Mössbauer studies of complexes of diorganotin diisothiocyanates with tridentate ligands

Mössbauer and infrared spectra have been obtained for terpyridylcomplexes of dimethyl-, di-n-butyl- and diphenyltindiisothiocyanates and the correspondingR₂Sn(NCS)·terpyridyl]⁺ BPh₄]- compounds, and for the8-(2-pyridylmethylene-amino)quinoline, PMAQ, complexes withdi-n-butyl- and diphenyltin diisothiocyanates. Infrared spectra ofthe neutral complexes indicate seven-coordination for tin and theMössbauer parameters indicate axial C Sn bondshaving a greater tin s-character than in trans octahedralcomplexes. The largest quadrupole splitting, 4.73 mm/sec, wasobtained for the terpyridyl complex with di-n-butyltindiisothiocyanate.