Silver trimagnesium phosphate bis­(hydrogenphosphate), AgMg3(PO4)(HPO4)2, with an alluaudite-like structure

Assani, A.; Saadi, M.; Zriouil, M.; El Ammari, L.

doi:10.1107/S1600536810053304

Volume 67
Part 1
Page i5
January 2011

Received 29 November 2010
Accepted 19 December 2010
Online 24 December 2010

Key indicators
Single-crystal X-ray study
T = 296 K
Mean (P-O) = 0.001 Å
Disorder in main residue
R = 0.026
wR = 0.075
Data-to-parameter ratio = 25.6
Details

Silver trimagnesium phosphate bis(hydrogenphosphate), AgMg₃(PO₄)(HPO₄)₂, with an alluaudite-like structure

Abderrazzak Assani,^a ^* Mohamed Saadi,^a Mohammed Zriouil ^a and Lahcen El Ammari ^a

^aLaboratoire de Chimie du Solide Appliquée, Faculté des Sciences, Université Mohammed V-Agdal, Avenue Ibn Battouta, BP 1014, Rabat, Morocco
Correspondence e-mail: abder_assani@yahoo.fr

The title compound, AgMg₃(PO₄)(HPO₄)₂, which has been synthesized by the hydrothermal method, has an alluaudite-like structure which is formed by edge-sharing MgO₆ octahedra (one of which has symmetry 2), resulting in chains linked together by phosphate groups and hydrogen bonds. The three-dimensional framework leads to two different channels along the c axis, one of which is occupied by Ag⁺ ions with a square-planar coordination. The Ag⁺ ions are disordered over two sites in a 0.89 (3):0.11 (3) ratio. The OH groups, which point into the other type of channel, are involved in strong O-HO hydrogen bonds. The title compound is isotypic with the compounds AM₃H₂(XO₄)(HXO₄)₂ (A = Na or Ag, M = Mn, Co or Ni, and X = P or As) of the alluaudite structure type.

Related literature

For applications of related compounds, see: Kacimi et al. (2005); Korzenski et al. (1998); Trad et al. (2010). For compounds with the same structure type, see: Moore (1971); Hatert (2008); Hatert et al. (2000); Assani et al. (2010); Guesmi & Driss (2002); Ben Smail & Jouini (2002); Stock & Bein (2003); Leroux et al. (1995).

Experimental

Crystal data

AgMg₃(PO₄)(HPO₄)₂
M_r = 467.73
Monoclinic, C 2/c
a = 11.9126 (5) Å
b = 12.1197 (6) Å
c = 6.4780 (3) Å
= 113.812 (2)°
V = 855.66 (7) Å³
Z = 4
Mo K radiation
= 3.21 mm^-1
T = 296 K
0.31 × 0.16 × 0.12 mm

Data collection

Bruker X8 APEX diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2005) T_min = 0.545, T_max = 0.680
10680 measured reflections
2330 independent reflections
1998 reflections with I > 2(I)
R_int = 0.034

Refinement

R[F² > 2(F²)] = 0.026
wR(F²) = 0.075
S = 1.08
2330 reflections
91 parameters
H-atom parameters constrained
_max = 0.63 e Å^-3
_min = -1.28 e Å^-3

Table 1
Hydrogen-bond geometry (Å, °)

D-HA	D-H	HA	DA	D-HA
O6-H6O1ⁱ	0.86	1.68	2.5266 (17)	168
Symmetry code: (i) $[-x+{\script{1\over 2}}, y+{\script{1\over 2}}, -z+{\script{1\over 2}}]$ .

Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: WinGX (Farrugia, 1999).

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: FJ2371 ).

Acknowledgements

The authors thank the Unit of Support for Technical and Scientific Research (UATRS, CNRST) for the X-ray measurements.

References

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inorganic compounds