Crystalline self-assembly into monolayers of folded oligomers at the air-water interface

K. Lederer, A. Godt, P.B. Howes, K. Kjær, J. Als-Nielsen, M. Lahav, G. Wegner, L. Leiserowitz, I. Weissbuch

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Insertion of the 115-bis(ethynylene)benzene unit as a rigid spacer into a linear alkyl chain, thus separating the two resulting stems by 9 Angstrom, induces chain folding at the air-water interface. These folded molecules self-assemble into crystalline monolayers at this interface, with the plane of the folding unit almost perpendicular to the water surface, as determined by synchrotron grazing-incidence X-ray diffraction. Three distinct molecular shapes, of the types U, inverted U, and M, were obtained in the two-dimensional crystalline state, depending upon the number of spacer units, and the number and position of the hydrophilic groups in the molecule. The molecules form ribbons with a higher crystal coherence in the direction of stacking between the molecular ribbons, and a lower coherence along the ribbon direction. A similar molecule, but with a spacer unit that imposes a 5 Angstrom separation between alkyl chains, yields the conventional herringbone arrangement.
    Original languageEnglish
    JournalChemistry: A European Journal
    Volume6
    Issue number12
    Pages (from-to)2173-2183
    ISSN0947-6539
    DOIs
    Publication statusPublished - 2000

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