Two Cu(II) coordination polymers based on a flexible bis(pyridyl-tetrazole): Solvent-ratio induced various structures and distinct adsorption performance for organic dyes.

Two new coordination polymers (CPs), namely, [Cu(4-bptzp)(BDC)] ( 1 ) and [Cu 2 (4-bptzp) 2 (BDC)Cl 2 ] ( 2 ) (4-bptzp = 1,4-bis(5-(4-pyridyl)tetrazolyl)propane, H 2 BDC = 1,3-benzenedicarboxylic acid) were synthesized by changing the proportion of the solvents under the solvothermal conditions, and structurally characterized by single crystal X-ray diffraction, infrared spectroscopy (IR), powder X-ray diffraction (PXRD), elemental analyses and thermogravimetric analyses (TGA). The 4-bptzp was firstly introduced into the CPs. Complexes 1 and 2 show two kinds of 1D chain structures. Complex 1 contains the 1D ladder-like [Cu(BDC)] n chains and Cu 2 (4-bptzp) 2 rings, while complex 2 consists of the 1D linear [Cu 2 (BDC)Cl 2 ] n chain containing the bridging Cl − ions and Cu 2 (4-bptzp) 2 rings. The adjacent 1D chains in 1 and 2 are extended to 2D supramolecular layers by the hydrogen bonding interactions, respectively. In addition, the electrochemical properties and dye adsorption properties of complexes 1 and 2 have been investigated. The solvent ratio plays a key role in adjusting their structures and adsorption property. [ABSTRACT FROM AUTHOR]