Das Verhalten von Berylliumchlorid und Berylliumfluorid in wäßrigen Lösungen

Prytz, Milda

doi:10.1002/zaac.19372310303

Cited by 12 publications

(1 citation statement)

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“…The solutions are assumed to con tain largely the neutral, undissociated dihydrate BeF2(OH2)2 which is involved in strong hydrogen bonding with the aqueous environment [1], Re sults of more recent electrochemical studies have shown, however, that there is significant ligand re distribution of the fluoride and water ligands to give ionic species [2][3][4][5]. These conclusions were supported in a 19F NMR study, which showed the presence of three major components, [F2Be(OH2)2], [F3Be(OH2)]~, and [FBe(OH2)3]+, after equilibra tion in pure water at room temperature [6 -10].…”

Section: Introductionmentioning

confidence: 99%

Ligand Redistribution Equilibria in Aqueous Fluoroberyllate Solutions

Schmidt

Schmidbaur

1998

Zeitschrift Für Naturforschung B

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Fluoroberyllates, Beryllium Fluoride, Ligand Redistribution, NMR Data The composition of aqueous fluoroberyllate solutions has been studied by 9Be and l9F NMR spectroscopy for various ratios of the beryllium and fluorine concentrations, and at different pH values. The equilibrium constants have been determined for the ligand exchange processes, which involve the species [Be(OH2)4]2+, [BeF(OH2)3]+, [BeF2(OH2)2], [BeF3(OH2)]_ , and [BeFzi]2 -. These equilibria are shifted towards [BeF4]2_ at high pH. No polynuclear fluo roberyllates have been detected. The fluoride exchange between the individual species is slow on the NMR time scale at room temperature, and separate sharp signals with the expected multiplicity are therefore recorded. Calculated 9Be chemical shifts are in good agreement with experimental data.

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Section: Introductionmentioning

confidence: 99%

Ligand Redistribution Equilibria in Aqueous Fluoroberyllate Solutions

Schmidt

Schmidbaur

1998

Zeitschrift Für Naturforschung B

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Reactions of Beryllium Halides in Liquid Ammonia: The Tetraammineberyllium Cation [Be(NH₃)₄]²⁺, its Hydrolysis Products, and the Action of Be²⁺ as a Fluoride‐Ion Acceptor

Kraus¹,

Baer²,

Buchner³

et al. 2012

Chemistry A European J

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The first structural characterization of the text-book tetraammineberyllium(II) cation [Be(NH(3))(4)](2+), obtained in the compounds [Be(NH(3))(4)](2)Cl(4)⋅17NH(3) and [Be(NH(3))(4)]Cl(2), is reported. Through NMR spectroscopic and quantum chemical studies, its hydrolysis products in liquid ammonia were identified. These are the dinuclear [Be(2)(μ-OH)(NH(3))(6)](3+) and the cyclic [Be(2)(μ-OH)(2)(NH(3))(4)](2+) and [Be(3)(μ-OH)(3)(NH(3))(6)](3+) cations. The latter species was isolated as the compound [Be(3)(μ-OH)(3)(NH(3))(6)]Cl(3)⋅7NH(3). NMR analysis of solutions of BeF(2) in liquid ammonia showed that the [BeF(2)(NH(3))(2)] molecule was the only dissolved species. It acts as a strong fluoride-ion acceptor and forms the [BeF(3)(NH(3))](-) anion in the compound [N(2)H(7)][BeF(3)(NH(3))]. The compounds presented herein were characterized by single-crystal X-ray structure analysis, (9)Be, (17)O, and (19)F NMR, IR, and Raman spectroscopy, deuteration studies, and quantum chemical calculations. The extension of beryllium chemistry to the ammine system shows similarities but also decisive differences to the aquo system.

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