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The solution‐phase photooxygenation of multiply threaded crown/ammonium pseudorotaxanes containing anthracene spacers is monitored by electrospray ionization Fourier‐transform ion‐cyclotron‐resonance (ESI‐FTICR) mass spectrometry. The oxygenated pseudorotaxanes are mass‐selected and fragmented by infrared multiphoton dissociation (IRMPD) and/or collision‐induced dissociation (CID) experiments and...
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