Dinuclear Ni(II) and Cu(II) complexes with indolecarboxamide ligand: Synthesis, structure and properties

A potential tetradentate indolecarboxamide ligand shows interesting coordination abilities towards Ni(II) and Cu(II) ions. Two H4L3 ligands in their tetra-deprotonated form [L3]4− were found to symmetrically coordinate two metal centers resulting in the formation of [Ni2(L3)2]4− and [Cu2(L3)2]4− complexes (see scheme).