EPR study of Cu2+ ion doped orotato(nicotinamid)cobalt(II) single crystal

• The magnetic properties of the [Co(HOr)(na)(H2O)3]·CH3OH·H2O single crystals is characterized by EPR technique.
• The Cu2+ ions enter the host lattice in substitutional position.
• The site symmetry is slightly tetragonally distorted.

We have studied the Cu2+ ion doped orotato(nicotinamid)cobalt(II) complex by using EPR spectroscopy and X-ray diffraction. The single crystal is triclinic with the space group P1‾. The unit cell dimensions of the crystal are a = 7.2785(4) Å, b = 10.2349(5) Å, c = 12.7372(6) Å, α = 69.297(4)°, β = 74.791(4)° and γ = 76.995(4)°, with Z = 2. We analyzed the EPR spectra of both single crystal and powder of the complex at room temperature. EPR analysis indicates the presence of only one Cu2+ site. We obtained the spin Hamiltonian parameters from the single crystal data for the complex. The spin Hamiltonian parameters are gx = 2.032, gy = 2.116, gz = 2.319, Ax = 28 G, Ay = 66 G, Az = 126 G. These data indicate that the symmetry of paramagnetic center is rhombic. We constructed the ground state wave function of the Cu2+ ion.

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