Crystal structure and properties of catena-poly[manganese(II)-mu-dichloro-mu-L-proline-kappa O-2,O'] monohydrate

The crystal structure and some physico-chemical properties of MnCl2 . Pro . H2O (Pro=L-proline) were studied. This compound is stable up to approximately 313 K. Upon heating the complex loses a molecule of water and is transformed into the oxide in two steps. The IR spectrum was recorded. The compound crystallizes in the orthorhombic space group P2(1)2(1)2(1) with a 7.112(2) Angstrom, b = 10.196(2) Angstrom, c = 13.249(3) Angstrom and Z = 4. The manganese atoms in the polymeric chain are bridged by two chlorine atoms and oxygen atoms from the carboxylate group of L-proline. The Mn-CI bond distances range from 2.535(1) Angstrom to 2.581(1) Angstrom, the Mn-O bond distances range from 2.135(2) Angstrom to 2.153(2) Angstrom and Mn-Mn bond distances ate 3.556(1) Angstrom. One molecule of water is hydrogen-bonded with a nitrogen atom of the L-proline ring.