Abstract
AbstractThe formation of supramolecular complexes between C60 and a molecular nanographene endowed with both positive and negative curvatures is described. The presence of a corannulene moiety and the saddle shape of the molecular nanographene allows the formation of complexes with 1:1, 1:2, and 2:1 stoichiometries. The association constants for the three possible supramolecular complexes were determined by 1H NMR titration. Furthermore, the stability of the three complexes was calculated by theoretical methods that also predict the photoinduced electron transfer from the curved nanographene to the electron acceptor C60. Time‐resolved transient absorption measurements on the ns‐time scale showed that the addition of C60 to NG‐1 solutions and photo‐exciting them at 460 nm leads to the solvent‐dependent formation of new species, in particular the formation of the one‐electron reduced form of C60 in benzonitrile was observed.
Highlights
Graphene quantum dots are electron confined flakes of graphene with dimensions usually in the 3–20 nm range
The aim of this work is focused on the supramolecular complexation of NG-1 with C60 by taking advantage of their respective concave and convex geometries.[17]
Experimental corroboration for the complexation of, for example, curved NG-1 and C60 was performed by 1H-NMR titration
Summary
Graphene quantum dots are electron confined flakes of graphene with dimensions usually in the 3–20 nm range They are considered as a singular family of zero dimensional (0D) carbon-based materials, since, in contrast to pristine graphene, these nanomaterials are luminescent with a non-zero band gap stemming from quantum confinement and edge effects.[1]. By virtue of such unique electronic features, they render outstanding materials for optoelectronic devices,[2] energy storage systems,[3] perovskite solar cells,[4] and biomedical applications.[5]. Bottom-up approaches have enabled solution-phase syntheses of these materials in a step-by-step fashion. This has resulted in an accurate control over size, morphology and, on-demand fine-tuning of the properties.[6]. Molecular nanographenes with a wide range of shapes, namely bilayers,[7] belts,[8] ribbons,[9] propellers,[10] helical,[11] planar[12] and curved,[13] have been prepared by using controlled bottom-up approaches (Figure 1)
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