J. Sato et al., Resolution of enantiomer signals by diamagnetic lanthanum(III)-N,N,N ' N '-tetrakis (2-pyridinylmethyl)-(R)-propylenediamine complex in H-1 NMR, ENANTIOMER, 4(2), 1999, pp. 147-150
A La(III) complex, La-(R)-tppn (tppn=N,N,N,N'-tetrakis(2-pyridinylmethyl)-(
X)-propylendiamine), is reported for the first time to resolve the enantiom
er signals of alpha-amino acids in weakly acidic solution as a diamagnetic
lanthanide complex. The induced signal separation showed good correspondenc
e between the relative position of the enantiomer signals and the absolute
configuration of alpha-amino acids.