The Structure of an Adduct of a Chiral Lanthanide Nuclear Magnetic Resonance Shift Reagent.

摘要

Complexes between trivalent lanthanide ions and optically active beta-diketones have been used to facilitate the determination of enantiomeric purity by NMR methods. Chiral lanthanide complexes were first reported to be useful probes by Whitesides and Lewis. In addition to the well-known lanthanide induced isotropic shifts, the presence of asymmetric centers in the beta-diketonato ligands produces a differential shift between the resonances of equivalent nuclei in an enantiomeric pair. (Author)