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    Vibrational properties of organic donor-acceptor molecular crystals: Anthracene-pyromellitic-dianhydride (PMDA) as a case study

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    Type
    Article
    Authors
    Fonari, A.
    Corbin, N. S. cc
    Vermeulen, D.
    Goetz, K. P.
    Jurchescu, O. D.
    McNeil, L. E. cc
    Bredas, Jean-Luc cc
    Coropceanu, V.
    KAUST Department
    KAUST Solar Center (KSC)
    Laboratory for Computational and Theoretical Chemistry of Advanced Materials
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-12-12
    Online Publication Date
    2015-12-12
    Print Publication Date
    2015-12-14
    Permanent link to this record
    http://hdl.handle.net/10754/584256
    
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    Abstract
    We establish a reliable quantum-mechanical approach to evaluate the vibrational properties of donor-acceptor molecular crystals. The anthracene-PMDA (PMDA = pyromellitic dianhydride) crystal, where anthracene acts as the electron donor and PMDA as the electron acceptor, is taken as a representative system for which experimental non-resonance Raman spectra are also reported. We first investigate the impact that the amount of nonlocal Hartree-Fock exchange (HFE) included in a hybrid density functional has on the geometry, normal vibrational modes, electronic coupling, and electron-vibrational (phonon) couplings. The comparison between experimental and theoreticalRaman spectra indicates that the results based on the αPBE functional with 25%-35% HFE are in better agreement with the experimental results compared to those obtained with the pure PBE functional. Then, taking αPBE with 25% HFE, we assign the vibrational modes and examine their contributions to the relaxation energy related to the nonlocal electron-vibration interactions. The results show that the largest contribution (about 90%) is due to electron interactions with low-frequency vibrational modes. The relaxation energy in anthracene-PMDA is found to be about five times smaller than the electronic coupling.
    Citation
    Vibrational properties of organic donor-acceptor molecular crystals: Anthracene-pyromellitic-dianhydride (PMDA) as a case study 2015, 143 (22):224503 The Journal of Chemical Physics
    Publisher
    AIP Publishing
    Journal
    The Journal of Chemical Physics
    DOI
    10.1063/1.4936965
    Additional Links
    http://scitation.aip.org/content/aip/journal/jcp/143/22/10.1063/1.4936965
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4936965
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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