Observation of alumina nanoparticles generated from aqueous solutions of a “flat” aluminum-13 cluster

Rosen, Alex Q.; Salpino, Victor; Johnson, Darren W.

doi:10.1039/d3cc02651e

Chem. Commun.

2023

DOI: 10.1039/d3cc02651e

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Observation of alumina nanoparticles generated from aqueous solutions of a “flat” aluminum-13 cluster

Alex Q. Rosen,

Victor Salpino,

Darren W. Johnson

Abstract: Nanoscale agglomerates of amorphous alumina have been observed after a facile synthesis of a flat-Al13 molecular cluster. Solid and solution state studies were leveraged to investigate these species.

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2024

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Unraveling the Structural Evolution of Aluminum Polyoxocations in Solution

Zhao,

Jiao

et al. 2024

Langmuir

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The primary objective within the realm of aluminum solution chemistry is to elucidate the structural changes in aluminum polyoxocations under the influence of altered solution conditions. Notably, previous reports are primarily focused on specific types, such as aluminum monomers, species from the Keggin series, and the planar Flat-Al13 15+ (F-Al13) cluster. As a result, there is a lack of comprehensive understanding of the remaining aluminum polyoxocations and their respective transformation pathways. In response to this lack, we adopt a combined experimental and theoretical approach to explore the spectral properties of aluminum polyoxocations. Specifically, we analyze infrared spectra, Raman spectra, and aluminum-27 nuclear magnetic resonance (27Al NMR) spectra. Notably, the changes in the spectral features originate from varying solution basicity levels. Through our findings, we can categorize the Al–O clusters into three primary groups: Al(H2O)6 3+ (Al1), ε-Keggin-[AlO4Al12(OH)24(H2O)12]7+ (ε-Al13), and 6-coordinated aluminum species. Notably, the Raman spectra exhibit prominent peak shifts at 559 and 595 cm–1, indicating the existence of Al3(1) intermediates during the transition from the Al monomer to the ε-Al13 cluster. Overall, this paper presents a comprehensive summary of the possible mechanisms that govern the formation of ε-Al13 from Al3(1), offering a clearer picture of the aluminum polyoxocation landscape and its dynamics under various solution conditions.

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Unraveling the Structural Evolution of Aluminum Polyoxocations in Solution

Zhao,

Jiao

et al. 2024

Langmuir

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show abstract

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Observation of alumina nanoparticles generated from aqueous solutions of a “flat” aluminum-13 cluster

Abstract: Nanoscale agglomerates of amorphous alumina have been observed after a facile synthesis of a flat-Al13 molecular cluster. Solid and solution state studies were leveraged to investigate these species.

Cited by 1 publication

References 29 publications

Unraveling the Structural Evolution of Aluminum Polyoxocations in Solution

Unraveling the Structural Evolution of Aluminum Polyoxocations in Solution

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