Adsorption Properties of a Silicagel Surface with Grafted Transition Metal Acetylacetonate Complexes

Abstract

The adsorption properties of a Silipore 200 surface and chemically modified sorption materials containing nickel, cobalt, and copper acetylacetonates are studied via gas chromatography. n-Alkanes (C₆–C₉) and adsorbates, the molecules of which have different electron-donating and electron-acceptor properties, are used as test compounds. From experimental data on the retention of adsorbates; their differential molar adsorption heats ${\overline{q}}_{dif,1}$; changes in standard differential molar entropy $\mathrm{\Delta }{\overline{S}}_{1,C}^S$; and, for polar adsorbates, contributions $\mathrm{\Delta }{\overline{q}}_{dif,1(specific)}$ to the energy of dispersive and specific interactions, are calculated. The effect the metal ion in the structure of acetylacetonate has on the characteristics of thermodynamic retention is shown.