Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 122, Issue -, Pages 365-374Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2013.11.079
Keywords
Copper(II) complexes; Acyclic Schiff's base; Anti bacterial activity; DNA binding and cleavage studies; Electrochemical studies
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Funding
- Department of Science and Technology, New Delhi [DST-SR/FT/CS-049/2009]
- National Research Foundation of Korea [22A20130000173] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The mononuclear copper(II) complexes (1&2) of ligands L-1 [N,N'-bis(2-hydroxy-5-methylbenzyl)-1,4-bis(3-iminopropyl)piperazine] or L-2 [N,N'-bis(2-hydroxy-5-bromobenzyl)-1,4-bis(3-iminopropyl)piperazine] have been synthesized and characterised. The single crystal X-ray study had shown that ligands L-1 and L-2 crystallize in a monoclinic crystal system with P2(1)/c space group. The mononuclear copper(II) complexes show one quasireversible cyclic voltammetric response near cathodic region (-0.77 to -0.85 V) in DMF assignable to the Cu(II)/Cu(I) couple. Binding interaction of the complexes with calf thymus DNA (CT DNA) investigated by absorption studies and fluorescence spectral studies show good binding affinity to CT DNA, which imply both the copper(II) complexes can strongly interact with DNA efficiently. The copper(II) complexes showed efficient oxidative cleavage of plasmid pBR322 DNA in the presence of 3-mercaptopropionic acid as reducing agent through a mechanistic pathway involving formation of singlet oxygen as the reactive species. The Schiff bases and their Cu(II) complexes have been screened for antibacterial activities which indicates that the complexes exhibited higher antimicrobial activity than the free ligands. (C) 2013 Elsevier B.V. All rights reserved.
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