Trans–cis kinetic study of azobenzene-4,4′-dicarboxylic acid and aluminium and zirconium based azobenzene-4,4′-dicarboxylate MOFs

dc.contributor.authorMogale, Refilwe
dc.contributor.authorConradie, Jeanet
dc.contributor.authorLangner, Ernst H. G.
dc.date.accessioned2022-04-25T13:08:22Z
dc.date.available2022-04-25T13:08:22Z
dc.date.issued2022
dc.description.abstractMetal organic frameworks (MOFs) are porous hybrid crystalline materials that consist of organic linkers coordinated to metal centres. The trans–cis isomerisation kinetics of the azobenzene-4,4′-dicarboxylic acid (AZB(COOH)2) precursor, as well as the Al3+ (Al-AZB)- and Zr4+ (Zr-AZB)-based MOFs with azobenzene-4,4′-dicarboxylate linkers, are presented. The photo-isomerization in the MOFs originates from singly bound azobenzene moieties on the surface of the MOF. The type of solvent used had a slight effect on the rate of isomerization and half-life, while the band gap energies were not significantly affected by the solvents. Photo-responsive MOFs can be classified as smart materials with possible applications in sensing, drug delivery, magnetism, and molecular recognition. In this study, the MOFs were applied in the dye adsorption of congo red (CR) in contaminated water. For both MOFs, the UV-irradiated cis isomer exhibited a slightly higher CR uptake than the ambient-light exposed trans isomer. Al-AZB displayed a dye adsorption capacity of over 95% for both the UV-irradiated and ambient light samples. The ambient light exposed Zr-AZB, and the UV irradiated Zr-AZB had 39.1% and 44.6% dye removal, respectively.en_ZA
dc.description.versionPublisher's versionen_ZA
dc.identifierhttps://doi.org/10.3390/molecules27041370
dc.identifier.citationMogale, R., Conradie, J., & Langner, E.H.G. (2022). Trans–cis kinetic study of azobenzene-4,4′-dicarboxylic acid and aluminium and zirconium based azobenzene-4,4′-dicarboxylate MOFs. Molecules, 27, 1370. https://doi.org/10.3390/molecules27041370en_ZA
dc.identifier.issn1420-3049 (online)
dc.identifier.urihttp://hdl.handle.net/11660/11578
dc.language.isoenen_ZA
dc.publisherMDPIen_ZA
dc.rights.holderAuthor(s)en_ZA
dc.rights.licensehttps://creativecommons.org/licenses/by/4.0/
dc.subjectTrans-cis kineticsen_ZA
dc.subjectMetal organic frameworksen_ZA
dc.subjectPhoto-responsiveen_ZA
dc.subjectDye removalen_ZA
dc.subjectChemical kinetics in metal complexesen_ZA
dc.titleTrans–cis kinetic study of azobenzene-4,4′-dicarboxylic acid and aluminium and zirconium based azobenzene-4,4′-dicarboxylate MOFsen_ZA
dc.typeArticleen_ZA
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