Ultrafast to Ultraslow Dynamics of a Langmuir Monolayer at the Air/Water Interface Observed with Reflection Enhanced 2D IR Spectroscopy

Journal of the American Chemical Society
Chang YanMichael D Fayer

Abstract

Monolayers play important roles in naturally occurring phenomena and technological processes. Monolayers at the air/water interface have received considerable attention, yet it has proven difficult to measure monolayer and interfacial molecular dynamics. Here we employ a new technique, reflection enhanced two-dimensional infrared (2D IR) spectroscopy, on a carbonyl stretching mode of tricarbonylchloro-9-octadecylamino-4,5-diazafluorenerhenium(I) (TReF18) monolayers at two surface densities. Comparison to experiments on a water-soluble version of the metal carbonyl headgroup shows that water hydrogen bond rearrangement dynamics slow from 1.5 ps in bulk water to 3.1 ps for interfacial water. Longer time scale fluctuations were also observed and attributed to fluctuations of the number of hydrogen bonds formed between water and the three carbonyls of TReF18. At the higher surface density, two types of TReF18 minor structures are observed in addition to the main structure. The reflection method can take usable 2D IR spectra on the monolayer within 8 s, enabling us to track the fluctuating minor structures' appearance and disappearance on a tens of seconds time scale. 2D IR chemical exchange spectroscopy further shows these structur...Continue Reading

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Citations

Feb 3, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Stephanie E SandersPoul B Petersen
Jan 17, 2019·The Journal of Chemical Physics·Megan K PettiMartin T Zanni
Jun 10, 2020·Proceedings of the National Academy of Sciences of the United States of America·David J HoffmanMichael D Fayer
Dec 3, 2020·The Journal of Chemical Physics·David J HoffmanMichael D Fayer
Feb 26, 2021·Journal of the American Chemical Society·Sebastian M Fica-ContrerasMichael D Fayer
May 28, 2021·The Journal of Physical Chemistry. B·Rodrigo Noriega
Jul 10, 2021·The Journal of Chemical Physics·Christopher P BaryiamesCarlos R Baiz
Aug 3, 2021·The Journal of Physical Chemistry. B·Sebastian M Fica-ContrerasMichael D Fayer
Jan 26, 2018·The Journal of Physical Chemistry. a·Jia-Jung HoMartin T Zanni
May 1, 2020·Journal of the American Chemical Society·Boning WuMichael D Fayer
May 29, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Katsuhiko ArigaJunbai Li
Apr 8, 2020·The Journal of Physical Chemistry. a·Megan K PettiMartin T Zanni
Sep 4, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Zarrin ShahzadiChaitali Mukhopadhyay
Jul 20, 2018·Journal of the American Chemical Society·Jun NishidaMichael D Fayer
Oct 27, 2018·The Journal of Physical Chemistry. B·Rongfeng YuanMichael Fayer
Dec 14, 2017·The Journal of Physical Chemistry Letters·Jan Philip KraackPeter Hamm
Jul 10, 2018·Journal of the American Chemical Society·Chang YanMichael D Fayer
Apr 16, 2020·Chemical Reviews·Yong-Lei WangMichael D Fayer

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