Synthesis of mixed diaryltin(IV) complexes using an arylmercury compound. Crystal and molecular structure of [Sn (2-C6H4NNPh)(Ph)Cl2]

Abstract

The complex [Sn(2-C₆H₄NNPh)(Ph)Cl₂](1) can be prepared by treating [Sn(Ph)Cl₃] with [Hg-(2-C₆H₄NNPh)₂](1:1). The reactions of (1) with NMe₄Cl (1 : 1) or excess of KX salts give NMe₄[Sn(2-C₆H₄NNPh)(Ph)Cl₃](2) or [Sn(2-C₆H₄NNPh)(Ph)X₂][X = Br (3) or l(4)], respectively. The molecular structure of complex (1) shows a distorted trigonal bipyramidal coordination around the tin atom. The equatorial positions are occupied by both carbon atoms of the aryl ligands and by one of the chloro ligands. The angles in the equatorial plane differ from the 120° ideal value [C–Sn–C 136.2(2)°, Cl-Sn-C 111.4(2) and 106.0(1)°] with the tin atom lying 0.314 Å out of the equatorial plane on the side of the axial Cl atom. The 2-(phenylazo) phenyl ligand forms with the tin atom a five-membered ring with a bite angle C–Sn–N of 70.9(2)°. The Cl–Sn bond distances are normal although the axial [2.415(2)Å] is longer than the equatorial one [2.351(2)Å]. Both C-Sn bond lengths are also normal and similar [2.114(5) and 2.117(5)Å]. The N–Sn bond length [2.541(3)Å] is longer than others reported. To our knowledge, this is the first mixed diaryltin(IV) complex structurally characterized.