, 21:675 | Cite as

Binding and photocleavage of DNA by mixed ligand Co(III) and Ni(II) complexes of thiophene[2, 3-b] quinoline and phenanthrolie/bipyridine

  • Mustur C. Prabahkara
  • Halehatty S. Bhojya Naik


In order to systematically perform an experimental and theoretical study on DNA binding and photocleavage properties of transition metal complexes of the type [M(L)2(L1)](PF6)n · xH2O (where M = Co(III) or Ni(II), L = 1,10-phenanthroline or 2.2′ bipryidine, L1 = Thiophene [2,3-b] quinoline (qt), n = 3 or 2 and x = 5 or 2) have been synthesized and characterized by elemental analysis, IR, 1H NMR, UV and magnetic susceptibility data. The DNA-binding properties of these complexes have been investigated with UV-Vis, viscosity measurements, thermal denaturation and cyclic voltametric studies. It is experimentally found that all the complexes are bound to DNA via intercalation in the order [Co(bpy)2(qt)](PF6)3 > [Co(phen)2(qt)](PF6)3 > [Ni(phen)2(qt)](PF6)2 > [Ni(bpy)2(qt)](PF6)2. The photocleavage studies with pUC19 DNA shows that all these complexes promoted the conversion of SC form to NC form in absence of ‘inhibitors’.


Mixed ligand complexes Phenanthroline Bipyridine DNA binding Photocleavage 



Super coiled


Nicked circular


Deoxyribose nucleic acid


plasmid University of California



One of the author Prabhakara M.C. wish to thank Kuvempu University for providing Senior Research Fellowship and the Director, SIFC, IISc. Bangalore for Spectral data.


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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • Mustur C. Prabahkara
    • 1
  • Halehatty S. Bhojya Naik
    • 1
  1. 1.Department of P.G. Studies and Research in Industrial Chemistry, School of Chemical SciencesKuvempu UniversityShimogaIndia

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