Abstract
1:1 inclusive complexes of a bifunctional cryptand (2B NH 2 :2:1) with La +3, Pr +3, and Eu+3 metal ions were prepared using dry acetonitrile in the presence of triethyl ortho-formate. Upon encryptation, a fairly large decrease large decrease in ultraviolet extinction coefficient and large shifts to lower energy by 40–60 cm −1 in the absorptions due to COC stretching vibrations were recorded. NMR spectra of cryptate complexes carrying paramagnetic lanthanide ions exhibited paramagnetic shifts in all the ligand proton resonances and were recorded over a 40 ppm range, confirming the location of a metal ion resident in the central cavity of molecule.
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