Undecabenzo[7]superhelicene: a helical nanographene ribbon as CPL emitter
Metadata
Show full item recordAuthor
Moreno Cruz, Carlos; Castro-Fernández, Silvia; Macoas, Ermelinda; Cuerva Carvajal, Juan Manuel; González Campaña, AraceliEditorial
Wiley-VCH
Materia
Nanographenes Helicenes Circularly polarized luminescence Nanostructures Nonlinear optics
Date
2018-08Referencia bibliográfica
Cruz, Carlos M. et. al. Undecabenzo[7]superhelicene: a helical nanographene ribbon as CPL emitter. Angew. Chem. Int. Ed., 2018, DOI: 10.1002/anie.201808178 [http://hdl.handle.net/10481/52640]
Sponsorship
-European Research Council (ERC-2015-STG-677023) -Ministerio de Economía y Competitividad (MINECO, Spain): CTQ2015-70283-P -Fundacao para a Ciencia e a tecnologia, Portugal: UID/NAN/50024/2013, IF/00759/2013 -Universidad de GranadaAbstract
We report the synthesis and characterization of an
enantiopure superhelicene nanographene constituted by two saddleshaped
and one planar hexabenzocoronene (HBC) units arranged in
a helicoidal shape. This is, to the best of our knowledge, the first
undecabenzo[7]carbohelicene, i.e., the first fully π-extended
[7]helicene. Racemic resolution allowed its chiroptical properties
analysis revealing dissymmetry factors in the range of 2×10-3 both in
the absorption and in the emission measurements. Remarkably, nonlinear
photophysical analysis showed two-photon absorption crosssection
of 870 GM at 800 nm and a perfect overlapping between linear,
non-linear and chiral emission.