Abstract
In this paper, are considered optimum conditions of separation and determination of two newly synthesized heptacoordinated benzyl derivatives from the group of ES-silanates: Homo{O,O′,O″,O″′-oxalic acid's Si[N-benzylaminiomethyl]dihydroxysilanate} and Homo{O,O′,O″,O″′-oxalic acid's Si[N-benzylaminiomethyl]diethoxysilanate}. In the investigation an advantage of interactions of π–π type between analyzed compounds and stationary phases were studied. Three stationary phases (phenylbutyl, naphthylpropyl, and Hypercarb, with porous graphitized carbon) and two mobile phases (acetonitrile and dichloromethane) in various intensities of flow were considered. The best selectivity and the highest separation factor (α = 9.69) was obtained using, as the mobile phase acetonitrile (100%) and the Hypercarb column. The phenylbutyl column was characterized by a slightly lower separation factor. Obtained results show that dominating interactions in the chromatographic process are interactions of π–π type. Unfortunately, so far information concerning the chromatography of Hoszczawa-silanates have been not published in the chemical literature.
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