1. Weaving of organic threads into a crystalline covalent organic framework
by Yuzhong Liu, Yanhang Ma, Yingbo Zhao, Xixi Sun, Felipe Gándara, Hiroyasu Furukawa, Zheng Liu, Hanyu Zhu, Chenhui Zhu, Kazutomo Suenaga, Peter Oleynikov, Ahmad S. Alshammari, Xiang Zhang, Osamu Terasaki, and Omar M. Yaghi
Science
Volume 351(6271):
January 22, 2016
Published by AAAS

2. Fig. 1 Weaving and entanglement.
Weaving and entanglement. Illustrations of weaving of threads in two (A) and three (B) dimensions, compared with entanglements of sheets (C), 3D arrangements (D), and their interlocking of rings (insets).
Yuzhong Liu et al. Science 2016;351:
Published by AAAS

3. Fig. 2 A general strategy for the design and synthesis of weaving structures.
A general strategy for the design and synthesis of weaving structures. COF-505 was constructed from organic threads using copper(I) as a template (A) to make an extended weaving structure (B), which can be subsequently demetalated and remetalated.
Yuzhong Liu et al. Science 2016;351:
Published by AAAS

4. Fig. 3 Morphology and electron microscopy studies of COF-505.
Morphology and electron microscopy studies of COF-505. (A) Crystallites aggregated on a crystalline sphere observed by SEM. (B) TEM image of a single sub-μm crystal used for 3D-EDT. (C) 2D projection of the reconstructed reciprocal lattice of COF-505 obtained at 298 K from a set of 3D-EDT data. (D) HRTEM image of COF-505 taken with the [1-10] incidence. (E) 2D projected potential map obtained by imposing pgg plane group symmetry on Fig. 1D. (F) Reconstructed 3D electrostatic potential map (threshold, 0.8). (G) Indexed PXRD pattern of the activated sample of COF-505 (black) and the Pawley fitting (red) from the modeled structure.
Yuzhong Liu et al. Science 2016;351:
Published by AAAS

5. Fig. 4 Single-crystal structure of COF-505.
Single-crystal structure of COF-505. The weaving structure of COF-505 consists of chemically identical helices (marked in blue and orange because they are of opposite chirality) with the pitch of 14.2 Å (A). The orange helices propagate in the [1-10] direction, whereas the blue helices propagate in the [110] direction with copper (I) ions as the points of registry (B). Neighboring blue helices are woven with the orange helices to form the overall framework (C). Blue and orange helices and their C2 symmetry-related green and gray copies are mutually woven (D). Additional parallel helices in (C) and (D) are omitted for clarity.
Yuzhong Liu et al. Science 2016;351:
Published by AAAS