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Restricted intramolecular rotation of fluorescent molecular rotors at the periphery of aqueous microdroplets in oil

Title
Restricted intramolecular rotation of fluorescent molecular rotors at the periphery of aqueous microdroplets in oil
Authors
Kang, JooyounLhee, SangMoonLee, Jae KyooZare, Richard N.Nam, Hong Gil
DGIST Authors
Kang, Jooyoun; Lhee, SangMoon; Lee, Jae Kyoo; Zare, Richard N.; Nam, Hong Gil
Issue Date
2020-10
Citation
Scientific Reports, 10(1), 16859
Type
Article
Article Type
Article
Keywords
SURFACEWATERINTERFACEVISCOSITYOXIDATIONIONS
ISSN
2045-2322
Abstract
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. © 2020, The Author(s).
URI
http://hdl.handle.net/20.500.11750/12595
DOI
10.1038/s41598-020-73980-7
Publisher
Nature Publishing Group
Related Researcher
  • Author Nam, Hong Gil CBRG(Complex Biology Research Group)
  • Research Interests Plant Aging and Life History; Systems Biology; Complexbiology; Comparative Aging Research
Files:
Collection:
Department of New BiologyCBRG(Complex Biology Research Group)1. Journal Articles


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