다중 피리딘 구조를 가지는 형광염료의 금속 이온 반응성에 대한 연구
Selective Metal Ion Sensing of Bipyridine-Bisterpyridine containing Fluorescent Dyes
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In this study, we synthesized a new fluorescent polypyridyl dye 2 containing a 2,2'-bipyridine in the center and two 2,2':6',2''-terpyridines at both ends. When exposed to various metal ions, the dye 2 showed selective fluorescence responses. In the presence of Cu2+ and Ni2+, it exhibited a highly effective fluorescence quenching, leading to large Ksv values of up to 105. In response to most other metal ions including Al3+, in contrast, its fluorescence changes little, showing a small Ksv value at 102. Meanwhile, the compound 2 revealed a differentiated fluorescence response to Zn2+, which is evidenced by a large red shift of > 100 nm. Such a red shift from the ion binding is attributed to the planarization of the bipyridyl unit extending the effective conjugation length in conjunction. A polypyridyl compound will find important usefulness in chemosensor application due to its selective binding to metal ions. Subsequent research concerned with modified derivatives is currently going on, as a way to provide high solubility even after metal-complexing.
Abstract
In this study, we synthesized a new fluorescent polypyridyl dye 2 containing a 2,2'-bipyridine in the center and two 2,2':6',2''-terpyridines at both ends. When exposed to various metal ions, the dye 2 showed selective fluorescence responses. In the presence of Cu2+ and Ni2+, it exhibited a highly effective fluorescence quenching, leading to large Ksv values of up to 105. In response to most other metal ions including Al3+, in contrast, its fluorescence changes little, showing a small Ksv value at 102. Meanwhile, the compound 2 revealed a differentiated fluorescence response to Zn2+, which is evidenced by a large red shift of > 100 nm. Such a red shift from the ion binding is attributed to the planarization of the bipyridyl unit extending the effective conjugation length in conjunction. A polypyridyl compound will find important usefulness in chemosensor application due to its selective binding to metal ions. Subsequent research concerned with modified derivatives is currently going on, as a way to provide high solubility even after metal-complexing.
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