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Antimicrobial and Antioxidant Activities of New Metal Complexes Derived from 3-Aminocoumarin
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia
Biotechnology Division, Applied Science Department, University of Technology, Baghdad 10066, Iraq
* Author to whom correspondence should be addressed.
Received: 20 June 2011; in revised form: 14 July 2011 / Accepted: 15 July 2011 / Published: 15 August 2011
Abstract: 3-Aminocoumarin (L) has been synthesized and used as a ligand for the formation of Cr(III), Ni(II), and Cu(II) complexes. The chemical structures were characterized using different spectroscopic methods. The elemental analyses revealed that the complexes where M=Ni(II) and Cu(II) have the general formulae [ML2Cl2], while the Cr(III) complex has the formula [CrL2Cl2]Cl. The molar conductance data reveal that all the metal chelates, except the Cr(III) one, are non-electrolytes. From the magnetic and UV-Visible spectra, it is found that these complexes have octahedral structures. The stability for the prepared complexes was studied theoretically using Density Function Theory. The total energy for the complexes was calculated and it was shown that the copper complex is the most stable one. Complexes were tested against selected types of microbial organisms and showed significant activities. The free radical scavenging activity of metal complexes have been determined by measuring their interaction with the stable free radical DPPH and all the compounds have shown encouraging antioxidant activities.
Keywords: 3-aminocoumarin; antimicrobial; complexes; DPPH; scavenging
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Kadhum, A.A.H.; Mohamad, A.B.; Al-Amiery, A.A.; Takriff, M.S. Antimicrobial and Antioxidant Activities of New Metal Complexes Derived from 3-Aminocoumarin. Molecules 2011, 16, 6969-6984.
Kadhum AAH, Mohamad AB, Al-Amiery AA, Takriff MS. Antimicrobial and Antioxidant Activities of New Metal Complexes Derived from 3-Aminocoumarin. Molecules. 2011; 16(8):6969-6984.
Kadhum, Abdul Amir H.; Mohamad, Abu Bakar; Al-Amiery, Ahmed A.; Takriff, Mohd S. 2011. "Antimicrobial and Antioxidant Activities of New Metal Complexes Derived from 3-Aminocoumarin." Molecules 16, no. 8: 6969-6984.