Metal-induced dynamic conformational and fluorescence switch of quinone-appended Zn-porphyrin
Abstract
In this report, we have designed and synthesized a novel switching molecule whose fluorescence can be switched via dynamic conformational change between expanded and shrunk states induced by metal complexation and decomplexation. The switching molecule is composed of three kinds of components, namely, a Zn2+-porphyrin fluorophore, two quinone quenchers, and their linkers containing a 4,4′-bipyridine moiety. UV-vis and fluorescence titration studies revealed that metal complexation of the bipyridine units with Zn2+ ions induced the dynamic structural change of the molecular shape and simultaneous enhancement of fluorescence of the Zn2+-porphyrin fluorophore.
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Dedicated to Professor Shunichi Fukuzumi on the occasion of his retirement
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