Mössbauer study of the solid state configuration of trioganotin derivatives with intramolecular coordination

Abstract

Triorganotin bromides with intramolecular nitrogen-to-tin coordination (I-VIII, Fig. 1) have been structurally investigated by Mossbauer and infrared spectroscopy. Mossbauer-Zeeman spectra have been measured for I and VIII in order to obtain the sign of the nuclear quadrupole splitting @DE and the value of the asymmetry parameter @h. Point-charge model values of @DE and @h have been calculated for environments of tin atoms in I-VIII which are plausible in view of the results of previous investigations. From trends of experimental @DE in the series, and from the agreement between experimental and calculated Mossbauer parameters it is concluded that the compounds I-VIII all have trigonal bipyramidal structures with equatorial SnC{3} skeletons. In compound VIII only one of the two Me{2}NCH{2} ligands intramolecularly coordinates to tin similar to the situation observed for VIII in solution at low temperature.