The First Metal Complexes of 4,4-Biimidazole and 4,4-Biimidazolate with Hydrogen-Bonding Networks on the Cu(II) Complexes: 1-D Structures by N–H···X···H–N Hydrogen-Bonding

The Cu(II) complexes based on 4,4ʹ-biimidazole and its deprotonated mono-anionic ligands were synthesized as the first metal complexes, which exhibit hydrogen-bonding networks. X-ray crystal structure analyses reveal the (pi)-stacking structure of each complex and N–H···X or N···H–X type hydrogen-bondings.