Synthesis and Crystal Structure of a Novel Ca(II) Coordination Polymer Containing Dipyridine Dicarboxylic Ligand

The novel alkaline metal complex Ca(BPDCH)2(1, BPDCH2 = 2,2'-bipyridine-5,5'-dicarboxylic acid) has been synthesized by the hydrothermal reaction of Ca(NO3)2·4H2O with 2,2'-bipyridine-5,5'-dicarboxylic acid. The molecular and crystal structures of complex 1 have firstly been characterized by FTIR, elemental analysis, and X-ray single-crystal diffraction. The 3D MOF structure of complex 1 was interpreted by the versatile binding modes-the intermolecular hydrogen bonds and π-π stacking interactions of 2,2'-bipyridine-5,5'-dicarboxylic acid ligand. The analysis results show complex 1 belongs to a coordination polymer with 3D MOF structure. The results of thermogravimetric analysis and solubility demonstrate complex 1 is a thermostable compound and does not dissolve in water and traditional organic solvents.