Jayesh Ramani

New Ternary Transition Metal Complexes of 2-{[(2-aminophenyl)imino] methyl}Phenol and Metformin: Synthesis, Characterization and Antimicrobial Activity

Complexes of Co(II), Ni(II) and Cu(II) were synthesized from Schiff base 2-{[(2-aminophenyl)imino]methyl}phenol and metformin. The authenticity of the transition metal complexes were characterized by elemental analyses, conductance and magnetic susceptibility measurements, as well as spectroscopic (IR, electronic) and thermal studies. IR spectral studies revealed the existence of the ligands in the amine form in the solid state. The magnetic and electronic spectral studies suggest an octahedral geometry for all the complexes. The metformin acts as a bidentate ligand and Schiff base of o-phynelendiamine and salicylaldehyde acts as a tridentate ligand. Antimicrobial screening of the Schiff base, metformin and transition metal complexes were determined against the bacteria Escherichia coli and Bacillus megaterium.

Volumetric, viscometric and ultrasonic studies on binary mixtures of oleic acid with alkyl esters at 303.15, 308.15 and 313.15 K

Density (), viscosity (η) and speed of sound (u) for binary mixtures of oleic acid with methyl acetate, ethyl acetate, n-propyl acetate and n-butyl acetate were measured at 303.15, 308.15 and 313.15 K over the whole composition range at atmospheric pressure. These results were used to calculate excess molar volumes (V E ), deviations in viscosity (Δη), deviations in speed of sound (Δu), the excess Gibbs free energies of activation of viscous flow (G* E ), deviation in adiabatic compressibility (ΔkS), acoustic impedance (Z) and deviation in acoustic impedance(ΔZ). These results were fitted to Redlich-Kister type polynomial equation of the third degree to derive the binary coefficients. The standard error values were estimated between the calculated and experimental data.

Density, excess molar volumes and refractive indices of β-pinene with o, m, p-xylene and toluene at 303.15, 308.15 and 313.15 K

Densities (ρ), excess molar volumes (VE ), refractive indices (nD ) and deviation in refractive (ΔnD ) indices on mixing for β-pinene with o-xylene, m-xylene, p-xylene and toluene have been determined at T = 303.15, 308.15 and 313.15 K. The excess molar volume and deviation in refractive index have been fitted to Redlich–Kister polynomials. In addition, deviations in refractive indices were compared with the predictions of several mixing rules. Results obtained have been discussed in terms of intermolecular interactions.

Kinetic study of specific base catalyzed hydrolysis of ethyl acrylate in water-ethanol binary system

Kinetic study of hydroxide anion catalyzed hydrolysis of ethyl acrylate has been carried in ethanol-water (10–50% v/v) binary systems at the temperature range 30 ± 0.1, 35 ± 0.1, 40 ± 0.1, and 45 ± 0.1°C. Calculated specific rate constant values decreases with increasing proportion of ethanol at all temperatures. The observed retardation of a base catalyzed hydrolysis reaction is explained on the basis of fact that the formation of polarized transition state is disfavored with increase in % of ethanol. The relation between the change in dielectric constant due to variation in binary mixtures and change in specific rate constant are explained on the basis of electrostatic and non electrostatic contributions of solvent mixtures. The variation of ΔG*, ΔH*, ΔS* with solvent composition and the specific effect of water on the reaction rate kinetics are also discussed.

A STUDY OF THERMODYNAMIC AND INTERACTION PARAMETERS OF OLEIC ACID WITH SOME APROTIC SOLVENTS AT TEMPERATURES OF 303.15, 308.15, AND 313.15 K

Density (ρ) and viscosity (η) of binary mixtures of oleic acid with 1,4-dioxane, N,N-dimethylformamide (N,N-DMF) and dimethylsulfoxide (DMSO) were measured over the entire composition range at 303.15, 308.15, and 313.15 K. The excess molar volume (VE), deviation in viscosity (Δη), and excess free energy of activation of viscous flow (G*E) were calculated using corresponding experimental data as a function of composition. Interaction parameters d12, H12, T12, and Wvis/RT were determined from experimental data of viscosity using the well-known two-body models of Dolezalek-Schulze, Grunberg-Nissan, Tamura-Kurata, and Katti-Chaudhari respectively. The parameters M12 and M21 were calculated using the three-body McAllister relation, and it was found that correlating ability significantly improves for these nonideal systems as adjustable parameters increase. The excess and deviation functions VE, Δη, and G*E were found to have positive values, and these values indicate the presence of dispersion forces as forces of molecular interactions in these binary mixtures. The computed results were fitted to the Redlich-Kister polynomial equation. The main thrust of this study is to correlate the excess properties and interaction parameters with the nature of molecular interactions between the mixing components.

Evaluation of Stability of Complexes of Inner Transition Metal Ions with 2-Oxo-1-pyrrolidine Acetamide and Role of Systematic Errors

BEST FIT models were used to study the complexation of inner transition metal ions like Y(III), La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Dy(III) and Th(IV) with 2-oxo-1-pyrrolidine acetamide at 30 0 C in 10%, 20, 30, 40, 50% and 60% v/v dioxane-water mixture at 0.2 M ionic strength. Irving Rossotti titration method was used to get titration data. Calculations were carried out with PKAS and BEST Fortran IV computer programs. The expected species like L, LH+, ML, ML 2 and ML(OH) 3, were obtained with SPEPLOT. Stability of complexes has increased with increasing the dioxane content. The observed change in stability can be explained on the basis of electrostatic effects, non electrostatic effects, solvating power of solvent mixture, interaction between ions and interaction of ions with solvents. Effect of systematic errors like effect of dissolved carbon dioxide, concentration of alkali, concentration of acid, concentration of ligand and concentration of metal have also been explained here.