Structure cristalline du bis(oxalato)béryllate de potassium: K2[Be(C2O4)2]

Jaber, Maguy; Faure, R.; Loiseleur, H.

doi:10.1107/s0567740878003283

Cited by 22 publications

(5 citation statements)

References 6 publications

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“…The Be-O distances are within the range established by previous structure determinations of related compounds [5][6][7][8][9][10][11] (caption to Figure 2). It is noteworthy that the dianion of compound 5 with two seven-membered rings extends the set of structural data for beryllium spiro compounds, which to date includes examples with two five-membered rings [in the bis-(catecholate)] 6 and two six-membered rings (in the salicylate and cresotate).…”

Section: Resultssupporting

confidence: 80%

“…Research in beryllium chemistry has largely come to a standstill during the last few decades because of growing concern about the dangers possibly associated with any long-term handling of beryllium compounds. Not surprisingly, the few more recent studies of the coordination chemistry of beryllium have concentrated largely on the equilibria of aqueous solutions containing beryllium and biologically relevant ligand systems [amino acids, carbohydrates, glycerol, glycol, glycolic acid, catechol, salicylic acid, , malonic acid, oxalic acid, nitrilotris(propionic acid), etc. ], which may provide an answer to this key question in the physiological chemistry of beryllium.…”

Section: Introductionmentioning

confidence: 99%

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Beryllium Chelation by Dicarboxylic Acids in Aqueous Solution

1997

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Maleic and phthalic acids are found to react with Be(OH)(2), generated in situ from BeSO(4)(aq) and Ba(OH)(2)(aq), in aqueous solution at pH 3.0 or 4.4, respectively (25 degrees C), to give solutions containing the complexes (H(2)O)(2)Be[(OOCCH)(2)] (1) and (H(2)O)(2)Be[(OOC)(2)C(6)H(4)] (3). The products can be isolated in high yield and identified by microanalytical data. With 2 equiv of the dicarboxylic acids and the pH adjusted to 5.5 and 5.9, respectively, by addition of ammonia, the bis-chelate complexes [(NH(4))(+)](2){[Be[(OOCCH)(2)](2)}(2)(-) (2) and [(NH(4))(+)](2){Be[(OOC)(2)C(6)H(4)](2)}(2)(-) (4) are obtained, which can also be isolated. The compounds show distinct (9)Be, (1)H, and (13)C resonances in their NMR spectra in aqueous solutions. Layering of an aqueous solution of compound 4 with acetone at ambient temperature leads to the precipitation of single crystals suitable for an X-ray structure determination. This salt (5) was found to contain the bis-chelated dianion {Be[(OOC)(2)C(6)H(4)](2)}(2)(-) with the beryllium atom in the spiro center of two seven-membered rings and an overall geometry approaching closely C(2) symmetry. These anions are associated with two crystallographically independent but structurally similar counterions [MeC(O)CH(2)CMe(2)NH(3)](+), which are the product of a condensation reaction of the ammonium cation with the acetone solvent. In the crystal the ammonium hydrogen atoms of the cations form N-H.O hydrogen bonds with the oxo functions of the dianion.

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Section: Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Beryllium Chelation by Dicarboxylic Acids in Aqueous Solution

1997

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“…(b) Post & Trotter (1974). ( r6cemment (Jaber, Faure & Loiseleur, 1978). Les t&ra6dres de coordination de l'atome de b&yllium sont comparables avec des distances de liaison Be-O quasi 6gales dans chaque structure et de l'une ~ l'autre; le t&ra6dre du malonate est cependant plus r6gulier.…”

Section: D6termination De La Structureunclassified

Structure cristalline du bis(malonato)béryllate de potassium hémihydraté: K2[Be(CO2CH2CO2)2].1/2H2O

Duc¹,

Faure²,

Loiseleur³

1978

Acta Crystallogr Sect B

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“…Due to the hygroscopic nature of the oxalates, only few instances of successful single-crystal syntheses of solvent-free oxalates in sufficient size and quality for single-crystal analysis have been reported so far: by diffusion (Ag 2 C 2 O 4 ), slow evaporation from an aqueous solution (Li 2 C 2 O 4 , Na 2 C 2 O 4 , K 2 Be(C 2 O 4 ) 2 ), or hydrothermal crystallization (SrC 2 O 4 ) …”

Section: Introductionmentioning

confidence: 99%

Crystal and Molecular Structures of Alkali Oxalates: First Proof of a Staggered Oxalate Anion in the Solid State

et al. 2003

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The molecular and crystal structures of solvent-free potassium, rubidium, and cesium oxalates have been determined ab initio from high-resolution synchrotron and X-ray laboratory powder patterns. In the case of potassium oxalate K(2)C(2)O(4) (a = 10.91176(7) A, b = 6.11592(4) A, c = 3.44003(2) A, orthorhombic, Pbam, Z = 2), the oxalate anion is planar, whereas in cesium oxalate Cs(2)C(2)O(4) (a = 6.62146(5) A, b = 11.00379(9) A, c = 8.61253(7) A, beta = 97.1388(4) degrees, monoclinic, P2(1)/c, Z = 4) it exhibits a staggered conformation. For rubidium oxalate at room temperature, two polymorphs exist, one (beta-Rb(2)C(2)O(4)) isotypic to potassium oxalate (a = 11.28797(7) A, b = 6.29475(4) A, c = 3.62210(2) A, orthorhombic, Pbam, Z = 2) and the other (alpha-Rb(2)C(2)O(4)) isotypic to cesium oxalate (a = 6.3276(1) A, b = 10.4548(2) A, c = 8.2174(2) A, beta = 98.016(1) degrees, monoclinic, P2(1)/c, Z = 4). The potassium oxalate structure can be deduced from the AlB(2) type, and the cesium oxalate structure from the Hg(99)As type, respectively. The relation between the two types of crystal structures and the reason for the different conformations of the oxalate anion are discussed.

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Structure cristalline du bis(oxalato)béryllate de potassium: K₂[Be(C₂O₄)₂]

Cited by 22 publications

References 6 publications

Beryllium Chelation by Dicarboxylic Acids in Aqueous Solution

Beryllium Chelation by Dicarboxylic Acids in Aqueous Solution

Structure cristalline du bis(malonato)béryllate de potassium hémihydraté: K2[Be(CO2CH2CO2)2].1/2H2O

Crystal and Molecular Structures of Alkali Oxalates: First Proof of a Staggered Oxalate Anion in the Solid State

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