- Photoinduced electron and energy transfer processes in a bichromophoric pyrene-perylene bisimide system
- Journal of Physical Chemistry
- Volume | Issue number
- 108 | 11
- Pages (from-to)
- Number of pages
- Document type
- Faculty of Science (FNWI)
- Van 't Hoff Institute for Molecular Sciences (HIMS)
The synthesis and photophysical properties of a system consisting of a bay-functionalized perylene bisimide, containing four appended pyrene and two coordinating pyridine units, and its reference system are described. A complete study of their photophysical properties was obtained using UV-vis absorption, steady state and time-resolved emission, and femtosecond transient absorption. Analysis of the data, obtained from time-resolved emission and femtosecond transient absorption spectroscopy, showed the presence of both photoinduced electron and energy transfer processes. A high yield (>90%) and fast photoinduced energy transfer (k(en) approximate to 6.2 x 10(9) s(-1)) is followed by efficient electron transfer (70%, k(et) approximate to 6.6 x 10(9) s(-1)) from the pyrene units to the perylene bisimide moiety. The energy donor-acceptor distance, R = 8.6 Angstrom, is calculated from the experimental energy transfer rate using Forster theory. Temperature-dependent time-resolved emission spectroscopy showed an increase of the acceptor emission lifetime with decreasing temperature. It also indicates the presence of different conformations because two different electron transfer barriers (0.08 and 0.42 eV) were found. These barrier values were corroborated by a theoretical analysis of the energetics of the process using Marcus theory, indicating average donor-acceptor distances of 4.5 Angstrom (room temperature) to 11 Angstrom (at low 7).
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.