SINGLE-CRYSTAL ESR STUDY OF BIS(N-BENZYLPYRIDOXALDIMINATO) COPPER(II)

Single crystals of bis(N-benzylpyridoxaldiminato) Cu(II) were studied by ESR in three perpendicular planes at 300 K and 9.4 GHz. Only one exchange-narrowed line was observed for the two magnetically inequivalent copper ions in the monoclinic symmetry lattice with space group P2(1)/a and elementary cell parameters a = 9.561(9), b = 16.605(8), c = 17.561(2) Angstrom and beta = 104(1 degrees). Each ligand is bidentate via the phenolic oxygen and the imino nitrogen atoms, leading to tetrahedrally distorted square planar environment around the copper atom. The ESR linewidth remained Lorentzian for all orientations considered. The components of the g-tensor were found to be g(xx) = 2.043(4), g(yy) = 2.064(4), g(zz) = 2.259(4). The linewidth anisotropy was analyzed in terms of dipole-dipole interactions, magnetic inequivalence of molecules and hyperfine interactions.