Syntheses, Structures, and Fluorescent and Magnetic Properties of Four Metal–organic Coordination Polymers Constructed from Dicarboxylate Ligands

Four new coordination polymers, namely [Cd(OBA)(H2O)(3)](n) (1), [Zn-2(OBA)(2)(PBHB)(2)](n) (2), [Mn(OBA)(BBHB)(2)](n) (3), and [Co(MIP)(BPP)](n) (4) (H(2)OBA = 4-oxyacetate-benzoic acid, PBHB = 1,1 '-(1,3-propanediyl)bis-1H-benzimidazole, BBHB = 1,1 '-(1,4-butanediyl)bis-1H-benzimidazole, H2MIP = 5-methylisophthalic acid, and BPP = 1,3-bis(4-pyridyl)propane)), were prepared and structurally characterized by single-crystal X-ray diffraction. In complex 1, the Cd(II) atoms are bridged by OBA(2-) anions to give 1D zigzag chain, and the 1D chains are stacked into 2D network through the O-H-O hydrogen bonds. The Mn(II) and Zn(II) centers in 2 and 3 are connected by OBA(2-) anions to form 1D chains, which are further bridged by N-donor ligands to generate 2D layer. Complex 4 shows twofold 3D interpenetrating network. Furthermore, the fluorescence of complexes 1 and 2 and magnetic properties of 3 and 4 have also been investigated.