This proposal will use Inelastic Neutron Scattering (INS) spectroscopy at TOSCA to establish the vibrational frequencies in nanoporous zeolitic imidazolate framework (ZIF) materials. The objectives include:- (i) to examine the detailed vibrational spectra of five unique ZIF materials which feature distinct chemical structure, network topology, and pore configuration; (ii) to determine framework dynamical behaviour in the spectral range of ca. 100-500 cm-1, where the most interesting Zn-N stretch and bend modes have been projected, but not yet experimentally confirmed; (iii) to uncover the sources of collective vibrations and lattice modes below 100-1; (iv) to elucidate the evolution in ZIF¿s lattice dynamics at high temperature that causes elastic instability; and (v) to understand the physics driving the ¿gate-opening¿ phenomenon in ZIF 4.