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Articles by R. Jegadeesh
Total Records ( 2 ) for R. Jegadeesh
  S. Sreedaran , K. Shanmuga Bharathi , A. Kalilur Rahiman , R. Prabu , R. Jegadeesh , N. Raaman and V. Narayanan
  A series of unsymmetrical dicompartmental binuclear copper(II) complexes have been prepared by Schiff-base condensation of 1,8-[bis(3-formyl-2-hydroxy-5-bromo)benzyl]-l,4,8,11-tetraazacyclotetradecane (L) with aliphatic and aromatic diamines, copper(II) perchlorate and triethylamine. The complexes were characterized by elemental and spectral analysis. Electronic spectra of the complexes show d-d transitions in the range 663-786 nm. Electrochemical studies of the complexes in DMF show two irreversible one electron reduction processes  E1pc = -0.62 to -0.77 V and  E2pc = -0.94 to -1.17 V. Cryomagnetic investigations of the binuclear complexes show -2J values in the range of 154 to 236 cm-1. The rate constants for hydrolysis of 4-nitrophenylphosphate are in the range of 2.27 x10-2 to 9.21 x10-2 min-1 and for catecholase activity in the range of 3.06 x10-2 to 8.35 x10-2 min-1. All the complexes were screened for antifungal and antibacterial activity.
  M. Rajasekar , S. Sreedaran , R. Prabu , V. Narayanan , R. Jegadeesh , N. Raaman and A. Kalilur Rahiman
  Ni(II) and Cu(II) metal complexes of simple unsymmetrical Schiff-base ligands derived from salicylaldehyde/5-methylsalicylaldehyde and ethylenediamine or diaminomaleonitrile (DMN) were synthesized. The ligands and their complexes were characterized by elemental analysis, 1H NMR, FT IR, and mass spectroscopy. The electronic spectra of the complexes show d-d transitions in the region at 450-600 nm. Electrochemical studies of the complexes reveal that all mononuclear complexes show a one-electron quasi-reversible reduction wave in the cathodic region. ESR spectra of the mononuclear copper(II) complexes show four lines, characteristic of square-planar geometry, with nuclear hyperfine spin 3/2. The copper(II) complexes show a normal room temperature magnetic moment value μeff = 1.70-1.74 BM which is close to the spin only value of 1.73 BM. Kinetic studies on the oxidation of pyrocatechol to o-quinone using the copper(II) complexes as catalysts were also carried out. The in vitro antimicrobial activity of the investigated compounds was tested against human pathogenic bacterias such as Staphylococcus aureus, Bacillus subtilis, Klebsiella pneumonia, Pseudomonas aeruginosa and Escherichia coli. The antifungal activity was tested against Candida albicans. Generally, the metal complexes have higher antimicrobial activity than the free ligands.
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