Mass spectra of organo-stannanes and -plumbanes

Abstract

The fragmentation behaviour of organostannanes [SnPh_nEt_4–n(n= 0–4), SnPh₃(CH₂·CH₂·Ph), spiro-[CH₂]₄ > Sn < [CH₂]₄, SnPh₃X (X = F, Cl, Br, or I), Sn₂R₆(R = Et, Ph)], organoplumbanes (PbEt₄, PbPh₄), and Ph₄C have been examined under high resolution at 70 eV. Parent ions are always of low abundance and decompose mainly by elimination of an odd-electron neutral fragment, whereas MR₃⁺ ions are of high abundance and lose even-electron fragments. Most of the ion current is carried by metal-containing species. Appearance-potential measurements on organostannanes have been used to evaluate dissociation-energy differences and dissociation energies in molecular ions.