Open AccessStudies on the effect of Dielectric constants of Aquo-DMF Solvent- System of the Solvolysis Products of Nicotinates
Author(s) -
RENU KUMARI,
Rajeeva Singh
Publication year - 2020
Publication title -
journal of ultra chemistry/journal of ultra chemistry
Language(s) - English
Resource type - Journals
eISSN - 2319-8036
pISSN - 0973-3450
DOI - 10.22147/juc/160504
Subject(s) - solvolysis , chemistry , formamide , solvent , enthalpy , entropy of activation , dielectric , thermodynamics , reaction rate constant , inorganic chemistry , organic chemistry , kinetics , hydrolysis , materials science , physics , quantum mechanics , optoelectronics
From the eenhancement observed in G* values with simultaneous decrease in the values of H and S* of the reaction, it is concluded that the organic co-solvent dimethyl formamide (DMF) acts as entropy controller and enthalpy stimulator solvent for alkali catalysed solvolysis of Methyl nicotinate. Form the evaluated values of water molecules associated with the activated complex of the reaction which are found to increase with increase in the temperature of the reaction, it is inferred that the bimolecular mechanistic path is changed to unimolecular in presence of the organic component (DMF) of the reaction media. The numerical value of Iso-Kinetic temperature of the reaction which comes to be nearly 287.5 (below 300) indicates that there is weak but considerable solvent-solute interaction in the aquo-DMF solvent system.