Anisotropic Thermally-Accessible Lattice Distortion of a Cu(II)-Cr(VI) Complex Bimetallic Oxide by Adsorbing a Chiral One-Dimensional Cu(II)-Cr(VI) Coordination Polymer

The authors have prepared and characterized a chiral one-dimensional Cu(II)-Cr(VI) coordination polymer, (CuL2)(Cr2O7) (L = (1R, 2R)-diaminocyclohexane), which exhibited intense d-d bands as well as charge transfer bands in the solid state electronic and CD spectra. Thermally-accessible lattice distortion was observed along the crystallographic a axis, which corresponded to Jahn-Teller distortion of Cu(II) chromophores. After firing (CuL2)(Cr2O7), they could obtain a Cu(II)-Cr(VI) complex bimetallic oxide showing ferromagnetism and isotropic thermally-accessible lattice distortion. Preparation of composite materials of the coordination polymers and a complex bimetallic oxide could be confirmed by IR spectra and magnetic properties. It should be noted that the complex bimetallic oxide as the composite exhibited anisotropic thermally-accessible lattice distortion by adsorption of the chiral one-dimensional coordination polymer.