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Different Quenching Effect of Intramolecular Rotation on the Singlet and Triplet Excited States of Bodipy

Lou, Zhangrong ; Hou, Yuqi ; Chen, Kepeng ; Zhao, Jianzhang ; Ji, Shaomin ; Zhong, Fangfang ; Dede, Yavuz ; Dick, Bernhard


It is well-known that the fluorescence of a chromophore can be efficiently quenched by the free rotor effect, sometimes called intramolecillar rotation (IMR), i.e. by a large-amplitude torsional motion. Using this effect, aggregation induced enhanced emission (AIE) and fluorescent molecular probes for viscosity measurements have been devised. However, the rotor effect on triplet excited states ...


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