Synthesis, crystal structure and fluorescence of two novel mixed-ligand cadmium coordination polymers with different structural motifs

Two novel cadmium((II)) coordination compounds, [Cd(bpe)(1.5)(NO2.BDC)].0.25H(2)O (1) and [Cd(bpp)(NO2-BDC)(H2O)].0.25H(2)O (2) [NO2.BDCH2 = 5-nitro-1,3-benzenedicarboxylic acid, bpe = 1, 2-bis (4 -pyridyl) ethane, bpp = 1,3-bis(4-pyridyl)propane] have been hydrothermally synthesized by reaction of cadmium chloride and NO2.BDC with the homologous ligands bpe and bpp, respectively. The former compound displays a remarkable three-dimensional architecture sustained by the catenation of 2D bilayers, while the latter exhibits a unique twofold interpenetrating three-dimensional architecture. The thermal and fluorescence properties associated with their crystal structures have been measured. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.