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  • Title: Photoinduced charge transport over branched conjugation pathways: donor-acceptor substituted 1,1-diphenylethene and 2,3-diphenylbutadiene.
    Author: van Walree CA, van der Wiel BC, Williams RM.
    Journal: Phys Chem Chem Phys; 2013 Sep 28; 15(36):15234-42. PubMed ID: 23928894.
    Abstract:
    Photoinduced charge transport in 1,1-diphenylethene and 2,3-diphenylbutadiene functionalized with an electron donating dimethylamino group and an electron accepting cyano group is reported. UV-spectroscopy reveals that in these compounds, which incorporate a cross-conjugated spacer, a direct charge transfer transition is possible. It is shown by application of the generalized Mulliken-Hush approach that introduction of an additional branching point in the π-electron spacer (i.e., when going from the 1,1-diphenylethene to the 2,3-diphenylbutadiene) leads to only a moderate reduction (68-92%) of the electronic coupling between the ground and the charge separated state. The σ-electron system is however likely to be dominant in the photoinduced charge separation process.
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