Infrared spectra and structure of phosphine and substituted phosphine complexes of gallium trihalides

Abstract

Eight 1:1 adducts of the gallium trihalides with phosphine, trimethylphosphine, and triphenylphosphine have been prepared and their far-infrared spectra (20–450 cm.^–1) recorded. The gallium halides bands exhibit characteristic group frequencies in this region and the results have been interpreted in terms of a monomeric structure L→GaX₃ with C_3v symmetry about the gallium atom. The positions of the P–Ga bond vibrations have been located in some cases but there is no direct correlation between these positions and the strengths of the metal–ligand bonds.