Pyrene‐Based Dyad and Triad Leading to a Reversible Chemical and Redox Optical and Magnetic Switch |
| |
| Authors: | Carlos Franco Dr. Marta Mas‐Torrent Dr. Antonio Caballero Dr. Arturo Espinosa Prof. Pedro Molina Prof. Jaume Veciana Prof. Concepció Rovira |
| |
| Affiliation: | 1. Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC), Campus UAB, 08193 Bellaterra (Spain);2. Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN), 08193 Bellaterra (Spain);3. Departmento de Quimica Orgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30100 Murcia (Spain) |
| |
| Abstract: | Two new pyrene–polychlorotriphenylmethyl (PTM) dyads and triads have been synthesized and characterized by optical, magnetic, and electrochemical methods. The interplay between the different electronic states of the PTM moiety in the dyads and triads and the optical and magnetic properties of the molecules have been studied. The electronic spectra of the radicals 5 . and 6 . show the intramolecular charge‐transfer transition at around 700 nm due to the acceptor character of the PTM radical. In the diamagnetic protonated derivatives 3 and 4 the fluorescence due to the pyrene is maintained, whereas in the radicals 5 . and 6 . and the corresponding anions 5 ? and 6 ? there is a clear quenching of the fluorescence, which is more efficient in the case of radicals. The redox activity of PTM radicals that are easily reduced to the corresponding carbanion has been exploited to fabricate electrochemical switches with optical and magnetic response. |
| |
| Keywords: | donor– acceptor systems electronic states molecular devices radicals redox chemistry |
|
|
