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Acta Crystallogr Sect E Struct Rep Online. 2010 December 1; 66(Pt 12): m1621.
Published online 2010 November 20. doi:  10.1107/S1600536810047550
PMCID: PMC3011501

Tetra-μ3-tert-butano­lato-tetra­thallium(I)

Abstract

The title compound, [Tl4(C4H9O)4], featuring a (Tl—O)4 cube, crystallizes with a quarter-mol­ecule (located on a special position of site symmetry An external file that holds a picture, illustration, etc.
Object name is e-66-m1621-efi1.jpg..) and a half-mol­ecule (located on a special position of site symmetry 23.) in the asymmetric unit. The Tl—O bond distances range from 2.463 (12) to 2.506 (12) Å. All O—Tl—O bond angles are smaller than 90° whereas the Tl—O—Tl angles are wider than a recta­ngular angle.

Related literature

For the use of bulky silyl chalcogenolate ligands of the type ESiR 3 and alkyl chalcogenolates E(alk­yl) (E = O, S, Se, Te) with especially bulky alkoxides to stabilize transition metal centres, see: Wolczanski (2009 [triangle]); Kückmann et al. (2005 [triangle], 2008 [triangle], 2010 [triangle]). For substitution reactions of transition metal atoms, see: Kern et al. (2008 [triangle]); Lerner et al. (2002 [triangle], 2005 [triangle]). The title compound was prepared according to a slightly changed published procedure, see: Schmidbaur et al. (1968 [triangle]).

An external file that holds a picture, illustration, etc.
Object name is e-66-m1621-scheme1.jpg

Experimental

Crystal data

  • [Tl4(C4H9O)4]
  • M r = 1109.93
  • Cubic, An external file that holds a picture, illustration, etc.
Object name is e-66-m1621-efi2.jpg
  • a = 17.1500 (15) Å
  • V = 5044.2 (8) Å3
  • Z = 8
  • Mo Kα radiation
  • μ = 25.49 mm−1
  • T = 173 K
  • 0.21 × 0.18 × 0.10 mm

Data collection

  • Stoe IPDS II two-circle diffractometer
  • Absorption correction: multi-scan (MULABS; Spek, 2009 [triangle]; Blessing, 1995 [triangle]) T min = 0.075, T max = 0.185
  • 13612 measured reflections
  • 1489 independent reflections
  • 1226 reflections with I > 2σ(I)
  • R int = 0.084

Refinement

  • R[F 2 > 2σ(F 2)] = 0.042
  • wR(F 2) = 0.083
  • S = 1.00
  • 1489 reflections
  • 73 parameters
  • 6 restraints
  • H-atom parameters constrained
  • Δρmax = 1.77 e Å−3
  • Δρmin = −1.01 e Å−3
  • Absolute structure: Flack (1983 [triangle]), 711 Friedel pairs
  • Flack parameter: 0.00 (7)

Data collection: X-AREA (Stoe & Cie, 2001 [triangle]); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 [triangle]); molecular graphics: XP (Sheldrick, 2008 [triangle]); software used to prepare material for publication: SHELXL97.

Supplementary Material

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536810047550/kj2165sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536810047550/kj2165Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

supplementary crystallographic information

Comment

In a number of recent studies bulky silyl chalcogenolate ligands of the type ESiR3- and alkyl chalcogenolates E(alkyl)- (E = O, S, Se, Te) with especially bulky alkoxides have been used to stabilize transition metal centers (Wolczanski, 2009; Kückmann et al. 2005, 2008, 2010). In macromolecular chemistry, these ligands have also found application. Chalcogen-based ligands offer a variety of possible binding modes. Chalcogenolates are often found bridging two or more metal ions. Normally, transition metal complexes possess 6 e- thiolate ligands in a µ3-binding mode. Recently, however, we have shown that the anion of the mixed-valence Mn(I/II) complex Na(thf)6[(OC)3Mn(µ-SSitBu3)3MnSSitBu3] contains a terminal thiolate ligand with a linear Mn—S—Si unit (Kückmann et al. 2008). The prerequisite for six-electron donation (2 σ- and 4 π-electrons) comparable with Cp- is thus fulfilled. One approach is to create such complexes by substitution reactions of transition metal halogenides with alkali metal alkoxides as M+[OC(CH3)3]- or alkali metal siloxides M+[OSiR3]- (Kern et al. 2008; Lerner et al. 2005, 2002). In most cases the reactions that occur between alkali metal alkoxides and transition metal halides are not quantitative. Another approach to complexes with chalcogen coordination is to start from thallium alkoxides which react almost quantitatively with transition metal chlorides due to the poor solubility of TlCl. In this paper we report the synthesis and the crystal structure of [TlOtBu]4. The title compound [TlOtBu]4 was prepared according to a slightly changed published procedure (Schmidbaur et al. 1968), as shown in Fig. 2. The following modifications have been made in our approach: thallium ethoxide was used instead of thallium methoxide and potassium tert-butoxide was substituted for sodium tert-butoxide.

Experimental

In a flame-dried vial 1.1 ml thallium ethoxide (3.77 g, 15.1 mmol) was added to 1.70 g potassium tert-butoxide (15.1 mmol) in 50 ml benzene. After flame-sealing, the vial was heated to 80 °C for four days. The vial was opened, the crude reaction mixture filtered hot under an nitrogen atmosphere, the solid residue was washed with 20 ml benzene and the combined filtrates evaporated to dryness. The remaining colorless solid was suspended in ether and allowed to settle. A sample of the supernatant was transferred to a flame-dried Schlenk vessel and stored at -35°C. After two days colorless crystals of the composition [TlOtBu]4 deposited and were separated from the mother liquor (Yield 15%).

Refinement

H atoms were located in a difference map, but geometrically positioned and refined using a riding model with fixed individual displacement parameters [U(H) = 1.5 Ueq(C)] and with C—H = 0.98 Å.

Figures

Fig. 1.
Perspective view of one of the two independent molecules of the title compound with the atom numbering scheme for the symmetry independent atoms; displacement ellipsoids are at the 50% probability level; H atoms are omitted for clarity.
Fig. 2.
Preparation of the title compound.

Crystal data

[Tl4(C4H9O)4]Dx = 2.923 Mg m3
Mr = 1109.93Mo Kα radiation, λ = 0.71073 Å
Cubic, P43nCell parameters from 7201 reflections
Hall symbol: P -4n 2 3θ = 3.4–25.9°
a = 17.1500 (15) ŵ = 25.49 mm1
V = 5044.2 (8) Å3T = 173 K
Z = 8Plate, colourless
F(000) = 39040.21 × 0.18 × 0.10 mm

Data collection

Stoe IPDS II two-circle diffractometer1489 independent reflections
Radiation source: fine-focus sealed tube1226 reflections with I > 2σ(I)
graphiteRint = 0.084
ω scansθmax = 25.0°, θmin = 3.4°
Absorption correction: multi-scan (MULABS; Spek, 2009; Blessing, 1995)h = −18→20
Tmin = 0.075, Tmax = 0.185k = −19→20
13612 measured reflectionsl = −20→18

Refinement

Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.042H-atom parameters constrained
wR(F2) = 0.083w = 1/[σ2(Fo2) + (0.037P)2] where P = (Fo2 + 2Fc2)/3
S = 1.00(Δ/σ)max = 0.001
1489 reflectionsΔρmax = 1.77 e Å3
73 parametersΔρmin = −1.01 e Å3
6 restraintsAbsolute structure: Flack (1983), 711 Friedel pairs
Primary atom site location: structure-invariant direct methodsFlack parameter: 0.00 (7)

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 (Å2)

xyzUiso*/Ueq
Tl10.66760 (4)0.91953 (4)0.57229 (3)0.02168 (17)
O10.8130 (7)0.9310 (7)0.5635 (7)0.022 (2)
C10.8550 (13)0.8777 (10)0.6115 (13)0.029 (4)
C20.9386 (12)0.8950 (18)0.6078 (19)0.059 (8)
H2A0.94780.94850.62560.088*
H2B0.95690.88950.55390.088*
H2C0.96710.85860.64140.088*
C30.8400 (19)0.7958 (10)0.583 (2)0.059 (7)
H3A0.78390.78530.58440.089*
H3B0.86690.75880.61770.089*
H3C0.85960.79010.53010.089*
C40.8261 (16)0.8852 (14)0.6961 (12)0.041 (6)
H4A0.83680.93800.71530.061*
H4B0.85330.84720.72900.061*
H4C0.76980.87530.69800.061*
Tl1A0.42129 (4)0.42129 (4)0.42129 (4)0.0223 (2)
O1A0.5652 (6)0.4348 (6)0.4348 (6)0.020 (4)
C1A0.6118 (13)0.3882 (13)0.3882 (13)0.020 (7)
C2A0.6960 (12)0.3942 (13)0.4110 (14)0.035 (5)
H2A10.71250.44880.40860.053*
H2A20.72770.36310.37510.053*
H2A30.70270.37460.46430.053*

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
Tl10.0231 (3)0.0211 (3)0.0208 (3)−0.0047 (3)0.0036 (3)0.0011 (3)
O10.031 (6)0.020 (6)0.015 (6)0.005 (5)−0.005 (5)0.009 (5)
C10.036 (10)0.016 (9)0.034 (12)0.012 (8)−0.009 (9)0.003 (8)
C20.023 (10)0.065 (16)0.09 (2)0.006 (12)0.006 (13)0.040 (14)
C30.09 (2)0.007 (8)0.08 (2)0.007 (11)−0.018 (18)0.008 (12)
C40.063 (16)0.041 (13)0.019 (10)0.018 (11)0.007 (10)0.003 (8)
Tl1A0.0223 (2)0.0223 (2)0.0223 (2)−0.0035 (3)−0.0035 (3)−0.0035 (3)
O1A0.020 (4)0.020 (4)0.020 (4)0.005 (5)0.005 (5)−0.005 (5)
C1A0.020 (7)0.020 (7)0.020 (7)0.003 (8)0.003 (8)−0.003 (8)
C2A0.025 (8)0.041 (8)0.041 (9)0.011 (6)0.007 (7)−0.010 (7)

Geometric parameters (Å, °)

Tl1—O1i2.463 (12)C4—H4A0.9800
Tl1—O1ii2.493 (11)C4—H4B0.9800
Tl1—O12.506 (12)C4—H4C0.9800
O1—C11.42 (2)Tl1A—O1A2.490 (8)
O1—Tl1ii2.463 (12)Tl1A—O1Aiii2.490 (8)
O1—Tl1i2.492 (11)Tl1A—O1Aiv2.490 (8)
C1—C21.47 (3)O1A—C1A1.38 (4)
C1—C31.51 (3)O1A—Tl1Aiii2.490 (8)
C1—C41.54 (3)O1A—Tl1Aiv2.490 (8)
C2—H2A0.9800C1A—C2Av1.50 (2)
C2—H2B0.9800C1A—C2Avi1.50 (2)
C2—H2C0.9800C1A—C2A1.50 (2)
C3—H3A0.9800C2A—H2A10.9800
C3—H3B0.9800C2A—H2A20.9800
C3—H3C0.9800C2A—H2A30.9800
O1i—Tl1—O1ii81.0 (4)H3B—C3—H3C109.5
O1i—Tl1—O178.3 (4)C1—C4—H4A109.5
O1ii—Tl1—O177.8 (4)C1—C4—H4B109.5
O1i—Tl1—Tl1vii41.8 (3)H4A—C4—H4B109.5
O1ii—Tl1—Tl1vii41.2 (3)C1—C4—H4C109.5
O1—Tl1—Tl1vii84.3 (2)H4A—C4—H4C109.5
C1—O1—Tl1ii119.7 (10)H4B—C4—H4C109.5
C1—O1—Tl1i119.3 (11)O1A—Tl1A—O1Aiii78.9 (6)
Tl1ii—O1—Tl1i97.0 (4)O1A—Tl1A—O1Aiv78.9 (6)
C1—O1—Tl1114.7 (11)O1Aiii—Tl1A—O1Aiv78.9 (6)
Tl1ii—O1—Tl1101.8 (4)C1A—O1A—Tl1Aiii117.7 (11)
Tl1i—O1—Tl1101.0 (4)C1A—O1A—Tl1Aiv117.7 (11)
O1—C1—C2109.8 (17)Tl1Aiii—O1A—Tl1Aiv100.1 (5)
O1—C1—C3109.2 (17)C1A—O1A—Tl1A117.7 (11)
C2—C1—C3110 (2)Tl1Aiii—O1A—Tl1A100.1 (5)
O1—C1—C4109.1 (16)Tl1Aiv—O1A—Tl1A100.1 (5)
C2—C1—C4110 (2)O1A—C1A—C2Av111.4 (15)
C3—C1—C4109 (2)O1A—C1A—C2Avi111.4 (15)
C1—C2—H2A109.5C2Av—C1A—C2Avi107.4 (16)
C1—C2—H2B109.5O1A—C1A—C2A111.4 (15)
H2A—C2—H2B109.5C2Av—C1A—C2A107.4 (16)
C1—C2—H2C109.5C2Avi—C1A—C2A107.4 (16)
H2A—C2—H2C109.5C1A—C2A—H2A1109.5
H2B—C2—H2C109.5C1A—C2A—H2A2109.5
C1—C3—H3A109.5H2A1—C2A—H2A2109.5
C1—C3—H3B109.5C1A—C2A—H2A3109.5
H3A—C3—H3B109.5H2A1—C2A—H2A3109.5
C1—C3—H3C109.5H2A2—C2A—H2A3109.5
H3A—C3—H3C109.5
O1i—Tl1—O1—C1−137.9 (13)Tl1—O1—C1—C4−53.8 (18)
O1ii—Tl1—O1—C1139.0 (13)O1Aiii—Tl1A—O1A—C1A139.7 (13)
Tl1vii—Tl1—O1—C1−179.8 (12)O1Aiv—Tl1A—O1A—C1A−139.7 (13)
O1i—Tl1—O1—Tl1ii91.4 (5)O1Aiii—Tl1A—O1A—Tl1Aiii10.8 (5)
O1ii—Tl1—O1—Tl1ii8.2 (4)O1Aiv—Tl1A—O1A—Tl1Aiii91.49 (15)
Tl1vii—Tl1—O1—Tl1ii49.5 (3)O1Aiii—Tl1A—O1A—Tl1Aiv−91.49 (15)
O1i—Tl1—O1—Tl1i−8.2 (4)O1Aiv—Tl1A—O1A—Tl1Aiv−10.8 (5)
O1ii—Tl1—O1—Tl1i−91.4 (5)Tl1Aiii—O1A—C1A—C2Av68.4 (10)
Tl1vii—Tl1—O1—Tl1i−50.1 (3)Tl1Aiv—O1A—C1A—C2Av−171.6 (10)
Tl1ii—O1—C1—C2−53 (2)Tl1A—O1A—C1A—C2Av−51.6 (10)
Tl1i—O1—C1—C266 (2)Tl1Aiii—O1A—C1A—C2Avi−171.6 (10)
Tl1—O1—C1—C2−174.2 (19)Tl1Aiv—O1A—C1A—C2Avi−51.6 (10)
Tl1ii—O1—C1—C3−173.5 (18)Tl1A—O1A—C1A—C2Avi68.4 (10)
Tl1i—O1—C1—C3−55 (2)Tl1Aiii—O1A—C1A—C2A−51.6 (10)
Tl1—O1—C1—C365 (2)Tl1Aiv—O1A—C1A—C2A68.4 (10)
Tl1ii—O1—C1—C467.6 (19)Tl1A—O1A—C1A—C2A−171.6 (10)
Tl1i—O1—C1—C4−173.7 (14)

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

Footnotes

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: KJ2165).

References

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