Quantitative relationship and application of 3-benzylketoimine metal dichlorides in the analysis of volatile hydrocarbons.
The paper concerns the analysis of volatile hydrocarbons on newly designed and produced capillary columns. According to the type of coating used, the columns are of the PLOT type, and according to the adsorbate-adsorbent type interactions they belong to the category of complexation GC. The adsorbent used was silica, whose surface was modified with bonded 2-(3-triethoxysilylpropylimino)-3-(benzyl)-pentanone-4 to change the adsorption characteristics. The presence of the ketoimine group of strongly electron-accepting properties permitted the binding of transition metals. The metal ions are capable of interacting selectively with nucleophilic compounds including olefins. The transition metal ions used for sorbent modification were copper(II) chlorides and nickel(II) chlorides. The supported adsorbent was immobilised by bonding the modified silica to the column walls by a film of poly(dimethylsiloxane). Due to this strategy, the coating was very stable, no sorbent loss from the column was observed and the column could be washed with solvent. Besides exemplary separations, the paper quotes retention parameters of the group of compounds analysed and presents a discussion of the specific interactions between the adsorbate and adsorbent.
Wawrzyniak
Rafal
R
Faculty of Chemistry, Adam Mickiewicz University, Poznan, Poland. rafwawrz@amu.edu.pl