Electron impact studies on some group III metal alkyls

Abstract

Trimethyl derivatives of the Group III elements (B, Al, Ga, In, and Tl) have been studied mass spectroscopically at low- and high-source temperatures, and a range of electron voltages. Some specimens of Me₃Ga gave a trimeric and dimeric ion (Me₉Ga₃⁺˙, Me₅Ga₂⁺). Trivinylgallium, reported as dimeric in benzene, gave no associated ions. The fragmentation behaviour of these compounds is described and appearance potential measurements are reported for Me₃Ga and (CH₂:CH)₃Ga, from which (Me–Ga)= 55·6 ± 2 kcal mol^–1.