Liquid chromatographic retention behavior of organometallic compounds and ligands with amine-, octadecylsilica- and β-cyclodextrin-bonded phase columns

Abstract

Effects of solvent composition and ligand variation on the retention of organometallic compounds have been studied using an amino, an octadecylsilica (ODS) and a β-cyclodextrin (β-CD) bonded phase column in either a normal-phase or a reversed-phase mode. The retention behavior for the organometallic compounds with the amino column can be rationalized using the displacement model. The “apparent” molecular areas are greater for compounds capable of strong hydrogen bonding. The retention in the ODS column roughly follows an argument based on the expected solubility behavior while mixed retention mechanisms are involved for the β-CD column, i.e. both inclusion process and solubility or solvophobic interactions are possibly operative.