Two photoswitchable arylazopyrozoles form hydrogels at a concentration of 1.2 % (w/v). With a molecular weight of 258.28 g mol−1, these are the lowest known molecular weight hydrogelators that respond reversibly to light. Photoswitching of the E‐ to the Z‐form by exposure to 365 nm light results in a macroscopic gel→sol transition; nearly an order of magnitude reduction in the measured elastic and
两个可光转换的芳基偶氮
吡唑形成浓度为1.2%(w / v)的
水凝胶。分子量为258.28 g mol -1,这些是已知的最低分子量的
水凝胶剂,可对光产生可逆的响应。通过暴露于365 nm的光,将E-转换为Z-形,可产生宏观的凝胶→溶胶转变;所测得的弹性模量和损耗模量降低了近一个数量级。就间芳基偶氮
吡咯而言,低温透射电子显微镜表明,在以光为主的Z溶液状态下,以E-gel状态存在的29±7 nm宽薄片会缩小至13±2 nm。间芳基偶氮
吡唑的光开关可通过365 nm和520 nm激发的循环进行逆转,而不会产生疲劳。在365 nm的光进行光切换后,封装在由芳基偶氮唑形成的凝胶中的
若丹明B染料的释放被加速了20倍以上,