Pyrrole- and Naphthobipyrrole-Strapped Calix[4]pyrroles as Azide Anion Receptors.

ABSTRACT: The binding interactions between the azide anion (N₃^-) and the strapped calix[4]pyrroles 2 and 3 bearing auxiliary hydrogen bonding donors on the bridging moieties, as well as of normal calix[4]pyrrole 1, were investigated via ¹H NMR spectroscopic and isothermal titration calorimetry analyses. The resulting data revealed that receptors 2 and 3 have significantly higher affinities for the azide anion in organic media as compared with the unfunctionalized calix[4]pyrrole 1 and other azide receptors reported to date. Single crystal X-ray diffraction analyses and calculations using density functional theory revealed that receptor 2 binds CsN₃ in two distinct structural forms. As judged from the metric parameters, in the resulting complexes one limiti

SUBMITTER: Kim SH 

PROVIDER: S-EPMC6276370 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature