A Flexible Interpenetrated Zirconium-Based Metal–Organic Framework with High Affinity toward Ammonia

Yuanyuan Zhang, Xuan Zhang, Zhijie Chen, Ken ichi Otake, Gregory W. Peterson, Yongwei Chen, Xingjie Wang, Louis R. Redfern, Subhadip Goswami, Peng Li, Timur Islamoglu, Bo Wang, Omar K. Farha*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Flexible metal–organic frameworks (MOFs) are highly attractive porous crystalline materials presenting structural changes when exposed to external stimuli, the mechanism of which is often difficult to glean, owing to their complex and dynamic nature. Herein, a flexible interpenetrated Zr-MOF, NU-1401, composed of rare 4-connected Zr6 nodes and tetratopic naphthalenediimide (NDI)-based carboxylate linkers, was designed. The intra-framework pore opening deformation and inter-framework motions, when subjected to different solvent molecules, were investigated by single-crystal XRD. The distance and overlap angle between the stacked NDI pairs in the entangled structure could be finely tuned, and the interactions between NDI and solvent molecules led to solvochromism. Furthermore, the presence of electron-deficient NDI units in the linker and acid sites on the node of the interpenetrated porous structure offered high density of adsorption sites for ammonia molecules, resulting in high uptake at low pressures.

Original languageEnglish (US)
Pages (from-to)1710-1714
Number of pages5
Issue number7
StatePublished - Apr 7 2020


  • ammonia capture
  • flexible MOF
  • interpenetrated structure
  • metal–organic frameworks
  • microporous materials

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Energy
  • General Materials Science
  • Environmental Chemistry


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