Experimental and Theoretical Evaluation of the Stability of True MOF Polymorphs Explains Their Mechanochemical Interconversions

Zamirbek Akimbekov, Athanassios D. Katsenis, G. P. Nagabhushana, Ghada Ayoub, Mihails Arhangelskis, Andrew J. Morris, Tomislav Friščić, Alexandra Navrotsky

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

We provide the first combined experimental and theoretical evaluation of how differences in ligand structure and framework topology affect the relative stabilities of isocompositional (i.e., true polymorph) metal-organic frameworks (MOFs). We used solution calorimetry and periodic DFT calculations to analyze the thermodynamics of two families of topologically distinct polymorphs of zinc zeolitic imidazolate frameworks (ZIFs) based on 2-methyl-and 2-ethylimidazolate linkers, demonstrating a correlation between measured thermodynamic stability and density, and a pronounced effect of the ligand substituent on their stability. The results show that mechanochemical syntheses and transformations of ZIFs are consistent with Ostwald's rule of stages and proceed toward thermodynamically increasingly stable, more dense phases.

Original languageEnglish (US)
Pages (from-to)7952-7957
Number of pages6
JournalJournal of the American Chemical Society
Volume139
Issue number23
DOIs
StatePublished - Jun 14 2017
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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