The facilitated transfer of the Nat cation through the water (w)/nitrobenzene (nb) interface affected by dibenzo-1%crown-6 dissolved in the organic phase was studied by the cyclic voltammetry in the temperature range of 545°C. The transfer was found to be a very fast process at each studied temperature (5,20, 35,50, and 65°C); the process is controlled by diffusion of the elcctroneutral crown ionoghore from the volume of the nitrobenzene phase to the interface. Changes of thermodynamic functions characterising the studied equilibrium reaction Na * (nb) + L(nb) +NaL + (nb), where L = dibenzo-18-crown-6, were determined for a temperature of 25°C: AG = -36.0 kJmo1 I, AH = -38.9 kJmol_', and AS = ~ 9.7 J mol-' K-l. Further, the change of the standard Gibbs energy of the transfer of the NaL+ complex from the aqueous phase into the nitrobenzene one, AGF;,\zL?b = -20.1 kJ mol-*, was calculated together with the value of the standard Galvani poten:ial difference of the NaL' cation between the nztrobenzene and the aqueous phases Atbq&,,+ = 0 208 V, and the value of Brig@' logarithm of inditidual extraction constant, log K' NaLn = 3.5 (L = dibenzo-IS-crown-Q for the two-phase water-nitrobcnzene system.