Controllable Charge-Transfer Mechanism at Push–Pull Porphyrin/Nanocarbon Interfaces

Pınar Arpaçay, Partha Maity, Ahmed El-Zohry, Alina Meindl, Sevilay Akca, Shane Plunkett, Mathias O. Senge, Werner J. Blau, Omar F. Mohammed

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Push–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.
Original languageEnglish (US)
Pages (from-to)14283-14291
Number of pages9
JournalThe Journal of Physical Chemistry C
Volume123
Issue number23
DOIs
StatePublished - May 22 2019

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