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- Aromatic_ring_current abstract "An aromatic ring current is an effect observed in aromatic molecules such as benzene and naphthalene. If a magnetic field is directed perpendicular to the plane of the aromatic system, a ring current is induced in the delocalized π electrons of the aromatic ring. This is a direct consequence of Ampère's law; since the electrons involved are free to circulate, rather than being localized in bonds as they would be in most non-aromatic molecules, they respond much more strongly to the magnetic field.Aromatic ring currents are relevant to NMR spectroscopy, as they dramatically influence the chemical shifts of 1H nuclei in aromatic molecules,. The effect helps distinguish these nuclear environments and is therefore of great use in molecular structure determination. In benzene, the ring protons experience deshielding because the induced magnetic field has the same direction as the external field and their chemical shift is 7.3 ppm compared to 5.6 to the vinylic proton in cyclohexene. In contrast any proton inside the aromatic ring experiences shielding because both fields are in opposite direction. This effect can be observed in cyclooctadecanonaene ([18]annulene) with 6 inner protons at −3 ppm.The situation is reversed in antiaromatic compounds. In the dianion of [18]annulene the inner protons are strongly deshielded at 20.8 ppm and 29.5 ppm with the outer protons significantly shielded (with respect to the reference) at −1.1 ppm. Hence a diamagnetic ring current or diatropic ring current is associated with aromaticity whereas a paratropic ring current signals antiaromaticity.A similar effect is observed in three-dimensional fullerenes; in this case it is called a sphere current.".
- Aromatic_ring_current thumbnail Aromatic-ring-current.png?width=300.
- Aromatic_ring_current wikiPageID "4401137".
- Aromatic_ring_current wikiPageLength "7680".
- Aromatic_ring_current wikiPageOutDegree "54".
- Aromatic_ring_current wikiPageRevisionID "676628985".
- Aromatic_ring_current wikiPageWikiLink Ampxc3xa8res_circuital_law.
- Aromatic_ring_current wikiPageWikiLink Antiaromaticity.
- Aromatic_ring_current wikiPageWikiLink Aromaticity.
- Aromatic_ring_current wikiPageWikiLink Atomic_nucleus.
- Aromatic_ring_current wikiPageWikiLink Benzene.
- Aromatic_ring_current wikiPageWikiLink Bond_length.
- Aromatic_ring_current wikiPageWikiLink Borazine.
- Aromatic_ring_current wikiPageWikiLink Category:Electric_current.
- Aromatic_ring_current wikiPageWikiLink Category:Nuclear_magnetic_resonance.
- Aromatic_ring_current wikiPageWikiLink Chemical_shift.
- Aromatic_ring_current wikiPageWikiLink Computational_chemistry.
- Aromatic_ring_current wikiPageWikiLink Coordination_complex.
- Aromatic_ring_current wikiPageWikiLink Cyclobutadiene.
- Aromatic_ring_current wikiPageWikiLink Cyclohexane.
- Aromatic_ring_current wikiPageWikiLink Cyclohexene.
- Aromatic_ring_current wikiPageWikiLink Cyclooctadecanonaene.
- Aromatic_ring_current wikiPageWikiLink Cyclopentadiene.
- Aromatic_ring_current wikiPageWikiLink Cyclopentadienyl.
- Aromatic_ring_current wikiPageWikiLink Electromagnetic_shielding.
- Aromatic_ring_current wikiPageWikiLink Fullerene.
- Aromatic_ring_current wikiPageWikiLink Furan.
- Aromatic_ring_current wikiPageWikiLink Hapticity.
- Aromatic_ring_current wikiPageWikiLink Heptalene.
- Aromatic_ring_current wikiPageWikiLink Hydrogen_atom.
- Aromatic_ring_current wikiPageWikiLink Ion.
- Aromatic_ring_current wikiPageWikiLink Lambda.
- Aromatic_ring_current wikiPageWikiLink Lithium.
- Aromatic_ring_current wikiPageWikiLink Magnetic_field.
- Aromatic_ring_current wikiPageWikiLink Magnetic_susceptibility.
- Aromatic_ring_current wikiPageWikiLink Molecule.
- Aromatic_ring_current wikiPageWikiLink Naphthalene.
- Aromatic_ring_current wikiPageWikiLink Normalization_(statistics).
- Aromatic_ring_current wikiPageWikiLink Nuclear_magnetic_resonance_spectroscopy.
- Aromatic_ring_current wikiPageWikiLink Pentalene.
- Aromatic_ring_current wikiPageWikiLink Perpendicular.
- Aromatic_ring_current wikiPageWikiLink Pi_bond.
- Aromatic_ring_current wikiPageWikiLink Pyrrole.
- Aromatic_ring_current wikiPageWikiLink Squared_deviations_from_the_mean.
- Aromatic_ring_current wikiPageWikiLink Thiophene.
- Aromatic_ring_current wikiPageWikiLink Tropylium_cation.
- Aromatic_ring_current wikiPageWikiLink Vinyl.
- Aromatic_ring_current wikiPageWikiLink Ångström.
- Aromatic_ring_current wikiPageWikiLink File:Aromatic-ring-current.png.
- Aromatic_ring_current wikiPageWikiLink File:Benzene_ring_currents.png.
- Aromatic_ring_current wikiPageWikiLinkText "Aromatic ring current".
- Aromatic_ring_current wikiPageWikiLinkText "aromatic ring current".
- Aromatic_ring_current wikiPageWikiLinkText "diamagnetic ring current present in aromatic compounds".
- Aromatic_ring_current wikiPageWikiLinkText "ring currents".
- Aromatic_ring_current wikiPageUsesTemplate Template:About.
- Aromatic_ring_current wikiPageUsesTemplate Template:Reflist.
- Aromatic_ring_current subject Category:Electric_current.
- Aromatic_ring_current subject Category:Nuclear_magnetic_resonance.
- Aromatic_ring_current hypernym Effect.
- Aromatic_ring_current type Disease.
- Aromatic_ring_current type Biophysic.
- Aromatic_ring_current type Physic.
- Aromatic_ring_current comment "An aromatic ring current is an effect observed in aromatic molecules such as benzene and naphthalene. If a magnetic field is directed perpendicular to the plane of the aromatic system, a ring current is induced in the delocalized π electrons of the aromatic ring.".
- Aromatic_ring_current label "Aromatic ring current".
- Aromatic_ring_current sameAs Q4795520.
- Aromatic_ring_current sameAs 環電流.
- Aromatic_ring_current sameAs Corrente_de_anel_aromático.
- Aromatic_ring_current sameAs m.0c07cj.
- Aromatic_ring_current sameAs Q4795520.
- Aromatic_ring_current wasDerivedFrom Aromatic_ring_current?oldid=676628985.
- Aromatic_ring_current depiction Aromatic-ring-current.png.
- Aromatic_ring_current isPrimaryTopicOf Aromatic_ring_current.