Detection and Characterization of Hydride Ligands in Copper Complexes by Hard X-Ray Spectroscopy.
Lorena FritschPia RehsiesWael BarakatDeven P EstesMatthias BauerPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2024)
Transition metal complexes, particularly copper hydrides, play an important role in various catalytic processes and molecular inorganic chemistry. This study employs synchrotron hard X-ray spectroscopy to gain insights into the geometric and electronic properties of copper hydrides as potential catalysts for CO 2 hydrogenation. The potential of high energy resolution X-ray absorption near-edge structure (HERFD-XANES) and valence-to-core X-ray emission (VtC-XES) is demonstrated with measurement on Stryker's reagent (Cu 6 H 6 ) and [Cu 3 (μ 3 -H)(dpmppe) 2 ](PF 6 ) 2 (Cu 3 H), alongside a non-hydride copper compound ICu(dtbppOH) (Cuy-I). The XANES analysis reveals that coordination geometries strongly influence the spectra, providing only indirect details about hydride coordination. The VtC-XES analysis exhibits a distinct signal around 8975 eV, offering a diagnostic tool to identify hydride ligands. Theoretical calculations support and extend these findings by comparing hydride-containing complexes with their hydride-free counterparts.
Keyphrases
- high resolution
- dual energy
- transition metal
- single molecule
- oxide nanoparticles
- electron microscopy
- metal organic framework
- intensive care unit
- computed tomography
- density functional theory
- mass spectrometry
- solid state
- aqueous solution
- magnetic resonance
- risk assessment
- climate change
- label free
- mechanical ventilation
- extracorporeal membrane oxygenation
- monte carlo
- real time pcr