH3CN, CH2Cl2, etc) which makes possible their molecular assemblies with organic and organometallic radical cations. Finally, the polyoxometalates are good inorganic electron acceptors and this offers the opportunity to prepare organic donor - inorganic acceptor materials with a mixed valence state on the organic and inorganic units. The potentialities of these molecular metal oxide clusters are illustrated through some examples of organic/inorganic hybrid compounds resulting from their chemical or electrochemical molecular assemblies with organic donors derived from TTF as well as nitronyl nitroxide radicals and organometallic decamethylferrocenium radicals (Fe(Cp*)2+ [1-4]. 1.- L. Ouahab Chem. Mat., 1997, 9, 1909 2.- L. Ouahab, C.R. Acad. Sci. Paris, 1998, serie IIC, t1, 369 3.- L. Ouahab, Coord. Chem. Rev, 1998, 180, 1495 4.- L. Ouahab et al. in Polyoxometalates Chemistry : From Topology via Self-Assembly to Applications, Kluwer Academic Publisher, Elsevier, 2000, 205. |
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Polyoxometalates and Related Clusters in Chemistry and Nanoscience
9:00 AM-12:30 PM, Sunday, August 19, 2007 BCEC -- 204 A/B, Oral
Division of Inorganic Chemistry |