SEPARATION PROPERTIES OF BIS(BETA-DIKETONATO)-COPPER(II) COMPLEXES INCAPILLARY GAS-CHROMATOGRAPHY

The xybiphenyl-4-yl)-3-(1'-methylpropyl)-1,3-dionato]- and -4-yl)-3-(1 '-methylpropyl)-1,3-dionato]-copper(II) complexes were synthesized and successfully coated onto a fused-silica capillary column. The results obtained from differential scanning calorimetry and the melting point apparatus equipped with a polarization microscopy showed that they pr esent a nematic phase and have a very limited liquid crystalline tempe rature range under cooling conditions. The chromatographic experiments show that these metal complexes possess good separation abilities for many different kinds of di- and tri-substituted benzene isomers, poly cyclic aromatic hydrocarbons and constituents of volatile oils. In ord er to illustrate the influence of the presence of copper in the molecu les of the stationary phase, the selectivities of 1,3-diones were comp ared with their corresponding bis(beta-diketonato)-copper(II) complexe s. (C) 1998 Elsevier Science B.V. All rights reserved.