Oligothiophenes nano-organized on a cyclotetrasiloxane scaffold as a model of a silica-bound monolayer: evidence for intramolecular excimer formation.
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.
Mróz
Wojciech
W
Istituto per lo Studio delle Macromolecole, CNR, Via Bassini 15, 20133 Milano, Italy.
Bombenger
Jean Philippe
JP
Botta
Chiara
C
Orbelli Biroli
Alessio
A
Pizzotti
Maddalena
M
De Angelis
Filippo
F
Belpassi
Leonardo
L
Tubino
Riccardo
R
Meinardi
Francesco
F