Abstract
In high-performance liquid chromatography, the reversed-phase mode column is used most popularly. In the reversed-phase mode separation, several interactions between the stationary phase and analytes are concerned, i.e., partitioning, adsorption, hydrogen bonding, and π-π interactions. In this paper, a π-π interaction effect on high performance liquid chromatographic separation was studied using some N-substituted aminopropyl modified silyl silica gel stationary phases bearing aromatic moieties in their structures. A series of aromatic polycyclic hydrocarbons, i.e., benzene, naphthalene, phenanthrene, and naphthacene, were retained and separated on those columns in the order of their aromaticities, while no retention was observed by the non-substituted aminopropyl modified silyl silica gel column. These results strongly supported the existence of π-π interactions between N-substituted aminopropyl modified silyl silica gel and the hydrocarbons.
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