Department of Chemistry
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Item SORPTION CHARACTERISTICS OF AGRO WASTE PRODUCT IN THE REMOVAL OF LEAD (II)(Elsevier, 2008-03) Muthulakshmi Andal N; Shyamaladevi NA study was conducted to investigate the sorption capacity of saw, an agro waste product for the removal of lead(II)(Pb)(II) from aqueous systems. Commercially available saw dust were purchased from small-scale domestic units, such as furniture mart and varying concentrations of Pb(II) were used for Pb(II)-SD system. The study involved adding 75 mg of particles size of saw dust into iodine flasks, which contained 50 ml of the 10 mg/liter adsorbate. Pb solutions were filtered and analyzed for the residual concentration, using Atomic Absorption Spectrophotometer. The absorption investigations were carried out, by varying the particle size, contact time, initial concentration, dosage, pH of the medium, influence of cations, anions, co-ions, and the effect of temperature. It was observed that the sorption rate for the Pb(II) saw dust system were dependent on the availability of active surface sites on the adsorbentItem SYNTHESIS AND ANTIBACTERIAL ACTIVITIES OF SOME 2-AMINO-4-(1, 1′-BIPHENYL-4-YL)-6-ARYL-6H-1, 3-THIAZINES(Journal of Sulfur Chemistry, 2007-02-01) N, Ingarsal; P, Amutha; S, NagarajanA series of new 2-amino-4-(1,1′-biphenyl-4-yl)-6-aryl-6H-1,3-thiazines has been synthesized, characterized by IR, 1H NMR, 13C NMR, mass and elemental analyses and evaluated for in vitro antibacterial activity against some Gram-positive and Gram-negative bacteria. The antibacterial data revealed that the compounds had better activity against tested organisms than the reference norfloxacin.Item ADSORPTION AND EQUILIBRIUM STUDIES ON REMOVAL OF COPPER(II) BY CHITIN(Journal of the Indian Chemical Society, 2005) Karthikeyan G; Muthulakshmi Andal N; Anbalagan KThe adsorption of Cu2+ ions by chitin was studied in alkaline, neutral and acidic media and also under different experimental conditions like contact time, particle size of the adsorbent, pH of the medium and temperature to establish the optimum conditions. The effect of temperature on the adsorption process was verified by batch equilibration method. The experimental results revealed that the adsorption occurred as a spontaneous one. The equilibrium and activation parameters of the adsorption reaction were determined to assess the nature of adsorption. The adsorption increased with temperature. The results imply that the adsorption process is endothermic and spontaneous.Item ADSORPTION STUDIES OF IRON(III) ON CHITIN(Journal of Chemical Sciences, 2005) Karthikeyan G; Muthulakshmi Andal N; Anbalagan KAdsorption of ferric ions by chitin was studied by the batch equilibration method. The influence of particle size and dosage of the adsorbent, contact time, initial concentration of the adsorbate and temperature were experimentally verified. The effect of anions like chloride, nitrate and sulphate and also of cations like zinc, chromium and copper on the adsorption of iron(III) was determined. The time dependence of fraction of adsorption, Yt, at varying particle sizes and doses of chitin and the intraparticle diffusion rate constants, kp, of the adsorption process were calculated. Thermodynamic and equilibrium parameters of the reaction were determined to understand the sorption behavior of chitin. The results revealed that the adsorption of iron(III) by chitin is spontaneous, endothermic and favourable.Item ADSORPTION DYNAMICS AND EQUILIBRIUM STUDIES OF ZN(II) ONTO CHITOSAN(Journal of Chemical Sciences, 2004) Karthikeyan G; Anbalagan K; Muthulakshmi Andal NBatch equilibration studies are conducted to determine the nature of adsorption of zinc (II) over chitosan. The factors affecting the adsorption process like particle size, contact time, dosage, pH, effects of chloride and nitrate are identified. The influence of temperature and co-ions on the adsorption process is verified. The fraction of adsorption, Ytand the intraparticle diffusion rate constant, kpare calculated at different environments and the results are discussed. The nature of adsorption of the zinc (II)-chitosan system is explained using Freundlich, Langmuir isotherms and thermodynamic parametersItem FACILE SYNTHESIS OF 2-AMINO-5,6,7,8-TETRAHYDRO-5,7-DIARYLPYRIDO[4,3-D]PYRIMIDIN-4-OLS(Taylor & Francis, 2009-08-12) P, Amutha; S, Nagarajan2-Amino-5,6,7,8-tetrahydro-5,7-diarylpyrido[4,3-d]pyrimidin-4-ols were synthesized from various ethyl 2,6-diaryl-4-oxopiperidin-3-carboxylates with guanidine hydrochloride in presence of sodium ethoxide.Item INCLUSION COMPLEXES OF 3,4-DIHYDROPYRIMIDIN-2-(1H)-ONES WITH Β-CYCLODEXTRIN(Bulgarian Chemical Communications, 2008) K, Selvambigai; P, AmuthaQualitative aspects of the inclusion complexes of dihydropyrimidin-2-ones with β-cyclodextrin were studied in solidstate by Infrared Spectroscopy (IRS), Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy(SEM). The complexes were also investigated in solution by nuclear magnetic resonance spectroscopy (1H-NMR and13C-NMR). Qualitative modifications in the number of peaks (or bands) obtained and their shifts after complexation inthe spectral methods as well as thermal analysis indicated the inclusion, show that the method of synthesis is suitablefor obtaining inclusion complexes.Item SYNTHESIS, IN VITRO ANTIBACTERIAL AND ANTIFUNGAL EVALUATIONS OF 2-AMINO-4-(1-NAPHTHYL)-6-ARYLPYRIMIDINES(Elsevier, 2007-04) N, Ingarsal; G, Saravanan; P, Amutha; S, NagarajanA series of 2-amino-4-(1-naphthyl)-6-arylpyrimidines have been synthesized and characterized by IR, NMR, MS, elemental analyses and evaluated for in vitro antibacterial and antifungal activities. Some of the compounds were found to be active against a limited panel of bacteria and fungi. In particular, compounds 4b and 4e were found to be the most effective analogs against the tested bacterial and fungal strainsItem SYNTHESIS AND ANTIBACTERIAL ACTIVITIES OF SOME 2-AMINO-4-(1,1'-BIPHENYL-4-YL)-6-ARYL-6H-1,3-THIAZINES(Taylor & Francis, 2007-02-01) N, Ingarsal; P, Amutha; S, NagarajanA series of new 2-amino-4-(1,1′-biphenyl-4-yl)-6-aryl-6H-1,3-thiazines has been synthesized, characterized by IR, 1H NMR, 13C NMR, mass and elemental analyses and evaluated for in-vitro antibacterial activity against some Gram-positive and Gram-negative bacteria. The antibacterial data revealed that the compounds had better activity against tested organisms than the reference norfloxacin.Item 3-HYDROXY-2-NAPHTHOATE COMPLEXES OF TRANSITION METALS WITH HYDRAZINE - PREPARATION, SPECTROSCOPIC AND THERMAL STUDIES(E-Journal of Chemistry, 2009-08-10) Arunadevi N; Vairam SReaction of hydrazine and 3-hydroxy-2-naphthoic acid with some transition metal ions forms two types of complexes: (i) [M(N2H4 ){C10H6 (3- O)(2-COO)(H2O)2 ] where M=Ni, Co, Cd and Zn, at pH 9 and (ii) [M(N2H5 )2{C10H6 (3-O)(2-COO)}2 ].xH2O where M=Ni & x =1; M=Co, Cd, Mn& x=3; and M=Zn, Cu & x =0 at pH 4. Analytical data confirms the compositions of the complexes. The acid shows dianionic nature in these complexes. The magnetic moments and electronic spectra suggest the geometry of the complexes. IR data indicates the nature of hydrazine and presence of water in the complexes. Simultaneous TG-DTA studies shows different thermal degradation patterns for the two types of complexes. The first type shows formation of no stable intermediates whereas the second type shows the respective metal hydroxynaphthoate intermediates. The final products in both the types are found to be metal oxides of nano size. XRD patterns show isomorphism among the complexes with similar molecular formulae.
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