Chromatographic Retention of Azaarenes on Florisil

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Abstract
Various substituted pyridines, quinolines, and other azaarenes were applied on Florisil and eluted with ether saturated with ammonia. The relationships between chromatographic retention and aqueous basicity suggested that the mechanism of adsorption involved the exchangeable protons on the surface of Florisil. Thus, retention of azaarenes on Florisil was mainly influenced by the Brönsted basicity of the heterocyclic nitrogen atom(s). In contrast with adsorption on silica and alumina, steric interactions had minimal effects on retention. The results suggested that Florisil might be a good adsorbent for separating azaarenes in environmental and other samples.