title: Gas detection by structural variations of fluorescent guest molecules in a flexible porous coordination polymer.
abstract: 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.
authors: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors: Nobuhiro
authors: N
authors: Yanai
authors: Koji
authors: K
authors: Kitayama
authors: Yuh
authors: Y
authors: Hijikata
authors: Hiroshi
authors: H
authors: Sato
authors: Ryotaro
authors: R
authors: Matsuda
authors: Yoshiki
authors: Y
authors: Kubota
authors: Masaki
authors: M
authors: Takata
authors: Motohiro
authors: M
authors: Mizuno
authors: Takashi
authors: T
authors: Uemura
authors: Susumu
authors: S
authors: Kitagawa