Abstract
Optimal conditions of chromatographic separation and determination of chosen higher coordinated compounds belonging to a group of ES‐silanates have been elaborated. In the analysis were considered: 5λ‐Si‐[(azepinio)methyl]bis[2‐methyllactic(2−)‐01, 02]silicate and 5λ‐Si‐[(azepinio)methyl]bis[2‐methylglycolic(2‐)‐01, 02]silicate. Investigations were carried out applying three stationary phases (phenylbutyl, naphthylpropyl, and hypercarb), two mobile phases (acetonitrile, dichloromethane) and various flows. The shortest retention times were observed when a hypercarb column containing graphitized coal was used. However, the highest separation factor (α=3.05) was obtained using the naphthylpropyl column and the mobile phase consisting of pure acetonitrile (flow 1 mL · min−1).
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