Crystal structures and luminescent properties of two cadmium complexes containing the N,N′-bis-(4-pyridylmethyl) piperazine ligand

Two cadmium coordination polymers based on the flexible ligand N,N′-bis-(4-pyridyl-methyl) piperazine (bpmp), formulated as {[Cd(bpmp)(H2O)(Cl)2]·C2H5OH·2H2O}n (1) and {[Cd(bpmp)(H2O)4]·2NO3·2H2O}n (2), are reported. The crystal structures of the as-synthesized complexes were determined by single-crystal X-ray diffraction analyses. Complex 1 possesses a chloride-bridged two-dimensional (2-D) wave-like layer structure containing (6,3) networks, with the bpmp ligands displaying a cis-conformation. Complex 2 has a one-dimensional (1-D) chain structure built by octahedral Cd nodes and trans-bpmp bridges. Solid state emission spectra of both the two compounds have also been studied at room temperature.