Calix[4]pyrroles: C-rim substitution and tunability of anion binding strength
作者:Philip A. Gale、Jonathan L. Sessler、William E. Allen、Nicolai A. Tvermoes、Vincent Lynch
DOI:10.1039/a700685c
日期:——
Electron-rich and electron-deficient C-rim substituted
calix[4]pyrroles 1–4 are synthesised and the anion binding ability
of these receptors is found to be dependent upon the C-rim
substituents.
The preparation of two distinct calix[4]pyrrole-modified silica gels is reported. These systems, designed to investigate the binding characteristics of calix[4]]pyrroles with anionic and neutral substrates, also provide a new solid support for the HPLC separation of nucleotides, oligonucleotides, N-protected amino acids and perfluorinated biphenyls. Binding affinities for the interaction of anions with calix[4]pyrrole amide derivatives are also reported; these were determined from H-1 NMR spectroscopic analyses carried out in CD2Cl2.