Determination of interaction strength between corrole and phenol derivatives in aqueous media using atomic force microscopy

Autor:	Takashi Ito, Wouter Maes, Iwona Szymańska, Hanna Radecka, Eduard Dolusic, Wim Dehaen
Přispěvatelé:	Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Department of Chemistry, Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Kansas State University, Department of Biosensors in Food, Polska Akademia Nauk = Polish Academy of Sciences (PAN)
Rok vydání:	2009
Předmět:	atomic force microscopy Aqueous solution Supporting electrolyte Hydrogen bond Self-assembled monolayer 02 engineering and technology General Chemistry Adhesion 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound aqueous media Molecular recognition corrole chemistry phenol derivatives Covalent bond Physical Sciences Organic chemistry molecular recognition Corrole 0210 nano-technology
Zdroj:	Supramolecular Chemistry Supramolecular Chemistry, Taylor & Francis: STM, Behavioural Science and Public Health Titles, 2009, 21 (07), pp.555-563. ⟨10.1080/10610270802406611⟩
ISSN:	1029-0478 1061-0278
DOI:	10.1080/10610270802406611
Popis:	International audience; 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.
Databáze:	OpenAIRE
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