Single-crystal x-ray diffraction structures of covalent organic frameworks
2018; American Association for the Advancement of Science; Volume: 361; Issue: 6397 Linguagem: Inglês
10.1126/science.aat7679
ISSN1095-9203
AutoresTianqiong Ma, Eugene A. Kapustin, Shawn X. Yin, Lin Liang, Zhengyang Zhou, Jing Niu, Li-Hua Li, Yingying Wang, Jie Su, Jian Li, Xiaoge Wang, Wei David Wang, Wei Wang, Junliang Sun, Omar M. Yaghi,
Tópico(s)Luminescence and Fluorescent Materials
ResumoCovalent organic frameworks writ large Covalent organic framework (COF) materials have been difficult to characterize structurally and to exploit because they tend to form powders or amorphous materials. Ma et al. studied a variety of three-dimensional COFs based on imine linkages (see the Perspective by Navarro). They found that the addition of aniline inhibited nucleation and allowed the growth of crystals large enough for single-crystal x-ray diffraction studies. Evans et al. describe a two-step process in which nanoscale seeds of boronate ester–linked two-dimensional COFs can be grown into micrometer-scale single crystals by using a solvent that suppresses the nucleation of additional nanoparticles. Transient absorption spectroscopy revealed superior charge transport in these crystallites compared with that observed in conventional powders. Science , this issue p. 48 , p. 52 ; see also p. 35
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