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Title: X-ray Emission Spectroscopy of Mn Coordination Complexes Toward Interpreting the Electronic Structure of the Oxygen-Evolving Complex of Photosystem II

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [1];  [2];  [3];  [2];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
  3. Univ. of Washington, Seattle, WA (United States)

X-ray emission (XES) spectroscopy is an attractive technique for analysis of the electronic structure of molecules, materials, and metalloproteins. However, a better understanding of XES results is required. Using a combination of experiment and ground-state density functional theory analysis, we rationalize differences in the X-ray emission spectra of multinuclear Mn complexes. Model compounds, including dinuclear [Mn2O2L'4](ClO4)3 (L'= 2,2'-bipyridyl, [1]) and two examples from the Mn4O4L6 “cubane” family of model compounds (L = (p-R-C6H4)PO2, R = OCH3 [2], CH3 [3] ), were compared with the Oxygen Evolving Complex of Photosystem II. Our analysis demonstrates that changes in the structure of the Mn complexes, resulting in changes to the spin polarization, can introduce significant spectral shifts in compounds of the same formal redox state. The implications of changes in spin polarization for understanding photosynthetic water-splitting catalysis is discussed.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
DGE0833366; DGE0903675; FG02-09ER16106; AC02-06CH11357
OSTI ID:
1239425
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 6; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (12)

A Spotlight on the Compatibility between XFEL and Ab Initio Structures of the Oxygen Evolving Complex in Photosystem II journal April 2017
What Mn K β spectroscopy reveals concerning the oxidation states of the Mn cluster in photosystem II journal January 2017
A compact dispersive refocusing Rowland circle X-ray emission spectrometer for laboratory, synchrotron, and XFEL applications journal July 2017
Assessment of the manganese cluster’s oxidation state via photoactivation of photosystem II microcrystals journal December 2019
Theory of chemical bonds in metalloenzymes XXI. Possible mechanisms of water oxidation in oxygen evolving complex of photosystem II journal December 2017
Theory of chemical bonds in metalloenzymes XXII: a concerted bond-switching mechanism for the oxygen–oxygen bond formation coupled with one electron transfer for water oxidation in the oxygen-evolving complex of photosystem II journal December 2018
The S3 State of the Oxygen-Evolving Complex: Overview of Spectroscopy and XFEL Crystallography with a Critical Evaluation of Early-Onset Models for O–O Bond Formation journal April 2019
Theory of chemical bonds in metalloenzymes XXII: a concerted bond-switching mechanism for the oxygen–oxygen bond formation coupled with one electron transfer for water oxidation in the oxygen-evolving complex of photosystem II text January 2018
Theory of chemical bonds in metalloenzymes XXI. Possible mechanisms of water oxidation in oxygen evolving complex of photosystem II text January 2018
Theory of chemical bonds in metalloenzymes XXII: a concerted bond-switching mechanism for the oxygen–oxygen bond formation coupled with one electron transfer for water oxidation in the oxygen-evolving complex of photosystem II text January 2018
A Compact Dispersive Refocusing Rowland Circle X-ray Emission Spectrometer for Laboratory, Synchrotron, and XFEL Applications text January 2017
Theory of chemical bonds in metalloenzymes XXI. Possible mechanisms of water oxidation in oxygen evolving complex of photosystem II text January 2018