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本文合成了1,3,3,2′-四甲基-9′-甲氧基螺[吲哚啉-2,3′-[3H]萘并[2,1-6][1,4](口恶)嗪](Ⅰ),并用纳秒时间分辨吸收光谱技术研究了其光致变色过程。Ⅰ的溶液受248nm激光脉冲激发后产生一个有色体,它具有两个吸收峰:在环己烷中为470nm和640nm,在乙腈中为460nm和670nm。该有色体按一级动力学规律衰变,其寿命在环己烷和乙腈中分别为0.5μs和1.3μs,因而被认为是分子内的电荷分离中间体。但未观察到部花青的吸收。从分子结构和势能面的角度解释了这种现象。
In this paper, 1,3,3,2’-tetramethyl-9’-methoxyspiro [indoline-2,3’- [3H] naphtho [2,1-6] (OX) oxazine] (Ⅰ), and its photochromic process was studied by nanosecond time-resolved absorption spectroscopy. A solution of I was excited by a 248 nm laser pulse to give a colored body with two absorption peaks: 470 nm and 640 nm in cyclohexane and 460 nm and 670 nm in acetonitrile. The chromophore decays according to the first order kinetics and its lifetime is 0.5μs and 1.3μs in cyclohexane and acetonitrile, respectively, which is considered as the intramolecular charge separation intermediate. However, no absorption of merocyanine was observed. This phenomenon is explained from the perspective of molecular structure and potential energy.