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A dumbbell-like molecule 3 consisting of one benzyl viologen unit and two end stoppers was synthesized and transformed into a [2]rotaxane R3 by slipping a CB[7] ring over the isophthalic acid stopper onto the viologen group. The 1H NMR, ESR and UV–Vis measurements indicated that R3 kept stable under the chemical reduction with excess Na2S2O4 while 3 would decompose. The CV curve of R3 showed a more...
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