Ditopic CMPO-pillar[5] arenes as unique receptors for efficient separation of americium(III) and europium(III)

A unique host-guest recognition process involving a new class of homoditopic CMPO-pillar[5] arenes and lanthanides was revealed to proceed in a stepwise manner, and correlated with the efficient separation of americium(III) and europium(III) under acidic feed conditions.