| 研究実績の概要 |
Fullerenes have become essential organic functional materials in a broad range of fields, including organic field-effect transistors, organic photovoltaics, and organic light-emitting diodes, etc., resulting from their high electron affinities and excellent electron transport properties. On the other hand, in organic optoelectronics and nanotechnology, origins of mobile charges play significant roles. Particularly, the information on the specific e.g. divalent ions of fullerenes is of great importance when taking into account of the roles of charge carriers in related n-type organic conductors, although the focused investigation is exceedingly scarce.
With the stepwise addition of trimethylhydroquinone dianion, a near-IR absorption band was clearly confirmed at approximately 1100 nm, which can be attributed to the generation of C60 radical anion. Interestingly, with a further increase of reductant, the 1100 nm peak decreased in intensity whereas a new signal at approximately 950 nm showed a rise. This phenomenon can be attributed to the generation of C60 dianion. Essentially the same phenomenon with the confirmation of C70 dianion was observed. The analogical generation of C60 and C70 dianions can be explained by a stepwise chemical reduction strategy.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
In this research project, the unprecedented properties and various charge transfer processes caused by excited radical ions/excited divalent ions as the super reductants and super oxidants are planned to be explored. The purposes of this research project are the clarification of excited-state dynamics and reaction mechanisms of excited radical ions/excited divalent ions and the exploration of their application for various redox systems to establish a new science field of super reductants and super oxidants.
In the current study, the reduction of fullerenes by trimethylhydroquinone dianion occurred via stepwise electron transfer from trimethylhydroquinone dianion to C60 and C70. A reliable method that selectively generates the C60 and C70 dianions was thus established for the subsequent femtosecond laser measurement of their excited states.
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