PULSED ESR INVESTIGATIONS OF ANISOTROPIC INTERACTIONS IN M-AT-C-82 (M= SC, Y, LA)

We report on pulsed ESR investigations of the endohedral fullerenes Sc @C-82, Y@C-82, and La@C-82 in frozen solutions. We were able to determ ine the g tensors of these molecules by analysing magnetic field spect ra at X-band (9.5 GHz) and W-band (94 GHz) frequencies. Moreover, in Y @C-82 we have investigated the hyperfine interaction of the Y-89 nucle ar spin (I = 1/2) with the electron spin on the C-82 cage. The princip al values of the hyperfine tensor A and the relative orientation of g and A tensors were determined by applying three-and four-pulse electro n spin echo envelope modulation techniques (ESEEM).