S. Kumar

Annamalai University, Anamalainagar, Tamil Nādu, India

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Publications (9)8.56 Total impact

  • IOSR Journal of Applied Physics 01/2014; 6(2):64-68. DOI:10.9790/4861-06226468 · 1.35 Impact Factor
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    ABSTRACT: Densities (ρ), viscosities (η) and refractive indices (nD) were measured for the binary mixtures of o- and m-chloroaniline with 2-alkoxyethanols like 2-methoxyethanol, 2-ethoxyethanol and 2-butoxyethanol at 303.15 K. From the experimental data, the values of excess molar volume (VE), deviation of viscosity (ηE), deviation of refractive index (ΔnD), excess molar refraction (RmE) and excess Gibbs free energy (ΔG⁎ E) for the six binary mixtures were calculated and the values are fitted with Redlich–Kister polynomial equation. The values of all calculated parameters of the binary mixtures and their deviations indicate a strong specific type of interaction between the amino group (single bondNH2) of chloroanilines with hydroxyl group (single bondOH) of 2-alkoxyethanols.
    Journal of Molecular Liquids 12/2013; 188(1):203-209. DOI:10.1016/j.molliq.2013.09.035 · 2.08 Impact Factor
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    ABSTRACT: The dielectric properties of aniline, o–chloroaniline and o–anisidine with carbon tetrachloride were calculated at 303.15 K. The Kirkwood correlation factor (g) described something about the orientational ordering of molecules in a liquid through the angular correlations of neighboring dipoles and hence it will give useful information about the local structure of the liquid. The calculated values of excess dielectric constant (εE), excess molar polarization (PE) and excess Helmholtz free energy (ΔFE) suggests that the structural behaviour and dipolar rotation of the binary liquid mixtures. The Bruggeman factor (fB) values are deviate from unity, which describe the interaction behaviour of the above said anilines in carbon tetrachloride. From all the studied systems indicates the solute–solvent type of interactions taking place
  • S. Kumar, P. Jeevanandham
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    ABSTRACT: Densities, viscosities and refractive indices have been measured for the binary mixtures of aromatic amines such as aniline and o-anisidine with 2-alkoxyethanols like 2-methoxyethanol, 2-ethoxyethanol and 2-butoxyethanol at 303.15 K. The excess properties are excess molar volume (VE), deviation of viscosity (ηE), deviation of refractive index (ΔnD), excess molar refraction (RmE) and excess Gibbs free energy (ΔG* E) for the six binary mixtures that were calculated and the values are fitted with Redlich–Kister polynomial equation. The measured refractive index values are analyzed by different theoretical mixing rules and the standard deviations are predicted. From the values of excess properties of the binary mixtures and its deviations indicate that a strong specific type of interaction is formed between the amino group (–NH2) of aniline and o-anisidine with hydroxyl group (–OH) of 2-alkoxyethanols. The strength of interaction is in the following order: aniline > o-anisidine in 2-alkoxyethanols (2-BE > 2-EE > 2-ME). Further the hydrogen bonding interaction of anilines with 2-alkoxyethanols is confirmed by FT-IR spectra.
    Journal of Molecular Liquids 10/2012; 174:34–41. DOI:10.1016/j.molliq.2012.07.025 · 2.08 Impact Factor
  • S.Kumar, P.Jeevanandham
    [Show abstract] [Hide abstract]
    ABSTRACT: Densities, viscosities and refractive indices have been measured for the binary mixtures of aromatic amines such as aniline and o-anisidine with 2-alkoxyethanols like 2-methoxyethanol, 2-ethoxyethanol and 2-butoxyethanol at 303.15 K. The excess properties are excess molar volume (VE), deviation of viscosity (ηE), deviation of refractive index (nDE), excess molar refraction (RmE) and excess Gibbs free energy (ΔG* E) for the six binary mixtures that were calculated and the values are fitted with Redlich–Kister polynomial equation. The measured refractive index values are analyzed by different theoretical mixing rules and the standard deviations are predicted. From the values of excess properties of the binary mixtures and its deviations indicate that a strong specific type of interaction is formed between the amino group (–NH2) of aniline and o-anisidine with hydroxyl group (–OH) of 2-alkoxyethanols. The strength of interaction is in the following order: aniline > o-anisidine in 2-alkoxyethanols (2-BE > 2-EE > 2-ME). Further the hydrogen bonding interaction of anilines with 2-alkoxyethanols is confirmed by FT-IR spectra.
    Journal of Molecular Liquids 07/2012; · 2.08 Impact Factor
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    ABSTRACT: Aloin (10-glucopyranosyl-1,8-dihydroxy-3-hydroxymethyl-9(10H)-anthracenone), a bioactive compound in Aloe vera, although known to have an anticancer effect, has not been used in current drug research. Optimization of the lead structure could enhance the utility of this compound. Hence, aloin was modified using natural amino acids to produce Schiff's base, a potential pharmacophore, and its corresponding aglycones. The synthetic derivatives exhibited significant enhancement in their efficacy toward antioxidant (DPPH radical scavenging) and cytotoxic activities than those of the parent compound, aloin showing promise for application in cancer treatment.
    Journal of Asian natural products research 05/2010; 12(5):360-70. DOI:10.1080/10286021003775327 · 0.97 Impact Factor
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    ABSTRACT: The dielectric relaxation and dipole moment of different concentration binary mixtures of Ethylene glycol, Propylene glycol and Butylene glycol with dilute solutions of 1,4-Dioxane at 33°C. The dielectric relaxation of binary mixtures of polar liquids in non polar solvents at microwave frequencies has been attempted such studies provide meaningful information regarding intermolecular and intramolecular association between the solutes and solvent molecules. The static dielectric constants (e 0) of glycols like ethylene glycol, propylene glycol and butylene glycol in dilute solutions of 1,4-Dioxane were determined at 303K. The measuring frequency of the dipole meter was 2MHz. X-band and J-band microwave benches operating at 9.52GHz and 7.72GHz were used for determination dielectric permittivity (e¢) and dielectric loss factor (e²). The values of molecular relaxation time (t 0) and dipole moment (m) for the different composition of binary mixtures are determined. The comparative values of relaxation time (t 0) of the two bands (X-Band) and (J-Band) for various binary mixture molecular conformation of these system.
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Publication Stats

8 Citations
8.56 Total Impact Points

Institutions

  • 2012
    • Annamalai University
      • Department of Physics
      Anamalainagar, Tamil Nādu, India
  • 2010
    • Asthagiri Herbal Research Foundation
      Chennai, Tamil Nadu, India