SEPARATION OF LANTHANIDE BETA-DIKETONATES VIA ORGANOPHOSPHORUS ADDUCTFORMATION BY SUPERCRITICAL-FLUID CHROMATOGRAPHY

This paper describes a novel method for separation and detection of la nthanide beta-diketonates by adduct formation/supercritical fluid chro matography (SFC) with an open-tubular capillary column and a FID detec tor. Separation of lanthanide beta-diketonates cannot be achieved by S FC due to the hydration of the complexes, which cannot be achieved by SFC due to the hydratin of the complexes, which exhibit strong intermo lecular interactions and decomposition in the system. Formation of add ucts of lanthanide beta-diketonates with a neutral donor, tributylphos phine oxide (TBPO) or trioctylphosphine oxide (TOPO), alters their SFC behavior. The adduct formation approach leads to the first successful separation of lanthanide complexes of the same beta-diketone ligand b y SFC using neat CO(2)as the mobile phase.