Hydrothermal synthesis, crystal structure, and electrochemical property of a new 3-D coordination polymer based on benzene-1,2,4,5-tetracarboxylate bridging ligand: [Cu2(btec)(en)2] n

Abstract A new 3-D copper(II) complex, formulated as [Cu2(btec)(en)2] n (1) [H4btec = benzene-1,2,4,5-tetracarboxylate, and en = ethylenediamine], was hydrothermally synthesized and structurally characterized by elemental analysis, IR spectroscopy, thermal gravimetric analysis, and single crystal X-ray diffraction. The structural analysis of 1 reveals that copper(II) connect by μ6-bridging btec to form a 3-D coordination polymer, in which four carboxylates of btec show monodentate and bidentate coordination. Complex 1 was used as solid bulkmodifier to fabricate renewable carbon paste electrode (1-CPE) by direct mixing method. The cyclic voltammogram of 1-CPE displayed one-electron quasi-reversible redox waves in potential range 300 to −300 mV due to Cu(II)/Cu(I). Moreover, 1-CPE showed electrocatalytic activity toward the reduction of nitrite. Keywords: Copper complexHydrothermal synthesisCrystal structureElectrochemical property Acknowledgments This work was supported by the National Natural Science Foundation of China (No. 20871022) and the Education Office Foundation of Liaoning Province (No. 2009R03 and 2009A028).