Dichloridobis(di-tert-butyl­methyl­phosphine oxide-κO)diphenyl­tin(IV)

Müller, M.; Lerner, H.-W.; Bolte, M.

doi:10.1107/S1600536808013809

metal-organic compounds

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ISSN: 2056-9890

Volume 64| Part 6| June 2008| Page m803

doi:10.1107/S1600536808013809

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Dichloridobis(di-tert-butylmethylphosphine oxide-κO)diphenyltin(IV)

Manuela Müller,^a Hans-Wolfram Lerner ^a and Michael Bolte ^a ^*

^aInstitut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/Main, Germany
^*Correspondence e-mail: bolte@chemie.uni-frankfurt.de

(Received 8 May 2008; accepted 8 May 2008; online 10 May 2008)

The complete molecule of the title compound, [Sn(C₆H₅)₂Cl₂(C₉H₂₁OP)₂], is generated by crystallographic inversion symmetry, the Sn atom is located on a special position of site symmetry $[\overline{1}]$ . The Sn atom adopts an all-trans SnC₂O₂Cl₂ octahedral geometry. As a consequence of the bulky substituents at the O atom, the P—O—Sn bond angle is 163.9 (3)°.

Related literature

For related literature, see: Lerner et al. (2005 ); Ruth et al. (2005 , 2007 ).

Experimental

Crystal data

[Sn(C₆H₅)₂Cl₂(C₉H₂₁OP)₂]
M_r = 696.25
Monoclinic, P 2₁ /c
a = 12.1782 (19) Å
b = 9.0866 (8) Å
c = 16.339 (2) Å
β = 111.518 (11)°
V = 1682.0 (4) Å³
Z = 2
Mo Kα radiation
μ = 1.04 mm⁻¹
T = 173 (2) K
0.13 × 0.09 × 0.07 mm

Data collection

Stoe IPDSII two-circle diffractometer
Absorption correction: multi-scan (MULABS; Spek, 2003 ; Blessing, 1995 ) T_min = 0.877, T_max = 0.931
11731 measured reflections
3145 independent reflections
1754 reflections with I > 2σ(I)
R_int = 0.087

Refinement

R[F² > 2σ(F²)] = 0.058
wR(F²) = 0.098
S = 0.88
3145 reflections
169 parameters
H-atom parameters constrained
Δρ_max = 0.44 e Å⁻³
Δρ_min = −0.83 e Å⁻³

Table 1
Selected bond lengths (Å)

Sn1—C41	2.128 (7)
Sn1—O1	2.232 (4)
Sn1—Cl1	2.5567 (16)

Data collection: X-AREA (Stoe & Cie, 2001 ); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL-Plus (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2003).

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536808013809/hb2731sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808013809/hb2731Isup2.hkl

checkCIF report

Comment top

We are interested in Lewis-acidic Sn(IV) compounds and their reactivity towards Lewis bases. Recently we have reported the synthesis and structure of {Zn[Sn(CH₂SMe)₄]0.5Cl₂}_n and Sn(CH₂PPh₂)₄ (Ruth et al., 2007). In contrast to [SnCl₄].[CH₃SCH₃]₂ which forms an adduct in solid state with a six-coordinated Sn atom (Ruth et al., 2005), the Sn(IV) centers in {Zn[Sn(CH₂SMe)₄]0.5Cl₂}_n and Sn(CH₂PPh₂)₄ are tetra-coordinated. However, Me₃SnCl forms an adduct with Me₃SnOH and H₂O in which the Sn atoms possess the coordination number five. It is interesting to note that this adduct represents an intermediate in Me₃SnCl hydrolysis (Lerner et al., 2005). We report here the X-ray crystal structure analysis of the title adduct [Ph₂SnCl₂].[tBu₂MePO]₂, (I). The synthesis of (I) was achieved by treatment of Ph₂SnCl₂ with two equivalents of tBu₂MePO as indicated in the equation below.

Compound (I) has crystallographic inversion symmetry with just half a molecule in the asymmetric unit. The Sn atom is hexacoordinated by three pairs of different ligands in an octahedral fashion (Table 1). All ligand pairs of the same kind are mutually trans at the Sn atom (Fig. 1). As a consequence of the bulky substituents at the O atom the P—O—Sn angle is enlarged to 163.9 (3)°.

Related literature top

For related literature, see: Lerner et al. (2005); Ruth et al. (2005, 2007).

Experimental top

tBu₂MePO (2.05 mmol) was added with stirring at ambient temperature to a solution of Ph₂SnCl₂ (0.58 mmol) in 25 ml THF. Colourless blocks of (I) were grown by storing this solution at room temperature for several weeks.

Computing details top

Data collection: X-AREA (Stoe & Cie, 2001); cell refinement: X-AREA (Stoe & Cie, 2001); data reduction: X-AREA (Stoe & Cie, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL-Plus (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2003).

Figures top

Fig. 1. Perspective view of (I) with displacement ellipsoids drawn at the 50% probability level; H atoms are omitted for clarity. Symmetry operator for generating equivalent atoms: (A) 1 - x, 1 - y, 1 - z.

Dichloridobis(di-tert-butylmethylphosphine oxide-κO)diphenyltin(IV) top

Crystal data top

[Sn(C₆H₅)₂Cl₂(C₉H₂₁OP)₂]	F(000) = 724
M_r = 696.25	D_x = 1.375 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 4261 reflections
a = 12.1782 (19) Å	θ = 3.5–25.4°
b = 9.0866 (8) Å	µ = 1.04 mm⁻¹
c = 16.339 (2) Å	T = 173 K
β = 111.518 (11)°	Block, colourless
V = 1682.0 (4) Å³	0.13 × 0.09 × 0.07 mm
Z = 2

Data collection top

Stoe IPDSII two-circle diffractometer	3145 independent reflections
Radiation source: fine-focus sealed tube	1754 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.087
ω scans	θ_max = 25.6°, θ_min = 3.4°
Absorption correction: multi-scan (MULABS; Spek, 2003; Blessing, 1995)	h = −14→14
T_min = 0.877, T_max = 0.931	k = −10→11
11731 measured reflections	l = −19→19

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)] = 0.058	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.098	H-atom parameters constrained
S = 0.88	w = 1/[σ²(F_o²) + (0.0102P)²] where P = (F_o² + 2F_c²)/3
3145 reflections	(Δ/σ)_max < 0.001
169 parameters	Δρ_max = 0.44 e Å⁻³
0 restraints	Δρ_min = −0.83 e Å⁻³

Crystal data top

[Sn(C₆H₅)₂Cl₂(C₉H₂₁OP)₂]	V = 1682.0 (4) Å³
M_r = 696.25	Z = 2
Monoclinic, P2₁/c	Mo Kα radiation
a = 12.1782 (19) Å	µ = 1.04 mm⁻¹
b = 9.0866 (8) Å	T = 173 K
c = 16.339 (2) Å	0.13 × 0.09 × 0.07 mm
β = 111.518 (11)°

Data collection top

Stoe IPDSII two-circle diffractometer	3145 independent reflections
Absorption correction: multi-scan (MULABS; Spek, 2003; Blessing, 1995)	1754 reflections with I > 2σ(I)
T_min = 0.877, T_max = 0.931	R_int = 0.087
11731 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.058	0 restraints
wR(F²) = 0.098	H-atom parameters constrained
S = 0.88	Δρ_max = 0.44 e Å⁻³
3145 reflections	Δρ_min = −0.83 e Å⁻³
169 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
Sn1	0.5000	0.5000	0.5000	0.02649 (18)
Cl1	0.46725 (18)	0.3097 (2)	0.60405 (11)	0.0361 (5)
P1	0.31774 (17)	0.7748 (2)	0.56073 (11)	0.0271 (4)
O1	0.3737 (4)	0.6468 (5)	0.5312 (3)	0.0300 (11)
C1	0.2236 (7)	0.7021 (8)	0.6188 (4)	0.0340 (17)
C2	0.2381 (6)	0.8878 (8)	0.4633 (4)	0.0337 (17)
C3	0.4234 (7)	0.8947 (8)	0.6369 (4)	0.0360 (18)
H3A	0.4684	0.8398	0.6903	0.054*
H3B	0.3822	0.9768	0.6521	0.054*
H3C	0.4774	0.9331	0.6100	0.054*
C11	0.3017 (7)	0.5921 (9)	0.6885 (5)	0.043 (2)
H11A	0.3721	0.6430	0.7282	0.064*
H11B	0.3257	0.5114	0.6589	0.064*
H11C	0.2568	0.5523	0.7225	0.064*
C12	0.1142 (8)	0.6241 (10)	0.5567 (5)	0.058 (3)
H12A	0.0656	0.6940	0.5126	0.086*
H12B	0.0686	0.5850	0.5903	0.086*
H12C	0.1380	0.5431	0.5273	0.086*
C13	0.1867 (8)	0.8238 (9)	0.6696 (5)	0.045 (2)
H13A	0.2574	0.8731	0.7101	0.068*
H13B	0.1428	0.7798	0.7031	0.068*
H13C	0.1366	0.8958	0.6279	0.068*
C21	0.1735 (8)	0.7857 (10)	0.3860 (5)	0.054 (2)
H21A	0.1137	0.7289	0.3994	0.081*
H21B	0.2303	0.7182	0.3762	0.081*
H21C	0.1351	0.8446	0.3329	0.081*
C22	0.3310 (6)	0.9731 (9)	0.4389 (4)	0.036 (2)
H22A	0.3744	1.0397	0.4871	0.054*
H22B	0.2916	1.0304	0.3853	0.054*
H22C	0.3862	0.9035	0.4288	0.054*
C23	0.1515 (7)	0.9993 (15)	0.4782 (5)	0.064 (3)
H23A	0.0918	0.9463	0.4938	0.096*
H23B	0.1128	1.0558	0.4242	0.096*
H23C	0.1950	1.0664	0.5261	0.096*
C41	0.3564 (7)	0.4098 (7)	0.3934 (4)	0.0276 (16)
C42	0.2454 (7)	0.3792 (8)	0.3993 (5)	0.0368 (18)
H42	0.2346	0.3983	0.4530	0.044*
C43	0.1523 (8)	0.3224 (9)	0.3291 (5)	0.049 (2)
H43	0.0771	0.3099	0.3334	0.059*
C44	0.1696 (8)	0.2832 (9)	0.2512 (5)	0.046 (2)
H44	0.1076	0.2388	0.2039	0.055*
C45	0.2763 (8)	0.3097 (9)	0.2440 (4)	0.042 (2)
H45	0.2876	0.2845	0.1912	0.051*
C46	0.3695 (7)	0.3738 (8)	0.3140 (4)	0.0347 (18)
H46	0.4424	0.3930	0.3074	0.042*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Sn1	0.0255 (4)	0.0305 (4)	0.0254 (3)	0.0007 (6)	0.0116 (3)	−0.0013 (5)
Cl1	0.0442 (12)	0.0352 (11)	0.0335 (9)	−0.0015 (10)	0.0198 (9)	0.0010 (8)
P1	0.0226 (11)	0.0324 (11)	0.0262 (8)	0.0000 (9)	0.0086 (8)	−0.0023 (8)
O1	0.031 (3)	0.029 (3)	0.033 (2)	0.006 (2)	0.015 (2)	−0.002 (2)
C1	0.032 (5)	0.037 (4)	0.036 (4)	−0.005 (4)	0.017 (3)	−0.010 (3)
C2	0.024 (4)	0.045 (5)	0.034 (4)	0.001 (4)	0.013 (3)	−0.003 (3)
C3	0.032 (5)	0.052 (5)	0.025 (3)	−0.003 (4)	0.012 (3)	0.000 (3)
C11	0.051 (6)	0.039 (5)	0.046 (4)	−0.005 (4)	0.027 (4)	0.004 (4)
C12	0.055 (6)	0.072 (7)	0.058 (5)	−0.030 (5)	0.034 (5)	−0.027 (5)
C13	0.048 (6)	0.052 (5)	0.046 (4)	−0.006 (5)	0.029 (4)	−0.003 (4)
C21	0.038 (5)	0.078 (7)	0.036 (4)	0.003 (5)	0.002 (4)	0.001 (4)
C22	0.034 (4)	0.040 (6)	0.039 (3)	0.015 (4)	0.018 (3)	0.009 (4)
C23	0.057 (6)	0.087 (6)	0.059 (4)	0.056 (8)	0.033 (4)	0.026 (7)
C41	0.036 (5)	0.021 (4)	0.021 (3)	0.000 (3)	0.004 (3)	−0.004 (3)
C42	0.024 (4)	0.047 (5)	0.043 (4)	−0.009 (4)	0.017 (4)	−0.013 (4)
C43	0.033 (5)	0.052 (6)	0.066 (5)	0.000 (5)	0.022 (4)	0.000 (4)
C44	0.036 (5)	0.041 (5)	0.048 (4)	−0.002 (4)	0.003 (4)	−0.006 (4)
C45	0.043 (5)	0.047 (5)	0.029 (4)	−0.004 (4)	0.004 (4)	0.001 (3)
C46	0.036 (5)	0.032 (5)	0.035 (4)	0.007 (4)	0.012 (4)	0.008 (3)

Geometric parameters (Å, º) top

Sn1—C41ⁱ	2.128 (7)	C12—H12C	0.9800
Sn1—C41	2.128 (7)	C13—H13A	0.9800
Sn1—O1	2.232 (4)	C13—H13B	0.9800
Sn1—O1ⁱ	2.232 (4)	C13—H13C	0.9800
Sn1—Cl1ⁱ	2.5567 (16)	C21—H21A	0.9800
Sn1—Cl1	2.5567 (16)	C21—H21B	0.9800
P1—O1	1.513 (4)	C21—H21C	0.9800
P1—C3	1.794 (7)	C22—H22A	0.9800
P1—C2	1.842 (7)	C22—H22B	0.9800
P1—C1	1.858 (7)	C22—H22C	0.9800
C1—C12	1.522 (10)	C23—H23A	0.9800
C1—C11	1.552 (10)	C23—H23B	0.9800
C1—C13	1.545 (9)	C23—H23C	0.9800
C2—C22	1.541 (10)	C41—C46	1.402 (8)
C2—C21	1.533 (11)	C41—C42	1.418 (10)
C2—C23	1.544 (11)	C42—C43	1.383 (10)
C3—H3A	0.9800	C42—H42	0.9500
C3—H3B	0.9800	C43—C44	1.412 (10)
C3—H3C	0.9800	C43—H43	0.9500
C11—H11A	0.9800	C44—C45	1.367 (11)
C11—H11B	0.9800	C44—H44	0.9500
C11—H11C	0.9800	C45—C46	1.409 (10)
C12—H12A	0.9800	C45—H45	0.9500
C12—H12B	0.9800	C46—H46	0.9500

C41ⁱ—Sn1—C41	180.0	C1—C12—H12B	109.5
C41ⁱ—Sn1—O1	90.6 (2)	H12A—C12—H12B	109.5
C41—Sn1—O1	89.4 (2)	C1—C12—H12C	109.5
C41ⁱ—Sn1—O1ⁱ	89.4 (2)	H12A—C12—H12C	109.5
C41—Sn1—O1ⁱ	90.6 (2)	H12B—C12—H12C	109.5
O1—Sn1—O1ⁱ	180.0	C1—C13—H13A	109.5
C41ⁱ—Sn1—Cl1ⁱ	90.10 (18)	C1—C13—H13B	109.5
C41—Sn1—Cl1ⁱ	89.90 (18)	H13A—C13—H13B	109.5
O1—Sn1—Cl1ⁱ	92.09 (12)	C1—C13—H13C	109.5
O1ⁱ—Sn1—Cl1ⁱ	87.91 (12)	H13A—C13—H13C	109.5
C41ⁱ—Sn1—Cl1	89.90 (18)	H13B—C13—H13C	109.5
C41—Sn1—Cl1	90.10 (18)	C2—C21—H21A	109.5
O1—Sn1—Cl1	87.91 (12)	C2—C21—H21B	109.5
O1ⁱ—Sn1—Cl1	92.09 (12)	H21A—C21—H21B	109.5
Cl1ⁱ—Sn1—Cl1	180.0	C2—C21—H21C	109.5
O1—P1—C3	113.3 (3)	H21A—C21—H21C	109.5
O1—P1—C2	108.0 (3)	H21B—C21—H21C	109.5
C3—P1—C2	106.1 (3)	C2—C22—H22A	109.5
O1—P1—C1	108.9 (3)	C2—C22—H22B	109.5
C3—P1—C1	106.4 (3)	H22A—C22—H22B	109.5
C2—P1—C1	114.3 (3)	C2—C22—H22C	109.5
P1—O1—Sn1	163.9 (3)	H22A—C22—H22C	109.5
C12—C1—C11	109.9 (7)	H22B—C22—H22C	109.5
C12—C1—C13	109.6 (6)	C2—C23—H23A	109.5
C11—C1—C13	106.7 (6)	C2—C23—H23B	109.5
C12—C1—P1	112.3 (4)	H23A—C23—H23B	109.5
C11—C1—P1	106.1 (5)	C2—C23—H23C	109.5
C13—C1—P1	112.0 (5)	H23A—C23—H23C	109.5
C22—C2—C21	107.1 (6)	H23B—C23—H23C	109.5
C22—C2—C23	108.7 (7)	C46—C41—C42	116.8 (7)
C21—C2—C23	110.7 (7)	C46—C41—Sn1	120.6 (5)
C22—C2—P1	107.5 (5)	C42—C41—Sn1	122.6 (5)
C21—C2—P1	108.9 (5)	C43—C42—C41	122.0 (6)
C23—C2—P1	113.8 (4)	C43—C42—H42	119.0
P1—C3—H3A	109.5	C41—C42—H42	119.0
P1—C3—H3B	109.5	C42—C43—C44	119.6 (7)
H3A—C3—H3B	109.5	C42—C43—H43	120.2
P1—C3—H3C	109.5	C44—C43—H43	120.2
H3A—C3—H3C	109.5	C45—C44—C43	119.6 (8)
H3B—C3—H3C	109.5	C45—C44—H44	120.2
C1—C11—H11A	109.5	C43—C44—H44	120.2
C1—C11—H11B	109.5	C44—C45—C46	120.7 (7)
H11A—C11—H11B	109.5	C44—C45—H45	119.6
C1—C11—H11C	109.5	C46—C45—H45	119.6
H11A—C11—H11C	109.5	C41—C46—C45	121.1 (7)
H11B—C11—H11C	109.5	C41—C46—H46	119.4
C1—C12—H12A	109.5	C45—C46—H46	119.4

C3—P1—O1—Sn1	−21.3 (11)	C1—P1—C2—C21	−79.8 (6)
C2—P1—O1—Sn1	95.9 (10)	O1—P1—C2—C23	165.5 (7)
C1—P1—O1—Sn1	−139.5 (9)	C3—P1—C2—C23	−72.7 (7)
C41ⁱ—Sn1—O1—P1	31.6 (10)	C1—P1—C2—C23	44.2 (8)
C41—Sn1—O1—P1	−148.4 (10)	O1—Sn1—C41—C46	142.0 (5)
Cl1ⁱ—Sn1—O1—P1	−58.5 (10)	O1ⁱ—Sn1—C41—C46	−38.0 (5)
Cl1—Sn1—O1—P1	121.5 (10)	Cl1ⁱ—Sn1—C41—C46	49.9 (5)
O1—P1—C1—C12	−69.5 (6)	Cl1—Sn1—C41—C46	−130.1 (5)
C3—P1—C1—C12	168.1 (6)	O1—Sn1—C41—C42	−39.9 (6)
C2—P1—C1—C12	51.4 (7)	O1ⁱ—Sn1—C41—C42	140.1 (6)
O1—P1—C1—C11	50.5 (5)	Cl1ⁱ—Sn1—C41—C42	−132.0 (6)
C3—P1—C1—C11	−71.9 (5)	Cl1—Sn1—C41—C42	48.0 (6)
C2—P1—C1—C11	171.4 (5)	C46—C41—C42—C43	−2.7 (11)
O1—P1—C1—C13	166.6 (5)	Sn1—C41—C42—C43	179.1 (6)
C3—P1—C1—C13	44.2 (6)	C41—C42—C43—C44	4.7 (12)
C2—P1—C1—C13	−72.5 (6)	C42—C43—C44—C45	−3.8 (12)
O1—P1—C2—C22	−74.1 (5)	C43—C44—C45—C46	0.8 (12)
C3—P1—C2—C22	47.7 (5)	C42—C41—C46—C45	−0.3 (10)
C1—P1—C2—C22	164.5 (5)	Sn1—C41—C46—C45	178.0 (6)
O1—P1—C2—C21	41.6 (6)	C44—C45—C46—C41	1.2 (12)
C3—P1—C2—C21	163.4 (5)

Symmetry code: (i) −x+1, −y+1, −z+1.

Experimental details

Crystal data
Chemical formula	[Sn(C₆H₅)₂Cl₂(C₉H₂₁OP)₂]
M_r	696.25
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	173
a, b, c (Å)	12.1782 (19), 9.0866 (8), 16.339 (2)
β (°)	111.518 (11)
V (Å³)	1682.0 (4)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.04
Crystal size (mm)	0.13 × 0.09 × 0.07

Data collection
Diffractometer	Stoe IPDSII two-circle diffractometer
Absorption correction	Multi-scan (MULABS; Spek, 2003; Blessing, 1995)
T_min, T_max	0.877, 0.931
No. of measured, independent and observed [I > 2σ(I)] reflections	11731, 3145, 1754
R_int	0.087
(sin θ/λ)_max (Å⁻¹)	0.608

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.058, 0.098, 0.88
No. of reflections	3145
No. of parameters	169
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.44, −0.83

Computer programs: X-AREA (Stoe & Cie, 2001), SHELXS97 (Sheldrick, 2008), XP in SHELXTL-Plus (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2003).

Selected bond lengths (Å) top

Sn1—C41	2.128 (7)	Sn1—Cl1	2.5567 (16)
Sn1—O1	2.232 (4)

References

Blessing, R. H. (1995). Acta Cryst. A51, 33–38. CrossRef CAS Web of Science IUCr Journals Google Scholar
Lerner, H.-W., Haghiri Ilkechi, A., Bolte, M. & Wagner, M. (2005). Z. Naturforsch. Teil B, 60, 413–415. CAS Google Scholar
Ruth, K., Lerner, H.-W. & Bolte, M. (2005). Acta Cryst. E61, m1852–m1853. Web of Science CSD CrossRef IUCr Journals Google Scholar
Ruth, K., Müller, M., Bolte, M., Bats, J. W., Wagner, M. & Lerner, H.-W. (2007). Z. Anorg. Allg. Chem. 633, 1485–1489. Web of Science CSD CrossRef CAS Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Spek, A. L. (2003). J. Appl. Cryst. 36, 7–13. Web of Science CrossRef CAS IUCr Journals Google Scholar
Stoe & Cie (2001). X-AREA. Stoe & Cie, Darmstadt, Germany. Google Scholar