Silsesquioxane chemistry.: Part 10. Silsesquioxane silanolate complexes of samarium and scandium

Two novel complexes of samarium and scandium containing silsesquioxane silanolate ligands have been synthesized and structurally characterized by X-ray diffraction. Yellow (C5Me5)2Sm[μ-Cy7Si8O12O]2Li(THF) (1, Cy=c-C6H11), the first organolanthanide silsesquioxane complex, has been obtained by treatment of the ‘ate’-complex (C5Me5)2Sm(μ-Cl)2Li(THF)2 with Cy7Si8O12OLi in a molar ratio of 1:2. In heterobimetallic 1 samarium and lithium are bridged by two silsesquioxane silanolate ligands. Reaction of (C5Me5)Sc(acac)2 with two equivalents of Cy7Si8O12OH leads to the closely related binuclear scandium complex [Sc(acac)2(μ-Cy7Si8O12O)]2 (2).