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Variation in the metal centres of M-M
paddle-wheel SBU results in the formation of isostructural DUT-49(M) frameworks.
However, the porosity of the framework was found to be different for each of
the structures. While a high and moderate porosity was obtained for DUT-49(Cu)
and DUT-49(Ni), respectively, other members of the series [DUT-49(M); M= Mn,
Fe, Co, Zn, Cd] show very low porosity and shapes of the adsorption isotherms
which is not expected for op phases of these MOFs. Investigation on those MOFs
revealed that those frameworks undergo structural collapse during the solvent
removal at the activation step. Thus, herein, we aimed to study the detailed
structural transformations that are possibly occurring during the removal of
the subcritical fluid from the framework.