Synthesis and structures of some diethyl- and diphenyltin bishydroxamates

Abstract Diethyl- and diphenyltin derivatives of N -methyl- N - p -bromobenzoylhydroxylamineR 2 Sn{ON)C 6 H 4 Br- p )C(O)C 6 H 4 Br- p } 2 , R=Et, Ph, and N - p -bromophenyl- N - p -bromobenzoylhydroxylamine, R 2 ,Sn{ON(C 6 H 4 Br- p )C(O)C 6 H 4 Br- p } 2 , R = Et, Ph, were made and characterized by IR, Mossbauer and NMR ( 1 H, 13 C, 119 Sn) spectroscopy and, in the case of Et Pin 2Sn{ON(Me)C(O)C 6 H 4 Br- p } 2 , by an X-ray diffraction study. The geometry at the tin atom is that of a distorted trans octahedron with two bidentate, nearly equivalent, N -acylhydroxylamine residues and a CSnC angle of 141.1°. On the basis of the Mossbauer data for the diphenyltin hydroxamates, a cis -octahedral structure with bidentate ligation of the hydroxylamine residues is suggested.