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Title: Elucidation of the photoaquation reaction mechanism in ferrous hexacyanide using synchrotron x-rays with sub-pulse-duration sensitivity

Abstract

Ligand substitution reactions are common in solvated transition metal complexes, and harnessing them through initiation with light promises interesting practical applications, driving an interest in new means of probing their mechanisms. In this work, using a combination of timeresolved x-ray absorption spectroscopy (XAS) and hybrid quantum mechanical, molecular mechanics (QM/MM) molecular dynamics (MD) simulations and x-ray absorption nearedge spectroscopy (XANES) calculations, we elucidate the mechanism of photoaquation in the model system iron(II) hexacyanide, where UV excitation results in the exchange of a CN ligand with a water molecule from the solvent. We take advantage of the high flux and stability of synchrotron x-rays to capture high precision x-ray absorption spectra that allow us to overcome the usual limitation of the relatively long x-ray pulses and extract the spectrum of the short-lived intermediate pentacoordinated species. Additionally, we determine its lifetime to be 19 (±5) ps and kinetic fits suggest a formation time of 1.5 (0.6) ps. The QM/MM simulations support our experimental findings and explain the ~20 ps timescale for aquation as involving interconversion between the square pyramidal (SP) and trigonal bipyramidal (TBP) pentacoordinated geometries, with aquation being only active in the SP configuration.

Authors:
ORCiD logo [1];  [1];  [2];  [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [3];  [2]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [4]; ORCiD logo [2];  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
  3. Lund Univ. (Sweden)
  4. European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
  5. Hungarian Academy Sciences, Budapest (Hungary). Wigner Research Centre for Physics
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Science (SC), Biological and Environmental Research (BER); Tryggers Science Foundation; Hungarian Academy of Sciences; Government of Hungary; European Regional Development Fund (ERDF); Hungarian National Research, Development and Innovation Office (NRDI); European XFEL; National Science Centre (NCN)
OSTI Identifier:
1608558
Alternate Identifier(s):
OSTI ID: 1570031; OSTI ID: 1607390
Report Number(s):
PNNL-SA-144898
Journal ID: ISSN 0021-9606; TRN: US2104924
Grant/Contract Number:  
AC05-76RL01830; AC02-06CH11357; KC030103172684; AC02-05CH11231; LP2013-59; VEKOP-2.3.2-16-2017-00015; NKFIH FK 124460; 2016/22/E/ST4/00543; AC05-76RL1830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 151; Journal Issue: 14; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Synchrotrons; Quantum mechanical/molecular mechanical calculations; Laser physics; Triplet state; Molecular dynamics; Substitution reactions; Density functional theory; X-ray absorption spectroscopy; Photochemical reactions; Free electron lasers

Citation Formats

March, Anne Marie, Doumy, Gilles, Andersen, Amity, Al Haddad, Andre, Kumagai, Yoshiaki, Tu, Ming-Feng, Bang, Joohee, Bostedt, Christoph, Uhlig, Jens, Nascimento, Daniel R., Assefa, Tadesse A., Németh, Zoltán, Vankó, György, Gawelda, Wojciech, Govind, Niranjan, and Young, Linda. Elucidation of the photoaquation reaction mechanism in ferrous hexacyanide using synchrotron x-rays with sub-pulse-duration sensitivity. United States: N. p., 2019. Web. doi:10.1063/1.5117318.
March, Anne Marie, Doumy, Gilles, Andersen, Amity, Al Haddad, Andre, Kumagai, Yoshiaki, Tu, Ming-Feng, Bang, Joohee, Bostedt, Christoph, Uhlig, Jens, Nascimento, Daniel R., Assefa, Tadesse A., Németh, Zoltán, Vankó, György, Gawelda, Wojciech, Govind, Niranjan, & Young, Linda. Elucidation of the photoaquation reaction mechanism in ferrous hexacyanide using synchrotron x-rays with sub-pulse-duration sensitivity. United States. https://doi.org/10.1063/1.5117318
March, Anne Marie, Doumy, Gilles, Andersen, Amity, Al Haddad, Andre, Kumagai, Yoshiaki, Tu, Ming-Feng, Bang, Joohee, Bostedt, Christoph, Uhlig, Jens, Nascimento, Daniel R., Assefa, Tadesse A., Németh, Zoltán, Vankó, György, Gawelda, Wojciech, Govind, Niranjan, and Young, Linda. Thu . "Elucidation of the photoaquation reaction mechanism in ferrous hexacyanide using synchrotron x-rays with sub-pulse-duration sensitivity". United States. https://doi.org/10.1063/1.5117318. https://www.osti.gov/servlets/purl/1608558.
@article{osti_1608558,
title = {Elucidation of the photoaquation reaction mechanism in ferrous hexacyanide using synchrotron x-rays with sub-pulse-duration sensitivity},
author = {March, Anne Marie and Doumy, Gilles and Andersen, Amity and Al Haddad, Andre and Kumagai, Yoshiaki and Tu, Ming-Feng and Bang, Joohee and Bostedt, Christoph and Uhlig, Jens and Nascimento, Daniel R. and Assefa, Tadesse A. and Németh, Zoltán and Vankó, György and Gawelda, Wojciech and Govind, Niranjan and Young, Linda},
abstractNote = {Ligand substitution reactions are common in solvated transition metal complexes, and harnessing them through initiation with light promises interesting practical applications, driving an interest in new means of probing their mechanisms. In this work, using a combination of timeresolved x-ray absorption spectroscopy (XAS) and hybrid quantum mechanical, molecular mechanics (QM/MM) molecular dynamics (MD) simulations and x-ray absorption nearedge spectroscopy (XANES) calculations, we elucidate the mechanism of photoaquation in the model system iron(II) hexacyanide, where UV excitation results in the exchange of a CN– ligand with a water molecule from the solvent. We take advantage of the high flux and stability of synchrotron x-rays to capture high precision x-ray absorption spectra that allow us to overcome the usual limitation of the relatively long x-ray pulses and extract the spectrum of the short-lived intermediate pentacoordinated species. Additionally, we determine its lifetime to be 19 (±5) ps and kinetic fits suggest a formation time of 1.5 (0.6) ps. The QM/MM simulations support our experimental findings and explain the ~20 ps timescale for aquation as involving interconversion between the square pyramidal (SP) and trigonal bipyramidal (TBP) pentacoordinated geometries, with aquation being only active in the SP configuration.},
doi = {10.1063/1.5117318},
journal = {Journal of Chemical Physics},
number = 14,
volume = 151,
place = {United States},
year = {Thu Oct 10 00:00:00 EDT 2019},
month = {Thu Oct 10 00:00:00 EDT 2019}
}

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Cited by: 22 works
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Figures / Tables:

FIG. 1 FIG. 1: Ground state XANES spectra of [FeII(CN)6]4−(solid) and [FeIII(CN)6]3−(dotted). Inset shows a zoom of the pre-edge region.

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Ultralow-intensity near-infrared light induces drug delivery by upconverting nanoparticles
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The missing term in effective pair potentials
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Works referencing / citing this record:

X-ray tracking of structural changes during a subnanosecond solid-solid phase transition in cobalt nanoparticles
journal, December 2019


Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.