metal-organic compounds
(tert-Butylimido)bis(η5-cyclopentadienyl)pyridinezirconium(IV)
aLeibniz-Institut für Katalyse e. V. an der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany
*Correspondence e-mail: katharina.kaleta@catalysis.de
The title compound, [Zr(C5H5)2(C4H9N)(C5H5N)], was obtained from the reaction of (C5H5)2Zr(py)(η2-Me3SiC2SiMe3) (py is pyridine) and tBuN=C=NtBu alongside the formation of (C5H5)2Zr(CNtBu)(η2-Me3SiC2SiMe3). The zirconium atom is coordinated in a distorted tetrahedral geometry by two cyclopentadienyl ligands, a pyridine ligand, and a tert-butylimido ligand via a Zr=N double bond. The tert-butyl group is disordered over two positions in a 0.634 (5):0.366 (5) ratio.
Related literature
For other metallocene complexes (C5H5)CpM(L)(NtBu) (Cp = C5H5, C5Me5; M = Ti, L = py; M = Zr, L = py, thf (thf is tetrahydrofuran), exo-norbornene oxide) with an M=N double bond, see: Blum et al. (2003, 2005); Dunn et al. (1997); Krska et al. (1998); Walsh et al. (1988, 1993); Zuckerman et al. (2000). For the structure of (rac-ebthi)Zr(py)(NtBu) (ebthi = ethylenebis(η5-tetrahydroindenyl)), see: Hoyt et al. (2004). For the preparation of the starting material (C5H5)2Zr(py)(η2-Me3SiC2SiMe3), see: Rosenthal et al. (1995). For the characterization of the by-product (C5H5)2Zr(CNtBu)(η2-Me3SiC2SiMe3) of the above-described reaction, see: Bach et al. (2007).
Experimental
Crystal data
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Data collection: X-AREA (Stoe & Cie, 2005); cell 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 (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536810033556/im2220sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810033556/im2220Isup2.hkl
To a solution of 235 mg (0.5 mmol) (C5H5)2Zr(py)(η2-Me3SiC2SiMe3) in 10 ml of n-hexane was added dropwise 0.1 ml (0.5 mmol) of tBuN=C=NtBu. The reaction mixture was allowed to stand for 16 h. During this period the solution turned red and yellow crystals were formed which were isolated, washed with cold n-hexane and dried in vacuo. Yield: 46% (85 mg, 0.229 mmol).
All H atoms were placed in idealized positions with d(C—H) = 0.98 (CH3) and 0.95 Å (CH) and refined using a riding model with Uiso(H) fixed at 1.5 Ueq(C) for CH3 and 1.2 Ueq(C) for CH.
We studied the reaction of several η2-Me3SiC2SiMe3) (M = Ti, Zr) to synthesize and characterize new metallacycles with heteroatoms. In this case the reaction revealed a C—N bond cleavage which resulted in two products. Additionally to (C5H5)2Zr(py)(NtBu) the complex (C5H5)2Zr(CNtBu)(η2-Me3SiC2SiMe3) was found which was described by Bach et al. (2007).
with metallocene precursors as (C5H5)2M(The title compound consists of a zirconium center coordinated by two cyclopentadienyl ligands, a stabilizing pyridine and a tert-butyl imido ligand. The geometry at the zirconium atom is distorted tetrahedral (main deviations from the expected value of 109.47° are obtained in N1—Zr1—N2 95.64 (6)° and Cp—Zr1—Cp 123.9°). Bond lengths and angles can be compared to the thf stabilized complex (C5H5)2Zr(thf)(NtBu) described by Walsh et al. (1993). The bond lengths Zr1—N1 with 1.843 (2) Å and N1—C1 with 1.434 (3) Å are not significantly different compared to those of (C5H5)2Zr(thf)(NtBu) (Zr—N 1.826 (4) and N—C 1.449 (6) Å). In the title compound the Zr1—N1—C1 angle of 168.93 (13)° is about 5° smaller than the corresponding angle found for the almost linear tert-butyl imido ligand in (C5H5)2Zr(thf)(NtBu).
For other metallocene complexes (C5H5)CpM(L)(NtBu) (Cp = C5H5, C5Me5; M = Ti, L = py; M = Zr, L = py, thf, exo-norbornene oxide) with an M═N double bond, see: Blum et al. (2003, 2005); Dunn et al. (1997); Krska et al. (1998); Walsh et al. (1988, 1993); Zuckerman et al. (2000). For the structure of (rac-ebthi)Zr(py)(NtBu) (ebthi = ethylenebis(η5-tetrahydroindenyl)), see: Hoyt et al. (2004). For the preparation of the starting material (C5H5)2Zr(py)(η2-Me3SiC2SiMe3), see: Rosenthal et al. (1995). For the reaction of the starting material with see: Bach et al. (2007).
Data collection: X-AREA (Stoe & Cie, 2005); cell
X-AREA (Stoe & Cie, 2005); data reduction: X-AREA (Stoe & Cie, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. Molecular structure of the title compound showing the atom-labelling scheme. Hydrogen atoms are omitted for clarity. Thermal ellipsoids are drawn at the 30% probability level. |
[Zr(C5H5)2(C4H9N)(C5H5N)] | F(000) = 768 |
Mr = 371.62 | Dx = 1.339 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 11751 reflections |
a = 9.3946 (2) Å | θ = 2.0–29.6° |
b = 13.6156 (4) Å | µ = 0.60 mm−1 |
c = 14.4126 (3) Å | T = 200 K |
V = 1843.56 (8) Å3 | Prism, yellow |
Z = 4 | 0.50 × 0.50 × 0.35 mm |
Stoe IPDS II diffractometer | 4990 independent reflections |
Radiation source: fine-focus sealed tube | 4752 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.025 |
ω scans | θmax = 29.2°, θmin = 2.1° |
Absorption correction: numerical (X-SHAPE and X-RED32; Stoe & Cie, 2005) | h = −12→12 |
Tmin = 0.730, Tmax = 0.896 | k = −18→18 |
35444 measured reflections | l = −19→19 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.023 | H-atom parameters constrained |
wR(F2) = 0.059 | w = 1/[σ2(Fo2) + (0.043P)2 + 0.044P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max = 0.001 |
4990 reflections | Δρmax = 0.45 e Å−3 |
181 parameters | Δρmin = −0.38 e Å−3 |
16 restraints | Absolute structure: Flack (1983), 2169 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: −0.03 (4) |
[Zr(C5H5)2(C4H9N)(C5H5N)] | V = 1843.56 (8) Å3 |
Mr = 371.62 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 9.3946 (2) Å | µ = 0.60 mm−1 |
b = 13.6156 (4) Å | T = 200 K |
c = 14.4126 (3) Å | 0.50 × 0.50 × 0.35 mm |
Stoe IPDS II diffractometer | 4990 independent reflections |
Absorption correction: numerical (X-SHAPE and X-RED32; Stoe & Cie, 2005) | 4752 reflections with I > 2σ(I) |
Tmin = 0.730, Tmax = 0.896 | Rint = 0.025 |
35444 measured reflections |
R[F2 > 2σ(F2)] = 0.023 | H-atom parameters constrained |
wR(F2) = 0.059 | Δρmax = 0.45 e Å−3 |
S = 1.03 | Δρmin = −0.38 e Å−3 |
4990 reflections | Absolute structure: Flack (1983), 2169 Friedel pairs |
181 parameters | Absolute structure parameter: −0.03 (4) |
16 restraints |
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. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
C2A | −0.0298 (4) | 0.5132 (4) | 0.2054 (4) | 0.0710 (13)* | 0.634 (5) |
H2A1 | −0.0198 | 0.5691 | 0.2477 | 0.107* | 0.634 (5) |
H2A2 | −0.1118 | 0.4734 | 0.2241 | 0.107* | 0.634 (5) |
H2A3 | −0.0441 | 0.5373 | 0.1420 | 0.107* | 0.634 (5) |
C3A | 0.1191 (6) | 0.4163 (4) | 0.3089 (2) | 0.0765 (14)* | 0.634 (5) |
H3A1 | 0.1243 | 0.4733 | 0.3502 | 0.115* | 0.634 (5) |
H3A2 | 0.2062 | 0.3772 | 0.3152 | 0.115* | 0.634 (5) |
H3A3 | 0.0366 | 0.3760 | 0.3256 | 0.115* | 0.634 (5) |
C4A | 0.0964 (5) | 0.3633 (3) | 0.1445 (3) | 0.0690 (13)* | 0.634 (5) |
H4A1 | 0.1846 | 0.3253 | 0.1493 | 0.103* | 0.634 (5) |
H4A2 | 0.0841 | 0.3862 | 0.0806 | 0.103* | 0.634 (5) |
H4A3 | 0.0155 | 0.3219 | 0.1620 | 0.103* | 0.634 (5) |
C2B | 0.0023 (10) | 0.4490 (9) | 0.1272 (6) | 0.095 (3)* | 0.366 (5) |
H2B1 | 0.0528 | 0.4262 | 0.0717 | 0.143* | 0.366 (5) |
H2B2 | −0.0348 | 0.5153 | 0.1162 | 0.143* | 0.366 (5) |
H2B3 | −0.0769 | 0.4044 | 0.1408 | 0.143* | 0.366 (5) |
C3B | 0.0215 (10) | 0.4865 (7) | 0.2929 (5) | 0.081 (3)* | 0.366 (5) |
H3B1 | −0.0046 | 0.5556 | 0.2843 | 0.122* | 0.366 (5) |
H3B2 | 0.0806 | 0.4799 | 0.3486 | 0.122* | 0.366 (5) |
H3B3 | −0.0650 | 0.4470 | 0.3001 | 0.122* | 0.366 (5) |
C4B | 0.1428 (12) | 0.3436 (3) | 0.2234 (6) | 0.078 (2)* | 0.366 (5) |
H4B1 | 0.1974 | 0.3200 | 0.1700 | 0.117* | 0.366 (5) |
H4B2 | 0.0556 | 0.3047 | 0.2297 | 0.117* | 0.366 (5) |
H4B3 | 0.2003 | 0.3370 | 0.2798 | 0.117* | 0.366 (5) |
C1 | 0.1041 (2) | 0.45092 (16) | 0.20903 (15) | 0.0500 (5) | |
C15 | 0.6237 (2) | 0.54813 (15) | 0.02869 (15) | 0.0469 (4) | |
H15 | 0.6509 | 0.6142 | 0.0403 | 0.056* | |
C16 | 0.7109 (3) | 0.49094 (19) | −0.02490 (19) | 0.0627 (7) | |
H16 | 0.7964 | 0.5172 | −0.0498 | 0.075* | |
C17 | 0.6736 (3) | 0.39523 (18) | −0.04233 (19) | 0.0737 (9) | |
H17 | 0.7332 | 0.3538 | −0.0784 | 0.088* | |
C18 | 0.5476 (3) | 0.36108 (19) | −0.00621 (19) | 0.0722 (9) | |
H18 | 0.5181 | 0.2955 | −0.0181 | 0.087* | |
C19 | 0.4643 (3) | 0.42177 (15) | 0.04710 (15) | 0.0493 (5) | |
H19 | 0.3776 | 0.3970 | 0.0717 | 0.059* | |
N1 | 0.22557 (16) | 0.51038 (11) | 0.18718 (11) | 0.0361 (3) | |
N2 | 0.50127 (18) | 0.51501 (12) | 0.06570 (11) | 0.0383 (3) | |
Zr1 | 0.363638 (15) | 0.605190 (11) | 0.172085 (11) | 0.03033 (5) | |
C5 | 0.16807 (18) | 0.72069 (14) | 0.12010 (16) | 0.0645 (8) | |
H5 | 0.0771 | 0.7076 | 0.1462 | 0.077* | |
C6 | 0.2709 (2) | 0.78328 (13) | 0.15691 (17) | 0.0720 (9) | |
H6 | 0.2625 | 0.8204 | 0.2125 | 0.086* | |
C7 | 0.3884 (2) | 0.78188 (13) | 0.09794 (17) | 0.0748 (9) | |
H7 | 0.4741 | 0.8179 | 0.1062 | 0.090* | |
C8 | 0.3582 (2) | 0.71844 (15) | 0.02469 (14) | 0.0712 (8) | |
H8 | 0.4197 | 0.7036 | −0.0257 | 0.085* | |
C9 | 0.2220 (2) | 0.68063 (15) | 0.03839 (14) | 0.0680 (8) | |
H9 | 0.1743 | 0.6355 | −0.0011 | 0.082* | |
C10 | 0.5757 (3) | 0.54733 (18) | 0.27310 (18) | 0.0803 (10) | |
H10 | 0.6232 | 0.4895 | 0.2532 | 0.096* | |
C11 | 0.4565 (3) | 0.5510 (2) | 0.32905 (16) | 0.0944 (12) | |
H11 | 0.4076 | 0.4961 | 0.3544 | 0.113* | |
C12 | 0.4209 (3) | 0.6485 (3) | 0.34173 (13) | 0.0959 (13) | |
H12 | 0.3431 | 0.6724 | 0.3773 | 0.115* | |
C13 | 0.5180 (3) | 0.7050 (2) | 0.29362 (17) | 0.0829 (10) | |
H13 | 0.5188 | 0.7747 | 0.2903 | 0.099* | |
C14 | 0.6137 (2) | 0.64251 (19) | 0.25120 (15) | 0.0731 (8) | |
H14 | 0.6919 | 0.6616 | 0.2136 | 0.088* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0409 (11) | 0.0494 (12) | 0.0596 (12) | −0.0060 (8) | 0.0131 (9) | 0.0040 (9) |
C15 | 0.0433 (10) | 0.0462 (10) | 0.0513 (11) | 0.0066 (9) | 0.0127 (9) | 0.0041 (8) |
C16 | 0.0615 (14) | 0.0656 (15) | 0.0611 (14) | 0.0170 (12) | 0.0308 (12) | 0.0123 (12) |
C17 | 0.099 (2) | 0.0582 (14) | 0.0644 (15) | 0.0300 (15) | 0.0443 (14) | 0.0062 (13) |
C18 | 0.116 (2) | 0.0389 (11) | 0.0612 (15) | 0.0142 (13) | 0.0411 (16) | −0.0014 (10) |
C19 | 0.0687 (14) | 0.0346 (10) | 0.0447 (11) | 0.0026 (8) | 0.0199 (10) | 0.0011 (7) |
N1 | 0.0355 (7) | 0.0365 (7) | 0.0364 (8) | 0.0017 (6) | 0.0066 (6) | 0.0008 (6) |
N2 | 0.0418 (8) | 0.0357 (8) | 0.0374 (8) | 0.0065 (6) | 0.0085 (6) | 0.0022 (6) |
Zr1 | 0.02958 (7) | 0.03000 (7) | 0.03142 (7) | 0.00527 (6) | 0.00094 (6) | −0.00138 (6) |
C5 | 0.0433 (12) | 0.0566 (14) | 0.093 (2) | 0.0242 (10) | 0.0149 (11) | 0.0296 (13) |
C6 | 0.0713 (16) | 0.0367 (11) | 0.108 (3) | 0.0212 (11) | 0.0257 (16) | 0.0057 (13) |
C7 | 0.0670 (17) | 0.0398 (11) | 0.118 (3) | 0.0089 (11) | 0.0268 (17) | 0.0228 (14) |
C8 | 0.0676 (14) | 0.0726 (16) | 0.0735 (16) | 0.0295 (14) | 0.0231 (15) | 0.0402 (14) |
C9 | 0.0630 (15) | 0.0719 (17) | 0.0690 (17) | 0.0214 (13) | −0.0124 (13) | 0.0270 (14) |
C10 | 0.0732 (19) | 0.095 (2) | 0.0723 (19) | 0.0222 (17) | −0.0423 (17) | −0.0064 (17) |
C11 | 0.104 (3) | 0.127 (3) | 0.0521 (15) | −0.015 (2) | −0.0394 (19) | 0.020 (2) |
C12 | 0.086 (2) | 0.163 (4) | 0.0385 (14) | 0.002 (2) | −0.0050 (13) | −0.0307 (18) |
C13 | 0.081 (2) | 0.092 (2) | 0.0749 (19) | −0.0029 (18) | −0.0192 (16) | −0.0435 (18) |
C14 | 0.0516 (15) | 0.101 (2) | 0.0671 (16) | −0.0002 (13) | −0.0210 (12) | −0.0239 (15) |
C2A—C1 | 1.518 (3) | C19—N2 | 1.343 (3) |
C2A—H2A1 | 0.9800 | C19—H19 | 0.9500 |
C2A—H2A2 | 0.9800 | N1—Zr1 | 1.8428 (16) |
C2A—H2A3 | 0.9800 | N2—Zr1 | 2.3517 (16) |
C3A—C1 | 1.521 (3) | Zr1—C5 | 2.5318 (16) |
C3A—H3A1 | 0.9800 | Zr1—C11 | 2.534 (2) |
C3A—H3A2 | 0.9800 | Zr1—C9 | 2.5570 (17) |
C3A—H3A3 | 0.9800 | Zr1—C12 | 2.5719 (19) |
C4A—C1 | 1.514 (3) | Zr1—C6 | 2.5857 (17) |
C4A—H4A1 | 0.9800 | Zr1—C10 | 2.590 (2) |
C4A—H4A2 | 0.9800 | Zr1—C8 | 2.6255 (17) |
C4A—H4A3 | 0.9800 | Zr1—C7 | 2.6428 (17) |
C2B—C1 | 1.519 (3) | Zr1—C13 | 2.649 (2) |
C2B—H2B1 | 0.9800 | Zr1—C14 | 2.6602 (19) |
C2B—H2B2 | 0.9800 | C5—C6 | 1.3933 |
C2B—H2B3 | 0.9800 | C5—C9 | 1.3933 |
C3B—C1 | 1.516 (3) | C5—H5 | 0.9500 |
C3B—H3B1 | 0.9800 | C6—C7 | 1.3933 |
C3B—H3B2 | 0.9800 | C6—H6 | 0.9500 |
C3B—H3B3 | 0.9800 | C7—C8 | 1.3933 |
C4B—C1 | 1.519 (3) | C7—H7 | 0.9500 |
C4B—H4B1 | 0.9800 | C8—C9 | 1.3933 |
C4B—H4B2 | 0.9800 | C8—H8 | 0.9500 |
C4B—H4B3 | 0.9800 | C9—H9 | 0.9500 |
C1—N1 | 1.434 (3) | C10—C11 | 1.3807 |
C15—N2 | 1.346 (3) | C10—C14 | 1.3807 |
C15—C16 | 1.369 (3) | C10—H10 | 0.9500 |
C15—H15 | 0.9500 | C11—C12 | 1.3807 |
C16—C17 | 1.373 (3) | C11—H11 | 0.9500 |
C16—H16 | 0.9500 | C12—C13 | 1.3807 |
C17—C18 | 1.374 (3) | C12—H12 | 0.9500 |
C17—H17 | 0.9500 | C13—C14 | 1.3807 |
C18—C19 | 1.373 (3) | C13—H13 | 0.9500 |
C18—H18 | 0.9500 | C14—H14 | 0.9500 |
C1—C2A—H2A1 | 109.5 | C5—Zr1—C10 | 155.98 (8) |
C1—C2A—H2A2 | 109.5 | C9—Zr1—C10 | 161.08 (8) |
H2A1—C2A—H2A2 | 109.5 | C12—Zr1—C10 | 51.29 (7) |
C1—C2A—H2A3 | 109.5 | C6—Zr1—C10 | 126.29 (8) |
H2A1—C2A—H2A3 | 109.5 | N1—Zr1—C8 | 119.55 (7) |
H2A2—C2A—H2A3 | 109.5 | N2—Zr1—C8 | 77.87 (6) |
C1—C3A—H3A1 | 109.5 | C5—Zr1—C8 | 51.80 (6) |
C1—C3A—H3A2 | 109.5 | C11—Zr1—C8 | 154.14 (8) |
H3A1—C3A—H3A2 | 109.5 | C12—Zr1—C8 | 129.69 (9) |
C1—C3A—H3A3 | 109.5 | C6—Zr1—C8 | 51.26 (6) |
H3A1—C3A—H3A3 | 109.5 | C10—Zr1—C8 | 130.42 (8) |
H3A2—C3A—H3A3 | 109.5 | N1—Zr1—C7 | 138.37 (7) |
C1—C4A—H4A1 | 109.5 | N2—Zr1—C7 | 99.39 (6) |
C1—C4A—H4A2 | 109.5 | C5—Zr1—C7 | 51.60 (6) |
H4A1—C4A—H4A2 | 109.5 | C11—Zr1—C7 | 126.55 (9) |
C1—C4A—H4A3 | 109.5 | C9—Zr1—C7 | 51.36 (6) |
H4A1—C4A—H4A3 | 109.5 | C12—Zr1—C7 | 99.06 (10) |
H4A2—C4A—H4A3 | 109.5 | C10—Zr1—C7 | 115.87 (8) |
C1—C2B—H2B1 | 109.5 | N1—Zr1—C13 | 131.80 (8) |
C1—C2B—H2B2 | 109.5 | N2—Zr1—C13 | 113.45 (7) |
H2B1—C2B—H2B2 | 109.5 | C5—Zr1—C13 | 105.91 (8) |
C1—C2B—H2B3 | 109.5 | C11—Zr1—C13 | 51.00 (7) |
H2B1—C2B—H2B3 | 109.5 | C9—Zr1—C13 | 125.24 (8) |
H2B2—C2B—H2B3 | 109.5 | C6—Zr1—C13 | 76.06 (8) |
C1—C3B—H3B1 | 109.5 | C10—Zr1—C13 | 50.46 (7) |
C1—C3B—H3B2 | 109.5 | C8—Zr1—C13 | 104.14 (9) |
H3B1—C3B—H3B2 | 109.5 | C7—Zr1—C13 | 75.64 (9) |
C1—C3B—H3B3 | 109.5 | N1—Zr1—C14 | 134.81 (8) |
H3B1—C3B—H3B3 | 109.5 | N2—Zr1—C14 | 83.90 (7) |
H3B2—C3B—H3B3 | 109.5 | C5—Zr1—C14 | 130.47 (7) |
C1—C4B—H4B1 | 109.5 | C11—Zr1—C14 | 50.87 (7) |
C1—C4B—H4B2 | 109.5 | C9—Zr1—C14 | 134.89 (8) |
H4B1—C4B—H4B2 | 109.5 | C12—Zr1—C14 | 50.52 (7) |
C1—C4B—H4B3 | 109.5 | C6—Zr1—C14 | 98.89 (7) |
H4B1—C4B—H4B3 | 109.5 | C8—Zr1—C14 | 104.58 (8) |
H4B2—C4B—H4B3 | 109.5 | C7—Zr1—C14 | 85.50 (8) |
N1—C1—C4A | 110.4 (2) | C6—C5—C9 | 108.0 |
N1—C1—C3B | 113.7 (4) | C6—C5—Zr1 | 76.34 (7) |
C4A—C1—C3B | 135.8 (5) | C9—C5—Zr1 | 75.11 (6) |
N1—C1—C2A | 109.7 (2) | C6—C5—H5 | 126.0 |
C4A—C1—C2A | 112.3 (3) | C9—C5—H5 | 126.0 |
C3B—C1—C2A | 54.9 (4) | Zr1—C5—H5 | 114.8 |
N1—C1—C2B | 109.9 (5) | C7—C6—C5 | 108.0 |
C4A—C1—C2B | 58.6 (5) | C7—C6—Zr1 | 76.82 (6) |
C3B—C1—C2B | 107.6 (6) | C5—C6—Zr1 | 72.08 (7) |
C2A—C1—C2B | 57.3 (5) | C7—C6—H6 | 126.0 |
N1—C1—C4B | 112.5 (4) | C5—C6—H6 | 126.0 |
C4A—C1—C4B | 48.5 (4) | Zr1—C6—H6 | 117.1 |
C3B—C1—C4B | 108.7 (6) | C8—C7—C6 | 108.0 |
C2A—C1—C4B | 137.7 (5) | C8—C7—Zr1 | 73.98 (6) |
C2B—C1—C4B | 103.9 (6) | C6—C7—Zr1 | 72.29 (6) |
N1—C1—C3A | 108.0 (3) | C8—C7—H7 | 126.0 |
C4A—C1—C3A | 109.9 (3) | C6—C7—H7 | 126.0 |
C3B—C1—C3A | 52.6 (4) | Zr1—C7—H7 | 119.6 |
C2A—C1—C3A | 106.4 (3) | C7—C8—C9 | 108.0 |
C2B—C1—C3A | 142.0 (5) | C7—C8—Zr1 | 75.35 (7) |
C4B—C1—C3A | 63.3 (4) | C9—C8—Zr1 | 71.71 (6) |
N2—C15—C16 | 123.0 (2) | C7—C8—H8 | 126.0 |
N2—C15—H15 | 118.5 | C9—C8—H8 | 126.0 |
C16—C15—H15 | 118.5 | Zr1—C8—H8 | 118.8 |
C15—C16—C17 | 119.4 (2) | C8—C9—C5 | 108.0 |
C15—C16—H16 | 120.3 | C8—C9—Zr1 | 77.14 (7) |
C17—C16—H16 | 120.3 | C5—C9—Zr1 | 73.11 (7) |
C16—C17—C18 | 118.2 (2) | C8—C9—H9 | 126.0 |
C16—C17—H17 | 120.9 | C5—C9—H9 | 126.0 |
C18—C17—H17 | 120.9 | Zr1—C9—H9 | 115.9 |
C19—C18—C17 | 119.9 (2) | C11—C10—C14 | 108.0 |
C19—C18—H18 | 120.0 | C11—C10—Zr1 | 72.15 (8) |
C17—C18—H18 | 120.0 | C14—C10—Zr1 | 77.58 (9) |
N2—C19—C18 | 122.2 (2) | C11—C10—H10 | 126.0 |
N2—C19—H19 | 118.9 | C14—C10—H10 | 126.0 |
C18—C19—H19 | 118.9 | Zr1—C10—H10 | 116.3 |
C1—N1—Zr1 | 168.93 (13) | C10—C11—C12 | 108.0 |
C19—N2—C15 | 117.30 (17) | C12—C11—Zr1 | 75.82 (9) |
C19—N2—Zr1 | 118.78 (14) | C10—C11—H11 | 126.0 |
C15—N2—Zr1 | 123.60 (14) | C12—C11—H11 | 126.0 |
N1—Zr1—N2 | 95.64 (6) | Zr1—C11—H11 | 113.9 |
N1—Zr1—C5 | 87.67 (7) | C13—C12—C11 | 108.0 |
N2—Zr1—C5 | 122.03 (7) | C13—C12—Zr1 | 77.79 (8) |
N1—Zr1—C11 | 86.16 (8) | C11—C12—Zr1 | 72.82 (9) |
N2—Zr1—C11 | 103.93 (9) | C13—C12—H12 | 126.0 |
C5—Zr1—C11 | 134.01 (9) | C11—C12—H12 | 126.0 |
N1—Zr1—C9 | 90.23 (7) | Zr1—C12—H12 | 115.5 |
N2—Zr1—C9 | 90.26 (6) | C12—C13—C14 | 108.0 |
N1—Zr1—C12 | 101.27 (8) | C12—C13—Zr1 | 71.59 (8) |
N2—Zr1—C12 | 128.65 (8) | C14—C13—Zr1 | 75.37 (7) |
C5—Zr1—C12 | 106.90 (9) | C12—C13—H13 | 126.0 |
C9—Zr1—C12 | 137.15 (9) | C14—C13—H13 | 126.0 |
N1—Zr1—C6 | 115.46 (7) | Zr1—C13—H13 | 118.9 |
N2—Zr1—C6 | 128.29 (6) | C13—C14—C10 | 108.0 |
C11—Zr1—C6 | 117.67 (9) | C13—C14—Zr1 | 74.49 (8) |
C9—Zr1—C6 | 52.00 (6) | C10—C14—Zr1 | 71.97 (8) |
C12—Zr1—C6 | 86.33 (9) | C13—C14—H14 | 126.0 |
N1—Zr1—C10 | 105.18 (8) | C10—C14—H14 | 126.0 |
N2—Zr1—C10 | 77.57 (8) | Zr1—C14—H14 | 119.4 |
Experimental details
Crystal data | |
Chemical formula | [Zr(C5H5)2(C4H9N)(C5H5N)] |
Mr | 371.62 |
Crystal system, space group | Orthorhombic, P212121 |
Temperature (K) | 200 |
a, b, c (Å) | 9.3946 (2), 13.6156 (4), 14.4126 (3) |
V (Å3) | 1843.56 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.60 |
Crystal size (mm) | 0.50 × 0.50 × 0.35 |
Data collection | |
Diffractometer | Stoe IPDS II |
Absorption correction | Numerical (X-SHAPE and X-RED32; Stoe & Cie, 2005) |
Tmin, Tmax | 0.730, 0.896 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 35444, 4990, 4752 |
Rint | 0.025 |
(sin θ/λ)max (Å−1) | 0.686 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.023, 0.059, 1.03 |
No. of reflections | 4990 |
No. of parameters | 181 |
No. of restraints | 16 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.45, −0.38 |
Absolute structure | Flack (1983), 2169 Friedel pairs |
Absolute structure parameter | −0.03 (4) |
Computer programs: X-AREA (Stoe & Cie, 2005), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
Acknowledgements
We thank our technical staff, in particular Regina Jesse, for assistance. This work was supported by the Deutsche Forschungsgemeinschaft (project No. RO1269/7–2).
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
We studied the reaction of several carbodiimides with metallocene precursors as (C5H5)2M(η2-Me3SiC2SiMe3) (M = Ti, Zr) to synthesize and characterize new metallacycles with heteroatoms. In this case the reaction revealed a C—N bond cleavage which resulted in two products. Additionally to (C5H5)2Zr(py)(NtBu) the complex (C5H5)2Zr(CNtBu)(η2-Me3SiC2SiMe3) was found which was described by Bach et al. (2007).
The title compound consists of a zirconium center coordinated by two cyclopentadienyl ligands, a stabilizing pyridine and a tert-butyl imido ligand. The geometry at the zirconium atom is distorted tetrahedral (main deviations from the expected value of 109.47° are obtained in N1—Zr1—N2 95.64 (6)° and Cp—Zr1—Cp 123.9°). Bond lengths and angles can be compared to the thf stabilized complex (C5H5)2Zr(thf)(NtBu) described by Walsh et al. (1993). The bond lengths Zr1—N1 with 1.843 (2) Å and N1—C1 with 1.434 (3) Å are not significantly different compared to those of (C5H5)2Zr(thf)(NtBu) (Zr—N 1.826 (4) and N—C 1.449 (6) Å). In the title compound the Zr1—N1—C1 angle of 168.93 (13)° is about 5° smaller than the corresponding angle found for the almost linear tert-butyl imido ligand in (C5H5)2Zr(thf)(NtBu).