EPR studies of Cu2+ ions in disodium maleate monohydrate [C4H2O4Na2 · H2O] single crystal

Single crystals of transition metal ions Cu2+ doped disodium maleate monohydrate, [C4H2O4Na2 · H2O], have been grown by solvent evaporation of the saturated aqueous solution at room temperature and investigated by single crystal EPR spectral studies. Angular variation of copper hyperfine lines in the three orthogonal planes shows the presence of two magnetically inequivalent substitutional Cu2+ sites in the lattice. The principal values of the g- and A-tensors indicate nearly axial symmetry around the Cu2+ ion. Direction cosines of the principal values of the g- and A-tensors have been determined. Bonding parameters were evaluated and the ground state wave function of the Cu2+ ion was constructed.