Lanthanide Carboxyphosphonates Ln(O3PCH2−NC5H9−COO)(H2O)2·xH2O with Open Framework Structures Containing Parallelogram-like Channels

Abstract

On the basis of (4-carboxypiperidyl)-N-methylenephosphonic acid (4-cpmpH3), four isostructural lanthanide phosphonates Ln(O3PCH2−NC5H9−COO)(H2O)2·xH2O [Ln = Eu(1), Gd(2), Tb(3), Dy(4)] have been synthesized. All exhibit three-dimensional open framework structures, in which inorganic double chains made up of {Ln2O14} dimers and {PO3C} linkages are connected through organic moieties of 4-cpmp3−. Uniform parallelogram-like channels are observed in the [100] direction. Luminescent properties of 1 and 3, and the magnetic properties of 2 are investigated.