EPR in the molecular magnet {Cu6[(MeSiO2)6]2}⋅6DMF

Resonance studies of single crystals of the molecular magnet {Cu6[(MeSiO2)6]2}⋅6DMF have been performed in a wide range of frequencies 18–142GHz and magnetic fields 0–7.5T at liquid-helium temperature. Two nonequivalent magnetic centers of copper nanoclusters with turn angle of the local axes (50±2)° have been found. The ground state of each magnetic center (magnetic molecules, containing a ring of six ferromagnetic interacting ions Cu2+ (S=1∕2)) can be represented as a system of energy levels with effective particle spin S=3 (g=2.28,2.28,2.083), split by an axial magnetic field DSz2 (D∕h=9.76GHz).