Synthesis and spectroscopic studies of new organotin(IV) complexes with tridentate N- and O-donor Schiff bases

Abstract

The Schiff bases H2L1 and H2L2 have been prepared by the reaction of 2-amino-4-chlorophenol with pyrrole-2-carbaldehyde and 2-hydroxy-1-naphtaldehyde, respectively, and HL3 from reaction of 2-(aminomethyl)pyridine with 2-hydroxy-1-naphtaldehyde. Organotin complexes [SnPh2(L1)] (1), [SnPh2(L2)] (2), [SnMe2(L2)] (3) and [SnPhCl2(L3)] (4) were synthesized from reaction of SnPh2Cl2 and SnMe2Cl2 with these Schiff bases. The synthesized complexes have been investigated by elemental analysis and FT-IR, 1H NMR and 119Sn NMR spectroscopy. In complexes the Schiff bases are completely deprotonated and coordinated to tin as tridentate ligands via phenolic oxygen, pyrrolic, and imine nitrogens in 1, two phenolic oxygens and imine nitrogen in 2 and 3, and phenolic oxygen, imine and pyridine nitrogens in 4. The coordination number of tin in 1, 2, and 3 is five and in 4 is six.