The electrolytic conductance of halogen adducts of the triphenyl derivatives of Group VB elements

Abstract

The conductance of methyl cyanide solutions of triphenyl-phosphine, -arsine, -stibine, and -bismuthine dihalides has been measured, and the molar conductance values are compared. Conductometric titrations of some triphenylphosphine–halogen systems indicate the formation of triphenylphosphine tetrahalides which are strong electrolytes and ionise as halogenotriphenylphosphonium trihalides like their triphenylarsine analogues. Each compound in the series Ph₃Pl_nBr_{4 –n} has been prepared. Tetrahalides of triphenylstibine and -bismuthine could not be prepared, although Ph₃Sbl₄ and Ph₃Sbl₃Br were indicated by conductometric titration.