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Review date: July 24, 2003
PNNL-SA-27883

High-Pressure NMR Study of Metal Complexes in Supercritical Fluids

CR Yonker, SL Wallen, and JC Linehan. J. Supercritical Fluids 8:250-254 (1995).

Abstract: Results of high-pressure NMR investigations of subcritical and supercritical fluid solutions of metal complexes in ethylene and CO₂ are presented. To our knowledge, this is the first report of high-pressure NMR studies of metal chelates in supercritical fluids. Examples presented include ¹⁹F, NMR studies of two b-diketone metal chelates dissolved in subcritical CO₂-methanol mixtures and a ¹H NMR study of the (1,5-cyclooctadiene) dimethylplatinum (II) (Pt-COD) complex in supercritical ethylene. High-pressure NMR chemical shifts as a function of density 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.