4.6 Article

On the Reactivity Enhancement of Graphene by Metallic Substrates towards Aryl Nitrene Cycloadditions

Journal

CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 29, Pages 7887-7896

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202100227

Keywords

DFT; graphene; nitrenes; Ni; perfluoroaryl azides

Funding

  1. National Science Foundation [CHE-1808671]
  2. NSF [CBET-2028826]

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Metal substrates can significantly enhance the reactivity of pristine graphene towards perfluorophenyl azide. Density functional theory calculations suggest that the metal substrate stabilizes the physisorbed nitrene through enhanced electron transfer.
Pristine graphene is fairly inert chemically, and as such, most application-driven studies use graphene oxide, or reduced graphene oxide. Using substrates to modulate the reactivity of graphene represents a unique strategy in the covalent functionalization of this otherwise fairly inert material. It was found that the reactivity of pristine graphene towards perfluorophenyl azide (PFPA) can be enhanced by a metal substrate on which graphene is supported. Results on the extent of functionalization, defect density, and reaction kinetics all show that graphene supported on Ni (G/Ni) has the highest reactivity toward PFPA, followed by G/Cu and then G/silicon wafer. DFT calculations suggest that the metal substrate stabilizes the physisorbed nitrene through enhanced electron transfer to the singlet nitrene from the graphene surface assisted by the electron rich metal substrate. The G/Ni substantially stabilizes the singlet nitrene relative to G/Cu and the free-standing graphene. The product structure is also predicted to be substrate dependent. These findings open up opportunities to enhance the reactivity of pristine graphene simply through the selection of the substrate. This also represents a new and powerful approach to increasing the reactivity of singlet nitrenes through direct electronic communication with graphene.

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