Synthesis, crystal structure and electrocatalytic behavior of a copper (II) complex derived from acylpyrazolone double Schiff bases

A new double Schiff base complex, Cu(PMFP)(2)en (HPMFP= 1-phenyl-3-methyl-4-(2-furoyl)-5-pyrazolone, en= ethylenediamine), has been synthesized and characterized by elemental analysis, IR, UV, fluorescence spectra, thermal analysis, X-ray single crystal diffraction and cyclic voltammetry (CV). Its crystal structure is monoclinic with space group Pbca and cell parameters: a= 22.263(3)angstrom, b= 13.671(2)angstrom, c= 10.0920(16)angstrom, Z= 4, S= 1.028, R-1= 0.0500 and wR(2)= 0.1285. It was found that the Cu2+ ion is located in the coordination center. The Cu(II) has a slightly distorted plane quadrilateral coordination environment with two oxygen atoms and two nitrogen atoms of double Schiff base ligand in the equatorial plane. The complex has a one-dimensional chain supramolecular structure, which is connected by CH...N bonding interactions. In the electrochemical experiments, the CV curve displays an oxidation peak in the presence of uric acid with Ep= 0.216V in pH= 7.0, showing that the Cu(PMFP)(2)en/glassy carbon modified electrode has an electrocatalytic activity toward uric acid.