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The guanidinium functional group is commonly used in nature to recognize and bind anions through ion pairing and hydrogen bonding. Specific hydrogen-bonding patterns can be found in crystal structures of simple guanidinium salts. Analysis of these simple salts reveals a variety of features which are found in natural systems. These features have been applied to a series of artificial phosphodiesterases...
Hydrogen bonding is an important driving force for molecular recognition. Herein, the advantages of developing rigid polyaza-clefts for hydrogen-bond-driven molecular recognition are discussed.
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