Pb3Te2O6Br2

Weil, M.; Stöger, B.

doi:10.1107/S1600536809053604

inorganic compounds

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Volume 66| Part 2| February 2010| Page i7

https://doi.org/10.1107/S1600536809053604

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Pb₃Te₂O₆Br₂

Matthias Weil ^a ^* and Berthold Stöger ^a

^aInstitute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria
^*Correspondence e-mail: mweil@mail.zserv.tuwien.ac.at

(Received 9 December 2009; accepted 12 December 2009; online 16 January 2010)

Single crystals of the title compound, trilead(II) bis[tellurate(IV)] dibromide, have been grown under hydrothermal conditions. The structure is isotypic with that of the chloride analogue, Pb₃Te₂O₆Cl₂, and consists of three Pb, two Te, two Br and four O atoms in the asymmetric unit. Except for two of the O atoms, all atoms are located on mirror planes. The Pb₃Te₂O₆Br₂ structure can be described as being built up from _∞²[Pb₃Te₂O₆]²⁺ layers extending parallel to (20 $[\overline{1}]$ ) and Br⁻ anions between the layers. Cohesion of the structure is accomplished through Pb—Br contacts of two of the three lead atoms, leading to highly asymmetric coordination polyhedra. The lone-pair electrons of both Te^IV and Pb^II atoms are stereochemically active and point towards the anionic halide layers.

Related literature

For reports and structures of other compounds in the system PbX₂—PbO—TeO₂, where X = Br, Cl, see: Pb₃TeO₄X₂ (Charkin et al., 2006 ; Porter & Halasyamani, 2003 ); Pb₃Te₂O₆X₂ (Porter & Halasyamani, 2003). The crystal chemistry of oxotellurate(IV) compounds has been reviewed by Dolgikh (1991 ) and Zemann (1971 ). For other oxotellurates(IV) prepared under hydrothermal conditions, see: Weil & Stöger (2007 , 2008a ,b ).

Experimental

Crystal data

Pb₃Te₂O₆Br₂
M_r = 1132.59
Monoclinic, C 2/m
a = 16.9151 (9) Å
b = 5.6813 (3) Å
c = 11.0623 (6) Å
β = 104.046 (1)°
V = 1031.3 (1) Å³
Z = 4
Mo Kα radiation
μ = 62.14 mm⁻¹
T = 296 K
0.18 × 0.10 × 0.04 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: numerical (HABITUS; Herrendorf, 1997 ) T_min = 0.06, T_max = 0.41
3758 measured reflections
1371 independent reflections
1338 reflections with I > 2σ(I)
R_int = 0.030

Refinement

R[F² > 2σ(F²)] = 0.048
wR(F²) = 0.107
S = 1.15
1371 reflections
73 parameters
Δρ_max = 7.41 e Å⁻³
Δρ_min = −6.41 e Å⁻³

Table 1
Comparative geometrical parameters (Å) for selected bond lengths in Pb₃Te₂O₆X₂ compounds (X = Br, Cl)

Distance	X= Br (this work)	X= Cl (Porter & Halasyamani, 2003)
Pb1—O4	2.415 (11)	2.447 (15)
Pb1—O1	2.617 (14)	2.586 (14)
Pb1—X2ⁱ	3.274 (3)	3.176 (12)
Pb1—X1	3.3287 (13)	3.237 (12)
Pb1—X1ⁱⁱ	3.364 (3)	3.247 (12)
Pb2—O1	2.360 (13)	2.374 (14)
Pb2—O3ⁱⁱⁱ	2.451 (18)	2.48 (2)
Pb2—O2	2.704 (19)	2.677 (13)
Pb2—X2	3.3955 (17)	3.270 (12)
Pb2—X1^iv	3.415 (3)	3.276 (13)
Pb3—O4	2.555 (12)	2.544 (16)
Pb3—O1	2.617 (13)	2.600 (14)
Pb3—O4^v	2.788 (11)	2.777 (17)
Pb3—O3ⁱⁱⁱ	2.995 (8)	2.986 (16)
Pb3—X2	3.338 (21)	3.244 (12)
Te1—O1	1.989 (13)	1.938 (13)
Te1—O2	2.085 (17)	2.044 (12)
Te2—O3	1.874 (19)	1.84 (2)
Te2—O4	1.879 (11)	1.861 (16)
Symmetry codes: (i) x + $[{1\over 2}]$ , y − $[{1\over 2}]$ , z; (ii) −x + $[{1\over 2}]$ , −y + $[{1\over 2}]$ , −z; (iii) −x + $[{1\over 2}]$ , −y + $[{1\over 2}]$ , −z + 1; (iv) x − $[{1\over 2}]$ , y − $[{1\over 2}]$ , z; (v) −x + $[{1\over 2}]$ , y + $[{1\over 2}]$ , −z + 1.

Data collection: APEX2 (Bruker, 2008 ); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ATOMS (Dowty, 2006 ); software used to prepare material for publication: SHELXL97.

Supporting information

Crystal structure: contains datablocks I, global. DOI: https://doi.org/10.1107/S1600536809053604/br2129sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809053604/br2129Isup2.hkl

checkCIF report

Comment top

Single crystals growth of Pb₃Te₂O₆Cl₂ and Pb₃Te₂O₆Br₂ was studied during a recent project intended to elaborate hydrothermal formation conditions of oxotelluraTe^IV compounds (Weil & Stöger, 2007; 2008a,b). Both Pb₃Te₂O₆X₂ (X = Br, Cl) compounds have been prepared previously by solid state techniques (Porter & Halasyamani, 2003). Whereas for the chloride compound a full structure analysis was undertaken at that time, for the isotypic bromide compound only lattice parameters were reported. Here we present details of the Pb₃Te₂O₆Br₂ structure determined from single-crystal X-ray data.

The asymmetric unit of the Pb₃Te₂O₆X₂ structure contains three Pb, two Te, two X and four O atoms. Except two of the O atoms, all other atoms are located on mirror planes. The Pb₃Te₂O₆X₂ structure type can be described as being built up from ²_∞[Pb₃Te₂O₆]²⁺ layers extending parallel to (201) and X^- anions between the layers. The tellurium atoms in the cationic layer are surrounded by four (Te1) and three (Te2) oxygen atoms in distorted tetrahedral (Te1) and trigonal-pyramidal (Te2) environments, respectively. Under an additional contribution of the lone electron pairs to the stereochemistry of the two Te^IV atoms, the corresponding Ψ-oxopolyhedra can be considered as distorted TeO₄E square pyramids (Te1) and TeO₃E tetrahedra (E designates the lone electron pair). These kinds of TeO_x polyhedra are frequently observed for various oxotelluraTe^IV structures (Dolgikh, 1991; Zemann, 1971). The Te1O₄ group forms Te1₂O₆ dimers via edge-sharing, whereas the Te2O₃ group is isolated in the layers. Both oxotelluraTe^IV units are surrounded by lead atoms. Four O atoms are bonded to Pb1, five O atoms to Pb2 and eight O atoms to Pb3. For both Pb₃Te₂O₆X₂ structures the respective Te—O and Pb—O distances are very similar (Table 1). The main difference between the Pb₃Te₂O₆X₂ structures pertains to the distances of the lead atoms to the X atoms that are situated between the cationic layers. As expected, the Pb—X distances are about 0.1 to 0.15 Å longer for the Br compound (Table 1). The layered character of the Pb₃Te₂O₆X₂ structure type with alternating layers parallel to (201) is also reflected by the differences of the lattice parameters for the Br and the Cl analogues. While the lengths of the b-axes are very similar (5.6813 (3) (Br) versus 5.6295 (4) Å (Cl)), a and c differ notedly (16.9151 (9) versus 16.4417 (11) Å, and 11.0623 (6) versus 10.8894 (7) Å) due to the different ionic radii of Br^- and Cl^-. The coordination of the halogen atoms in the neighbouring anionic layer to the lead atoms augments the coordination polyhedra of Pb1 and Pb2 to an overall coordination of [Pb1O₄X₄], [Pb2O₅X₃] and [Pb3O₈X].

All TeO_x and PbO_xX_y polyhedra in the structure are highly irregular. The lone-pair electrons of both Te^IV and Pb^II atoms are stereochemically active and point towards the anionic halide layers (Fig. 1). Similar TeO_x and PbO_xX_y polyhedra are observed for the Pb₃TeO₄X₂ structures (Charkin et al., 2006) that show a lower TeO₂ content in comparison with the Pb₃Te₂O₆X₂ structures.

Related literature top

For reports and structures of other compounds in the system PbX₂—PbO—TeO₂, where X = Br, Cl, see: Pb₃TeO₄X₂ (Charkin et al., 2006; Porter & Halasyamani, 2003); Pb₃Te₂O₆X₂ (Porter & Halasyamani, 2003). The crystal chemistry of oxotelluraTe^IV compounds has been reviewed by Dolgikh (1991) and Zemann (1971). For other oxotellurates(IV) prepared under hydrothermal conditions, see: Weil & Stöger (2007, 2008a,b).

Experimental top

All chemicals used were of analytical grade and employed without further purification. 1 mmol PbBr₂ (0.367 g) and 1 mmol TeO₂ (0.160 g) were placed in a Teflon inlay that was filled with a hydrous NH₄OH solution (10%_wt) to two-thirds of its volume. The inlay was placed in a steel autoclave and heated at 493 K for four weeks. The reaction product consisted of small colourless crystals of the title compound with rod-like habit and a maximum edge lengths of 0.2 mm. Experiments under similar conditions but with with PbCl₂ instead of PbBr₂ led to crystals of the isotypic compound Pb₃Te₂O₆Cl₂.

Structure description top

For reports and structures of other compounds in the system PbX₂—PbO—TeO₂, where X = Br, Cl, see: Pb₃TeO₄X₂ (Charkin et al., 2006; Porter & Halasyamani, 2003); Pb₃Te₂O₆X₂ (Porter & Halasyamani, 2003). The crystal chemistry of oxotelluraTe^IV compounds has been reviewed by Dolgikh (1991) and Zemann (1971). For other oxotellurates(IV) prepared under hydrothermal conditions, see: Weil & Stöger (2007, 2008a,b).

Computing details top

Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ATOMS (Dowty, 2006); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top

Fig. 1. The crystal structure of Pb₃Te₂O₆Br₂ in projection along [010]. Te atoms are given as red, Pb as blue, O atoms as white and Br atoms as green ellipsoids at the 74% probability level.

trilead(II) bis[telluraTe^IV] dibromide top

Crystal data top

Pb₃Te₂O₆Br₂	F(000) = 1872
M_r = 1132.59	D_x = 7.295 Mg m⁻³
Monoclinic, C2/m	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2y	Cell parameters from 4771 reflections
a = 16.9151 (9) Å	θ = 2.5–32.2°
b = 5.6813 (3) Å	µ = 62.14 mm⁻¹
c = 11.0623 (6) Å	T = 296 K
β = 104.046 (1)°	Rod, colourless
V = 1031.3 (1) Å³	0.18 × 0.10 × 0.04 mm
Z = 4

Data collection top

Bruker APEXII CCD diffractometer	1371 independent reflections
Radiation source: fine-focus sealed tube	1338 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.030
ω– and φ–scans	θ_max = 27.9°, θ_min = 1.9°
Absorption correction: numerical (HABITUS; Herrendorf, 1997)	h = −22→15
T_min = 0.06, T_max = 0.41	k = −7→7
3758 measured reflections	l = −13→14

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.048	w = 1/[σ²(F_o²) + (0.0166P)² + 250.8836P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.107	(Δ/σ)_max < 0.001
S = 1.15	Δρ_max = 7.41 e Å⁻³
1371 reflections	Δρ_min = −6.41 e Å⁻³
73 parameters	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.00021 (2)

Crystal data top

Pb₃Te₂O₆Br₂	V = 1031.3 (1) Å³
M_r = 1132.59	Z = 4
Monoclinic, C2/m	Mo Kα radiation
a = 16.9151 (9) Å	µ = 62.14 mm⁻¹
b = 5.6813 (3) Å	T = 296 K
c = 11.0623 (6) Å	0.18 × 0.10 × 0.04 mm
β = 104.046 (1)°

Data collection top

Bruker APEXII CCD diffractometer	1371 independent reflections
Absorption correction: numerical (HABITUS; Herrendorf, 1997)	1338 reflections with I > 2σ(I)
T_min = 0.06, T_max = 0.41	R_int = 0.030
3758 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.048	0 restraints
wR(F²) = 0.107	w = 1/[σ²(F_o²) + (0.0166P)² + 250.8836P] where P = (F_o² + 2F_c²)/3
S = 1.15	Δρ_max = 7.41 e Å⁻³
1371 reflections	Δρ_min = −6.41 e Å⁻³
73 parameters

Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

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

	x	y	z	U_iso*/U_eq
Pb1	0.26158 (6)	0.0000	0.21028 (8)	0.0178 (2)
Pb2	0.02616 (6)	0.0000	0.19788 (9)	0.0250 (3)
Pb3	0.16368 (6)	0.5000	0.39320 (8)	0.0217 (3)
Te1	0.10510 (10)	0.5000	0.04764 (16)	0.0233 (4)
Te2	0.37019 (9)	0.5000	0.41467 (14)	0.0141 (3)
Br1	0.31858 (15)	0.5000	0.0993 (2)	0.0205 (5)
Br2	−0.03969 (16)	0.5000	0.3103 (3)	0.0313 (6)
O1	0.1315 (8)	0.263 (3)	0.1840 (11)	0.028 (3)
O2	0.0000	0.294 (5)	0.0000	0.059 (7)
O3	0.3884 (15)	0.5000	0.5887 (17)	0.040 (5)
O4	0.2909 (7)	0.262 (2)	0.3877 (10)	0.017 (2)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Pb1	0.0224 (5)	0.0150 (4)	0.0161 (4)	0.000	0.0048 (3)	0.000
Pb2	0.0258 (5)	0.0204 (5)	0.0253 (5)	0.000	−0.0004 (4)	0.000
Pb3	0.0190 (4)	0.0261 (5)	0.0191 (4)	0.000	0.0026 (3)	0.000
Te1	0.0224 (8)	0.0186 (8)	0.0236 (8)	0.000	−0.0046 (6)	0.000
Te2	0.0117 (6)	0.0124 (7)	0.0177 (7)	0.000	0.0025 (5)	0.000
Br1	0.0208 (11)	0.0220 (11)	0.0183 (11)	0.000	0.0039 (9)	0.000
Br2	0.0202 (12)	0.0236 (13)	0.0525 (18)	0.000	0.0131 (12)	0.000
O1	0.032 (7)	0.026 (7)	0.023 (6)	−0.010 (6)	0.005 (5)	0.002 (5)
O2	0.031 (11)	0.062 (18)	0.09 (2)	0.000	0.028 (13)	0.000
O3	0.051 (13)	0.046 (14)	0.011 (8)	0.000	−0.014 (8)	0.000
O4	0.019 (5)	0.016 (6)	0.018 (5)	−0.007 (5)	0.009 (4)	−0.001 (4)

Geometric parameters (Å, º) top

Pb1—O4	2.415 (11)	Pb3—O4^viii	2.555 (12)
Pb1—O4ⁱ	2.415 (11)	Pb3—O4	2.555 (12)
Pb1—O1ⁱ	2.617 (14)	Pb3—O1	2.617 (13)
Pb1—O1	2.617 (14)	Pb3—O1^viii	2.617 (13)
Pb1—Br2ⁱⁱ	3.274 (3)	Pb3—O4^ix	2.788 (11)
Pb1—Br1ⁱⁱⁱ	3.3287 (13)	Pb3—O4^v	2.788 (11)
Pb1—Br1	3.3287 (13)	Pb3—O3^v	2.995 (8)
Pb1—Br1^iv	3.364 (3)	Pb3—O3^x	2.995 (8)
Pb2—O1	2.360 (13)	Pb3—Te2	3.4432 (17)
Pb2—O1ⁱ	2.360 (13)	Te1—O1^viii	1.989 (13)
Pb2—O3^v	2.451 (18)	Te1—O1	1.989 (13)
Pb2—O2^vi	2.704 (19)	Te1—O2	2.085 (17)
Pb2—O2	2.704 (19)	Te1—O2^xi	2.085 (17)
Pb2—Br2	3.3955 (17)	Te2—O3	1.874 (19)
Pb2—Br2ⁱⁱⁱ	3.3955 (17)	Te2—O4	1.879 (11)
Pb2—Br1^vii	3.415 (3)	Te2—O4^viii	1.879 (11)

O4—Pb1—O4ⁱ	76.0 (5)	O1—Te1—O2	80.4 (6)
O4—Pb1—O1ⁱ	116.3 (4)	O1^viii—Te1—O2^xi	80.4 (6)
O4ⁱ—Pb1—O1ⁱ	74.9 (4)	O1—Te1—O2^xi	126.3 (5)
O4—Pb1—O1	74.9 (4)	O2—Te1—O2^xi	68.2 (14)
O4ⁱ—Pb1—O1	116.3 (4)	O3—Te2—O4	95.5 (6)
O1ⁱ—Pb1—O1	69.7 (6)	O3—Te2—O4^viii	95.5 (6)
O1—Pb2—O1ⁱ	78.6 (7)	O4—Te2—O4^viii	92.3 (7)
O1—Pb2—O3^v	77.6 (5)	Te1—O1—Pb2	116.3 (6)
O1ⁱ—Pb2—O3^v	77.6 (5)	Te1—O1—Pb1	119.9 (6)
O1—Pb2—O2^vi	108.5 (4)	Pb2—O1—Pb1	105.0 (5)
O1ⁱ—Pb2—O2^vi	62.2 (4)	Te1—O1—Pb3	106.4 (6)
O3^v—Pb2—O2^vi	136.2 (5)	Pb2—O1—Pb3	105.4 (5)
O1—Pb2—O2	62.2 (4)	Pb1—O1—Pb3	101.9 (4)
O1ⁱ—Pb2—O2	108.5 (4)	Te1—O2—Te1^xi	111.8 (14)
O3^v—Pb2—O2	136.2 (5)	Te1—O2—Pb2^vi	120.87 (15)
O2^vi—Pb2—O2	76.4 (10)	Te1^xi—O2—Pb2^vi	100.36 (16)
O4^viii—Pb3—O4	64.0 (5)	Te1—O2—Pb2	100.36 (16)
O4^viii—Pb3—O1	104.3 (4)	Te1^xi—O2—Pb2	120.87 (15)
O4—Pb3—O1	72.7 (4)	Pb2^vi—O2—Pb2	103.6 (10)
O4^viii—Pb3—O1^viii	72.7 (4)	Te2—O3—Pb2^v	154.3 (13)
O4—Pb3—O1^viii	104.3 (4)	Te2—O4—Pb1	124.8 (5)
O1—Pb3—O1^viii	61.9 (6)	Te2—O4—Pb3	100.8 (5)
O1^viii—Te1—O1	85.1 (8)	Pb1—O4—Pb3	109.7 (4)
O1^viii—Te1—O2	126.3 (5)

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

Experimental details

Crystal data
Chemical formula	Pb₃Te₂O₆Br₂
M_r	1132.59
Crystal system, space group	Monoclinic, C2/m
Temperature (K)	296
a, b, c (Å)	16.9151 (9), 5.6813 (3), 11.0623 (6)
β (°)	104.046 (1)
V (Å³)	1031.3 (1)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	62.14
Crystal size (mm)	0.18 × 0.10 × 0.04

Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Numerical (HABITUS; Herrendorf, 1997)
T_min, T_max	0.06, 0.41
No. of measured, independent and observed [I > 2σ(I)] reflections	3758, 1371, 1338
R_int	0.030
(sin θ/λ)_max (Å⁻¹)	0.659

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.048, 0.107, 1.15
No. of reflections	1371
No. of parameters	73
	w = 1/[σ²(F_o²) + (0.0166P)² + 250.8836P] where P = (F_o² + 2F_c²)/3
Δρ_max, Δρ_min (e Å⁻³)	7.41, −6.41

Computer programs: APEX2 (Bruker, 2008), SAINT (Bruker, 2008), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ATOMS (Dowty, 2006).

Comparative geometrical parameters (Å) for selected bond lengths in Pb₃Te₂O₆X₂ compounds (X = Br, Cl) top

Distance	X= Br (this work)	X= Cl (Porter & Halasyamani, 2003)
Pb1—O4	2.415 (11)	2.447 (15)
Pb1—O1	2.617 (14)	2.586 (14)
Pb1—X2ⁱ	3.274 (3)	3.176 (12)
Pb1—X1	3.3287 (13)	3.237 (12)
Pb1—X1ⁱⁱ	3.364 (3)	3.247 (12)
Pb2—O1	2.360 (13)	2.374 (14)
Pb2—O3ⁱⁱⁱ	2.451 (18)	2.48 (2)
Pb2—O2	2.704 (19)	2.677 (13)
Pb2—X2	3.3955 (17)	3.270 (12)
Pb2—X1^iv	3.415 (3)	3.276 (13)
Pb3—O4	2.555 (12)	2.544 (16)
Pb3—O1	2.617 (13)	2.600 (14)
Pb3—O4^v	2.788 (11)	2.777 (17)
Pb3—O3ⁱⁱⁱ	2.995 (8)	2.986 (16)
Pb3—X2	3.338 (21)	3.244 (12)
Te1—O1	1.989 (13)	1.938 (13)
Te1—O2	2.085 (17)	2.044 (12)
Te2—O3	1.874 (19)	1.84 (2)
Te2—O4	1.879 (11)	1.861 (16)

Symmetry codes: (i) x+1/2, y-1/2, z; (ii) -x+1/2, -y+1/2, -z; (iii) -x+1/2, -y+1/2, -z+1; (iv) x-1/2, y-1/2, z; (v) -x+1/2, y+1/2, -z+1.

Acknowledgements

Financial support of the FWF (Fonds zur Förderung der wissenschaftlichen Forschung), project P19099-N17, is gratefully acknowledged.

References

Bruker (2008). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Charkin, D. O., Morozov, O. S., Ul'yanova, E. A., Berdonosov, P. S., Dolgikh, V. A., Dickinson, C., Zhou, W. & Lightfoot, P. (2006). Solid State Sci. 8, 1029–1034. Web of Science CrossRef CAS Google Scholar
Dolgikh, V. A. (1991). Russ. J. Inorg. Chem. 36, 1117–1129. Google Scholar
Dowty, E. (2006). ATOMS for Windows. Shape Software, Kingsport, Tennessee, USA. Google Scholar
Herrendorf, W. (1997). HABITUS. Universities of Karlsruhe and Giessen, Germany. Google Scholar
Porter, Y. & Halasyamani, P. S. (2003). Inorg. Chem. 42, 205–209. Web of Science CrossRef PubMed CAS Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Weil, M. & Stöger, B. (2007). Acta Cryst. E63, i202. Web of Science CrossRef IUCr Journals Google Scholar
Weil, M. & Stöger, B. (2008a). Acta Cryst. C64, i79–i81. Web of Science CrossRef IUCr Journals Google Scholar
Weil, M. & Stöger, B. (2008b). Acta Cryst. E64, i3. Web of Science CrossRef IUCr Journals Google Scholar
Zemann, J. (1971). Monatsh. Chem. 102, 1209–1216. CrossRef CAS Web of Science Google Scholar