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    Photophysical characterization and time-resolved spectroscopy of a anthradithiophene dimer: exploring the role of conformation in singlet fission

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    Type
    Article
    Authors
    Dean, Jacob C. cc
    Zhang, Ruomeng
    Hallani, Rawad
    Pensack, Ryan D.
    Sanders, Samuel N.
    Oblinsky, Daniel G.
    Parkin, Sean R.
    Campos, Luis M.
    Anthony, John E.
    Scholes, Gregory D. cc
    KAUST Department
    KAUST Solar Center (KSC)
    Date
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/625742
    
    Metadata
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    Abstract
    Quantitative singlet fission has been observed for a variety of acene derivatives such as tetracene and pentacene, and efforts to extend the library of singlet fission compounds is of current interest. Preliminary calculations suggest anthradithiophenes exhibit significant exothermicity between the first optically-allowed singlet state, S1, and 2 × T1 with an energy difference of >5000 cm−1. Given the fulfillment of this ingredient for singlet fission, here we investigate the singlet fission capability of a difluorinated anthradithiophene dimer (2ADT) covalently linked by a (dimethylsilyl)ethane bridge and derivatized by triisobutylsilylethynyl (TIBS) groups. Photophysical characterization of 2ADT and the single functionalized ADT monomer were carried out in toluene and acetone solution via absorption and fluorescence spectroscopy, and their photo-initiated dynamics were investigated with time-resolved fluorescence (TRF) and transient absorption (TA) spectroscopy. In accordance with computational predictions, two conformers of 2ADT were observed via fluorescence spectroscopy and were assigned to structures with the ADT cores trans or cis to one another about the covalent bridge. The two conformers exhibited markedly different excited state deactivation mechanisms, with the minor trans population being representative of the ADT monomer showing primarily radiative decay, while the dominant cis population underwent relaxation into an excimer geometry before internally converting to the ground state. The excimer formation kinetics were found to be solvent dependent, yielding time constants of ∼1.75 ns in toluene, and ∼600 ps in acetone. While the difference in rates elicits a role for the solvent in stabilizing the excimer structure, the rate is still decidedly long compared to most singlet fission rates of analogous dimers, suggesting that the excimer is neither a kinetic nor a thermodynamic trap, yet singlet fission was still not observed. The result highlights the sensitivity of the electronic coupling element between the singlet and correlated triplet pair states, to the dimer conformation in dictating singlet fission efficiency even when the energetic requirements are met.
    Citation
    Dean JC, Zhang R, Hallani RK, Pensack RD, Sanders SN, et al. (2017) Photophysical characterization and time-resolved spectroscopy of a anthradithiophene dimer: exploring the role of conformation in singlet fission. Phys Chem Chem Phys 19: 23162–23175. Available: http://dx.doi.org/10.1039/c7cp03774k.
    Sponsors
    The authors gratefully acknowledge the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy through Grant No. DE-SC0015429. SNS thanks the NSF GRFP for funding (grant DGE 11-44155). JEA and RKH thank the U.S. National Science Foundation (grant CMMI-1255494) for support of organic semiconductor synthesis. Triplet sensitization measurements were done using resources of the Center for Functional Nanomaterials, which is a U.S. DOE Office of Science Facility, at Brookhaven National Laboratory under Contract No. DESC0012704.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Physical Chemistry Chemical Physics
    DOI
    10.1039/c7cp03774k
    Additional Links
    http://pubs.rsc.org/en/Content/ArticleLanding/2017/CP/C7CP03774K#!divAbstract
    Relations
    Is Supplemented By:
    • [Dataset]
      . DOI: 10.5517/ccdc.csd.cc1p55z0 HANDLE: 10754/663859
    Is Supplemented By:
    • [Dataset]
      . DOI: 10.5517/ccdc.csd.cc1p55yz HANDLE: 10754/663860
    ae974a485f413a2113503eed53cd6c53
    10.1039/c7cp03774k
    Scopus Count
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    Articles; KAUST Solar Center (KSC)

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