The Open Crystallography Journal

2011, 4 : 8-15
Published online 2011 March 10. DOI: 10.2174/1874846501104010008
Publisher ID: TOCRYJ-4-8

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

Takashiro Akitsu and Satoru Sonoki
Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjukuku, Tokyo 162-8601, Japan.

ABSTRACT

By substituting H/D and 18O isotopes of water molecules, we prepared co-crystals of one-dimensional cyanidebridged 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 reflectance 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 compounds exhibited positive thermal expansion of lattice, crystal structures exhibited slight differences associated with Jahn- Teller distortion around Cu(II) coordination environment.

Keywords:

Lattice distortion, Jahn-Teller effect, copper, cyanide, isotope.