Ramos, Alicia Marcos; Beckers, Edwin H. A.; Offermans, Ton; Meskers, Stefan C. J.; Janssen, Rene A. J. published the artcile< Photoinduced Multistep Electron Transfer in an Oligoaniline-Oligo(p-phenylene Vinylene)-Perylene Diimide Molecular Array>, Reference of 112-63-0, the main research area is photoinduction multistep electron transfer oligoaniline oligophenylene vinylene perylene diimide.
Photoinduced multistep electron transfer has been studied in two sym. oligoaniline-oligo(p-phenylene vinylene)-perylene diimide-oligo(p-phenylene vinylene)-oligoaniline (OAn-OPV-PERY-OPV-OAn) multichromophore arrays with fluorescence and transient absorption spectroscopy in the femtosecond and nanosecond time domains. The arrays consist of a sym. donor(2)-donor(1)-acceptor-donor(1)-donor(2) arrangement, with two OAn-OPV segments coupled to a central PERY unit via a direct linkage (1) or a saturated spacer (2). Photoexcitation gives the OAn-OPV+•-PERY-•-OPV-OAn as the primary charge-separated state. For 1 the transfer is extremely fast (kCS > 1000 ns-1) in polar and apolar solvents, while the rate constants for recombination differ and are significantly higher in polar solvents than in apolar solvents because recombination occurs in the Marcus inverted region. Charge separation and charge recombination are slower in 2, because the saturated spacer reduces the electronic coupling between OPV donor and PERY acceptor. The primary OAn-OPV+•-PERY-•-OPV-OAn charge-separated state can rearrange in a charge-shift reaction to the OAn+•-OPV-PERY-•-OPV-OAn state. This charge shift is exergonic and competes with fast charge recombination. In polar solvents the efficiency of the charge shift is about 0.22 and 0.28 for 1 and 2, resp., and only weakly dependent on the polarity. In toluene the two charge-separated states are nearly isoenergetic for 1, and hence, no shift is observed in toluene. The OAn+•-OPV-PERY-•-OPV-OAn charge-separated state has a long lifetime as a result of the negligible interaction between the distant OAn+• and PERY-• redox sites and can be observed up to several microseconds.
Journal of Physical Chemistry A published new progress about Chromophores. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.
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