1. Synthesis, structural characterization, antioxidant, antimicrobial, DNA incision evaluation and binding investigation studies on copper(II) and cobalt(II) complexes of benzothiazole cored Schiff bases.
- Author
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Daravath, Sreenu, Rambabu, Aveli, Vamsikrishna, Narendrula, Ganji, Nirmala, and Raj, Shiva
- Subjects
SCHIFF bases ,BENZOXAZOLES ,DNA ,MACROPHOMINA phaseolina ,BACILLUS amyloliquefaciens ,METAL complexes - Abstract
Three Schiff base ligands, L
1 H = (2-((benzo[d]thiazol-6-ylimino)methyl)-6-nitrophenol), L2 H = (2-((benzo[d]thiazol-6-ylimino)methyl)-4,6-diiodophenol), L3 H = (2-((benzo[d]thiazol-6-ylimino)methyl)-4-bromo-6-methoxyphenol) and their binary metal complexes, 1 [Cu(L1 )2 ], 2 [Co(L1 )2 ], 3 [Cu(L2 )2 ], 4 [Co(L2 )2 ], 5 [Cu(L3 )2 ] and 6 [Co(L3 )2 ], have been synthesized and characterized by elemental analysis, NMR, ESI mass, FT-IR, ESR, UV–Visible, magnetic susceptibility and TGA studies. The analytical and various spectral data suggested a square-planar geometry around the metal for all complexes with N2 O2 -donor atoms from the Schiff base ligands. Antimicrobial study was investigated against two Gram-positive, Bacillus amyloliquefaciens and Staphylococcus aureus, and one Gram-negative, Escherichia coli, bacteria as well as against two fungal species, Macrophomina phaseolina and Sclerotium rolfsii, by using Streptomycin and Mancozeb as standard drugs, respectively. The results revealed that metal complexes show more potent activity than free ligands and moderate compared to standard drugs. The free-radical scavenging ability of the complexes was evaluated by DPPH and ABTS assay methods using ascorbic acid as a standard antioxidant, complexes 1 and 2 showed good scavenging activity. DNA-binding titrations were also performed and indicated that all complexes bind to calf-thymus DNA via an intercalation mode. Additionally, the complexes exhibited good cleavage ability against the pBR322 DNA even at low concentrations in the presence of activators, H2 O2 as well as UV light. [ABSTRACT FROM AUTHOR]- Published
- 2019
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