Synthesis and characterization of diorganotin(IV) complexes of tetradentate Schiff bases: crystal structure of n-Bu2Sn(Vanophen)

Diorganotin(IV) complexes of the general formula R2SnL (R=Ph, n-Bu and Me) have been prepared from diorganotin(IV) dichlorides (R2SnCl2) acid tetraden tate Schiff bases (H2L) containing N2O2 donor atoms in the presence of trie thylamine in benzene. The Schiff bases, H2L, were derived from salicylaldeh yde, 3-methoxysalicylaldehyde (o-vanillin), 1-phenyl-3-methyl-4-benzoyl-5-p yrazolone and diamines such as o-phenylenediamine and 1,3-propylenediamine. The complexes were characterized by IR, NMR (H-1, C-13, Sn-119) and elemen tal analysis. The structure of the complex, n-Bu2Sn(Vanophen), was determin ed using single crystal X-ray diffraction, The tin atom has a distorted oct ahedral coordination, with the Vanophen ligand occupying the four equatoria l positions and the n-butyl groups in the trans axial positions, Six-coordi nated distorted octahedral structures have been proposed for all diorganoti n(IV) complexes studied here, as they possess similar spectroscopic data. ( C) 1994 Elsevier Science Ltd. All rights reserved.