STRUCTURE OF AN ERBIUM COMPLEX WITH L-PROLINE

In the structure of -(L-proline-O)erbium(III)}-bis-mu-(L-proline-O:O') hexaperchlorate], each Er3+ ion is coordinated by five carboxyl O ato ms from the L-proline molecules and three water molecules. Four of the SiX L-proline molecules act as bidentate bridging ligands to link the Er3+ ions through the carboxyl groups, thus producing a one-dimension al chain structure. The other two ligands coordinate unidentately to t he rare-earth ions. Hydrogen bonds formed between the coordinated wate r molecules and between the water and unidentate proline ligand stabil ize the polymeric chain.