Magneto-structural correlations. Rietveld refinement of the three-dimensional crystal structure of Mn(en)Ni(CN)(4) (en = ethylenediamine) and magnetic interactions through the [Ni(CN)(4)](2-) anion

摘要

Magneto-structural correlations in Mn(en)Ni(CN)(4) (en = ethylenediamine) MENC have been studied. The crystal structure of MENC was refined by Rietveld analysis of X-ray powder diffraction data; it is three-dimensional (3d) and is built up of [Mn(en)](2+) cations with deformed octahedrally coordinated Mn(II) (S = 5/2) atoms and [Ni(CN)(4)](2-), anions containing square-planarly coordinated Ni(II) (S = 0) atoms. The building species are linked by bridging mu(2)-cyano ligands. The characterization of magnetic properties confirmed the expected 3d nature of spin correlations by observing lambda-ike anomaly in specific heat at T-C = 0.47 K. The resulting exchange interaction J/hc = -0.12 cm(-1) is somewhat smaller than that found in other complexes with the same type of exchange paths. (c) 2005 Elsevier SAS. All rights reserved.