The Structure of Dichloro(4-hydroxy-L-proline)cadmium(II)

Abstract An X-ray diffraction study of the title complex has been carried out. The crystal is monoclinic, with the space group P21; Z=2; a=8.196(4), b=7.275(3), c=7.740(4) Å, β=103.73(4)° Full-matrix least-squares refinements have led to the final R value of 0.030. The structure consists of one-dimensional polymers bridged by chlorine atoms and a carboxyl group. Four chlorine atoms coordinate to a cadmium atom and form a square plane. The planes extend in the direction of the b axis like an infinite folding screen, sharing opposite edges. From the trough positions in the zigzag structure, the carboxyl oxygen atoms of 4-hydroxy-l-proline coordinate forkedly to two cadmium atoms. The ligand is a zwitter ion in the complex.