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dc.contributor.authorBegum, M S Ameerunisha-
dc.contributor.authorSaha, Sounik-
dc.contributor.authorHussain, Akhtar-
dc.contributor.authorChakravarty, Akhil R-
dc.description.abstractA copper(II) complex of dipyridophenazine, viz., [Cu(dppz)₂ (H₂O)](ClO₄)₂ (1), has been prepared and structurally characterized by X-ray crystallography. The crystal structure of the complex shows a five-coordinate structure in which two N,N-donor dipyridophenazine (dppz) and one aqua ligand bind to the copper(II) center giving Cu-O and Cu-N bond distances in the range of 1.981(6) to 2.043(6) Å. The ESI-MS spectrum of 1 in MeCN shows a peak at m/z value of 313 (100%) indicating the dissociation of the aqua ligand in the solution phase. The complex is one-electron paramagnetic (μeff, 1.86 μB). It displays a quasi-reversible Cu(II)/Cu(I) redox process at 0.096 V. The complex is an avid binder to CT DNA giving a binding constant value of 3.5 × 10⁵ M⁻¹. It shows significant hydrolytic cleavage of supercoiled pUC19 DNA in dark in the absence of any external agents. The complex exhibits chemical nuclease activity on treatment with 3-mercaptopropionic acid as a reducing agent forming hydroxyl radicals. Complex 1 is a model synthetic nuclease and hydrolase showing both modes of DNA cleavage under different reaction conditions. The DNA cleavage activity of 1 is significantly better than its phen analogue but similar to that of the bis-dpq complex.en_US
dc.relation.ispartofseriesInt. Cl. ⁸ C07F1/08; C12N15/00en_US
dc.sourceIJCA Vol.48A(1) [January 2009]en_US
dc.subjectBioinorganic chemistryen_US
dc.subjectHydrolytic cleavageen_US
dc.subjectDNA cleavageen_US
dc.subjectDNA bindingen_US
dc.subjectCrystal structureen_US
dc.titleSynthesis, crystal structure and DNA cleavage activity of (aqua)bis(dipyridophenazine)copper(II) complexen_US
Appears in Collections: IJC-A Vol.48A(01) [January 2009]

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