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- W1996273695 abstract "The synthesis of a polysiloxane containing chemically bonded chiral metal complex derived from nickel(II) bis[(3-heptafluorobutanoyl)-10-methylene-(1R)-camphorate] (Chirasil-nickel) and its effective immobilization on the inner surface of fused-silica capillaries by thermal treatment is described. As expected, the immobilization properties were found to be dependent on the content of residual reactive SiR groups in the polymer backbone (R = OCH3, H). The immobilized Chirasil-nickel stationary phase was employed for the analytical enantiomer separation of coordinating solutes by high-resolution capillary gas and supercritical fluid chromatography. The increase in the relative retention monitored for racemic test solutes after rinsing the columns indicates a slight increase in the effective complex concentration which does not affect the chiral separation factor α. The temperature limit of analysis was raised to 170–180°C for temperature-programmed runs and to 140–150°C under iso thermal conditions, thus extending the scope of complexation gas chromatography considerably, as demonstrated by various enantiomer separations performed at elevated temperatures. When Chirasil-nickel is immobilized on the inner surface of short, narrow-bore capillaries (50 μm I.D.), it can be employed in complexation supercritical fluid chromatography, combining the high solvation strength of supercritical carbon dioxide with the benefit of low operating temperatures, enhancing enantioselectivity." @default.
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- W1996273695 date "1993-05-01" @default.
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- W1996273695 title "Enantiomer separation by complexation gas and supercritical fluid chromatography on immobilized polysiloxane-bonded nickel(II) bis[(3-heptafluorobutanoyl)-10-methylene-(1R)-camphorate] (Chirasil-nickel)" @default.
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- W1996273695 doi "https://doi.org/10.1016/0021-9673(93)85011-u" @default.
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