What question did this study set out to answer?

To synthesize and evaluate a rigid, electroactive ruthenium(II) bis-terpyridine dyad for reversible, redox-controlled luminescence switching.

April 29, 2005Inorganic Chemistry

Reversible Luminescence Switching in a Ruthenium(II) Bis(2,2‘:6‘,2‘ ‘-terpyridine)-Benzoquinone Dyad

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Authors

ABAndrew C. BennistonNewcastle University GCGlen M. ChapmanNewcastle University AHAnthony HarrimanAlbemarle (United States)

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Implication

Spectroscopic analysis demonstrates reversible luminescence switching in a ruthenium dyad via quinone oxidation, indicating electrochemically controlled light emission.

Key Points

To synthesize and evaluate a rigid, electroactive ruthenium(II) bis-terpyridine dyad for reversible, redox-controlled luminescence switching.
Synthesized a structurally rigid dyad containing a hydroquinone-functionalized terpyridine ligand coordinated to a ruthenium(II) phenylethynyl-terpyridine core.
Investigated photoexcitation and luminescence spectroelectrochemistry across varying temperatures in butyronitrile solution.
Applied classical Marcus theory to temperature-dependent electron-transfer rates to determine the electronic coupling matrix element and reorganization energy.
Excitation into the metal-to-ligand charge-transfer band generated an excited triplet state with a room-temperature lifetime of 46 ± 3 ns that increased at lower temperatures.
Oxidation of hydroquinone to benzoquinone initiated rapid electron transfer to the quinone, quenching luminescence and shortening the triplet lifetime to 190 ± 12 ps.
Marcus analysis revealed an electronic coupling matrix element of 22 cm⁻¹ and a reorganization energy of 0.84 eV, with the luminescence on/off switching ratio increasing as temperature decreased.

Cite This Study

Benniston et al. (2005) studied this question.

synapsesocial.com/papers/6a71831d84cc45bb7bdff646 https://doi.org/10.1021/ic050059c

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Implication

Spectroscopic analysis demonstrates reversible luminescence switching in a ruthenium dyad via quinone oxidation, indicating electrochemically controlled light emission.

Reversible Luminescence Switching in a Ruthenium(II) Bis(2,2‘:6‘,2‘ ‘-terpyridine)-Benzoquinone Dyad

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Key Points

Cite This Study

Reversible Luminescence Switching in a Ruthenium(II) Bis(2,2‘:6‘,2‘ ‘-terpyridine)-Benzoquinone Dyad

Discussion

Member takes

Implication

Key Points

Cite This Study

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