The Recognition of Viologen Derivatives in Water by N-Alkyl Ammonium Resorcinarene Chlorides
Beyeh, N. K., Jo, H. H., Kolesnichenko, I., Pan, F., Kalenius, E., Anslyn, E. V., . . . , & Rissanen, K. (2017). The Recognition of Viologen Derivatives in Water by N-Alkyl Ammonium Resorcinarene Chlorides. Journal of Organic Chemistry, 82 (10), 5198-5203. doi:10.1021/acs.joc.7b00449
Julkaistu sarjassaJournal of Organic Chemistry
© 2017 American Chemical Society. This is a final draft version of an article whose final and definitive form has been published by ACS. Published in this repository with the kind permission of the publisher.
Three water-soluble N-alkyl ammonium resorcinarene chlorides decorated with terminal hydroxyl groups at the lower rims were synthesized and characterized. The receptors were decorated at the upper rim with either terminal hydroxyl, rigid cyclohexyl, or flexible benzyl groups. The binding affinities of these receptors toward three viologen derivatives, two of which possess an acetylmethyl group attached to one of the pyridine nitrogens, in water were investigated via 1H NMR spectroscopy, fluorescence spectroscopy, and isothermal titration calorimetry (ITC). ITC quantification of the binding process gave association constants of up to 103 M–1. Analyses reveal a spontaneous binding process which are all exothermic and are both enthalpy and entropy driven.