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    Macroscopic manifestation of a vapour-induced molecular switching phenomenon

    Year: 2010

    Journal: Soft Matter, 2010, 6 (14), 3157-3159, 20131009

    Authors: T. H. Richardson, S. Brittle, A. J. Parnell, A. Fryer, T. McCaig, A. Hobson, A. D. F. Dunbar, J. Hutchinson, C. A. Hunter

    Organizations: Department of Physics, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, UK; Department of Chemical & Process Engineering, University of Sheffield, Mappin Street, Sheffield, UK; Department of Chemistry, University of Sheffield, Dainton Building, Brook Hill, Sheffield, UK

    We report a molecular switching event that leads to a reversible large-scale expansion of a floating porphyrin Langmuir layer residing at the air–water interface. This vapour-induced protonation–deprotonation mechanism, responsible for the expansion–contraction cycle, could potentially be exploited in applications in which a physical shape-change is triggered by exposure to an acidic or basic gas.