Carbazole sulfonamide-based macrocyclic receptors capable of selective complexation of fluoride ion.

ABSTRACT: Two carbazole sulfonamide-based macrocycles 1 and 2 were facilely synthesized and carefully evaluated for their anion recognition properties. The obtained results revealed that macrocycle 1 with a 1,3-xylyl linker was able to bind fluoride ion more strongly and selectively in acetonitrile medium than its strong competitors (like acetate and dihydrogen phosphate anions), with a large binding constant (K _a) of 50 878 M^-1. More importantly, an exclusive fluoride recognition was achieved for macrocycle 1 in the more polar DMSO-d ₆ solution, albeit with a moderate affinity of K _a = 147 M^-1. Compared with macrocycle 1, macrocycle 2 bearing a 2,6-lutidinyl linkage exhibited a remarkable change not only in the anion affini

SUBMITTER: Luo N 

PROVIDER: S-EPMC8695707 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature