Crystallographic studies of diphenylgermanium, diphenyltin and diphenyllead compounds containing the dinegative ligand derived from salicylideneamino-o-hydroxybenzene: Ph2M(OC6H4CH=NC6H4O)

Abstract

The crystal and molecular structures of Ph2M(OC6H4CH=NC6H4O) where M = Ge, Sn, Pb and the dinegative ligand is derived from salicylideneamino-o-hydroxybenzene have been determined. Monomeric species are found for the Ge(IV) and Sn(IV) compounds in which the metal centre exists in a distorted trigonal bipyramidal geometry with the O atoms occupying axial positions. By contrast, intermolecular association is found in the Pb(IV) analogue, presumably reflecting the desire of the larger lead atom to increase its coordination number. Thus, centrosymmetrically related molecules of Ph2Pb(OC6H4CH=NC6H4O) are linked via the O-atoms of the azobenzene portion of the molecule giving rise to a central Ph2..