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Instruments / Technical Area	Publication Details	Published	Actions
I11-High Resolution Powder Diffraction I12-JEEP: Joint Engineering, Environmental and Processing I15-Extreme Conditions	Metal–organic nanosheets formed via defect–mediated transformation of a hafnium metal–organic framework Matthew J. Cliffe , Elizabeth Castillo-Martinez , Yue Wu , Jeongjae Lee , Alexander C. Forse , Francesca C. N. Firth , Peyman Z. Moghadam , David Fairen-Jimenez , Michael W. Gaultois , Joshua A. Hill , Oxana V. Magdysyuk , Ben Slater , Andrew L. Goodwin , Clare P. Grey Journal Of The American Chemical Society DOI: 10.1021/jacs.7b00106 Diamond Proposal Number(s): [9940, 15118, 12554, 13681, 13843] Open Access Show Abstract ▼ Abstract: We report a hafnium containing MOF, hcp UiO-67(Hf), which is a defective layered analogue of the face-centered cubic fcu UiO-67(Hf). hcp UiO-67 accommodates its low- ered ligand:metal ratio compared to fcu UiO-67 through a new structural mechanism: the formation of a condensed ‘double cluster’, analogous to the condensation of coor- dination polyhedra in oxide frameworks. In oxide frameworks variable stoichiometry can lead to more complex defect structures, e.g. crystallographic shear planes or mod- ules with differing compositions, which can be the source of further chemical reactivity; likewise the layered hcp UiO-67 can react further to form two-dimensional nanosheets. Delamination of hcp UiO-67 occurs through the cleavage of strong hafnium-carboxylate bonds and is effected under mild conditions suggesting that defect ordered MOFs could be a productive route to porous two-dimensional materials.	Mar 2017

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