Electrochemical Behavior of some Metal Complexes of 1-Phenyl-3-methyl-4-benzoyl-5-pyrazolone and Its Acyl Derivatives in Non-aqueous Solvents

  • Akira Endo Department of Chemistry, Faculty of Science and Technology, Sophia University, Chiyoda-ku, Tokyo
  • Cherrie B. Pascual Institute of Chemistry, University of the Philippines, Diliman, Quezon City
  • Yosifumi Akama Department of Chemistry, Faculty of Science and Engineering, Meisei University, Hino-shi, Tokyo
  • Kunio Shimizu Department of Chemistry, Faculty of Science and Technology, Sophia University, Chiyoda-ku, Tokyo
Keywords: electrochemistry, metal complexes, pyrazolonate complexes, 13-diketonato complexes, cyclic voltammetry, lanthanide metals

Abstract

The complexes of divalent metals (Ni2+, Cu2+, Mn2+, Co2+, Cd2+), trivalent metals (Fe3+ and Cr3+), lanthanide metals (La3+, Pr3+, Eu3+, Lu3+) with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (Hpmbp) and the Fe3+ complexes with its acyl derivatives (HpmCn) were prepared and their electrochemical behavior was investigated. The cyclic voltammogram of each lanthanide complex with Hpmbp in N,N-dimethylformamide gave an irreversible one-electron oxidation peak. In the case of the divalent metal complex, an irreversible oxidation peak was observed for each complex in acetonitrile. The Cu2+ and Cd2+ complexes also exhibited an irreversible reduction peak at the cathodic potential sweep with an anodic stripping peak during the reverse anodic sweep. The Fe3+ and Cr3+ complexes with Hpmbp and Fe3+ complex with HpmC-n gave quasireversible reduction peaks corresponding to the reduction of the metal in dichloromethane. Linear correlation was established between the reduction potentials of Fe3+ pyrazolonato complexes and the pKa value of the ligands.
How to Cite
Endo, A., Pascual, C. B., Akama, Y., & Shimizu, K. (1). Electrochemical Behavior of some Metal Complexes of 1-Phenyl-3-methyl-4-benzoyl-5-pyrazolone and Its Acyl Derivatives in Non-aqueous Solvents. KIMIKA, 17(2), 43-47. https://doi.org/10.26534/kimika.v17i2.43-47
Section
Research Articles