Transition metal clusters as precursors for hybrid materials


Christiane PERRIN

Université de Rennes 1, Sciences Chimiques de Rennes, UMR CNRS 6226

Avenue du Général Leclerc, 35042 Rennes cedex (France)

 Early transition metal cluster compounds with metal-metal bonds, built from octahedral face-capped M6Li8La6 (M = transition metal; L = halogen and/or chalcogen; i = inner; a = apical) cluster units, are found in low oxidation states of molybdenum and rhenium chemistry. They are prepared by solid state chemistry at high temperature and exhibit a great numbers of architectures due to the various types of connections that can be built between the M6Li8La6 building blocks. Some of these compounds are soluble in organic solvents giving access to discrete M6Li8La6 cluster units and they constitute relevant precursors for elaboration of hybrid organic/inorganic materials by soft chemistry techniques. Indeed, the M6Li8 cluster core constitutes a rigid block, while the apical ligands are more labile that allows the exchange of these L a ligands for organic or organometallic ones. Various examples of metathesis or ligand exchange will be presented, giving access for instance to hybrid organic/inorganic compounds, hybrid nanoobjects, cluster-dendrimer assemblings, functionalized surfaces, luminescent silicate nanoparticules in which the physical properties of the cluster units are maintained.