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Title
Secondary Isotope Effects on the Deslipping Reaction of Rotaxanes: High-Precision Measurement of Steric Size ( We thank Prof. Fritz Vögtle and Dipl.-Chem. Sonja Müller for continuous support and inspiring discussions, and Claus Schmidt and Hannelore Spitz for their help with recording a large number of <sup>1</sup>H NMR experiments. The Fonds der Chemischen Industrie and the Deutsche Forschungsgemeinschaft are gratefully acknowledged for financial support. )