Picosecond sulfur K-edge X-ray absorption spectroscopy with applications to excited state proton transfer
Abstract
Picosecond X-ray absorption (XA) spectroscopy at the S K-edge (~2.4 keV) is demonstrated and used to monitor excited state dynamics in a small organosulfur molecule (2-Thiopyridone, 2TP) following optical excitation. Multiple studies have reported that the thione (2TP) is converted into the thiol (2-Mercaptopyridine, 2MP) following photoexcitation. However, the timescale and photochemical pathway of this reaction remain uncertain. In this work, time-resolved XA spectroscopy at the S K-edge is used to monitor the formation and decay of two transient species following 400nm excitation of 2TP dissolved in acetonitrile. The first transient species forms within the instrument response time (70 ps) and decays within 6 ns. The second transient species forms on a timescale of ~400 ps and decays on a 15 ns timescale. Time-dependent density functional theory is used to identify the first and second transient species as the lowestlying triplet states of 2TP and 2MP, respectively. This study demonstrates transient S K-edge XA spectroscopy as a sensitive and viable probe of time-evolving charge dynamics near sulfur sites in small molecules with future applications towards studying complex biological and material systems.
- Authors:
-
- Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Ultrafast X-ray Science Lab., Chemical Sciences Division
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1379901
- Alternate Identifier(s):
- OSTI ID: 1361883; OSTI ID: 1369310
- Grant/Contract Number:
- AC02-05CH11231; SC0002190; AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Structural Dynamics
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 4; Journal ID: ISSN 2329-7778
- Publisher:
- American Crystallographic Association/AIP
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE
Citation Formats
Van Kuiken, Benjamin E., Ross, Matthew R., Strader, Matthew L., Cordones, Amy A., Cho, Hana, Lee, Jae Hyuk, Schoenlein, Robert W., and Khalil, Munira. Picosecond sulfur K-edge X-ray absorption spectroscopy with applications to excited state proton transfer. United States: N. p., 2017.
Web. doi:10.1063/1.4983157.
Van Kuiken, Benjamin E., Ross, Matthew R., Strader, Matthew L., Cordones, Amy A., Cho, Hana, Lee, Jae Hyuk, Schoenlein, Robert W., & Khalil, Munira. Picosecond sulfur K-edge X-ray absorption spectroscopy with applications to excited state proton transfer. United States. https://doi.org/10.1063/1.4983157
Van Kuiken, Benjamin E., Ross, Matthew R., Strader, Matthew L., Cordones, Amy A., Cho, Hana, Lee, Jae Hyuk, Schoenlein, Robert W., and Khalil, Munira. Mon .
"Picosecond sulfur K-edge X-ray absorption spectroscopy with applications to excited state proton transfer". United States. https://doi.org/10.1063/1.4983157. https://www.osti.gov/servlets/purl/1379901.
@article{osti_1379901,
title = {Picosecond sulfur K-edge X-ray absorption spectroscopy with applications to excited state proton transfer},
author = {Van Kuiken, Benjamin E. and Ross, Matthew R. and Strader, Matthew L. and Cordones, Amy A. and Cho, Hana and Lee, Jae Hyuk and Schoenlein, Robert W. and Khalil, Munira},
abstractNote = {Picosecond X-ray absorption (XA) spectroscopy at the S K-edge (~2.4 keV) is demonstrated and used to monitor excited state dynamics in a small organosulfur molecule (2-Thiopyridone, 2TP) following optical excitation. Multiple studies have reported that the thione (2TP) is converted into the thiol (2-Mercaptopyridine, 2MP) following photoexcitation. However, the timescale and photochemical pathway of this reaction remain uncertain. In this work, time-resolved XA spectroscopy at the S K-edge is used to monitor the formation and decay of two transient species following 400nm excitation of 2TP dissolved in acetonitrile. The first transient species forms within the instrument response time (70 ps) and decays within 6 ns. The second transient species forms on a timescale of ~400 ps and decays on a 15 ns timescale. Time-dependent density functional theory is used to identify the first and second transient species as the lowestlying triplet states of 2TP and 2MP, respectively. This study demonstrates transient S K-edge XA spectroscopy as a sensitive and viable probe of time-evolving charge dynamics near sulfur sites in small molecules with future applications towards studying complex biological and material systems.},
doi = {10.1063/1.4983157},
journal = {Structural Dynamics},
number = 4,
volume = 4,
place = {United States},
year = {Mon May 08 00:00:00 EDT 2017},
month = {Mon May 08 00:00:00 EDT 2017}
}
Web of Science
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