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The title Schiff base ligand, H2L, and its complex [CuL] have been prepared and characterized by elemental analysis and i.r. spectroscopy. The electrochemical properties of the single crystal [CuL]·0.5C2H4Cl2have been investigated by cyclic voltammetry (c.v.). Upon scanning at negative and positive potentials, two reduction and two oxidation waves were observed at E1/20= −0.47 and −0.77 V and E1/20= 1.10 and 1.39 V, respectively. Two Kcomvalues for the reduction and oxidation process are 1.2×105and 8.0×104, respectively, and indicate that the deprotonated ligand, L, has the ability to stabilize the mixed valent states of both CuIICuIand CuIICuIII. The crystal structure has been solved by X-ray diffraction, with a final R= 0.0653. Wound around a copper atom, the effectively tetradentate chain ligand, L, coordinates only viaits two imino and two phenolate groups at both ends of the chain. The geometry, D2dsymmetry, is best described as trans'N2O2' square-planar with slight tetrahedral distortion. The reason, why the mononuclear [CuL] unit can display two c.v. waves in each process, has been explained on the basis of configuration interchange between mono- and dinuclear units in c.v. electrolyte solution.

The authors report the first ion implanted planar optical waveguide in the nonlinear and multifunctional crystal NdxY1-xAl3(BO3)4 (NYAB). The refractive index profiles are characterised for both no and ne. The index changes show that a typical barrier waveguide is formed in the implanted NYAB crystal and comparisons of the refractive index profiles before and after annealing are given. The damage in the crystal surface that was caused by the implantation of MeV He ions was investigated by using an RBS/channelling technique and there was some decrease in the damage of the surface of the crystal after annealing. The loss of the waveguide was measured before and after annealing.