Co-ordination compounds of indium. Part XXII. Anionic complexes derived from the lower halides of indium

Abstract

The halide salts of the dispositive NN′-dimethyl-4,4′-bipyridinium cation (Me₂bipy,X₂; X = Cl, Br, or I) react with indium monohalides to give salts of the trihalogenoindate(I) anions Me₂bipy,InX₃, in which the anion is iso-electronic with SnX₃ ^– and SbX₃. With indium trihalides the products are either Me₂bipy,[InCl₅] or Me₂bipy²⁺+ InX₄ ^–+ X^–(X = Br or I); the InCl₅ ^2– anion has C_4v symmetry in the salt prepared, and this result is discussed in terms of earlier studies of this anion. The indium dihalides yield a mixture of In^I and In^III anions. The Raman spectra are reported for the anionic complexes prepared, for the indium monohalides, and for indium dibromide and di-iodide.