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Gigantic Magnetic Field Effect on the Long-Lived Intermolecular Charge-Separated State Created at the Nonionic
Tomoaki Miura1, Kiminori Maeda2, Yoshimi Oka3
1Department of Chemistry , Niigata University , 2-8050 Ikarashi, Nishi-ku , Niigata 950-2181 , Japan.
The Journal of Physical Chemistry. B
|November 17, 2018
Summary
Researchers created a long-lived charge-separated state using metal porphyrins and alkyl viologens in a vesicle membrane. A magnetic field significantly boosted this state, paving the way for new energy conversion materials.
Area of Science:
- Supramolecular chemistry
- Photochemistry
- Materials science
Background:
- Supramolecular chemistry offers a low-cost alternative to covalent synthesis for organic photon-energy conversion.
- Intermolecular donor-acceptor systems are crucial for efficient energy conversion.
Purpose of the Study:
- To photogenerate a long-lived intermolecular charge-separated (CS) state using metal porphyrins (donor) and alkyl viologens (acceptor).
- To investigate the effect of magnetic fields on the CS state dynamics.
- To explore potential applications in light energy conversion and beyond.
Main Methods:
- Self-assembly of nonionic surfactant and cholesterol to form vesicle membranes.
- Photogeneration of intermolecular charge-separated states.
- Transient absorption spectroscopy to monitor CS state dynamics.
- Spin dynamics simulations to analyze recombination and dissociation-re-encounter processes.
Main Results:
- A long-lived (∼3 μs) intermolecular CS state was achieved at the vesicle membrane interface.
- The CS state concentration increased by ∼100% under a 250 mT magnetic field at room temperature.
- Negligibly low yield of escaped free radicals was observed.
- Spin-selective recombination and dissociation-re-encounter dynamics were identified as key factors.
Conclusions:
- The supramolecular approach enables efficient photogeneration of long-lived CS states.
- Gigantic magnetic field effects on CS state dynamics were demonstrated.
- The findings suggest potential for developing novel materials for light energy conversion, drug delivery, and bioprobes.
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