Transition metal complex stationary phases for the CGC analysis of ethers, thioethers and ketones |
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Authors: | R Wawrzyniak W Wasiak |
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Institution: | (1) Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland |
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Abstract: | Summary The use of polysiloxanes with cyano or thiol groups as stationary phases for complexation gas chromatography is discussed.
The polymers were obtained via polycondensation followed by polymerisation of the corresponding dichloro- or dimethoxy-silanes.
Both the phases were modified by bonding transition metal chlorides with were modified by bonding transition metal chlorides
with cyano (CuCl2 or CoCl2) and thiol groups (NiCl2 or CoCl2). The phases were examined in order to determine their application to the analysis of ethers, thioethers and ketones. Due
to the presence of lone electron pairs on oxygen or sulphur atoms, the compounds should be capable of specific interacting
with the electron-withdrawing centre of the liquid stationary phases. A number of retention parameters (retention indices,
molecular retention indices and specific retention volume) were determined, which allowed characterisation of specific interactions
between the bonded metal and the compound analysed. The results also enabled assessment of the influence of the structure
of the compounds on their retention. The measurements were also carried out for the phases with free SH and CN groups as reference
phases. The work demonstrates that the phases obtained may be useful for effective separations. |
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Keywords: | Gas chromatography Complexation stationary phases Bonding metal complexes Capillary columns |
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