ALVARO-MARTINS, Maria Joao; GARCES-GARCES, Jose; SCALABRE, Antoine; LIU, Peizhao; FERNANDEZ-LAZARO, Fernando; SASTRE-SANTOS, Angela; BASSANI, Dario M.; ODA, Reiko

doi:10.1002/cphc.202200573

Chimie et Biologie des Membranes et des Nanoobjets [CBMN]

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Article de revue

Ce document a été publié dans

Chemphyschem. 2023-02-01, vol. 24, n° 3

Résumé en anglais

The synthesis and characterization of diketopyrrolopyrroles and perylenemonoimidodiesters linked to a substituted benzoic acid in the ortho, meta, and para positions, are reported. Grafting of these dyes on the surface of chiral silica nanohelices is used to probe how the morphology of the platform at the mesoscopic level affects the induction of chiroptical properties onto achiral molecular chromophores. The grafted structures are weakly (diketopyrrolopyrroles) or strongly (perylenemonoimidodiesters) emissive, exhibiting both locally-excited state emission and a broad, structureless emission assigned to excimers. The dissymmetry factors obtained using circular dichroism highlight optimized supramolecular organization between the chromophores for enhancing the chiroptical properties of the system. In the ortho- derivatives, poor organization due to steric hindrance is reflected in a low density of chromophores on walls of the silica-nanostructures (<0.1 vs. >0.3 and up to 0.6 molecules/nm2 for the ortho and meta or para derivatives, respectively) and lower gabs values than in the other derivatives (gabs<2×10−5 vs 6×10−5 for the ortho and para derivatives, respectively). The para derivatives presented a better organization and increased values of gabs. All grafted chromophores evidence varying degrees of excimer emission which was not found to directly correlate to their grafting density.< Réduire

Mots clés en anglais

Chirality

Diketopyrrolopyrrole

Fluorescence

Perylenemonoimidodiesters

Silica nanosystems

URI

https://oskar-bordeaux.fr/handle/20.500.12278/199191

DOI

http://dx.doi.org/10.1002/cphc.202200573

Project ANR

Induction Chirale de la Microstructure vers l'Electron pour une Emission Radiative Anisotrope - ANR-21-CE09-0012

Unités de recherche

CBMN : Chimie & de Biologie des Membranes & des Nano-objets - UMR 5248

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Disentangling Excimer Emission from Chiral Induction in Nanoscale Helical Silica Scaffolds Bearing Achiral Chromophores