Table : Interatomic distances (Zn-N and Zn-Zn) of the ReaxFF ZIF-4 glass compared to ab initio and experimental values. Experimental data is obtained from X-ray diffraction (XRD) studies and NMR (Nuclear magnetic resonance) for the crystal, and from a Reverse Monte Carlo (RMC) refinement of Neutron and X-ray scattering data of a melt-quenched glass. Yet, the most stringent distinctive feature of the ReaxFF glass compared to its ab initio counterpart lies in the N-Zn-N bond angle distribution P (θ), shown on Figure . From the Zn(Im) 4 tetrahedral structure, we expect a unimodal distribution around 109 • for the crystal.