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  • Author: W. Hauer x
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High Pressure, NMR, NAD +-Model, Activation Volume The activation volume ⊿V* for the rotation of the N -aralkylpyridinium moiety in a synthetic NAD + model was studied by high pressure HRNMR. From the pressure dependence of the proton spectra a negative ⊿V* of -3 cm3 · mol-1 is derived. It is concluded from this result, that the rotation of the N -aralkylpyridinium ring occurs in a complex geared m otion and not in 180°-flips.