Na2MoO2As2O7

Jouini, R.; Zid, M.F.; Driss, A.

doi:10.1107/S1600536812048167

Volume 68
Part 12
Page i93
December 2012

Received 17 November 2012
Accepted 23 November 2012
Online 30 November 2012

Key indicators
Single-crystal X-ray study
T = 298 K
Mean (Mo-O) = 0.003 Å
Disorder in main residue
R = 0.022
wR = 0.058
Data-to-parameter ratio = 13.1
Details

Na₂MoO₂As₂O₇

Raja Jouini,^a Mohamed Faouzi Zid ^a ^* and Ahmed Driss ^a

^aLaboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis ElManar, 2092 ElManar II Tunis, Tunisia
Correspondence e-mail: faouzi.zid@fst.rnu.tn

Disodium molybdenum dioxide diarsenate, Na₂MoO₂As₂O₇, has been synthesized by a solid-state reaction. The structure is built up from MoAs₂O₁₂ linear units sharing corners to form a three-dimensional framework containing tunnels running along the a-axis direction in which the Na⁺ cations are located. In this framework, the As^V atoms are tetrahedrally coordinated and form an As₂O₇ group. The Mo^VI atom is displaced from the center of an octahedron of O atoms. Two Na⁺ cations are disordered about inversion centres. Structural relationships between different compounds: A₂MoO₂As₂O₇ (A = K, Rb), AMOP₂O₇ (A = Na, K, Rb; M = Mo, Nb) and MoP₂O₇ are discussed.

Related literature

For background to the physico-chemical properties of related compounds, see: Daidouh et al. (1997); Troup & Clearfield (1977); Guesdon et al. (1990). For details of structurally related compounds, see: Averbuch-Pouchot (1988, 1989); Zid et al. (1998, 2003); Ledain et al. (1996); Gueho et al. (1992); Fakhfakh et al. (1994); Linde et al. (1980); Leclaire et al. (1988). For the preparation, see: Zid & Jouini (1996); Zid et al. (1997, 1998); Hajji et al. (2004); Hajji & Zid (2006); Jouini et al. (2012); Ben Hlila et al. (2009). For bond-valence sums, see: Brown & Altermatt (1985).

Experimental

Crystal data

Na₂MoO₂As₂O₇
M_r = 435.76
Monoclinic, P 2₁ /c
a = 7.1130 (7) Å
b = 12.056 (2) Å
c = 9.8030 (9) Å
= 100.48 (2)°
V = 826.63 (18) Å³
Z = 4
Mo K radiation
= 9.66 mm^-1
T = 298 K
0.56 × 0.32 × 0.21 mm

Data collection

Enraf-Nonius CAD-4 diffractometer
Absorption correction: scan (North et al., 1968) T_min = 0.037, T_max = 0.134
2280 measured reflections
1790 independent reflections
1711 reflections with I > 2(I)
R_int = 0.019
2 standard reflections every 120 min intensity decay: 1.2%

Refinement

R[F² > 2(F²)] = 0.022
wR(F²) = 0.058
S = 1.25
1790 reflections
137 parameters
_max = 0.83 e Å^-3
_min = -0.75 e Å^-3

Data collection: CAD-4 EXPRESS (Duisenberg, 1992; Macícek & Yordanov, 1992); cell refinement: CAD-4 EXPRESS; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1998); software used to prepare material for publication: WinGX (Farrugia, 2012).

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BR2214 ).

References

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inorganic compounds