Type

Journal Article

Authors

Omar F. Mohammed
Sevilay Akca
Shane Plunkett
Alina Meindl
Partha Maity
Pinar Apraçay
Mathias Senge
Werner Blau

Subjects

Chemistry

Topics
ground state energy transfer electron transfer pyrroles ultrafast charge transfer absorption chromatogrpahy quenching charge transfer

Controllable Charge-Transfer Mechanism at Push-Pull Porphyrin/Nanocarbon Interfaces (2019)

Abstract 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 femtosecond (fs) pump-probe spectroscopy with broadband capabilities. The strong photoluminescence (PL) quenching of the porphyrin indicates electron and/or energy transfer from the photoexcited porphyrin to the nanocarbon materials. More interestingly, the Stern-Volmer plots of PL quenching shows linear and nonlinear patterns upon increasing the concentration of GC or C60 in the porphyrin solution, respectively, clearly indicating static and a combination of static and dynamic quenching at the interfaces with these nanocarbon materials. Using femtosecond transient absorption (TA) spectroscopy, ultrafast electron transfer from a singlet-excited porphyrin to the nanocarbon materials is clearly identified by the fast ground state bleach recovery and the formation of cation radical species. Furthermore, a fs-TA study revealed that both porphyrins show very long-lived ground state bleach (GSB) and excited state absorption (ESA), which can be attributed to the triplet-state formation. This work provides new physical insights into the electron transfer process and its driving force in donor-accepter systems that include nanocarbon materials.
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Full list of authors on original publication

Omar F. Mohammed, Sevilay Akca, Shane Plunkett, Alina Meindl, Partha Maity, Pinar Apraçay, Mathias Senge, Werner Blau

Experts in our system

1
Shane Plunkett
Trinity College Dublin
Total Publications: 7
 
2
Alina Meindl
Trinity College Dublin
Total Publications: 4
 
3
Mathias Senge
Trinity College Dublin
Total Publications: 194
 
4
Werner Blau
Trinity College Dublin
Total Publications: 109