NMR and isothermal calorimetric titrations, as well as X-ray structures, show the binding of a nitrate anion inside guanidinium-based macrocycles. All six lone pairs of nitrate are complemented by oriented hydrogen bond donors from a guanidinium and two urea subunits.
P. Blondeau, J. Benet-Buchholz, J. de Mendoza
New J. Chem. 2007, 31, 736-740
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