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    STUDY OF SUBSTITUENT EFFECTS IN SUBSTITUTED DIBENZAL ACETONES
    (Journal of the Indian Chemical Society, 2006-10-16) Ananthakrishna Nadar, P; Renuga, V
    The present work involves a detailed study of the ultra-violet absorption spectra of various substituted dibenzylidene ketones derived from acetone, ethyl methyl ketone, diethyl ketone, cyclopentanone and cyclohexanone by condensing with several meta- and para-substituted benzaldehydes in n -hexane and in ethanol to ascertain the transition dominant in these solvents. These ketones exist as equilibrium mixtures of s-cis, cis and s-cis, trans conformations. The ultraviolet absorption spectra of the ketones exhibit two bands due to π*← π transition around 250 and 320 nm. The 320 nm band is prominent in all the cases. There is no indication of π* ← π transition in any of the spectra. The 320 nm band is structureless in all the cases except those shown by the dibenzylidene ketones derived from cyclopentanone in hexane. Therefore it can be inferred that the dibenzylide ketones derived from all the ketones except those derived from cyclopentanone are non-planar.
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    BIODEGRADATION OF LIGNOCELLULOSIC COIR PITH BY USING FUNGAL FORMS
    (EM International, 2006) Vinodhini, S; Padma Devi, S N; Padma, Srinivasan
    The present study deals with degradation of coir poll by Humicola sp. Trichoderma viride and Aspergillus terreus. The lignin, cellulose, organic carbon content and evolution of carbon-di-oxide were estimated in pith degraded aad non-degraded coir pith. The content of lignin and cellulose were found to be low in lignin and cellulose during different period of biodegradation.
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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.