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Kang, Joo Youn
식물 노화·수명 연구단
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Restricted intramolecular rotation of fluorescent molecular rotors at the periphery of aqueous microdroplets in oil

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Title
Restricted intramolecular rotation of fluorescent molecular rotors at the periphery of aqueous microdroplets in oil
Author(s)
Jooyoun Kang; SangMoon Lhee; Jae Kyoo Lee; Richard N. Zare; HongGil Nam
Publication Date
2020-12
Journal
SCIENTIFIC REPORTS, v.10, no.1, pp.1 - 10
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2020, The Author(s). Fluorescent molecular rotor dyes, including Cy3, Cy5, and Alexa Fluor 555, dissolved in micron-sized aqueous droplets (microdroplets) in oil were excited, and the fluorescence intensity was recorded as function of time. We observed lengthening of the fluorescence lifetime of these dyes at the water–oil periphery, which extended several microns inward. This behavior shows that intramolecular rotation is restricted at and near the microdroplet interface. Lengthened lifetimes were observed in water microdroplets but not in microdroplets composed of organic solvents. This lifetime change was relatively insensitive to added glycerol up to 60%, suggesting that solution viscosity is not the dominant mechanism. These restricted intramolecular rotations at and near the microdroplet periphery are consistent with the reduced entropy observed in chemical reactions in microdroplets compared to the same reaction conditions in bulk solution and helps us further understand why microdroplet chemistry differs so markedly from bulk-phase chemistry
URI
https://pr.ibs.re.kr/handle/8788114/7525
DOI
10.1038/s41598-020-73980-7
ISSN
2045-2322
Appears in Collections:
Center for Plant Aging Research (식물 노화·수명 연구단) > 1. Journal Papers (저널논문)
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