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Structural models of Hf-MOF and Zr-MOF. Structures viewed from the (a) [100] and (b) [110] directions. (c) Ball–stick model of M6(μ3-O)4(μ3-OH)4(carboxylate)12 (M = Hf or Zr) SBU. (d) Tetrahedral and (e) Octahedral cavities. Blue polyhedra: Hf4+ or Zr4+ with eight coordinating oxygen atoms; red ball: oxygen; gray ball: carbon; white ball: hydrogen.
