Residence times for protons bound to three oxygen sites in the AlO4Al12(OH)24(H2O)127+ polyoxocation

Houston, Jacqueline R.; Phillips, Brian L.; Casey, William H.

doi:10.1016/j.gca.2005.12.007

Cited by 17 publications

(18 citation statements)

References 28 publications

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“…doi:10. 1016/j.gca.2009.02.001 groups, including their exchange dynamics Phillips et al, 2000Phillips et al, , 2003Casey and Phillips, 2001;Lee et al, 2002;Houston et al, 2006;Balogh et al, 2007;Villa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Water ordering and surface relaxations at the hematite (110)–water interface

Catalano¹,

Fenter

Park

2009

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

Water ordering and surface relaxations at the hematite (110)–water interface

Catalano¹,

Fenter

Park

2009

Geochimica et Cosmochimica Acta

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“…ϵ‐Al 13 was synthesized by using a standard method and crystallized with SO 4 2− counterions. Because the sulfate salt of ϵ‐Al 13 is insoluble in aqueous solutions, we extracted the free cation using a metathesis reaction with BaCl 2 . All samples were prepared in D 2 O to provide a lock signal for 1 H NMR spectroscopy.…”

Section: Five Isomers Of the Baker–figgis–keggin Cluster ϵ δ γ βmentioning

confidence: 99%

“…Because the sulfate salt of e-Al 13 is insoluble in aqueous solutions, we extracted the free cation using am etathesis reaction with BaCl 2 . [18] All samples were prepared in D 2 Ot op rovide al ock signal for 1 HNMR spectroscopy.S amples were heated to 90 8Ci na no il bath. Daily they were removed for NMR analysis.…”

mentioning

confidence: 99%

Isomerization of Keggin Al₁₃ Ions Followed by Diffusion Rates

Oliveri

Colla

Perkins

et al. 2016

Chemistry A European J

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The solution chemistry of aluminum has long interested scientists due to its relevance to materials chemistry and geochemistry. The dynamic behavior of large aluminum-oxo-hydroxo clusters, specifically [Al O (OH) (H O) ] (Al ), is the focus of this paper. Al NMR, H NMR, and H DOSY techniques were used to follow the isomerization of the ϵ-Al in the presence of glycine and Ca at 90 °C. Although the conversion of ϵ-Al to new clusters and/or Baker-Figgis-Keggin isomers has been studied previously, new H NMR and H DOSY analyses provided information about the role of glycine, the ligated intermediates, and the mechanism of isomerization. New H NMR data suggest that glycine plays a critical role in the isomerization. Surprisingly, glycine does not bind to Al clusters, which were previously proposed as an intermediate in the isomerization. Additionally, a highly symmetric tetrahedral signal (δ=72 ppm) appeared during the isomerization process, which evidence suggests corresponds to the long-sought α-Al isomer in solution.

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“…Usually the rates of proton exchange, which interconvert the functional groups, is much more rapid than the rate of ligand exchange. (This difference in rates is not always true -rates of proton exchange on large clusters have sometimes approached the rates of ligand exchange (e.g., Houston et al, 2006) but for small ions the rates usually differ by orders of magnitude.) The net effect of rapid interconversion of bound hydroxyls to bound water (and vice versa) is…”

Section: Rapid Interconversion Of Functional Groups By Hydrolysismentioning

confidence: 99%