Ethoxylated eugenol as new solvent for silver alkene complex in GC. I. calculation of complex formation constant and thermodynamic quantities

ABSTRACT

Complex formation constants, K, were calculated for some alkenes from the retention data on ethoxylated eugenol [EE] stationary phase containing different concentrations of silver nitrate by GC. Thermodynamic quantities, i.e., differential molar free energy [delta Gs], enthalpy [delta Hs], entropy [delta Ss] and specific free energy of interaction [delta Gsp] were calculated. The relationships between the thermodynamic quantities and the corrected retention volumes were plotted and discussed. The obtained results reveal that, in EE solvent, the interaction between Ag + ions and alkene is stronger than Ag + ions and the corresponding alkane permitting the calculation of K values. The calculated values of thermodynamic quantities of interaction between alkenes and EE-AgNO 3 stationary phase are lower than the corresponding values on EE alone