EPR Spectrum of Powder Sample Cu(bpy)(H 2 O) 2 SO 4

The spectrum of powder sample of metal-organic complex Cu(bpy)(H 2 O) 2 SO 4 has been investigated in the temperature range 2 - 30 K. It is established that the Kramers doublet |x 2 -y 2 〉 is the ground orbital state of ion Cu 2+ for this compound. Temperature dependences of effective g-factor components and resonance linewidth Δ H of individual powder particle are determined. The low-temperature broadening of the resonance line which is connected with short-range magnetic order was discovered. The estimation of the exchange interaction value in magnetic subsystem was made.