5,14-Diaryldiindeno[2,1- f:1',2' -j]picene: A New Stable [7]Helicene with a Partial Biradical Character

J Am Chem Soc. 2018 Oct 31;140(43):14357-14366. doi: 10.1021/jacs.8b08840. Epub 2018 Oct 22.

Abstract

5,14-Diaryldiindeno[2,1- f:1',2' -j]picene (DDP, 1), a thermally and chemically stable helical arene, can be prepared from 1,4-bis[2-(arylethynyl)phenyl]benzene in four synthetic steps. Its helical backbone, which incorporates an o-quinodimethane moiety, was verified by X-ray crystallography, and this structural feature results in a very high barrier to racemization (exceeding 50 kcal/mol). DDP possesses versatile and promising properties, including a small HOMO-LUMO energy gap (1.31 eV for the dimesityl-substituted derivative 1ab), an electron spin resonance (ESR)-active character, a small triplet-singlet energy gap (4.75 kcal/mol), broad photoabsorption covering the ultraviolet, visible, and near-infrared (NIR) regions, two-photon absorption in the NIR range, and respectable ambipolar charge-transport behavior in a solution-processed organic field-effect transistor.

Publication types

  • Research Support, Non-U.S. Gov't