Magnetic and Structural Properties of Bis(D,L-isoleucinato)copper(II)

D. M. MARTINO; C. A. STEREN; R. CALVO; O. E. PIRO

JOURNAL OF SOLID STATE CHEMISTRY

Academic Press

Año: 1991 vol. 90 p. 211 - 215

0022-4596

A magnetic and structural characterization of single crystals of the copper derivative of the amino acid D,L-isoleucine, Cu[NH,(CHf2CH2(CH&Z0,],, was performed by EPR and X-ray diffraction techniques. The complex crystallizes in the orthorhombic space group Aba2, with a = 11.165(3) A, b = 11.111(3) A, c = 25.985(6) A, and Z = 8. The copper ions occupy sites of point symmetry C2. The position and peak-to-peak linewidth of the single EPR line observed were measured at 9.7 GHz and 293 K in three perpendicuiar planes of the sample. The gyromagnetic tensor g has near axial symmetry around 2, with a small anisotropy in the perpendicular plane, in agreement with the orthorhombic symmetry indicated by the crystallographic results. The principal values of g are g1 = 2.0607(5), g2 = 2.0616(5), and g3 = 2.2619(3), with principal directions parallel to the crystal axes. The observed angular variation of the linewidth suggests a layered arrangement of the copper ions.