The synthesis of three novel pyrazolo[60]fullerene derivatives containing electron-withdrawing substituents has been described. High solubility in ordinary organic solvents was proved. Their electrochemical properties of pyrazolo[60]fullerenes showed better electron affinity than pristine C60 in the ground state. The nanosecond transient absorption spectra showed clear evidence for photoinduced electron transfer from TTF to the excited triplet state of the pyrazolo[60]fullerenes, in which stronger electron-withdrawing substituents accelerate the rates of the photoinduced electron-transfer, indicating a high electron-acceptor ability of the excited triplet state of pyrazolo[60]fullerenes.
本研究描述了三种新型
吡唑并[60]
富勒烯衍
生物的合成过程,这些衍
生物含有抽电子取代基。这些衍
生物在普通有机溶剂中具有很高的溶解度。
吡唑并[60]
富勒烯的电
化学性质显示出比基态原始 C60 更好的电子亲和性。纳秒瞬态吸收光谱显示,有明显的证据表明光诱导电子从
TTF 转移到
吡唑并[60]
富勒烯的激发三重态,其中较强的吸电子取代基加速了光诱导电子转移的速率,这表明
吡唑并[60]
富勒烯的激发三重态具有较高的电子接受能力。