Application of chiral lanthanide-induced shift reagents to optically active cations: the use of tris[3-(trifluoromethylhydroxymethylene)-(+)-camphorato]europium(III) to determine the enantiomeric purity of tris(phenanthroline)ruthenium(II) dichloride
In non-polar solvents, chiral europium complexes provide attractive n. m. r. shift reagents to resolve spectra of optically active cations, and, in particular, for tris(phenanthroline)ruthenium dichloride,1H n. m. r. shift differences of up to 0.7 p.p.m. between isomers easily permit the determination of absolute enantiomeric purity.
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Journal of the Chemical Society, Chemical Communications
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