Frontispiece: Generation of Hierarchical Porosity in Metal–Organic Frameworks by the Modulation of Cation Valence

Metal–Organic Frameworks A reducing vapor treatment converts some CuII nodes in the metal–organic framework (MOF) HKUST-1 into CuI. L. B. Sun et al. show in their Communication on page 10104 ff. that hierarchical pores thus form in the original microporous MOF.