GAS-CHROMATOGRAPHIC STUDY OF REVERSIBLE ADDUCT FORMATION BETWEEN NUCLEOPHILIC SOLUTES AND STATIONARY PHASES CONTAINING LANTHANIDE BETA-DIKETONATES

Complex formation between fluorinated and methylated beta-diketonates of praseodymium and europium, dissolved in a polydimethylsiloxane stationary phase, and aliphatic alcohols, methyl ketones, methyl ethers and carboxylic acid methyl esters has been studied. Investigations were carried out isothermally in the range 90 to 130-degrees-C. An increase in retention values measured on the complexing stationary phase for the test solutes was the primary observation. Equilibrium constants (K) of adduct formation were determined from retention data. It was established that fluorinated lanthanide beta-diketonates enhance adduct formation more selectively than the corresponding methyl compounds. Decrease in the ionic radii from praseodymium to europium gave rise to increased K values.