Synthesis, structure, and luminescent property of a novel cadmium (II) carboxyphosphonate with a 2D layered structure using 1,4-benzenedicarboxylic acid as second linker

By using the (2-carboxypiperidyl)-N-methylenephosphonic acid as the phosphonate ligand and 1,4-benzenedicarboxylic acid as the second metal linker, a novel cadmium(II) carboxyphosphonate with a 2D layered structure, namely, [Cd2(HL)(bdc)] (1) (H3L═H2O3PCH2―NC5H9―COOH, H2bdc═HOOCC6H4COOH) has been synthesized under hydrothermal conditions. In compound 1, each Cd(II) atoms are octahedrally coordinated [Cd(1)O6, Cd(2)O6]. These cadmium octahedra form a 1D double chain along the b-axis through edge- and corner-sharing, and such chains are further interlinked by the bdc2 − anions into a 2D layer in the bc-plane. The luminescent property of compound 1 has also been studied.