: A novel isopthalamide based receptor H2L2 featuring two p-benzoic acid units has been synthesised and its anion binding properties analysed by 1H-NMR spectroscopy in DMSO-d6/0.5 % H2O. As expected, in the presence of tetrabutylammonium (TBA) fluoride the deprotonation of the carboxylic acid moieties was observed. However, the deprotonated receptor L22- was able to bind the in situ formed HF2 - via the formation of H-bonds with the amide NHs. When H2L2 was dissolved in THF and 4 equivalents of TBAF were added in CH3CN a unique sol-gel transition occurred giving rise to a stable thixotropic supramolecular gel. Theoretical calculations elucidated the gelation mechanism and strongly support the findings observed experimentally.

A Unique Case of ′in Situ’ Bifluoride Triggered Formation of Supramolecular Organogels Using Isophthalamide Hydrogen Bond Donating Receptors

Montis, Riccardo;
2025

Abstract

: A novel isopthalamide based receptor H2L2 featuring two p-benzoic acid units has been synthesised and its anion binding properties analysed by 1H-NMR spectroscopy in DMSO-d6/0.5 % H2O. As expected, in the presence of tetrabutylammonium (TBA) fluoride the deprotonation of the carboxylic acid moieties was observed. However, the deprotonated receptor L22- was able to bind the in situ formed HF2 - via the formation of H-bonds with the amide NHs. When H2L2 was dissolved in THF and 4 equivalents of TBAF were added in CH3CN a unique sol-gel transition occurred giving rise to a stable thixotropic supramolecular gel. Theoretical calculations elucidated the gelation mechanism and strongly support the findings observed experimentally.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2750591
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