Synthesis, Characterization, Photophysical Properties, and Small Molecule Sensing of Bis(salicyaldiminato)metal Copmlexes

• Main Authors: Jing-Chuan Su, 蘇靖釧
• Other Authors: Jing-Yun Wu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/45113338372726526560

碩士 === 國立暨南國際大學 === 應用化學系 === 103 === Four salen-type ligands, namely H2saldppy, H2saltBudppy, H2saltBuphpy, and H2saltBudmpy, and a series of bis(salicyaldiminato)metal complexes, M(saldppy) (M = Zn, Mg, Pd), M(saltBudppy) (M = Zn, Mg, Pd), Zn(saltBuphpy), and Zn(saltBudmpy), have been designed and synthesized. These compounds, especially Zn-complexes, have shown rich photophysical properties, making them being as candidates for small molecule sensing. In addition, by changing the functional group and diamine bridge of salen-type ligands would make impact influences on not only their fluorescent properties but also their sensing behaviors. Experimental results have shown that bis(salicyaldiminato)zinc complexes present the sensing ability towards nitro-compounds in the order of Zn(saltBudppy) > Zn(saldppy) > Zn(saltBuphpy) > Zn(saltBudmpy). This clear indicates that the functional group and diamine bridge of the salen-type ligand with strong electron-donating feature would increase the abilities of bis(salicyaldiminato)zinc complexes to sensing nitro-compounds. Further, bis(salicyaldiminato)zinc complexes Zn(saldppy), Zn(saltBudppy), and Zn(saltBuphpy) all exhibited significant fluorescence quenching upon the addition of silver salts, with exception of AgOAc in the case of Zn(saldppy) and Zn(saltBuphpy), which resulted fluorescent enhancement. Anion sensing examination showed that anion with strongly coordinating ability, such as OAc- and F- would cause fluorescence enhancement, while other anions cause no significant fluorescence quenching. As a result, fluorescence quenching observed in the silver salts can be reasonably attributed to the coordination of Ag-py. The change in, diamine bridge plays a role in influencing fluorescence of the Zn-complexes when recongnizing silver salts and/or anions.