Abstract
Complexes of four bivalent metals with 4-hydroxy-L-proline have been prepared and characterized by means of infrared absorption, powder diffuse reflection, electronic spectra, magnetic susceptibility, and thermal analysis. The complexes appear to be of three distinct types. The first type includes ML 2·nH 2O (M = Ni, Zn, Cu, L = 4-hydroxy-L-prolinato anion), and CuClL·H 2O is a second type. In both the ligand chelates metal ions through the nitrogen atom of the pyrrolidine ring and the oxygen atom of the carboxylato group. CuL 2 appears to adopt a cis geometry, and in the second type a chloride ion seems to bridge to two copper(II) ions. CdCl 2HL is a third type, in which the cadmium ion is coordinated through the oxygen atom of the carboxylato group and chloride ions, but is not coordinated through the nitrogen atom.
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