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

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b06602· OSTI ID:1797299

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. In this work, 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 head group 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 seconds, enabling us to track the fluctuating minor structures’ appearance and disappearance on a tens of seconds timescale. 2D IR chemical exchange spectroscopy further shows these structures interconvert in 30 ps. Finally, 2D spectral line shape evolution reveals that it takes the monolayers hours to reach macroscopic structural equilibrium.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR); Knut and Alice Wallenberg Foundation
Grant/Contract Number:
FG02-84ER13251; FA9550-16-1-0104; KAW 2015.0417
OSTI ID:
1797299
Journal Information:
Journal of the American Chemical Society, Vol. 139, Issue 46; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (2)

Enhancing the signal strength of surface sensitive 2D IR spectroscopy journal January 2019
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