Real-time observation of intersystem crossing induced by charge recombination during bimolecular electron transfer reactions
Type
ArticleAuthors
Alsam, Amani A.
Aly, Shawkat Mohammede

Parida, Manas R.

Alarousu, Erkki
Cao, Zhen
Cavallo, Luigi

Mohammed, Omar F.

KAUST Department
Chemical Science ProgramKAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Date
2016-09-21Online Publication Date
2016-09-21Print Publication Date
2017-01Permanent link to this record
http://hdl.handle.net/10754/622240
Metadata
Show full item recordAbstract
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. © 2016Citation
Alsam AA, Aly SM, Parida MR, Alarousu E, Cao Z, et al. (2017) Real-time observation of intersystem crossing induced by charge recombination during bimolecular electron transfer reactions. Dyes and Pigments 136: 881–886. Available: http://dx.doi.org/10.1016/j.dyepig.2016.09.049.Sponsors
This work was supported by King Abdullah University of Science and Technology (KAUST). This work is also supported by Saudi Arabia Basic Industries Corporation (SABIC) grant RGC/3/2470-01.Publisher
Elsevier BVJournal
Dyes and PigmentsAdditional Links
http://www.sciencedirect.com/science/article/pii/S0143720816307768ae974a485f413a2113503eed53cd6c53
10.1016/j.dyepig.2016.09.049