Large Oligocyclic Cavities for Strong Cation Complexation

Article abstract of DOI:10.1016/S0040-4020(01)87606-7

The syntheses of oligocyclic large cavities containing two or three catechol subunits are described.The X-ray analysis of a heptacyclic molecule composed of three triply clamped dimethyl catechol ether units demonstrates the size and shape of the cavity formed by this skeleton.Properties of the Fe(3+)- and Ga(3+)-complexes are elucidated by (1)H-NMR, IR, UV/Vis spectra, and by competition experiments with an open-chained reference ligand.