A new post-synthetic polymerization strategy makes metal-organic frameworks more stable

Metal-organic frameworks are of interest in a number of host-guest applications. However, their weak coordination bonding often leads to instability in aqueous environments, particularly at extreme pH, and hence, is a challenging topic in the field. In this work, a two-step, post-synthetic polymeriz...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2019-05, Vol.1 (17), p.4542-4549
Main Authors: Yang, Shuliang, Peng, Li, Sun, Daniel T, Asgari, Mehrdad, Oveisi, Emad, Trukhina, Olga, Bulut, Safak, Jamali, Abbas, Queen, Wendy L
Format: Article
Language:English
Subjects:
Aqueous environments
Bonding strength
Copper
Dopamine
Hydrophobicity
Magnesium
Metal-organic frameworks
Polymerization
Stability
Thin films
X ray powder diffraction
X-ray diffraction
Zinc
Zirconium
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Summary:Metal-organic frameworks are of interest in a number of host-guest applications. However, their weak coordination bonding often leads to instability in aqueous environments, particularly at extreme pH, and hence, is a challenging topic in the field. In this work, a two-step, post-synthetic polymerization method is used to create a series of highly hydrophobic, stable MOF composites. The MOFs are first coated with thin layers of polydopamine from free-base dopamine under a mild oxygen atmosphere, which then undergoes a Michael addition to covalently graft hydrophobic molecules to the external MOF surface. This easy, mild post-synthetic modification is shown to significantly improve the stability of a number of structurally diverse MOFs including HKUST-1 (Cu), ZIF-67 (Co), ZIF-8 (Zn), UiO-66 (Zr), Cu-TDPAT (Cu), Mg-MOF-74 (Mg) and MIL-100 (Fe) in wet, caustic (acidic and basic) environments as determined by powder X-ray diffraction and surface area measurements. This work develops a new post-synthetic polymerization strategy to make various metal-organic frameworks more stable.
ISSN:2041-6520
2041-6539
DOI:10.1039/c9sc00135b