Synthesis and metal recognition of biscalix[4]arenes. Intramolecular metal-hopping as detected by 1H NMR spectroscopy
摘要:
Ionophoric biscalix[4]aryl esters in which the lower edges confront each other were synthesized. Through the H-1 NMR spectral examination, we found a novel phenomenon that Na+ hops in a H-1 NMR time-scale between the two metal-binding sites.