A comparative study of some molecular addition compounds of group IIIB elements. Part II. The metal–sulphur bond in some addition compounds of aluminium and gallium trihalides with organic sulphides

Abstract

The complexes L,AlCl₃(L = Me₂S, Et₂S, C₄H₈S); 2L,AlCl₃(L = Me₂S and C₄H₈S); L,GaCl₃(L = Me₂S, Et₂S, C₄H₈S, and Ph₂S) have been prepared and characterised by m.p.–composition phase diagrams and have, together with the previously reported complex Et₂S,AlBr₃, been investigated by the techniques of reaction calorimetry, vapour-pressure measurements, and infrared and nuclear magnetic resonance spectra. The relative donor strengths of ether and sulphide ligands to AlX₃ and GaX₃ as acceptors are discussed in terms of π-bonding and polarisability of the ligands.