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Schiff base ligands HL 1 -HL 6 have been prepared from the reaction of 2,6-diformyl-4-t-butylphenol and 2,6-diformyl-4-methylphenol with various aromatic amines in ethanolic solution. The Schiff base ligands 2,2¢-dipyridine (dp) mixed-ligand Cu II complexes have been obtained. Mixed-ligand Cu II complexes containing the dp ligand have ionic nature and they conduct the electricity in solution media. The complexes have been obtained in two different forms: one of them is [Cu 2 (L n )Cl 3 ] (n: 1, 2, 3, 4, 5 and 6) and other complexes have the general formula [Cu 2 (L n )(dp) 2 ]3Cl. Ligands and their complexes have been characterized by elemental analyses, FT-IR, electronic spectra, molar conductance, 1 H( 13 C)-n.m.r. and mass spectral data. Their stoichiometric protonation constants have been determined potentiometrically in dioxan using a combined pH electrode at 25°C, under a nitrogen atmosphere. For the calculation of the protonation constants, PKAS computer programme has been used. The effects of the substituents on the protonation constants and the additivities of these effects are discussed. The antimicrobial activity studies of the ligands and their complexes have been studied against the Bacillus megaterium, Micrococcus luteus, Corynebavterium xenosis, Enterococcuc faecalis, bacteria and Saccoramyces cerevisia, yeast. The catalytic properties of the complexes have been studied on the ascorbic acid, catechol and 2,6-di-t-butylphenol substrates. Thermal behaviour of the complexes has been studied by thermal techniques.

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Propranolol dithiocarbamate (PDTC) and its complexes with Cu(II), Co(II), Ni(II), Zn(II) and Cd(II) have been synthesized and characterized by elemental analyses, FT-IR, electronic spectra, atomic absorption spectra, molar conductance, mass and 1 H-n.m.r. spectral data. Information on the stoichiometry of the complexes was obtained from the continuous variation method (Job's method). The thermal decomposition behaviour of PDTC metal complexes was investigated in a nitrogen atmosphere using TG and DTA techniques. The antimicrobial activity studies of the metal complexes have been recorded against the Bacillus megaterium, Bacillus brevis, Yersinia enterocolitica, Micrococcus luteus, Pseudomonas aeruginosa, Enterococcus faecalis, Kluyveromyces marxianus, Candida tropicalis, Candida albicans and Kluvyeromyces fragilis.