Complexation of two macrocycles for amide, saccharide, and halide derivatives: the capacity of 1,2,3-triazole as hydrogen and halogen bonding acceptors.

Abstract: Two 1,2,3-triazole- and amide-incorporated macrocycles have been prepared by 1,3-dipolar cycloaddition of the corresponding dialkyne and diazide precursors. Intramolecular C–H⋯O hydrogen bonding is introduced to lock the C5–H atoms of the 1,2,3-triazole rings. The binding of the two macrocycles to amide, monosaccharide, and halide derivatives in chloroform or dichloromethane has been investigated. It is revealed that the amide units dominate their binding toward the amide and monosaccharide guests through forming intermolecular hydrogen bonding and 1,2,3-triazole is as weak as an intermolecular hydrogen bonding acceptor, but it forms intermolecular halogen bonding when cooperative effect exists. [Copyright &y& Elsevier]