Our proposal is to use neutron total scattering on GEM to study framework flexibility and the phenomenology of the displacive phase transition in the cyanide-containing framework N(CD3)4[CuZn(CN)4]. Cyanides are a useful go-between in translating our understanding of dynamical processes in oxide materials to the world of metal¿organic frameworks. When designing framework materials, there is a strong need to understand not only the structural chemistry of different chemical components but also how different components might impart different mechanical properties. Our study here is aimed at understanding (i) the mechanical differences in Cu- and Zn-based building blocks, (ii) the role of host-guest interactions in affecting ultra-low thermal expansion behaviour, and (iii) the phenomenology of displacive phase transitions in an extended framework material.