Crystal structure of dilead(II) oxochromate(VI) oxotellurate(IV).

Reaction of chromium(III) precursors with TeO2 in PbF2/PbO melts in air led to oxidation of chromium(III) to chromium(VI), whereas tellurium remained its oxidation state of IV. In the resulting title compound, Pb2(CrO4)(TeO3), the two types of anions are isolated from each other, hence a double salt is formed. The two independent Pb2+ cations exhibit coordination number nine under formation of very distorted coordination polyhedra [bond-length range = 2.363 (6)-3.276 (7) Å]. The oxochromate(VI) and oxotellurate(IV) anions have tetra-hedral and trigonal-pyramidal configurations, respectively. In the crystal structure, (001) layers of metal cations alternate with layers of TeO32- and CrO42- anions along [001], forming a three-dimensional framework structure. Pb2(CrO4)(TeO3) is isotypic with its sulfate analogue Pb2(SO4)(TeO3) and is comparatively discussed.

Chemical context

Pb3Fe2Te2O12 is an oxotellurate(VI) with inter­esting structural features. It crystallizes in the non-centrosymmetric space group Cc and has TeVI and FeIII atoms occupationally disordered at the same sites (Müller-Buschbaum & Wedel, 1997 ▸). This compound has been prepared by solid-state reactions from a PbO, Fe2O3 and TeO2 mixture in air, which led to oxidation of TeIV to TeVI. During an attempt to replace iron(III) by chromium(III) to prepare a possible phase with composition ‘Pb3Cr2Te2O12’, the title compound, Pb2(CrO4)(TeO3), was obtained instead while working under similar conditions. Inter­estingly, chromium was then oxidized (CrIII → CrVI) while tellurium remained its oxidation state of IV. Pb2(CrO4)(TeO3) is isotypic with its sulfate analogue Pb2(SO4)(TeO3) (Weil & Shirkhanlou, 2017 ▸).

Structural commentary

All atoms in the asymmetric unit, viz. two Pb, one Cr, one Te and seven O sites, are located on general positions.

The coordination environments of the two Pb2+ cations are markedly different. If only Pb—O bond lengths < 2.8 Å are considered, atom Pb1 is surrounded by six O atoms in the range 2.4–2.8 Å whereas atom Pb2 has four oxygen atoms as coordination partners, three at ∼2.38 Å and one at 2.75 Å. Taking into account the more remote oxygen atoms as well, the coordination numbers are increased to nine for both Pb2+ cations (Fig. 1 ▸, Table 1 ▸).

Figure 1

Coordination environments around the two Pb2+ cations in Pb2(CrO4)(TeO3). Pb—O bonds < 2.8 Å are given in full and longer Pb–O bonds are open. Symmetry operators refer to Table 1 ▸.

Table 1

Comparison of bond lengths between isotypic Pb2(CrO4)(TeO3) and Pb2(SO4)(TeO3)

Bond	Pb2(CrO4)(TeO3)	Pb2(SO4)(TeO3)
Pb1—O2i	2.429 (6)	2.397 (3)
Pb1—O3ii	2.573 (6)	2.594 (3)
Pb1—O2iii	2.594 (6)	2.536 (3)
Pb1—O7iv	2.617 (7)	2.632 (3)
Pb1—O5v	2.750 (7)	2.789 (3)
Pb1—O4i	2.777 (7)	2.677 (3)
Pb1—O6iii	2.850 (7)	3.107 (4)
Pb1—O1ii	2.968 (6)	2.993 (3)
Pb1—O3iii	3.170 (6)	3.206 (3)
Pb2—O3iii	2.363 (6)	2.335 (3)
Pb2—O1ii	2.390 (6)	2.375 (3)
Pb2—O1	2.410 (6)	2.384 (3)
Pb2—O2	2.746 (6)	2.753 (3)
Pb2—O5vi	2.956 (7)	2.981 (4)
Pb2—O4vii	3.128 (7)	3.029 (3)
Pb2—O6iii	3.176 (7)	3.164 (3)
Pb2—O5vii	3.225 (7)	3.200 (4)
Pb2—O4vi	3.276 (7)	3.455 (3)
Te1—O2	1.891 (6)	1.890 (2)
Te1—O3	1.901 (6)	1.878 (2)
Te1—O1	1.902 (6)	1.895 (3)
Cr1—O7	1.634 (7)	1.462 (3)
Cr1—O5	1.640 (7)	1.476 (3)
Cr1—O4	1.653 (7)	1.488 (3)
Cr1—O6	1.667 (7)	1.484 (3)

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

The chromium atom shows a tetra­hedral and the tellurium a trigonal–pyramidal coordination by oxygen atoms. These two coordination polyhedra and the corresponding bond lengths ranges are typical for oxochromates(VI) (Pressprich et al., 1988 ▸) and oxotellurates(IV) (Christy et al., 2016 ▸), respectively.

In the crystal structure, the Pb2+ cations are arranged in layers parallel to (001) at z ∼ 0, ½ and in turn are stacked into columns extending along [010]. The two types of anion polyhedra are isolated and are likewise arranged into columnar arrangements along [010], forming anion layers situated at z ∼ ¼ and ¾. The metal cation and anion layers alternate along [001] and build up the three-dimensional framework of the crystal structure. The 5s 2 and 6s 2 electron lone pairs of the TeIV atoms of the oxotellurate anions and of the Pb2+ cations, respectively, are stereochemically active and point into channels running parallel to the two types of columns along [010] (Fig. 2 ▸).

Figure 2

The crystal structure of Pb2(CrO4)(TeO3) in a projection along [010]. Te atoms and TeO3 2– trigonal pyramids are given in red, CrO4 2− tetra­hedra in green, Pb2+ cations in blue, O atoms are colourless. For clarity, only Pb—O bonds < 2.8 Å are displayed. Displacement ellipsoids are given at the 50% probability level.

Relevant bond lengths of isotypic Pb2(CrO4)(TeO3) and Pb2(SO4)(TeO3) are compared in Table 1 ▸. Whereas the TeO3 2− anions in the two structures show only marginal differences, the expected differences in the X—O bond lengths (X = Cr, S) of the chromate and sulfate tetra­hedra (average values 1.65 and 1.48 Å, respectively) also have consequences for those Pb—O bonds where the corresponding atoms O4–O7 are involved. These Pb—O bonds differ by up to 0.20 Å. A more qu­anti­tative comparison of the two isotypic structures was made with the program COMPSTRU (de la Flor et al., 2016 ▸). The degree of lattice distortion, S, is the spontaneous strain (sum of the squared eigenvalues of the strain tensor divided by 3) and amounts to 0.007. The maximum distance shows the maximal displacement between atomic positions of paired atoms and is 0.31 Å for atom pair O4. The next largest distances are 0.23 Å for pair O6, 0.17 Å for O5 and 0.13 Å for O7. The pairs of heavy atoms and the Cr/S pair show comparatively small distances of 0.095 Å (Pb1), 0.061 Å (Pb2), 0.087 Å (Te1) and 0.095 Å (Cr1/S1). The arithmetic mean of the distances is 0.12 Å. The measure of similarity (Δ) (Bergerhoff et al., 1999 ▸) is 0.034, revealing a close relation between the two structures. Δ takes into consideration the differences in atomic positions and the ratios of the corresponding lattice parameters of the structures.

Synthesis and crystallization

Cr(NO3)3·9H2O, PbF2, PbO and TeO2 were mixed thoroughly in a stoichiometric ratio of 1:1:2:1 and heated in an open alumina crucible to 1033 K within six h, held at this temperature for 30 h and cooled within eight h to room temperature. Most of the material had evaporated, and only a few orange plates of the title compound were left.

Alternatively, replacement of Cr(NO3)3·9H2O with Cr2O3 under the same reaction conditions likewise led to the formation of Pb2(CrO4)(TeO3).

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. Starting coordinates were taken from isotypic Pb2(SO4)(TeO3) (Weil & Shirkhanlou, 2017 ▸). The maximum and minimum electron densities are located 1.26 and 0.81 Å, respectively, from atom Pb2.

Table 2

Experimental details

Crystal data
Chemical formula	Pb2(CrO4)(TeO3)
M r	705.98
Crystal system, space group	Monoclinic, P21/n
Temperature (K)	296
a, b, c (Å)	7.4736 (12), 10.8091 (16), 9.4065 (14)
β (°)	111.098 (12)
V (Å3)	708.95 (19)
Z	4
Radiation type	Mo Kα
μ (mm−1)	52.91
Crystal size (mm)	0.09 × 0.06 × 0.01
Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2015 ▸)
T min, T max	0.264, 0.494
No. of measured, independent and observed [I > 2σ(I)] reflections	23485, 2183, 1760
R int	0.094
(sin θ/λ)max (Å−1)	0.717
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.031, 0.070, 1.06
No. of reflections	2183
No. of parameters	100
Δρmax, Δρmin (e Å−3)	2.47, −2.33

Computer programs: APEX3 and SAINT (Bruker, 2015 ▸), SHELXL2014 (Sheldrick, 2015 ▸), ATOMS (Dowty, 2006 ▸) and publCIF (Westrip, 2010 ▸).

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S2056989017006995/hb7677sup1.cif

Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989017006995/hb7677Isup2.hkl

CCDC reference: 1548953

Additional supporting information: crystallographic information; 3D view; checkCIF report

Pb2(CrO4)(TeO3)	F(000) = 1184
Mr = 705.98	Dx = 6.614 Mg m−3
Monoclinic, P21/n	Mo Kα radiation, λ = 0.71073 Å
a = 7.4736 (12) Å	Cell parameters from 3031 reflections
b = 10.8091 (16) Å	θ = 3.1–28.3°
c = 9.4065 (14) Å	µ = 52.91 mm−1
β = 111.098 (12)°	T = 296 K
V = 708.95 (19) Å3	Plate, orange
Z = 4	0.09 × 0.06 × 0.01 mm

Bruker APEXII CCD diffractometer	1760 reflections with I > 2σ(I)
ω– and φ–scans	Rint = 0.094
Absorption correction: multi-scan (SADABS; Bruker, 2015)	θmax = 30.7°, θmin = 3.0°
Tmin = 0.264, Tmax = 0.494	h = −10→10
23485 measured reflections	k = −15→15
2183 independent reflections	l = −13→13

Refinement on F2	100 parameters
Least-squares matrix: full	0 restraints
R[F2 > 2σ(F2)] = 0.031	w = 1/[σ2(Fo2) + (0.0264P)2] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.070	(Δ/σ)max = 0.001
S = 1.06	Δρmax = 2.47 e Å−3
2183 reflections	Δρmin = −2.33 e Å−3

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

	x	y	z	Uiso*/Ueq
Pb1	0.86662 (5)	0.16252 (3)	0.49204 (4)	0.01746 (9)
Pb2	1.27667 (5)	0.45615 (3)	0.56450 (4)	0.01735 (9)
Te1	1.11378 (8)	0.63302 (5)	0.81301 (6)	0.01180 (12)
Cr1	1.2298 (2)	0.61161 (13)	1.21196 (16)	0.0152 (3)
O1	1.0417 (9)	0.5911 (6)	0.6035 (7)	0.0187 (13)
O2	1.3339 (8)	0.5323 (5)	0.8562 (7)	0.0159 (12)
O3	1.2413 (9)	0.7803 (5)	0.7920 (6)	0.0153 (12)
O4	1.3081 (10)	0.4675 (6)	1.2262 (8)	0.0295 (17)
O5	1.3146 (11)	0.6714 (6)	1.3836 (8)	0.0292 (16)
O6	1.3082 (11)	0.6927 (7)	1.0953 (8)	0.0331 (18)
O7	0.9957 (10)	0.6054 (7)	1.1419 (9)	0.0337 (18)

	U11	U22	U33	U12	U13	U23
Pb1	0.01755 (19)	0.01525 (15)	0.01860 (18)	0.00102 (12)	0.00530 (14)	−0.00226 (12)
Pb2	0.01405 (18)	0.01770 (16)	0.01959 (18)	0.00177 (12)	0.00520 (14)	0.00440 (12)
Te1	0.0107 (3)	0.0117 (2)	0.0124 (3)	0.00001 (19)	0.0036 (2)	−0.00064 (19)
Cr1	0.0131 (7)	0.0191 (7)	0.0138 (7)	−0.0005 (5)	0.0053 (6)	−0.0002 (5)
O1	0.013 (3)	0.025 (3)	0.015 (3)	0.003 (3)	0.002 (3)	−0.004 (3)
O2	0.014 (3)	0.009 (3)	0.024 (3)	0.003 (2)	0.005 (3)	0.002 (2)
O3	0.018 (3)	0.013 (3)	0.014 (3)	−0.003 (2)	0.005 (3)	0.000 (2)
O4	0.032 (4)	0.024 (3)	0.031 (4)	0.003 (3)	0.010 (3)	−0.006 (3)
O5	0.041 (4)	0.028 (4)	0.018 (3)	0.007 (3)	0.010 (3)	−0.008 (3)
O6	0.040 (5)	0.036 (4)	0.029 (4)	−0.018 (3)	0.019 (4)	0.004 (3)
O7	0.017 (4)	0.039 (4)	0.043 (5)	0.005 (3)	0.010 (3)	0.015 (4)

Pb1—O2i	2.429 (6)	Cr1—Te1x	3.8465 (15)
Pb1—O3ii	2.573 (6)	Cr1—Pb1xi	3.9532 (15)
Pb1—O2iii	2.594 (6)	Cr1—Pb1v	3.9593 (14)
Pb1—O7iv	2.617 (7)	Cr1—Pb1xii	4.1534 (15)
Pb1—O5v	2.750 (7)	O1—Pb2ii	2.390 (6)
Pb1—O4i	2.777 (7)	O1—Pb1ii	2.968 (6)
Pb1—O6iii	2.850 (7)	O1—Pb1xi	4.515 (6)
Pb1—O1ii	2.968 (6)	O2—Pb1xi	2.429 (6)
Pb1—O3iii	3.170 (6)	O2—Pb1xii	2.594 (6)
Pb1—Te1iii	3.6630 (9)	O2—Pb1ii	4.508 (6)
Pb2—O3iii	2.363 (6)	O3—Pb2xii	2.363 (6)
Pb2—O1ii	2.390 (6)	O3—Pb1ii	2.573 (6)
Pb2—O1	2.410 (6)	O3—Pb1xii	3.170 (6)
Pb2—O2	2.746 (6)	O4—Pb1xi	2.777 (7)
Pb2—O5vi	2.956 (7)	O4—Pb2vii	3.128 (7)
Pb2—O4vii	3.128 (7)	O4—Te1v	3.228 (7)
Pb2—O6iii	3.176 (7)	O4—Pb2ix	3.276 (7)
Pb2—O5vii	3.225 (7)	O4—Pb1xii	4.262 (7)
Pb2—O4vi	3.276 (7)	O5—Pb1v	2.750 (7)
Pb2—Te1	3.5567 (7)	O5—Pb2ix	2.956 (7)
Te1—O2	1.891 (6)	O5—Pb2vii	3.225 (7)
Te1—O3	1.901 (6)	O5—Te1x	3.314 (8)
Te1—O1	1.902 (6)	O6—Pb1xii	2.850 (7)
Te1—O6	2.608 (7)	O6—Te1x	3.097 (7)
Te1—O7v	2.782 (7)	O6—Pb2xii	3.176 (7)
Te1—O6viii	3.097 (7)	O6—Pb2vii	3.912 (8)
Cr1—O7	1.634 (7)	O6—Pb1xi	4.023 (8)
Cr1—O5	1.640 (7)	O7—Pb1xiii	2.617 (7)
Cr1—O4	1.653 (7)	O7—Te1v	2.782 (7)
Cr1—O6	1.667 (7)	O7—Pb2v	4.032 (8)
Cr1—Pb2vii	3.6027 (16)	O7—Pb1v	4.081 (8)
Cr1—Pb2ix	3.6204 (15)	O7—Pb2ix	4.099 (7)
Cr1—Te1v	3.6339 (16)	O7—Pb1xi	4.568 (8)
O2i—Pb1—O3ii	74.19 (19)	O7—Cr1—Pb1xi	101.5 (3)
O2i—Pb1—O2iii	73.9 (2)	O5—Cr1—Pb1xi	136.8 (3)
O3ii—Pb1—O2iii	126.0 (2)	O4—Cr1—Pb1xi	35.4 (3)
O2i—Pb1—O7iv	69.6 (2)	O6—Cr1—Pb1xi	80.3 (3)
O3ii—Pb1—O7iv	70.9 (2)	Te1—Cr1—Pb1xi	60.35 (2)
O2iii—Pb1—O7iv	132.5 (2)	Pb2vii—Cr1—Pb1xi	75.50 (3)
O2i—Pb1—O5v	144.9 (2)	Pb2ix—Cr1—Pb1xi	99.99 (3)
O3ii—Pb1—O5v	105.45 (19)	Te1v—Cr1—Pb1xi	74.38 (3)
O2iii—Pb1—O5v	125.4 (2)	Te1x—Cr1—Pb1xi	110.89 (4)
O7iv—Pb1—O5v	77.1 (2)	O7—Cr1—Pb1v	82.5 (3)
O2i—Pb1—O4i	87.9 (2)	O5—Cr1—Pb1v	33.7 (3)
O3ii—Pb1—O4i	149.93 (19)	O4—Cr1—Pb1v	132.3 (3)
O2iii—Pb1—O4i	68.9 (2)	O6—Cr1—Pb1v	109.6 (3)
O7iv—Pb1—O4i	80.3 (2)	Te1—Cr1—Pb1v	131.89 (4)
O5v—Pb1—O4i	75.6 (2)	Pb2vii—Cr1—Pb1v	97.02 (3)
O2i—Pb1—O6iii	83.2 (2)	Pb2ix—Cr1—Pb1v	67.93 (3)
O3ii—Pb1—O6iii	69.8 (2)	Te1v—Cr1—Pb1v	101.01 (4)
O2iii—Pb1—O6iii	64.2 (2)	Te1x—Cr1—Pb1v	72.07 (3)
O7iv—Pb1—O6iii	136.9 (2)	Pb1xi—Cr1—Pb1v	167.69 (4)
O5v—Pb1—O6iii	130.5 (2)	O7—Cr1—Pb1xii	132.0 (3)
O4i—Pb1—O6iii	132.9 (2)	O5—Cr1—Pb1xii	108.4 (3)
O2i—Pb1—O1ii	127.50 (19)	O4—Cr1—Pb1xii	82.4 (3)
O3ii—Pb1—O1ii	59.35 (17)	O6—Cr1—Pb1xii	30.7 (3)
O2iii—Pb1—O1ii	113.96 (17)	Te1—Cr1—Pb1xii	56.17 (2)
O7iv—Pb1—O1ii	112.2 (2)	Pb2vii—Cr1—Pb1xii	62.31 (3)
O5v—Pb1—O1ii	75.3 (2)	Pb2ix—Cr1—Pb1xii	129.63 (4)
O4i—Pb1—O1ii	144.43 (19)	Te1v—Cr1—Pb1xii	132.87 (4)
O6iii—Pb1—O1ii	59.76 (19)	Te1x—Cr1—Pb1xii	54.39 (2)
O2i—Pb1—O3iii	125.43 (18)	Pb1xi—Cr1—Pb1xii	59.33 (2)
O3ii—Pb1—O3iii	116.15 (16)	Pb1v—Cr1—Pb1xii	126.12 (4)
O2iii—Pb1—O3iii	56.62 (16)	Te1—O1—Pb2ii	125.4 (3)
O7iv—Pb1—O3iii	164.00 (19)	Te1—O1—Pb2	110.6 (3)
O5v—Pb1—O3iii	87.05 (19)	Pb2ii—O1—Pb2	112.1 (2)
O4i—Pb1—O3iii	93.90 (18)	Te1—O1—Pb1ii	95.2 (2)
O6iii—Pb1—O3iii	56.72 (18)	Pb2ii—O1—Pb1ii	106.0 (2)
O1ii—Pb1—O3iii	64.71 (16)	Pb2—O1—Pb1ii	103.7 (2)
O2i—Pb1—Te1iii	94.34 (14)	Te1—O1—Pb1xi	55.69 (15)
O3ii—Pb1—Te1iii	114.85 (13)	Pb2ii—O1—Pb1xi	121.5 (2)
O2iii—Pb1—Te1iii	29.32 (12)	Pb2—O1—Pb1xi	63.04 (13)
O7iv—Pb1—Te1iii	161.34 (16)	Pb1ii—O1—Pb1xi	132.40 (18)
O5v—Pb1—Te1iii	116.07 (15)	Te1—O2—Pb1xi	121.8 (3)
O4i—Pb1—Te1iii	90.00 (15)	Te1—O2—Pb1xii	108.5 (2)
O6iii—Pb1—Te1iii	45.10 (15)	Pb1xi—O2—Pb1xii	106.1 (2)
O1ii—Pb1—Te1iii	84.89 (12)	Te1—O2—Pb2	98.5 (2)
O3iii—Pb1—Te1iii	31.26 (10)	Pb1xi—O2—Pb2	102.47 (19)
O3iii—Pb2—O1ii	87.6 (2)	Pb1xii—O2—Pb2	120.4 (2)
O3iii—Pb2—O1	101.9 (2)	Te1—O2—Pb1ii	52.16 (15)
O1ii—Pb2—O1	67.9 (2)	Pb1xi—O2—Pb1ii	163.9 (2)
O3iii—Pb2—O2	72.00 (18)	Pb1xii—O2—Pb1ii	89.88 (14)
O1ii—Pb2—O2	119.0 (2)	Pb2—O2—Pb1ii	66.54 (12)
O1—Pb2—O2	61.76 (19)	Te1—O3—Pb2xii	118.7 (3)
O3iii—Pb2—O5vi	177.4 (2)	Te1—O3—Pb1ii	109.1 (2)
O1ii—Pb2—O5vi	93.8 (2)	Pb2xii—O3—Pb1ii	109.8 (2)
O1—Pb2—O5vi	80.6 (2)	Te1—O3—Pb1xii	88.8 (2)
O2—Pb2—O5vi	109.06 (17)	Pb2xii—O3—Pb1xii	100.75 (19)
O3iii—Pb2—O4vii	95.8 (2)	Pb1ii—O3—Pb1xii	129.3 (2)
O1ii—Pb2—O4vii	176.63 (19)	Te1—O3—Pb2	58.39 (14)
O1—Pb2—O4vii	110.89 (19)	Pb2xii—O3—Pb2	176.2 (2)
O2—Pb2—O4vii	61.95 (18)	Pb1ii—O3—Pb2	73.89 (13)
O5vi—Pb2—O4vii	82.9 (2)	Pb1xii—O3—Pb2	77.08 (11)
O3iii—Pb2—O6iii	60.41 (19)	Cr1—O4—Pb1xi	124.4 (4)
O1ii—Pb2—O6iii	60.90 (19)	Cr1—O4—Pb2vii	92.6 (3)
O1—Pb2—O6iii	125.6 (2)	Pb1xi—O4—Pb2vii	103.2 (2)
O2—Pb2—O6iii	132.40 (18)	Cr1—O4—Te1v	90.3 (3)
O5vi—Pb2—O6iii	118.53 (18)	Pb1xi—O4—Te1v	99.5 (2)
O4vii—Pb2—O6iii	121.22 (17)	Pb2vii—O4—Te1v	150.2 (3)
O3iii—Pb2—O5vii	79.3 (2)	Cr1—O4—Pb2ix	88.1 (3)
O1ii—Pb2—O5vii	132.23 (19)	Pb1xi—O4—Pb2ix	147.0 (2)
O1—Pb2—O5vii	159.74 (19)	Pb2vii—O4—Pb2ix	78.49 (16)
O2—Pb2—O5vii	100.28 (16)	Te1v—O4—Pb2ix	71.93 (15)
O5vi—Pb2—O5vii	98.15 (17)	Cr1—O4—Te1	60.7 (2)
O4vii—Pb2—O5vii	49.20 (17)	Pb1xi—O4—Te1	64.28 (14)
O6iii—Pb2—O5vii	72.86 (18)	Pb2vii—O4—Te1	114.8 (2)
O3iii—Pb2—O4vi	128.57 (18)	Te1v—O4—Te1	92.34 (16)
O1ii—Pb2—O4vi	76.61 (19)	Pb2ix—O4—Te1	145.4 (2)
O1—Pb2—O4vi	115.84 (19)	Cr1—O4—Pb1xii	75.0 (3)
O2—Pb2—O4vi	156.81 (17)	Pb1xi—O4—Pb1xii	65.68 (15)
O5vi—Pb2—O4vi	49.92 (17)	Pb2vii—O4—Pb1xii	64.16 (13)
O4vii—Pb2—O4vi	101.51 (16)	Te1v—O4—Pb1xii	144.5 (2)
O6iii—Pb2—O4vi	69.25 (17)	Pb2ix—O4—Pb1xii	137.7 (2)
O5vii—Pb2—O4vi	76.56 (18)	Te1—O4—Pb1xii	52.26 (9)
O3iii—Pb2—Te1	87.36 (14)	Cr1—O5—Pb1v	126.9 (4)
O1ii—Pb2—Te1	93.13 (15)	Cr1—O5—Pb2ix	100.0 (3)
O1—Pb2—Te1	30.03 (14)	Pb1v—O5—Pb2ix	96.0 (2)
O2—Pb2—Te1	31.73 (12)	Cr1—O5—Pb2vii	89.4 (3)
O5vi—Pb2—Te1	94.68 (13)	Pb1v—O5—Pb2vii	143.1 (2)
O4vii—Pb2—Te1	86.63 (13)	Pb2ix—O5—Pb2vii	81.85 (17)
O6iii—Pb2—Te1	137.38 (13)	Cr1—O5—Te1x	95.9 (3)
O5vii—Pb2—Te1	131.31 (12)	Pb1v—O5—Te1x	98.0 (2)
O4vi—Pb2—Te1	141.21 (12)	Pb2ix—O5—Te1x	146.0 (3)
O2—Te1—O3	94.3 (3)	Pb2vii—O5—Te1x	68.42 (15)
O2—Te1—O1	89.2 (3)	Cr1—O6—Te1	109.9 (3)
O3—Te1—O1	93.3 (3)	Cr1—O6—Pb1xii	131.9 (4)
O2—Te1—O6	78.5 (3)	Te1—O6—Pb1xii	84.2 (2)
O3—Te1—O6	77.4 (2)	Cr1—O6—Te1x	103.6 (3)
O1—Te1—O6	163.8 (2)	Te1—O6—Te1x	146.3 (3)
O2—Te1—O7v	73.4 (2)	Pb1xii—O6—Te1x	75.99 (17)
O3—Te1—O7v	167.7 (2)	Cr1—O6—Pb2xii	136.5 (4)
O1—Te1—O7v	87.0 (2)	Te1—O6—Pb2xii	78.27 (18)
O6—Te1—O7v	99.2 (2)	Pb1xii—O6—Pb2xii	90.68 (17)
O2—Te1—O6viii	150.4 (2)	Te1x—O6—Pb2xii	75.03 (16)
O3—Te1—O6viii	72.5 (2)	Cr1—O6—Pb2vii	67.0 (2)
O1—Te1—O6viii	66.0 (2)	Te1—O6—Pb2vii	135.9 (3)
O6—Te1—O6viii	122.06 (13)	Pb1xii—O6—Pb2vii	71.42 (16)
O7v—Te1—O6viii	118.5 (2)	Te1x—O6—Pb2vii	61.99 (13)
O7—Cr1—O5	113.0 (4)	Pb2xii—O6—Pb2vii	136.1 (2)
O7—Cr1—O4	106.9 (4)	Cr1—O6—Pb1xi	75.6 (3)
O5—Cr1—O4	106.9 (3)	Te1—O6—Pb1xi	65.61 (16)
O7—Cr1—O6	109.6 (4)	Pb1xii—O6—Pb1xi	69.10 (16)
O5—Cr1—O6	109.8 (4)	Te1x—O6—Pb1xi	128.5 (2)
O4—Cr1—O6	110.5 (4)	Pb2xii—O6—Pb1xi	139.7 (2)
O7—Cr1—Te1	76.0 (3)	Pb2vii—O6—Pb1xi	71.46 (13)
O5—Cr1—Te1	151.4 (3)	Cr1—O7—Pb1xiii	163.1 (4)
O4—Cr1—Te1	95.3 (3)	Cr1—O7—Te1v	107.9 (3)
O6—Cr1—Te1	43.8 (3)	Pb1xiii—O7—Te1v	89.0 (2)
O7—Cr1—Pb2vii	161.7 (3)	Cr1—O7—Te1	77.3 (3)
O5—Cr1—Pb2vii	63.5 (3)	Pb1xiii—O7—Te1	95.7 (2)
O4—Cr1—Pb2vii	60.2 (3)	Te1v—O7—Te1	113.1 (2)
O6—Cr1—Pb2vii	87.8 (3)	Cr1—O7—Pb2v	117.5 (3)
Te1—Cr1—Pb2vii	116.13 (4)	Pb1xiii—O7—Pb2v	71.26 (16)
O7—Cr1—Pb2ix	95.0 (3)	Te1v—O7—Pb2v	59.62 (13)
O5—Cr1—Pb2ix	53.5 (3)	Te1—O7—Pb2v	164.5 (2)
O4—Cr1—Pb2ix	64.8 (3)	Cr1—O7—Pb1v	74.1 (3)
O6—Cr1—Pb2ix	154.9 (3)	Pb1xiii—O7—Pb1v	99.4 (2)
Te1—Cr1—Pb2ix	155.08 (4)	Te1v—O7—Pb1v	116.1 (2)
Pb2vii—Cr1—Pb2ix	68.28 (3)	Te1—O7—Pb1v	128.5 (2)
O7—Cr1—Te1v	46.7 (3)	Pb2v—O7—Pb1v	63.88 (12)
O5—Cr1—Te1v	111.3 (3)	Cr1—O7—Pb2ix	61.6 (2)
O4—Cr1—Te1v	62.7 (3)	Pb1xiii—O7—Pb2ix	129.8 (2)
O6—Cr1—Te1v	138.4 (3)	Te1v—O7—Pb2ix	64.15 (14)
Te1—Cr1—Te1v	94.66 (4)	Te1—O7—Pb2ix	133.03 (19)
Pb2vii—Cr1—Te1v	116.17 (4)	Pb2v—O7—Pb2ix	58.65 (10)
Pb2ix—Cr1—Te1v	63.55 (3)	Pb1v—O7—Pb2ix	62.50 (11)
O7—Cr1—Te1x	136.4 (3)	Cr1—O7—Pb1xi	58.0 (2)
O5—Cr1—Te1x	59.0 (3)	Pb1xiii—O7—Pb1xi	129.7 (2)
O4—Cr1—Te1x	116.4 (3)	Te1v—O7—Pb1xi	72.81 (16)
O6—Cr1—Te1x	51.5 (3)	Te1—O7—Pb1xi	53.91 (10)
Te1—Cr1—Te1x	95.23 (3)	Pb2v—O7—Pb1xi	128.24 (17)
Pb2vii—Cr1—Te1x	59.04 (2)	Pb1v—O7—Pb1xi	130.79 (17)
Pb2ix—Cr1—Te1x	106.81 (4)	Pb2ix—O7—Pb1xi	83.91 (12)
Te1v—Cr1—Te1x	170.10 (4)