The solid solution Na0.39(NH4)1.61SO4·Te(OH)6

Ktari, L.; Abdelhedi, M.; Dammak, M.; Cousson, A.; Kolsi, A.

doi:10.1107/S1600536808003425

inorganic compounds

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Volume 64| Part 3| March 2008| Pages i18-i19

doi:10.1107/S1600536808003425

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The solid solution Na_0.39(NH₄)_1.61SO₄·Te(OH)₆

Lilia Ktari,^a Mohamed Abdelhedi,^a,^b ^* Mohamed Dammak,^a Alain Cousson ^b and Abdelwaheb Kolsi ^a

^aLaboratoire de Chimie Inorganique, Faculté des Sciences de Sfax, 3018 Sfax, Tunisia, and ^bLaboratoire Léon Brillouin, CE Saclay, Bâtiment 563, 91191 Gif-sur-Yvette Cedex, France
^*Correspondence e-mail: m_abdelhedi2002@yahoo.fr

(Received 14 December 2007; accepted 31 January 2008; online 6 February 2008)

The title compound, sodium ammonium sulfate–telluric acid (1/1), Na_0.39(NH₄)_1.61SO₄·Te(OH)₆, is isostructural with other solid solutions in the series M_1−x(NH₄)_xSO₄·Te(OH)₆, where ammonium is partially replaced with an alkali metal (M = K, Rb or Cs). The structure is composed of planes of Te(OH)₆ octahedra alternating with planes of SO₄ tetrahedra. The Na⁺/NH₄⁺ cations are statistically distributed over the same position and are located between the planes. The structure is stabilized by O—H⋯O and N—H⋯O hydrogen bonds between the telluric acid adducts and the O atoms of sulfate groups, and between the ammonium cations and O atoms, respectively. Both Te atoms lie on centres of symmetry.

Related literature

For the sodium end-member of the solid solution series Na_1−x(NH₄)_xSO₄·Te(OH)₆, see: Zilber et al. (1980 ). For the ammonium end-member of the same series, see: Zilber et al. (1981 ). For other solid solutions in the system M_1−x(NH₄)_xSO₄·Te(OH)₆, where ammonium is partially replaced by an alkali metal, see: Dammak et al. (2005 ) for M = Cs; Ktari et al. (2002 ) for M = Rb; and Ktari et al. (2004 ) for M = K. For related literature, see: Prince (1982 ); Watkin (1994 ).

Experimental

Crystal data

Na_0.39(NH₄)_1.61SO₄·Te(OH)₆
M_r = 357.22
Monoclinic, P 2₁ /c
a = 13.690 (1) Å
b = 6.592 (1) Å
c = 11.345 (1) Å
β = 106.58 (1)°
V = 981.26 (19) Å³
Z = 4
Mo Kα radiation
μ = 3.30 mm⁻¹
T = 298 K
0.15 × 0.14 × 0.10 mm

Data collection

Nonius KappaCCD diffractometer
Absorption correction: multi-scan (MULABS in PLATON; Spek, 2007 ) T_min = 0.615, T_max = 0.719
919 measured reflections
849 independent reflections
638 reflections with I > 3σ(I)
R_int = 0.000

Refinement

R[F² > 2σ(F²)] = 0.032
wR(F²) = 0.043
S = 0.93
638 reflections
104 parameters
1 restraint
H-atom parameters constrained
Δρ_max = 0.51 e Å⁻³
Δρ_min = −1.15 e Å⁻³

Table 1
Selected bond lengths (Å)

Te1—O1	1.903 (6)
Te1—O2	1.905 (4)
Te1—O3	1.916 (3)
Te2—O4	1.914 (3)
Te2—O5	1.915 (4)
Te2—O6	1.904 (5)
S1—O7	1.486 (6)
S1—O8	1.485 (3)
S1—O9	1.474 (3)
S1—O10	1.460 (6)
Na1—O6ⁱ	2.873 (4)
Na1—O4ⁱⁱ	2.937 (6)
Na1—O5ⁱⁱⁱ	2.947 (4)
Na1—O3^iv	2.950 (4)
Na1—O7^v	2.978 (7)
Na1—O10^vi	3.008 (4)
Na1—O9	3.120 (4)
Na1—O6ⁱⁱ	3.267 (6)
Na1—O5^vii	3.278 (5)
Na2—O9	2.938 (5)
Na2—O8^vi	2.966 (4)
Na2—O4ⁱⁱ	3.029 (4)
Na2—O10^viii	3.037 (7)
Na2—O2^ix	3.050 (4)
Na2—O2^x	3.063 (5)
Na2—O1^xi	3.144 (5)
Na2—O3^vii	3.164 (5)
Na2—O1^iv	3.305 (6)
Symmetry codes: (i) $[-x, y-{\script{3\over 2}}, -z-{\script{1\over 2}}]$ ; (ii) x, y-1, z; (iii) $[x, -y+{\script{3\over 2}}, z-{\script{1\over 2}}]$ ; (iv) $[-x, y-{\script{1\over 2}}, -z-{\script{1\over 2}}]$ ; (v) $[x, -y-{\script{1\over 2}}, z-{\script{1\over 2}}]$ ; (vi) x, y+1, z; (vii) -x, -y+1, -z; (viii) $[x, -y-{\script{1\over 2}}, z+{\script{1\over 2}}]$ ; (ix) x-1, y, z; (x) -x, -y, -z; (xi) x-1, y-1, z.

Table 2
Hydrogen-bond and short contact geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2⋯O9^xii	0.924 (4)	1.787 (4)	2.700 (6)	169.2 (2)
O3—H3⋯O8^xiii	0.985 (5)	1.871 (5)	2.799 (7)	155.7 (2)
O4—H4⋯O7^xiv	0.937 (3)	1.798 (3)	2.706 (7)	162.4 (2)
O6—H6⋯O10^xiii	0.963 (4)	1.706 (4)	2.658 (6)	169.5 (3)
N1⋯.O6ⁱ			2.873 (4)
N1⋯O4ⁱⁱ			2.937 (6)
N1⋯O5ⁱⁱⁱ			2.947 (4)
N1⋯O3^iv			2.950 (4)
N1⋯O7^v			2.978 (7)
N1⋯O10^vi			3.008 (4)
N2⋯O9			2.938 (5)
N2⋯O8^vi			2.966 (4)
N2⋯O4ⁱⁱ			3.029 (4)
N2⋯O10^viii			3.037 (7)
N2⋯O2^ix			3.050 (4)
N2⋯O2^x			3.063 (5)
Symmetry codes: (i) $[-x, y-{\script{3\over 2}}, -z-{\script{1\over 2}}]$ ; (ii) x, y-1, z; (iii) $[x, -y+{\script{3\over 2}}, z-{\script{1\over 2}}]$ ; (iv) $[-x, y-{\script{1\over 2}}, -z-{\script{1\over 2}}]$ ; (v) $[x, -y-{\script{1\over 2}}, z-{\script{1\over 2}}]$ ; (vi) x, y+1, z; (viii) $[x, -y-{\script{1\over 2}}, z+{\script{1\over 2}}]$ ; (ix) x-1, y, z; (x) -x, -y, -z; (xii) $[-x, y+{\script{1\over 2}}, -z-{\script{1\over 2}}]$ ; (xiii) $[-x, y+{\script{3\over 2}}, -z-{\script{1\over 2}}]$ ; (xiv) x, y+2, z.

Data collection: COLLECT (Nonius, 2001 ); cell refinement: DENZO/SCALEPACK (Otwinowski & Minor, 1997 ); data reduction: DENZO/SCALEPACK; program(s) used to solve structure: SHELXS86 (Sheldrick, 2008 ); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003 ); molecular graphics: DIAMOND (Brandenburg & Berndt, 1999 ); software used to prepare material for publication: CRYSTALS.

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536808003425/wm2171sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808003425/wm2171Isup2.hkl

checkCIF report

Comment top

The studies of a partial cationic substitution on symmetry and physical properties of solid solutions in the series M_{1 -}_x(NH₄)_xSO₄.Te(OH)₆ (M = K, Rb and Cs) have been reported in previous communications, viz. for K_0.84(NH₄)_1.16SO₄.Te(OH)₆ (Ktari et al.., 2004), Rb_1.12(NH₄)_0.88SO₄.Te(OH)₆ (Ktari et al.., 2002), and Cs_0.86(NH₄)_1.14SO₄.Te(OH)₆ (Dammak et al.., 2005). To continue these studies, we have now investigated the solid solution Na_0.39(NH₄)_1.61SO₄.Te(OH)₆. This compound is isostructural with the aforementioned phases.

Fig. 1 shows a projection of the structure on the ab plane. The structure can be regarded as being built up of planes of Te(OH)₆ octahedra (at x = 0 and 1/2) alternating with planes of SO₄ tetrahedra (at x ≈ 1/4). The statistically disordered Na⁺/NH₄⁺ cations are intercalated between these planes. Both Te atoms are situated on inversion centres and exhibit similar Te(OH)₆ octahedra, with Te—O distances and O—Te—O angles ranging from 1.903 (6) to 1.916 (3) Å, and from 87.6 (2) to 92.4 (2)°, respectively (Fig. 2). In the sodium end-member Na₂SO₄.Te(OH)₆ (Zilber et al., 1980), the Te—O distances range from 1.879 (4) to 1.932 (3) Å, whereas in the ammonium end-member (NH₄)₂SO₄.Te(OH)₆ (Zilber et al., 1981) they vary from 1.874 (3) to 1.944 (3) Å. The SO₄ tetrahedra in the title compound are quite regular with S—O distances between 1.460 (6) and 1.486 (6)Å and O—S—O angles between 108.6 (3) and 110.6 (3)°. In the sodium end-member, the S—O distances are nearly the same (1.461 (5) to 1.497 (5) Å), whilst in the ammonium end-member they spread between 1.373 (11) and 1.565 (8) Å. In the mixed solution the Na/N atoms are 9-coordinate with (Na/N)—O bonds ranging from 2.873 (4) to 3.278 (5)Å for Na₁/N₁ and from 2.938 (5) to 3.305 (6)Å for Na₂/N₂. Thereby every cation is coordinated by three oxygen atoms belonging to SO₄ tetrahedra and by six oxygen atoms belonging to Te(OH)₆ octahedra. The structure of the title compound is stabilized via medium-strong O—H···O hydrogen bonds between the Te(OH)₆ octahedra and SO₄ tetrahedra (Fig. 3), and between N—H···O hydrogen bonds between the ammonium cations and various oxygen atoms in the structure (see hydrogen bonding Table).

Related literature top

For the sodium end-member of the solid solution series Na_{1 -}_x(NH₄)_xSO₄.Te(OH)₆, see: Zilber et al. (1980). For the ammonium end-member of the same series, see: Zilber et al. (1981). For other solid solutions in the system M_{1 -}_x(NH₄)_xSO₄.Te(OH)₆, where ammonium is partially replaced by an alkaline metal, see: Dammak et al. (2005) for M = Cs; Ktari et al. (2002) for M = Rb; and Ktari et al. (2004) for M = K.

For related literature, see: Prince (1982); Watkin (1994).

Experimental top

Transparent, colorless single crystals of the title compound were grown from an aqueous solution consisting of a stoichiometric mixture (ratio 1:1.5:0.5) of H₆TeO₆ (Aldrich, 99%) (NH₄)₂SO₄ (Aldrich, 99.99%) and Na₂SO₄ (Aldrich, 99%) after evaporation at room temperature.

Computing details top

Data collection: COLLECT (Nonius, 2001); cell refinement: DENZO/SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO/SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS86 (Sheldrick, 2008); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: DIAMOND (Brandenburg & Berndt, 1999); software used to prepare material for publication: CRYSTALS (Betteridge et al., 2003).

Figures top

	Fig. 1. Projection of the crystal structure of the title compound on the ab plane.
	Fig. 2. A part of the structure of Na_0.39(NH₄)_1.61SO₄.Te(OH)₆, with displacement ellipsoids drawn at the 50% probability level. [Symmetry codes:(a) -x + 1,-y, -z; (b) -x, -y + 1, -z]
	Fig. 3. Crystal structure of Na_0.39(NH₄)_1.61SO₄.Te(OH)₆ showing hydrogen bonds with dashed lines.

sodium ammonium sulfate–telluric acid (1/1) top

Crystal data top

Na_0.39(NH₄)_1.61SO₄·Te(OH)₆	F(000) = 678.224
M_r = 357.22	D_x = 2.418 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 919 reflections
a = 13.690 (1) Å	θ = 2.7–30.1°
b = 6.592 (1) Å	µ = 3.30 mm⁻¹
c = 11.345 (1) Å	T = 298 K
β = 106.58 (1)°	Parallelepiped, colourless
V = 981.26 (19) Å³	0.15 × 0.14 × 0.10 mm
Z = 4

Data collection top

Nonius KappaCCD diffractometer	638 reflections with I > 3σ(I)
Graphite monochromator	R_int = 0.000
ϕ scans	θ_max = 30.2°, θ_min = 1.6°
Absorption correction: multi-scan (MULABS in PLATON; Spek, 2007)	h = −16→14
T_min = 0.615, T_max = 0.719	k = −7→7
919 measured reflections	l = −5→5
849 independent reflections

Refinement top

Refinement on F	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.032	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.043	H-atom parameters constrained
S = 0.93	Chebychev polynomial, (Watkin, 1994, Prince, 1982) [weight] = 1.0/[A₀T₀(x) + A₁T₁(x) ··· + A_n-1]T_n-1(x)] where A_i are the Chebychev coefficients listed below and x = F /Fmax Method = Robust Weighting (Prince, 1982); W = [weight] [1-(deltaF/6*sigmaF)²]² A_i are: 0.527 0.367 0.302
638 reflections	(Δ/σ)_max = 0.000105
104 parameters	Δρ_max = 0.51 e Å⁻³
1 restraint	Δρ_min = −1.15 e Å⁻³

Crystal data top

Na_0.39(NH₄)_1.61SO₄·Te(OH)₆	V = 981.26 (19) Å³
M_r = 357.22	Z = 4
Monoclinic, P2₁/c	Mo Kα radiation
a = 13.690 (1) Å	µ = 3.30 mm⁻¹
b = 6.592 (1) Å	T = 298 K
c = 11.345 (1) Å	0.15 × 0.14 × 0.10 mm
β = 106.58 (1)°

Data collection top

Nonius KappaCCD diffractometer	849 independent reflections
Absorption correction: multi-scan (MULABS in PLATON; Spek, 2007)	638 reflections with I > 3σ(I)
T_min = 0.615, T_max = 0.719	R_int = 0.000
919 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.032	1 restraint
wR(F²) = 0.043	H-atom parameters constrained
S = 0.93	Δρ_max = 0.51 e Å⁻³
638 reflections	Δρ_min = −1.15 e Å⁻³
104 parameters

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Te1	0.5000	0.5000	0.0000	0.0099
Te2	0.0000	1.0000	0.0000	0.0106
S1	−0.24900 (9)	−0.49139 (17)	−0.2352 (2)	0.0124
Na1	−0.1448 (2)	0.0149 (2)	−0.3454 (2)	0.0181	0.2590
N1	−0.1448 (2)	0.0149 (2)	−0.3454 (2)	0.0181	0.7410
Na2	−0.3539 (2)	0.0047 (2)	−0.0920 (2)	0.0229	0.1300
N2	−0.3539 (2)	0.0047 (2)	−0.0920 (2)	0.0229	0.8700
O1	0.5309 (3)	0.5871 (6)	−0.1453 (6)	0.0241
O2	0.4606 (3)	0.2370 (5)	−0.0661 (5)	0.0232
O3	0.3647 (2)	0.6044 (5)	−0.0656 (5)	0.0174
O4	−0.1350 (2)	1.0859 (5)	−0.0867 (5)	0.0188
O5	0.0167 (2)	1.2375 (5)	0.1011 (5)	0.0150
O6	0.0519 (2)	1.1390 (5)	−0.1165 (6)	0.0174
O7	−0.1698 (3)	−0.5105 (5)	−0.1149 (6)	0.0221
O8	−0.3350 (2)	−0.6287 (5)	−0.2355 (5)	0.0160
O9	−0.2843 (2)	−0.2792 (5)	−0.2508 (5)	0.0202
O10	−0.2079 (3)	−0.5499 (6)	−0.3357 (6)	0.0213
H1	0.5496	0.4942	−0.1631	0.0500*
H2	0.4006	0.2489	−0.1288	0.0500*
H3	0.3748	0.7041	−0.1257	0.0500*
H4	−0.1328	1.2273	−0.0942	0.0500*
H5	−0.0379	1.3302	0.0591	0.0500*
H6	0.1037	1.0563	−0.1347	0.0500*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Te1	0.00995 (8)	0.00995 (8)	0.00995 (8)	0.00017 (8)	0.00296 (8)	0.00017 (8)
Te2	0.01064 (8)	0.01064 (8)	0.01064 (8)	0.00017 (8)	0.00316 (8)	0.00017 (8)
S1	0.0128 (9)	0.0116 (8)	0.013 (3)	0.0000 (4)	0.0042 (12)	0.0010 (8)
Na1	0.0213 (2)	0.0181 (2)	0.0197 (2)	0.0029 (2)	0.0133 (2)	0.0000 (2)
N1	0.0213 (2)	0.0181 (2)	0.0197 (2)	0.0029 (2)	0.0133 (2)	0.0000 (2)
Na2	0.0233 (2)	0.0199 (2)	0.0285 (2)	−0.0014 (2)	0.0122 (2)	0.0024 (2)
N2	0.0233 (2)	0.0199 (2)	0.0285 (2)	−0.0014 (2)	0.0122 (2)	0.0024 (2)
O1	0.0316 (18)	0.030 (2)	0.016 (2)	0.0127 (15)	0.015 (2)	0.009 (2)
O2	0.0272 (16)	0.0145 (12)	0.020 (4)	0.0006 (12)	−0.006 (2)	−0.0080 (17)
O3	0.0103 (11)	0.0209 (16)	0.021 (4)	0.0017 (11)	0.0045 (16)	0.003 (2)
O4	0.0143 (11)	0.0161 (16)	0.023 (4)	0.0017 (11)	0.0005 (15)	0.0052 (19)
O5	0.0194 (15)	0.0176 (14)	0.008 (3)	0.0032 (12)	0.0042 (19)	−0.0027 (16)
O6	0.0234 (16)	0.0191 (15)	0.014 (3)	0.0045 (13)	0.0119 (19)	0.0034 (17)
O7	0.0190 (18)	0.0192 (18)	0.022 (4)	−0.0001 (12)	−0.004 (2)	0.002 (2)
O8	0.0157 (15)	0.0212 (16)	0.013 (5)	−0.0030 (12)	0.006 (2)	0.002 (2)
O9	0.0167 (16)	0.0146 (13)	0.026 (5)	0.0022 (12)	0.001 (2)	0.001 (2)
O10	0.0189 (18)	0.0247 (16)	0.026 (4)	−0.0032 (14)	0.015 (2)	−0.005 (2)

Geometric parameters (Å, º) top

Te1—H1ⁱ	2.146	O4—H4	0.937
Te1—O3ⁱ	1.916 (3)	O5—H5	0.978
Te1—O2ⁱ	1.905 (4)	O6—H6	0.963
Te1—O1ⁱ	1.903 (6)	Na1—O6ⁱⁱⁱ	2.873 (4)
Te1—O1	1.903 (6)	Na1—O4^iv	2.937 (6)
Te1—O2	1.905 (4)	Na1—O5^v	2.947 (4)
Te1—O3	1.916 (3)	Na1—O3^vi	2.950 (4)
Te1—H1	2.146	Na1—O7^vii	2.978 (7)
Te2—O5ⁱⁱ	1.915 (4)	Na1—O10^viii	3.008 (4)
Te2—O4ⁱⁱ	1.914 (3)	Na1—O9	3.120 (4)
Te2—O6ⁱⁱ	1.904 (5)	Na1—O6^iv	3.267 (6)
Te2—O4	1.914 (3)	Na1—O5^ix	3.278 (5)
Te2—O5	1.915 (4)	Na2—O9	2.938 (5)
Te2—O6	1.904 (5)	Na2—O8^viii	2.966 (4)
S1—O7	1.486 (6)	Na2—O4^iv	3.029 (4)
S1—O8	1.485 (3)	Na2—O10^x	3.037 (7)
S1—O9	1.474 (3)	Na2—O2^xi	3.050 (4)
S1—O10	1.460 (6)	Na2—O2^xii	3.063 (5)
O1—H1	0.715	Na2—O1^xiii	3.144 (5)
O2—H2	0.924	Na2—O3^ix	3.164 (5)
O3—H3	0.985	Na2—O1^vi	3.305 (6)

O3ⁱ—Te1—O2ⁱ	92.32 (15)	O4ⁱⁱ—Te2—O6ⁱⁱ	89.85 (18)
O3ⁱ—Te1—O1ⁱ	89.1 (2)	O5ⁱⁱ—Te2—O4	90.07 (16)
O2ⁱ—Te1—O1ⁱ	92.4 (2)	O4ⁱⁱ—Te2—O4	179.994
O3ⁱ—Te1—O1	90.9 (2)	O6ⁱⁱ—Te2—O4	90.15 (18)
O2ⁱ—Te1—O1	87.6 (2)	O5ⁱⁱ—Te2—O5	179.994
O1ⁱ—Te1—O1	179.994	O4ⁱⁱ—Te2—O5	90.07 (16)
H1ⁱ—Te1—O2	103.413	O6ⁱⁱ—Te2—O5	88.98 (19)
O3ⁱ—Te1—O2	87.68 (15)	O4—Te2—O5	89.93 (16)
O2ⁱ—Te1—O2	179.994	O5ⁱⁱ—Te2—O6	88.98 (19)
O1ⁱ—Te1—O2	87.6 (2)	O4ⁱⁱ—Te2—O6	90.15 (18)
O1—Te1—O2	92.4 (2)	O6ⁱⁱ—Te2—O6	179.994
H1ⁱ—Te1—O3	79.615	O4—Te2—O6	89.85 (18)
O3ⁱ—Te1—O3	179.994	O5—Te2—O6	91.02 (19)
O2ⁱ—Te1—O3	87.68 (15)	O7—S1—O8	108.7 (3)
O1ⁱ—Te1—O3	90.9 (2)	O7—S1—O9	108.6 (3)
O1—Te1—O3	89.1 (2)	O8—S1—O9	110.21 (19)
O2—Te1—O3	92.32 (15)	O7—S1—O10	110.6 (3)
O5ⁱⁱ—Te2—O4ⁱⁱ	89.93 (16)	O8—S1—O10	108.6 (3)
O5ⁱⁱ—Te2—O6ⁱⁱ	91.02 (19)	O9—S1—O10	110.1 (3)

Symmetry codes: (i) −x+1, −y+1, −z; (ii) −x, −y+2, −z; (iii) −x, y−3/2, −z−1/2; (iv) x, y−1, z; (v) x, −y+3/2, z−1/2; (vi) −x, y−1/2, −z−1/2; (vii) x, −y−1/2, z−1/2; (viii) x, y+1, z; (ix) −x, −y+1, −z; (x) x, −y−1/2, z+1/2; (xi) x−1, y, z; (xii) −x, −y, −z; (xiii) x−1, y−1, z.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O2—H2···O9^xiv	0.924 (4)	1.787 (4)	2.700 (6)	169.2 (2)
O3—H3···O8^xv	0.985 (5)	1.871 (5)	2.799 (7)	155.7 (2)
O4—H4···O7^xvi	0.937 (3)	1.798 (3)	2.706 (7)	162.4 (2)
O6—H6···O10^xv	0.963 (4)	1.706 (4)	2.658 (6)	169.5 (3)
N1···O6ⁱⁱⁱ			2.873 (4)
N1···O4^iv			2.937 (6)
N1···O5^v			2.947 (4)
N1···O3^vi			2.950 (4)
N1···O7^vii			2.978 (7)
N1···O10^viii			3.008 (4)
N2···O9			2.938 (5)
N2···O8^viii			2.966 (4)
N2···O4^iv			3.029 (4)
N2···O10^x			3.037 (7)
N2···O2^xi			3.050 (4)
N2···O2^xii			3.063 (5)

Symmetry codes: (iii) −x, y−3/2, −z−1/2; (iv) x, y−1, z; (v) x, −y+3/2, z−1/2; (vi) −x, y−1/2, −z−1/2; (vii) x, −y−1/2, z−1/2; (viii) x, y+1, z; (x) x, −y−1/2, z+1/2; (xi) x−1, y, z; (xii) −x, −y, −z; (xiv) −x, y+1/2, −z−1/2; (xv) −x, y+3/2, −z−1/2; (xvi) x, y+2, z.

Experimental details

Crystal data
Chemical formula	Na_0.39(NH₄)_1.61SO₄·Te(OH)₆
M_r	357.22
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	298
a, b, c (Å)	13.690 (1), 6.592 (1), 11.345 (1)
β (°)	106.58 (1)
V (Å³)	981.26 (19)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	3.30
Crystal size (mm)	0.15 × 0.14 × 0.10

Data collection
Diffractometer	Nonius KappaCCD diffractometer
Absorption correction	Multi-scan (MULABS in PLATON; Spek, 2007)
T_min, T_max	0.615, 0.719
No. of measured, independent and observed [I > 3σ(I)] reflections	919, 849, 638
R_int	0.000
(sin θ/λ)_max (Å⁻¹)	0.707

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.032, 0.043, 0.93
No. of reflections	638
No. of parameters	104
No. of restraints	1
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.51, −1.15

Computer programs: COLLECT (Nonius, 2001), DENZO/SCALEPACK (Otwinowski & Minor, 1997), SHELXS86 (Sheldrick, 2008), CRYSTALS (Betteridge et al., 2003), DIAMOND (Brandenburg & Berndt, 1999).

Selected bond lengths (Å) top

Te1—O1	1.903 (6)	Na1—O7^v	2.978 (7)
Te1—O2	1.905 (4)	Na1—O10^vi	3.008 (4)
Te1—O3	1.916 (3)	Na1—O9	3.120 (4)
Te2—O4	1.914 (3)	Na1—O6ⁱⁱ	3.267 (6)
Te2—O5	1.915 (4)	Na1—O5^vii	3.278 (5)
Te2—O6	1.904 (5)	Na2—O9	2.938 (5)
S1—O7	1.486 (6)	Na2—O8^vi	2.966 (4)
S1—O8	1.485 (3)	Na2—O4ⁱⁱ	3.029 (4)
S1—O9	1.474 (3)	Na2—O10^viii	3.037 (7)
S1—O10	1.460 (6)	Na2—O2^ix	3.050 (4)
Na1—O6ⁱ	2.873 (4)	Na2—O2^x	3.063 (5)
Na1—O4ⁱⁱ	2.937 (6)	Na2—O1^xi	3.144 (5)
Na1—O5ⁱⁱⁱ	2.947 (4)	Na2—O3^vii	3.164 (5)
Na1—O3^iv	2.950 (4)	Na2—O1^iv	3.305 (6)

Symmetry codes: (i) −x, y−3/2, −z−1/2; (ii) x, y−1, z; (iii) x, −y+3/2, z−1/2; (iv) −x, y−1/2, −z−1/2; (v) x, −y−1/2, z−1/2; (vi) x, y+1, z; (vii) −x, −y+1, −z; (viii) x, −y−1/2, z+1/2; (ix) x−1, y, z; (x) −x, −y, −z; (xi) x−1, y−1, z.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O2—H2···O9^xii	0.924 (4)	1.787 (4)	2.700 (6)	169.2 (2)
O3—H3···O8^xiii	0.985 (5)	1.871 (5)	2.799 (7)	155.7 (2)
O4—H4···O7^xiv	0.937 (3)	1.798 (3)	2.706 (7)	162.4 (2)
O6—H6···O10^xiii	0.963 (4)	1.706 (4)	2.658 (6)	169.5 (3)
N1···O6ⁱ	.	.	2.873 (4)	.
N1···O4ⁱⁱ	.	.	2.937 (6)	.
N1···O5ⁱⁱⁱ	.	.	2.947 (4)	.
N1···O3^iv	.	.	2.950 (4)	.
N1···O7^v	.	.	2.978 (7)	.
N1···O10^vi	.	.	3.008 (4)	.
N2···O9	.	.	2.938 (5)	.
N2···O8^vi	.	.	2.966 (4)	.
N2···O4ⁱⁱ	.	.	3.029 (4)	.
N2···O10^viii	.	.	3.037 (7)	.
N2···O2^ix	.	.	3.050 (4)	.
N2···O2^x	.	.	3.063 (5)	.

Symmetry codes: (i) −x, y−3/2, −z−1/2; (ii) x, y−1, z; (iii) x, −y+3/2, z−1/2; (iv) −x, y−1/2, −z−1/2; (v) x, −y−1/2, z−1/2; (vi) x, y+1, z; (viii) x, −y−1/2, z+1/2; (ix) x−1, y, z; (x) −x, −y, −z; (xii) −x, y+1/2, −z−1/2; (xiii) −x, y+3/2, −z−1/2; (xiv) x, y+2, z.

Acknowledgements

This project was supported by the French Ministry of Research and New Technologies and the French/Tunisian Twin Committee for University Collaboration.

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