Abstracts 1997

Abstract of Publication No. 301

B. A. Moral, F. Rodriguez, R. Valiente, M. Moreno and H. U. Güdel
Local Structure of Cu2+ in the (C2H5NH3)2MCl4:Cu2+ (M = Cd, Mn) Layer Perovskites.
Influence of Hydrostatic Pressure in the 0-60 kbar Range

Z. Phys. Chem. 201, 151-158 (1997)      Full Text (PDF)     

Abstract: This paper deals with the effect of pressure on the charge-transfer spectra of CuCl64- complexes formed in Cu2+ doped (C2H5NH3)2MCl4 (M = Cd, Mn). A pressure-induced redshift is observed for the first charge-transfer band in both crystals. While the shift is continuous for the Mn crystal at a rate of -40 cm1/kbar in the 0-60 kbar range, it experiences an abrupt jump of -1400 cm1 around 26 kbar for the Cd crystal. Such a discontinuous behaviour is interpreted in terms of a structural change in the CuCl64- coordination geometry from an axially elongated octahedron to a more compressed geometry. The present results are compared with those reported for the pure (C2H5NH3)2CuCl4 crystal.

Last modified: 13.12.11 by Gabriela Frei