ULTRASONIC AND VISCOMETRIC BEHAVIOR OF 5-(2- HYDROXYPHENYL)-3-(3-NITROPHENYL)-4-(2-FUROYL) PYRAZOL WITH DIOXANE-WATER AND ACETONE-WATER MIXTURE AT 303.15 K

ABSTRACT In view of importance of substituted pyrazoles in human life the densities, ultrasonic velocities and viscosities of 5-(2-hydroxyphenyl)-3-(3-nitrophenyl)-4-(2-furoyl) pyrazol have been measured in different concentrations (0.01 to 0.1 mol/dm 3 ) in 70% dioxane-water and 70% acetone-water mixtures at 303.15 K. The experimental data of sound velocities and densities of solutions in 70% dioxane-water have been used to calculate the various acoustical properties such as adiabatic compressibilities, apparent molal volumes, intermolecular free length, specific acoustic impedance, relative association etc. Also the effect of concentration of solute on viscosity has been studied in dioxane and acetone-water mixtures. From the viscosities and acoustical properties, the molecular interactions present in different solutions were studied. Appreciable molecular interactions have been observed between solute pyrazole and binary mixture of solvents, dioxane-water

Stability Constants of Some Biologically Important Pyrazoles and Their Ni2+ Complexes in Different Dielectric Constant of Medium

The proton-ligand stability constants of some biologically important new pyrazoles and formation constants of their complexes with Ni(II) were determined at 0.1 mol dm-3 ionic strength and at 303.15 K in different dielectric constant of dioxane-water mixture by potentiometric method. The Calvin-Bjerrum's pH-titration technique as used by Irving and Rossotti was used for determination of stability constants. The results enabled to study the electrostatic forces of attraction between metal ion and ligand with changes in dielectric constant of the medium

Stability Constants of Some Biologically Important Pyrazoles and Their Ni 2+ Complexes in Different Dielectric Constant of Medium

Abstract: The proton-ligand stability constants of some biologically important new pyrazoles and formation constants of their complexes with Ni(II) were determined at 0.1 mol dm -3 ionic strength and at 303.15 K in different dielectric constant of dioxane-water mixture by potentiometric method. The Calvin-Bjerrum's pH-titration technique as used by Irving and Rossotti was used for determination of stability constants. The results enabled to study the electrostatic forces of attraction between metal ion and ligand with changes in dielectric constant of the medium

Evaluation of Thermodynamic Parameters of 2, 4-Dichlorophenoxyacetic Acid (2, 4-D) Adsorption

Thermodynamic parameters of 2, 4-Dichlorophenoxyacetic acid (2, 4-D) adsorption were evaluated by studying the adsorption equilibrium and kinetics of 2, 4-D at different temperatures. Uptake capacity of activated carbon increases with temperature. Langmuir isotherm models were applied to experimental data of 2, 4-D adsorption. Equilibrium data fitted very well to the Langmuir equilibrium model. Adsorbent monolayer capacity , Langmuir constant and adsorption rate constant were evaluated at different temperatures for activated carbon adsorption. The activation energy of adsorption () was determined using the Arrhenius equation. Using the thermodynamic equilibrium coefficients obtained at different temperatures, the thermodynamic constants of adsorption (, , and ) were evaluated. The obtained values of thermodynamic parameters show that the adsorption of 2, 4-D is an endothermic process

Ion exchange properties of resins derived from phydroxybenzaldehyde, resorcinol and formaldehyde

Abstract: The terpolymeric resins were prepared by base catalyzed polycondensation of p-hydroxybenzaldehyde, resorcinol and formaldehyde. Resin obtained by molar monomer composition, p-hydroxybenzaldehyde: resorcinol: formaldehyde as 1:1:3 was abbreviated as PHBRF-I and that prepared by 1:2:4 composition was abbreviated as PHBRF-II. These resins were characterized by physicochemical methods such as elemental analysis, UV-Vis, IR and NMR

Synthesis, Chacterization, and Thermal Study of Terpolymeric Resin Derived from m-cresol, Hexamine and Formaldehyde

Terpolymeric resin was prepared from m-cresol (0.1M), hexamine (0.05M) and formaldehyde (0.2M) by acid catalyzed polycondensation method using 1M HCl in temperature range of 122-130°C.The resin was abbreviated as m-CHF-I. The molecular weight of terpolymer was determined by non-aqueous conductometric titration technique. The structure of resin was determined by its elemental analysis, UV-VIS, IR, and NMR data. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (410-485°C).The values of activation energies (Ea), entropy (∆S), and free energies (∆G) were in good agreement . The order of degradation reaction determined by FC method was confirmed by SW method