J. J. Vora

Density and Comparative Refractive Index Study on Mixing Properties of Binary Liquid Mixtures of Eucalyptol with Hydrocarbons at 303.15, 308.15 and 313.15 K

Density and refractive index have been experimentally determined for binary liquid mixtures of eucalyptol with hydrocarbons (o-xylene,m-xylene and toluene) at 303.15 K, 308.15 K and 313.15 K. A comparative study of Lorentz-Lorenz (L-L), Weiner (W), Heller (H), Gladstone-Dale (G-D), Arago-Biot (A-B), Eykman (Eyk), Newton (Nw), Eyring-John (E-J) and Oster (Os) relations for determining the refractive index of a liquid has been carried out to test their validity for the three binaries over the entire mole fraction range of eucalyptol at 303.15 K, 308.15 K and 313.15 K. Comparison of various mixing rules has been expressed in terms of average deviation. From the experimentally measured values, refractive index deviations at different temperatures have been computed and fitted to the Redlich-Kister polynomial equation to derive the binary coefficients and standard deviations.

Kinetic Study of Application of ZnO as a Photocatalyst in Heterogeneous Medium

The photocatalytic degradation of 2,4-dinitrophenol over ZnO was carried out in the presence of light. Control experiments were carried out. The photocatalytic degradation of 2,4-dinitrophenol was observed spectro-photmerically. The various parameters like concentrations of substrate, pH, amounts and band gaps of semiconductor, impact of light intensity, sensitizers and radical quenchers affected the kinetics of the degradation process. A probable mechanism for this process has been proposed.

SYNTHESIS, CHARACTERIZATION AND BIOLOGICAL EVALUATION OF TRIAZOLE AND FUSED TRIAZOLE DERIVATIVES

ABSTRACT Triazole and fused heterocyclic triazole derivatives like Schiff bases, thiadiazoles, thiadiazepine, thiadiazine etc. were synthesized and characterized by IR, MS and 1 H NMR. The triazole derivatives were evaluated for their antibacterial activity against the gram-positive bacteria B. megaterium and S. aureus , the gram-negative bacteria E. aerogenes and P. Aeruginosa using DMSO as a solvent. INTRODUCTION Heterocycles are in the center of research due to their versatile application 1 . The triazole ring system is of particular interest especially within the realm of medicinal chemistry because of their versatile biological activity and clinical applications 2,3 . A number of triazole derivatives are associated with good biological as well as pharmacological activities like antibacterial 4 , anti-inflammatory 5 , antihypertensive 6 , antifungal 7 , anticancer 8 and antitumor 9 activity. Fused heterocyclic triazoles also possess important clinical applications

Application of Singh-Jha Equation in the Evaluation of b* Parameter of Laidler-Landskroener Equation in the Hydrolysis of Vinyl Acetate

Singh-Jha method is applied to calculate b* of Laidler-Landskroener equation, the distance of closed approach of solvent molecules to the activated complexes in alkaline hydrolysis of vinyl acetate. This method is applied to alkaline hydrolysis of vinyl acetate in water enriched ethanol between 30 °C and 35 °C. The rate of hydrolysis decreases with the increase of content of organic solvent at both temperatures. The size of transition state was found to be large as compared to the initial state. The b* was found to be 3.7693A which is in agreement with the values obtained earlier.

A Solution Study of Complex Formation of Some Diamines with Lanthanones

To study the metal ligand equilibrium in aqueous solution, the well known Irving-Rossotti titration method was used. The temperature selected is 30±0.10C at ionic strength 0.2 M (NaClO4) which was maintained constant through out the work. The binary metal complex (ML2) formation was studied. The metals selected are Sm3

Potentiometric Studies on the Protonation Constants and Protonation Energies of Some Diamines in Methanol + Water Mixtures

The protonation constants of diamines such as ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, o-phenylenediamine, m-phenylene-diamine, p-phenylenediamine were determined on the basis of Bjerrum and Calvin method in methanol-water mixtures. A pH metric method was used for calculation of protonation constants. The effects of solvents on protonation constant have been determined at ionic strength 0.2 M dm-3 (NaClO4) and temperature 30±0.1oC under nitrogen atmosphere. FORTRAN (IV) programs were used for calculation of protonation constants and distribution of species like H2L, HL, L in equilibrium state. The logarithm of the protonation constants decrease in aliphatic diamines and increase in aromatic diamines with increase in methanol content in mixed equilibria. The verification of constants are explained on the basis of solute-solvent interaction, solvation, proton transfer processes and dielectric constant of equilibria. Protonation energies have been calculated theoretically using computational methods and these protonation energies for aromatic diamines are higher than aliphatic diamines.

The Photoelectro Chemical Study of Picric Acid Using ZnO as ‘n’ Type Semiconductor

Photoelectro catalytic degradation of picric acid was experimentally investigated using a two electrode system. The decomposition of substrate was observed to be affected by photo-catalytic characteristics. Kinetics of reaction were found to be affected by parameters like concentration of substrate, pH, amount of semiconductor, light intensity, cell voltage, radical quencher and band gap, etc. Probable mechanism for the photoelectro catalytic degradation of picric acid is proposed.