Fig. 4: The origin of origami movement in PPF-301.
From: Origamic metal-organic framework toward mechanical metamaterial
A Definition of folding angle θ1, dihedral angle φ (C–C–O–C), and bond angle α (C–O–C). There are two types of A (φA, αA) and B (φB, αB) pairs in the framework. Zn = yellow; C = gray; N = blue; O = red; all hydrogen atoms and solvent molecules are omitted for clarity. B θ as a function of φ. C Potential energy surface by varying φ and α of the isolated aryloxy group. Gray circles indicate the isolated aryloxy group found in the CSD. D The enlarged figure of the dashed box in Fig. 4. As the temperature increased, the two types of angles increased and became energetically stable. Source data are provided as a Source Data file.
