Related Experiment Video
Updated: Jul 28, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
Published on: September 17, 2017
Why downfield proton chemical shifts are not reliable aromaticity indicators
F Faglioni1, A Ligabue, S Pelloni
1Dipartimento di Chimica, Università degli Studi di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy.
Abstract:
Traces of magnetizability, traces of magnetic shielding at the hydrogen nuclei, and nucleus-independent chemical shift are not reliable aromaticity quantifiers for planar conjugated hydrocarbons. A measure of aromaticity is provided by the out-of-plane tensor components, whose magnitude is influenced by the pi-ring currents. The failure of nucleus-independent chemical shift in this regard was proved for the molecule shown in the abstract graphic, sustaining a diatropic pi-current. The validity of the ring-current model is reaffirmed. [structure: see text]
More Related Videos
Related Concept Videos
Proton (¹H) NMR: Chemical Shift
Absorption signals of all the protium nuclei in a...
Inductive Effects on Chemical Shift: Overview
NMR Spectroscopy of Aromatic Compounds
NMR Spectroscopy of Benzene Derivatives
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
NMR Spectroscopy Of Amines

