A Novel Coordination Polymer based on a New Multidentate Ligand: Synthesis, Structure and Properties

Coordination polymers (CPs), as a new class of hybrid functional materials, have attracted tremendous interest owing to their potential applications. The effective strategy for new CPs is to design and use new organic ligands. Therefore, we have synthesized a new multidentate ligand 1,4-bis-((3-carboxyl-2-oxidopyridinium)methyl)benzene (H2L). Furthermore, a new CP [CuL(H2O)] (1) has been obtained under mild conditions. Single-crystal X-ray diffraction analysis shows that the Cu(II) cation and L anion are interconnected to form a chain structure, and intermolecular π-π interactions extend the chain structure to a 3D supramolecular structure. In addition, electrochemical performances of compound 1 have been investigated as an anode material in lithium ion batteries. The discharge/charge curves and cycling performance are measured at the current density of 100 mA g–1 and 500 mA g–1, respectively. In particular, it displays excellent cycling stability after 1000 cycles at 500 mA g–1.