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Title: Direct Determination of Absolute Absorption Cross Sections at the L-Edge of Dilute Mn Complexes in Solution Using a Transmission Flatjet

Journal Article · · Inorganic Chemistry
ORCiD logo [1];  [2];  [3];  [4];  [5];  [2];  [6];  [6]; ORCiD logo [6]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [1]
  1. Helmholtz Center for Materials and Energy, Berlin (Germany). Inst. for Methods and Instrumentation for Synchrotron Radiation Research
  2. Uppsala Univ. (Sweden). Dept. of Chemistry. Ångström Lab.
  3. Max Born Inst. for Nonlinear Optics and Short Pulse Spectroscopy, Berlin (Germany)
  4. Univ. of Manchester at Harwell, Didcot (United Kingdom). The School of Chemistry
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division

The 3d transition metals play a pivotal role in many charge transfer processes in catalysis and biology. X-ray absorption spectroscopy at the L-edge of metal sites probes metal 2p–3d excitations, providing key access to their valence electronic structure, which is crucial for understanding these processes. In this paper, we report L-edge absorption spectra of MnII(acac)2 and MnIII(acac)3 complexes in solution, utilizing a liquid flatjet for X-ray absorption spectroscopy in transmission mode. With this, we derive absolute absorption cross-sections for the L-edge transitions with peak magnitudes as large as 12 and 9 Mb for MnII(acac)2 and MnIII(acac)3, respectively. We provide insight into the electronic structure with ab initio restricted active space calculations of these L-edge transitions, reproducing the experimental spectra with excellent agreement in terms of shapes, relative energies, and relative intensities for the two complexes. Crystal field multiplet theory is used to assign spectral features in terms of the electronic structure. Comparison to charge transfer multiplet calculations reveals the importance of charge transfer in the core-excited final states. Finally, on the basis of our experimental observations, we extrapolate the feasibility of 3d transition metal L-edge absorption spectroscopy using the liquid flatjet approach in probing highly dilute biological solution samples and possible extensions to table-top soft X-ray sources.

Research Organization:
Helmholtz Center for Materials and Energy, Berlin (Germany); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Max Born Inst. for Nonlinear Optics and Short Pulse Spectroscopy, Berlin (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States); Uppsala Univ. (Sweden)
Sponsoring Organization:
German Research Foundation (DFG); Human Frontier Science Program (HFSP); Knut and Alice Wallenberg Foundation (Sweden); National Inst. of Health (NIH) (United States); Swedish Research Council; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1461761
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 9 Vol. 57; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

X-ray-induced sample damage at the Mn L-edge: a case study for soft X-ray spectroscopy of transition metal complexes in solution journal January 2018
The nature of frontier orbitals under systematic ligand exchange in (pseudo-)octahedral Fe( ii ) complexes journal January 2018
Chemical interactions and dynamics with femtosecond X-ray spectroscopy and the role of X-ray free-electron lasers journal April 2019
Source noise suppression in attosecond transient absorption spectroscopy by edge-pixel referencing text January 2020
The nature of frontier orbitals under systematic ligand exchange in (pseudo-)octahedral Fe( ii ) complexes journal January 2018
Probing the oxidation state of transition metal complexes: a case study on how charge and spin densities determine Mn L-edge X-ray absorption energies journal January 2018
Photoinduced anisotropic distortion as the electron trapping site of tungsten trioxide by ultrafast W L 1 -edge X-ray absorption spectroscopy with full potential multiple scattering calculations journal January 2020
Chemical interactions and dynamics with femtosecond X-ray spectroscopy and the role of X-ray free-electron lasers journal April 2019
Probing the oxidation state of transition metal complexes text January 2019
Chemical interactions and dynamics with femtosecond X-ray spectroscopy and the role of X-ray free-electron lasers text January 2019

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