Internal dynamics in halogen bonded adducts was studied by microwave spectroscopy of chlorotrifluoromethane – formaldehyde complex.
The interesting chemical aspect of this complex is that the two constituting molecules are held together by a halogen bond. The interesting spectroscopic aspects are the features of two large amplitude motions occurring in the complex: the almost free internal rotation of the CF3 top and the low barrier to internal of CH2O.
All this work was published Chemistry A – European Journal.