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Title: Ca K-Edge XAS as a Probe of Calcium Centers in Complex Systems

Journal Article · · Inorganic Chemistry
DOI:https://doi.org/10.1021/ic501991e· OSTI ID:1170248
 [1];  [2];  [2];  [3];  [3];  [4];  [5];  [1];  [1];  [2];  [2];  [4];  [3];  [2];  [6]
  1. Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
  2. Univ. Grenoble Alpes, DCM and CNRS, DCM, F-38000 Grenoble, France
  3. California Institute of Technology, Department of Chemistry, Pasadena, California 91125, United States
  4. Lawrence Berkeley National Laboratory − Physical Biosciences Division, Berkeley, California 94720, United States
  5. Laboratoire de Reconnaissance Ionique et Chimie de Coordination (LCIB, SCIB, INAC, CEA Grenoble), 38054 Grenoble Cedex 9, France
  6. Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany, Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States

Calcium K-edge pre-edges coupled with TD-DFT theoretical calculation of spectra provide a powerful approach for the characterization of complex calcium centers in inorganic and bioinorganic chemistry. Herein, Ca K-edge X-ray absorption spectroscopy (XAS) is developed as a means to characterize the local environment of calcium centers. The spectra for six, seven, and eight coordinate inorganic and molecular calcium complexes were analyzed and determined to be primarily influenced by the coordination environment and site symmetry at the calcium center. The experimental results are closely correlated to time-dependent density functional theory (TD-DFT) calculations of the XAS spectra. The applicability of this methodology to complex systems was investigated using structural mimics of the oxygen-evolving complex (OEC) of PSII. It was found that Ca K-edge XAS is a sensitive probe for structural changes occurring in the cubane heterometallic cluster due to Mn oxidation. Future applications to the OEC are discussed.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; R01 GM102687A; CM1202; ANR-13-BS07-0015-01; AC02-76SF00515
OSTI ID:
1170248
Alternate ID(s):
OSTI ID: 1214646; OSTI ID: 1215432; OSTI ID: 1512168
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Vol. 54 Journal Issue: 4; ISSN 0020-1669
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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