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Updated: Jul 2, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
Linking number analysis of a pentadecanuclear metallamacrocycle: a Möbius-Craig system revealed
1Department of Chemistry, Imperial College London, Exhibition Road Campus, London, SW7 2AY. rzepa@ic.ac.uk
Abstract:
An analysis of the pi-electronic topology of a recently reported pentadecanuclear manganese metallacycle in terms of linking number, twist, and writhe confirms its previous assignment as a Möbius system of order six. The total degree of local torsion is reduced by a significant contribution from writhe, thus correcting the previously inferred local torsion at each metal center from 120 degrees to approximately 90 degrees . This latter value suggests a model for the cyclic pi conjugation around the metallacycle, which involves 3d pi-2p pi interactions at the metal center, of a type first suggested by Craig 50 years ago in the context of main group cyclic aromatic systems.
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