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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 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, 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 DEVELOPMENT OF POLY(GLYCEROL SUBERATE) POLYESTER (PGS)–PVA BLEND POLYMER ELECTROLYTES WITH NH4SCN AND ITS APPLICATION(Springer Link, 2018-02-28) Nusrath Unnisa, C; Chitra, S; Selvasekarapandian, S; Monisha, S; Nirmala Devi, G; Moniha, V; Hema, MBesides commercially available synthetic polymers, the present work has been undertaken to explore the significance of poly(glycerol suberate) (PGS) polyester synthesised under lab scale in energy storage device. In this regard, a blend polymer electrolyte comprising of polyvinyl alcohol (PVA), poly(glycerol suberate) (PGS) polyester along with the various proportions of ammonium thiocyanate (NH4SCN) was prepared adopting solution casting technique. The synthesised polyester PGS was characterised by Fourier transform infrared (FT-IR) spectroscopy, 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. The prepared electrolyte film was subjected to FT-IR analysis to study the complexation that has occurred within the blend. Its amorphous nature was revealed from X-ray diffraction (XRD) studies. Influence of NH4SCN on the glass transition temperature (Tg) was drawn from differential scanning calorimetry (DSC) technique. The dispersion of dopant within the polymer matrix was supported by scanning electron microscopy (SEM) followed by its elemental composition from energy dispersive spectroscopy (EDS). From the AC impedance technique, maximum conductivity of 3.01 × 10−4 S cm−1 was elicited for the optimised electrolyte (1 g PVA + 0.75 g PGS + 0.6 g NH4SCN). Frequency-dependent dielectric and modulus spectra were analysed to study the mechanism of transportation. Transport parameters evaluated by Wagner’s polarisation method proved that the conductivity was predominantly due to cations. Proton conducting battery was configured with the highest conducting electrolytic film and its cell parameters are presented.Item SYNTHESIS, CHARACTERIZATION AND BIOLOGICAL INVESTIGATIONS OF NOVEL SCHIFF BASE LIGANDS CONTAINING IMIDAZOLINE MOIETY AND THEIR CO(II) AND CU(II) COMPLEXES(Elsevier, 2018-08-05) Radha, V P; Jone Kirubavathy, S; Chitra, SNovel imidazoline based Schiff base ligands L1 and L2 were synthesized from o-phenylenediamine/o-aminophenol with creatinine. The ligands were complexed with Co(II) and Cu(II) by direct reaction with metal salts. The synthesized ligands and the metal complexes were characterized by elemental analysis, FT-IR, 1H NMR, mass, electronic, thermal analyses, conductivity and magnetic susceptibility measurements. The conductivity measurements showed the non-electrolytic nature of the complexes. The thermogravimetric analyses confirmed the presence of lattice and coordinated water molecules in the complexes. The DFT calculations were carried out at B3LYP/6-31G(d,p) level for the determination of the optimized structure of the ligands. The synthesized ligands and the metal complexes were screened for their antimicrobial activity against two gram positive bacteria (Staphylococcus aureus and Bacillus subtilis) and two gram negative bacteria (Escherichia coli and Pseudomonas aeruginosa) and two fungal strains (Aspergillus niger and Candida albicans). The outcomes revealed that the metal complexes showed pronounced activity than the ligands.