Interesting ChemistryHelical Metal WireHelical SystemsChemical Sciences

Anapolar ring currents: a [144]-Annulene.

https://doi.org/10.59350/c10zp-5c809
Published in Henry Rzepa's Blog

This is a recently published[cite]10.5560/ZNB.2012-0189[/cite] (hypothetical) molecule which has such unusual properties that I cannot resist sharing it with you. It is an annulene with 144 all-cis CH groups, being a (very) much larger cousin of (also hypothetical) systems mooted in 2009[cite]10.1021/ja710438j[/cite],[cite]10.1021/jp902176a[/cite]. A 144-carbon annulene.

References

General Chemistry

Prediction of a Cyclic Helical Oligoacetylene Showing Anapolar Ring Currents in the Magnetic Field

https://doi.org/10.5560/znb.2012-0189
Published in Zeitschrift für Naturforschung B
Author Raphael J. F. Berger

The first representative of a possible new class of conjugated cyclic polyacetylenes is predicted using DFT calculations. These species have a helical secondary structure and a closed-shell electronic ground-state configuration. Molecular and spectroscopic properties are discussed, and a distinct anapolar ring current structure in a constant and homogeneous magnetic field, perpendicular to the main molecular plane is demonstrated.