An understanding of intramolecular charge transfer in two-dimensional linearly conjugated and cross-conjugated compounds is necessary for the rational design of molecular electronics and solar enegy devices. In this work, the femtosecond transient absorption spectra and kinetics of several donor-bridge-acceptor compounds containing cross-conjugated or linearly conjugated bridging groups were obtained. The veratrole group was used as the donor and the phthalimide group was used as an acceptor. The donor and acceptor were bridged by m-phenylene (mP) in the cross-conjugated compounds or 2,5-thiophene (Th) in the linearly conjugated compounds. 2-D conjugation was achieved by involving two bridging groups arranged cyclically between the donor and acceptor. We observed slower charge separation and charge recombination rates in the compounds containing a cross-conjugated bridging group than in those containing the linearly conjugated group. 2-D conjugation allows for faster charge separation rates. Highly dependent solvent dynamics were observed in the donor-bridge-acceptor compounds.

Intramolecular charge transfer and excited state processes in donor-bridge-acceptor compounds with paired linearly conjugated or cross-conjugated pathways

246th National Meeting (2013)

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