Rational design of a functionalized oxacalix[2]arene[2]triazine host for selective recognition of H2PO4− by cooperative anion–π and hydrogen bond interactions

Bis(phenylcarbamoyl)-functionalized tetraoxacalix[2]arene[2]triazine host molecule bearing incorporated hydrogen bonding motifs in the proximity of the anion–π interaction domain was synthesized efficiently. The tailor-made macrocyclic host acts as a multivariate receptor to selectively recognize H2PO4− anion through cooperative anion–π and anion–hydrogen bond interactions.