In the subsequent HAR refinement, positions of hydrogen atoms belonging to the framework structure were refined unrestrained. The resulting C-H bond lengths were in good agreement with the values expected from neutron diffraction. Moreover, the atomic displacement parameters (ADPs) of imidazolate hydrogens were refined anisotropically, in all cases yielding well-defined ellipsoids. Hydrogens within DMF molecules were refined isotropically, with C-H bond lengths restrained to standard neutron value of 1.088 Å.