Multinuclear magnetic resonance studies under pressure of gases and in supercritical media employing a novel titanium-sapphire high-pressure cell with pressure sensor

Abstract

A novel titanium–sapphire high-pressure NMR cell equipped with a pressure sensor is presented. It enables the accurate and continuous in situ determination of the pressure in samples under pressure of gases and in supercritical CO2 . The homogeneity over the cell in commercial probes is excellent. The usefulness of this NMR cell is demonstrated in several 17O and 14N experiments in supercritical CO2. Furthermore, 1H NMR with concomitant monitoring of the hydrogen gas consumption during a hydrogenation reaction in solution is treated. Important characteristics are the accuracy combined with simplicity and flexibility of operation. © 1999 John Wiley & Sons, Ltd.