Synthesis and characterization of tin(IV)/organotin(IV) complexes with 2-benzoylpyridine-N(4)-cyclohexylthiosemicarbazone [HBPCT]: X-ray crystal structure of [SnCl₃(BPCT)]

Abstract

Four new tin(IV)/organotin(IV) complexes, [SnCl₃(BPCT)] (2), [MeSnCl₂(BPCT)] (3), [Me₂SnCl(BPCT)] (4), and [Ph₂SnCl(BPCT)] (5), have been synthesized by the direct reaction of 2-benzoylpyridine-N(4)-cyclohexylthiosemicarbazone [HBPCT, (1)] and stannic chloride/organotin(IV) chloride(s) in absolute methanol under purified nitrogen. HBPCT and its tin(IV)/organotin(IV) complexes (2–5) were characterized by CHN analyses, molar conductivity, UV-Vis, FT-IR, and ¹H NMR spectral studies. In all the complexes, tin(IV) was coordinated via pyridine-N, azomethine-N, and thiolato-S from 1. The molecular structure of 2 has been determined by X-ray single-crystal diffraction analysis. Complex 2 is a monomer and the central tin(IV) is six-coordinate in a distorted octahedral geometry. The crystal system of 2 is monoclinic with space group P121/n1 and the unit cell dimensions are a = 8.3564(3) Å, b = 23.1321(8) Å, c = 11.9984(4) Å.

Keywords:

• Substituted thiosemicarbazone
• Tin(IV)/organotin(IV) complexes
• Spectral analyses
• Crystal structure

Acknowledgments

This work was financially supported by the Ministry of Science, Technology and Innovation (MOSTI) under research grant (No. 06-01-09-SF0046). The authors thank Universiti Malaysia Sarawak (UNIMAS) for the facilities to carry out the research work. The authors are also grateful to Zultan Gal, Oxford Diffraction Ltd. UK, for the X-ray diffraction analysis.