CobaltMaghrebV1, Main, Exploration, bibRecord, 000361

Na3Co2(AsO4)(As2O7): a new sodium cobalt arsenate

Identifieur interne : 000361 ( Main/Exploration ); précédent : 000360; suivant : 000362

Na3Co2(AsO4)(As2O7): a new sodium cobalt arsenate

Auteurs : Abderrahmen Guesmi [Tunisie] ; Ahmed Driss [Tunisie]

Source :

Acta Crystallographica Section E: Structure Reports Online [ 1600-5368 ] ; 2012.

RBID : PMC:3393142

Abstract

In the title compound, trisodium dicobalt arsenate diarsenate, Na₃Co₂AsO₄As₂O₇, the two Co atoms, one of the two As and three of the seven O atoms lie on special positions, with site symmetries 2 and m for the Co, m for the As, and 2 and twice m for the O atoms. The two Na atoms are disordered over two general and special positions [occupancies 0.72 (3):0.28 (3) and 0.940 (6):0.060 (6), respectively]. The main structural feature is the association of the CoO₆ octahedra in the ab plane, forming Co₄O₂₀ units, which are corner- and edge-connected via AsO₄ and As₂O₇ arsenate groups, giving rise to a complex polyhedral connectivity with small tunnels, such as those running along the b- and c-axis directions, in which the Na⁺ ions reside. The structural model is validated by both bond-valence-sum and charge-distribution methods, and the distortion of the coordination polyhedra is analyzed by means of the effective coordination number.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3393142

DOI: 10.1107/S1600536812027791
PubMed: 22807699
PubMed Central: 3393142

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p>In the title compound, trisodium dicobalt arsenate diarsenate, Na<sub>3</sub>
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AsO<sub>4</sub>
As<sub>2</sub>
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 for the As, and 2 and twice <italic>m</italic>
 for the O atoms. The two Na atoms are disordered over two general and special positions [occupancies 0.72 (3):0.28 (3) and 0.940 (6):0.060 (6), respectively]. The main structural feature is the association of the CoO<sub>6</sub>
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O<sub>20</sub>
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 and As<sub>2</sub>
O<sub>7</sub>
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- and <italic>c</italic>
-axis directions, in which the Na<sup>+</sup>
 ions reside. The structural model is validated by both bond-valence-sum and charge-distribution methods, and the distortion of the coordination polyhedra is analyzed by means of the effective coordination number.</p>
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Na3Co2(AsO4)(As2O7): a new sodium cobalt arsenate

Na3Co2(AsO4)(As2O7): a new sodium cobalt arsenate

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Abstract

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