Premium
Reversible Change in Fluorescent Color of Moisture‐sensitive Binary Films of 4‐[Bis(4‐methylphenyl)amino]benzylideneaniline with Organic Acids
Author(s) -
Tsukada Takuma,
Kitamura Yuya,
Nakano Hideyuki
Publication year - 2021
Publication title -
asian journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.846
H-Index - 44
eISSN - 2193-5815
pISSN - 2193-5807
DOI - 10.1002/ajoc.202000565
Subject(s) - chemistry , fluorescence , photochemistry , protonation , excited state , intermolecular force , moisture , orange (colour) , organic chemistry , molecule , ion , food science , physics , quantum mechanics , nuclear physics
Novel moisture‐sensitive binary films that exhibit reversible change in fluorescent color have been created using a fluorescent amorphous molecular material, 4‐[bis(4‐methylphenyl)amino]benzylideneaniline (BMBZA), with organic acids such as pentafluorobenzoic acid and benzoic acid. Orange fluorescent color of the film under ambient dry atmosphere was found to change drastically to greenish blue under wet atmosphere. Response speed of such color change was quite fast and it responded well to exhaled breath. It was suggested that such change in fluorescent color was due to switching the excited species between BMBZA and its protonated iminium cation, and that the acidity level of the organic acids was an important factor for exhibiting such reversible changes in fluorescent colors. In addition, excited‐state intermolecular proton transfer was suggested to contribute the orange fluorescence under dry atmosphere.