Related Experiment Video
Updated: Mar 27, 2026

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
Published on: September 18, 2016
[32]π Fused Core-Modified Heptaphyrin with Möbius Aromaticity
Arindam Ghosh1, Arvind Chaudhary1, A Srinivasan1
1School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, 751005, Odisha, India.
Abstract:
A new fused core-modified 32π heptaphyrin with Möbius aromatic character is reported. The (1)H NMR data indicated a weak Möbius aromaticity at 298 K; however, at 213-183 K, the molecule predominates [4n]π Möbius conformation with strong diatropic ring current, which was further confirmed by X-ray analysis. The protonation experiment led to preservation of the Möbius aromaticity at 298 K. Nevertheless, the experimental results were further supported by theoretical studies. Overall, this study represents the first example of Möbius aromatic fused core-modified expanded porphyrin.
Related Concept Videos
Five-Membered Heterocyclic Aromatic Compounds: Overview
Aromatic Hydrocarbon Cations: Structural Overview
Removing one hydrogen from the intervening CH2 group...
Frost Circles for Different Conjugated Systems
Aromatic Hydrocarbon Anions: Structural Overview
Due to the absence of continuous...
Criteria for Aromaticity and the Hückel 4n + 2 Rule
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
Aromatic Compounds: Overview
In 1825, Faraday isolated...

