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Securing a rotaxane architecture (1H+) by threading a ring (DB24C8) onto an axle (L1) and tying a molecular stopper knot. a) Partial 1H NMR spectrum (600 MHz, MeCN‐d 3, 298 K) stack plot of the threading process to form L1H+⋅DB24C8 (Scheme 1, step (i)), showing signals for Hc and Hf1/Hf2. b) Detection of knotted, threaded 1H+ by ESI‐MS (positive mode) following in situ tying of an overhand stopper knot in L1H+⋅DB24C8 through coordination to Lu3+ (Scheme 1, step (ii)).
