High-performance liquid chromatography of the coordination isomers of triphenylphosphine-substituted homo- and hetero-bimetallic carbonyl complexes of manganese and rhenium

Abstract

The isocratic normal-phase high-performance liquid chromatography of a series of triphenylphosphine (PPh 3)-substituted homo- and hetero-dinuclear metal carbonyl complexes [MM′ (CO) 10− n (PPh 3) n , where M,M′ = Mn, Re; n = 1,2] is reported. A column packed with silica bonded with phenyl groups was used after preliminary experiments showed that columns packed with conventional silica, and with silica bonded with amion-cyano groups were unsatisfactory for separation. The mobile phases used were hexane-toluene (8:2) and hexane-dichloromethane (90:10). The results suggest that besides the symmetry-imposed polarity of the complexes, the nature of the metal and substituent ligand also determine their retention characteristics.