
Supporting information
![]() | Crystallographic Information File (CIF) https://doi.org/10.1107/S160053680702990X/ng2286sup1.cif |
![]() | Structure factor file (CIF format) https://doi.org/10.1107/S160053680702990X/ng2286Isup2.hkl |
CCDC reference: 654804
The analogous trifluoroacetate-complex was synthesized according to a modification of a published protocol (Sjövall et al., 2001 & Sjövall et al., 2002). The (PCP)Pd-TFA complex (10 mg, 16 µmol) was dissolved in toluene-d8 (0.6 ml) in a J. Young tube and an excess of NaBr added. The tube was allowed to stand over night in room temperature and after 12 h, a 31P-NMR spectrum confirmed that the title complex had been quantitatively obtained. The NMR sample was first decanted and then filtered through a short pad of celite. Recrystallization in pentane at 255 K overnight resulted in colourless blocks. 1H-NMR (toluene-d8): δ 2.15–0.80 (m region, 13H, CH & CH2), 1.35 (m, 36H, coalesced virtual triplets). 31P{1H} NMR (toluene-d8): δ 70.2 (s). 13C{1H} NMR (toluene-d8): δ 66.8 (t, 2JPC = 3.9 Hz, CHPd), 50.9 (vt, JPC = 15.1 Hz, CHCHPd), 35.9 (vt, JPC = 12,6 Hz, C(CH3)3), 35.2 (vt, JPC = 15.1 Hz, C(CH3)3), 34.8 (vt, JPC = 26.0 Hz, CH2P), 32.9 (vt, JPC = 15.8 Hz, CH2CHCHPd), 30.2 (vt, JPC = 5.9 Hz, C(CH3)3), 29.5 (vt, JPC = 5.8 Hz, C(CH3)3), 27.0 (s, CH2CH2CHCHPd).
The H atoms were positioned geometrically and treated as riding on their parent atoms with C–H distances of 0.93–0.97 Å and Uiso(H) = 1.2Ueq - 1.5Ueq.
The title compound belongs to a family of C-sp3-H activated PCP complexes that show interesting catalytic performance in C—C coupling reactions (Ohff et al.,1997; Sjövall et al., 2002; Nilsson & Wendt, 2005). The iodide and trifluoroacetate analogues have previously been prepared and the crystal structure of the iodide described (Sjövall et al., 2002).
The vast majority of reported palladium (PCP)-complexes are constructed with an aromatic back-bone. The aliphatic based complexes, such as the iodide compound mentioned, are studied in recent publications on PCP)-type of compounds coordinated to metals such as rhodium (Kuznetsov et al., 2006) and nickel (Castonguay et al., 2006; Pandarus et al., 2007).
The title compound exhibits a pseudo-square-planar geometry with the phosphorus atoms positioned trans to each other with a P1—Pd—P2 angle of 166.32 (4) °. Coordination of the (PCP)-tridentate ligand leads to the formation of two five-membered rings. The distortion, manifested in the repulsion of the P1 and P2 from the σ-donating bromine atom, results in acute angles for the bis-chelating system.
For the coordination plane formed by Pd, P1, C2 and P2 the largest deviation from this plane is observed for Pd, at 0.0690 (7) Å (r.m.s. of fitted atoms = 0.0445). The Br lies out out of the plane by 0.560 (6) Å. There are intramolecular H···Br contacts: C113—H···Br, 156.62 °, H···Br, 2.852 Å and C211—H···Br, 154.93 °, H···Br, 2.860 Å. The mean plane of the cyclohexane ring is aligned with the palladium coordination plane owing to C—H activation in an equatorial position. Perpendicular to the coordination plane is a pseudo-mirror plane through atoms Br1, Pd1, C2 and C5. Selected bond lengths and angles are given in Table 1.
Comparison of the title compound (I) to the analogous iodo-complex indicates the expected Pd-halogen bond distance decreases by 0.2 Å. Also noted is the lower trans-influence of the bromide on the Pd—C2 bond distance with a ca 0.05 Å decrease as compared with that in the the iodine complex.
See Kuznetsov et al. (2006) for the rhodium complex with the ligand, and Castonguay et al. (2006) and Pandarus & Zargarian (2007) for the nickel complex.
For related literature, see: Davis & Hassel (1963); Nilsson & Wendt (2005); Ohff et al. (1997); Sjövall et al. (2002, 2001).
Data collection: CrysAlis CCD (Oxford Diffraction, 2006); cell refinement: CrysAlis RED (Oxford Diffraction, 2006); data reduction: CrysAlis RED; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: DIAMOND (Brandenburg, 2000); software used to prepare material for publication: WinGX (Farrugia, 1999).
![]() | Fig. 1. The molecular structure of (I) with atom labels and 30% probability displacement ellipsoids. H-atoms were omitted for clarity. |
[PdBr(C24H49P2)] | F(000) = 1216 |
Mr = 585.88 | Dx = 1.391 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 5773 reflections |
a = 11.4392 (2) Å | θ = 2–30° |
b = 15.7757 (2) Å | µ = 2.21 mm−1 |
c = 15.6508 (2) Å | T = 293 K |
β = 97.846 (2)° | Plate, colourless |
V = 2797.92 (7) Å3 | 0.25 × 0.13 × 0.05 mm |
Z = 4 |
Oxford Diffraction Xcalibur diffractometer | 6739 independent reflections |
Radiation source: fine-focus sealed tube | 3849 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.046 |
φ and ω scans | θmax = 28°, θmin = 2.2° |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2006) | h = −15→14 |
Tmin = 0.608, Tmax = 0.897 | k = −20→19 |
22034 measured reflections | l = −11→20 |
Refinement on F2 | 0 restraints |
Least-squares matrix: full | H-atom parameters constrained |
R[F2 > 2σ(F2)] = 0.041 | w = 1/[σ2(Fo2) + (0.0605P)2] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.122 | (Δ/σ)max = 0.001 |
S = 0.94 | Δρmax = 1.22 e Å−3 |
6739 reflections | Δρmin = −0.62 e Å−3 |
265 parameters |
[PdBr(C24H49P2)] | V = 2797.92 (7) Å3 |
Mr = 585.88 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 11.4392 (2) Å | µ = 2.21 mm−1 |
b = 15.7757 (2) Å | T = 293 K |
c = 15.6508 (2) Å | 0.25 × 0.13 × 0.05 mm |
β = 97.846 (2)° |
Oxford Diffraction Xcalibur diffractometer | 6739 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2006) | 3849 reflections with I > 2σ(I) |
Tmin = 0.608, Tmax = 0.897 | Rint = 0.046 |
22034 measured reflections |
R[F2 > 2σ(F2)] = 0.041 | 0 restraints |
wR(F2) = 0.122 | H-atom parameters constrained |
S = 0.94 | Δρmax = 1.22 e Å−3 |
6739 reflections | Δρmin = −0.62 e Å−3 |
265 parameters |
Experimental. The intensity data were collected on a Oxford Xcalibur 3 CCD diffractometer using an exposure time of 20 s/frame. A total of 552 frames were collected with a frame width of 0.5° covering up to θ = 28.00° with 99.7% completeness accomplished. The highest difference peak in the Fourier map is located 0.58 Å from H11G. |
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. |
x | y | z | Uiso*/Ueq | ||
Pd | 0.12038 (3) | 0.307166 (19) | 0.294263 (19) | 0.03791 (11) | |
Br | 0.04772 (5) | 0.18770 (3) | 0.38524 (3) | 0.06669 (18) | |
P1 | −0.05901 (10) | 0.33357 (7) | 0.20991 (7) | 0.0401 (3) | |
P2 | 0.31172 (10) | 0.31083 (7) | 0.36407 (7) | 0.0434 (3) | |
C11 | −0.1341 (4) | 0.2413 (3) | 0.1477 (3) | 0.0489 (11) | |
C12 | −0.1645 (4) | 0.3959 (3) | 0.2668 (3) | 0.0563 (12) | |
C21 | 0.3996 (4) | 0.2097 (3) | 0.3661 (4) | 0.0637 (14) | |
C22 | 0.3278 (5) | 0.3646 (4) | 0.4721 (3) | 0.0676 (15) | |
C111 | −0.0333 (5) | 0.1887 (3) | 0.1208 (3) | 0.0711 (16) | |
H11D | 0.0197 | 0.1726 | 0.1711 | 0.107* | |
H11E | 0.0085 | 0.2216 | 0.0832 | 0.107* | |
H11F | −0.0648 | 0.1387 | 0.0911 | 0.107* | |
C112 | −0.2143 (5) | 0.2680 (4) | 0.0653 (3) | 0.0718 (15) | |
H11G | −0.2529 | 0.2189 | 0.0384 | 0.108* | |
H11H | −0.1675 | 0.2944 | 0.0262 | 0.108* | |
H11I | −0.2724 | 0.3075 | 0.0797 | 0.108* | |
C113 | −0.2029 (5) | 0.1875 (3) | 0.2036 (3) | 0.0744 (16) | |
H11A | −0.2735 | 0.2169 | 0.2131 | 0.112* | |
H11B | −0.1553 | 0.1768 | 0.2579 | 0.112* | |
H11C | −0.2236 | 0.1346 | 0.1751 | 0.112* | |
C121 | −0.1024 (5) | 0.4795 (3) | 0.2942 (4) | 0.0756 (16) | |
H12A | −0.1518 | 0.5128 | 0.3261 | 0.113* | |
H12B | −0.0876 | 0.5103 | 0.2438 | 0.113* | |
H12C | −0.0289 | 0.4679 | 0.3297 | 0.113* | |
C122 | −0.2821 (5) | 0.4138 (4) | 0.2116 (4) | 0.0853 (18) | |
H12D | −0.3251 | 0.3618 | 0.2007 | 0.128* | |
H12E | −0.2681 | 0.4384 | 0.1578 | 0.128* | |
H12F | −0.3271 | 0.4525 | 0.2414 | 0.128* | |
C123 | −0.1849 (5) | 0.3509 (4) | 0.3498 (3) | 0.0785 (17) | |
H12G | −0.24 | 0.3829 | 0.378 | 0.118* | |
H12H | −0.1115 | 0.3463 | 0.3873 | 0.118* | |
H12I | −0.2162 | 0.2953 | 0.3363 | 0.118* | |
C211 | 0.3732 (6) | 0.1497 (4) | 0.4388 (5) | 0.099 (2) | |
H21D | 0.4091 | 0.0956 | 0.4319 | 0.148* | |
H21E | 0.2894 | 0.1428 | 0.4361 | 0.148* | |
H21F | 0.4047 | 0.1735 | 0.4936 | 0.148* | |
C212 | 0.5329 (5) | 0.2234 (4) | 0.3741 (4) | 0.0875 (19) | |
H21G | 0.5588 | 0.2551 | 0.4256 | 0.131* | |
H21H | 0.5515 | 0.2543 | 0.3249 | 0.131* | |
H21I | 0.5721 | 0.1695 | 0.3769 | 0.131* | |
C213 | 0.3566 (6) | 0.1660 (4) | 0.2800 (4) | 0.098 (2) | |
H21A | 0.3774 | 0.1999 | 0.2334 | 0.147* | |
H21B | 0.2725 | 0.1593 | 0.2739 | 0.147* | |
H21C | 0.3932 | 0.1113 | 0.2789 | 0.147* | |
C221 | 0.2542 (6) | 0.3207 (5) | 0.5306 (4) | 0.109 (3) | |
H22G | 0.2864 | 0.2655 | 0.545 | 0.163* | |
H22H | 0.1748 | 0.3151 | 0.5021 | 0.163* | |
H22I | 0.2542 | 0.3534 | 0.5824 | 0.163* | |
C222 | 0.2813 (6) | 0.4561 (4) | 0.4546 (4) | 0.104 (2) | |
H22D | 0.1982 | 0.4545 | 0.4346 | 0.156* | |
H22E | 0.3218 | 0.482 | 0.4115 | 0.156* | |
H22F | 0.2952 | 0.4886 | 0.507 | 0.156* | |
C223 | 0.4555 (5) | 0.3728 (5) | 0.5168 (4) | 0.099 (2) | |
H22A | 0.458 | 0.4113 | 0.5645 | 0.149* | |
H22B | 0.5045 | 0.394 | 0.4764 | 0.149* | |
H22C | 0.4837 | 0.3182 | 0.5374 | 0.149* | |
C1 | 0.0980 (4) | 0.4455 (3) | 0.1552 (3) | 0.0526 (11) | |
H1 | 0.0814 | 0.4912 | 0.1943 | 0.063* | |
C2 | 0.1859 (4) | 0.3882 (3) | 0.2071 (3) | 0.0456 (10) | |
H2 | 0.2076 | 0.3489 | 0.1633 | 0.055* | |
C3 | 0.3007 (4) | 0.4325 (3) | 0.2371 (3) | 0.0494 (11) | |
H3 | 0.2803 | 0.4787 | 0.2742 | 0.059* | |
C4 | 0.3521 (4) | 0.4754 (3) | 0.1645 (3) | 0.0568 (12) | |
H4A | 0.4188 | 0.5097 | 0.1888 | 0.068* | |
H4B | 0.3814 | 0.4322 | 0.1287 | 0.068* | |
C5 | 0.2664 (5) | 0.5305 (3) | 0.1088 (3) | 0.0678 (14) | |
H5A | 0.3006 | 0.5465 | 0.0577 | 0.081* | |
H5B | 0.2535 | 0.582 | 0.1401 | 0.081* | |
C6 | 0.1495 (4) | 0.4881 (3) | 0.0816 (3) | 0.0511 (11) | |
H6A | 0.1592 | 0.4459 | 0.0381 | 0.061* | |
H6B | 0.0939 | 0.5301 | 0.0554 | 0.061* | |
C7 | −0.0189 (4) | 0.4034 (3) | 0.1253 (3) | 0.0471 (10) | |
H7A | −0.0133 | 0.3708 | 0.0735 | 0.057* | |
H7B | −0.0794 | 0.4462 | 0.1116 | 0.057* | |
C8 | 0.3874 (4) | 0.3792 (3) | 0.2934 (3) | 0.0607 (13) | |
H8A | 0.4432 | 0.4155 | 0.3284 | 0.073* | |
H8B | 0.4311 | 0.3442 | 0.2578 | 0.073* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Pd | 0.03525 (19) | 0.03707 (19) | 0.04042 (18) | −0.00223 (15) | 0.00162 (13) | 0.00658 (14) |
Br | 0.0634 (4) | 0.0669 (4) | 0.0673 (3) | −0.0170 (3) | 0.0001 (3) | 0.0279 (3) |
P1 | 0.0350 (6) | 0.0415 (6) | 0.0425 (6) | 0.0009 (5) | 0.0010 (5) | 0.0045 (5) |
P2 | 0.0359 (6) | 0.0443 (6) | 0.0474 (6) | −0.0029 (5) | −0.0041 (5) | 0.0087 (5) |
C11 | 0.047 (3) | 0.052 (3) | 0.045 (2) | −0.008 (2) | −0.002 (2) | −0.004 (2) |
C12 | 0.050 (3) | 0.054 (3) | 0.067 (3) | 0.002 (2) | 0.015 (2) | −0.004 (2) |
C21 | 0.044 (3) | 0.065 (3) | 0.079 (3) | 0.005 (2) | 0.001 (3) | 0.012 (3) |
C22 | 0.067 (4) | 0.074 (4) | 0.058 (3) | −0.013 (3) | −0.005 (3) | −0.007 (3) |
C111 | 0.074 (4) | 0.064 (3) | 0.071 (3) | 0.003 (3) | −0.007 (3) | −0.016 (3) |
C112 | 0.070 (4) | 0.077 (4) | 0.062 (3) | −0.009 (3) | −0.012 (3) | −0.005 (3) |
C113 | 0.082 (4) | 0.068 (4) | 0.070 (3) | −0.034 (3) | −0.003 (3) | 0.007 (3) |
C121 | 0.082 (4) | 0.055 (3) | 0.096 (4) | 0.008 (3) | 0.035 (3) | −0.017 (3) |
C122 | 0.056 (3) | 0.088 (4) | 0.112 (5) | 0.033 (3) | 0.014 (3) | 0.003 (4) |
C123 | 0.079 (4) | 0.089 (4) | 0.075 (4) | 0.007 (3) | 0.040 (3) | −0.003 (3) |
C211 | 0.088 (5) | 0.071 (4) | 0.140 (6) | 0.019 (4) | 0.025 (4) | 0.050 (4) |
C212 | 0.051 (3) | 0.078 (4) | 0.131 (5) | 0.024 (3) | 0.003 (3) | 0.006 (4) |
C213 | 0.103 (5) | 0.074 (4) | 0.110 (5) | 0.027 (4) | −0.014 (4) | −0.031 (4) |
C221 | 0.106 (6) | 0.164 (7) | 0.061 (4) | −0.048 (5) | 0.027 (4) | −0.029 (4) |
C222 | 0.133 (6) | 0.093 (5) | 0.080 (4) | 0.009 (5) | −0.003 (4) | −0.028 (4) |
C223 | 0.084 (5) | 0.120 (6) | 0.082 (4) | −0.025 (4) | −0.029 (3) | −0.007 (4) |
C1 | 0.050 (3) | 0.056 (3) | 0.051 (3) | −0.003 (2) | 0.006 (2) | 0.012 (2) |
C2 | 0.046 (3) | 0.047 (3) | 0.044 (2) | −0.003 (2) | 0.0064 (19) | 0.011 (2) |
C3 | 0.040 (2) | 0.053 (3) | 0.052 (3) | −0.011 (2) | −0.003 (2) | 0.011 (2) |
C4 | 0.052 (3) | 0.049 (3) | 0.071 (3) | −0.017 (2) | 0.013 (2) | 0.012 (2) |
C5 | 0.075 (4) | 0.064 (3) | 0.064 (3) | −0.019 (3) | 0.008 (3) | 0.014 (3) |
C6 | 0.056 (3) | 0.044 (3) | 0.052 (3) | −0.004 (2) | 0.006 (2) | 0.010 (2) |
C7 | 0.039 (2) | 0.046 (3) | 0.055 (3) | 0.001 (2) | 0.003 (2) | 0.008 (2) |
C8 | 0.041 (3) | 0.065 (3) | 0.075 (3) | −0.009 (2) | 0.003 (2) | 0.014 (3) |
Pd—C2 | 2.082 (4) | C211—H21D | 0.96 |
Pd—P2 | 2.3097 (11) | C211—H21E | 0.96 |
Pd—P1 | 2.3211 (11) | C211—H21F | 0.96 |
Pd—Br | 2.5678 (5) | C212—H21G | 0.96 |
P1—C7 | 1.829 (4) | C212—H21H | 0.96 |
P1—C12 | 1.873 (5) | C212—H21I | 0.96 |
P1—C11 | 1.891 (4) | C213—H21A | 0.96 |
P2—C8 | 1.843 (5) | C213—H21B | 0.96 |
P2—C22 | 1.878 (5) | C213—H21C | 0.96 |
P2—C21 | 1.883 (5) | C221—H22G | 0.96 |
C11—C113 | 1.514 (6) | C221—H22H | 0.96 |
C11—C111 | 1.527 (7) | C221—H22I | 0.96 |
C11—C112 | 1.536 (6) | C222—H22D | 0.96 |
C12—C122 | 1.522 (7) | C222—H22E | 0.96 |
C12—C123 | 1.525 (7) | C222—H22F | 0.96 |
C12—C121 | 1.532 (7) | C223—H22A | 0.96 |
C21—C212 | 1.528 (7) | C223—H22B | 0.96 |
C21—C213 | 1.534 (8) | C223—H22C | 0.96 |
C21—C211 | 1.541 (8) | C1—C2 | 1.504 (6) |
C22—C221 | 1.497 (8) | C1—C7 | 1.510 (6) |
C22—C223 | 1.536 (7) | C1—C6 | 1.520 (6) |
C22—C222 | 1.549 (8) | C1—H1 | 0.98 |
C111—H11D | 0.96 | C2—C3 | 1.505 (6) |
C111—H11E | 0.96 | C2—H2 | 0.98 |
C111—H11F | 0.96 | C3—C8 | 1.493 (6) |
C112—H11G | 0.96 | C3—C4 | 1.508 (6) |
C112—H11H | 0.96 | C3—H3 | 0.98 |
C112—H11I | 0.96 | C4—C5 | 1.499 (6) |
C113—H11A | 0.96 | C4—H4A | 0.97 |
C113—H11B | 0.96 | C4—H4B | 0.97 |
C113—H11C | 0.96 | C5—C6 | 1.504 (6) |
C121—H12A | 0.96 | C5—H5A | 0.97 |
C121—H12B | 0.96 | C5—H5B | 0.97 |
C121—H12C | 0.96 | C6—H6A | 0.97 |
C122—H12D | 0.96 | C6—H6B | 0.97 |
C122—H12E | 0.96 | C7—H7A | 0.97 |
C122—H12F | 0.96 | C7—H7B | 0.97 |
C123—H12G | 0.96 | C8—H8A | 0.97 |
C123—H12H | 0.96 | C8—H8B | 0.97 |
C123—H12I | 0.96 | ||
C2—Pd—P2 | 83.81 (12) | C21—C211—H21F | 109.5 |
C2—Pd—P1 | 83.47 (12) | H21D—C211—H21F | 109.5 |
P2—Pd—P1 | 166.32 (4) | H21E—C211—H21F | 109.5 |
C2—Pd—Br | 170.61 (13) | C21—C212—H21G | 109.5 |
P2—Pd—Br | 96.53 (3) | C21—C212—H21H | 109.5 |
P1—Pd—Br | 96.85 (3) | H21G—C212—H21H | 109.5 |
C7—P1—C12 | 105.6 (2) | C21—C212—H21I | 109.5 |
C7—P1—C11 | 103.43 (19) | H21G—C212—H21I | 109.5 |
C12—P1—C11 | 111.8 (2) | H21H—C212—H21I | 109.5 |
C7—P1—Pd | 103.31 (14) | C21—C213—H21A | 109.5 |
C12—P1—Pd | 113.64 (16) | C21—C213—H21B | 109.5 |
C11—P1—Pd | 117.32 (15) | H21A—C213—H21B | 109.5 |
C8—P2—C22 | 106.2 (2) | C21—C213—H21C | 109.5 |
C8—P2—C21 | 102.2 (2) | H21A—C213—H21C | 109.5 |
C22—P2—C21 | 112.4 (3) | H21B—C213—H21C | 109.5 |
C8—P2—Pd | 102.91 (15) | C22—C221—H22G | 109.5 |
C22—P2—Pd | 114.03 (18) | C22—C221—H22H | 109.5 |
C21—P2—Pd | 117.12 (17) | H22G—C221—H22H | 109.5 |
C113—C11—C111 | 109.0 (4) | C22—C221—H22I | 109.5 |
C113—C11—C112 | 109.9 (4) | H22G—C221—H22I | 109.5 |
C111—C11—C112 | 107.7 (4) | H22H—C221—H22I | 109.5 |
C113—C11—P1 | 111.7 (3) | C22—C222—H22D | 109.5 |
C111—C11—P1 | 104.7 (3) | C22—C222—H22E | 109.5 |
C112—C11—P1 | 113.5 (3) | H22D—C222—H22E | 109.5 |
C122—C12—C123 | 110.1 (4) | C22—C222—H22F | 109.5 |
C122—C12—C121 | 109.8 (4) | H22D—C222—H22F | 109.5 |
C123—C12—C121 | 106.3 (4) | H22E—C222—H22F | 109.5 |
C122—C12—P1 | 113.9 (3) | C22—C223—H22A | 109.5 |
C123—C12—P1 | 110.1 (3) | C22—C223—H22B | 109.5 |
C121—C12—P1 | 106.3 (3) | H22A—C223—H22B | 109.5 |
C212—C21—C213 | 109.4 (5) | C22—C223—H22C | 109.5 |
C212—C21—C211 | 108.6 (5) | H22A—C223—H22C | 109.5 |
C213—C21—C211 | 107.5 (5) | H22B—C223—H22C | 109.5 |
C212—C21—P2 | 113.9 (4) | C2—C1—C7 | 113.6 (4) |
C213—C21—P2 | 105.1 (4) | C2—C1—C6 | 112.0 (4) |
C211—C21—P2 | 112.0 (4) | C7—C1—C6 | 112.2 (3) |
C221—C22—C223 | 109.8 (5) | C2—C1—H1 | 106.1 |
C221—C22—C222 | 109.3 (5) | C7—C1—H1 | 106.1 |
C223—C22—C222 | 106.5 (5) | C6—C1—H1 | 106.1 |
C221—C22—P2 | 110.3 (4) | C1—C2—C3 | 112.3 (4) |
C223—C22—P2 | 114.7 (4) | C1—C2—Pd | 116.7 (3) |
C222—C22—P2 | 105.9 (4) | C3—C2—Pd | 117.2 (3) |
C11—C111—H11D | 109.5 | C1—C2—H2 | 102.6 |
C11—C111—H11E | 109.5 | C3—C2—H2 | 102.6 |
H11D—C111—H11E | 109.5 | Pd—C2—H2 | 102.6 |
C11—C111—H11F | 109.5 | C8—C3—C2 | 113.8 (4) |
H11D—C111—H11F | 109.5 | C8—C3—C4 | 113.6 (4) |
H11E—C111—H11F | 109.5 | C2—C3—C4 | 112.7 (3) |
C11—C112—H11G | 109.5 | C8—C3—H3 | 105.2 |
C11—C112—H11H | 109.5 | C2—C3—H3 | 105.2 |
H11G—C112—H11H | 109.5 | C4—C3—H3 | 105.2 |
C11—C112—H11I | 109.5 | C5—C4—C3 | 114.0 (4) |
H11G—C112—H11I | 109.5 | C5—C4—H4A | 108.7 |
H11H—C112—H11I | 109.5 | C3—C4—H4A | 108.7 |
C11—C113—H11A | 109.5 | C5—C4—H4B | 108.7 |
C11—C113—H11B | 109.5 | C3—C4—H4B | 108.7 |
H11A—C113—H11B | 109.5 | H4A—C4—H4B | 107.6 |
C11—C113—H11C | 109.5 | C4—C5—C6 | 113.1 (4) |
H11A—C113—H11C | 109.5 | C4—C5—H5A | 109 |
H11B—C113—H11C | 109.5 | C6—C5—H5A | 109 |
C12—C121—H12A | 109.5 | C4—C5—H5B | 109 |
C12—C121—H12B | 109.5 | C6—C5—H5B | 109 |
H12A—C121—H12B | 109.5 | H5A—C5—H5B | 107.8 |
C12—C121—H12C | 109.5 | C5—C6—C1 | 113.8 (4) |
H12A—C121—H12C | 109.5 | C5—C6—H6A | 108.8 |
H12B—C121—H12C | 109.5 | C1—C6—H6A | 108.8 |
C12—C122—H12D | 109.5 | C5—C6—H6B | 108.8 |
C12—C122—H12E | 109.5 | C1—C6—H6B | 108.8 |
H12D—C122—H12E | 109.5 | H6A—C6—H6B | 107.7 |
C12—C122—H12F | 109.5 | C1—C7—P1 | 109.9 (3) |
H12D—C122—H12F | 109.5 | C1—C7—H7A | 109.7 |
H12E—C122—H12F | 109.5 | P1—C7—H7A | 109.7 |
C12—C123—H12G | 109.5 | C1—C7—H7B | 109.7 |
C12—C123—H12H | 109.5 | P1—C7—H7B | 109.7 |
H12G—C123—H12H | 109.5 | H7A—C7—H7B | 108.2 |
C12—C123—H12I | 109.5 | C3—C8—P2 | 110.8 (3) |
H12G—C123—H12I | 109.5 | C3—C8—H8A | 109.5 |
H12H—C123—H12I | 109.5 | P2—C8—H8A | 109.5 |
C21—C211—H21D | 109.5 | C3—C8—H8B | 109.5 |
C21—C211—H21E | 109.5 | P2—C8—H8B | 109.5 |
H21D—C211—H21E | 109.5 | H8A—C8—H8B | 108.1 |
C2—Pd—P1—C7 | 1.49 (19) | C8—P2—C21—C211 | 165.7 (4) |
P2—Pd—P1—C7 | 23.1 (3) | C22—P2—C21—C211 | 52.2 (5) |
Br—Pd—P1—C7 | −169.05 (15) | Pd—P2—C21—C211 | −82.7 (4) |
C2—Pd—P1—C12 | −112.5 (2) | C8—P2—C22—C221 | 171.7 (4) |
P2—Pd—P1—C12 | −90.8 (2) | C21—P2—C22—C221 | −77.3 (5) |
Br—Pd—P1—C12 | 77.00 (17) | Pd—P2—C22—C221 | 59.1 (5) |
C2—Pd—P1—C11 | 114.5 (2) | C8—P2—C22—C223 | −63.6 (5) |
P2—Pd—P1—C11 | 136.2 (2) | C21—P2—C22—C223 | 47.4 (5) |
Br—Pd—P1—C11 | −56.04 (16) | Pd—P2—C22—C223 | −176.2 (4) |
C2—Pd—P2—C8 | −1.5 (2) | C8—P2—C22—C222 | 53.5 (4) |
P1—Pd—P2—C8 | −23.1 (3) | C21—P2—C22—C222 | 164.5 (4) |
Br—Pd—P2—C8 | 169.09 (18) | Pd—P2—C22—C222 | −59.1 (4) |
C2—Pd—P2—C22 | 113.1 (2) | C7—C1—C2—C3 | −179.1 (4) |
P1—Pd—P2—C22 | 91.5 (3) | C6—C1—C2—C3 | 52.5 (5) |
Br—Pd—P2—C22 | −76.3 (2) | C7—C1—C2—Pd | −39.8 (5) |
C2—Pd—P2—C21 | −112.7 (2) | C6—C1—C2—Pd | −168.2 (3) |
P1—Pd—P2—C21 | −134.3 (2) | P2—Pd—C2—C1 | −155.5 (3) |
Br—Pd—P2—C21 | 57.87 (19) | P1—Pd—C2—C1 | 19.5 (3) |
C7—P1—C11—C113 | −164.7 (4) | Br—Pd—C2—C1 | 112.0 (7) |
C12—P1—C11—C113 | −51.5 (4) | P2—Pd—C2—C3 | −18.2 (3) |
Pd—P1—C11—C113 | 82.3 (4) | P1—Pd—C2—C3 | 156.8 (3) |
C7—P1—C11—C111 | 77.5 (3) | Br—Pd—C2—C3 | −110.7 (7) |
C12—P1—C11—C111 | −169.3 (3) | C1—C2—C3—C8 | 176.3 (4) |
Pd—P1—C11—C111 | −35.5 (3) | Pd—C2—C3—C8 | 37.2 (5) |
C7—P1—C11—C112 | −39.7 (4) | C1—C2—C3—C4 | −52.3 (5) |
C12—P1—C11—C112 | 73.5 (4) | Pd—C2—C3—C4 | 168.6 (3) |
Pd—P1—C11—C112 | −152.7 (3) | C8—C3—C4—C5 | −178.7 (4) |
C7—P1—C12—C122 | 67.1 (4) | C2—C3—C4—C5 | 49.8 (6) |
C11—P1—C12—C122 | −44.7 (4) | C3—C4—C5—C6 | −47.3 (6) |
Pd—P1—C12—C122 | 179.7 (3) | C4—C5—C6—C1 | 47.8 (6) |
C7—P1—C12—C123 | −168.7 (4) | C2—C1—C6—C5 | −50.6 (6) |
C11—P1—C12—C123 | 79.5 (4) | C7—C1—C6—C5 | −179.7 (4) |
Pd—P1—C12—C123 | −56.1 (4) | C2—C1—C7—P1 | 38.6 (5) |
C7—P1—C12—C121 | −53.8 (4) | C6—C1—C7—P1 | 166.9 (3) |
C11—P1—C12—C121 | −165.7 (3) | C12—P1—C7—C1 | 98.3 (3) |
Pd—P1—C12—C121 | 58.7 (4) | C11—P1—C7—C1 | −144.1 (3) |
C8—P2—C21—C212 | 41.9 (5) | Pd—P1—C7—C1 | −21.3 (3) |
C22—P2—C21—C212 | −71.6 (5) | C2—C3—C8—P2 | −36.3 (5) |
Pd—P2—C21—C212 | 153.5 (4) | C4—C3—C8—P2 | −167.2 (3) |
C8—P2—C21—C213 | −77.9 (4) | C22—P2—C8—C3 | −99.9 (4) |
C22—P2—C21—C213 | 168.6 (4) | C21—P2—C8—C3 | 142.2 (4) |
Pd—P2—C21—C213 | 33.7 (4) | Pd—P2—C8—C3 | 20.3 (4) |
Experimental details
Crystal data | |
Chemical formula | [PdBr(C24H49P2)] |
Mr | 585.88 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 11.4392 (2), 15.7757 (2), 15.6508 (2) |
β (°) | 97.846 (2) |
V (Å3) | 2797.92 (7) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.21 |
Crystal size (mm) | 0.25 × 0.13 × 0.05 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2006) |
Tmin, Tmax | 0.608, 0.897 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 22034, 6739, 3849 |
Rint | 0.046 |
(sin θ/λ)max (Å−1) | 0.661 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.041, 0.122, 0.94 |
No. of reflections | 6739 |
No. of parameters | 265 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.22, −0.62 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2006), CrysAlis RED (Oxford Diffraction, 2006), CrysAlis RED, SIR97 (Altomare et al., 1999), SHELXL97 (Sheldrick, 1997), DIAMOND (Brandenburg, 2000), WinGX (Farrugia, 1999).
Pd—C2 | 2.082 (4) | Pd—P1 | 2.3211 (11) |
Pd—P2 | 2.3097 (11) | Pd—Br | 2.5678 (5) |
C2—Pd—P2 | 83.81 (12) | P2—Pd—Br | 96.53 (3) |
C2—Pd—P1 | 83.47 (12) | P1—Pd—Br | 96.85 (3) |
P2—Pd—P1 | 166.32 (4) | C22—P2—C21 | 112.4 (3) |
C2—Pd—Br | 170.61 (13) |
The title compound belongs to a family of C-sp3-H activated PCP complexes that show interesting catalytic performance in C—C coupling reactions (Ohff et al.,1997; Sjövall et al., 2002; Nilsson & Wendt, 2005). The iodide and trifluoroacetate analogues have previously been prepared and the crystal structure of the iodide described (Sjövall et al., 2002).
The vast majority of reported palladium (PCP)-complexes are constructed with an aromatic back-bone. The aliphatic based complexes, such as the iodide compound mentioned, are studied in recent publications on PCP)-type of compounds coordinated to metals such as rhodium (Kuznetsov et al., 2006) and nickel (Castonguay et al., 2006; Pandarus et al., 2007).
The title compound exhibits a pseudo-square-planar geometry with the phosphorus atoms positioned trans to each other with a P1—Pd—P2 angle of 166.32 (4) °. Coordination of the (PCP)-tridentate ligand leads to the formation of two five-membered rings. The distortion, manifested in the repulsion of the P1 and P2 from the σ-donating bromine atom, results in acute angles for the bis-chelating system.
For the coordination plane formed by Pd, P1, C2 and P2 the largest deviation from this plane is observed for Pd, at 0.0690 (7) Å (r.m.s. of fitted atoms = 0.0445). The Br lies out out of the plane by 0.560 (6) Å. There are intramolecular H···Br contacts: C113—H···Br, 156.62 °, H···Br, 2.852 Å and C211—H···Br, 154.93 °, H···Br, 2.860 Å. The mean plane of the cyclohexane ring is aligned with the palladium coordination plane owing to C—H activation in an equatorial position. Perpendicular to the coordination plane is a pseudo-mirror plane through atoms Br1, Pd1, C2 and C5. Selected bond lengths and angles are given in Table 1.
Comparison of the title compound (I) to the analogous iodo-complex indicates the expected Pd-halogen bond distance decreases by 0.2 Å. Also noted is the lower trans-influence of the bromide on the Pd—C2 bond distance with a ca 0.05 Å decrease as compared with that in the the iodine complex.