Angewandte Chemie International Edition
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Back Cover: Molecular Rotors in Porous Organic Frameworks (Angew. Chem. Int. Ed. 4/2014)
Para-phenylene rings in porous aromatic frameworks rapidly flicker, resembling butterflies that flap their wings. In their Communication on page 1043 ff., P. Sozzani et al. demonstrate that these low-density, yet robust covalent architectures can sustain extremely rapid rotational motion of the phenylene rings.