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Oligothiophenes Nano‐organized on a Cyclotetrasiloxane Scaffold as a Model of a Silica‐Bound Monolayer: Evidence for Intramolecular Excimer Formation
Author(s) -
Mróz Wojciech,
Bombenger Jean Philippe,
Botta Chiara,
Orbelli Biroli Alessio,
Pizzotti Maddalena,
De Angelis Filippo,
Belpassi Leonardo,
Tubino Riccardo,
Meinardi Francesco
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200901307
Subject(s) - excimer , intramolecular force , terthiophene , excited state , covalent bond , fluorescence , photochemistry , materials science , nanotechnology , molecule , nano , chemistry , optics , stereochemistry , physics , composite material , organic chemistry , atomic physics
Excimer formation in a new class of terthiophene‐based fluorophores covalently bonded to a cyclotetrasiloxane scaffold has been demonstrated and the photophysical process ruling it has been investigated in detail and modeled theoretically. In contrast to the conventional systems in which long‐living fluorophores such as pyrene are linked in the same molecule, an excimer is formed only when two terthiophene‐based branches nano‐organized on the same cyclotetrasiloxane scaffold are close enough together when excitation takes place. In such a case, excimer formation is extremely efficient, and the new bound excited states are quite stable.