par Gielen, Marcel ;Nasielski, Jacques
Référence Bulletin des Sociétés chimiques belges, 77, 1-2, page (5-14)
Publication Publié, 1968
Article révisé par les pairs
Résumé : The mass spectra of a series of aryltrimethyltins are described and analysed. The main features are: a relatively weak molecular ion, a very important ArSnMe2 + ion (base peak), a low intensity ArSnMe+ fragment and a non negligible ArSn+ peak. These findings may be related to the well known stable valence states of tin (IVSn and IISn) and the unfavourable IIISn and ISn states. Whereas a methyl group is easier to cleave from the ArSnMe3 + ion than the phenyl radical, n‐butyl seems to be more strongly bound to the metal than the aryl moiety in ArSnnBu3 +. The spectra of three aryltrimethylsilicons, recorded in the same conditions, show stronger molecular ions and weaker divalent fragments than in the corresponding tin derivatives. An interpretation of these various findings is attempted in terms of bond energies and electron delocalization. Copyright © 1968 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim