Temperature Dependence of Spinmdash;Spin Splitting in the Hindered Rotator CHCl2sngbnd;CF2Cl

摘要

The effective H1sngbnd;F19spin coupling in CHCl2sngbnd;CClF2changes from 5.40 cps at mdash;40deg;C to 5.60 cps at +100deg;C. This variation has been analyzed to obtain the difference in potential energy between the two energetically distinct staggered rotational isomers. The result is that the isomer possessing a plane of symmetry is either 2.0 kcal/mole more stable or 1.8 kcal/mole less stable than the other pair. The consequences of this result for the theory of spinmdash;spin splitting are briefly discussed.