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Acta Cryst. (2012). E68, m1384    [ doi:10.1107/S160053681204295X ]

Dimethylbis(pyrazine-2-carboxylato-[kappa]2N1,O)tin(IV)

M. Vafaee, E. Najafi, M. M. Amini and S. W. Ng

Abstract top

In the title compound, [Sn(CH3)2(C5H3N2O2)2], the SnIV atom is twice N,O-chelated by two pyrazine-2-carboxylate ligands. The distorted six-coordination is completed by two tin-bound methyl C atoms. The C2N2O2 donor set defines a skewed trapezoidal-bipyramidal geometry. Intermolecular [pi]-[pi] interactions between the pyrazine rings [centroid-centroid distance = 3.8112 (13) Å] are observed.

Comment top

The reaction of appropriate amount of dimethyltin dichloride and pyrazine-2-carboxylic acid in dry methanol provided the title compound in good yield. The six-coordinated geometry around the SnIV atom is better described as skew-trapezoidal bipyramidal (Fig. 1, Table 1). Intermolecular π–π interactions between the pyrazine rings [centroid–centroid distance = 3.8112 (13) Å] stabilize the structure.

Related literature top

For background to organotin compounds, see: Dakternieks et al. (2003); Tiekink (1991); Yin et al. (2005).

Experimental top

Dimethyltin dichloride (0.22 g, 1 mmol) was treated with sodium methoxide (0.1 g, 2 mmol) in methanol (10 ml) to produce dimethyltin dimethoxide and sodium chloride. The sodium chloride precipitate was removed by filtration and then pyrazine-2-carboxylic acid (0.248 g, 2 mmol) in methanol (20 ml) was added to the filtrate. The solution was refluxed for 3 h. Evaporation of the solvent yielded a white solid, which was purified by recrystallization from methanol (yield: 70%. m.p.: 118–120°C).

Refinement top

H atoms were placed in calculated positions and refined as riding atoms, with C–H = 0.93 (CH) and 0.96 (CH3) Å and with Uiso(H) = 1.2(1.5 for methyl)Ueq(C). Omitted reflections owing to bad disagreement were (-9 10 6), (-6 13 3), (8 0 4), (2 0 8) and (-1 8 6).

Computing details top

Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).

Figures top
[Figure 1] Fig. 1. Molecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level.
Dimethylbis(pyrazine-2-carboxylato-κ2N1,O)tin(IV) top
Crystal data top
[Sn(CH3)2(C5H3N2O2)2]F(000) = 776
Mr = 394.95Dx = 1.863 Mg m−3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 5890 reflections
a = 9.2887 (6) Åθ = 2.3–28.3°
b = 12.3253 (7) ŵ = 1.84 mm−1
c = 12.6596 (7) ÅT = 295 K
β = 103.738 (1)°Prism, colorless
V = 1407.88 (14) Å30.40 × 0.40 × 0.20 mm
Z = 4
Data collection top
Bruker APEXII CCD
diffractometer		3193 independent reflections
Radiation source: fine-focus sealed tube2892 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.022
φ and ω scansθmax = 27.5°, θmin = 2.3°
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)		h = −12→11
Tmin = 0.527, Tmax = 0.710k = −16→13
8657 measured reflectionsl = −15→16
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.020Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.051H-atom parameters constrained
S = 1.06 w = 1/[σ2(Fo2) + (0.0201P)2 + 0.7349P]
where P = (Fo2 + 2Fc2)/3
3193 reflections(Δ/σ)max = 0.001
192 parametersΔρmax = 0.35 e Å−3
0 restraintsΔρmin = −0.47 e Å−3
Crystal data top
[Sn(CH3)2(C5H3N2O2)2]V = 1407.88 (14) Å3
Mr = 394.95Z = 4
Monoclinic, P21/cMo Kα radiation
a = 9.2887 (6) ŵ = 1.84 mm−1
b = 12.3253 (7) ÅT = 295 K
c = 12.6596 (7) Å0.40 × 0.40 × 0.20 mm
β = 103.738 (1)°
Data collection top
Bruker APEXII CCD
diffractometer		3193 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)		2892 reflections with I > 2σ(I)
Tmin = 0.527, Tmax = 0.710Rint = 0.022
8657 measured reflectionsθmax = 27.5°
Refinement top
R[F2 > 2σ(F2)] = 0.020H-atom parameters constrained
wR(F2) = 0.051Δρmax = 0.35 e Å−3
S = 1.06Δρmin = −0.47 e Å−3
3193 reflectionsAbsolute structure: ?
192 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Sn10.826212 (14)0.699389 (11)0.602141 (11)0.02943 (6)
O10.87907 (17)0.71196 (14)0.44616 (13)0.0415 (4)
O20.99121 (19)0.78275 (16)0.32619 (13)0.0493 (4)
O30.62830 (16)0.65997 (14)0.48535 (12)0.0374 (3)
O40.39196 (17)0.61066 (15)0.43503 (13)0.0469 (4)
N11.09601 (19)0.77904 (14)0.61292 (14)0.0320 (4)
N21.3488 (2)0.87890 (18)0.57415 (17)0.0478 (5)
N30.62453 (19)0.65022 (15)0.69497 (14)0.0340 (4)
N40.3759 (2)0.57674 (16)0.76062 (16)0.0421 (4)
C10.7815 (3)0.86219 (19)0.6305 (2)0.0466 (6)
H1A0.83460.90840.59180.070*
H1B0.81230.87720.70700.070*
H1C0.67700.87550.60570.070*
C20.9233 (3)0.54697 (19)0.6433 (2)0.0444 (5)
H2A1.00750.53910.61230.067*
H2B0.85230.49120.61550.067*
H2C0.95460.54080.72100.067*
C30.9857 (2)0.76167 (19)0.41998 (17)0.0346 (4)
C41.1116 (2)0.79754 (16)0.51203 (17)0.0302 (4)
C51.2359 (3)0.8484 (2)0.49323 (19)0.0405 (5)
H51.24090.86180.42190.049*
C61.3319 (3)0.86057 (19)0.67419 (19)0.0417 (5)
H61.40740.88120.73310.050*
C71.2068 (3)0.81211 (17)0.69396 (18)0.0361 (5)
H71.19960.80230.76540.043*
C120.6207 (3)0.6469 (2)0.79961 (18)0.0445 (6)
H120.70300.66960.85230.053*
C130.4970 (3)0.6103 (2)0.83094 (19)0.0449 (6)
H130.49860.60920.90470.054*
C140.3798 (2)0.58104 (18)0.65644 (18)0.0367 (5)
H140.29740.55770.60420.044*
C150.5024 (2)0.61905 (16)0.62266 (16)0.0295 (4)
C160.5045 (2)0.62962 (16)0.50495 (17)0.0321 (4)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Sn10.02845 (8)0.03258 (9)0.02919 (9)0.00030 (5)0.01068 (6)0.00025 (5)
O10.0333 (8)0.0637 (11)0.0291 (8)−0.0101 (7)0.0106 (6)−0.0007 (7)
O20.0415 (9)0.0830 (13)0.0266 (8)−0.0074 (8)0.0144 (7)0.0015 (8)
O30.0337 (8)0.0518 (9)0.0280 (7)−0.0071 (7)0.0097 (6)0.0015 (7)
O40.0346 (8)0.0667 (11)0.0359 (8)−0.0095 (8)0.0012 (7)−0.0012 (8)
N10.0310 (9)0.0379 (9)0.0296 (9)0.0011 (7)0.0123 (7)0.0020 (7)
N20.0421 (11)0.0589 (13)0.0449 (11)−0.0164 (9)0.0151 (9)−0.0052 (10)
N30.0278 (8)0.0442 (10)0.0309 (9)−0.0032 (7)0.0088 (7)−0.0047 (8)
N40.0380 (10)0.0471 (11)0.0464 (11)−0.0019 (8)0.0203 (9)0.0023 (9)
C10.0429 (13)0.0383 (12)0.0571 (15)0.0043 (10)0.0089 (11)−0.0073 (11)
C20.0437 (13)0.0380 (12)0.0511 (14)0.0060 (10)0.0104 (11)0.0047 (10)
C30.0303 (10)0.0456 (12)0.0303 (10)0.0039 (9)0.0119 (8)−0.0010 (9)
C40.0287 (10)0.0363 (10)0.0289 (10)0.0026 (8)0.0134 (8)−0.0002 (8)
C50.0397 (12)0.0510 (13)0.0353 (11)−0.0075 (10)0.0175 (9)0.0000 (10)
C60.0394 (12)0.0449 (13)0.0404 (12)−0.0090 (10)0.0082 (10)−0.0043 (10)
C70.0402 (12)0.0396 (11)0.0296 (11)0.0002 (9)0.0106 (9)−0.0006 (8)
C120.0348 (11)0.0687 (16)0.0308 (11)−0.0037 (11)0.0093 (9)−0.0065 (11)
C130.0424 (12)0.0627 (15)0.0338 (11)0.0054 (11)0.0171 (10)0.0010 (11)
C140.0301 (10)0.0415 (12)0.0399 (12)−0.0040 (9)0.0109 (9)−0.0025 (9)
C150.0276 (9)0.0286 (10)0.0333 (10)0.0016 (7)0.0091 (8)−0.0016 (8)
C160.0305 (10)0.0330 (10)0.0328 (10)−0.0004 (8)0.0079 (8)−0.0006 (8)
Geometric parameters (Å, º) top
Sn1—C12.097 (2)C1—H1A0.9600
Sn1—C22.095 (2)C1—H1B0.9600
Sn1—O12.1506 (16)C1—H1C0.9600
Sn1—O32.1238 (15)C2—H2A0.9600
Sn1—N12.6646 (18)C2—H2B0.9600
Sn1—N32.5107 (18)C2—H2C0.9600
O1—C31.274 (3)C3—C41.508 (3)
O2—C31.228 (3)C4—C51.383 (3)
O3—C161.288 (3)C5—H50.9300
O4—C161.221 (2)C6—C71.382 (3)
N1—C71.332 (3)C6—H60.9300
N1—C41.339 (3)C7—H70.9300
N2—C61.332 (3)C12—C131.378 (3)
N2—C51.334 (3)C12—H120.9300
N3—C121.334 (3)C13—H130.9300
N3—C151.334 (3)C14—C151.389 (3)
N4—C131.324 (3)C14—H140.9300
N4—C141.329 (3)C15—C161.501 (3)
C2—Sn1—C1154.98 (10)Sn1—C2—H2C109.5
C2—Sn1—O3102.62 (8)H2A—C2—H2C109.5
C1—Sn1—O399.44 (8)H2B—C2—H2C109.5
C2—Sn1—O196.58 (8)O2—C3—O1124.5 (2)
C1—Sn1—O1100.72 (9)O2—C3—C4118.9 (2)
O3—Sn1—O174.09 (6)O1—C3—C4116.63 (18)
C2—Sn1—N389.54 (8)N1—C4—C5121.7 (2)
C1—Sn1—N387.17 (9)N1—C4—C3116.59 (18)
O3—Sn1—N369.63 (6)C5—C4—C3121.71 (19)
O1—Sn1—N3143.67 (6)N2—C5—C4122.1 (2)
C2—Sn1—N188.49 (8)N2—C5—H5118.9
C1—Sn1—N182.01 (8)C4—C5—H5118.9
O3—Sn1—N1140.17 (5)N2—C6—C7122.7 (2)
O1—Sn1—N166.64 (6)N2—C6—H6118.7
N3—Sn1—N1149.56 (5)C7—C6—H6118.7
C3—O1—Sn1129.40 (14)N1—C7—C6121.4 (2)
C16—O3—Sn1126.66 (13)N1—C7—H7119.3
C7—N1—C4116.35 (18)C6—C7—H7119.3
C7—N1—Sn1134.17 (14)N3—C12—C13121.1 (2)
C4—N1—Sn1109.12 (13)N3—C12—H12119.5
C6—N2—C5115.7 (2)C13—C12—H12119.5
C12—N3—C15116.99 (19)N4—C13—C12122.8 (2)
C12—N3—Sn1132.12 (15)N4—C13—H13118.6
C15—N3—Sn1110.85 (13)C12—C13—H13118.6
C13—N4—C14115.86 (19)N4—C14—C15122.4 (2)
Sn1—C1—H1A109.5N4—C14—H14118.8
Sn1—C1—H1B109.5C15—C14—H14118.8
H1A—C1—H1B109.5N3—C15—C14120.76 (19)
Sn1—C1—H1C109.5N3—C15—C16116.52 (18)
H1A—C1—H1C109.5C14—C15—C16122.70 (18)
H1B—C1—H1C109.5O4—C16—O3124.5 (2)
Sn1—C2—H2A109.5O4—C16—C15119.47 (19)
Sn1—C2—H2B109.5O3—C16—C15116.07 (17)
H2A—C2—H2B109.5
C2—Sn1—O1—C3−98.1 (2)C7—N1—C4—C5−0.1 (3)
C1—Sn1—O1—C363.8 (2)Sn1—N1—C4—C5173.91 (17)
O3—Sn1—O1—C3160.6 (2)C7—N1—C4—C3−179.20 (18)
N3—Sn1—O1—C3163.69 (17)Sn1—N1—C4—C3−5.2 (2)
N1—Sn1—O1—C3−12.59 (18)O2—C3—C4—N1175.7 (2)
C2—Sn1—O3—C1683.58 (19)O1—C3—C4—N1−3.5 (3)
C1—Sn1—O3—C16−84.53 (19)O2—C3—C4—C5−3.4 (3)
O1—Sn1—O3—C16176.92 (19)O1—C3—C4—C5177.4 (2)
N3—Sn1—O3—C16−1.15 (17)C6—N2—C5—C4−2.2 (4)
N1—Sn1—O3—C16−173.35 (15)N1—C4—C5—N22.0 (4)
C2—Sn1—N1—C7−81.4 (2)C3—C4—C5—N2−178.9 (2)
C1—Sn1—N1—C775.4 (2)C5—N2—C6—C70.7 (4)
O3—Sn1—N1—C7170.55 (17)C4—N1—C7—C6−1.4 (3)
O1—Sn1—N1—C7−179.2 (2)Sn1—N1—C7—C6−173.53 (16)
N3—Sn1—N1—C75.1 (3)N2—C6—C7—N11.2 (4)
C2—Sn1—N1—C4106.05 (15)C15—N3—C12—C131.5 (4)
C1—Sn1—N1—C4−97.16 (15)Sn1—N3—C12—C13−175.99 (18)
O3—Sn1—N1—C4−1.98 (18)C14—N4—C13—C12−0.5 (4)
O1—Sn1—N1—C48.22 (13)N3—C12—C13—N40.0 (4)
N3—Sn1—N1—C4−167.44 (13)C13—N4—C14—C15−0.5 (3)
C2—Sn1—N3—C1277.7 (2)C12—N3—C15—C14−2.4 (3)
C1—Sn1—N3—C12−77.5 (2)Sn1—N3—C15—C14175.58 (16)
O3—Sn1—N3—C12−178.7 (2)C12—N3—C15—C16176.3 (2)
O1—Sn1—N3—C12178.2 (2)Sn1—N3—C15—C16−5.6 (2)
N1—Sn1—N3—C12−8.5 (3)N4—C14—C15—N32.0 (3)
C2—Sn1—N3—C15−99.93 (15)N4—C14—C15—C16−176.7 (2)
C1—Sn1—N3—C15104.88 (15)Sn1—O3—C16—O4177.83 (17)
O3—Sn1—N3—C153.72 (13)Sn1—O3—C16—C15−1.4 (3)
O1—Sn1—N3—C150.6 (2)N3—C15—C16—O4−174.2 (2)
N1—Sn1—N3—C15173.84 (12)C14—C15—C16—O44.6 (3)
Sn1—O1—C3—O2−164.70 (18)N3—C15—C16—O35.1 (3)
Sn1—O1—C3—C414.5 (3)C14—C15—C16—O3−176.11 (19)
Selected bond lengths (Å) top
Sn1—C12.097 (2)Sn1—O32.1238 (15)
Sn1—C22.095 (2)Sn1—N12.6646 (18)
Sn1—O12.1506 (16)Sn1—N32.5107 (18)
Acknowledgements top

We thank Shahid Beheshti University for supporting this study.

references
References top

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