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• W2023110057 abstract "Formation of host–guest complexes with acetic acid and benzoic acid was studied by NMR for amide-based octaazacyclophanes having pendant methyl ester arms; the cyclophanes were tetramethyl 2,9,18,25-tetraoxo-1,4,7,10,17,20,23,26-octaaza[10.10]paracyclophane-4,7,20,23-tetraacetate, its meta-isomer and analogues. Amide NH proton and CH2 proton adjacent to amide C = O in every cyclophane host showed down-field NMR shifts in the presence of the guest acids in CHCl3-d, suggesting the formation of 1:1 complexes in which the carboxyl group of an acid molecule formed two hydrogen bonds with the amide NH and C = O moieties of a host molecule. Since the complex formation competed with the dimerization of the guest acids, the monomer–dimer equilibrium was restudied by NMR and the equilibrium constant was determined to be 330 M− 1 for acetic acid and 518 M− 1 for benzoic acid. By using these values, the formation constants of the host–guest complexes were determined to be 8–51 M− 1. The close contact between the host..." @default.
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• W2023110057 date "2008-03-20" @default.
• W2023110057 modified "2023-09-24" @default.
• W2023110057 title "NMR Studies of Host–guest Complexes Between Monocarboxylic Acids and Amide-based Cyclophanes in Chloroform" @default.
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• W2023110057 doi "https://doi.org/10.1080/10610270701245151" @default.
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