Kalyan Post Graduate College

Durg, India

Kalyan Post Graduate College

Durg, India
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Katre Y.,Kalyan Post Graduate College | Goyal N.,Kalyan Post Graduate College | Singh A.K.,Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College
Journal of Dispersion Science and Technology | Year: 2013

The effect of cationic surfactant cetyltrimethylammonium bromide (CTAB) on the oxidation of L-lysine by N-bromophthalimide (NBP) has been studied at 308 K. The reaction exhibits first order dependence on NBP and L-lysine and negative and fractional order dependence on HClO4. The effects of KCl, KBr, phthalimide, mercuric acetate, and dielectric constant of the medium have also been studied and summarized. CTAB strongly catalyzes the reaction and typical k obs and CTAB profile was observed, that is, with a progressive increase in CTAB, the reaction rate increased and after achieving a peak k obs decreased at higher concentrations of CTAB. The results are treated quantitatively in terms of 'Menger-Portnoy' and 'Piszkiewicz' models. The various activation parameters in presence and absence of CTAB have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The rate constant in micellar phase k M, cooperativity index (n) and binding constant have been computed. © 2013 Copyright Taylor and Francis Group, LLC.


Katre Y.,Kalyan Post Graduate College | Goyal N.,Kalyan Post Graduate College | Kumar Singh A.,Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College
Zeitschrift fur Physikalische Chemie | Year: 2011

The effect of cationic surfactant cetyltrimethylammonium bromide (CTAB) on the oxidation of L-leucine by N-bromophthalimide (NBP) has been studied at 308 K. The reaction exhibits first order dependence on NBP and L-leucine and negative and fractional order dependence on HClO4. The effects of KCl, KBr, phthalimide and mercuric acetate have also been studied and summarized. The rate of reaction increased with an increase in dielectric constant of the medium. CTAB strongly catalyzes the reaction and typical k obs and CTAB profile was observed, i.e., with a progressive increase in CTAB, the reaction rate increased and after achieving a peak kobs decreased at higher concentrations of CTAB. The results are treated quantitatively in terms of "Piszkiewicz" and "Raghvan and Srinivasan's" models. The various activation parameters in presence and absence of CTAB have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The rate constant in micellar phase kM, cooperativity index (n), binding constant (K1 and K2) have been computed. © by Oldenbourg Wissenschaftsverlag, München.


Katre Y.,Kalyan Post Graduate College | Goyal N.,Kalyan Post Graduate College | Sharma R.,Kalyan Post Graduate College | Singh A.K.,Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College
Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry | Year: 2013

The kinetics of oxidation of L-arginine by N-bromophthalimide in the presence of HClO4 has been investigated in different media, viz., aqueous and micellar media of cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS). The reaction is found to be dependent on substrate, [H+], CH3COOH and surfactant. The order of oxidation is found to be positive fractional order with respect to L-arginine and negative fractional order with respect to [H+]. Polarity of the medium also has an effect on the rate of reaction. Based on experimental findings, a mechanism has been proposed and discussed for the oxidation reaction. The micelles influence the rate of reaction significantly. Rate enhancement is observed in the presence of CTAB while an inhibiting effect is observed in the presence of SDS. These effects have been further analysed by means of the pseudo-phase models based on which the rate constant and binding constants have been evaluated.


Katre Y.,Kalyan Post Graduate College | Nayak S.,Kalyan Post Graduate College | Sharma D.N.,Kalyan Post Graduate College | Singh A.K.,Vishwanath Yadav Tamaskar Post Graduate Autonomous College
Research on Chemical Intermediates | Year: 2012

The kinetics of micellar catalyzed oxidation of galactose by N-bromophthalimide was studied in the presence of acidic medium at 308 K. The oxidation reaction exhibits first-order kinetics with respect to oxidant (N-bromophthalimide), fractional order with respect to substrate (galactose) and positive fractional order with respect to HClO 4 on the rate of reaction. The rate of the reaction increased with decreasing the dielectric constant of the medium. With a progressive increase in the concentration of CTAB, the rate of reaction increased and after reaching peak kobs, decreased at higher concentrations of CTAB. There catalytic roles are best explained by Berezin's model. The influence of salts on the reaction rate was also studied. The various activation parameters have been calculated. The rate constant and binding constant with the surfactant have also been evaluated. A suitable mechanism consistent with the experimental findings has been proposed. © Springer Science+Business Media B.V. 2011.


Katre Y.,Kalyan Post Graduate College | Singh M.,Kalyan Post Graduate College | Singh A.K.,Vishwanath Yadav Tamaskar Post Graduate Autonomous College
Journal of Dispersion Science and Technology | Year: 2011

The kinetics and mechanism of N-bromosuccinimide (NBS) oxidation of D-mannose in the absence and presence of cetyltrimethy lammonium bromide (CTAB) in acidic media have been studied under the condition [D-mannose]T >> [NBS]T at 40°C. Under the kinetic conditions, both the slower uncatalyzed and faster catalyzed paths go on. Both the paths show the fractional and first order dependence on [D-mannose] and [NBS]T, respectively. The rate decreased with increase in acidity. Neither succinimide (NHS) nor Hg(II) influenced the reaction rate. Activation parameters of the reactions were determined by studying the reaction at different temperatures (30-50°C). The influence of salts on the reaction rate was also studied. CTAB accelerates the reactions and the observed effects have been explained by considering the hydrophobic and electrostatic interaction between the surfactants and reactants. In the reaction, approximately 1 mole of NBS oxidized one mole of D-mannose. A reaction scheme of the oxidation of D-mannose by NBS was found to be in consistent with the rate law and the reaction stoichiometry. © Taylor & Francis Group, LLC.


Katre Y.,Kalyan Post Graduate College | Singh M.,Kalyan Post Graduate College | Singh A.K.,Vishwanath Yadav Tamaskar Post Graduate College
Tenside, Surfactants, Detergents | Year: 2011

The oxidation reactions of D-sucrose have been carried out with N-bromophthalimide in the presence of micellar aggregates at 45°C. The kinetics revealed first order dependence on N-bromophthalimide (NBP) and fractional order dependence on Dsucrose. Variation of mercuric acetate concentration has an insignificant effect on reaction rate. The stoichiometric ratio of NBP: D-sucrose was 1:2 and the oxidation product was aldonic acid confirmed by FeCl3-HCl test. The influence of salts on the reaction rate has also been studied. Phthalimide (NHP) and sulfuric acid (H 2SO4) inhibit the rate. Thermodynamic and activation parameters have been evaluated and a mechanism consistent with the kinetic data has been proposed. Cetyltrimethylammonium bromide (CTAB) and TritonX-100 (TX-100) catalyze the reaction, while sodium dodecyl sulfate (SDS) inhibits the rate of reaction. The applicability of Berezin's model was tested to explain the observed micellar effects. The rate constants (kM) and binding constants (Ks + Ko) have been evaluated. © Carl Hanser Publisher, Munich.


Katre Y.,Kalyan Post Graduate College | Singh M.,Kalyan Post Graduate College | Singh A.K.,Vishwanath Yadav Tamaskar Post Graduate College
Oxidation Communications | Year: 2011

The kinetics and mechanism of the micellar-catalysed oxidation of D-fructose by N-bromophthalimide (NBP) in sulphuric acid (H2SO 4) media has been investigated at 40°C. The reaction exhibits fractional order, first order and negative fractional order kinetics with respect to [fructose], [NBP] and [H2SO4], respectively. In the presence of additives, the critical micellar concentration (CMC) values of surfactants are lower than those given in literature. Cationic micelle of cetyltrimethylammonium bromide (CTAB) catalyses the reaction, i.e. with a progressive increase in [CTAB], the reaction rate increased and at higher concentration reaction rate decreased. The observed micellar effects are explained by the applicability of the Berezin model considering a distribution pattern of the reactants between the micellar and aqueous phases. Anionic micelles of sodium dodecylsulphate (SDS) slightly inhibit the reaction. Variation of [phthalimide] showed that the rate of reaction decreased with increasing [phthalimide]. It was observed that on increasing [mercuric acetate] there was no change in reaction velocity. The effects of various inorganic salts were also studied in micellar media. The effect of [surfactants] on the activation parameters was explored to rationalise the micellar effect. A detailed mechanism with the associated reaction kinetics is presented and discussed.


Singh M.,Kalyan Post Graduate College
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2012

The oxidation of D-sucrose by N-bromosuccinimide and surfactants as a catalyst in the presence of acidic medium was studied at 45°C (± 0.1°C). The rate studies were made under pseudo-first-order conditions with an excess of sugar over the oxidant. In this aim was followed a mechanistic and structural investigation based on a micellar kinetic study. The kinetics revealed first-order dependence on N-bromosuccinimide and fractional-order dependence on D-sucrose. Variations of mercuric acetate had an insignificant effect on reaction rate. The solvent effect revealed that negative dielectric effect. The influence of salts on the reaction rate was also studied. Succinimide and sulfuric acid inhibit the rate. The rate constant (k W), binding constants (K S+K O), and corresponding activation parameters (E a, ΔH #, ΔS #, and ΔG #) were determined. A detailed mechanism with associated reaction kinetics is presented and discussed. Differences among the oxidation rates of the D-sucrose in the presence of various surfactants discussed qualitatively in terms of Berezin's model, nature of surfactants, and charge of surfactants. © 2012 Copyright Taylor and Francis Group, LLC.


Goswami G.K.,Kalyan Post Graduate College | Yadav A.K.,Galgotias University | Mishra M.,Shri Shankaracharya Engineering College
International Journal of Theoretical Physics | Year: 2014

In the present work, we have searched the existence of ΛCDM-type cosmological model in anisotropic Heckmann-Schucking space-time. The matter source that is responsible for the present acceleration of the universe consist of cosmic fluid with p = ωiρ, where ωi is the equation of state parameter for different cosmic fluids. The Einstein’s field equations have been solved explicitly under some specific choice of parameters that isotropizes the model under consideration. It has been found that the derived model is in good agreement with recent SN Ia observations. Some physical aspects of the model has been discussed in detail. © 2014, Springer Science+Business Media New York.


Singh M.,Kalyan Post Graduate College
Research on Chemical Intermediates | Year: 2013

Kinetic investigations of oxidation of dextrose by N-bromophthalimide (NBP) in acidic medium in the presence of mercuric(II) acetate as a scavenger have been studied. In both the absence and presence of surfactants, the oxidation kinetics of dextrose by NBP shows a first-order dependence on NBP, fractional order on dextrose, and negative fractional order dependence on sulfuric acid. The determined stoichiometric ratio was 1:1 (dextrose:NBP). The variation of Hg(OAC)2 and phthalimide (reaction product) have an insignificant effect on reaction rate. Effects of surfactants, added acrylonitrile, added salts, and solvent composition variation have been studied. Activation parameters for the reaction have been evaluated from Arrhenius plot by studying the reaction at different temperature. The rate law has been derived on the basis of obtained data. A plausible mechanism has been proposed from the results of kinetic studies, reaction stoichiometry and product analysis. The role of anionic and non-ionic micelle was best explained by the Berezin's model. © 2012 Springer Science+Business Media B.V.

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