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- W2050173071 abstract "The potential of dimethylsilylene and isopropylidene σ-spacers as bridges for photoinduced charge transfer (CT) in 4-cyano-4‘-(dimethylamino)- and 4-cyano-4‘-methoxy-substituted diphenyldimethylsilanes and 2,2-diphenylpropanes was studied. Fluorescence solvatochromism and time-resolved microwave conductivity measurements show that upon photoexcitation a charge separated state (D•+σA•-)* is populated in all compounds. Excited state dipole moments for a given donor−acceptor combination are, irrespective of the bridge, equal. The CT states of the silanes are however lying at lower energies, implying that the presence of silicon thermodynamically facilitates the CT process. Cyclic voltammetry data of model compounds show that this is a consequence of the lowering of the acceptor reduction potential by the silicon bridge. It was however inferred from radiative decay rates that the electronic coupling between the CT and locally excited states as well as the coupling between the ground and CT state is larger for the carbon-bridged compounds. As shown by both solution and solid state electronic spectra and radiative decay rates, the photophysics of the DσA compounds are dominated by intensity borrowing of the CT transitions from transitions localized in the Dσ and σA chromophores." @default.
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- W2050173071 date "1996-01-01" @default.
- W2050173071 modified "2023-10-16" @default.
- W2050173071 title "Comparison between SiMe<sub>2</sub> and CMe<sub>2</sub> Spacers as σ-Bridges for Photoinduced Charge Transfer" @default.
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- W2050173071 doi "https://doi.org/10.1021/ja960546e" @default.
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