A conspicuous 27Al-NMR signal at 72&nbsp;ppm during isomerization of Keggin Al13 ions

Brunson, Kieran G.; Colla, Christopher A.; Oliveri, Anna F.; Pan, Long; Casey, William H.

doi:10.1016/j.ica.2020.120014

A conspicuous ²⁷Al-NMR signal at 72 ppm during isomerization of Keggin Al₁₃ ions

Journal Article · Tue Sep 15 00:00:00 EDT 2020 · Inorganica Chimica Acta

DOI:https://doi.org/10.1016/j.ica.2020.120014· OSTI ID:1763936

Brunson, Kieran G. ^[1]; ^[2]; Oliveri, Anna F. ^[3]; Pan, Long ^[4]; Casey, William H. ^[5]

Univ. of California, Davis, CA (United States); Southern Oregon Univ., Ashland, OR (United States); Oregon State Univ., Corvallis, OR (United States)
Univ. of California, Davis, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Southern Oregon Univ., Ashland, OR (United States)
Colgate-Palmolive Co., Piscataway, NJ (United States)
Univ. of California, Davis, CA (United States)

A sharp signal at 72 ppm was recently observed in ²⁷Al-NMR spectra during the isomerization of Keggin-Al₁₃ ions in the presence of calcium and glycine [1]. It has been proposed that this signal corresponds to one of the Keggin isomers. Conversion of the most common ε-isomer of the Keggin series of molecules, having the stoichiometry [AlO₄Al₁₂(OH)₂₄(OH₂)₁₂]⁷⁺, is enhanced by the addition of calcium and glycine [2,3]. Here we show that a 72 ppm signal can also be observed in the absence of calcium or glycine; the magnitude of which depends on aluminum concentration and temperature. Additionally, isomerization of the ε-Keggin-Al₁₃ to the γ-Keggin-Al₁₃ isomer was observed in the absence of calcium and glycine at elevated temperatures after several days. Furthermore, calcium and glycine were previously shown to enhance rates of γ-Keggin-Al₁₃ formation.^2.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States); University of California, Davis, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC52-07NA27344; FG02-05ER15693

OSTI ID:: 1763936

Alternate ID(s):: OSTI ID: 1830787
OSTI ID: 1834422
OSTI ID: 2507073

Report Number(s):: LLNL-JRNL--812157; 1019287

Journal Information:: Inorganica Chimica Acta, Journal Name: Inorganica Chimica Acta Vol. 514; ISSN 0020-1693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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A conspicuous 27Al-NMR signal at 72 ppm during isomerization of Keggin Al13 ions

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References (14)

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A conspicuous ²⁷Al-NMR signal at 72 ppm during isomerization of Keggin Al₁₃ ions