Gallium(III) and indium(III) complexes of cross-bridged tetraamine ligands

Gallium(III) and indium(III) complexes of cross-bridged cyclam and cyclen tetraaza macrocyclic ligands have been prepared and structurally characterized. In the crystalline state, both the <f>GaCl3</f> (cross-bridged cyclam) and <f>InBr3</f> (cross-bridged cyclen) complexes feature hexacoordinate cations in cis-folded tetradentate ligand clefts with ancillary cis-dihalides. These represent the first well-characterized gallium and indium halide complexes of tetraazamacrocycles. [Copyright &y& Elsevier]