Determination of Interaction Strength between Corrole and Phenol Derivatives in Aqueous Media Using Atomic Force Microscopy

Iwona Szymańska (1) , Eddy Dolusic (2) , Wim Dehaen (3) , Wouter Maes (4) , Takashi Ito (5) , Hanna Jadwiga Radecka (6)

1 Institute of Animal Reproduction and Food Research of Polish Academy of Sciences
2 Department of Chemistry
3 Department of Chemistry
4 Department of Chemistry
5 Department of Chemistry
6 Department of Biosensors in Food

Atomic force microscopy (AFM) was used to measure single interaction forces between corrole (host) and phenol derivatives (guests) in aqueous media. A gold tip was modified with thiol derivatives of corrole via the Au-S covalent bond. Such a tip was used to measure adhesion forces with a planar gold substrate modified with thiol-derivatives of phenol and ortho–nitrophenol in aqueous solutions. The mean force between the corrole and ortho–nitrophenol was higher than that between corrole and phenol, probably reflecting stronger hydrogen bond interaction in the former complex. In the presence of supporting electrolyte (0.1 M K2SO4), the mean force increased, suggesting that electrostatic and π-π interactions play an essential role in the adhesion force. In addition, adhesion force measured at pH 6.0 was larger than that at pH 10, reflecting the electrostatic repulsion at the higher pH. These behaviors are consistent with the potentiometric responses of a liquid membrane based on corrole to phenolic compounds. Also, the values of forces for interaction between corrole – phenol derivatives showed the same tendency as energy calculated for these complexes. The Poisson method was used for the calculation of the single force of the chemical bond between the corrole host and the phenolic guests.

Mots clés: Physical Sciences

Iwona Szymańska, Eddy Dolusic, Wim Dehaen, Wouter Maes, Takashi Ito, et al.. Determination of Interaction Strength between Corrole and Phenol Derivatives in Aqueous Media Using Atomic Force Microscopy. Supramolecular Chemistry, 2009, 21 (07), pp.555-563. ⟨10.1080/10610270802406611⟩. ⟨hal-00520012⟩