Bidirectional photoswitching of arylazopyrazoles with visible light is enabled by substitution with pyrrolidine and piperidine in the ortho-position of the phenyl ring. The absorption maxima were red-shifted and the molar absorption coefficients in the visible range increased significantly, allowing the use of blue light (λ = 465 nm) for the E → Z isomerization and red light (λ = 600 nm) for the Z → E isomerization. N-Methylation of the pyrazole leads to an excellent thermal stability of the Z isomer.

中文翻译：

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红光对邻氨基芳基吡唑的光开关

通过在苯环的邻位用吡咯烷和哌啶取代，可以实现芳基唑并吡唑在可见光下的双向光开关。吸收最大值红移，可见光范围内的摩尔吸收系数显着增加，允许使用蓝光（λ = 465 nm）进行 E → Z 异构化和红光（λ = 600 nm）用于 Z → E 异构化。吡唑的N-甲基化导致 Z 异构体具有优异的热稳定性。