HIGH-PRESSURE NMR-STUDY OF METAL-COMPLEXES IN SUPERCRITICAL FLUIDS

Results of high-pressure NMR investigations of subcritical and supercr itical-fluid solutions of metal complexes in ethylene and CO2 are pres ented. To our knowledge, this is the first report of high-pressure NMR studies of metal chelates in supercritical fluids. Examples presented include F-19 NMR studies of two beta-diketone metal chelates dissolve d in subcritical CO2-methanol mixtures and a H-1 NMR study of the (1,5 -cyclooctadiene) dimethylplatinum (II) (Pt-COD) complex in supercritic al ethylene. High-pressure NMR chemical shifts as a function of densit y for supercritical ethylene are also presented. The results show the utility of the NMR technique to study a variety of metal complexes in subcritical and supercritical fluids.