POROUS GRAPHITIC CARBON (PGC) HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY OF DIPHOSPHINE-BRIDGED COMPLEXES WITH HETERONUCLEAR AU-M (M=MN, RE) BONDS

The isocratic high-performance liquid chromatography of 1,1'-bis(diphe nylphosphino)ferrocene (dppf), 1,1'-bis(diphenylphosphino)ruthenocene (dppr), bis(diphenylphosphino)methane (dppm) and triphenylphosphine (P Ph3)-substituted heterometallic Au-Mn or Au-Re carbonyl complexes is r eported. A column packed with PGC (porous graphitic carbon) was used a fter preliminary experiments had shown that silica- and bonded-phase ( silica-based) stationary phases were unsatisfactory for separation. Th e PGC column exhibited unique selectivity for the complexes studied. T he mobile phases used were water-acetonitrile, dichloromethane-hexane and tetrahydrofuran-hexane. The retention behaviour of the compounds w as governed by the polar character and size of molecules, and influenc ed by metal-metal bond polarity. Separation of isomorphous structures with different metallocenyl moieties was achieved.