metal-organic compounds
trans-Dichloridobis[dicyclohexyl(phenyl)phosphane-κP]palladium(II)
aResearch Centre for Synthesis and Catalysis, Department of Chemistry, University of Johannesburg, PO Box 524 Auckland Park, Johannesburg 2006, South Africa
*Correspondence e-mail: rmeijboom@uj.ac.za
The title compound, [PdCl2{P(C6H11)2(C6H5)}2], forms a monomeric complex with a trans-square-planar geometry. The Pd—P bond lengths are 2.3343 (5) Å, as the Pd atom lies on an inversion centre, while the Pd—Cl bond lengths are 2.3017 (4) Å. The observed structure was found to be closely related to [PdCl2{P(C6H11)3}2] [Grushin et al. (1994). Inorg. Chem. 33, 4804–4806], [PdBr2{P(C6H11)3}2] [Clarke et al. (2003). Dalton Trans. pp. 4393–4394] and [PdCl2P(C6H11)2(C7H7)}2] [Vuoti et al. (2008). Eur. J. Inorg. Chem. pp. 397–407] (C6H11 is cyclohexyl and C7H7 is o-tolyl). One of the cyclohexyl rings is disordered with the phenyl ring in a 0.587 (9):413 (9) ratio. Five long-range C—H⋯Cl interactions were observed within the structure.
Related literature
For a review on related compounds, see: Spessard & Miessler (1996). For the synthesis of the starting materials, see: Drew & Doyle (1990). For similar R-P2PdCl2 compounds, see: Ogutu & Meijboom (2011); Muller & Meijboom (2010a,b). For their applications, see: Bedford et al. (2004).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2007); cell SAINT-Plus (Bruker, 2007); data reduction: SAINT-Plus and XPREP (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
10.1107/S1600536812010100/zl2455sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812010100/zl2455Isup2.hkl
Dicyclohexylphenylphosphine (0.05 g, 0.35 mmol) was dissolved in acetone (5 cm3). A solution of [Pd(COD)Cl2] (0.05 g, 0.17 mmol) in acetone (5 cm3) was added to the phosphine solution. The mixture was stirred for 5 minutes, after which the solution was left to crystallize. Yellow crystals of the title compound were obtained. 1H NMR (CDCl3, 400 MHz, p.p.m.): 7.6–7.5 (m, 4H), 7.4 (m, 6H), 2.6 (t, 4H), 2.1 (d, 4H), 1.8–1.7 (m, 10H), 1.4–1.2 (m, 20H), 1.1–1.0 (m, 6H). 31P{H} NMR (CDCl3, 162.0 MHz, p.p.m.): 28.05. IR (cm-1): 2925, 2849, 2161, 2023, 1977, 1446, 1433, 1261, 1109, 1011, 848, 773, 700 and 690.
The undisordered quintessential cyclohexyl ring, C7–C12, was used to model the disordered cyclohexyl ring, C1B–C6B, by restraining the two rings to have similar bond lengths and 1,3 atom distances within a standard deviation of 0.02 Å. (SAME command in Shelxtl, Sheldrick, 2008). Atoms C1 and C1B, the two ipso–carbons for the disordered phenyl and dicyclohexyl rings, were constrained to have identical ADPs. The phenyl ring has been constrained to resemble an ideal hexagon with C—C distances of 1.39 Å All hydrogen atoms were positioned geometrically with C—H = 0.98 Å for H atoms bonded to tertiary C atoms, 0.97 Å for methylene H atoms, and 0.93 Å for aromatic H atoms. . All hydrogen atoms were allowed to ride on their parent atoms with Uiso(H) = 1.2Ueq(C). The remaining highest electron peak was 0.37 at 0.95 Å from P1 and the deepest hole was -0.38 at 0.92 Å from Pd1.
Complexes involving palladium metal centres are amongst some of the most popular catalytic precursors in organic synthesis due to their catalytic abilities. They are used in carbon-carbon bond formation reactions like the Heck, Stille and Suzuki reactions (Bedford et al., 2004).
[PdCl2(L)2] (L = tertiary phosphine, arsine or stibine) complexes can conveniently be prepared by the substitution of 1,5-cyclooctadiene (COD) from [PdCl2(COD)]. The title compound, trans-[PdCl2(C18H27P)2], crystallizes with the Pd atom on a center of symmetry and each pair of equivalent ligands in a mutually trans orientation. The geometry is, therefore, slightly distorted square planar and the Pd atom is not elevated out of the coordinating atom plane. All angles in the
are close to the ideal value of 90°, with P—Pd—Cl = 89.296 (16)° and P—Pd—Cli = 90.704 (16)°. As required by the the P—Pd—Pi and Cl—Pd—Cli angles are 180°. The symmetry code used to define atoms through the is: (iv) 2 - x, -y, 2 - z.One of the cyclohexyl rings, C13–C18, in the title compound is disordered with the phenyl ring, C1–C6, over the same positions in a 59:41 (9) occupancy ratio.
The title compound compares well with other closely related PdII complexes from the literature containing two chloro and two tertiary phosphine ligands in a trans geometry (Muller & Meijboom, 2010a, b). The title compound, having a Pd—Cl bond length of 2.3017 (4) Å and a Pd—P bond length of 2.3343 (5) Å, fits well into the typical range for complexes of this kind. Notably the title compound did not crystallize as a solvated complex; these type of PdII complexes have a tendency to crystallize as solvates (Ogutu & Meijboom, 2011).
Due to the disorder of the cyclohexyl ring and phenyl ring, the crystilline structure for the title compound forms an isostructure with a variety of [PdCl2(PR3)2] compounds (R = any combination of aryl and cylcohexyl rings). Notably, the title compound is quintessentially isostructural with: [PdCl2{P(C6H11)3}2] (Grushin et al., 1994); [PdBr2{P(C6H11)3}2] (Clarke et al., 2003); and [PdCl2{P(C6H11)2(C7H7)}2] (Vuoti et al., 2008) ((C6H11) = cyclohexyl, (C7H7) = o-tolyl). The Pd–P and Pd–X (X = Br and Cl) bond lengths were compared and it was observed that they were all within the same range of 2.3–2.4 Å. The angles between the bonds around the Pd atom were all observed to be approximately right angles.
A weak hydrogen bond exists between C13—H13···Cl1i (Symmetry code: -x + 2, -y, -z + 2) with the distance listed in Table 1. Four other longer range hydrogen interactions exist as shown in Table 1.
For a review on related compounds, see: Spessard & Miessler (1996). For the synthesis of the starting materials, see: Drew & Doyle (1990). For similar R-P2PdCl2 compounds, see: Ogutu & Meijboom (2011); Muller & Meijboom (2010a,b). For their applications, see: Bedford et al. (2004).
Data collection: APEX2 (Bruker, 2007); cell
SAINT-Plus (Bruker, 2007); data reduction: SAINT-Plus and XPREP (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: WinGX (Farrugia, 1999).[PdCl2(C18H27P)2] | Z = 1 |
Mr = 726.03 | F(000) = 380 |
Triclinic, P1 | Dx = 1.375 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71069 Å |
a = 9.439 (4) Å | Cell parameters from 9929 reflections |
b = 10.095 (4) Å | θ = 2.2–24.9° |
c = 10.623 (5) Å | µ = 0.80 mm−1 |
α = 113.115 (2)° | T = 100 K |
β = 107.321 (2)° | Conical, yellow |
γ = 91.625 (2)° | 0.27 × 0.13 × 0.11 mm |
V = 876.5 (7) Å3 |
Bruker X8 APEXII 4K KappaCCD diffractometer | 2931 independent reflections |
Radiation source: fine-focus sealed tube | 2891 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.024 |
φ and ω scans | θmax = 24.9°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS; Bruker, 2007) | h = −10→11 |
Tmin = 0.885, Tmax = 0.918 | k = −11→11 |
12144 measured reflections | l = −11→12 |
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)] = 0.021 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.051 | H-atom parameters constrained |
S = 1.19 | w = 1/[σ2(Fo2) + (0.0125P)2 + 0.5911P] where P = (Fo2 + 2Fc2)/3 |
2931 reflections | (Δ/σ)max = 0.001 |
266 parameters | Δρmax = 0.37 e Å−3 |
12 restraints | Δρmin = −0.38 e Å−3 |
[PdCl2(C18H27P)2] | γ = 91.625 (2)° |
Mr = 726.03 | V = 876.5 (7) Å3 |
Triclinic, P1 | Z = 1 |
a = 9.439 (4) Å | Mo Kα radiation |
b = 10.095 (4) Å | µ = 0.80 mm−1 |
c = 10.623 (5) Å | T = 100 K |
α = 113.115 (2)° | 0.27 × 0.13 × 0.11 mm |
β = 107.321 (2)° |
Bruker X8 APEXII 4K KappaCCD diffractometer | 2931 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2007) | 2891 reflections with I > 2σ(I) |
Tmin = 0.885, Tmax = 0.918 | Rint = 0.024 |
12144 measured reflections |
R[F2 > 2σ(F2)] = 0.021 | 12 restraints |
wR(F2) = 0.051 | H-atom parameters constrained |
S = 1.19 | Δρmax = 0.37 e Å−3 |
2931 reflections | Δρmin = −0.38 e Å−3 |
266 parameters |
Experimental. The intensity data was collected on a Bruker X8 Apex II 4 K Kappa CCD diffractometer using an exposure time of 10 s/frame. A collection frame width of 0.5° covering up to θ = 24.9° resulted in 97% completeness accomplished. |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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) | |
C1 | 0.8288 (11) | −0.1156 (10) | 0.6237 (7) | 0.0215 (7) | 0.587 (9) |
C2 | 0.9177 (12) | −0.2245 (12) | 0.6081 (9) | 0.025 (3) | 0.587 (9) |
H2 | 0.9665 | −0.2441 | 0.6874 | 0.030* | 0.587 (9) |
C3 | 0.9336 (9) | −0.3042 (9) | 0.4741 (10) | 0.030 (3) | 0.587 (9) |
H3 | 0.9931 | −0.3770 | 0.4637 | 0.036* | 0.587 (9) |
C4 | 0.8606 (8) | −0.2749 (8) | 0.3556 (8) | 0.038 (2) | 0.587 (9) |
H4 | 0.8713 | −0.3282 | 0.2660 | 0.045* | 0.587 (9) |
C5 | 0.7718 (9) | −0.1660 (9) | 0.3712 (7) | 0.040 (4) | 0.587 (9) |
H5 | 0.7229 | −0.1465 | 0.2920 | 0.048* | 0.587 (9) |
C6 | 0.7558 (7) | −0.0864 (7) | 0.5053 (8) | 0.0294 (15) | 0.587 (9) |
H6 | 0.6964 | −0.0135 | 0.5157 | 0.035* | 0.587 (9) |
C1B | 0.8337 (16) | −0.1023 (17) | 0.6235 (11) | 0.0215 (7) | 0.413 (9) |
H1B | 0.9155 | −0.0324 | 0.6342 | 0.026* | 0.413 (9) |
C2B | 0.892 (2) | −0.2484 (19) | 0.5907 (14) | 0.021 (3) | 0.413 (9) |
H2BA | 0.8132 | −0.3233 | 0.5748 | 0.025* | 0.413 (9) |
H2BB | 0.9771 | −0.2397 | 0.6732 | 0.025* | 0.413 (9) |
C3B | 0.9388 (17) | −0.2926 (17) | 0.4549 (15) | 0.027 (3) | 0.413 (9) |
H3BA | 1.0238 | −0.2223 | 0.4747 | 0.033* | 0.413 (9) |
H3BB | 0.9705 | −0.3873 | 0.4327 | 0.033* | 0.413 (9) |
C4B | 0.8129 (12) | −0.2994 (11) | 0.3271 (10) | 0.023 (2) | 0.413 (9) |
H4BA | 0.7318 | −0.3765 | 0.3012 | 0.027* | 0.413 (9) |
H4BB | 0.8477 | −0.3228 | 0.2448 | 0.027* | 0.413 (9) |
C5B | 0.7549 (14) | −0.1569 (12) | 0.3589 (11) | 0.023 (3) | 0.413 (9) |
H5BA | 0.6712 | −0.1655 | 0.2751 | 0.028* | 0.413 (9) |
H5BB | 0.8337 | −0.0811 | 0.3773 | 0.028* | 0.413 (9) |
C6B | 0.7032 (10) | −0.1141 (10) | 0.4917 (11) | 0.0224 (18) | 0.413 (9) |
H6BA | 0.6677 | −0.0212 | 0.5118 | 0.027* | 0.413 (9) |
H6BB | 0.6207 | −0.1871 | 0.4718 | 0.027* | 0.413 (9) |
C7 | 0.7420 (2) | 0.1499 (2) | 0.8114 (2) | 0.0247 (4) | |
H7 | 0.6498 | 0.1300 | 0.7292 | 0.030* | |
C8 | 0.8584 (3) | 0.2478 (2) | 0.8001 (2) | 0.0335 (5) | |
H8A | 0.8772 | 0.1976 | 0.7093 | 0.040* | |
H8B | 0.9522 | 0.2690 | 0.8792 | 0.040* | |
C9 | 0.8040 (3) | 0.3903 (2) | 0.8064 (2) | 0.0355 (5) | |
H9A | 0.8816 | 0.4529 | 0.8034 | 0.043* | |
H9B | 0.7152 | 0.3697 | 0.7224 | 0.043* | |
C10 | 0.7666 (3) | 0.4687 (2) | 0.9438 (2) | 0.0353 (5) | |
H10A | 0.8579 | 0.4988 | 1.0275 | 0.042* | |
H10B | 0.7267 | 0.5558 | 0.9424 | 0.042* | |
C11 | 0.6531 (3) | 0.3725 (2) | 0.9585 (3) | 0.0365 (5) | |
H11A | 0.5577 | 0.3531 | 0.8818 | 0.044* | |
H11B | 0.6378 | 0.4236 | 1.0508 | 0.044* | |
C12 | 0.7038 (2) | 0.2278 (2) | 0.9498 (2) | 0.0288 (4) | |
H12A | 0.6242 | 0.1658 | 0.9509 | 0.035* | |
H12B | 0.7916 | 0.2459 | 1.0339 | 0.035* | |
C13 | 0.6240 (7) | −0.1337 (11) | 0.7724 (14) | 0.017 (2) | 0.587 (9) |
H13 | 0.6085 | −0.0958 | 0.8667 | 0.020* | 0.587 (9) |
C14 | 0.4830 (6) | −0.1221 (6) | 0.6629 (6) | 0.0260 (12) | 0.587 (9) |
H14A | 0.4726 | −0.0202 | 0.6898 | 0.031* | 0.587 (9) |
H14B | 0.4928 | −0.1611 | 0.5672 | 0.031* | 0.587 (9) |
C15 | 0.3432 (8) | −0.2058 (7) | 0.6579 (13) | 0.038 (2) | 0.587 (9) |
H15A | 0.3289 | −0.1617 | 0.7515 | 0.046* | 0.587 (9) |
H15B | 0.2557 | −0.1994 | 0.5855 | 0.046* | 0.587 (9) |
C16 | 0.3565 (8) | −0.3654 (7) | 0.6210 (8) | 0.0311 (14) | 0.587 (9) |
H16A | 0.2694 | −0.4143 | 0.6255 | 0.037* | 0.587 (9) |
H16B | 0.3591 | −0.4128 | 0.5228 | 0.037* | 0.587 (9) |
C17 | 0.4985 (10) | −0.3777 (10) | 0.7268 (16) | 0.029 (2) | 0.587 (9) |
H17A | 0.5083 | −0.4798 | 0.6985 | 0.035* | 0.587 (9) |
H17B | 0.4903 | −0.3397 | 0.8232 | 0.035* | 0.587 (9) |
C18 | 0.6381 (8) | −0.2948 (9) | 0.7318 (17) | 0.023 (3) | 0.587 (9) |
H18A | 0.6513 | −0.3373 | 0.6377 | 0.028* | 0.587 (9) |
H18B | 0.7258 | −0.3027 | 0.8029 | 0.028* | 0.587 (9) |
C13B | 0.6193 (7) | −0.1534 (11) | 0.7533 (16) | 0.027 (5) | 0.413 (9) |
C14B | 0.4787 (8) | −0.1111 (7) | 0.7229 (11) | 0.0331 (19) | 0.413 (9) |
H14C | 0.4707 | −0.0176 | 0.7283 | 0.040* | 0.413 (9) |
C15B | 0.3501 (7) | −0.2087 (9) | 0.6846 (13) | 0.045 (5) | 0.413 (9) |
H15C | 0.2560 | −0.1804 | 0.6642 | 0.054* | 0.413 (9) |
C16B | 0.3620 (11) | −0.3485 (8) | 0.6766 (10) | 0.033 (2) | 0.413 (9) |
H16C | 0.2760 | −0.4137 | 0.6509 | 0.040* | 0.413 (9) |
C17B | 0.5026 (14) | −0.3907 (9) | 0.7070 (17) | 0.035 (5) | 0.413 (9) |
H17C | 0.5106 | −0.4843 | 0.7016 | 0.042* | 0.413 (9) |
C18B | 0.6312 (10) | −0.2932 (14) | 0.745 (2) | 0.032 (6) | 0.413 (9) |
H18C | 0.7253 | −0.3215 | 0.7657 | 0.038* | 0.413 (9) |
P1 | 0.79648 (5) | −0.02795 (5) | 0.79688 (5) | 0.01688 (11) | |
Cl1 | 1.15978 (5) | 0.06458 (5) | 0.89925 (5) | 0.02496 (11) | |
Pd1 | 1.0000 | 0.0000 | 1.0000 | 0.01502 (8) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0227 (11) | 0.0238 (17) | 0.0172 (9) | 0.0024 (11) | 0.0065 (8) | 0.0079 (9) |
C2 | 0.022 (4) | 0.026 (4) | 0.022 (3) | −0.002 (3) | 0.004 (3) | 0.006 (3) |
C3 | 0.024 (3) | 0.030 (3) | 0.027 (4) | 0.001 (2) | 0.006 (3) | 0.005 (3) |
C4 | 0.032 (5) | 0.046 (4) | 0.025 (4) | −0.004 (3) | 0.017 (3) | 0.001 (3) |
C5 | 0.040 (5) | 0.059 (7) | 0.024 (4) | 0.000 (4) | 0.009 (3) | 0.022 (4) |
C6 | 0.030 (4) | 0.033 (3) | 0.029 (3) | 0.005 (3) | 0.012 (3) | 0.015 (2) |
C1B | 0.0227 (11) | 0.0238 (17) | 0.0172 (9) | 0.0024 (11) | 0.0065 (8) | 0.0079 (9) |
C2B | 0.022 (5) | 0.020 (5) | 0.016 (4) | 0.005 (5) | 0.004 (3) | 0.006 (3) |
C3B | 0.036 (6) | 0.034 (5) | 0.018 (5) | 0.015 (4) | 0.016 (4) | 0.012 (4) |
C4B | 0.027 (5) | 0.026 (4) | 0.015 (3) | 0.001 (4) | 0.007 (4) | 0.009 (3) |
C5B | 0.033 (5) | 0.023 (5) | 0.012 (4) | 0.008 (4) | 0.007 (3) | 0.006 (4) |
C6B | 0.023 (5) | 0.026 (4) | 0.016 (3) | 0.003 (3) | 0.002 (4) | 0.010 (3) |
C7 | 0.0291 (10) | 0.0221 (9) | 0.0232 (9) | 0.0069 (8) | 0.0079 (8) | 0.0102 (8) |
C8 | 0.0487 (13) | 0.0264 (10) | 0.0347 (11) | 0.0097 (9) | 0.0222 (10) | 0.0158 (9) |
C9 | 0.0496 (14) | 0.0271 (10) | 0.0358 (12) | 0.0089 (9) | 0.0148 (10) | 0.0187 (9) |
C10 | 0.0481 (14) | 0.0232 (10) | 0.0356 (11) | 0.0112 (9) | 0.0138 (10) | 0.0130 (9) |
C11 | 0.0446 (13) | 0.0268 (10) | 0.0399 (12) | 0.0117 (9) | 0.0209 (11) | 0.0106 (9) |
C12 | 0.0359 (11) | 0.0230 (9) | 0.0298 (10) | 0.0055 (8) | 0.0158 (9) | 0.0098 (8) |
C13 | 0.023 (4) | 0.013 (2) | 0.013 (3) | 0.0053 (19) | 0.002 (2) | 0.007 (2) |
C14 | 0.024 (2) | 0.029 (2) | 0.028 (3) | 0.0036 (15) | 0.007 (2) | 0.017 (2) |
C15 | 0.033 (4) | 0.026 (4) | 0.054 (3) | 0.008 (3) | 0.009 (3) | 0.019 (3) |
C16 | 0.027 (2) | 0.031 (2) | 0.034 (4) | −0.0029 (17) | 0.008 (3) | 0.016 (2) |
C17 | 0.025 (5) | 0.025 (4) | 0.043 (4) | 0.003 (3) | 0.013 (3) | 0.019 (3) |
C18 | 0.019 (4) | 0.020 (5) | 0.031 (4) | −0.004 (3) | 0.008 (3) | 0.011 (3) |
C13B | 0.020 (5) | 0.033 (8) | 0.021 (6) | −0.005 (4) | 0.010 (4) | 0.004 (4) |
C14B | 0.034 (3) | 0.026 (3) | 0.044 (5) | 0.007 (2) | 0.018 (4) | 0.015 (4) |
C15B | 0.011 (5) | 0.063 (9) | 0.065 (8) | 0.003 (4) | 0.011 (4) | 0.034 (5) |
C16B | 0.036 (4) | 0.036 (4) | 0.029 (5) | −0.003 (3) | 0.014 (4) | 0.012 (4) |
C17B | 0.043 (9) | 0.023 (6) | 0.039 (7) | 0.001 (5) | 0.015 (5) | 0.011 (4) |
C18B | 0.041 (9) | 0.031 (8) | 0.034 (7) | 0.020 (6) | 0.017 (6) | 0.020 (6) |
P1 | 0.0191 (2) | 0.0180 (2) | 0.0148 (2) | 0.00359 (17) | 0.00545 (18) | 0.00827 (17) |
Cl1 | 0.0231 (2) | 0.0357 (2) | 0.0193 (2) | 0.00003 (18) | 0.00788 (18) | 0.01451 (19) |
Pd1 | 0.01700 (11) | 0.01711 (11) | 0.01244 (10) | 0.00288 (7) | 0.00508 (7) | 0.00760 (7) |
C1—C2 | 1.3900 | C10—H10A | 0.9700 |
C1—C6 | 1.3900 | C10—H10B | 0.9700 |
C1—P1 | 1.825 (7) | C11—C12 | 1.527 (3) |
C2—C3 | 1.3900 | C11—H11A | 0.9700 |
C2—H2 | 0.9300 | C11—H11B | 0.9700 |
C3—C4 | 1.3900 | C12—H12A | 0.9700 |
C3—H3 | 0.9300 | C12—H12B | 0.9700 |
C4—C5 | 1.3900 | C13—C14 | 1.528 (8) |
C4—H4 | 0.9300 | C13—C18 | 1.531 (9) |
C5—C6 | 1.3900 | C13—P1 | 1.813 (7) |
C5—H5 | 0.9300 | C13—H13 | 0.9800 |
C6—H6 | 0.9300 | C14—C15 | 1.523 (8) |
C1B—C6B | 1.524 (10) | C14—H14A | 0.9700 |
C1B—C2B | 1.534 (9) | C14—H14B | 0.9700 |
C1B—P1 | 1.843 (10) | C15—C16 | 1.519 (7) |
C1B—H1B | 0.9800 | C15—H15A | 0.9700 |
C2B—C3B | 1.538 (11) | C15—H15B | 0.9700 |
C2B—H2BA | 0.9700 | C16—C17 | 1.516 (10) |
C2B—H2BB | 0.9700 | C16—H16A | 0.9700 |
C3B—C4B | 1.491 (12) | C16—H16B | 0.9700 |
C3B—H3BA | 0.9700 | C17—C18 | 1.517 (8) |
C3B—H3BB | 0.9700 | C17—H17A | 0.9700 |
C4B—C5B | 1.503 (10) | C17—H17B | 0.9700 |
C4B—H4BA | 0.9700 | C18—H18A | 0.9700 |
C4B—H4BB | 0.9700 | C18—H18B | 0.9700 |
C5B—C6B | 1.536 (9) | C13B—C14B | 1.3900 |
C5B—H5BA | 0.9700 | C13B—C18B | 1.3900 |
C5B—H5BB | 0.9700 | C13B—P1 | 1.891 (7) |
C6B—H6BA | 0.9700 | C14B—C15B | 1.3900 |
C6B—H6BB | 0.9700 | C14B—H14C | 0.9300 |
C7—C8 | 1.520 (3) | C15B—C16B | 1.3900 |
C7—C12 | 1.528 (3) | C15B—H15C | 0.9300 |
C7—P1 | 1.8421 (19) | C16B—C17B | 1.3900 |
C7—H7 | 0.9800 | C16B—H16C | 0.9300 |
C8—C9 | 1.524 (3) | C17B—C18B | 1.3900 |
C8—H8A | 0.9700 | C17B—H17C | 0.9300 |
C8—H8B | 0.9700 | C18B—H18C | 0.9300 |
C9—C10 | 1.516 (3) | P1—Pd1 | 2.3343 (5) |
C9—H9A | 0.9700 | Cl1—Pd1 | 2.3017 (4) |
C9—H9B | 0.9700 | Pd1—Cl1i | 2.3017 (4) |
C10—C11 | 1.507 (3) | Pd1—P1i | 2.3343 (5) |
C2—C1—C6 | 120.0 | C12—C11—H11B | 109.2 |
C2—C1—P1 | 117.9 (5) | H11A—C11—H11B | 107.9 |
C6—C1—P1 | 121.8 (5) | C11—C12—C7 | 110.85 (17) |
C1—C2—C3 | 120.0 | C11—C12—H12A | 109.5 |
C1—C2—H2 | 120.0 | C7—C12—H12A | 109.5 |
C3—C2—H2 | 120.0 | C11—C12—H12B | 109.5 |
C4—C3—C2 | 120.0 | C7—C12—H12B | 109.5 |
C4—C3—H3 | 120.0 | H12A—C12—H12B | 108.1 |
C2—C3—H3 | 120.0 | C14—C13—C18 | 109.4 (6) |
C3—C4—C5 | 120.0 | C14—C13—P1 | 114.9 (5) |
C3—C4—H4 | 120.0 | C18—C13—P1 | 111.5 (5) |
C5—C4—H4 | 120.0 | C14—C13—H13 | 106.9 |
C6—C5—C4 | 120.0 | C18—C13—H13 | 106.9 |
C6—C5—H5 | 120.0 | P1—C13—H13 | 106.9 |
C4—C5—H5 | 120.0 | C15—C14—C13 | 110.9 (6) |
C5—C6—C1 | 120.0 | C15—C14—H14A | 109.5 |
C5—C6—H6 | 120.0 | C13—C14—H14A | 109.5 |
C1—C6—H6 | 120.0 | C15—C14—H14B | 109.5 |
C6B—C1B—C2B | 109.7 (7) | C13—C14—H14B | 109.5 |
C6B—C1B—P1 | 114.9 (8) | H14A—C14—H14B | 108.0 |
C2B—C1B—P1 | 113.6 (8) | C16—C15—C14 | 111.4 (5) |
C6B—C1B—H1B | 106.0 | C16—C15—H15A | 109.4 |
C2B—C1B—H1B | 106.0 | C14—C15—H15A | 109.4 |
P1—C1B—H1B | 106.0 | C16—C15—H15B | 109.4 |
C1B—C2B—C3B | 110.2 (6) | C14—C15—H15B | 109.4 |
C1B—C2B—H2BA | 109.6 | H15A—C15—H15B | 108.0 |
C3B—C2B—H2BA | 109.6 | C17—C16—C15 | 110.2 (6) |
C1B—C2B—H2BB | 109.6 | C17—C16—H16A | 109.6 |
C3B—C2B—H2BB | 109.6 | C15—C16—H16A | 109.6 |
H2BA—C2B—H2BB | 108.1 | C17—C16—H16B | 109.6 |
C4B—C3B—C2B | 111.5 (7) | C15—C16—H16B | 109.6 |
C4B—C3B—H3BA | 109.3 | H16A—C16—H16B | 108.1 |
C2B—C3B—H3BA | 109.3 | C16—C17—C18 | 112.1 (6) |
C4B—C3B—H3BB | 109.3 | C16—C17—H17A | 109.2 |
C2B—C3B—H3BB | 109.3 | C18—C17—H17A | 109.2 |
H3BA—C3B—H3BB | 108.0 | C16—C17—H17B | 109.2 |
C3B—C4B—C5B | 111.3 (8) | C18—C17—H17B | 109.2 |
C3B—C4B—H4BA | 109.4 | H17A—C17—H17B | 107.9 |
C5B—C4B—H4BA | 109.4 | C17—C18—C13 | 110.4 (6) |
C3B—C4B—H4BB | 109.4 | C17—C18—H18A | 109.6 |
C5B—C4B—H4BB | 109.4 | C13—C18—H18A | 109.6 |
H4BA—C4B—H4BB | 108.0 | C17—C18—H18B | 109.6 |
C4B—C5B—C6B | 110.8 (7) | C13—C18—H18B | 109.6 |
C4B—C5B—H5BA | 109.5 | H18A—C18—H18B | 108.1 |
C6B—C5B—H5BA | 109.5 | C14B—C13B—C18B | 120.0 |
C4B—C5B—H5BB | 109.5 | C14B—C13B—P1 | 121.5 (5) |
C6B—C5B—H5BB | 109.5 | C18B—C13B—P1 | 118.4 (5) |
H5BA—C5B—H5BB | 108.1 | C15B—C14B—C13B | 120.0 |
C1B—C6B—C5B | 109.8 (8) | C15B—C14B—H14C | 120.0 |
C1B—C6B—H6BA | 109.7 | C13B—C14B—H14C | 120.0 |
C5B—C6B—H6BA | 109.7 | C16B—C15B—C14B | 120.0 |
C1B—C6B—H6BB | 109.7 | C16B—C15B—H15C | 120.0 |
C5B—C6B—H6BB | 109.7 | C14B—C15B—H15C | 120.0 |
H6BA—C6B—H6BB | 108.2 | C15B—C16B—C17B | 120.0 |
C8—C7—C12 | 111.13 (16) | C15B—C16B—H16C | 120.0 |
C8—C7—P1 | 113.28 (14) | C17B—C16B—H16C | 120.0 |
C12—C7—P1 | 111.08 (13) | C18B—C17B—C16B | 120.0 |
C8—C7—H7 | 107.0 | C18B—C17B—H17C | 120.0 |
C12—C7—H7 | 107.0 | C16B—C17B—H17C | 120.0 |
P1—C7—H7 | 107.0 | C17B—C18B—C13B | 120.0 |
C7—C8—C9 | 110.74 (18) | C17B—C18B—H18C | 120.0 |
C7—C8—H8A | 109.5 | C13B—C18B—H18C | 120.0 |
C9—C8—H8A | 109.5 | C13—P1—C1 | 104.6 (6) |
C7—C8—H8B | 109.5 | C13—P1—C7 | 103.3 (3) |
C9—C8—H8B | 109.5 | C1—P1—C7 | 107.4 (3) |
H8A—C8—H8B | 108.1 | C13—P1—C1B | 108.0 (6) |
C10—C9—C8 | 111.03 (17) | C7—P1—C1B | 103.5 (5) |
C10—C9—H9A | 109.4 | C1—P1—C13B | 98.7 (5) |
C8—C9—H9A | 109.4 | C7—P1—C13B | 106.9 (3) |
C10—C9—H9B | 109.4 | C1B—P1—C13B | 102.1 (7) |
C8—C9—H9B | 109.4 | C13—P1—Pd1 | 115.0 (3) |
H9A—C9—H9B | 108.0 | C1—P1—Pd1 | 114.7 (3) |
C11—C10—C9 | 111.58 (18) | C7—P1—Pd1 | 110.95 (6) |
C11—C10—H10A | 109.3 | C1B—P1—Pd1 | 114.8 (4) |
C9—C10—H10A | 109.3 | C13B—P1—Pd1 | 117.3 (4) |
C11—C10—H10B | 109.3 | Cl1—Pd1—Cl1i | 180.0 |
C9—C10—H10B | 109.3 | Cl1—Pd1—P1 | 89.296 (16) |
H10A—C10—H10B | 108.0 | Cl1i—Pd1—P1 | 90.704 (16) |
C10—C11—C12 | 112.03 (18) | Cl1—Pd1—P1i | 90.704 (16) |
C10—C11—H11A | 109.2 | Cl1i—Pd1—P1i | 89.296 (16) |
C12—C11—H11A | 109.2 | P1—Pd1—P1i | 180.0 |
C10—C11—H11B | 109.2 |
Symmetry code: (i) −x+2, −y, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C8—H8B···Cl1 | 0.97 | 2.91 | 3.559 (2) | 125 |
C5—H5···Cl1ii | 0.93 | 2.94 | 3.619 (7) | 131 |
C13—H13···Cl1i | 0.98 | 2.68 | 3.254 (11) | 118 |
C18—H18B···Cl1i | 0.97 | 2.97 | 3.542 (13) | 119 |
C15—H15A···Cl1iii | 0.97 | 3.02 | 3.800 (8) | 139 |
Symmetry codes: (i) −x+2, −y, −z+2; (ii) −x+2, −y, −z+1; (iii) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | [PdCl2(C18H27P)2] |
Mr | 726.03 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 100 |
a, b, c (Å) | 9.439 (4), 10.095 (4), 10.623 (5) |
α, β, γ (°) | 113.115 (2), 107.321 (2), 91.625 (2) |
V (Å3) | 876.5 (7) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 0.80 |
Crystal size (mm) | 0.27 × 0.13 × 0.11 |
Data collection | |
Diffractometer | Bruker X8 APEXII 4K KappaCCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2007) |
Tmin, Tmax | 0.885, 0.918 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12144, 2931, 2891 |
Rint | 0.024 |
(sin θ/λ)max (Å−1) | 0.591 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.021, 0.051, 1.19 |
No. of reflections | 2931 |
No. of parameters | 266 |
No. of restraints | 12 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.37, −0.38 |
Computer programs: APEX2 (Bruker, 2007), SAINT-Plus (Bruker, 2007), SAINT-Plus and XPREP (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg & Putz, 2005), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
C8—H8B···Cl1 | 0.97 | 2.91 | 3.559 (2) | 125.3 |
C5—H5···Cl1i | 0.93 | 2.94 | 3.619 (7) | 131.1 |
C13—H13···Cl1ii | 0.98 | 2.68 | 3.254 (11) | 117.8 |
C18—H18B···Cl1ii | 0.97 | 2.97 | 3.542 (13) | 119.1 |
C15—H15A···Cl1iii | 0.97 | 3.02 | 3.800 (8) | 138.5 |
Symmetry codes: (i) −x+2, −y, −z+1; (ii) −x+2, −y, −z+2; (iii) x−1, y, z. |
Acknowledgements
ARB thanks the University of Johannesburg and the South African National Research Foundation for financial support.
References
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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.
Complexes involving palladium metal centres are amongst some of the most popular catalytic precursors in organic synthesis due to their catalytic abilities. They are used in carbon-carbon bond formation reactions like the Heck, Stille and Suzuki reactions (Bedford et al., 2004).
[PdCl2(L)2] (L = tertiary phosphine, arsine or stibine) complexes can conveniently be prepared by the substitution of 1,5-cyclooctadiene (COD) from [PdCl2(COD)]. The title compound, trans-[PdCl2(C18H27P)2], crystallizes with the Pd atom on a center of symmetry and each pair of equivalent ligands in a mutually trans orientation. The geometry is, therefore, slightly distorted square planar and the Pd atom is not elevated out of the coordinating atom plane. All angles in the coordination polyhedron are close to the ideal value of 90°, with P—Pd—Cl = 89.296 (16)° and P—Pd—Cli = 90.704 (16)°. As required by the crystallographic symmetry, the P—Pd—Pi and Cl—Pd—Cli angles are 180°. The symmetry code used to define atoms through the inversion point is: (iv) 2 - x, -y, 2 - z.
One of the cyclohexyl rings, C13–C18, in the title compound is disordered with the phenyl ring, C1–C6, over the same positions in a 59:41 (9) occupancy ratio.
The title compound compares well with other closely related PdII complexes from the literature containing two chloro and two tertiary phosphine ligands in a trans geometry (Muller & Meijboom, 2010a, b). The title compound, having a Pd—Cl bond length of 2.3017 (4) Å and a Pd—P bond length of 2.3343 (5) Å, fits well into the typical range for complexes of this kind. Notably the title compound did not crystallize as a solvated complex; these type of PdII complexes have a tendency to crystallize as solvates (Ogutu & Meijboom, 2011).
Due to the disorder of the cyclohexyl ring and phenyl ring, the crystilline structure for the title compound forms an isostructure with a variety of [PdCl2(PR3)2] compounds (R = any combination of aryl and cylcohexyl rings). Notably, the title compound is quintessentially isostructural with: [PdCl2{P(C6H11)3}2] (Grushin et al., 1994); [PdBr2{P(C6H11)3}2] (Clarke et al., 2003); and [PdCl2{P(C6H11)2(C7H7)}2] (Vuoti et al., 2008) ((C6H11) = cyclohexyl, (C7H7) = o-tolyl). The Pd–P and Pd–X (X = Br and Cl) bond lengths were compared and it was observed that they were all within the same range of 2.3–2.4 Å. The angles between the bonds around the Pd atom were all observed to be approximately right angles.
A weak hydrogen bond exists between C13—H13···Cl1i (Symmetry code: -x + 2, -y, -z + 2) with the distance listed in Table 1. Four other longer range hydrogen interactions exist as shown in Table 1.