Delayed Linker Addition (DLA) Synthesis for Hybrid SOD ZIFs withUnsubstituted Imidazolate Linkers for Propylene/Propane and n-Butane/i-Butane Separations. Academic Article uri icon


  • We present a novel synthesis strategy termed delayed linker addition (DLA) to synthesize hybrid zeolitic-imidazolate frameworks containing unsubstituted imidazolate linkers (Im) with SOD topology (hereafter termed Im/ZIF-8). Im linker incorporation can create larger voids and apertures, which are important properties for gas storage and separation. To date, there have been only a handful of reports of Im linkers incorporated into ZIF-8 frameworks, typically requiring arduous and complicated post synthesis approaches. DLA, as reported here, is a simple one-step synthesis strategy allowing high incorporation of Im linker into the ZIF-8 framework while still retaining its SOD topology. We fabricated mixed-matrix membranes (MMMs) with 6FDA-DAM polymer and Im/ZIF-8 obtained via DLA as a filler. The Im/ZIF-8-containing MMMs showed excellent performance for both propylene/propane and n-butane/i-butane separation, displaying permeability and ideal selectivity well above the polymer upper bound. Moreover, highly detailed molecular simulations shed light to the aperture size and flexibility response of Im/ZIF-8 and its improved diffusivity as compared to ZIF-8.

published proceedings

  • Angew Chem Int Ed Engl

altmetric score

  • 3.05

author list (cited authors)

  • Hillman, F., Hamid, M., Krokidas, P., Moncho, S., Brothers, E. N., Economou, I. G., & Jeong, H.

citation count

  • 8

complete list of authors

  • Hillman, Febrian||Hamid, Mohamad Rezi Abdul||Krokidas, Panagiotis||Moncho, Salvador||Brothers, Edward N||Economou, Ioannis G||Jeong, Hae-Kwon

publication date

  • April 2021