Photoinduced electron transfer in isolated bichromophoric and solvated trichromophoric systems

✍ Scribed by J.W. Verhoeven; B. Wegewijs; R.M. Hermant; R.J. Willemse; A.M. Brouwer

• Book ID: 103992773
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 653 KB
• Volume: 95
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(95)04236-9

✦ Synopsis

Atler local photoexci|ation of the accepter chmmophore, fast and virtually barrierless charge separation over approximately 5 A is observed under supersonic jet isolated conditions in three rigid donor-bridge-accepter (D-br-A) systems in which D and A are separated by three o' bonds. It is suggested that low frequency tntramolecular vibrational modes, discernible in the well-resolved excitation spectra, play a role in enabling efficient internal conversion between the locally excited and charge transfer states.

Insertion of an extra piperidine unit in the bridge elongates its overall length to seven o" bonds, while at the same time a tertiary nitrogen is added as an intermediate donor site. In the resulting trichromophoric systems (D2-br-Dt-br-A). stepwise charge separation occur= in salution with a strong solvent dependence.