Abstract
The title compound (CHCO 2CH 3NH 2) 2Zn(II), abbreviated as Zn( l-alanine) 2, crystallizes in the monoclinic space group P2 1 with a = 8.637(1), b = 5.334(1), c = 9.581(1) Å, β = 90.36(1)°, and Z = 2. The structure was solved employing 1206 independent X-ray reflections with I > 2 gs( I) by Patterson and Fourier methods and refined by full-matrix least squares to R1 = 0.031. The Zn(II) ion is fivefold coordinated with two bidentale amino acid ligands and a carboxylate oxygen of another symmetry-related alaninate ion. EPR spectra of copper impurities were measured with the magnetic field in three orthogonal planes of a single crystal sample. The g and hyperfine coupling tensors were evaluated from the spectra. These values are discussed in terms of the structure of Zn( l-alanine) 2 and compared with those reported for the quasi-isomorphic compound Cu( l-alanine) 2. The distortion of the Zn site when occupied by copper(II) impurities is analyzed.
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