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Interactions between shape-persistent macromolecules as probed by AFM

  • Water-soluble shape-persistent cyclodextrin (CD) polymers with amino-functionalized end groups were prepared starting from diacetylene-modified cyclodextrin monomers by a combined Glaser coupling/click chemistry approach. Structural perfection of the neutral CD polymers and inclusion complex formation with ditopic and monotopic guest molecules were proven by MALDI–TOF and UV–vis measurements. Small-angle neutron and X-ray (SANS/SAXS) scattering experiments confirm the stiffness of the polymer chains with an apparent contour length of about 130 Å. Surface modification of planar silicon wafers as well as AFM tips was realized by covalent bound formation between the terminal amino groups of the CD polymer and a reactive isothiocyanate–silane monolayer. Atomic force measurements of CD polymer decorated surfaces show enhanced supramolecular interaction energies which can be attributed to multiple inclusion complexes based on the rigidity of the polymer backbone and the regular configuration of the CD moieties. Depending on the geometrical configuration of attachment anisotropic adhesion characteristics of the polymer system can be distinguished between a peeling and a shearing mechanism.

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Document Type:Article
Author:Johanna BlassORCiD, Jessica BrunkeORCiD, Franziska Emmerich, Cédrik Przybylski, Vasil M. GaramusORCiD, Artem FeoktystovORCiD, Roland BennewitzORCiD, Gerhard WenzORCiD, Marcel AlbrechtORCiD
Parent Title (English):Beilstein Journal of Organic Chemistry
First Page:938
Last Page:951
Year of first Publication:2017
Release Date:2022/08/30
Tag:AFM; Cyclodextrin; Molecular recognition; Polyconjugated polymers; Shape persistent polmers
Impact:02.330 (2017)
Funding Information:Volkswagen Foundation
Interaktive Oberflächen
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2017/053
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International