Abstract

Manoj R. Gaware

DOI : http://dx.doi.org/10.13005/ojc/360633

Viscometric studies for trinary mixture of6-(4-chlorophenyl)-1,2,3,4-tetrahydro-4-oxo-2-thioxopyrimidine-5-carbonitrilein 60% dimethyl sulphoxide was carried out at different temperatures ranging between 298 and 313 K over different concentration. From viscometric data ∆G, ∆S and ∆H were evaluated. The result shows that the magnitude of ∆G and ∆H are negative while ∆S is positive showing spontaneity of reaction according to thermodynamics pointing structure breaking takes place between solute and solvent. As ΔH is negative, and ΔS positive, the reaction will be spontaneous at low temperatures (decreasing the magnitude of the entropy term).The thermodynamic study reveals that as concentration increases spontaneity of reaction decreases.

Molecular Association; ∆G, ∆S, ∆H, Spontaneity; 6-(4-Chlorophenyl)-1,2,3,4-Tetrahydro-4-Oxo-2-Thioxopyrimidine-5- Carbonitrile; Viscosity

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