Journal of Chemical Sciences

, Volume 129, Issue 5, pp 609–622 | Cite as

DNA interactions and biocidal activity of metal complexes of benzothiazole Schiff bases: synthesis, characterization and validation

  • Narendrula Vamsikrishna
  • Marri Pradeep Kumar
  • Gali Ramesh
  • Nirmala Ganji
  • Sreenu Daravath
  • Shivaraj
Regular Article


Binary complexes of Cu(II), Ni(II) and Co(II) were synthesized using two novel Schiff bases \(\mathbf{L}_{1}\) = 2-(-(benzothiazol-6-ylimino)methyl)-4-chlorophenol (BTEMCP), \(\mathbf{L}_{2}\) = 2-(-(benzothiazol-6-ylimino)methyl)-4-nitrophenol. The Schiff bases and metal complexes were characterized by analytical and spectral methods like elemental analysis, Mass, \(^{1}\hbox {H}\)-NMR, \(^{13}\hbox {C}\)-NMR, UV-Vis, IR, ESR, SEM, EDX, XRD and magnetic susceptibility measurements. From the analytical data, square planar geometry has been proposed for all the metal complexes. The binding interaction between the metal complexes and DNA was investigated by means of electronic absorption, fluorescence spectroscopy and viscosity measurements. The DNA cleavage ability of the metal complexes was also evaluated by agarose gel electrophoresis method. These studies revealed that the complexes showed an intercalative mode of binding to CT DNA and also effectively cleaved the supercoiled pBR DNA. The synthesised compounds were evaluated for in vitro antibacterial activity against Gram positive and Gram negative bacteria, and found that the metal complexes showed more potent biocidal activity than the Schiff bases.

Graphical Abstract.

SYNOPSIS Six mononuclear metal complexes of benzothiazole Schiff bases were synthesized and characterized. The DNA interaction studies showed that all the complexes bind with CT-DNA through an intercalative mode. Supercoiled pBR322 DNA was effectively cleaved by the complexes . All the metal complexes exhibited better antibacterial activity than the Schiff bases from which they were prepared.


Schiff base binary complex DNA binding cleavage fluorescence viscosity 



We express our sincere and heartfelt thanks to the Head, Department of Chemistry for providing the necessary facilities. We are thankful to the Director, CFRD, Osmania University, Hyderabad, and the Director, IICT, Hyderabad, and the SAIF, IIT Bombay for providing spectral and analytical data. We are also thankful to CSIR, New Delhi, DST-SERB, DST-PURSE, DST-FIST and UGC-UPE (FAR) for providing financial assistance. Funding was provided by Council for Scientific and Industrial Research (Grant No. 09/132(0799)/2012-EMR-I).

Supplementary material

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Supplementary material 1 (docx 4588 KB)


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Copyright information

© Indian Academy of Sciences 2017

Authors and Affiliations

  • Narendrula Vamsikrishna
    • 1
  • Marri Pradeep Kumar
    • 1
  • Gali Ramesh
    • 1
  • Nirmala Ganji
    • 1
  • Sreenu Daravath
    • 1
  • Shivaraj
    • 1
  1. 1.Department of ChemistryOsmania UniversityHyderabadIndia

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