EPR studies of Cu2+ in anhydrous sodium oxalate

Electron paramagnetic resonance spectra of Cu²⁺ doped in single crystal of anhydrous sodium oxalate grown by slow evaporation from saturated aqueous solutions have been investigated. EPR measurements gave the following values for the spin Hamiltonian parameters: g_xx = g_yy = 2.0741, g_zz = 2.3253, A_xx = A_yy = ?14.9G and A_zz = ?147.7 G. The principal axes of the hyperfine coupling and g tensors are spatially coincident. Using the optical absorption energy values given for a similar complex we have estimated the values of the bonding parameters and orbital-reduction factors for the system under investigation.