Journal of Chemical Sciences

, Volume 115, Issue 1, pp 23–28 | Cite as

Equilibrium and spectral studies on ligational behaviour of N,N’-diformylhydrazine

  • G. Bhargavi
  • B. Sireesha
  • Ch. Sarala Devi


The ligand N,N’-diformylhydrazine (DFH) is a resonance hybrid of its keto- and enol-forms. The resonance structures indicate enolisation of one as well as both the carbonyl groups. This indicates the presence of dissociable protons in the molecule. Equilibrium studies carried out with DFH indicate the presence of one dissociable proton. The solid complexes of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Pb(II) with DFH have been synthesized, and have been characterized by elemental analysis, magnetic susceptibility, IR, Far-IR,1H NMR, TGA, FAB and reflectance spectra. IR and1H NMR spectra of the complexes indicate deprotonation of both the enol protons upon complexation. Elemental and TG analyses of Mn(II), Ni(II), Zn(II) DFH complexes indicate 1:1 metal to ligand composition. The dimeric nature of the Mn(II)-DFH complex is supported by its FAB spectrum.


N,N’-diformylhydrazine ligational behaviour resonance hybrid keto-enol forms 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Tomiie Y 1958Acta Crystallogr. 11 875CrossRefGoogle Scholar
  2. 2.
    Carmona P and Lopez R 1982Spectrosc. Lett. 15 187CrossRefGoogle Scholar
  3. 3.
    Fritz H, Kristinson H, Mollenkopf M and Winkler T 1990Magn. Reson. Chem. 28 331CrossRefGoogle Scholar
  4. 4.
    Poslannikova K S, Koshokova A V and Leont’ev V F 1978Obraztsy, Tovarnye Znaki 55 73Google Scholar
  5. 5.
    Irving H M and Rossotti H S 1954J. Chem. Soc. 2904Google Scholar
  6. 6.
    Vogel A I 1968A textbook of qualitative inorganic analysis 3rd ed (London: Longman) p. 264Google Scholar
  7. 7.
    Bencivenni L, Nunziante Cesaro S, Spoliti M and Ramonda F 1997J. Chem. Soc., Perkin Trans. 2 2445Google Scholar
  8. 8.
    Ranondo F and Bencivenni L 1995J. Chem. Soc., Perkin Trans. 2 1797Google Scholar
  9. 9.
    Nakamoto K 1970Infrared spectra of inorganic and coordination compounds 2nd edn (New York: Wiley Interscience)Google Scholar
  10. 10.
    Daniels T, Wendlandt W W and Gallagher P K 1973Thermal analysis (New York: Wiley)Google Scholar
  11. 11.
    Lever A B P 1984Inorganic electronic spectroscopy 2nd edn (Amsterdam: Elsevier)Google Scholar
  12. 12.
    Lewis J and Wilkins R G 1960Modern coordination chemistry (New York: Interscience) pp 435–442Google Scholar

Copyright information

© Indian Academy of Sciences 2003

Authors and Affiliations

  1. 1.Department of Chemistry, University College for WomenOsmania UniversityHyderabadIndia

Personalised recommendations