CYCLOOLIGOSILOXANOLATE CLUSTER COMPLEXES OF TRANSITION-METALS AND LANTHANIDES

Cyclooligosiloxanolate complexes of higher valent transition metals an d lanthanides were synthesized and characterized by single-crystal X-r ay diffraction experiments, spectra, cyclic voltammetry, conductivity and magnetic behaviour. These complexes are sandwich-type clusters con taining assemblies of 4 to 8 metals between siloxanolate ligand 'layer s'. A high degree of electron delocalization in the metal containing f ragment of these complexes is detected by electrochemical and magnetic measurements, The synthesis, crystal and molecular structure determin ed by X-ray diffraction of Na-6{[C6H5SiO2)(8)]Gd-2(4)(mu(4)-O)} is rep orted.