作者:Stanislav L. Bondarev、Sergei A. Tikhomirov、Oleg V. Buganov、Valeri N. Knyukshto、Nikolaii A. Galinovskii、Roman G. Fedunov、Svetlana S. Khokhlova、Anatoly I. Ivanov
DOI:10.1021/acs.jpca.8b11146
日期:2019.2.28
Nitro derivatives of xanthione, 2,7-dinitro-9H-xanthene-9-thione and 2,4,7-trinitro-9H-xanthene-9-thione, have been first synthesized and their stationary and transient spectra have been measured. The stationary spectra show that the attachment of the nitro groups to the xanthione scaffold leads to strong quenching of S2 → S0 fluorescence and the decrease of the oscillator strength of the S2 ← S0 electronic
首次合成了黄嘌呤,2,7-二硝基-9 H-黄嘌呤-9-硫酮和2,4,7-三硝基-9 H-黄嘌呤-9-硫酮的硝基衍生物,并测量了它们的固定光谱和瞬态光谱。固定光谱表明,硝基与氧杂蒽酮骨架的连接导致S 2 →S 0荧光的强烈淬灭和S 2 ←S 0电子跃迁的振荡强度的降低。瞬态吸收光谱的分析揭示了第二激发态S 2的超快受激发射猝灭,在两个导数中。已经提出了一种动力学方案来合理化瞬态吸收信号的复杂频谱动力学。动力学方案是由对瞬态光谱的分析得出的,并得到了量子化学计算的支持,量子化学计算预测了暗态和S 2态分裂为两个接近的水平的存在。S 2状态子级之间的超快速跃迁和向暗态的跃迁在光谱动力学中起着至关重要的作用。在黄酮的硝基衍生物中发现的这些新特征从本质上将它们的光谱动力学与在黄酮中观察到的光谱动力学区分开来。