Metal-organic frameworks (MOFs) are coordination polymers, which consist of metal cations and organic units (“linkers”). Aluminum MOFs (Al-MOFs) contain Al atoms and linkers of carboxylic acid anions. Al-MOFs gain prominence due to interesting properties and emerging applications in purification and separation of liquids and gases, catalysis, environmental remediation, drug delivery. Al-MOFs are special among MOFs due to high stability at elevated temperatures, and in liquid and gaseous environments. CAU-10 (Christian-Albrechts-University) is Al-MOF with linkers of dianions of isophthalic acid. Recently, CAU-10 was extensively studied for adsorption and desorption of water in vapor and liquid phase. Its linker is isomeric to that of benchmark Al-MOF MIL-53(Al); however, CAU-10 has received much less attention.<br/>   Aluminum is major construction metal widely used by aerospace and chemical industry, the Air Force, Navy, and Army. Coating aluminum may lead to new functional materials with unusual properties, including stability in aggressive environments.<br/>   We applied the hydrothermal route to <i>in-situ</i> deposit coatings of CAU-10 on metallic aluminum. The deposited amount was analyzed by gravimetric tests, and morphology of coatings was assessed by optical microscopy. The chemical composition and structure were analyzed by powder X-ray diffraction (XRD) and the complementary FTIR spectroscopy. The as-prepared coatings were purified by previously not reported facile method, a brief processing with organic solvent under moderate heating. This is in stark contrast to standard purification protocol of up to 3 days which, in addition, uses toxic dimethyl formamide (DMF) and heating at 100 °C. The stage-wise specimen purification was monitored by XRD for controlled removal of major impurity (isophthalic acid) as precursor of synthesis of CAU-10. Finally, we assessed stability of coated specimens by measuring corrosion rates at acidic to neutral pH in aqueous solutions, including strong inorganic acids and buffers. Al-MOF CAU-10 shows promise as novel material for fabrication of functional coatings.

Coatings of aluminum metal-organic framework CAU-10 on metallic aluminum: Synthesis, composition, purification, and stability to corrosion

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.