Synthesis and structural characterization of the arylindium halides, (C 6H 5) nInX 3− n (X = Cl, Br, I)

Abstract

The complete series of arylindium halides, (C 6H 5) n InX 3− n ( n = 1, 2; X = Cl, Br, I), have been prepared using previously unreported oxidative arylation of the indium(I) halide with various mercurials, and also several published routes. Infrared and Raman spectroscopy, 115In nuclear quadrupole resonance spectroscopy, mass spectrometry and conductivity data were gathered for the purpose of structural characterization in the solid state. The compounds of stoichiometry (C 6H 5) 2InX (X = Cl, Br, I) have best described as adopting a polymeric lattice with multiply-associated halogen atoms linking together nearly linear (C 6H 5) 2In groups. The compounds C 6H 5InX 2 also adopt the polymeric lattice when X = Cl, Br, but C 6H 5InI 2 is more consistent with the associated ionic formulation, (C 6H 5) 2In +InI 4 −. The dioxanate complexes, (C 6H 5) n InCl 3− n dioxane ( n = 0–3), do not contain multiply-associated chlorine atoms and aid in the characterization of the base-free compounds. The polymeric structures of the arylindium halides are more comparable to the structures of the arylthallium halides than to the arylgallium halides.