title: catena-Poly[bis{mu-dihydrogen [(5-carboxypentylimino)dimethylene]diphosphonato-kappa2O:O'}cadmium(II)].
abstract: The title compound, [Cd(C(8)H(18)NO(8)P(2))(2)](n), synthesized by hydrothermal methods, exhibits a layered structure in which the Cd(II) ion, occupying a centre of symmetry, is coordinated by six O atoms from four phosphonate ligands. The crosslinkage of CdO(6) octahedra by bridging phosphonate ligands results in a cadmium(II) phosphonate layer. Within the layer, there exists a 16-membered ring incorporating four -Cd-O-P-O- linkages. The uncoordinated carboxyl group of the ligand is oriented so that it penetrates the adjacent layer, taking part in hydrogen bonding to two uncoordinated phosphonate O atoms to form a CO(2)H/HO(2)P motif.
authors.affiliation: School of Chemistry and Chemical Engineering, Jinggangshan University, Ji'an, Jiangxi 343009, People's Republic of China. yingshaoming@hotmail.com
authors.forename: Shao-Ming
authors.initials: SM
authors.lastname: Ying
authors.forename: Xiao-Niu
authors.initials: XN
authors.lastname: Fang
authors.forename: Fan
authors.initials: F
authors.lastname: Zhong
authors.forename: Jian-Hong
authors.initials: JH
authors.lastname: Wu
authors.forename: Ren-Yun
authors.initials: RY
authors.lastname: Kuang