Tl₄Nb₂Se₁₁

The ternary compound tetra­thallium diniobium undeca­selenide, Tl₄Nb₂Se₁₁, was prepared by a molten flux method from a melt of Tl₂Se, elemental Se and Nb. The structure is composed of discrete Tl⁺ cations and complex [Nb₂Se₁₁]^4- anions. In the anion, the two crystallographically independent Nb atoms are sevenfold coordinated by Se atoms to form a distorted penta­gonal bipyramid. Two NbSe₇ polyhedra have a face in common, thus yielding the [Nb₂Se₁₁]^4- unit. The crystal structure of Tl₄Nb₂Se₁₁ is isotypic with the structure of the homologous tantalum compound Tl₄Ta₂Se₁₁ [Teske et al. (2002). Z. Anorg. Allg. Chem. 628, 2651-2655], which was the first polyselenide with discrete complex [M₂Se₁₁]^4- anions.

Key indicators

• Single-crystal X-ray study
• T = 295 K
• Mean [sigma](e-Se)= 0.003 Å
• R factor = 0.055
• wR factor = 0.161
• Data-to-parameter ratio = 29.5

checkCIF/PLATON results

No syntax errors found


No errors found in this datablock

---

Computing details

Data collection: DIF4 (Stoe & Cie, 1992); cell refinement: DIF4; data reduction: REDU4 (Stoe & Cie, 1992); program(s) used to solve structure: coordinates taken from the isotypic Ta compound; program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: DIAMOND (Crystal Impact, 1999); software used to prepare material for publication: SHELXL97.

tetrathallium diniobium undecaselenide

Crystal data

Tl4Nb2Se11	Z = 2
Mr = 1871.86	F(000) = 1560
Triclinic, P1	Dx = 6.555 Mg m^−3
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 7.974 (4) Å	Cell parameters from 70 reflections
b = 9.147 (5) Å	θ = 10–25°
c = 13.626 (7) Å	µ = 56.11 mm^−1
α = 73.11 (4)°	T = 295 K
β = 89.26 (4)°	Column, black
γ = 85.76 (6)°	0.24 × 0.16 × 0.12 mm
V = 948.4 (9) Å^3

Data collection

Philips PW1100 four-circle diffractometer	3582 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.092
Graphite monochromator	θmax = 28.0°, θmin = 2.3°
ω/θ scans	h = 0→10
Absorption correction: numerical [X-SHAPE (Stoe & Cie, 1998) and X-RED (Stoe & Cie, 1998)]	k = −12→12
Tmin = 0.005, Tmax = 0.035	l = −17→17
4895 measured reflections	3 standard reflections every 120 min
4572 independent reflections	intensity decay: none

Refinement

Refinement on F^2	Primary atom site location: isomorphous structure methods
Least-squares matrix: full	w = 1/[σ^2(Fo^2) + (0.1091P)^2 + 9.5978P] where P = (Fo^2 + 2Fc^2)/3
R[F^2 > 2σ(F^2)] = 0.055	(Δ/σ)max = 0.011
wR(F^2) = 0.161	Δρmax = 5.28 e Å^−3
S = 1.07	Δρmin = −4.33 e Å^−3
4572 reflections	Extinction correction: SHELXL97, Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
155 parameters	Extinction coefficient: 0.0021 (2)
0 restraints

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq
Tl1	0.05580 (9)	0.75940 (9)	0.98206 (6)	0.0342 (2)
Tl2	0.21340 (9)	0.97435 (9)	0.57114 (6)	0.0319 (2)
Tl3	0.50978 (10)	0.28359 (9)	0.88359 (6)	0.0343 (2)
Tl4	0.24589 (9)	0.41602 (9)	0.58261 (6)	0.0325 (2)
Nb1	0.33843 (16)	0.10590 (15)	0.18896 (11)	0.0152 (3)
Nb2	0.12052 (16)	0.36737 (15)	0.30376 (11)	0.0153 (3)
Se1	0.2724 (2)	0.03599 (19)	0.03726 (13)	0.0213 (3)
Se2	0.4498 (2)	0.6912 (2)	0.88028 (14)	0.0232 (3)
Se3	0.26580 (19)	0.40226 (17)	0.10795 (12)	0.0176 (3)
Se4	0.02682 (19)	0.12801 (19)	0.25065 (13)	0.0204 (3)
Se5	0.3941 (2)	0.0791 (2)	0.75080 (15)	0.0271 (4)
Se6	0.3521 (2)	0.85032 (19)	0.33575 (14)	0.0268 (4)
Se7	0.4014 (2)	0.4482 (2)	0.35147 (14)	0.0247 (4)
Se8	0.1266 (2)	0.4910 (2)	0.81518 (15)	0.0267 (4)
Se9	0.0500 (2)	0.66106 (19)	0.24660 (14)	0.0238 (3)
Se10	0.3948 (2)	0.18285 (19)	0.37424 (13)	0.0209 (3)
Se11	0.0190 (2)	0.7083 (2)	0.53083 (13)	0.0224 (3)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Tl1	0.0243 (3)	0.0367 (4)	0.0392 (4)	0.0043 (3)	−0.0009 (3)	−0.0089 (3)
Tl2	0.0268 (3)	0.0348 (4)	0.0327 (4)	−0.0090 (3)	0.0044 (3)	−0.0059 (3)
Tl3	0.0380 (4)	0.0286 (4)	0.0391 (4)	0.0011 (3)	−0.0034 (3)	−0.0151 (3)
Tl4	0.0244 (3)	0.0360 (4)	0.0380 (4)	0.0053 (3)	−0.0031 (3)	−0.0139 (3)
Nb1	0.0126 (5)	0.0138 (6)	0.0195 (6)	0.0006 (4)	0.0034 (5)	−0.0059 (5)
Nb2	0.0133 (5)	0.0156 (6)	0.0178 (6)	−0.0013 (5)	0.0037 (4)	−0.0065 (5)
Se1	0.0191 (7)	0.0233 (8)	0.0245 (8)	0.0010 (6)	0.0023 (6)	−0.0122 (6)
Se2	0.0169 (7)	0.0251 (8)	0.0308 (9)	−0.0072 (6)	0.0097 (6)	−0.0121 (7)
Se3	0.0198 (7)	0.0155 (7)	0.0173 (7)	−0.0005 (5)	0.0033 (5)	−0.0050 (6)
Se4	0.0156 (6)	0.0230 (8)	0.0263 (8)	−0.0067 (6)	0.0088 (6)	−0.0122 (6)
Se5	0.0203 (7)	0.0282 (8)	0.0342 (10)	0.0083 (6)	−0.0028 (6)	−0.0133 (7)
Se6	0.0307 (9)	0.0201 (8)	0.0273 (9)	−0.0006 (7)	0.0018 (7)	−0.0038 (7)
Se7	0.0186 (7)	0.0298 (9)	0.0296 (9)	−0.0078 (6)	0.0026 (6)	−0.0133 (7)
Se8	0.0203 (7)	0.0287 (9)	0.0318 (9)	0.0003 (6)	−0.0050 (6)	−0.0102 (7)
Se9	0.0274 (8)	0.0188 (7)	0.0266 (8)	0.0001 (6)	0.0021 (6)	−0.0093 (6)
Se10	0.0184 (7)	0.0236 (8)	0.0193 (7)	0.0031 (6)	0.0020 (5)	−0.0052 (6)
Se11	0.0218 (7)	0.0251 (8)	0.0212 (8)	−0.0023 (6)	0.0080 (6)	−0.0081 (6)

Geometric parameters (Å, º)

Tl1—Se1^i	3.071 (3)	Nb1—Se6^x	2.594 (3)
Tl1—Se4^i	3.099 (3)	Nb1—Se5^viii	2.606 (3)
Tl1—Se8^ii	3.422 (3)	Nb1—Se4	2.625 (2)
Tl1—Se1^iii	3.426 (3)	Nb1—Se3	2.636 (3)
Tl1—Se9^iv	3.453 (3)	Nb1—Se10	2.860 (3)
Tl1—Se3^i	3.459 (3)	Nb2—Se11^i	2.437 (3)
Tl1—Se2	3.505 (3)	Nb2—Se7	2.559 (3)
Tl1—Se3^iv	3.526 (3)	Nb2—Se7	2.559 (3)
Tl1—Se8	3.811 (3)	Nb2—Se8^i	2.584 (3)
Tl2—Se4^i	3.044 (2)	Nb2—Se9	2.591 (3)
Tl2—Se11	3.160 (3)	Nb2—Se4	2.656 (2)
Tl2—Se10^v	3.203 (3)	Nb2—Se10	2.669 (3)
Tl2—Se5^v	3.263 (3)	Nb2—Se3	2.836 (3)
Tl2—Se11^vi	3.274 (3)	Se1—Tl1^i	3.071 (3)
Tl2—Se10^vii	3.340 (3)	Se1—Tl3^viii	3.193 (3)
Tl2—Se6	3.825 (3)	Se1—Tl3^xi	3.297 (3)
Tl3—Se5	3.144 (2)	Se2—Se3^vii	2.355 (3)
Tl3—Se5	3.144 (2)	Se2—Nb1^vii	2.568 (3)
Tl3—Se1^viii	3.193 (3)	Se3—Se2^vii	2.355 (3)
Tl3—Se1^iv	3.297 (3)	Se4—Tl2^i	3.044 (2)
Tl3—Se2^ix	3.313 (3)	Se4—Tl1^i	3.099 (3)
Tl3—Se8	3.463 (3)	Se5—Se6^vii	2.365 (3)
Tl3—Se7^vii	3.523 (3)	Se5—Nb1^viii	2.606 (3)
Tl3—Se3^vii	3.526 (3)	Se5—Tl2^x	3.263 (3)
Tl3—Se6^vii	3.673 (3)	Se6—Se5^vii	2.365 (3)
Tl3—Se2	3.711 (3)	Se6—Nb1^v	2.594 (3)
Tl4—Se11	3.024 (3)	Se7—Se10	2.361 (3)
Tl4—Se11^i	3.099 (2)	Se8—Se9^i	2.373 (3)
Tl4—Se9^i	3.261 (3)	Se8—Nb2^i	2.584 (3)
Tl4—Se7	3.310 (3)	Se9—Se8^i	2.373 (3)
Tl4—Se7^vii	3.389 (3)	Se9—Tl4^i	3.261 (3)
Tl4—Se5	3.402 (3)	Se10—Se7	2.361 (3)
Tl4—Se8	3.536 (3)	Se10—Tl2^x	3.203 (3)
Tl4—Se6^vii	3.849 (3)	Se11—Nb2^i	2.437 (3)
Nb1—Se1	2.409 (2)	Se11—Tl4^i	3.099 (2)
Nb1—Se2^vii	2.568 (3)	Se11—Tl2^vi	3.274 (3)
Se1^i—Tl1—Se4^i	74.75 (6)	Se11^i—Tl4—Se5	98.80 (7)
Se1^i—Tl1—Se8^ii	86.60 (7)	Se9^i—Tl4—Se5	76.42 (7)
Se4^i—Tl1—Se8^ii	132.67 (6)	Se7—Tl4—Se5	110.33 (7)
Se1^i—Tl1—Se1^iii	90.27 (6)	Se7^vii—Tl4—Se5	84.31 (7)
Se4^i—Tl1—Se1^iii	106.93 (6)	Se11—Tl4—Se8	72.05 (6)
Se8^ii—Tl1—Se1^iii	116.43 (6)	Se11^i—Tl4—Se8	117.85 (6)
Se1^i—Tl1—Se9^iv	92.37 (7)	Se9^i—Tl4—Se8	40.61 (5)
Se4^i—Tl1—Se9^iv	166.54 (5)	Se7—Tl4—Se8	162.79 (5)
Se8^ii—Tl1—Se9^iv	40.38 (5)	Se7^vii—Tl4—Se8	77.94 (6)
Se1^iii—Tl1—Se9^iv	76.48 (6)	Se5—Tl4—Se8	80.72 (6)
Se1^i—Tl1—Se3^i	69.64 (6)	Se11—Tl4—Se6^vii	158.56 (6)
Se4^i—Tl1—Se3^i	61.94 (6)	Se11^i—Tl4—Se6^vii	114.66 (6)
Se8^ii—Tl1—Se3^i	70.84 (7)	Se9^i—Tl4—Se6^vii	112.55 (6)
Se1^iii—Tl1—Se3^i	158.69 (5)	Se7—Tl4—Se6^vii	81.82 (6)
Se9^iv—Tl1—Se3^i	110.30 (6)	Se7^vii—Tl4—Se6^vii	59.49 (6)
Se1^i—Tl1—Se2	148.13 (6)	Se5—Tl4—Se6^vii	37.43 (6)
Se4^i—Tl1—Se2	79.40 (7)	Se8—Tl4—Se6^vii	101.72 (6)
Se8^ii—Tl1—Se2	124.99 (7)	Se1—Nb1—Se2^vii	101.71 (8)
Se1^iii—Tl1—Se2	79.65 (6)	Se1—Nb1—Se6^x	104.79 (9)
Se9^iv—Tl1—Se2	114.06 (7)	Se2^vii—Nb1—Se6^x	133.18 (9)
Se3^i—Tl1—Se2	113.55 (6)	Se1—Nb1—Se5^viii	98.90 (8)
Se1^i—Tl1—Se3^iv	145.92 (6)	Se2^vii—Nb1—Se5^viii	84.29 (8)
Se4^i—Tl1—Se3^iv	124.45 (6)	Se6^x—Nb1—Se5^viii	54.10 (8)
Se8^ii—Tl1—Se3^iv	59.52 (6)	Se1—Nb1—Se4	96.04 (8)
Se1^iii—Tl1—Se3^iv	107.27 (6)	Se2^vii—Nb1—Se4	131.70 (8)
Se9^iv—Tl1—Se3^iv	64.96 (5)	Se6^x—Nb1—Se4	82.81 (9)
Se3^i—Tl1—Se3^iv	93.71 (7)	Se5^viii—Nb1—Se4	136.68 (9)
Se2—Tl1—Se3^iv	65.47 (7)	Se1—Nb1—Se3	95.64 (8)
Se1^i—Tl1—Se8	120.25 (6)	Se2^vii—Nb1—Se3	53.79 (7)
Se4^i—Tl1—Se8	59.19 (6)	Se6^x—Nb1—Se3	154.63 (8)
Se8^ii—Tl1—Se8	97.52 (6)	Se5^viii—Nb1—Se3	137.65 (9)
Se1^iii—Tl1—Se8	136.10 (5)	Se4—Nb1—Se3	80.19 (9)
Se9^iv—Tl1—Se8	127.40 (6)	Se1—Nb1—Se10	176.11 (8)
Se3^i—Tl1—Se8	56.42 (5)	Se2^vii—Nb1—Se10	81.77 (8)
Se2—Tl1—Se8	57.56 (6)	Se6^x—Nb1—Se10	73.63 (8)
Se3^iv—Tl1—Se8	65.73 (6)	Se5^viii—Nb1—Se10	83.10 (8)
Se4^i—Tl2—Se11	73.30 (6)	Se4—Nb1—Se10	80.27 (7)
Se4^i—Tl2—Se10^v	161.62 (5)	Se3—Nb1—Se10	85.00 (7)
Se11—Tl2—Se10^v	114.85 (6)	Se11^i—Nb2—Se7	102.07 (9)
Se4^i—Tl2—Se5^v	78.11 (7)	Se11^i—Nb2—Se7	102.07 (9)
Se11—Tl2—Se5^v	142.90 (6)	Se11^i—Nb2—Se8^i	101.20 (9)
Se10^v—Tl2—Se5^v	99.61 (7)	Se7—Nb2—Se8^i	133.74 (9)
Se4^i—Tl2—Se11^vi	92.43 (7)	Se7—Nb2—Se8^i	133.74 (9)
Se11—Tl2—Se11^vi	106.09 (6)	Se11^i—Nb2—Se9	101.62 (8)
Se10^v—Tl2—Se11^vi	69.70 (6)	Se7—Nb2—Se9	81.78 (9)
Se5^v—Tl2—Se11^vi	98.17 (6)	Se7—Nb2—Se9	81.78 (9)
Se4^i—Tl2—Se10^vii	113.05 (6)	Se8^i—Nb2—Se9	54.59 (8)
Se11—Tl2—Se10^vii	103.61 (7)	Se11^i—Nb2—Se4	93.23 (8)
Se10^v—Tl2—Se10^vii	81.91 (7)	Se7—Nb2—Se4	134.50 (8)
Se5^v—Tl2—Se10^vii	66.70 (6)	Se7—Nb2—Se4	134.50 (8)
Se11^vi—Tl2—Se10^vii	145.35 (6)	Se8^i—Nb2—Se4	82.89 (8)
Se4^i—Tl2—Se6	137.42 (6)	Se9—Nb2—Se4	136.76 (8)
Se11—Tl2—Se6	64.29 (6)	Se11^i—Nb2—Se10	92.83 (8)
Se10^v—Tl2—Se6	54.68 (5)	Se7—Nb2—Se10	53.64 (7)
Se5^v—Tl2—Se6	136.89 (5)	Se7—Nb2—Se10	53.64 (7)
Se11^vi—Tl2—Se6	102.37 (6)	Se8^i—Nb2—Se10	160.84 (8)
Se10^vii—Tl2—Se6	75.06 (6)	Se9—Nb2—Se10	135.19 (9)
Se5—Tl3—Se1^viii	73.98 (6)	Se4—Nb2—Se10	83.35 (8)
Se5—Tl3—Se1^viii	73.98 (6)	Se11^i—Nb2—Se3	169.29 (8)
Se5—Tl3—Se1^iv	75.01 (7)	Se7—Nb2—Se3	85.01 (8)
Se5—Tl3—Se1^iv	75.01 (7)	Se7—Nb2—Se3	85.01 (8)
Se1^viii—Tl3—Se1^iv	72.06 (6)	Se8^i—Nb2—Se3	78.92 (8)
Se5—Tl3—Se2^ix	144.92 (6)	Se9—Nb2—Se3	87.24 (8)
Se5—Tl3—Se2^ix	144.92 (6)	Se4—Nb2—Se3	76.12 (7)
Se1^viii—Tl3—Se2^ix	86.03 (6)	Se10—Nb2—Se3	84.88 (7)
Se1^iv—Tl3—Se2^ix	71.47 (6)	Nb1—Se1—Tl1^i	88.24 (7)
Se5—Tl3—Se8	85.57 (6)	Nb1—Se1—Tl3^viii	91.92 (7)
Se5—Tl3—Se8	85.57 (6)	Tl1^i—Se1—Tl3^viii	152.91 (7)
Se1^viii—Tl3—Se8	150.61 (6)	Nb1—Se1—Tl3^xi	95.04 (8)
Se1^iv—Tl3—Se8	82.52 (7)	Tl1^i—Se1—Tl3^xi	99.02 (7)
Se2^ix—Tl3—Se8	99.90 (6)	Tl3^viii—Se1—Tl3^xi	107.94 (6)
Se5—Tl3—Se7^vii	86.06 (7)	Se3^vii—Se2—Nb1^vii	64.59 (8)
Se5—Tl3—Se7^vii	86.06 (7)	Se2^vii—Se3—Nb1	61.62 (9)
Se1^viii—Tl3—Se7^vii	121.08 (6)	Se2^vii—Se3—Nb2	112.07 (9)
Se1^iv—Tl3—Se7^vii	153.19 (5)	Nb1—Se3—Nb2	81.09 (7)
Se2^ix—Tl3—Se7^vii	129.00 (6)	Nb1—Se4—Nb2	84.78 (8)
Se8—Tl3—Se7^vii	77.16 (7)	Nb1—Se4—Tl2^i	145.30 (8)
Se5—Tl3—Se3^vii	146.96 (6)	Nb2—Se4—Tl2^i	95.20 (7)
Se5—Tl3—Se3^vii	146.96 (6)	Nb1—Se4—Tl1^i	83.94 (7)
Se1^viii—Tl3—Se3^vii	112.76 (6)	Nb2—Se4—Tl1^i	107.09 (7)
Se1^iv—Tl3—Se3^vii	137.99 (6)	Tl2^i—Se4—Tl1^i	128.36 (7)
Se2^ix—Tl3—Se3^vii	67.46 (5)	Se6^vii—Se5—Nb1^viii	62.69 (8)
Se8—Tl3—Se3^vii	95.92 (6)	Se6^vii—Se5—Tl3	82.31 (9)
Se7^vii—Tl3—Se3^vii	62.39 (6)	Nb1^viii—Se5—Tl3	89.42 (7)
Se5—Tl3—Se6^vii	39.65 (5)	Se6^vii—Se5—Tl2^x	97.69 (9)
Se5—Tl3—Se6^vii	39.65 (5)	Nb1^viii—Se5—Tl2^x	107.37 (8)
Se1^viii—Tl3—Se6^vii	70.17 (6)	Tl3—Se5—Tl2^x	161.20 (7)
Se1^iv—Tl3—Se6^vii	110.59 (6)	Se5^vii—Se6—Nb1^v	63.21 (9)
Se2^ix—Tl3—Se6^vii	153.24 (5)	Se10—Se7—Nb2	65.56 (9)
Se8—Tl3—Se6^vii	106.84 (6)	Se9^i—Se8—Nb2^i	62.86 (8)
Se7^vii—Tl3—Se6^vii	60.25 (6)	Se8^i—Se9—Nb2	62.55 (8)
Se3^vii—Tl3—Se6^vii	109.98 (6)	Se8^i—Se9—Tl4^i	75.95 (8)
Se5—Tl3—Se2	137.20 (6)	Nb2—Se9—Tl4^i	84.32 (8)
Se5—Tl3—Se2	137.20 (6)	Se7—Se10—Nb2	60.80 (8)
Se1^viii—Tl3—Se2	147.56 (5)	Se7—Se10—Nb2	60.80 (8)
Se1^iv—Tl3—Se2	118.23 (6)	Se7—Se10—Nb1	114.03 (9)
Se2^ix—Tl3—Se2	70.51 (6)	Se7—Se10—Nb1	114.03 (9)
Se8—Tl3—Se2	58.87 (7)	Nb2—Se10—Nb1	80.10 (7)
Se7^vii—Tl3—Se2	64.74 (6)	Se7—Se10—Tl2^x	119.59 (8)
Se3^vii—Tl3—Se2	37.87 (5)	Se7—Se10—Tl2^x	119.59 (8)
Se6^vii—Tl3—Se2	124.99 (6)	Nb2—Se10—Tl2^x	94.80 (7)
Se11—Tl4—Se11^i	85.75 (7)	Nb1—Se10—Tl2^x	114.23 (8)
Se11—Tl4—Se9^i	76.57 (6)	Nb2^i—Se11—Tl4	92.29 (8)
Se11^i—Tl4—Se9^i	78.42 (6)	Nb2^i—Se11—Tl4^i	94.70 (8)
Se11—Tl4—Se7	98.46 (6)	Tl4—Se11—Tl4^i	94.25 (7)
Se11^i—Tl4—Se7	74.55 (6)	Nb2^i—Se11—Tl2	96.94 (8)
Se9^i—Tl4—Se7	152.82 (5)	Tl4—Se11—Tl2	109.54 (7)
Se11—Tl4—Se7^vii	99.08 (7)	Tl4^i—Se11—Tl2	152.95 (7)
Se11^i—Tl4—Se7^vii	164.17 (5)	Nb2^i—Se11—Tl2^vi	97.76 (7)
Se9^i—Tl4—Se7^vii	117.32 (6)	Tl4—Se11—Tl2^vi	168.94 (6)
Se7—Tl4—Se7^vii	89.79 (6)	Tl4^i—Se11—Tl2^vi	80.39 (7)
Se11—Tl4—Se5	151.06 (6)	Tl2—Se11—Tl2^vi	73.91 (6)

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