The crystal structure of perdeuterated methanol hemiammoniate (CD₃OD·0.5ND₃) determined from neutron powder diffraction data at 4.2 and 180 K

The structure of the 2:1 compound in the system methanol–ammonia has been determined from high-resolution neutron powder diffraction; the methyl groups are found to be orientationally ordered at 4.2 K but become disordered at 180 K.