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Issue 36, 2010
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Single-molecule force spectroscopy of supramolecular heterodimeric capsules

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Abstract

The specific interaction of a supramolecular binding motif was quantitatively evaluated by dynamic single-molecule force spectroscopy (SMFS) using an atomic force microscope (AFM). The supramolecular capsule forms by two different cavitands stitched together by four hydrogen bonds between carboxylic acid and pyridyl groups. The tetra(carboxyl)cavitand is monofunctionalized at the lower rim with a flexible poly(ethylene glycol) linker and attached to the AFM sensor tip. Single-molecule association experiments are accomplished using a diluted self-assembled monolayer (SAM) of the tetra(pyridyl)cavitand on a gold substrate. The measured single-molecule dissociation forces of the heterodimeric capsule represent the mechanical stability of the supramolecular system and allow a quantitative evaluation of the interaction according to the Bell–Evans model yielding dissociation rate constant koff = (0.14 ± 0.14) s−1, reaction length xβ = (0.56 ± 0.076) nm and an estimated value of ΔG0 = −27 kJ mol−1.

Graphical abstract: Single-molecule force spectroscopy of supramolecular heterodimeric capsules

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Article information


Submitted
15 Apr 2010
Accepted
14 Jun 2010
First published
27 Jul 2010

Phys. Chem. Chem. Phys., 2010,12, 10981-10987
Article type
Paper

Single-molecule force spectroscopy of supramolecular heterodimeric capsules

T. Schröder, T. Geisler, V. Walhorn, B. Schnatwinkel, D. Anselmetti and J. Mattay, Phys. Chem. Chem. Phys., 2010, 12, 10981
DOI: 10.1039/C0CP00227E

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