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1 Polish Journal of Chemistry

1 2007

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Synthesis, Characterization, DNA Binding and Cleavage Studies of Some Novel Biosensitive Transition Metal(II) Complexes

Raman R., Joseph J.

Polish Journal of Chemistry

2007

Vol. 81, nr 7

1303-1311

Four novel Knoevenagel type Cu(II), Ni(II), Co(II) and Zn(II) macrocyclic complexes derived from 3-cinnamalideneacetoacetanilide and N-(2-aminoethyl)-1,3-propanediamine have been synthesized. The nature of complexes and the geometry have been inferred from their microanalytical data, magnetic susceptibility measurements, IR, UV-Vis., 1H NMR, ESR and mass spectral techniques. The low electrical conductance of complexes supports their neutral nature.Monomeric nature of the complexes is assessed from theirmagnetic susceptibility values. The in vitro biological screening effects of the investigated compounds were tested against the bacteria E. coli, S. aureus, S. typhi and K. pneumoniae by the well diffusion method using agar nutrient as the medium. A comparative study of MIC values of the macrocyclic Schiff base ligand and its complexes indicates that the complexes exhibit higher antibacterial activity than the free ligand. The cyclic voltammetry method was used to probe the interaction of a Cu(II) complex with pUC18 DNA. Information of the binding ratio and intercalation mode can be obtained from its electrochemical data. Cyclic voltammetric measurements showed that Cu(II) complex undergoes a reversible reduction at biologically accessible potentials. From the study, it is understood that copper complex prefers to bind with DNAin Cu(II) rather than Cu(I) oxidation state. The DNAcleavage ability of the complexes was monitored by gel electrophoresis using super coiled pUC18 DNA in Tris-HCl buffer.