Studies on inclusion complexes of calix[4]arenes capped by diamide bridges with small organic molecules.
The inclusion of small neutral organic guests (acetonitrile, toluene, pyrazine, butylamine, nitromethane) by cyclic calix[4]arene diamide receptors was studied by (1)H NMR spectroscopy. The binding constants determined by (1)H NMR titration, and the results obtained by T(1) relaxation measurements and DOSY confirm the importance of the acidity of the C-H bond of the guests and highlight the role of steric interactions including conformational properties of the receptors in the recognition process.
Balázs
Barbara
B
Technical Analytical Research Group of the Hungarian Academy of Sciences, Budapest University of Technology and Economics, H-1521 Budapest, Hungary.
Grün
Alajos
A
Bitter
István
I
Tóth
Gábor
G