Syntheses, characterizations and crystal structures of new organotin complexes with 2-mercapto-6-nitrobenzothiazole

Abstract

A series of organotin(IV) complexes with 2-mercapto-6-nitrobenzothiazole (HMNBT) of the type, [R n Sn(MNBT) 4 − n ] ( n=2, R=Me, 4; n=3, R=Me, 5; n-Bu, 6; Ph, 7; PhCH 2, 8) were synthesized. All the complexes 4– 8 have been characterized by elemental, IR and 1H NMR analyses. Among them, complexes 4, 7 and 8 were also characterized by X-ray crystallography diffraction analyses, which revealed that the structures of both complexes 7 and 8 are penta-coordinated with R 3Sn coordinated to the thiol S and heterocyclic N atoms, and the structural distortion for each is a displacement from tetragonal towards trigonal bipyramidal geometry. For complex 4, the geometry of the center tin atom is a distorted trapezoidal bipyramid. Besides, intermolecular S⋯S and Sn⋯S non-bonded interactions were recognized in crystal structures of complexes 4 and 7, respectively. The IR and 1H NMR spectral data indicate such an inclination that those structures of trialkyltin derivatives are apt to be penta-coordinated and those dialkyltin derivatives are likely in six-coordination.