gDCC. On the ∼0.1 s time scale of the experiment, the force required to open the E-alkene-substituted gDCC was found to be 0.4 nN lower than that required in the corresponding Z-alkene isomer, despite the effectively identical force-free reactivities of the two isomers and the distance between the stereochemical permutation and the scissile bond of the mechanophore. Fitting the experimental data with
增加机械团活性的分子机制可能为机械
化学活性聚合物材料提供新的
化学反应和增强的应力响应行为。在这里,单分子力谱表明,gem-二
氯环丙烷 (g
DCC) 电环开环的力诱导加速对 g
DCC 上 α-烯烃取代基的立体
化学敏感。在实验的~0.1 s 时间尺度上,发现打开 E-烯烃取代的 g
DCC 所需的力比相应的 Z-烯烃异构体所需的力低 0.4 nN,尽管有效相同的无力反应性两种异构体以及立体
化学排列与机械团的易裂键之间的距离。