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Oligothiophenes Nano‐organized on a Cyclotetrasiloxane Scaffold as a Model of a Silica‐Bound Monolayer: Evidence for Intramolecular Excimer Formation |
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| Authors: | Wojciech Mróz Jean Philippe Bombenger Dr. Chiara Botta Dr. Alessio Orbelli Biroli Dr. Maddalena Pizzotti Prof. Filippo De Angelis Dr. Leonardo Belpassi Riccardo Tubino Prof. Francesco Meinardi Prof. |
| Affiliation: | 1. Istituto per lo Studio delle Macromolecole, CNR, Via Bassini 15, 20133 Milano (Italy);2. Dipartimento di Chimica Inorganica, Metallorganica e Analitica “Lamberto Malatesta”, Unità di Ricerca dell'INSTM, Università degli Studi di Milano, Via G. Venezian 21, 20133 Milano (Italy);3. Istituto di Scienze e Tecnologie Molecolari del CNR (ISTM‐CNR) c/o Diparimento di Chimica, Università degli Studi di Perugia, Via Elce di Sotto 8, 06123 Perugia (Italy);4. CNR/INFM and Dipartimento di Scienza dei Materiali, Università di Milano‐Bicocca, Via Cozzi 53, 20125 Milano (Italy), Fax: (+39)?02‐6448‐5400 |
| Abstract: | 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. |
| Keywords: | excimers luminescence nanostructures siloxanes thiophenes |