Interactions Study of Co-enzyme-Q0 with Aniline and Pyrrole Using Square Wave Voltammetric Technique

The interactions of Co-enzyme Q0 with Aniline and Pyrrole were studied in aqueous phosphate buffer solution at (pH=7.0) as supporting electrolyte using square wave voltammetry, Co-enzyme Q0 gives a well-defined square wave voltammetric peak at (-0.0415) volt against the reference electrode (Ag/AgCl/3M KCl). The binding constants (K) were calculated at different temperatures. Vant's hoff equation is applied to calculate the thermodynamic parametrs (H enthalpy changes, S entropy changes and G free energy changes), and then the type of interaction was estimated. The results indicated that the interaction between Co-enzyme Q0 and Aniline (H and S negative values) was probably due to Vander Waals forces or hydrogen bonding interaction, and the second interaction between Co-enzyme-Q0 with Pyrrole (H and S positive values) might be due to the hydrophobic interaction .