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- W2019901606 abstract "Lanthanide cryptate complexes of cryptand 2B: 2:1 were prepared using the medium of acetonitrile containing triethyl-orthoformate. Upon encryptation, a fairly large decrease in the ultraviolet extinction coefficient of the benzo-cryptand is observed. Infrared spectra established the unsolvated nature of the complexes prepared in this study. The coordination of the cryptand's ether oxygens to encapsulated metal ions result in a large shift to lower energy up to 60 cm−1, in the absorptions due to COC stretching vibrations. Proton nmr spectra of the lanthanide(III) cryptate complexes show noticeable differences when compared to the free cryptand spectrum. Along with down field shifts in all the methylene and benzene-ring protons, the aromatic protons in the diamagnetic lanthanum(III) cryptate spectrum are now recorded as A′2B′2 symmetric multiplets. Paramagnetic induced shifts are observed in the nmr spectra of all the paramagnetic lanthanide cryptate complexes. The Pr(III) cryptate spectrum is recorded in the range −23.4–21.4 ppm whereas the whole spectrum for the Eu(III)complex is obtained between −15.0–18.5 ppm." @default.
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- W2019901606 title "Complexes of lanthanide nitrates with the cryptand 2B:2:1" @default.
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- W2019901606 doi "https://doi.org/10.1016/s0020-1693(00)86318-5" @default.
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