Superprotonic Conductivity in Metal-Organic Framework via Solvent-Free Coordinative Urea Insertion

Marvin K. Sarango-Ramírez, Dae Woon Lim, Daniil I. Kolokolov, Alexander E. Khudozhitkov, Alexander G. Stepanov, Hiroshi Kitagawa

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Highly stable superprotonic conductivity (>10-2 S cm-1) has been achieved through the unprecedented solvent-free-coordinative urea insertion in MOF-74 [M2(dobdc), M = Ni2+, Mg2+ dobdc = 2,5-dioxido-1,4-benzenedicarboxylate] without an acidic moiety. The urea is bound to open metal sites and alters the void volume and surface functionality, which triggers a significant change in proton conductivity and diffusion mechanism. Solid-state 2H NMR revealed that the high conductivity was attributed to the strengthening of the hydrogen bonds between guest H2O induced by hydrogen bonds in the interface between H2O and the polarized coordinated urea.

Original languageEnglish
Pages (from-to)6861-6865
Number of pages5
JournalJournal of the American Chemical Society
Issue number15
Publication statusPublished - 15 Apr 2020




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