| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 101 === Two rhenium(I) tricarbonyl complexes with 3-(2'-pyridyl)-1,2,4-triazole chelating ligand for anion sensing has been designed and synthesized. The identity and purity of these complexes have been characterized by NMR spectroscopy, mass spectrometry, and X-ray single-crystal diffraction. The complexes DL25-A and DL25-B are isomers to each other with the triazole ligand coordinating to Re(I) in different N-atoms. The anion sensing properties have been evaluated by UV-vis absorption, fluorescence, and 1H NMR titration experiments in acetonitrile. The absorption and fluorescence spectra for both complexes showed hypsochromic shifts upon addition of anions. The results of 1H NMR titration experiments have been confirmed that anion-receptor interaction is simple anion-induced deprotonation process.
In addition, the same product, DL-75, was obtained upon replacing the Br atom on the complex DL25-A and DL25-B with nicotinanilide, which was confirmed by the crystal structure analysis. A structural re-orientation upon formation of the solvato-intermediate has been proposed to rationalize the reaction mechanism.
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