A solvent-driven molecular spring
作者： Zibin Zhang , Chengyou Han , Guocan Yu , Feihe Huang
DOI: 10.1039/C2SC20728A
关键词:
摘要: A solvent-driven doubly threaded rotaxane dimer based on an amino-modified copillar[5]arene was prepared using bis(trifluoromethyl)phenyl isocyanate as stoppers. By comparison of proton NMR spectra the and control compound, inclusion-induced shielding effects decyl protons dumbbell compound were estimated. From crystal structures previously reported analogous pillar[5]arene/alkane pseudorotaxanes, we know that four methylenes can be totally encapsulated in pillar[5]arene cavity. When a is swaying along guest with long linear alkyl chain (more than methylenes), its cavity statistically locates whose showed relatively larger upfield shifts. Based this, length In CDCl3, it contracted state 31 A. DMSO-d6, extended 37 Moreover, polarity solvent changing, change continuously contraction/stretching systems work living organisms. Therefore, this molecular spring needed.
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