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The crystal structures have been determined systematically for mononuclear copper (II) complexes incorporated various ethylenediamine ligands and several cyanide-bridged bimetallic assemblies with linear one-dimensional, zigzag one-dimensional, two-dimensional, and co-crystals of mononuclear and one-dimensional complexes. The temperature dependence of molecular crystal lattices and local pseudo Jahn-Teller distortion were elucidated that larger tetragonally distorted chromophores, associated with ground electronic states, exhibited smaller structural changes by cooling temperature for the present systems in a solid-state matrix. On the other hand, characters of coordination bonds as well as structural distortion for copper ions in metalloproteins in a flexible polypeptide matrix usually. By comparing with them, we discuss the role of matrix for tuning geometric and electronic structures of functional copper (II) ions showing Jahn-Teller distortion.

Jahn-Teller Distortion and Electronic Functions of Copper(II) Complexes in Protein and Molecular Crystal Matrix