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Energy- and charge-transfer processes in flexible organic donor-acceptor dyads
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10.1063/1.3245955
/content/aip/journal/jcp/131/14/10.1063/1.3245955
http://aip.metastore.ingenta.com/content/aip/journal/jcp/131/14/10.1063/1.3245955

Figures

Image of FIG. 1.
FIG. 1.

Reference systems , , , and and donor-bridge-acceptor dyads , , and . Donor : -tetraphenylbenzidine. Acceptor : -bis(1-heptyloctyl)-perylene-3,4:9,10-tetracarboxylic bis-imide. Donor-bridge-acceptor molecules: : -[12-(4-benzyloxy)--triphenyl benzidine) dodecyl]--(1-heptyloctyl)-perylene-3,4:9,10-tetracarboxylic bisimide; : -[18-(4-benzyloxy)--triphenyl benzidine) octadecyl]--(1-heptyloctyl)-perylene-3,4:9,10-tetracarboxylic bisimide; : -[11-(-(4-benzyloxy) , triphenylbenzidinyl) 3,6,9-trioxaundecanyl)]--(1-heptyloctyl)perylene-3,4:9,10-tetracarboxylic bisimide.

Image of FIG. 2.
FIG. 2.

Synthetic scheme for donor-bridge-acceptor systems and .

Image of FIG. 3.
FIG. 3.

Steady-state spectra of , , and in toluene . (a) Absorption. The excitation wavelengths that have been used for fluorescence emission spectroscopy are indicated by the arrows. [(b) and c)] Fluorescence emission for excitation at and 460 nm, respectively.

Image of FIG. 4.
FIG. 4.

Streak camera experiment for in toluene ( and excitation at 350 nm). (a) Streak image. The horizontal axis corresponds to wavelength, the vertical axis corresponds to time, and the detected intensity is given by the gray scale (black represents low intensity and white represents high intensity). (b) Integration of the streak image along the time axis within the boxed regions marked as (black line) and (gray line) in (a). (c) Integration of the streak image along the wavelength axis within the boxed regions marked as donor (full black line) and acceptor (gray line) in (a). The IRF is given by the dashed line.

Image of FIG. 5.
FIG. 5.

Time-resolved fluorescence data for the donor moiety (integration of the spectral region of 380–500 nm). Fluorescence decay curves of (triangles), (circles), (squares), and (diamonds) in toluene for an excitation wavelength of 350 m. For better comparison the data have been normalized.

Image of FIG. 6.
FIG. 6.

Time-resolved fluorescence data for the acceptor moiety (integration of the spectral region of 530–650 nm). Fluorescence decay curves of the acceptor in (triangles), (circles), (squares), and (diamonds) measured in toluene for an excitation wavelength of 350 nm. (a) For a 10 ns time-frame. (b) On a 300 ps time-frame. For better comparison the transients have been normalized to an amplitude .

Image of FIG. 7.
FIG. 7.

Pump-probe spectroscopy. (a) Transient-absorption spectrum of in acetone, pump wavelength of 330 nm, and at after the pump pulse. (b) Time trace of the same sample taken at a probe wavelength of 700 nm. The transient-absorption signal is given as a change in optical density, , with respect to the ground state.

Image of FIG. 8.
FIG. 8.

Scenarios of possible energy- and charge-transfer processes in the dyads. (a) Energy transfer from the donor to the acceptor. (b) Energy transfer from the donor to the acceptor followed by an electron transfer from the HOMO of the donor to the HOMO of the acceptor. (c) Energy transfer from the donor to the acceptor followed by an electron transfer from the LUMO of donor to the LUMO of the acceptor. For more details see text.

Tables

Generic image for table
Table I.

Comparison of the fluorescent transients of the donor moiety for the isolated donor , the donor-bridge system , and the three dyads , , and in toluene ( and excitation at 350 nm).

Generic image for table
Table II.

Comparison of the fluorescent transients of the acceptor moiety for the isolated acceptor , the donor-bridge system , and the three dyads , , and in toluene . The rising component was observed only for excitation at 350 nm (and not for excitation at 460 nm). The decay times apply for both excitations at 350 and 460 nm.

Generic image for table
Table III.

Acceptor decay times (in nanoseconds) for the three dyads , , and in different solvents . The data apply for excitation both at 350 and 460 nm.

Generic image for table
Table IV.

Energy-transfer efficiencies and energy-transfer rates in the three dyads , , and in toluene .

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/content/aip/journal/jcp/131/14/10.1063/1.3245955
2009-10-13
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energy- and charge-transfer processes in flexible organic donor-acceptor dyads
http://aip.metastore.ingenta.com/content/aip/journal/jcp/131/14/10.1063/1.3245955
10.1063/1.3245955
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