On the Crystal Structure of a Basic Aluminium Sulfate and the Corresponding Selenate.

Johansson, Georg; Lundgren, Georg; Sillén, Lars Gunnar; Söderquist, Rune

doi:10.3891/acta.chem.scand.14-0769

Cited by 176 publications

(106 citation statements)

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“…Although some uncertainties remain concerning the structure of these polymers, they appear to be characterized by a high degree of hydrolysis (OH/A1 = 2.0, 2.4) and by the presence of A1 in four-fold coordination. Note that if this polymeric A1 is represented by the A1~3 polymer of Johansson et al (1960), its size is consistent with the d-values of the pillared clays.…”

Section: Investigation Of the Hydroxy-al Solutionsmentioning

confidence: 65%

“…To take into account this fact, Akitt et al (1972) and Bottero et al (1980) proposed the structure of the crystalline aluminum hydroxy-sulfate described by Johansson et al (1960) Hsu (1977).…”

Section: Investigation Of the Hydroxy-al Solutionsmentioning

confidence: 99%

“…Several authors (Vaughan and Lussier, 1980;Vaughan et aL, 1981;Pinnavaia et al, 1984) postulated that the pillaring species was similar to the [Al~3Oa(OH)24(H20)12] 7+ polymer described by Johansson et al (1960). The following indirect arguments were invoked to support this view: (1) this polymer was the only one known to contain A1 in four-fold coordination; (2) its size is consistent with the d values observed for smectites pillared using hydroxy-aluminum solutions; and (3) the presence in A1-OH solutions of an A1 species containing AP v was evidenced by 27A1 nuclear magnetic resonance (NMR) spectroscopy and ascribed by Bottero et al (1980) to the mlt3 polymer, supporting the previous suggestion of Rausch and Bale Section de Physico-Chimie Minrrale (MRAC), Place Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Schutz

Stone

Poncelet

et al. 1987

Clays and clay miner.

147

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Abstract--Beidellite was synthesized hydrothermally from a noncrystalline gel at 320~ and 130 bar pressure. The beidellitic character of the product was verified by infrared spectroscopy on the NH4 § exchanged form. Intercalation was achieved with hydroxy-aluminum solutions having different OH/A1 molar ratios. The solutions were investigated by several methods, including 27A1 nuclear magnetic resonance. Essentially, two Al species were detected: monomeric A1 and a polymerized form containing A1 in four-fold coordination. This latter species was found to be selectively fixed in the interlamellar region, which resulted in a stable spacing of 18 ,~ at 110~ and 16.2 ~ at 700~ The pillared beidellites had specific surface areas of > 300 m2/g, mainly due to micropores. Both Br6nsted and Lewis acid sites were evidenced by infrared spectroscopy using pyridine as a probe molecule.

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Section: Investigation Of the Hydroxy-al Solutionsmentioning

confidence: 65%

Section: Investigation Of the Hydroxy-al Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Schutz

Stone

Poncelet

et al. 1987

Clays and clay miner.

147

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“…(Falaise and Nyman, 2016; Goberna-Ferrón et al, 2016; Sadeghi et al, 2015) For an additional control experiment, we prepared a solution of the Al13 Keggin ion, per the well-known synthesis. (Johansson, 1960) In this synthesis, 2.6 equivalents of NaOH are added dropwise to a heated aqueous solution of 0.1 molar aluminum nitrate. This solution indeed yielded X-ray scattering expected from a solution of fully-formed clusters.…”

Section: Computational Studiesmentioning

confidence: 99%

Crystallizing Elusive Chromium Polycations

Wang

Fullmer

Bandeira

et al. 2016

Chem

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SUMMARYOxo and oxo-hydroxo metal clusters are commonly isolated from aqueous solutions with capping ligands to prevent precipitation of metal hydroxides. Few simple molecular oxo-hydroxo metal clusters are readily synthesized and isolated without these capping ligands. Yet uncapped clusters are important in metal oxide growth and for applications hindered by auxiliary ligands. Uncapped clusters containing transition metals with partially filled d shells are especially difficult to preparethey rapidly aggregate and precipitate, preventing isolation of the initial cluster form. Herein, we elucidate a cluster self-assembly and crystallization process that has yielded a new uncapped oxo-hydroxo cluster containing Zn 2+ , Al 3+ , and the open-shell transition metal ion Cr 3+ , i.e., [ZnO4Al5.1Cr6.9(OH)24(H2O)12Zn(H2O)3] 8+ . For decades, clusters of Cr 3+ and Zn 2+ have been synthesis targets in polyoxocation chemistry, but they have resisted isolation and crystallization. We control pHdriven hydrolysis by oxidative dissolution of zinc in the reaction solution, rather than by addition of hydroxide. The control gained by Zn dissolution allows metal nitrate concentrations 10× higher than conventional hydroxide addition. Therefore, a high nitrate concentration further suppresses cluster self-assembly in the bulk. Contrary to common cluster growth studies, the fully assembled cluster is not observed spectroscopically in the bulk reaction solution from which the clusters are crystallized. Instead, the reaction solution is dominated by monomeric and dimeric metal species, even while the solution actively grows crystals. Evaporation of the HNO3-H2O azeotrope at the solution surface allows simultaneous cluster self-assembly and crystallization. Because these reactive clusters do not accumulate in the bulk solution and are isolated by crystallization, the state that often results in uncontrolled precipitation of metal hydroxide is avoided. The proposed formation pathway opens new opportunities to explore and augment the composition space and reaction chemistry of compositionally complex oxo-hydroxo clusters, particularly those comprising metals with partially filled d shells. The Bigger PictureAqueous metal-oxide clusters are important in natural processes, in synthesis, and in technology. In nature, they are central to contaminant transport, mineral growth, photosynthesis, and biomineralization. In synthesis, they provide nanometric forms with size dependent properties, and they are pre-assembled building blocks for materials. Fabricating functional metal oxide clusters and cluster-based materials in water minimizes environmental impact. Clusters synthesized and manipulated in water provide understanding of natural processes and inspire biomimetic materials; i.e. for artificial photosynthesis.While synthesis of functional clusters is accomplished with great control in organic solvents; it doesn't offer the simplicity and sustainability of aqueous synthesis. But aqueous syntheses that provide well-controlled cluster and mate...

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“…One has a composition [AI~304(OH)24(H20),2] 7+ (Al-13 polymer); the other is a fragment of gibbsite. The AI-13 polymer consists of a four-coordinated A104 tetrahedron surrounded by four trioctahedral OH-A1 units at the comers of a truncated tetrahedron (Johansson, 1960(Johansson, , 1963. 27A1 nuclear magnetic resonance (NMR) studies demonstrated the existence of four-coordinated AI in OH-A1 solutions (Akitt et aL, 1972;Farthing, 1978, 1981;Teagarden et aL, 1981;Bertsch et aL, 1986aBertsch et aL, , 1986b.…”

Section: Effect Of Seed Additionmentioning

confidence: 99%

Mechanisms of Gibbsite Crystallization from Partially Neutralized Aluminum Chloride Solutions

Hsu

1988

Clays and clay miner.

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Abstract--To interpret the erratic conditions, rates, and extent of gibbsite crystallization from partially neutralized A1C13 solution, the following hypothesis is proposed: The initial OH-AI polymers in the freshly prepared solutions were probably unstable and transformed into either gibbsite or stable OH-AI polymers via two different reaction paths. In the presence of nuclei, the OH-A1 polymers dissociated into monomeric ions, which then deposited onto nuclei to form gibbsite. In the absence of nuclei, the unstable polymers slowly converted to stable polymers. The erratic stability of OH-A1 solutions and gibbsite crystallization are therefore attributed to the relative magnitudes of these two reaction paths which, in turn, are attributed to two key factors: (1) the distribution of unstable vs. stable OH-A1 polymers; and (2) the presence or absence of nuclei. The duration of aging of the parent solution governed the distribution of unstable vs. stable polymers. The rate of neutralization resulted in varying localized high alkalinity in OH-AI solution preparation and thus varying development of nuclei.

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On the Crystal Structure of a Basic Aluminium Sulfate and the Corresponding Selenate.

Cited by 176 publications

References 0 publications

Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Preparation and Characterization of Bidimensional Zeolitic Structures Obtained from Synthetic Beidellite and Hydroxy-Aluminum Solutions

Crystallizing Elusive Chromium Polycations

Mechanisms of Gibbsite Crystallization from Partially Neutralized Aluminum Chloride Solutions

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