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    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, S
    The 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.
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    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, A
    The 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.
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    ANTICORROSION PERFORMANCE OF SOME ARYLIDENE-5-PYRAZOLONES FOR MILD STEEL IN SULPHURIC ACID
    (Bulletin of Electrochemistry, 2005-05) Selvaraj, A; Sudha, K; Anuradha, R; Parameswari, K
    5-Pyrazolone and four of its 4-arylidene derivatives were synthesized from acetoacetic ester, hydrazine hydrate and aromatic aldehydes, and evaluated as corrosion inhibitors for mild steel by weight loss method, gasometry, polarization measurements and impedance studies. Piperonalidene pyrazolone showed the best results among all the compounds tested even at low concentrations. The compounds act as mixed type inhibitors and their adsorption on steel surface obeys the Langmuir isotherm. The effect of temperature on the corrosion behaviour of steel showed that the inhibition efficiency decreases with increase in temperature (303-333K). Ea and ΔG ads were determined. The synergistic effect due to I- ions on one of the aryldene pyrazolone has also been noted.
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    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, A
    The 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.
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    STUDY ON THE INHIBITION OF MILD STEEL CORROSION BY BENZOISOXAZOLE AND BENZOPYRAZOLE DERIVATIVES IN H2SO4 MEDIUM
    (Portugaliae Electrochimica Acta, 2010) Parameswari, K; Rekha, S; Subramanian, Chitra; Kayalvizhy, E
    Four heterocyclic compounds, namely 4- phenyl-5-acetyl/carbethoxy-3-methyl-6-hydroxyl-6-methyl-4,5,6,7-tetrahydro-2,1-benzoisoxazole and benzopyrazole (BIS1, BP1and BIS2, BP2), were synthesized and their influence on the inhibition of corrosion of mild steel in 1 M H2SO4 was investigated by means of weight loss, potentiodynamic polarization, electrochemical impedance (EIS) and scanning electron microscopy (SEM). The values of activation energy and free energy of adsorption of these compounds were also calculated. Adsorption obeys Langmuir adsorption isotherm. The IE of the compounds was found to vary with concentration and temperature. Synergistic effect was also investigated for the four compounds at 0.05 mM concentration by weight loss method in 1 M H2SO4 medium in presence of KI, KBr and KCl. Results obtained revealed that all the four compounds performed excellently as a corrosion inhibitor for mild steel in 1 M H2S04 and their efficiency attains more than 90% at 0.6 mM at 298 K. Polarisation studies showed them to be mixed type inhibitors.
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    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, A
    The 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.
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    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, A
    The 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.
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    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, A
    The 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.
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    DIANILINE SCHIFF BASES AS INHIBITORS OF MILD STEEL CORROSION IN ACID MEDIA
    (Elsevier, 2010-11) Chitra, S; Parameswari, K; Selvaraj, A
    A 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.
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    SYNTHESIS, CHARACTERIZATION, SINGLE CRYSTAL XRD, IN VITRO ANTIMICROBIAL AND CYTOTOXICITY STUDY OF TRIS(ETHYLENEDIAMINE)COBALT(III)CHLORIDE OXALATE TRIHYDRATE
    (Elsevier, 2019-11) Jone Kirubavathy, S; Velmurugan, R; Parameswari, K; Chitra, S
    The 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.