Abstract
A magnetic and structural characterization of single crystals of the copper derivative of the amino acid d,l-isoleucine, Cu[NH 2(CH) 2CH 2(CH 3) 2CO 2] 2, was performed by EPR and X-ray diffraction techniques. The complex crystallizes in the orthorhombic space group Aba2, with a = 11.165(3) Å, b = 11.111(3) Å, c = 25.985(6) Å, and Z = 8. The copper ions occupy sites of point symmetry C 2. The position and peak-to-peak linewidth of the single EPR line observed were measured at 9.7 GHz and 293 K in three perpendicular planes of the sample. The gyromagnetic tensor g has near axial symmetry around ĉ, 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 g 1 = 2.0607(5), g 2 = 2.0616(5), and g 3 = 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.
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