th  - 1988 - 51st ENC Conference

MON Eve 7:301 PRESSURE - AN ESSENTIAL EXPERIMENT~ VARIABLE IN NMR STUDIES OF
THE DYNAMIC BEHAVIOR OF CHEMICAL SYSTEMS: Jiri Jonas , University of Illinois,
Department of Chemistry, Urbana, Illinois. 61801.
An overview of several high pressure NMR studies performed in our laboratory
illustrates the essential role of pressure (density) in the investigation of the
dynamic behavior of chemical systems. After a brief introduction devoted to the
novel experimental high pressure NMR techniques, two projects are discussed.
The two examples deal with the application of multinuclear high resolution N-MR
spectroscopy at high pressure. First, the results of the study (C.-L. Xie, D.
Campbell, J. Jonas, J. Chem. Phys., in press, 1988) of the dynamical solvent effects
on the rotation of coordinated ethylene in ~-CsHsRh(CpHA) p demonstrate the unique
information about the reaction rates in soluti6n-obtaln~d-from the high pressure NMR
experiments. Second, the pressure effects on the main phase transition, ln L-a-
dipalmitoyl phosphatidyl vesicles are investigated by proton decoupled lJc natural
abundance NMR spectroscopy (C.-L. Xie, P. J. Grandinetti, D. Driscoll, A. Jonas,
J. Jonas, PNAS, in press).
The concluding remarks emphasize the wide range of problems that can be studied
by the high pressure NMR techniques.
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