Issue 5, 2018

Synthesis and properties of [7]helicene and [7]helicene-like compounds with a cyclopenta[1,2-b:4,3-b′]dithiophene or dithieno[2,3-b:3′,2′-d]heterole skeleton

Abstract

A series of [7]helicene and [7]helicene-like compounds composed of a cyclopenta[1,2-b:4,3-b′]dithiophene or dithieno[2,3-b:3′,2′-d]heterole moiety and two naphthalene moieties were successfully synthesized from a common synthetic intermediate, 1,1′-binaphtho[2,1-b]thiophene. Their helical structures were confirmed by X-ray crystallographic analysis. The photophysical properties of them and their benzene analogues were investigated via absorption and fluorescence spectroscopy and theoretical calculations to correlate the effect of the five-membered rings in their π-conjugated skeleton. Through these investigations, the photophysical properties were found to largely depend on a combination of the central five-membered ring and the neighboring two aromatic rings. In particular, a combination of the central five-membered ring with electron-withdrawing character and the two neighboring thiophene rings was revealed to induce red-shifted emission.

Graphical abstract: Synthesis and properties of [7]helicene and [7]helicene-like compounds with a cyclopenta[1,2-b:4,3-b′]dithiophene or dithieno[2,3-b:3′,2′-d]heterole skeleton

Supplementary files

Article information

Article type
Paper
Submitted
15 sept. 2017
Accepted
07 nov. 2017
First published
16 nov. 2017

Phys. Chem. Chem. Phys., 2018,20, 3286-3295

Synthesis and properties of [7]helicene and [7]helicene-like compounds with a cyclopenta[1,2-b:4,3-b′]dithiophene or dithieno[2,3-b:3′,2′-d]heterole skeleton

K. Uematsu, K. Noguchi and K. Nakano, Phys. Chem. Chem. Phys., 2018, 20, 3286 DOI: 10.1039/C7CP06342C

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