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This log is © The Royal Society of Chemistry 2019.Chemical defense is an essential tool in synthetic chemistry, that involves preventing reactive sites on a molecule through covalent bonds. Physical approaches, such encapsulation and host-mediated security, have emerged as interesting choices which use steric bulk to restrict reactivity. Here, we report the defense of a redox-active viologen through its incorporation into mechanically interlocked molecules (MIMs), specifically hetero[4]rotaxa