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光致变色吲哚啉螺苯并吡喃类化合物的紫外可见光谱已被广泛研究,但无光致变色性能的这类螺环的研究工作却很少见到。我们用改进的方法合成了六种1-苄基-3,3-二甲基吲哚啉螺苯并吡喃衍生物,其中题示化合物(用BSP-5表示)为新化合物。经试验证明,BSP-5不具光致变色性能。本文报道它在环己烷等7种溶剂中的紫外可见光谱。在此基础上提出了BSP-5的酸致变色原理。
UV-Vis spectra of photochromic indolomospirobenzopyran compounds have been studied extensively, but the work of such spiro-rings without photochromic properties is seldom seen. We synthesized six kinds of 1-benzyl-3,3-dimethylindoline spirobenzopyran derivatives by a modified method. Among them, the title compound (represented by BSP-5) is a new compound. The test proved that, BSP-5 does not have photochromic properties. This article reports its UV-visible spectrum in seven solvents, including cyclohexane. Based on this, the principle of acid-induced discoloration of BSP-5 was proposed.