Study of Thermodynamic Parameters and Viscosity Behaviour of Substitutent Pyrazoles in 70% dioxane-water. Part-I

Abstract

Viscosity measurements have been made on system comprising 3-
(2" -hydroxy-3" -nitro-5" -chlorophenyl)-5-(2' -furyl) pyrazoline in 70%
dioxane-water mixture solvent at different temperatures. The data have
been used to calculate viscosity and thermodynamic parameters such
as ΔG*,  ΔH*, and  ΔS*. We have also studied the effect of solvent on
the viscosity at 30°C. It has been found that viscosity increases with
increase in the percentage of dioxane. Also viscosity increases due to
increase in concentration of ligand in 70% dioxane-water system. In
the present investigation we have calculated the value of   β-coefficient
and other thermodynamic parameters  ΔG*,  ΔH*, and  ΔS*  for the ligand
which shows that the process is spontaneous and irreversible.