A triskelion-shaped saddle-helix hybrid nanographene
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AuthorCruz, Carlos M.; Márquez, Irene R.; Castro-Fernández, Silvia; Cuerva, Juan M.; Macoas, Ermelinda; Campaña, Araceli G.
nanographeneshelicenescircularly polarized luminescencenonlinear optics
Cruz Carlos M. [et al.]. A triskelion-shaped saddle-helix hybrid nanographene. Angew. Chem. Int. Ed., 2019
SponsorshipWe acknowledge the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (ERC-2015-STG-677023) and the Ministerio de Economía y Competitividad (MINECO, Spain) (CTQ2015-70283- P, UNGR15-CE-3478, BES-2016-076371 and RyC-2013-12943). E.M. thanks the Fundação para a Ciência e a tecnologia (PTDC/NAN-MAT729317/2017 and PTDC/QUI-QFI/29319/2017). We thank the CSIRC-Alhambra from the University of Granada.
A unique rippled nanographene constituted by 52 fused rings is presented in which six out-of-plane motifs are fully fused into a triangular aromatic surface of ca. 2.5 nm size. Three units of an unprecedented fully lateral π-extended octabenzohelicene together with three units of saddle-shaped heptagonal rings are combined in a single structure leading to a well-soluble warped nanographene. The two pairs of possible enantiomers have been isolated and their linear, non-linear and chiroptical properties evaluated, revealing an outstanding quantum yield and brightness values at low energy together with good chiroptical responses both in the absorption and emission