作者:Junpeng Wang、Tatiana B. Kouznetsova、Zachary S. Kean、Lin Fan、Brendan D. Mar、Todd J. Martínez、Stephen L. Craig
DOI:10.1021/ja509585g
日期:2014.10.29
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 (gDCC) 电环开环的力诱导加速对 gDCC 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 gDCC 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。