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Issue 21, 2017
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Flapping viscosity probe that shows polarity-independent ratiometric fluorescence

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Abstract

A variety of fluorescent molecular viscosity probes have been widely used for mapping the local viscosity in cells and for monitoring the microenvironments in materials. However, their viscosity-sensing structural design still relies strongly on molecular rotors featuring intramolecular rotational dynamics. Here we report flapping molecules (FLAP) as a ratiometric viscosity-sensing fluorophore that shows polarity-independent dual fluorescence. Viscosity-sensing mechanism is based on a unique V-shaped-to-planar conformational change in the singlet excited state (S1), in which the flexible motion of an eight-membered ring plays an important role. Fast conformational dynamics have been studied by time-resolved spectroscopies, and the viscochromic properties have been quantitatively analyzed. Application of FLAP to monitoring the curing process of epoxy resins has also been demonstrated, in which other typical environment-sensitive dyes did not work as a local viscosity probe.

Graphical abstract: Flapping viscosity probe that shows polarity-independent ratiometric fluorescence

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Publication details

The article was received on 10 Apr 2017, accepted on 10 May 2017 and first published on 23 May 2017


Article type: Paper
DOI: 10.1039/C7TC01533J
Citation: J. Mater. Chem. C, 2017,5, 5248-5256
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    Flapping viscosity probe that shows polarity-independent ratiometric fluorescence

    R. Kotani, H. Sotome, H. Okajima, S. Yokoyama, Y. Nakaike, A. Kashiwagi, C. Mori, Y. Nakada, S. Yamaguchi, A. Osuka, A. Sakamoto, H. Miyasaka and S. Saito, J. Mater. Chem. C, 2017, 5, 5248
    DOI: 10.1039/C7TC01533J

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