« Previous Abstract"Optimal defense strategy against herbivory in plants: conditions selecting for induced defense, constitutive defense, and no-defense"    Next AbstractThe toxicological analysis of secondary organic aerosol in human lung epithelial cells and macrophages »

Chemistry

Title:		Reversible Vapochromic Luminescence Accompanied by Planar Half-Chair Conformational Change of a Propeller-Shaped Boron beta-Diketiminate Complex
Author(s):		Ito S; Yaegashi M; Tanaka K; Chujo Y;
Address:		"Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 6158510, Japan"
Journal Title:		Chemistry
Year:		2021
Volume:		20210527
Issue:		36
Page Number:		9302 - 9312
DOI:		10.1002/chem.202101107
ISSN/ISBN:		1521-3765 (Electronic) 0947-6539 (Linking)
Abstract:		"Leakage of volatile organic compounds (VOCs) is one of the most severe industrial problems, because it can cause environmental pollution, global warming, fire, and explosion. Hence, the visualization of leakage is an essential technology to detect it at an early stage. Molecular crystals, fluorescence color of which can be changed by the exposure to VOCs could potentially serve as the sensing materials for realizing rapid and facile VOC detection. However, these materials usually require harsh conditions, such as heating or a vacuum, to recover their initial phases for reuse. Therefore, it remains a challenge to obtain completely reversible sensing systems without such energy-consuming recycling processes. Herein, the reversible color change of fluorescence from the crystals of a propeller-shaped boron beta-diketiminate complex is reported. The complex was crystallized in distinct crystalline phases having different luminescent colors. Importantly, these phases were interconverted very rapidly (time constant <60 s) and repeatedly upon exposure to the vapors of the appropriate VOCs. The small energy differences between conformers of the complex could lead to this pseudopolymorphic behavior. This finding could be applied for the development of further eco-friendly reversible sensing materials based on four-coordinated boron complexes"
Keywords:		boron complexes crystal transition crystallization-induced emission fluorescence vapochromism;
Notes:		"PubMed-not-MEDLINEIto, Shunichiro Yaegashi, Misao Tanaka, Kazuo Chujo, Yoshiki eng JP24102013/Japan Society for the Promotion of Science/ 20K22532P/Japan Society for the Promotion of Science/ 17J10444/Japan Society for the Promotion of Science/ Germany 2021/05/08 Chemistry. 2021 Jun 25; 27(36):9302-9312. doi: 10.1002/chem.202101107. Epub 2021 May 27"