The physical chemistry of organotin compounds: Part III. The ultraviolet spectra of some aryltin compounds

Abstract

The ultraviolet spectra of tetrabenzyltin, tribenzyltin chloride, triethyltin phenoxide, tetra- p-tolyltin and tetrakis- p-chlorophenyltin were determined in both cyclohexane and chloroform solutions. The vibrational fine structures were analysed. The spectrum of tribenzyltin chloride in cyclohexane and chloroform solutions indicates photodecomposition of the compound with possible limit at 2100 A in cyclohexane solution. The spectrum of tetrabenzyltin indicates that the methylene group, although shielding the tin atom from the mesomeric effect of the phenyl group, the inductive effect of the tin atom is still effective. The empty d-orbital of tin in triethyltin phenoxide seems to provide for the extension of the mesomeric effect of the π-electronic cloud of the phenyl group through the p-electrons of the oxygen atom. The spectra of tetra- p-tolyltin and tetrakis- p-chlorophenyltin provide evidence for electronic interaction between the tin atom and the p-substituent on the benzene nucleus, more so in the former than in the latter compound.