Controllable Charge-Transfer Mechanism at Push–Pull Porphyrin/Nanocarbon Interfaces
Senge, Mathias O.
Blau, Werner J.
Mohammed, Omar F.
KAUST DepartmentChemical Science
Chemical Science Program
KAUST Solar Center
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Physical Sciences and Engineering
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2019-05-22
Print Publication Date2019-06-13
Embargo End Date2020-05-22
Permanent link to this recordhttp://hdl.handle.net/10754/655991
MetadataShow full item record
AbstractPush–pull porphyrins are made of an electron donor (D), an electron acceptor (A), and a conjugated bridge connecting the D and A units. The tunability of their highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) gap can modulate their inter- and intramolecular charge-transfer (CT) and charge-separation (CS) characteristics and their reaction mechanism. Here, ultrafast charge transfer at the interfaces between 5,15-donor–acceptor push–pull porphyrins (Por-tBu and Por-OC8) and nanocarbon materials in the form of fullerene (C60) and graphene carboxylate (GC) are investigated using steady-state and pump–probe spectroscopic techniques. The strong photoluminescence (PL) quenching of the porphyrin indicates an electron transfer from the photoexcited porphyrin to the nanocarbon materials. The results of steady-state and time-resolved experiments reveal that a static and both static and dynamic electron transfer are dominant in the presence of GC and C60, respectively. This work provides new physical insights into the electron-transfer process and its driving force in donor–acceptor systems that include nanocarbon materials.
CitationArpaçay, P., Maity, P., El-Zohry, A. M., Meindl, A., Akca, S., Plunkett, S., … Mohammed, O. F. (2019). Controllable Charge-Transfer Mechanism at Push–Pull Porphyrin/Nanocarbon Interfaces. The Journal of Physical Chemistry C, 123(23), 14283–14291. doi:10.1021/acs.jpcc.9b03718
SponsorsThe authors are grateful for the financial support from Science Foundation Ireland (SFI, (W.J.B. 12/IA/1306) and (M.O.S. IvP 13/IA/1894)) and King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)