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Updated: May 14, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Covalency in metal-oxygen multiple bonds evaluated using oxygen K-edge spectroscopy and electronic structure theory
Stefan G Minasian1, Jason M Keith, Enrique R Batista
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
Metal-oxygen bonding in transition metal oxo anions is key for materials innovation. New studies reveal how electronic structure changes across groups and down triads, impacting metal-oxygen interactions.
Area of Science:
- Materials Science
- Catalysis
- Biochemistry
- Inorganic Chemistry
Background:
- Theories of metal-oxygen bonding are crucial for understanding metal oxo properties.
- Spectroscopic analyses of transition metal tetraoxometalate anions (MO4(x-)) have historically informed M-O bonding theories.
Purpose of the Study:
- To evaluate relative changes in metal-oxygen (M-O) orbital mixing in tetraoxometalate anions.
- To investigate M-O bonding trends across Groups 6 and 7 and down transition metal triads.
Main Methods:
- Nonresonant inelastic X-ray scattering (NIXS).
- X-ray absorption spectroscopy (XAS) via fluorescence and scanning transmission X-ray microscopy (STXM).
- Time-dependent density functional theory (TD-DFT) calculations.
Main Results:
- Increased M-O e* (π*) orbital mixing observed when moving from Group 6 to Group 7 or down transition metal triads.
- M-O e* mixing more than doubled in Rhenium (ReO4-) compared to Chromium (CrO42-).
- Mixing in t2* orbitals (σ* + π*) remained constant within a group but increased from Group 6 to Group 7.
Conclusions:
- Unexpected changes in orbital energy and composition in isoelectronic tetraoxometalates correlate with periodic trends.
- Findings advance the understanding of M-O bonding and its influence on metal oxo properties.
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