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

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    Type
    Article
    Authors
    Alsam, Amani A. cc
    Aly, Shawkat Mohammede cc
    Parida, Manas R. cc
    Alarousu, Erkki
    Cao, Zhen
    Cavallo, Luigi cc
    Mohammed, Omar F. cc
    KAUST Department
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
    Date
    2016-09-21
    Online Publication Date
    2016-09-21
    Print Publication Date
    2017-01
    Permanent link to this record
    http://hdl.handle.net/10754/622240
    
    Metadata
    Show full item record
    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
    Citation
    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 BV
    Journal
    Dyes and Pigments
    DOI
    10.1016/j.dyepig.2016.09.049
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0143720816307768
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.dyepig.2016.09.049
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC); KAUST Solar Center (KSC)

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