ESR study of Cu2+ doped sodium ammonium sulphate dihydrate

The ESR study of Cu2+ doped sodium ammonium sulphate dihydrate has been done at room temperature. Two magnetically inequivalent sites for Cu2+ have been observed. The spin-Hamiltonian parameters have been determined with the fitting of spectra to rhombic symmetry crystalline field. The parameters are Cu2+ (I): gx=2.121, gy=2.138, gz=2.425, Ax=23×10−4 cm−1, Ay=54×10−4 cm−1, Az=92×10−4 cm−1; Cu2+ (II): gx=2.038, gy=2.061, gz=2.337, Ax=35×10−4 cm−1, Ay=57×10−4 cm−1, Az=100×10−4 cm−1. The ground state wavefunction has also been determined. The g-anisotropy has been evaluated and compared with the experimental value. With the help of optical study, the nature of bonding in the complex has also been discussed.