The tetrahedral, shape-persistent molecule 14+, containing four pyridylpyridinium units connected through a central carbon atom, exhibits unexpected photophysical properties including a substantially redshifted absorption (2350 cm−1) and a very strong fluorescence (Φem=40 %), compared with the monomer 2+ (Φem=0.4 %). Density functional theory calculations on the structure and spectroscopic properties of 14+ and 2+ show that exciton interactions, homoconjugation, and orbital nature account for the observed differences in their photophysical properties. The protonated tetramer binds four cucurbit[7]uril molecules and the host/guest interactions can be controlled by chemical (acid/base) as well as redox stimuli.

A Highly Luminescent Tetramer from a Weakly Emitting Monomer: Acid- and Redox-Controlled Multiple Complexation by Cucurbit[7]uril

BERGAMINI, GIACOMO;FERMI, ANDREA;MARCHINI, MARIANNA;LOCRITANI, MIRKO;CREDI, ALBERTO;VENTURI, MARGHERITA;NEGRI, FABRIZIA;CERONI, PAOLA;BARONCINI, MASSIMO
2014

Abstract

The tetrahedral, shape-persistent molecule 14+, containing four pyridylpyridinium units connected through a central carbon atom, exhibits unexpected photophysical properties including a substantially redshifted absorption (2350 cm−1) and a very strong fluorescence (Φem=40 %), compared with the monomer 2+ (Φem=0.4 %). Density functional theory calculations on the structure and spectroscopic properties of 14+ and 2+ show that exciton interactions, homoconjugation, and orbital nature account for the observed differences in their photophysical properties. The protonated tetramer binds four cucurbit[7]uril molecules and the host/guest interactions can be controlled by chemical (acid/base) as well as redox stimuli.
Giacomo Bergamini; Andrea Fermi; Marianna Marchini; Mirko Locritani; Alberto Credi; Margherita Venturi; Fabrizia Negri; Paola Ceroni; Massimo Baroncini
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/342533
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