New structural insights into mechanically interlocked polymers revealed by ion mobility mass spectrometry

Charlotte A. Scarff, Jonathon R. Snelling, Matthias M. Knust, Charles L. Wilkins, James Scrivens

    Research output: Contribution to journalArticle

    34 Citations (Scopus)

    Abstract

    Mechanically interlocked polymers can possess significant additional physical properties, in comparison to those associated with their constituent parts. Their unique properties make them attractive for a range of potential applications, such as as biomaterials and molecular machines. Their efficient and reproducible synthesis is therefore of much interest. Both their synthesis and subsequent characterization are intriguing yet demanding. The properties of mechanically interlocked polymeric systems depend not only on the properties of their individual components but also on the topology of the subsequent product. Here traveling wave ion mobility mass spectrometry has been used to investigate the structural properties of a polyrotaxane system. Ion mobility studies reveal that this system remains linear in form with increase in size. Both ion mobility studies and tandem mass spectrometry studies indicate that the macrocycle preferentially remains associated with the ammonium moiety of the polymeric repeat unit and is impeded from moving freely along the axle. This is consistent with NMR observations of the average structure. Analysis of mechanically interlocked polymers by ion mobility mass spectrometry provides additional structural insights into these systems relating to dynamics, heterogeneity, and topology. This molecule-specific information is vital in order to understand the origin of a systems functional properties.

    Original languageEnglish
    Pages (from-to)9193-9198
    Number of pages6
    JournalJournal of the American Chemical Society
    Volume134
    Issue number22
    DOIs
    Publication statusPublished - 6 Jun 2012

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