Second order optical nonlinearities of copper(II) and palladium(II) complexes with N-salicylidene-N'-aroylhydrazine tridentate ligands.

Three new N-salicylidene-N'-aroylhydrazines tridentate ligands were prepd.: N-4-diethylaminosalicylidene-N'-(4-nitrocinnamoylhydrazine) (L1), N-4-diethylaminosalicylidene-N'-4-(2,4-dinitrophenylethylidene) benzoylhydrazine (L2), N-4-diethylaminosalicylidene-N'-4-(6-nitro-2-benzoxazolyl)benzoylhydrazine (L3). From these ligands, mononuclear acentric complexes of Cu(II) and Pd(II), with pyridine as further ligand, were prepd. and characterized, also by single-crystal x-ray anal. These complexes show high 2nd order nonlinear optical activity (EFISH, |μβ| up to 3000 × 10-48 esu, incident wavelength 1.907 μm). The properties of metalorg. polymers obtained by grafting com. poly(4-vinylpyridine) with ML1 fragment (M = CuII or PdII) are also reported