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Updated: Sep 29, 2026

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
08:40

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Published on: May 15, 2018

Strong intramolecular chromophore interactions in novel bis([60]fullerene)-oligoporphyrin nanoarrays

Davide Bonifazi1, François Diederich

  • 1Laboratorium für Organische Chemie, ETH-Hönggerberg, CH-8093, Zürich, Switzerland.

Chemical Communications (Cambridge, England)
|October 3, 2002
PubMed

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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.