Bulletin of the Korean Chemical Society

  • 제14권5호
  • /
  • Pages.567-574
  • /
  • 1993
  • /
  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
권호 표지
DOI QR코드

DOI QR Code

Electrochemical Behavior of Mordant Red 19 and its Complexes with Light Lanthanides

  • Sang Kwon Lee (Department of Chemistry, Seoul National University) ;
  • Taek Dong Chung (Department of Chemistry, Seoul National University) ;
  • Song-Ju Lee (Department of Chemistry, Chonnam National University) ;
  • Ki-Hyung Chjo (Department of Chemistry, Chonnam National University) ;
  • Young Gu Ha (Department of Chemistry, Seoul National University) ;
  • Ki-Won Cha (Department of Chemistry, Inha University) ;
  • Hasuck Kim (Department of Chemistry, Seoul National University)
  • 발행 : 1993.10.20
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Mordant Red 19(MR19) is reduced at mercury electrode at -0.67 V vs. Ag/AgCl with two electrons per molecule in pH 9.2 buffer by differential pulse polarography and linear sweep voltammetry. The peak potential is dependent on the pH of solution. The exhaustive electrolysis, however, gives 4 electrons per molecule because of the disproportionation of the unstable hydrazo intermediate. The electrochemical reduction of lanthanide-MR19 complexes is observed at more cathodic potential than that of free ligand. The difference in peak potentials between complex and free ligand varies from 75 mV for $La^{3+}$ to 165 mV for $Tb^{3+}$ and increases with increasing the atomic number of lanthanide. The electrochemical reduction of lanthanide complexes with MR19 is due to the reduction of ligand itself, and it can be potentially useful as an indirect method for the determination of lanthanides. The shape of i-E curves and the scan rate dependence indicates the presence of adsorption and the adsorption was confirmed by potential double-step chronocoulometry and the effect of standing time. Also the surface excess of the adsorbed species and diffusion coefficients are determined. The composition of the complex is determined to be 1 : 2 by spectrophotometric and electrochemical methods.

키워드

참고문헌

  1. J. Electroanal. Chem. v.89 E. Steeman;E. Temmerman;F. Verbeek
  2. Anal. Chem. v.56 M. Zhang;X. Gao
  3. Anal. Chem. v.22 H. H. Willard;J. A. Dean
  4. Proceedings of the Basic Science Research Institute v.4 S. W. Kim;J. H. Jang;M. Y. Seo;L. M. Doh
  5. Aust. J. Chem. v.15 T. M. Florence;G. H. Aylward
  6. Z. Anal. Chem. v.216 S. M. Palmer;G. F. Reynolds
  7. J. Inorg. Nucl. Chem. v.35 M. L. Thakur;S. L. Waters
  8. Chinese J. Rare Earth v.3 X. Z. Ye;X. Gao
  9. Inorg. Chem. v.19 J. Massaux;J. Desreux;C. Chambre;G. Duyckaerts
  10. J. Chem. Soc. Chem. Comm. C. Hall;N. Sharpe;I. Danks;Y. Sang
  11. J. Electroanal. Chem. v.249 M. Piou;C. Clarisse
  12. Abstracts of the 68th KCS Annual Meeting Si Soon Lee;Ku Soon Chung
  13. Bull. Kor. Chem. Soc. v.14 Hasuck Kim;Sang Kwon Lee
  14. Encyclopedia of Electrochemistry of the Elements v.XIII A. J. Bard;H. Lund
  15. Electrochemical Methods A. J. Bard;Faulkner
  16. J. Am. Chem. Soc. v.78 H. A. Laitinen;T. J. Kneip
  17. Trans. Faraday Soc. v.58 E. Coates;B. Rigg
  18. J. Electroanal. Chem. v.21 T. M. Florence;W. L. Belew
  19. Trans. Faraday Soc. v.44 J. E. B. Randles
  20. Collect. Czech. Chem. Commun. v.13 A. Sevcik
  21. Anal. Chem. v.39 R. H. Wopschall;I. Shain
  22. Collect. Czech. Chem. Commun. v.18 J. Koryta
  23. Electrochemical Methods A. J. Bard;Faulkner
  24. Aust. J. Chem. v.18 T. M. Florence
  25. Aust. J. Chem. v.15 T. M. Florence;G. H. Aylward