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报导了一种吲哚啉螺吡喃(SP)在丙酮溶液中热致变色平衡常数的新测定方法.通过分别检测紫外光照射SP后生成有色体的褪色过程和避光条件下其开环异构体与Cu(Ⅱ)的配合物形成过程,求得闭环无色体的开环速度常数kf和开环有色体的闭环褪色速度常数(kr)分别为4.94×10-4s-1和9.8×10-2s-1.利用Ke=kf/kr,可求得Ke为5.0×10-3.此方法有助于解决Flannery等人方法中对不同溶剂ε估值所带来误差的问题.
A new method for the determination of the thermochromic equilibrium constant of indoline spiropyran (SP) in acetone solution was reported. The open-loop rate constants kf and kf of the closed-ring chromophore were determined by detecting the fading of the chromophores and the formation of the complexes of the ring-opened isomers with Cu (II) under UV-light irradiation, respectively The closed-loop fading rate constants (kr) of the ring color bodies are 4.94 × 10 -4 s -1 and 9.8 × 10 -2 s -1, respectively. Using Ke = kf / kr, Ke can be obtained as 5.0 × 10-3. This method helps to solve the problem of error caused by the method of Flannery et al.