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Time‐Dependent Emission Enhancement of the Ethynylpyrene‐ o ‐Carborane Dyad and Its Application as a Luminescent Color Sensor for Evaluating Water Contents in Organic Solvents
Author(s) -
Nishino Kenta,
Yamamoto Hideki,
Ochi Junki,
Tanaka Kazuo,
Chujo Yoshiki
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900396
Subject(s) - acetone , dichloromethane , excimer , chemistry , luminescence , dyad , tetrahydrofuran , photochemistry , emission intensity , analytical chemistry (journal) , carborane , solvent , fluorescence , materials science , chromatography , organic chemistry , ion , optics , optoelectronics , psychology , social psychology , physics
The time‐dependent emission enhancement (TDEE) phenomena of the 1‐( o ‐carboran‐1‐yl)ethynylpyrene dyad were reported. It was found that the emission intensity from the dyad increased in tetrahydrofuran (THF), acetone and dichloromethane with increasing incubation time. From the mechanistic studies, it was suggested that agglomeration of the dyad gradually proceeded in these media, followed by expression of excimer luminescence. Additionally, it was shown that the rates of TDEE of the dyad were sensitively accelerated in the presence of a trace amount of water. Based on this fact, a detection system for water contents in acetone was constructed. Before and after incubation for 96 h at room temperature, time courses of changes in optical properties were monitored. Finally, water contents in acetone can be estimated by the degrees of TDEE and emission color changes in the range from 0.1 wt % to 2.0 wt % and from 2.0 wt % to 20 wt %, respectively.