Air-Stable Open-shell Organic Molecules: Syntheses of Electronic-Spin Delocalized Neutral Radicals and Dynamic Electronic-Spin Physical Properties

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  • 空気中でも安定な開殻有機分子：電子スピン非局在型中性ラジカルの合成と動的電子スピン物性
  • クウキ チュウ デモ アンテイ ナ カイカクユウキ ブンシ : デンシ スピン ヒキョクザイガタ チュウセイ ラジカル ノ ゴウセイ ト ドウテキ デンシ スピン ブッセイ

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Abstract

Studies on air-stable organic neutral radicals have a history of about 110 years since the first synthesis of triphenylmethyl radical. Physical properties of organic neutral radicals have given substantial far-reaching effects and inspirations for development of molecule-based functionality materials. For the last two decades, we have designed and synthesized novel air-stable organic neutral radicals based on phenalenyl known as an odd-alternant hydrocarbon neutral radical. These radicals possess extremely delocalized electronic-spin natures and high redox abilities. Utilization of high redox ability of the radicals for charge-discharge processes has realized new secondary batteries with high discharge capacity exceeding those of the high-performance lithium-ion secondary batteries. In this review, we describe design and synthesis of our phenalenyl-based stable neutral radicals, their dynamic electronic-spin physical properties, and our challenges for application to secondary batteries.

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