A complex of the lanthanide salt, praseodymium nitrate, and the crown ether, 15-crown-5 has been isolated. The characterization of this complex by elemental analysis, melting point, H and C NMR, UV-visible and IR has indicated that the isolable solid compound is a 1:1 stoichiometric complex of the two reactants and is unsolvated. The application of this complex as a lanthanide shift reagent does not appear to be very feasible due to its insolubility in the non-polar solvents typically used in NMR experiments. Studies of the shifting ability of this complex as well as an inves tigation of the shifting ability of other complexes made in this laboratory indicate that they induce chemical shifts that are no different from shifts induced by the lanthanide salt in the absence of the crown ether. All evidence indicates that the complex dissociates in the polar solvents in which it is soluble.
Library of Congress Subject Headings
Chemical tests and reagents; Nuclear magnetic resonance
Department, Program, or Center
School of Chemistry and Materials Science (COS)
DeCann, Dale, "Crown Ether Complexes of Lanthanide Elements and Their Applications as Lanthanide Shift Reagents" (1979). Thesis. Rochester Institute of Technology. Accessed from
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