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Item SYNTHESIS, CHARACTERIZATION, SINGLE CRYSTAL XRD, IN VITRO ANTIMICROBIAL AND CYTOTOXICITY STUDY OF TRIS(ETHYLENEDIAMINE)COBALT(III)CHLORIDE OXALATE TRIHYDRATE(Elsevier B.V, 2019-11) Jone Kirubavathy, S; Velmurugan, R; Parameswari, K; Chitra, SThe complex tris(ethylenediamine)cobalt(III)chloride oxalate trihydrate [Co(en)3]Cl(C2O4)·3H2O crystallizes in the monoclinic space group C2/c with the following unit cell parameters a = 19.9318 (13), b = 9.3344 (4), c = 19.0881 (13) Å β = 96.846(3)°, Z = 8. The crystal structure was solved by direct methods and refined by full matrix least squares procedures to a final R value of 0.0314 for 4330 observed reflections. The reported cobalt complex is six co-ordinated through amine nitrogen with distorted octahedral geometry. There are uncoordinated chloride and oxalate ions along with the water molecules. In-vitro antimicrobial activity was studied against various test organisms and found to be good. From in-vitro cytotoxic activity of the synthesized complex, the IC50 value was found to be 55.85 μg/ml.Item THE INFLUENCE OF BENZOYL HYDRAZINE AND SOME OF ITS SUBSTITUENTS ON CORROSION INHIBITION OF CARBON STEEL IN SULPHURIC ACID SOLUTION(Emerald Publishing Limited, 2004-12-01) Gowrani, T; Yamuna, J; Parameswari, K; Chitra, S; Selvaraj, A; Subramania, AThe influence of synthesised benzoyl hydrazine and some of its substituents on the inhibition of corrosion of carbon steel in 1M sulphuric acid solution were investigated using weight loss, gasometric measurements, potentiodynamic polarisation studies and impedance measurements. Corrosion kinetic parameters clearly revealed the fact that the inhibition of corrosion of carbon steel by these compounds was under mixed control. The effect of temperature on the corrosion behaviour of carbon steel in 1M H2SO4 with optimum concentration of inhibitors was studied in the temperature range 40°‐60°C. The activation energy (Ea) and free energy of adsorption (ΔGads0) were determined for all the inhibitors. The adsorption of these compounds on the carbon steel surface from 1M H2SO4 was observed to obey the Langmuir adsorption isotherm relationship.Item SYNTHESIS AND COMPARATIVE STUDY OF THE INHIBITIVE PROPERTIES OF ISOMERIC SCHIFF BASES AND ITS CYCLISATION PRODUCTS(Journal of Corrosion Science and Engineering, 2006) Thamaraiselvi, N; Parameswari, K; Chitra, S; Selvaraj, AThe corrosion behaviour of mild steel in 1M sulphuric acid solution and its inhibition by Schiff bases and thiazolidinones was studied using weight loss method at various temperatures (303-333K), by electrochemical and non - electrochemical techniques. The percentage inhibition efficiency of the inhibitors increased with increase in inhibitor concentration. Potentiodynamic polarization studies revealed that though the Schiff bases and thiazolidinones act as mixed type inhibitors they are slightly anodic in nature. Adsorption of these inhibitors on the mild steel surface followed the Langmuir adsorption isotherm. The thermodynamic parameters such as activation energy (Ea) and free energy of adsorption (ΔG°ads) were calculated. The synergistic effect of halide ions on the inhibition efficiency of thiazolidinones was also studied.Item EFFECT OF AZLACTONES ON CORROSION INHIBITION OF MILD STEEL IN ACID MEDIUM(Journal of Applied Sciences Research, 2010) Parameswari, K; Chitra, S; Nusrath Unnisa, C; Selvaraj, AThe inhibition efficiency of azlactones on corrosion behaviour of mild steel in 1M H2SO4 has been evaluated using weight loss, gasometry and atomic absorption spectroscopy techniques which shows increase in inhibition efficiency with increase in concentration.Effect of temperature strongly ensures stronger physisorption of the compounds, which obeys Langmuir adsorption isotherm. The inhibition efficiency has been synergistically enhanced by the addition of halide ions. The kinetic corrosion parameters analysed in terms of impedance data shows a satisfactory agreement with those obtained by potentiodynamic polarisation method.Item A COMPARATIVE STUDY OF THE CORROSION INHIBITIVE PROPERTIES OF PYRIMIDINE DERIVATIVES FOR MILD STEEL (Article)(Hindawi, 2009-03-31) Sathya, P; Parameswari, K; Chitra, S; Selvaraj, AThe influence of pyrimidine derivatives on the corrosion inhibition of mild steel in 1 M H2SO4 was studied using weight loss and electrochemical techniques. These compounds act as good corrosion inhibitors even at low concentration and the inhibition efficiency increased with the increase in inhibition concentration. The corrosion rates have been determined at various temperatures (303-333K) by weight loss measurements. The Rt values obtained from EIS method increased with increase in inhibitor concentration. The potentiostatic polarization results clearly revealed that the inhibitors behave as a mixed type but slightly anodic in nature. The adsorption process was found to obey the Langmuir adsorption isotherm. The synergistic effect of halide ion on the inhibition efficiency increase with increase concentration.Item A COMPARATIVE STUDY OF THE CORROSION INHIBITIVE PROPERTIES OF PYRIMIDINE DERIVATIVES FOR MILD STEEL(Hindawi, 2009-03-31) Sathya, P; Parameswari, K; Chitra, S; Selvaraj, AThe influence of pyrimidine derivatives on the corrosion inhibition of mild steel in 1 M H2SO4 was studied using weight loss and electrochemical techniques. These compounds act as good corrosion inhibitors even at low concentration and the inhibition efficiency increased with the increase in inhibition concentration. The corrosion rates have been determined at various temperatures (303-333K) by weight loss measurements. The Rt values obtained from EIS method increased with increase in inhibitor concentration. The potentiostatic polarization results clearly revealed that the inhibitors behave as a mixed type but slightly anodic in nature. The adsorption process was found to obey the Langmuir adsorption isotherm. The synergistic effect of halide ion on the inhibition efficiency increase with increase concentration.Item DIANILINE SCHIFF BASES AS INHIBITORS OF MILD STEEL CORROSION IN ACID MEDIA(Elsevier, 2010-11) Chitra, S; Parameswari, K; Selvaraj, AA new class of corrosion inhibitors namely dianiline Schiff bases was synthesized and its inhibiting action on the corrosion of mild steel in 1M sulphuric acid at 30°C was investigated by various corrosion monitoring techniques. A preliminary screening of the inhibition efficiency was carried out using weight loss measurements. Potentiodynamic polarization studies showed that the Schiff bases were mixed type inhibitors. The effect of temperature on the corrosion behaviour of mild steel in 1M sulphuric acid with the addition of the Schiff bases was studied in the temperature range from 40°C60°C. The adsorption of these compounds on a mild steel surface from sulphuric acid obeyed the Langmuir adsorption isotherm. The decrease in inhibition efficiency with increase in temperature and the less negative ∆G°ads values suggest predominant physisorption of the Schiff base molecules on the steel surface.Item ISOXAZOLINE DERIVATIVES AS INHIBITORS FOR MILD STEEL CORROSION IN 1M H2SO4: COMPUTATIONAL AND EXPERIMENTAL INVESTIGATIONS(Springer Link, 2022-03-16) Anusuya, N; Saranya, J; Benhiba, F; Warad, I; Zarrouk, A; Chitra, SThe isoxazoline derivatives namely 3-phenylamino-5-(3′-methoxy-4′-hydroxyphenyl) isoxazoline (PAMHI), 3-phenylamino-5-(4′-methoxyphenyl)isoxazoline (PAMI) and 3-phenylamino-5-(4′-hydroxyphenyl)isoxazoline (PAHI) were synthesized and tested for their inhibition capacity against the mild steel (MS) corrosion in 1 M H2SO4. Their inhibition performance toward MS has been studied through well-known methods namely weight loss (WL), electrochemical and surface analysis. The inhibition efficiency of PAMHI was 95.90% at 10mM concentration. The adsorption studies indicated that the isoxazoline derivatives obeyed Langmuir adsorption isotherm on the mild steel surface, and Gibbs free energy values were in the range of -32.05, -28.52 and -33.44 kJ mol-1. These results suggested that the inhibitor molecules interacted with the mild steel surface through mixture adsorption. Also, mixed type behavior was observed for the studied inhibitors from polarization studies. The presence of a protective layer of organic matter was validated by scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. Density-functional theory (DFT) method and molecular dynamics (MD) simulation have been studied and the results shown that the inhibitory efficiencies of the three molecules tested are almost the same.Item AMINOTHIAZOLYL COUMARIN DERIVATIVES AS EFFECTUAL INHIBITORS TO ALLEVIATE CORROSION ON MILD STEEL IN 0.5 M H2SO4(Springer Link, 2021-06-21) Mahalakshmi, D; Saranya, J; Benhiba, F; Zarrouk, A; Chitra, STo diminish corrosion which leads to structural damages and to implement a green mitigator has induced the usage of aminothiazolyl coumarin derivatives to study mild steel (MS) corrosion using potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), weight loss, atomic force microscopy (AFM), and electron microscopy with energy dispersive spectroscopy (SEM–EDS) spectrometry in acid medium. The results showed that the inhibition efficiency was 90.8% for the least effective inhibitor and 97.1% for the most effective inhibitor at optimal concentration (10 mM). Enhancement of inhibition efficiency in weight loss method and increase in Rp values in impedance and mixed nature of the inhibition in polarization measurement reveals the best inhibition capacity of coumarins over the MS. The coumarins were characterized using FT-IR, NMR and Mass spectroscopy. The adsorption was well fitted with the Langmuir adsorption isotherm model. SEM–EDS and AFM images confirmed the shielding effect of coumarin derivatives through a layer formation on MS against acid medium. The adsorption mechanism of aminothiazolyl coumarin derivatives was further explored by quantum chemical calculations (DFT) and molecular dynamics (MD).Item SYNTHESIS, CHARACTERIZATION, DFT, IN-VITRO ANTI-MICROBIAL, CYTOTOXICITY EVALUATION, AND DNA BINDING INTERACTIONS OF TRANSITION METAL COMPLEXES OF QUINOXALINE SCHIFF BASE LIGAND(Elsevier, 2020) Jone Kirubavathy, S; Chitra, SA series of Cr(III), Mn(II), Fe(III), Co(II), Cu(II) and Ni(II) transition metal complexes of the quinoxaline based Schiff base ligand were synthesized and characterized on the basis of analytical, conductance, magnetic moment, FT-IR, NMR, ESR, EDAX and electronic spectral data. The ligand behaves as bidentate OO donors through phenolic oxygen and carbonyl oxygen in the quinoxaline ring. The molecular structure of the quinoxaline Schiff base ligand and Cu(II) complex was investigated theoretically. The optimized molecular structure was obtained from Gaussian 09 program. The antimicrobial activity of the ligand and the complexes were screened for various bacterial and fungal strains and found to be good for Co(II) and Mn(II) complexes and moderate for the other synthesized complexes. The minimum inhibitory concentration of the Co(II) and Mn(II)complexes against S. aureus, S. paratyphi and A. niger were found to be 250 μg/ml, 125 μg/ml, 500 μg/ml and 250 μg/ml, 250 μg/ml , 500 μg/ml respectively. The anti-cancer activity of the ligand and the complexes were studied against the human breast cancer cell lines MCF-7 and found to be good for Cu(II), Co(II) and Mn(II) complexes. The in-vitro anti-oxidant activities of the complexes and found to be moderate for all complexes. The DNA binding ability of the complexes were checked and their binding constants were reported using absorption and emission spectral studies.