Skip to main content

RETRACTED ARTICLE: Synthesis and electrochemical studies of phenylazo substituted tetraaza macrocyclic complexes of Ni(II)


Synthesis and characterization of some phenyl azo substituted tetraaza macrocyclic complexes of Ni(II) are reported. Electrochemical behaviour of these macrocyclic complexes has been examined using polarographic, voltammetric and spectroscopic techniques. These studies show that both the ligand and the metal are electrochemically active. The electrochemical behaviour of the azo function has been shown to occur through a single four-electron process. When a nitro group is also present, the nitro function of the azo moiety is reduced in a six-electron cathodic wave.

This is a preview of subscription content, access via your institution.


  1. Volbeda A, Charon M H, Piras C, Hatchikian E C, Frey M and Fontecilla J C Camps 1995Nature (London) 373 580

    Article  CAS  Google Scholar 

  2. Marganisan C A, Vazir H, Baidya N, Olmstead M M and Mascharak P K 1995J. Am. Chem. Soc. 117 1584

    Article  Google Scholar 

  3. Brooker S and Croucher P D 1995J. Chem. Soc., Chem. Commun. 1493 2075

    Article  Google Scholar 

  4. Brooker S and Davidson T C 1997Chem. Commun. 2007

  5. Brooker S, Croucher P D and Roxborgh F M 1996J. Chem. Soc., Dalton Trans. 3031

  6. Sirish M and Maiya B G 1994J. Photochem. Photobiol. A77 189

    Article  Google Scholar 

  7. Rao T A and Maiya B G 1995J. Chem. Soc., Chem. Commun. 939

  8. Basolo F, Hoffman B M and Ibers J A 1975Acc. Chem. Res. 8 384

    Article  CAS  Google Scholar 

  9. Gutsche C D and Andreetti G D 1991 InInclusion compounds (eds) J L Atwood, JED Daies and D D MacNicol (Oxford: University Press) vol. 4

    Google Scholar 

  10. Izatt R M, Lamb J D, Hawkins R T, Brown P R, Izatt S R and Christensen J J 1983J. Am. Chem. Soc. 105 1782

    Article  CAS  Google Scholar 

  11. Martel A E and Taqui Khan M M 1973Inorg. Biochem. 2 654

    Google Scholar 

  12. Geyes R P 1974Bull. Parenter. Drug Assoc. 28 88; Baldwin J E 1975Newsweek 91

    Google Scholar 

  13. Price R 1970 InChemistry of synthetic dyes (ed.) K Venkataraman (New York: Academic Press) vol. 3

    Google Scholar 

  14. Busch D H 1964Rec. Chem. Prog. 25 107

    CAS  Google Scholar 

  15. Cummings S C and Sievers R E 1970J. Am. Chem. Soc. 92 215

    Article  CAS  Google Scholar 

  16. Zollinger H 1961Aliphatic and aromatic compounds (New York: Interscience)

    Google Scholar 

  17. Kolthoff IM and Lingane J J 1952 InPolarography (New York: Interscience) vol. 2

    Google Scholar 

  18. Meites L 1965 InPolarographic techniques (New York: Interscience)

    Google Scholar 

  19. Martin J G, Wei R M C and Cummings S C 1972Inorg. Chem. 11 475

    Article  CAS  Google Scholar 

  20. Florence T M 1974J. Electroanal. Chem. Interfacial Electrochem. 52 115

    Article  CAS  Google Scholar 

  21. Goddard J D and Joslin T A 1979J. Inorg. Nucl. Chem. 41 1229

    Article  CAS  Google Scholar 

  22. Mann C K 1969 InElectroanalytical chemistry (ed.) A J Bard (New York: Marcel Dekker) vol.3

    Google Scholar 

  23. Curtis N F and Cook D F 1967Chem. Commun. 962

  24. Olson D C and Vasilevskis J 1969Inorg. Chem. 8 164

    Google Scholar 

  25. Barefield E K and Busch D H 1970Chem. Commun. 522

  26. Truex T J and Holm R H 1972J. Am. Chem. Soc. 94 4529

    Article  CAS  Google Scholar 

  27. Thomas F G and Bato K G 1975 InChemistry of the hydrazo, azo and azoxy groups (ed.) S Patai (London: Wiley)

    Google Scholar 

Download references

Author information

Authors and Affiliations


Additional information

It has been brought to our notice that the paper ‘Synthesis and electrochemical studies of phenylazo substituted tetraaza macrocyclic complexes of Ni(II)’ by Randhir Singh, Suresh Kumar and Amarendra Bhattacharya, Proc. Indian Acad. Sci. (Chem. Sci.), vol. 112, No. 6, December 2000, pp. 601–605 has been plagiarized from an earlier paper published in J. Inorg. Nucl. Chem. (1979, vol. 41, pp. 1229–1232).

Our own investigations reveal that the author has reproduced cyclic voltammograms and also some paragraphs verbatim from the earlier paper.

The author was provided an opportunity to explain the alleged plagiarism and to submit copies of original polarograms he had recorded and laboratory notebooks to substantiate that he had actually prepared the compounds and recorded their cyclic polarograms. The author in his reply stated that he was not in a position to provide the required details. The Editorial Board in its deliberations expressed concern over this matter and decided to withdraw this article.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Singh, R., Kumar, S. & Bhattacharya, A. RETRACTED ARTICLE: Synthesis and electrochemical studies of phenylazo substituted tetraaza macrocyclic complexes of Ni(II). J Chem Sci 112, 601–605 (2000).

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI:


  • Phenylazo macrocyclic complex
  • electrochemical studies