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5. CONCLUSIONS
This study presents the characterization of rutile particles
suspended in aqueous solutions of pivalic acid using IR
absorption. The diamond prism, used for total reflection of IR
light, provided a convenient and reliable method to study the IR
absorption spectrum of suspensions under UV light irradiation.
When rutile particles were introduced into the solutions, the
vibrational bands associated with the COH group of pivalic acid
disappeared, indicating the dissociative adsorption of pivalic
acid onto the particles. The adsorbed pivalate anions were found
to capture photoexcited holes, releasing CO2 and hydrocarbons.
In the suspension exposed to an N2 atmosphere, the excited
electrons remained within the particles as small polarons,
exhibiting optical absorption centered at 7000 cm−1. In contrast,
when the suspension was exposed to air, the electrons were
consumed to produce water, preventing the presence of polaroninduced absorption. Overall, this research demonstrates the
feasibility of the ATR-based IR spectroscopy for the operando
characterization of photochemical reactions at liquid−solid
interfaces. This was achieved by simultaneously monitoring
vibrational and electronic transitions.
Article
AUTHOR INFORMATION
Corresponding Authors
Zhebin Fu − Department of Chemistry, School of Science, Kobe
University, Kobe, Hyogo 657-8501, Japan; Research Institute
for Integrated Science, Kanagawa University, Yokohama,
Kanagawa 221-8686, Japan; orcid.org/0000-0003-10174955; Email: fu-zhebin@kanagawa-u.ac.jp
33829
https://doi.org/10.1021/acsomega.3c04330
ACS Omega 2023, 8, 33825−33830
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http://pubs.acs.org/journal/acsodf
Article
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https://www.tcichemicals.com/TH/en/p/P0461.
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CRC Handbook of Chemistry and Physics, 92nd ed.; Haynes, W. M., Lide,
D. R., Eds.; CRC Press: Boca Raton, FL, 2011; Chapter 10 and 12.
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