Reactivity of metal chelates of sulphur containing ligands towards Lewis bases. Part III. Reaction of bis(1,2-dimethyl-and 1-phenyl-1,2-ethanediylidene)bis(S-methylhydrazinecarbodithioate)NN′SS′(−2)dizinc(II) with pyridines |
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| Authors: | M.F. Iskander L. El-Sayed M. Tawfik M. Arafa |
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| Affiliation: | University of Alexandria Research Center, UNARC, and Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt |
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| Abstract: | The reaction of the dimeric zinc(II) chelates of the type I (R1 = R2 = CH3, R1 = H, R2 = Ph) with pyridine, 2-methylpyridine, 3-methylpyridine and 4-methylpyridine afforded the monomeric monobase adducts. The isolated adducts were characterized by their electronic and 1H NMR spectra, and a five coordinate square pyramidal structure was tentatively assigned for these adducts.The adduct formation reaction was followed spectrophotometrically and the reaction kinetics were studied using a stopped flow technique. From the available kinetic data, as well as the measured activated parameters (ΔH#, ΔS#), a mechanism for the adduct formation reaction is proposed. |
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| Keywords: | Author to whom correspondence should be addressed. |
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