ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Separation of alicyclic and aromatic hydrocarbons on a PLOT column coated with 3-benzylketoiminepropyl group
Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
Abstract: An interpretation of specific electron-donor-acceptor interactions between the adsorbent coating the walls of a capillary
column and adsorbates from the groups of alicyclic and aromatic hydrocarbons is proposed. The adsorbent was based on silica
the surface of which was modified with silane containing 3-benzylketoimine groups to improve its adsorption properties. The
columns studied had walls coated with 3-benzylketoimine groups, and Cu(II) chloride complexes or with Ni(II) chloride complexes.
The adsorbate-adsorbent interactions were interpreted on the basis of the Kovats retention index, specific retention volume,
molecular retention index, and ΔM
e values. The influence of particular elements of spatial structure and the positions of double bonds in the adsorbate molecule
was evaluated on the modelling calculations based on the quantitative structure-retention relationships. The introduction
of transition metal ions in the form of complexes into the adsorbents studied increased the strength of the interactions between
the adsorption layer of the capillary column and the adsorbate molecules. The increased strength of the interactions was accompanied
by increased selectivity of the columns with regard to a group of alicyclic and aromatic hydrocarbons. The analytical performance
of the columns thus obtained was compared with that of a commercial column coated with the 100 % dimethyl polysiloxane phase.
Keywords: PLOT column – complexation gas chromatography – QSRR – copper(II) chloride – nickel(II) chloride – alicyclic – aromatic
Full paper is available at www.springerlink.com.
Chemical Papers 66 (7) 626–635 (2012)
Sunday, September 22, 2019