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Journal of Fluorescence

, Volume 24, Issue 6, pp 1687–1699 | Cite as

Synthesis, Characterization, Antibacterial, DNA Binding and Cleavage Studies of Mixed Ligand Cu(II), Co(II) Complexes

  • B. Ushaiah
  • D. Shiva leela
  • Mudavath Ravi
  • B. Anupama
  • Shyam Perugu
  • C. Gyana KumariEmail author
ORIGINAL PAPER

Abstract

Mixed-ligand Cu(II), Co(II) complexes of formulae [Co(NSALT)(A.A)(H2O)](1), [Co(OHAPT)(A.A)H2O](2), and [Cu(ESALT)(ABPH)H2O] (3) were obtained by refluxing methanol solutions of copper, cobalt chlorides with the appropriate ligands. The complexes were characterized by the ESI-MASS, vibrational spectroscopy (Fourier transform-IR), 1H-NMR spectroscopy, UV–vis spectroscopy, TGA, ESR, SEM and powder XRD. The preliminary DNA-binding activity of the complexes was studied by recording electronic absorption spectra of the complexes in presence of CT-DNA. The binding constants of three complexes towards calf thymus DNA (CT-DNA) [1.2 × 104 M−1 for 1, 2.5 × 104 M−1 for 2, and 3.0 × 104 M−1 for 3] indicate strong interaction of 3. Changes in the fluorescence of ethidium bromide in the presence of DNA suggest intercalation into or electrostatic interactions with CT DNA. The quenching constants, KSV towards-DNA calculated through fluorescence spectra are 2.9 × 104 M−1for 1, 1.8 × 104 M−1 for 2, and 3.2 × 104 M−1 for 3. Docking studies on DNA complexes confirm the binding of 1 and 2 in the major groove of CT-DNA (CTP-1 Endonuclease). Moreover, the antibacterial effect of 1–3 against the five bacterial species was evaluated. The metal complexes have cleavage affinity towards PBR322 plasmid. Furthermore, the antioxidant activities of the complexes were determined by DPPH scavenging activity method.

Keywords

Metal complexes Anti oxidant Antimicrobial activity DNA binding Cleavage studies 

Notes

Acknowledgments

We thank to University grants commission (UGC, NEW Delhi, India) for financial support in the form of junior research fellow to me. We thank to HCU for extending the ESR facility and Department of Bio chemistry (Osmania university, Hyderabad) for microbial activity.

Supplementary material

10895_2014_1456_MOESM1_ESM.docx (1.4 mb)
ESM 1 (DOCX 1451 kb)

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • B. Ushaiah
    • 1
  • D. Shiva leela
    • 1
  • Mudavath Ravi
    • 1
  • B. Anupama
    • 2
  • Shyam Perugu
    • 3
  • C. Gyana Kumari
    • 1
    Email author
  1. 1.Department of ChemistryOsmania UniversityHyderabadIndia
  2. 2.Department of ChemistryR.B.V.R.R. Women’s CollegeHyderabadIndia
  3. 3.Department of Bio ChemistryOsmania UniversityHyderabadIndia

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