Co-ordination compounds of indium. Part 38. Complexes of indium(I) and indium(III) with macrocyclic ligands

Abstract

The macrocycles 6,7,9,10,17,18,20,21-octahydrodibenzo[b,k][1,4,7,10,13,16]hexaoxacyclo-octadecin (dibenzo-18-crown-6) and 1,4,8,11-tetra-azacyclotetradecane (cyclam) form adducts with InX₂ and InX₃, but not with InX (X = Cl, Br, or I). Vibrational spectroscopy shows that the product In₂X₄L (L = macrocycle) should be formulated as [InL][InX₄]. With InX₃ and dibenzo-18-crown-6, the spectra reveal the presence of InX₄^– anions and linear InX₂⁺ species, which may be part of either a mononuclear or polynuclear complex cation. The reaction of cyclam and InX₃ yields products formulated as [In(cyclam)₂][InX₄]₃.