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Numerical analysis of the coupling mechanism in long-range plasmonic couplers at 1.55 μm

Giovanni Magno1, Marco Grande, Vincenzo Petruzzelli

  • 1Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, via Re David 200, Bari 70125, Italy. g.magno@poliba.it

Optics Letters
|January 4, 2013
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.