For the first time an anionic donor, the perchlorotriphenylmethide anion (PTMâ), has been covalently bonded to C60, generating the C60â(PTMâ)2 triad that is reversibly oxidized to the corresponding C60âperchlorotriphenylmethyl radical triad C60â(PTMË)2. For the triad C60â(PTMâ)2, photoinduced charge-separation can be confirmed to occur via the excited singlet states of the C60 moiety and the PTM anion in polar and nonpolar solvents from quenching of their fluorescence intensities in the region of 700â750 nm and 560â630 nm, respectively. The charge-separation state was confirmed by the nanosecond transient absorption spectra in the visible and near-IR spectral regions. After charge-separation, back electron transfer takes place with a lifetime of about 80 ns. Steady-state concentration of the highly persistent PTM radical was observed after repeated laser light irradiation.
一种阴离子供体--全
氯三苯
甲烷阴离子(
PTMâ)首次与 C60 发生共价键合,生成 C60â(
PTMâ)2 三元组,并可逆地氧化成相应的 C60â 全
氯三苯
甲烷自由基三元组 C60â(
PTMË)2。对于三元组 C60â(
PTMâ)2,在极性和非极性溶剂中,C60 分子和
PTM 阴离子的激发单线态的荧光强度分别在 700-750 纳米和 560-630 纳米区域淬灭,从而证实了光诱导的电荷分离。可见光和近红外光谱区的纳秒级瞬态吸收光谱证实了电荷分离状态。电荷分离后,会发生寿命约为 80 毫微秒的反向电子转移。在重复激光照射后,可以观察到高持久性
PTM 自由基的稳态浓度。