Hydrogen-Bonding-Mediated Molecular Vibrational Suppression for Enhanc…
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논문명 | Hydrogen-Bonding-Mediated Molecular Vibrational Suppression for Enhancing the Fluorescence Quantum Yield Applicable for Visual Phenol Detection |
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저자 | Bo-Hyun Kim, Wontae Kim, Taemin Kim, Byoung Min Ko, Soon-Jik Hong, Kangtaek Lee, Jinsang Kim, Sung-Ho Song and Sunjong Lee |
저널명 | ACS |
게재년월 | 2021/11/8 |
Vol. pp |
It is generally accepted that while efficient suppression of molecular vibration is
inevitable for purely organic phosphors due to their long emission lifetime in the regime of 1
ms or longer, fluorophores having a lifetime in the nanoseconds regime are not sensitive to
collisional quenching. Here, however, we demonstrate that a fluorophore, 2,5-bis(hexyloxy)-
terephthaldehyde (BHTA), capable of having hydrogen bonding (H bonding) via its two
aldehyde groups can have a largely enhanced (450%) fluorescence quantum yield (QY) in
amorphous poly(acrylic acid) (PAA) matrix compared to its crystalline powder. We ascribe
this enhanced QY to the efficient suppression of molecular vibrations via intermolecular H
bonding. We confirm this feasibility by conducting temperature-dependent fluorescence
emission intensity measurement. As gaseous phenol can intervene with the H bonding
between BHTA and PAA, interestingly, BHTA embedded in PAA can selectively detect
gaseous phenol by a sharp fluorescence emission intensity drop that is visibly recognizable by
the naked eye. The results provide an insightful molecular design strategy for a fluorophore
and fluorometric sensory system design for enhanced photoluminescence QY and convenient detection of various volatile organic
compounds.
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