Selective IR-induced isomerization of 1,2-dichloropropane isolated in xenon matrix

Infrared irradiation of 1,2-dichloropropane isolated in a xenon matrix at 20 K results in selective conformational isomerization from Trans (T) to Gauche+ (G+), while conformer Gauche− (G−) remains intact. Factors responsible for such selectivity are discussed. The graphics shows calculated potential energy profile (red line) of the compound in polar coordinates, as a function of the Cl−C−C−Cl dihedral angle.