Helmholtz-Zentrum Dresden-Rossendorf

Chemistry of the f-elements

PD Dr. habil. Moritz Schmidt

Head Chemistry of the f-elements

Porträt PD Dr. habil. Schmidt, Moritz; FWOF

Phone

+49 351 260 3156, +49 351 260 2536

Email

moritz.schmidtAthzdr.de

Link

ORCID: 0000-0002-8419-0811

Address
Building/Office

Bautzner Landstraße 400 - 01328 Dresden
801/P249, 850/16.1

Scientific career

  • Current:
    Head of the department "Chemistry of the f-elements" Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology.
  • 2013 – 2018:
    Helmholtz Young Investigator group leader at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology.
  • 2012 – 2013:
    Research associate at the Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal.
  • 2010 – 2012:
    Research Associate at Argonne National Laboratory (ANL), Chemical Sciences and Engineering Division.
  • 11/2009:
    PhD at the University of Heidelberg, Department of Chemistry, “Untersuchungen zum Einbaumechanismus von Actiniden und Lanthaniden in Calcium-haltige Sekundärphasen” (in German).
  • 2006 – 2009:
    PhD student at the Forschungszentrum Karlsruhe, Institute for Nuclear Waste Disposal.
  • 2006:
    Diplom (M.Sc.) in Chemistry at the University of Heidelberg

Research experience

  • Actinide chemistry
  • Geochemistry of the actinides in the context of nuclear waste storage
  • Mineral/water interface reactions
  • Structural incorporation of actinides into mineral phases
  • Site-selective time-resolved laser fluorescence spectroscopy with Cm(III) and Eu(III)
  • Surface X-ray diffraction

Newest Publication in the Department

[Tc(NO)Cl₂(PPh₃)₂(CH₃CN)] and Its Reactions with 2,2′-Dipyridyl Dichalcogenides

Sawallisch, T. E.; Rupf, S. M.; Abdulkader, A.; Ernst, M. J.; Roca Jungfer, M.; Abram, U.

Abstract

The sparingly soluble technetium(I) complex [Tcᴵ(NO)Cl₂(PPh₃)₂(CH₃CN)] (1) slowly dissolves during reactions with 2,2′-dipyridyl ditelluride, (2-pyTe)₂, 2,2′-dipyridyl diselenide, (2-pySe)₂, or 2,2′-dipyridyl disulfide, (2-pyS)₂, under formation of deeply colored solutions. Blue (Te compound) or red solids (Se compound) of the composition [{Tcᴵ(NO)Cl₂(PPh₃)₂}₂{µ₂-(2-pyE)₂}], E = Te (3), Se (4), precipitate from the reaction solutions upon addition of toluene. They represent the first technetium complexes with dichalcogenides. While [{Tcᴵ(NO)Cl₂(PPh₃)}₂{µ₂-(2-pyTe)₂}] (3) is the sole product, a small amount of a second product, [Tcᴵᴵ(NO)Cl₂(PPh₃)(2-pySe)] (5), was obtained from the respective mother solution of the reaction with the diselenide. From the corresponding reaction between 1 and (2-pyS)₂, the technetium(II) compound, [Tcᴵᴵ(NO)Cl₂(PPh₃)(2-pyS)] (6), could be isolated exclusively. The products were studied by single-crystal X-ray diffraction and spectroscopic methods including ⁹⁹Tc NMR for the technetium(I) products and EPR spectroscopy for the Tc(II) complexes. The experimental results are accompanied by DFT considerations, which help to rationalize the experimental observations.

Keywords: technetium; nitrosyls; dichalcogenides; 2-Pyridyl chalcogenolates; NMR; EPR; X-ray diffraction

Downloads

Permalink: https://www.hzdr.de/publications/Publ-41011

More publications

Grants and Projects

  • Bioinspired polyhydroxamic sequestering agents for the in vivo decorporation of actinides
    (ActiDecorp, ANR/DFG, 04/2024-03/2027)
  • Actinide-metal-bonding at the atomic level
    (Am-BALL, BMUV, 05/2023-04/2026)
  • Investigation of the interactions of f-elements with biologically-relevant structural motives: Determination of structure-effect principles for a mobilization in the environment
    (FENABIUM-II, BMBF, 04/2023-03/2026)
  • Competition and Reversibility of sorption processes
    (KuRSiV, BMUV, 01/2023-06/2026)
  • Spectroscopic characterization of f-Element complexes with soft donor ligands
    (f-Char, BMBF, 10/2020 - 03/2024)
  • Structure effect relations between f-elements and organic ligands with natural-analogue binding modes in regards to a possible mobilization in the environment
    (FENABIUM, BMBF, 10/2016 – 05/2021)
  • Smart-Kd applications for the long term safety assessment of nuclear waste disposal sites
    (SMILE, BMWi, 09/2018 – 02/2022)
  • Helmholtz Young Investigator Group “Structures and reactivity at the aqueous/mineral interface”
    (VH-NG-942, Helmholtz Association, 10/2013 - 09/2018)