What question did this study set out to answer?

Investigate how different covalent linkages and conjugated spacer lengths between fullerene (C60) and an extended tetrathiafulvalene (exTTF) donor govern photoinduced electron transfer and charge separation.

September 10, 2003The Journal of Organic Chemistry

Probing Charge Separation in Structurally Different C₆₀/exTTF Ensembles

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Authors

MDMarta C. DíazUniversidad Complutense de Madrid MHM. Ángeles HerranzUniversidad Complutense de Madrid BIBeatriz M. IllescasUniversidad Complutense de Madrid

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Implication

Photophysical study demonstrates extended charge-separated lifetimes with vinylene spacers in fullerene-exTTF dyads, suggesting improved architectures for solar energy conversion.

Key Points

Investigate how different covalent linkages and conjugated spacer lengths between fullerene (C60) and an extended tetrathiafulvalene (exTTF) donor govern photoinduced electron transfer and charge separation.
Synthesized a series of C60-exTTF ensembles connected via an anthracene unit or dithiole ring, incorporating zero, one, or two vinylene spacer units, via 1,3-dipolar and Diels-Alder cycloadditions.
Characterized redox behavior using cyclic voltammetry and evaluated singlet excited-state deactivation pathways using steady-state and transient absorption spectroscopy in benzonitrile.
Directly linked ensembles showed rapid electron-transfer quenching yielding radical pair (C60•-–exTTF•+) lifetimes of approximately 200 ns, showing that linkage site (anthracene vs. dithiole) does not appreciably alter charge delocalization.
Incorporating conjugated vinylene spacers lengthened the donor-acceptor distance and progressively prolonged radical pair lifetimes to tau = 725 ns for one vinylene unit (5a) and tau = 1465 ns for two vinylene units (5b).

Cite This Study

Díaz et al. (2003) studied this question.

synapsesocial.com/papers/6a7ed4e7bbe73b5b5cb41e01 https://doi.org/10.1021/jo034432e

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Implication

Photophysical study demonstrates extended charge-separated lifetimes with vinylene spacers in fullerene-exTTF dyads, suggesting improved architectures for solar energy conversion.

Probing Charge Separation in Structurally Different C₆₀/exTTF Ensembles

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Implication

Key Points

Cite This Study

Probing Charge Separation in Structurally Different C₆₀/exTTF Ensembles

Discussion

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Implication

Key Points

Cite This Study

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