Synthesis and spectroscopic properties of [ N-(4-carboxyphenyl) salicylideneiminato] di- and tri-organotin (IV) complexes and crystal structures of {[ nBu 2Sn(2-OHC 6H 4CH [dbnd]NC 6H 4COO)] 2O} 2 and Ph 3Sn(2-OHC 6H 4CH [dbnd]NC 6H 4COO)

Abstract

Reactions of R 2SnO (R: n Bu, Cy, Ph, PhCH 2) and R 3SnCl (R: Ph, Cy, PhCH 2, 2- Cl-PhCH 2, 4- F-PhCH 2, 4- Cl-PhCH 2) with N-(4-carboxyphenyl)-salicylideneimine (LH 2) in 1:1 stoichiometry afford complexes {[R 2Sn(LH)] 2O} 2 and R 3Sn(LH). These complexes have been characterized by elemental analyses, IR, 1H and 119Sn NMR spectroscopy. The crystal structures of {[ n Bu 2Sn(LH)] 2O} 2, 1 and Ph 3Sn(L), 5 are determined by single crystal X-ray diffraction. Results showed that in the solid state the complex 1 is a tetranuclear centrosymmetric dimer with six-coordination being assigned to both the endo-cyclic and exo-cyclic tin atoms after consideration of close intermolecular tin oxygen contacts, and study show that the imino nitrogen atom do not participate in coordination to the tin atom. The complex 5 is a monomer, and in the molecule the tin atoms are five-coordinated in trigonal bipyramidal geometries with the two oxygen atom of the carboxylate both coordinating to the tin atoms.