Strong Emission Enhancement in pH-Responsive 2:2 Cucurbit[8]uril Complexes.
cucurbiturils
fluorescence enhancement
host-guest systems
intramolecular motion
luminescence
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
01 Mar 2019
01 Mar 2019
Historique:
received:
21
12
2018
pubmed:
13
1
2019
medline:
13
1
2019
entrez:
13
1
2019
Statut:
ppublish
Résumé
Organic fluorophores, particularly stimuli-responsive molecules, are very interesting for biological and material sciences applications, but frequently limited by aggregation- and rotation-caused photoluminescence quenching. A series of easily accessible bipyridinium fluorophores, whose emission is quenched by a twisted intramolecular charge-transfer (TICT) mechanism, is reported. Encapsulation in a cucurbit[7]uril host gave a 1:1 complex exhibiting a moderate emission increase due to destabilization of the TICT state inside the apolar cucurbituril cavity. A much stronger fluorescence enhancement is observed in 2:2 complexes with the larger cucurbit[8]uril, which is caused by additional conformational restriction of rotations around the aryl/aryl bonds. Because the cucurbituril complexes are pH switchable, this system represents an efficient supramolecular ON/OFF fluorescence switch.
Identifiants
pubmed: 30636021
doi: 10.1002/chem.201806337
doi:
Types de publication
Journal Article
Langues
eng
Pagination
3257-3261Subventions
Organisme : Deutsche Forschungsgemeinschaft
ID : CRC 765
Organisme : Deutscher Akademischer Austauschdienst
ID : PPP Finnland
Organisme : Academy of Finland
ID : 298817
Informations de copyright
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.