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- W2324586482 abstract "Transient absorption (TA) spectroscopy of solution-phase mixtures of colloidal CdS quantum dots (QDs) with acid-derivatized viologen molecules, N-[1-heptyl],N′-[3-carboxypropyl]-4,4′-bipyridinium dihexafluorophosphate (V2+), indicates electron transfer occurs from the conduction band of the QD to the LUMO of V2+ after photoexcitation of a band-edge exciton in the QD. Analysis of the magnitude of the ground state bleach of the QD as a function of the molar ratio QD:V2+ yields the QD–ligand adsorption constant, Ka (4.4 × 104 M–1) for V2+ ligands adsorbed in geometries conducive to electron transfer. The value of Ka, together with the measured rates of (i) formation of the V+• electron transfer product and (ii) recovery of the ground state bleach of the QD, enables determination of the intrinsic rate constant for charge separation, kCS,int ∼ 1.7 × 1010 s–1, the rate for a single QD–V2+ donor–acceptor pair. This analysis confirms previous reports that the number of ligands adsorbed to each QD is well-described by a Poisson distribution. This is the first report where the QD–ligand charge transfer and binding equilibria are quantitatively investigated simultaneously with a single technique." @default.
- W2324586482 created "2016-06-24" @default.
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- W2324586482 date "2011-06-13" @default.
- W2324586482 modified "2023-10-07" @default.
- W2324586482 title "Simultaneous Determination of the Adsorption Constant and the Photoinduced Electron Transfer Rate for a Cds Quantum Dot–Viologen Complex" @default.
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- W2324586482 doi "https://doi.org/10.1021/ja2010237" @default.
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