A pair of diastereomeric salen cavitands and their uranyl complexes combine a chiral (R,R) salen bridge and an inherent chiral tris-bridged quinoxaline cup within the same molecule. Whereas the free ligands show a preference for the same enantiomer of an α-amino acid pair, the corresponding UO2 complexes display opposite enantiodiscrimination and exceptionally high enantioselectivities (KD/KL = 26.
A pair of diastereomeric salen cavitands and their uranyl complexes combine a chiral (R,R) salen bridge and an inherent chiral tris-bridged quinoxaline cup within the same molecule. Whereas the free ligands show a preference for the same enantiomer of an α-amino acid pair, the corresponding UO2 complexes display opposite enantiodiscrimination and exceptionally high enantioselectivities (KD/KL = 26.4)
Pair of Diastereomeric Uranyl Salen Cavitands Displaying Opposite Enantiodiscrimination of α‑Amino Acid Ammonium Salts
PAPPALARDO, ANDREA;AMATO, Maria Emanuela;BALLISTRERI, Francesco Paolo;TOMASELLI, Gaetano;TOSCANO, Rosa Maria;TRUSSO SFRAZZETTO, GIUSEPPE
2012-01-01
Abstract
A pair of diastereomeric salen cavitands and their uranyl complexes combine a chiral (R,R) salen bridge and an inherent chiral tris-bridged quinoxaline cup within the same molecule. Whereas the free ligands show a preference for the same enantiomer of an α-amino acid pair, the corresponding UO2 complexes display opposite enantiodiscrimination and exceptionally high enantioselectivities (KD/KL = 26.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
