Complexes of a crown ether with gallium(III) iodide and indium(III) iodide

Abstract

The diethyl ether adducts Et₂O·MI₃ (M = Ga or In) have been converted by reaction with the macrocyclic ether 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) into complex ionic products [MI₂(18-crown-6)][MI₄]. Raman and IR spectra yielded the assignments: for [GaI₂]⁺, ν₁ 161; ν₂ 60; ν₃ 313 cm^-1; for [InI₂]⁺, ν₁ 150, ν₂ 46, ν₃ 258 cm^-1. X-Ray analysis of the indium compound as colourless monoclinic crystals revealed a weakly complexed [InI₂]⁺ cation with In–I 2.617(1) and 2.619(1) Å and an I–In–I angle of 170.14(4)° threaded through the cavity of the crown ether, and a distorted tetrahedral [InI₄]^- anion with the average In–I bond length of 2.708(2) Å.

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