Use of the metal-isotope technique (tin-116 and -124) to confirm assignments in the vibrational spectra of phenyltin compounds

Abstract

Samples of isotopically pure (¹¹⁶Sn and ¹²⁴Sn) tetraphenyltin, triphenyltin iodide, and triphenyltin acetate have been prepared and their i.r. spectra recorded. Shifts of bands corresponding to metal-sensrtive vibrations of the order of 5 cm^–1 have been observed. In this way the results of earlier empirical studies are shown to be broadly correct but some assignments need modification. It is noted that the term ‘tin–phenyl stretch’ has physical significance.