Preorganization in bistriazolyl anion receptors

A series of 4,6-bis-(1,2,3-triazolyl)-pyrimidine and 4,6-bis-(1,2,3-triazolyl)-pyridine anion receptors were synthesized and the effect of the pyrimidine and pyridine moieties on their binding properties was examined. We found that intramolecular interactions preorganize the 4,6-bis-(1,2,3-triazolyl)-pyridine receptors resulting in higher anion binding constants in comparison with the nonpreorganized 4,6-bis-(1,2,3-triazolyl)-pyrimidine receptor.