October 2010
The ground state structure and properties of erythritol in gas phase and in different solvents: A DFT / SC-IPCM approach
Quantum mechanical study of the ground state structure and properties of erythritol was carried out in gas phase and in different solvents at the hybrid B3LYP DFT level with complete geometry optimization and varying basis sets [6-311G (d,p) and 6-311++G (d,p)] in order to provide detailed information of the model molecule in solvents of low, medium and high dielectric constant. It was found that the molecule is...
October 2010
Synthesis and characterization of a novel ionic liquid (TBA-AMPS) and its applications in Mannich condensation reactions under solvent free conditions
This paper deals with the synthesis and characterization of a novel ionic liquid using green chemicals such as tetra-butyl ammonium chloride (TBA) and 2-acrylamido-2-methylpropanesulphonate (AMPS) via an anion metathesis reaction and characterization by 1H-NMR technique. Also, this ionic liquid was used to catalyze Mannich reactions under solvent free conditions to afford the corresponding β- amino...
October 2010
Solvent effects and photophysical studies of ADS560EI laser dye
The ground state (μg) and the excited state (μe) dipole moments of a laser dye ADS560EI is estimated in various solvents by Lippert, Backshieve, Kawski-Chamma-Viallet, McRae and Suppan equations using the variation of stokes shift with the solvent dielectric constant and refractive index. The excited state dipole moments were also calculated by using the variation of stokes shift with microscopic solvent polarity...
October 2010
Natural rubber/organoclay nanocomposites: Effect of filler dosage on the physicomechanical properties of vulcanizates
Natural rubber/organoclay nanocomposites of varying filler loading [2 to 10 per hundred rubber (phr)] using derivative of tea (Camellia sinensis) seed oil were prepared by melt intercalation. Effects of filler dosage on the physicomechanical properties of the natural rubber (NR) vulcanizates were examined. Results of the mechanical properties indicates that tensile strength and tear properties of the modified...
October 2010
Comparative phytochemical and antimicrobial screening of some solvent extracts of Samanea saman (fabaceae or mimosaceae) pods
Antimicrobial activity of distilled water (DE), methanol (ME), ethanol (EE) and ethyl acetate (EAE) extracts of Samanea saman pods was investigated by well-diffusion method against five pathogenic organisms: Bacillus subtilis (B. subtilis), Staphylococsus aureus (S. aureus), Escherichia coli (E. coli), Pseudomonas aeruginosa (P. aeruginosa) and Candida albicans (C. albicans). Only ME showed measurable...
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