| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 99 === This thesis encompasses the synthesis of trinuclear complexes of nickel(II) and zinc(II) that bear N6O2 octdentate ligands. As shown in Fig 1, two aminopyridines link to piperazine or diazepane dialkoxide to constitute an octdentate N6O2 chelation (1a) and (1b), respectively.
As the reactions were carried out with the metal salt to ligand in a 3:1 ratio, trinuclear complexes were resulted as the major products evidenced by ESI-MS. The structures of these complexes have been further characterized by UV-VIS, IR spectroscopies and conductivity measurement. The structure of [(ZnII)3(L-6-PyMe)]OAc shows that four zinc ions were found to be bound to one ligand plus with two bridging acetates that connect with the two neighbor zinc. Based on the result of metal exchange experiment, it could be indicated that the octadentate ligand showed better selectivity towared copper(II) ion than other metal ions. The reactions of 3,5-di-tert-butylcatechol with such complex in methanol and acetonitrile in the aerobic conditions have been investigated. Formation of 3,5-DTBQ was evidenced by the UV-VIS absorption at 403 nm. The mechanism of such a reaction is approached.
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