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Vapor-phase linker exchange of metal-organic frameworks

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Science Advances  01 May 2020:
Vol. 6, no. 18, eaax7270
DOI: 10.1126/sciadv.aax7270
  • Fig. 1 VPLE of MOFs.

    (A) Schematic of VPLE strategy. Yellow balls and colored sticks represent metal centers and linkers, respectively. (B) Possible hexagonal window structures of ZIF-8 after first and second linker exchanges. The window structures are surrounded by zinc centers and organic linkers. (C) Molecular structures of parent and daughter linkers. IIM, 4-iodoimidazole; BrIM, 4-bromoimidazole; ClBIM, 2-chloromethylbenzimidazole.

  • Fig. 2 Characterizations of ZIF-8 and ZIF-8/I.

    (A) FTIR spectra of ZIF-8 and ZIF-8/I. The characteristic peaks of IIM are marked by asterisks. (B) High-resolution C 1s XPS spectrum of ZIF-8/I. (C) High-resolution I 3d XPS spectra of ZIF-8 and ZIF-8/I. (D) 1H NMR spectra of ZIF-8 and ZIF-8/I. The peaks of IIM and MeIM in ZIF-8/I are marked by triangles and asterisks, respectively. ppm, parts per million. (E) X-ray diffraction (XRD) patterns of ZIF-8 and ZIF-8/I. XRD pattern of simulated ZIF-8 is presented for comparison. (F) Nitrogen adsorption-desorption isotherms and pore size distributions of ZIF-8 and ZIF-8/I. The pore distribution is calculated on the basis of the slit-pore model. (G) Transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and energy dispersion spectroscopy (EDS) mapping images of ZIF-8. (H) TEM, HRTEM, and EDS mapping images of ZIF-8/I.

  • Fig. 3 Versatility of VPLE.

    (A) XRD patterns of ZIF-8, ZIF-8/Cl, ZIF-8/Br, and ZIF-8/I/Cl. The simulated ZIF-8 XRD pattern is presented for comparison. (B) FTIR spectra of ZIF-8, ZIF-8/Cl, ZIF-8/Br, and ZIF-8/I/Cl. (C) TEM and EDS mapping images of ZIF-8/Cl, ZIF-8/Br, and ZIF-8/I/Cl.

  • Fig. 4 Gas adsorption properties of ZIFs.

    (A) Adsorption isotherms of ZIF-8 for CO2, CH4, and N2. STP, standard temperature and pressure. (B) Gas adsorption isotherms of ZIF-8/I. (C) Gas adsorption isotherms of ZIF-8/Cl. (D) Gas adsorption isotherms of ZIF-8/Br. (E) Gas adsorption isotherms of ZIF-8/I/Cl. (F) CO2/N2 and CH4/N2 selectivities of ZIF-8 and linker-exchanged ZIFs.

Supplementary Materials

  • Supplementary Materials

    Vapor-phase linker exchange of metal-organic frameworks

    Wufeng Wu, Jingyi Su, Miaomiao Jia, Zhanjun Li, Guoqiang Liu, Wanbin Li

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