Electrical Conductance of Acetylcholine Halides and Perchlorate in Methanol at 25°

Chemistry Department, Faculty of Science, Alexandria University, Alexandria, A. R. E.

Manuscript received 6 April 1983, revised 20 December 1983, accepted 3 May 1984.

The conductance data of acetylcholine halides and perchlorate in methanol solution at 25^o are presented. The data were analyzed using the Fuoss-Onsager equation to obtain the characteristic parameters : the equivalent conductance at infinite dilution A_o , the closest distance of approach a^o , and the association constant K_A- Dependiog on the anion solvation, association was found to increase with increasing anionic radius. The trend of K_A is discussed in the light of the solvent separated ion-pair model. The electrostatic Stokes' radii R⁺ and R^- are calculated and their sum is compared with the value of a^o •