The development of a new methodology for visualizing and detecting gases is imperative for various applications. Here, we report a novel strategy in which gas molecules are detected by signals from a reporter guest that can read out a host structural transformation. A composite between a flexible porous coordination polymer and fluorescent reporter distyrylbenzene (DSB) selectively adsorbed CO2 over other atmospheric gases. This adsorption induced a host transformation, which was accompanied by conformational variations of the included DSB. This read-out process resulted in a critical change in DSB fluorescence at a specific threshold pressure. The composite shows different fluorescence responses to CO2 and acetylene, compounds that have similar physicochemical properties. Our system showed, for the first time, that fluorescent molecules can detect gases without any chemical interaction or energy transfer. The host–guest coupled transformations play a pivotal role in converting the gas adsorption events into detectable output signals.
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This work was supported by the Murata Science Foundation, ERATO-JST, a Grant-in-Aid for Young Scientists (A), and a Grant-in-Aid for Scientific Research on Innovative Area ‘Emergence in Chemistry’ from MEXT. The synchrotron radiation experiments were carried out at BL02B2 in SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal no. 2009B1320).
The authors declare no competing financial interests.
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Yanai, N., Kitayama, K., Hijikata, Y. et al. Gas detection by structural variations of fluorescent guest molecules in a flexible porous coordination polymer. Nature Mater 10, 787–793 (2011). https://doi.org/10.1038/nmat3104
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