Solvent Effects on the Internal Rotation Barrier around the C–N Bond and 14N NMR Shielding of 2-Amino-3-Mercapto Propionamide: Continuous Set of Gauge Transformation Calculations using a Polarisable Continuum Model

Abstract

Solvent effects on rotational barriers of 2-amino-3-mercapto-propionamide, an amide derived from cysteine, have been investigated at HF and MP2 levels of theory using a polarisable continuum model (PCM) of solvent. The predicted barrier in the gas phase increases by increasing the polarity of solvents. It was shown that the observed solvent-induced shielding variation is more strongly related to the intensity of the solvent reaction field rather than to the change of molecular geometry induced by the solvent.