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Title: Detailed Characterization of a Nanosecond-Lived Excited State: X-ray and Theoretical Investigation of the Quintet State in Photoexcited [Fe(terpy) 2 ] 2+

Abstract

Theoretical predictions show that depending on the populations of the Fe 3dxy, 3dxz, and 3dyz orbitals two possible quintet states can exist for the high-spin state of the photoswitchable model system [Fe(terpy)2]2+. The differences in the structure and molecular properties of these 5B2 and 5E quintets are very small and pose a substantial challenge for experiments to resolve them. Yet for a better understanding of the physics of this system, which can lead to the design of novel molecules with enhanced photoswitching performance, it is vital to determine which high-spin state is reached in the transitions that follow the light excitation. The quintet state can be prepared with a short laser pulse and can be studied with cutting-edge time-resolved X-ray techniques. Here we report on the application of an extended set of X-ray spectroscopy and scattering techniques applied to investigate the quintet state of [Fe(terpy)2]2+ 80 ps after light excitation. High-quality X-ray absorption, nonresonant emission, and resonant emission spectra as well as X-ray diffuse scattering data clearly reflect the formation of the high-spin state of the [Fe(terpy)2]2+ molecule; moreover, extended X-ray absorption fine structure spectroscopy resolves the Fe–ligand bond-length variations with unprecedented bond-length accuracy in time-resolved experiments. With ab initiomore » calculations we determine why, in contrast to most related systems, one configurational mode is insufficient for the description of the low-spin (LS)–high-spin (HS) transition. We identify the electronic structure origin of the differences between the two possible quintet modes, and finally, we unambiguously identify the formed quintet state as 5E, in agreement with our theoretical expectations.« less

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [5];  [5];  [6];  [6];  [2];  [2];  [2];  [2];  [7];  [3];  [3];  [1] more »;  [1];  [1];  [8];  [8];  [2];  [4];  [4];  [5];  [5] « less
  1. Hungarian Academy Sciences, Budapest (Hungary)
  2. Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Physics
  3. European Synchrotron Radiation Facility (ESRF), Cedex (France)
  4. Argonne National Lab., IL (United States). Advanced Photon Source
  5. European XFEL, Hamburg (Germany)
  6. Sorbonne Universites - UPMC Univ. Paris (France)
  7. SLAC National Accelerator Center, Menlo Park, CA (United States)
  8. Lund Univ. (Sweden). Dept. of Chemical Physics
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1208941
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 119; Journal Issue: 11; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Vanko, Gyorgy, Bordage, Amelie, Papai, Matyas, Haldrup, Kristoffer, Glatzel, Pieter, March, Anne Marie, Doumy, Gilles, Britz, Alexander, Galler, Andreas, Assefa, Tadesse, Cabaret, Delphine, Juhin, Amelie, van Driel, Tim B., Kjær, Kasper S., Dohn, Asmus, Møller, Klaus B., Lemke, Henrik T., Gallo, Erik, Rovezzi, Mauro, Németh, Zoltán, Rozsályi, Emese, Rozgonyi, Tamás, Uhlig, Jens, Sundström, Villy, Nielsen, Martin M., Young, Linda, Southworth, Stephen H., Bressler, Christian, and Gawelda, Wojciech. Detailed Characterization of a Nanosecond-Lived Excited State: X-ray and Theoretical Investigation of the Quintet State in Photoexcited [Fe(terpy) 2 ] 2+. United States: N. p., 2015. Web. doi:10.1021/acs.jpcc.5b00557.
Vanko, Gyorgy, Bordage, Amelie, Papai, Matyas, Haldrup, Kristoffer, Glatzel, Pieter, March, Anne Marie, Doumy, Gilles, Britz, Alexander, Galler, Andreas, Assefa, Tadesse, Cabaret, Delphine, Juhin, Amelie, van Driel, Tim B., Kjær, Kasper S., Dohn, Asmus, Møller, Klaus B., Lemke, Henrik T., Gallo, Erik, Rovezzi, Mauro, Németh, Zoltán, Rozsályi, Emese, Rozgonyi, Tamás, Uhlig, Jens, Sundström, Villy, Nielsen, Martin M., Young, Linda, Southworth, Stephen H., Bressler, Christian, & Gawelda, Wojciech. Detailed Characterization of a Nanosecond-Lived Excited State: X-ray and Theoretical Investigation of the Quintet State in Photoexcited [Fe(terpy) 2 ] 2+. United States. https://doi.org/10.1021/acs.jpcc.5b00557
Vanko, Gyorgy, Bordage, Amelie, Papai, Matyas, Haldrup, Kristoffer, Glatzel, Pieter, March, Anne Marie, Doumy, Gilles, Britz, Alexander, Galler, Andreas, Assefa, Tadesse, Cabaret, Delphine, Juhin, Amelie, van Driel, Tim B., Kjær, Kasper S., Dohn, Asmus, Møller, Klaus B., Lemke, Henrik T., Gallo, Erik, Rovezzi, Mauro, Németh, Zoltán, Rozsályi, Emese, Rozgonyi, Tamás, Uhlig, Jens, Sundström, Villy, Nielsen, Martin M., Young, Linda, Southworth, Stephen H., Bressler, Christian, and Gawelda, Wojciech. 2015. "Detailed Characterization of a Nanosecond-Lived Excited State: X-ray and Theoretical Investigation of the Quintet State in Photoexcited [Fe(terpy) 2 ] 2+". United States. https://doi.org/10.1021/acs.jpcc.5b00557. https://www.osti.gov/servlets/purl/1208941.
@article{osti_1208941,
title = {Detailed Characterization of a Nanosecond-Lived Excited State: X-ray and Theoretical Investigation of the Quintet State in Photoexcited [Fe(terpy) 2 ] 2+},
author = {Vanko, Gyorgy and Bordage, Amelie and Papai, Matyas and Haldrup, Kristoffer and Glatzel, Pieter and March, Anne Marie and Doumy, Gilles and Britz, Alexander and Galler, Andreas and Assefa, Tadesse and Cabaret, Delphine and Juhin, Amelie and van Driel, Tim B. and Kjær, Kasper S. and Dohn, Asmus and Møller, Klaus B. and Lemke, Henrik T. and Gallo, Erik and Rovezzi, Mauro and Németh, Zoltán and Rozsályi, Emese and Rozgonyi, Tamás and Uhlig, Jens and Sundström, Villy and Nielsen, Martin M. and Young, Linda and Southworth, Stephen H. and Bressler, Christian and Gawelda, Wojciech},
abstractNote = {Theoretical predictions show that depending on the populations of the Fe 3dxy, 3dxz, and 3dyz orbitals two possible quintet states can exist for the high-spin state of the photoswitchable model system [Fe(terpy)2]2+. The differences in the structure and molecular properties of these 5B2 and 5E quintets are very small and pose a substantial challenge for experiments to resolve them. Yet for a better understanding of the physics of this system, which can lead to the design of novel molecules with enhanced photoswitching performance, it is vital to determine which high-spin state is reached in the transitions that follow the light excitation. The quintet state can be prepared with a short laser pulse and can be studied with cutting-edge time-resolved X-ray techniques. Here we report on the application of an extended set of X-ray spectroscopy and scattering techniques applied to investigate the quintet state of [Fe(terpy)2]2+ 80 ps after light excitation. High-quality X-ray absorption, nonresonant emission, and resonant emission spectra as well as X-ray diffuse scattering data clearly reflect the formation of the high-spin state of the [Fe(terpy)2]2+ molecule; moreover, extended X-ray absorption fine structure spectroscopy resolves the Fe–ligand bond-length variations with unprecedented bond-length accuracy in time-resolved experiments. With ab initio calculations we determine why, in contrast to most related systems, one configurational mode is insufficient for the description of the low-spin (LS)–high-spin (HS) transition. We identify the electronic structure origin of the differences between the two possible quintet modes, and finally, we unambiguously identify the formed quintet state as 5E, in agreement with our theoretical expectations.},
doi = {10.1021/acs.jpcc.5b00557},
url = {https://www.osti.gov/biblio/1208941}, journal = {Journal of Physical Chemistry. C},
issn = {1932-7447},
number = 11,
volume = 119,
place = {United States},
year = {Thu Mar 19 00:00:00 EDT 2015},
month = {Thu Mar 19 00:00:00 EDT 2015}
}

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