potential ( ox E 1 ) of 1-9, as well as the first and second free energies of electron transfer ( G et(n) , for n = 1, 2, which is given by the Rehm-Weller equation) between 1-9 and the nitride Gadolinium cluster Gd 3 N@C 80 (n = 80, 82, 84, 86 and 88) 10-14 derivatives as [X-UT-Y][Gd 3 N@C n ](n = 80, 82, 84, 86 and 88) 15a-i -19a-i supramolecular complexes are presented and investigated. The first and second free energies of electron transfer and kinetic rate constants of the electron transfers, G # et(n) and k et (n = 1,2), respectively, were also calculated in this study for [X-UT-Y][M 3 N@C 80 -R] and in accordance with the Marcus theory.