N. Choi, I. Khan, R. W. Matthews
1994
Citations
0
Influential Citations
20
Citations
Journal
Polyhedron
Abstract
Abstract Synthesis of the polymeric complex [Cd(OH)(H3L)(H2O)n·nH2O (I) [H4L = piperazine-1,4-diylbis(methylene)bis(phosphonic acid), (II)] and X-ray crystal structures of I and II·HCl are reported. In I, the phosphonic acid coordinates as a monoanionic zwitterion through one oxygen atom of each phosphonate group to give polymeric chains of Cd atoms bridged through the organic function of the ligands. Three water molecules and one hydroxo ligand complete the approximately octahedral coordination sphere around cadmium. The piperazine ring has the chair conformation in both I and II · HCl, and II can be regarded as doubly zwitterionic.