Isotope Effects for Lattice Strain and Pseudo Jahn-Teller Distortion of Chiral Cyanide-Bridged Cu(II)-Co(III), Cr(III), and Fe(III) Bimetallic Assemblies

By substituting H/D and 18 O isotopes of water molecules, we prepared co-crystals of one-dimensional cyanide- bridged Cu(II)-Cr(III), Cu(II)-Co(III), and Cu(II)-Fe(III) bimetallic assemblies and mononuclear Cu(II) complexes, (CuL2)3(M(CN)6)2·4H2O (L = trans-cyclohexane-(1R, 2R)-diamine; M = Cr, Co, and Fe). Solid state CD and diffuse re- flectance electronic spectra exhibited typical difference of metal ions and little isotope effects. While H/D isotope effects emerged as differences of small intermolecular magnetic interactions and obvious shifts of IR bands. Though all com- pounds exhibited positive thermal expansion of lattice, crystal structures exhibited slight differences associated with Jahn- Teller distortion around Cu(II) coordination environment.