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The complex formation of amantadine hydrochloride with 18-crown-6 was studied in methanol solution by surface tension, conductivity and IR study. The limiting apparent molar volume data have been used to characterize the interaction between drug molecule (amantadine hydrochloride) and 18-crown-6 in the experimental ternary solution systems. A conductance study concerning the interaction between cationic organic ammonium ions amantadine with 18-crown-6 in methanol solution has been carried out at different temperatures. The formation constant (log K   f  ) of the resulting 1:1 complex at various temperatures was determined from the conductivity study. The enthalpy (Δ H  0 ) entropy (Δ S  0 ) and free energy change (Δ G  0 ) of the complexation reaction was determined from the temperature dependence of the formation constant.

Probing Inclusion Complex Formation of Amantadine Hydrochloride with 18-Crown-6 in Methanol by Physicochemical Approach