2012 Volume 61 Issue 3 Pages 251-255
Nickel(II) and copper(II) complexes with a hexadentate ligand, derived from a condensation reaction between 1-phenyl-1,3,5-hexanetrione and diamine, were characterized by electrochemical measurements to elucidate the usefulness as an electrode material for a plasticized PVC membrane electrode. Among the complexes tested, a nickel(II) mononuclear complex with 5,5-(1,2-ethanediyldinitrilo)bis(1-phenyl-1,3-hexanedione) has functionality as a perchlorate ionophore and lipophilic salt. A PVC membrane electrode that consists of the nickel(II) complex (30 mg), o-NPOE (125 mg) and poly(vinyl chloride) PVC (50 mg) shows good results with a Nernstian response, 53 mV/decade, in accordance with a wide ClO4− activity change in the activity range, 1 × 10−7 − 8 × 10−2 M and ClO4− selectivity with respect to Cl−, log k pot ClO4,Cl is − 5.35. In addition, to evaluate the application of this electrode, a calibration curve of ClO4− was obtained by adding ClO4− in commercial milk. It was found that the lower detection limit of the concentration of ClO4− is ca. 1 ppm.
