The simulated spectra were generated using the parameters listed in Table and matches the experimentally obtained spectra. These data are in good agreement with those reported in the literature for similar systems. In order to preserve the integrity of the MOF material the redox behaviour of 1 and 2 were investigated in the solid-state by cyclic voltammetry and transmittance mode UV-vis spectroelectrochemistry. Solid-state CV was performed for 1 and 2 by their encapsulation on the surface of a glassy carbon electrode using a LiClO4 intercalated polyvinylchloride (PVC) matrix. For both 1 and 2 CV studies show two reductions, presumably each a one-electron process and PDI based, given the similarity in potentials relative to L 1 . Hence a PDI moiety incorporated into a MOF framework of 1 and 2 retains the ability to form mono-and di-anionic species (Fig. ). It is notable that the first reduction process occurs at slightly less negative potentials in the case of both 1 and 2 indicating that the first reduction is energetically more favourable when the PDI is incorporated into the MOF rather than in the solution phase (Table ). Contrastingly the second reduction occurs at very similar potentials whether in a MOF environment or in the solution phase free ligand. Although naphthalene-diimide (NDI) containing MOFs have been studied by electrochemical and spectroelectrochemical methods the results presented herein are, to our knowledge the first time that PDI-containing MOFs have been studied electrochemically. Indeed studying any MOF by spectroelectrochemical methods remains unusual.