Organotin complexes: the acceptor properties of triphenyltin isothiocyanate and diphenyltin di-isothiocyanate and the infrared spectra of complexes containing oxygen donor ligands

Abstract

Triphenyltin isothiocyanate forms 1 : 1 complexes with both monodentate and bidentate ligands. Diphenyltin di-isothiocyanate forms 1 : 1, five-co-ordinate complexes with large monodentate ligands and 1 : 2 complexes with small ligands. Variations in the tin–oxygen stretching frequencies in complexes with pyridine N-oxide indicate an order of acceptor strengths R₂SnX₂ > R₃SnX (R = Ph or Me; X = NCS or Cl), Ph₂SnX₂ > Me₂SnX₂, and Ph₃SnX > Me₃SnX.