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The title compound, [Sn(C10H21N2)(C6H18NSi2)], contains the SnII centre in a trigonal–pyramidal geometry. The basal plane is formed by three N atoms and the fourth apical position is occupied by a stereoactive lone pair. The Sn atom is displaced from the plane of the three N atoms by 1.1968 (12) Å. The Sn—N bonds are highly polarized toward the N atoms, as confirmed by natural bonding orbital analysis.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S0108270106001697/av1279sup1.cif
Contains datablocks global, II

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S0108270106001697/av1279IIsup2.hkl
Contains datablock II

CCDC reference: 603179

Comment top

The unsaturated N-heterocyclic divalent compounds of group 14 elements are key intermediates in many reactions (Arduengo, 1999; Gans-Eichler et al., 2002; Haaf et al., 2000; Hill & West, 2004; Hill et al., 2005; Naka et al., 2004; Tumanskii et al., 2004, 2005). The chemistry of the C, Si and Ge analogues has been explored (e.g. Haaf et al., 1998, 2000; Hill et al., 2005; Naka et al., 2004). However, the chemistry of the Sn congener has largely remained unknown. The first synthetic procedure for the preparation of 1,3-di-tert-butyl-2,3-dihydro-1H-[1,3,2]diazastannole, (I), was recently reported by Gans-Eichler et al. (2002) as a six-step synthesis. The experimental support for the proposed mechanism was based on detection of the title key intermediate, (II), by 1H NMR spectroscopy. In the course of our studies of the chemistry of (I), we reproduced its synthesis (Gans-Eichler et al., 2002) and successfully isolated and characterized the key intermediate, (II), thus obtaining direct evidence for the proposed mechanism. Here, we report the synthesis and structural and spectroscopic characterization of (II), and the results of our theoretical studies of a model analogue, (II-DFT).

Numerous attempts to prepare compound (I) in a toluene–hexane mixture and to isolate its crystals, as described by Gans-Eichler et al. (2002), were unsuccessful. We were able to obtain a sample of diazastannole (I) as a mixture with stannylene (II) in a 1:4 ratio only in the presence of HN(SiMe3)2, as suggested by the 1 NMR spectrum. Compound (I) is characterized by a remarkable thermal instability and decomposes at 333 K (Gans-Eichler et al., 2002). Our data suggest that the presence of some additives is necessary in order to promote the conversion of (II) into (I) and to improve the thermal stability of diazastannole (I). Additionally, preliminary density functional theory (DFT) studies of similar systems indicate that the conversion of (II) to (I) and appropriate byproducts is favoured by about 5 kcal mol−1 (1 kcal mol−1 = 4.184 kJ mol−1).

To ascertain fully the formation of (II) during the synthesis, its solid-state structure was established by single-crystal X-ray analysis. The molecular structure of (II) is shown in Fig. 1, and important bond distances and angles are presented in Table 1. Compound (II) crystallizes in a triclinic space group as discrete monomeric molecules with no intermolecular Sn···Sn or Sn···N interactions. The Sn centre is trigonal–pyramidal, with three N atoms in the basal plane and a stereochemically active lone pair in the fourth vertex. Atom Sn1 is displaced from the plane defined by atoms N1, N2, and N3 by 1.1968 (12) Å. Similar geometries have been reported for a number of SnII compounds [Cambridge Structural Database (CSD), Version?; Allen, 2002].

We have also performed a density functional theory (DFT) study of a model analogue of (II), (MeNHCH—CH2—NMe)Sn[N(SiH3)2], (II-DFT), using GAUSSIAN03 (Frisch et al., 2004) at different levels of theory and selected the PBE1PBE/SDD combination as the best. In 2000, Ayers et al. demonstrated that DFT methods produce reliable results for trigonal–pyramidal Ge and Sn systems similar to (II). The results of the geometry optimization and natural bonding orbital analysis (NBO; Weinhold, 2001) of (II-DFT) are discussed below.

In (II), the tert-butyl-{2-[(E)-tert-butylimino]ethyl}amine ligand coordinates to the Sn centre in an asymmetric four-electron σ-bonding k2-fashion, forming a five-membered heterocycle. The Sn1—N1 and Sn1—N2 distances to the bidentate ligand [2.278 (2) and 2.139 (2) Å, respectively] clearly demonstrate the distinction between formally dative and formally covalent bonds. However, such a dramatic difference is hardly expected based on the sum of the angles about atoms N1 and N2: atom N1 is sp2-hybridized [the sum of the angles about N1 is 358.6 (2)°] and atom N2 exhibits a slight sp3 character [the sum of the angles about N2 is 356.0 (2)°]. Both Sn—N distances fall in the expected range for single Sn—N bonds (Reference for standard values?). These observations are in accord with the theoretical findings for (II-DFT), in which the Sn1—N1 distance is 2.36 Å and Sn1—N2 = 2.12 Å. The distance to the third N atom, Sn1—N3 [2.150 (2) Å], is similar to Sn1—N2 and somewhat longer than the relevant Sn—N(SiMe3)2 distance of 2.08 (4) Å obtained by averaging the distances in eight compounds selected from the CSD based on rigorous search criteria. The corresponding value in (II-DFT) of 2.13 Å is in excellent agreement with the observed distance.

The NBO analysis suggests that compound (II-DFT) is highly ionic, with the Sn—N bonds strongly polarized toward the N atoms. The Sn lone pair is sp0.21-hybridized, indicating predominant s character, an observation in harmony with Bent's rule (Reference?). The ionic nature of this metal complex is also evident from the high natural charges: Sn1 1.32, N1 − 0.60, N2 − 0.98 and N3 − 1.72. The Sn1—N3 bond distance is not the shortest among the three Sn1—N bonds because atom N3 bears two SiH3 groups with an average positive charge of 0.48.

The five-membered heterocycle is in an envelope conformation, with Sn1 being the flip atom. Atom Sn1 is displaced from the plane defined by atoms N1/C5/C6/N2 by 0.383 (5) Å. The flip angle of the envelope, defined as the dihedral angle between the planes defined by atoms N1/C5/C6/N2 and N1/Sn1/N2 is 12.70 (19)°. In the theoretical model, (II-DFT), the five-membered ring is substantially more planar, with a small 0.07 Å displacement of Sn1 from the plane defined by N1/C5/C6/N2 and a 2.3° envelope-folding angle. Interestingly, the orientation of the Sn1—N3 vector relative to the plane of the heterocycle is different in (II) and (II-DFT). This is illustrated by the C5—(midpoint of bond C5—C6)—Sn1—N3 torsion angle. In (II), this angle is 89.1°, but in (II-DFT), the N(SiH3)2 substituent is considerably more tilted to the side of C5, at 79.7°.

The tert-butyl-{2-[(E)-tert-butylimino]ethyl}amide bite angle N1—Sn1—N2 in (II) spans 75.37 (8)°, a value typical of ligands forming five-membered rings with an Sn centre. This magnitude is in good agreement with the average of 18 angles in ten relevant Sn compounds found in the CSD [77 (3)°], and with the angle of 73.4° computed for (II-DFT). It is noteworthy that the other two N—Sn1—N angles in (II) average 100 (1)°, while in (II-DFT) they were much closer to a right angle [average 92.3 (5)°], corresponding to a small extent of orbital hybridization at the metal centre.

Finally, the solid-state structure of (II) exhibits some positional disorder: each methyl group at C4 is disordered over two positions in a 53:47 ratio.

Experimental top

The title stannylene, (II), was prepared according to the literature procedure of Gans-Eichler et al. (2002). Orange crystals of (II) suitable for X-ray analysis were obtained by recrystallization of the crude product from a small volume of hexane. Spectroscopic analysis: 1H NMR (C6D6, δ, p.p.m.): 0.45 (s, 18H, SiMe3), 1.04 (s, 9H, tert-Bu), 1.36 (s, 9H, tert-Bu), 3.82 [dd, 2J(H,H) = 25 Hz], 4.49 [dd, 2J(H,H) = 25 Hz], 7.31 (s, 1H, N CH); 13C{1H} NMR (C6D6, δ, p.p.m.): 6.85, 30.55, 31.64, 54.32, 59.08, 60.34, 172.45.

Refinement top

All H atoms were placed in idealized locations and refined as riding, with C—H = 0.95 Å and Uiso(H) = 1.2Ueq(C) for atom C5, C—H = 0.99 Å and Uiso(H) = 1.2Ueq(C) for atom C6, and C—H = 0.98 Å and Uiso(H) = 1.5Ueq(C) for methyl groups.

Computing details top

Data collection: SMART (Bruker, 2003); cell refinement: SAINT (Bruker, 2003); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Bruker, 2003); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.

Figures top
[Figure 1] Fig. 1. The molecular structure of (II). Displacement ellipsoids are drawn at the 50% probability level. The minor components of the disordered C atoms, and all H atoms except those on atoms C5 and C6, have been omitted for clarity.
{tert-Butyl[(E)-2-(tert-butylimino)ethyl]amido-k2N,N'} [bis(trimethylsilyl)amido-κN]tin(II) top
Crystal data top
[Sn(C10H21N2)(C3H9NSi)2]Z = 2
Mr = 448.37F(000) = 468
Triclinic, P1Dx = 1.304 Mg m3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 9.2875 (3) ÅCell parameters from 7833 reflections
b = 10.3056 (3) Åθ = 2.2–28.3°
c = 13.3897 (4) ŵ = 1.23 mm1
α = 81.468 (1)°T = 100 K
β = 85.416 (1)°Block, orange
γ = 64.270 (1)°0.39 × 0.34 × 0.23 mm
V = 1141.55 (6) Å3
Data collection top
Bruker SMART1000 CCD area-detector
diffractometer
5449 independent reflections
Radiation source: fine-focus sealed tube5137 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.015
0.30° ω scansθmax = 28.3°, θmin = 2.2°
Absorption correction: multi-scan
SADABS (Bruker, 2003)
h = 1212
Tmin = 0.646, Tmax = 0.766k = 1313
10674 measured reflectionsl = 1717
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)] = 0.031Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.080H-atom parameters constrained
S = 1.09 w = 1/[σ2(Fo2) + (0.0373P)2 + 1.7884P]
where P = (Fo2 + 2Fc2)/3
5449 reflections(Δ/σ)max = 0.001
207 parametersΔρmax = 2.38 e Å3
18 restraintsΔρmin = 1.36 e Å3
Crystal data top
[Sn(C10H21N2)(C3H9NSi)2]γ = 64.270 (1)°
Mr = 448.37V = 1141.55 (6) Å3
Triclinic, P1Z = 2
a = 9.2875 (3) ÅMo Kα radiation
b = 10.3056 (3) ŵ = 1.23 mm1
c = 13.3897 (4) ÅT = 100 K
α = 81.468 (1)°0.39 × 0.34 × 0.23 mm
β = 85.416 (1)°
Data collection top
Bruker SMART1000 CCD area-detector
diffractometer
5449 independent reflections
Absorption correction: multi-scan
SADABS (Bruker, 2003)
5137 reflections with I > 2σ(I)
Tmin = 0.646, Tmax = 0.766Rint = 0.015
10674 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.03118 restraints
wR(F2) = 0.080H-atom parameters constrained
S = 1.09Δρmax = 2.38 e Å3
5449 reflectionsΔρmin = 1.36 e Å3
207 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
xyzUiso*/UeqOcc. (<1)
Sn10.028703 (18)0.713095 (18)0.164792 (12)0.02073 (6)
Si10.34523 (8)0.76262 (7)0.10775 (5)0.01769 (13)
Si20.34167 (8)0.63405 (8)0.32425 (5)0.02181 (14)
N10.1289 (3)0.7970 (2)0.30162 (16)0.0241 (4)
N20.0318 (3)0.5227 (2)0.25555 (16)0.0207 (4)
N30.2529 (2)0.7000 (2)0.20843 (15)0.0182 (4)
C10.0866 (7)1.0028 (8)0.3275 (7)0.0380 (5)0.469 (8)
H1A0.02580.95010.38870.057*0.469 (8)
H1B0.13601.10720.33240.057*0.469 (8)
H1C0.01450.98310.26840.057*0.469 (8)
C20.3238 (9)1.0293 (8)0.2242 (5)0.0380 (5)0.469 (8)
H2A0.25681.03140.16420.057*0.469 (8)
H2B0.39651.12890.23550.057*0.469 (8)
H2C0.38620.97640.21400.057*0.469 (8)
C30.3302 (9)0.9773 (9)0.4105 (5)0.0380 (5)0.469 (8)
H3A0.41840.95350.39900.057*0.469 (8)
H3B0.37321.07920.42220.057*0.469 (8)
H3C0.27050.91470.46970.057*0.469 (8)
C1A0.1106 (7)1.0313 (6)0.2801 (6)0.0380 (5)0.531 (8)
H1A10.01020.98410.31700.057*0.531 (8)
H1A20.16621.13310.29240.057*0.531 (8)
H1A30.08771.02680.20760.057*0.531 (8)
C2A0.3619 (7)1.0181 (7)0.2454 (5)0.0380 (5)0.531 (8)
H2A10.32500.99490.17690.057*0.531 (8)
H2A20.41491.12370.24480.057*0.531 (8)
H2A30.43760.97690.26960.057*0.531 (8)
C3A0.2878 (9)0.9763 (8)0.4229 (4)0.0380 (5)0.531 (8)
H3A10.35220.92160.44050.057*0.531 (8)
H3A20.35551.07990.42530.057*0.531 (8)
H3A30.20120.94230.47130.057*0.531 (8)
C40.2171 (3)0.9529 (3)0.3166 (2)0.0380 (5)
C50.1613 (3)0.6975 (3)0.3557 (2)0.0222 (5)
H50.23600.72200.41040.027*
C60.0833 (3)0.5479 (3)0.3328 (2)0.0240 (5)
H6A0.03210.48370.39490.029*
H6B0.16620.52020.31410.029*
C70.0995 (3)0.3770 (3)0.22139 (19)0.0219 (5)
C80.0266 (4)0.3542 (3)0.1688 (3)0.0354 (7)
H8A0.11360.35870.21680.053*
H8B0.02230.25900.14440.053*
H8C0.06930.43030.11160.053*
C90.1672 (4)0.2578 (3)0.3111 (2)0.0348 (6)
H9A0.24590.27430.34550.052*
H9B0.21880.16280.28650.052*
H9C0.08020.26040.35840.052*
C100.2361 (3)0.3656 (3)0.1468 (2)0.0299 (6)
H10A0.19390.43660.08680.045*
H10B0.28750.26750.12700.045*
H10C0.31460.38540.17860.045*
C110.3205 (4)0.7033 (3)0.0133 (2)0.0304 (6)
H11A0.34810.59910.00260.046*
H11B0.39110.72260.06570.046*
H11C0.20920.75720.03470.046*
C120.2599 (4)0.9650 (3)0.0898 (2)0.0372 (7)
H12A0.14591.00540.07470.056*
H12B0.31590.99720.03350.056*
H12C0.27300.99880.15160.056*
C130.5670 (3)0.6935 (4)0.1198 (2)0.0324 (6)
H13A0.58990.71780.18290.049*
H13B0.60890.73880.06250.049*
H13C0.61800.58790.12020.049*
C140.4055 (4)0.7650 (3)0.3698 (2)0.0329 (6)
H14A0.47910.78480.32000.049*
H14B0.45940.72250.43450.049*
H14C0.31130.85580.37850.049*
C150.5194 (4)0.4533 (3)0.3217 (2)0.0374 (7)
H15A0.48380.38070.30890.056*
H15B0.57280.42350.38690.056*
H15C0.59420.46150.26800.056*
C160.2134 (4)0.6005 (5)0.4297 (2)0.0447 (9)
H16A0.12330.69270.44160.067*
H16B0.27660.55750.49110.067*
H16C0.17280.53380.41180.067*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Sn10.01591 (9)0.02862 (10)0.01527 (9)0.00829 (7)0.00088 (6)0.00071 (6)
Si10.0205 (3)0.0179 (3)0.0157 (3)0.0096 (2)0.0020 (2)0.0020 (2)
Si20.0240 (3)0.0318 (4)0.0149 (3)0.0175 (3)0.0023 (2)0.0004 (3)
N10.0254 (11)0.0201 (10)0.0218 (10)0.0049 (8)0.0028 (8)0.0049 (8)
N20.0236 (10)0.0174 (9)0.0219 (10)0.0100 (8)0.0062 (8)0.0047 (8)
N30.0174 (9)0.0215 (9)0.0162 (9)0.0097 (8)0.0005 (7)0.0002 (7)
C10.0401 (12)0.0249 (8)0.0438 (12)0.0097 (8)0.0099 (9)0.0081 (8)
C20.0401 (12)0.0249 (8)0.0438 (12)0.0097 (8)0.0099 (9)0.0081 (8)
C30.0401 (12)0.0249 (8)0.0438 (12)0.0097 (8)0.0099 (9)0.0081 (8)
C1A0.0401 (12)0.0249 (8)0.0438 (12)0.0097 (8)0.0099 (9)0.0081 (8)
C2A0.0401 (12)0.0249 (8)0.0438 (12)0.0097 (8)0.0099 (9)0.0081 (8)
C3A0.0401 (12)0.0249 (8)0.0438 (12)0.0097 (8)0.0099 (9)0.0081 (8)
C40.0401 (12)0.0249 (8)0.0438 (12)0.0097 (8)0.0099 (9)0.0081 (8)
C50.0174 (11)0.0228 (11)0.0252 (12)0.0078 (9)0.0050 (9)0.0052 (9)
C60.0199 (11)0.0265 (12)0.0283 (13)0.0116 (10)0.0028 (10)0.0080 (10)
C70.0209 (11)0.0193 (11)0.0251 (12)0.0079 (9)0.0015 (9)0.0049 (9)
C80.0264 (14)0.0290 (14)0.0523 (19)0.0087 (11)0.0037 (13)0.0177 (13)
C90.0367 (16)0.0223 (13)0.0347 (15)0.0045 (12)0.0016 (12)0.0006 (11)
C100.0274 (13)0.0262 (13)0.0351 (15)0.0102 (11)0.0079 (11)0.0094 (11)
C110.0376 (15)0.0428 (16)0.0188 (12)0.0251 (13)0.0060 (11)0.0059 (11)
C120.0528 (19)0.0218 (13)0.0339 (15)0.0153 (13)0.0087 (14)0.0014 (11)
C130.0243 (13)0.0486 (17)0.0272 (14)0.0186 (13)0.0050 (11)0.0062 (12)
C140.0378 (15)0.0440 (16)0.0265 (13)0.0245 (14)0.0004 (11)0.0112 (12)
C150.0402 (16)0.0306 (14)0.0363 (16)0.0108 (13)0.0202 (13)0.0069 (12)
C160.0442 (18)0.087 (3)0.0193 (13)0.0463 (19)0.0043 (12)0.0061 (15)
Geometric parameters (Å, º) top
Sn1—N22.139 (2)C3A—H3A20.9800
Sn1—N32.150 (2)C3A—H3A30.9800
Sn1—N12.278 (2)C5—C61.460 (3)
Si1—N31.734 (2)C5—H50.9500
Si1—C121.867 (3)C6—H6A0.9900
Si1—C131.876 (3)C6—H6B0.9900
Si1—C111.879 (3)C7—C101.524 (4)
Si2—N31.718 (2)C7—C81.531 (4)
Si2—C161.864 (3)C7—C91.536 (4)
Si2—C151.880 (3)C8—H8A0.9800
Si2—C141.882 (3)C8—H8B0.9800
N1—C51.295 (3)C8—H8C0.9800
N1—C41.490 (4)C9—H9A0.9800
N2—C61.394 (3)C9—H9B0.9800
N2—C71.482 (3)C9—H9C0.9800
C1—C41.532 (4)C10—H10A0.9800
C1—H1A0.9800C10—H10B0.9800
C1—H1B0.9800C10—H10C0.9800
C1—H1C0.9800C11—H11A0.9800
C2—C41.537 (4)C11—H11B0.9800
C2—H2A0.9800C11—H11C0.9800
C2—H2B0.9800C12—H12A0.9800
C2—H2C0.9800C12—H12B0.9800
C3—C41.550 (4)C12—H12C0.9800
C3—H3A0.9800C13—H13A0.9800
C3—H3B0.9800C13—H13B0.9800
C3—H3C0.9800C13—H13C0.9800
C1A—C41.539 (4)C14—H14A0.9800
C1A—H1A10.9800C14—H14B0.9800
C1A—H1A20.9800C14—H14C0.9800
C1A—H1A30.9800C15—H15A0.9800
C2A—C41.549 (4)C15—H15B0.9800
C2A—H2A10.9800C15—H15C0.9800
C2A—H2A20.9800C16—H16A0.9800
C2A—H2A30.9800C16—H16B0.9800
C3A—C41.527 (4)C16—H16C0.9800
C3A—H3A10.9800
N2—Sn1—N399.15 (8)C2A—C4—C390.8 (4)
N2—Sn1—N175.37 (8)N1—C5—C6120.1 (2)
N3—Sn1—N1101.21 (8)N1—C5—H5119.9
N3—Si1—C12111.27 (12)C6—C5—H5119.9
N3—Si1—C13114.48 (12)N2—C6—C5114.9 (2)
C12—Si1—C13106.95 (16)N2—C6—H6A108.5
N3—Si1—C11111.27 (11)C5—C6—H6A108.5
C12—Si1—C11107.83 (15)N2—C6—H6B108.5
C13—Si1—C11104.60 (13)C5—C6—H6B108.5
N3—Si2—C16115.78 (12)H6A—C6—H6B107.5
N3—Si2—C15111.76 (12)N2—C7—C10108.2 (2)
C16—Si2—C15104.11 (17)N2—C7—C8111.1 (2)
N3—Si2—C14111.55 (12)C10—C7—C8108.9 (2)
C16—Si2—C14103.84 (15)N2—C7—C9110.5 (2)
C15—Si2—C14109.22 (14)C10—C7—C9108.3 (2)
C5—N1—C4121.6 (2)C8—C7—C9109.8 (2)
C5—N1—Sn1112.02 (16)C7—C8—H8A109.5
C4—N1—Sn1124.96 (16)C7—C8—H8B109.5
C6—N2—C7116.6 (2)H8A—C8—H8B109.5
C6—N2—Sn1115.33 (16)C7—C8—H8C109.5
C7—N2—Sn1124.07 (16)H8A—C8—H8C109.5
Si2—N3—Si1121.19 (12)H8B—C8—H8C109.5
Si2—N3—Sn1127.69 (11)C7—C9—H9A109.5
Si1—N3—Sn1111.11 (10)C7—C9—H9B109.5
C4—C1—H1A109.5H9A—C9—H9B109.5
C4—C1—H1B109.5C7—C9—H9C109.5
C4—C1—H1C109.5H9A—C9—H9C109.5
C4—C2—H2A109.5H9B—C9—H9C109.5
C4—C2—H2B109.5C7—C10—H10A109.5
C4—C2—H2C109.5C7—C10—H10B109.5
C4—C3—H3A109.5H10A—C10—H10B109.5
C4—C3—H3B109.5C7—C10—H10C109.5
C4—C3—H3C109.5H10A—C10—H10C109.5
C4—C1A—H1A1109.5H10B—C10—H10C109.5
C4—C1A—H1A2109.5Si1—C11—H11A109.5
H1A1—C1A—H1A2109.5Si1—C11—H11B109.5
C4—C1A—H1A3109.5H11A—C11—H11B109.5
H1A1—C1A—H1A3109.5Si1—C11—H11C109.5
H1A2—C1A—H1A3109.5H11A—C11—H11C109.5
C4—C2A—H2A1109.5H11B—C11—H11C109.5
C4—C2A—H2A2109.5Si1—C12—H12A109.5
H2A1—C2A—H2A2109.5Si1—C12—H12B109.5
C4—C2A—H2A3109.5H12A—C12—H12B109.5
H2A1—C2A—H2A3109.5Si1—C12—H12C109.5
H2A2—C2A—H2A3109.5H12A—C12—H12C109.5
C4—C3A—H3A1109.5H12B—C12—H12C109.5
C4—C3A—H3A2109.5Si1—C13—H13A109.5
H3A1—C3A—H3A2109.5Si1—C13—H13B109.5
C4—C3A—H3A3109.5H13A—C13—H13B109.5
H3A1—C3A—H3A3109.5Si1—C13—H13C109.5
H3A2—C3A—H3A3109.5H13A—C13—H13C109.5
N1—C4—C3A113.5 (3)H13B—C13—H13C109.5
N1—C4—C1104.9 (3)Si2—C14—H14A109.5
C3A—C4—C195.9 (4)Si2—C14—H14B109.5
N1—C4—C2106.5 (3)H14A—C14—H14B109.5
C3A—C4—C2120.0 (4)Si2—C14—H14C109.5
C1—C4—C2114.9 (5)H14A—C14—H14C109.5
N1—C4—C1A109.1 (3)H14B—C14—H14C109.5
C3A—C4—C1A114.8 (4)Si2—C15—H15A109.5
C1—C4—C1A25.2 (3)Si2—C15—H15B109.5
C2—C4—C1A90.3 (4)H15A—C15—H15B109.5
N1—C4—C2A106.3 (3)Si2—C15—H15C109.5
C3A—C4—C2A105.6 (4)H15A—C15—H15C109.5
C1—C4—C2A130.4 (4)H15B—C15—H15C109.5
C2—C4—C2A17.9 (3)Si2—C16—H16A109.5
C1A—C4—C2A106.9 (4)Si2—C16—H16B109.5
N1—C4—C3113.0 (4)H16A—C16—H16B109.5
C3A—C4—C316.2 (4)Si2—C16—H16C109.5
C1—C4—C3111.0 (4)H16A—C16—H16C109.5
C2—C4—C3106.5 (4)H16B—C16—H16C109.5
C1A—C4—C3127.0 (4)
N2—Sn1—N1—C510.99 (18)C5—N1—C4—C3A25.5 (5)
N3—Sn1—N1—C5107.65 (19)Sn1—N1—C4—C3A169.3 (4)
N2—Sn1—N1—C4177.4 (2)C5—N1—C4—C1128.9 (4)
N3—Sn1—N1—C485.9 (2)Sn1—N1—C4—C165.9 (4)
N3—Sn1—N2—C6112.68 (18)C5—N1—C4—C2108.8 (4)
N1—Sn1—N2—C613.39 (17)Sn1—N1—C4—C256.4 (4)
N3—Sn1—N2—C790.74 (19)C5—N1—C4—C1A154.9 (4)
N1—Sn1—N2—C7170.0 (2)Sn1—N1—C4—C1A39.9 (4)
C16—Si2—N3—Si1170.04 (18)C5—N1—C4—C2A90.2 (4)
C15—Si2—N3—Si170.99 (18)Sn1—N1—C4—C2A75.0 (4)
C14—Si2—N3—Si151.60 (18)C5—N1—C4—C37.8 (5)
C16—Si2—N3—Sn111.7 (2)Sn1—N1—C4—C3173.0 (4)
C15—Si2—N3—Sn1107.26 (16)C4—N1—C5—C6174.2 (2)
C14—Si2—N3—Sn1130.15 (15)Sn1—N1—C5—C67.2 (3)
C12—Si1—N3—Si2100.64 (17)C7—N2—C6—C5172.7 (2)
C13—Si1—N3—Si220.75 (19)Sn1—N2—C6—C514.3 (3)
C11—Si1—N3—Si2139.08 (15)N1—C5—C6—N24.2 (4)
C12—Si1—N3—Sn180.84 (16)C6—N2—C7—C10173.1 (2)
C13—Si1—N3—Sn1157.77 (12)Sn1—N2—C7—C1030.6 (3)
C11—Si1—N3—Sn139.44 (15)C6—N2—C7—C867.4 (3)
N2—Sn1—N3—Si233.35 (15)Sn1—N2—C7—C888.9 (3)
N1—Sn1—N3—Si243.42 (15)C6—N2—C7—C954.7 (3)
N2—Sn1—N3—Si1145.05 (10)Sn1—N2—C7—C9148.96 (19)
N1—Sn1—N3—Si1138.18 (10)

Experimental details

Crystal data
Chemical formula[Sn(C10H21N2)(C3H9NSi)2]
Mr448.37
Crystal system, space groupTriclinic, P1
Temperature (K)100
a, b, c (Å)9.2875 (3), 10.3056 (3), 13.3897 (4)
α, β, γ (°)81.468 (1), 85.416 (1), 64.270 (1)
V3)1141.55 (6)
Z2
Radiation typeMo Kα
µ (mm1)1.23
Crystal size (mm)0.39 × 0.34 × 0.23
Data collection
DiffractometerBruker SMART1000 CCD area-detector
diffractometer
Absorption correctionMulti-scan
SADABS (Bruker, 2003)
Tmin, Tmax0.646, 0.766
No. of measured, independent and
observed [I > 2σ(I)] reflections
10674, 5449, 5137
Rint0.015
(sin θ/λ)max1)0.667
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.031, 0.080, 1.09
No. of reflections5449
No. of parameters207
No. of restraints18
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)2.38, 1.36

Computer programs: SMART (Bruker, 2003), SAINT (Bruker, 2003), SAINT, SHELXTL (Bruker, 2003), SHELXTL.

Selected geometric parameters (Å, º) top
Sn1—N22.139 (2)Si1—N31.734 (2)
Sn1—N32.150 (2)Si2—N31.718 (2)
Sn1—N12.278 (2)
N2—Sn1—N399.15 (8)N3—Sn1—N1101.21 (8)
N2—Sn1—N175.37 (8)
 

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