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Updated: Feb 7, 2026

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Nuclearity effects in supported, single-site Fe(ii) hydrogenation pre-catalysts
Ryan R Langeslay1, Hyuntae Sohn, Bo Hu
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA. langesrr@anl.gov asattelberger@anl.gov delferro@anl.gov.
Abstract:
Dimeric and monomeric supported single-site Fe(ii) pre-catalysts on SiO2 have been prepared via organometallic grafting and characterized with advanced spectroscopic techniques. Manipulation of the surface hydroxyl concentration on the support influences monomer/dimer formation. While both pre-catalysts are highly active in liquid-phase hydrogenation, the dimeric pre-catalyst is ∼3× faster than the monomer. Preliminary XAS experiments on the H2-activated samples suggest the active species are isolated Fe(ii) sites.
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