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BIBTEX RIS

Superacidity in Sulfated Metal–Organic Framework-808

2014; American Chemical Society; Volume: 136; Issue: 37 Linguagem: Inglês

10.1021/ja507119n

ISSN

1943-2984

Autores

Juncong Jiang, Felipe Gándara, Yue‐Biao Zhang, Kyungsu Na, Omar M. Yaghi, W. G. Klemperer,

Tópico(s)

Zeolite Catalysis and Synthesis

Resumo

Superacids, defined as acids with a Hammett acidity function H0 ≤ -12, are useful materials, but a need exists for new, designable solid state systems. Here, we report superacidity in a sulfated metal-organic framework (MOF) obtained by treating the microcrystalline form of MOF-808 [MOF-808-P: Zr6O5(OH)3(BTC)2(HCOO)5(H2O)2, BTC = 1,3,5-benzenetricarboxylate] with aqueous sulfuric acid to generate its sulfated analogue, MOF-808-2.5SO4 [Zr6O5(OH)3(BTC)2(SO4)2.5(H2O)2.5]. This material has a Hammett acidity function H0 ≤ -14.5 and is thus identified as a superacid, providing the first evidence for superacidity in MOFs. The superacidity is attributed to the presence of zirconium-bound sulfate groups structurally characterized using single-crystal X-ray diffraction analysis.

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