Real-time observation of intersystem crossing induced by charge recombination during bimolecular electron transfer reactions

Amani A. Alsam, Shawkat Mohammede Aly, Manas R. Parida, Erkki Alarousu, Zhen Cao, Luigi Cavallo, Omar F. Mohammed

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Real-time probing of intersystem crossing (ISC) and triplet-state formation after photoinduced electron transfer (ET) is a particularly challenging task that can be achieved by time-resolved spectroscopy with broadband capability. Here, we examine the mechanism of charge separation (CS), charge recombination (CR) and ISC of bimolecular photoinduced electron transfer (PET) between poly[(9,9-di(3,3′-N,N’-trimethyl-ammonium) propyl fluorenyl-2,7-diyl)-alt-co-(9,9-dioctyl-fluorenyl-2,7-diyl)] diiodide salt (PFN) and dicyanobenzene (DCB) using time-resolved spectroscopy. PET from PFN to DCB is confirmed by monitoring the transient absorption (TA) and infrared spectroscopic signatures for the radical ion pair (DCB─•-PFN+•). In addition, our time-resolved results clearly demonstrate that CS takes place within picoseconds followed by CR within nanoseconds. The ns-TA data exhibit the clear spectroscopic signature of PFN triplet-triplet absorption, induced by the CR of the radical ion pairs (DCB─•-PFN+•). As a result, the triplet state of PFN (3PFN*) forms and subsequently, the ground singlet state is replenished within microseconds. © 2016
Original languageEnglish (US)
Pages (from-to)881-886
Number of pages6
JournalDyes and Pigments
Volume136
DOIs
StatePublished - Sep 21 2016

Fingerprint Dive into the research topics of 'Real-time observation of intersystem crossing induced by charge recombination during bimolecular electron transfer reactions'. Together they form a unique fingerprint.

Cite this