@misc{10481/78152,
year = {2020},
month = {12},
url = {https://hdl.handle.net/10481/78152},
abstract = {We report a new family of hexa-peri-hexabenzocoronene (HBC)-based helical nanographenes incorporating π-extended carbo[5]helicenes bearing an octagonal carbocycle. This family represents a new kind of highly distorted saddle-helix hybrid nanographenes. For the first time, the eight-membered ring becomes a constituent of both a carbo[5]helicene and a HBC and thus, the negative curvature is responsible for twisting both units. This novel chiral motif, namely, oct-[5]helicene results in the largest torsion angle recorded so far for a carbo[5]helicene (θ=79.5°), as it has been suggested by DFT-calculations and confirmed by X-ray crystallography. Consequently, the barriers of isomerization become exceptionally high for a [5]helicene unsubstituted in the fjord region since neither racemization nor decomposition were observed at 200 °C for 1 or 3 during 5 h. Therefore, racemic resolutions allowed subsequent chiroptical studies showing the ECD and CPL responses of this novel family of chiral nanographenes.},
organization = {the European Research Council (ERC)
under the European UnionQs Horizon 2020 research and
innovation program (ERC-2015-STG-677023),},
organization = {the Ministerio
de Ciencia, Innovaciln y Universidades (MICIU/FEDER/
AEI, Spain, PGC2018-101181-B-I00)},
organization = {Universidad de
Granada (UGR) (Plan Propio—Intensificaciln de la Investigaci
ln PP2017-PRI.I-02)},
keywords = {Chirality},
keywords = {Circularly polarized luminescence},
keywords = {Helicenes},
title = {Octagon-Embedded Carbohelicene as a Chiral Motif for Circularly Polarized Luminescence Emission of Saddle-Helix Nanographenes},
doi = {10.1002/anie.202015368},
author = {Medel Miranda, Miguel Ángel and Tapia Martín, Rubén and Blanco Suárez, Víctor and Miguel Álvarez, Delia and Morcillo Martínez, Sara Patricia and González Campaña, Araceli},
}