Co(II) Coordination Polymer Based on Bis(carboxyl) Dibenzylamine and Bis(imidazole) Biphenyl Ligands: Synthesis, Crystal Structure and Detection for Fe3+ Ions in Water

A new Co(II)-based coordination polymer (CP), namely {[Co(H(3)bcba)(bdmi)] center dot H2O}(n) (1), where H(3)bcba is 4, 4'-biscarboxyl-N,N-dibenzylamine and bdmi is 4,4'-bis(2-methyl-1H-imidazol-1-yl)-1,1'-biphenyl, has been hydro. thermally synthesized and characterized by single. crystal X-ray diffraction, IR spectroscopy, elemental analysis, thermogravimetric and Hirshfeld surface analyses. X-ray diffraction crystallographic analyses show that the partly deprotonated H(3)bcba ligand coordinates two Co(II) ions with two carboxylate groups bending bidentate chelate modes, while bdmi serves as a mu(2)-bridging ligand in 1, result in a 2D polymeric grid frameworks with a 4-connected (4, 4) topology. In the crystal, a 3D supramolecular architecture is further formed by O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds, C-H center dot center dot center dot O and C-H center dot center dot center dot N interactions, as well as C-H center dot center dot center dot pi stacking in 1. Complex 1 showed intense luminescence in the solid state, and exhibited a high selectivity and sensitivity for Fe3+ ions through the fluorescence quenching effect in aqueous solution at room temperature. CCDC: 1973191.