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Effect of donor orientation on ultrafast intermolecular electron transfer in coumarin-amine systems
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10.1063/1.2975192
/content/aip/journal/jcp/129/11/10.1063/1.2975192
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/11/10.1063/1.2975192

Figures

Image of FIG. 1.
FIG. 1.

Fluorescence transient decays for C151 dye at different mole fractions of (a) DMAN [, 0.443, 0.649, 0.877, and 1] and (b) TEA [, 0.443, 0.755, and 1]. The diluents were the appropriate cyclohexane-ethyl acetate solvent mixtures. The dotted line in (a) indicates the IRF. Inset demonstrates the quality of the fitting along with the residual for the C151-DMAN system with : (○) experimental data point; (—) fitted data.

Image of FIG. 2.
FIG. 2.

Changes in the fastest fluorescence decay time for C151 dye at different mole fractions of (a) DMAN and (b) DEAN. The solution was diluted with appropriate cyclohexane-ethyl acetate solvent mixtures.

Image of FIG. 3.
FIG. 3.

Changes in the fastest fluorescence decay time for C151 dye at different mole fractions of DMAN. The solution was diluted with acetonitrile solvent.

Image of FIG. 4.
FIG. 4.

Changes in the fastest fluorescence decay time for C151 dye at different mole fractions of TEA. The solution was diluted with appropriate cyclohexane-ethyl acetate solvent mixtures.

Image of FIG. 5.
FIG. 5.

The plot of the relative area under the SS fluorescence spectra against the average lifetime values for C151-DMAN systems at different amine dilutions (see Table III). The plot is linear within experimental error. Inset: (a) Expanded plot for the lower amine dilution regions as indicated by the arrow. (b) SS emission spectra for the C151-DMAN system without any amine dilution.

Tables

Generic image for table
Table I.

Fluorescence decay parameters of C151 dye in different amine solvents and at different dilutions of the amines using cyclohexane-ethyl acetate mixed solvent as the diluents. The redox potentials of the acceptors and donors are listed as follows. The oxidation potentials of DMAN, DEAN, and TEA are 0.76, 0.72, and , respectively, and the reduction potential of C151 dye is . All these values are in acetonitrile solution against saturated calomel electrode (Refs. 27 and 66).

Generic image for table
Table II.

Fluorescence decay parameters of C151 dye in DMAN at different dilutions using acetonitrile solvent as the diluent.

Generic image for table
Table III.

Relative area under the steady-state fluorescence spectra of the C151-DMAN system at different amine dilutions, where cyclohexane-ethyl actate mixed solvents were used as the diluents. The average fluorescence lifetime in the respective cases are also listed.

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/content/aip/journal/jcp/129/11/10.1063/1.2975192
2008-09-16
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of donor orientation on ultrafast intermolecular electron transfer in coumarin-amine systems
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/11/10.1063/1.2975192
10.1063/1.2975192
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