metal-organic compounds
trans-Bromido(pyrimidinyl-κC2)bis(triphenylphosphane-κP)palladium(II)
aInstrumentation Center, College of Science, National Taiwan University, Taipei 106, Taiwan, and bDepartment of Applied Cosmetology, Hungkuang University, Shalu 433, Taichung, Taiwan
*Correspondence e-mail: ghlee@ntu.edu.tw, khyih@sunrise.hk.edu.tw
In the title complex, [PdBr(C4H3N2)(C18H15P)2], the geometry around the PdII atom is distorted square-planar with the PdII atom displaced by 0.0150 (5) Å from the least-squares BrP2C plane. Two PPh3 ligands are in trans positions [P—Pd—P = 176.743 (17)°], while the pyrimidinyl ligand and Br atom are trans to one another [C—Pd—Br = 176.56 (5)°]. Structural parameters from NMR, IR and mass spectra are in agreement with the of the title compound.
Related literature
For reactions in organic synthesis that form C—C bonds, see: Steffen et al. (2005); Beeby et al. (2004); Chin et al. (1988); Dobrzynski & Angelici (1975). For Pd—C(carbene) bond lengths, see: Cardin et al. (1972) and for Pd—Br bond lengths, see: Yih & Lee (2008); Yih et al. (2009). For 4,6-dimethyl-2-mercaptopyrimidine, see: Hong et al. (2002).
Experimental
Crystal data
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Data collection: SMART (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; 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/S1600536810038511/jh2211sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810038511/jh2211Isup2.hkl
The synthesis of the title compound (I) was carried out as follows. 2-Bromo-pyrimidine (0.191 g, 1.2 mmol) was added to a flask (100 ml) containing Pd(PPh3)4 (1.155 g, 1.0 mmol) and CH2Cl2 (20 ml) at ambient temperature. The mixture was stirred for 2 h. The solvent was concentrated to 10 ml, and 20 ml of diethyl ether was added to the solution. The pale-yellow solids were formed which were isolated by filtration (G4), washed with n-hexane (2 x 10 ml) and subsequently dried under vacuum yielding 0.750 g (95%) of the complex [Pd(PPh3)2(C4H3N2)Br], (I). Spectroscopic data for (I): 31P{1H} NMR: δ 21.4 (s, PPh3). 1H NMR: δ 7.23–7.66 (m, 30H, 2PPh3), 7.52 (s, 1H, 5-H of pyrimidinyl), 7.86 (s, 2H, 4-H of pyrimidinyl). 13C{1H} NMR: δ 128.0 (m, o-C of Ph), 129.9 (m, p-C of Ph), 134.8 (m, m-C of Ph), 114.2 (s, 4-C of pyrimidinyl), 154.4 (s, 5-C of pyrimidinyl). MS (FAB, NBA, m/z): 789 [M+]. Anal. Calcd. for C40H33BrN2P2Pd: C, 60.82; H, 4.21; N, 3.55. Found: C, 60.94; H, 4.31; N, 3.18.
H atoms were positioned geometrically and refined using a riding model, with C—H = 0.95 Å and with Uiso(H) = 1.2 times Ueq(C).
C—C coupling reactions of pyrimidinyl nickel complexes (Steffen et al., 2005), Suzuki cross-coupling reactions of pyridyl-bridged palladium complex (Beeby, et al., 2004), and intramolecular
of Pd—N binuclear complex [Pd(µ-C9H6N)(µ-dppm)]2(Cl)2 (Chin et al., 1988) are some of important reactions in organic synthesis by forming C—C bond (Dobrzynski & Angelici, 1975). To our knowledge, no 2-palladiumpyrimidine has been described.To synthesis of 2-palladiumpyrimidine compound, complex [Pd(PPh3)4] was used to react with 2-bromopyrimidine in dichloromethane at room temperature. As a result, a two triphenylphosphine displaced complex [Pd(Br)(C4H3N2)(PPh3)2] was isolated with 95% yield. The X-ray
analysis has been carried out to provide structural parameters.The molecular structure of the title compound is shown in Fig. 1. In the title complex (I), the palladium atom has a distorted square planar geometry. The palladium atom is displaced by 0.0150 (5)Å from the least-squares plane of BrP1P2C1. The Pd—C1 bond distance, 1.9985 (18) Å, is longer than other PdII-carbon(carbonyl) distances, and similar to those of Pd—C(carbene) distances (Cardin et al., 1972, and references therein). Two PPh3 ligands are in trans position: P1—Pd—P2, 176.743 (17)°, while the pyrimidinyl ligand and bromide are trans to each other: C1—Pd—Br1, 176.56 (5)°. The Pd—N bond distances (2.8489 (17) and 2.8703 (16) Å) indicate no bonding interaction between the nitrogen atom and palladium metal atom. Within the pyrimidinyl ligand itself, the geometry is consistent with a significant partial double bond character in the C—C and C—N bond. The C—N bond distances (1.330 (2) ~1.340 (3) Å) are typical for a C—N bond having partial double bond character and are certainly much shorter than the normal C—N (1.47 Å) single bond. The Pd—C1 (1.9985 (18) Å) and Pd—Br (2.5353 (3) Å) lengths of (I) are in agreement with reported value (Yih et al., 2008, 2009).
The 31P{1H} NMR spectra of (I) shows a singlet resonances at δ 21.4. In the 1H NMR spectra, the 4-H and 5-H protons of the pyrimidinyl group exhibit two singlet resonances at δ 7.86 and at δ 7.52. The 13C{1H} NMR spectra of (I) reveals two singlet at δ 114.2 and at δ 154.4 which are assigned to the 5-C and 4-C carbon atom of the pyrimidinyl group. It is also noted the IR spectrum of the title complex (I) shows two stretching bands at 1546 and 1537 cm-1 for C═N groups. In the FAB mass spectra, base peak with the typical Pd isotope distribution is in agreement with the [M+] molecular mass of (I).
For reactions in organic synthesis that form C—C bonds, see: Steffen et al. (2005); Beeby et al. (2004); Chin et al. (1988); Dobrzynski & Angelici (1975). For Pd—C(carbene) bond lengths, see: Cardin et al. (1972) and fir Pd—Br bondlengths, see: Yih & Lee (2008); Yih et al. (2009). For related literature [on what subject?], see: Hong et al. (2002).
Data collection: SMART (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. The molecular structure of title compound, with atom labels and 50% probability displacement ellipsoids for non-H atoms. |
[PdBr(C4H3N2)(C18H15P)2] | Z = 2 |
Mr = 789.93 | F(000) = 796 |
Triclinic, P1 | Dx = 1.549 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 12.1051 (8) Å | Cell parameters from 5205 reflections |
b = 12.7791 (8) Å | θ = 2.2–27.5° |
c = 12.8987 (8) Å | µ = 1.86 mm−1 |
α = 90.257 (2)° | T = 150 K |
β = 117.044 (2)° | Rod, light yellow |
γ = 105.580 (2)° | 0.50 × 0.35 × 0.25 mm |
V = 1693.11 (19) Å3 |
Bruker SMART APEX CCD area-detector diffractometer | 7762 independent reflections |
Radiation source: fine-focus sealed tube | 7066 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.023 |
ω scans | θmax = 27.5°, θmin = 1.9° |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | h = −15→15 |
Tmin = 0.457, Tmax = 0.654 | k = −16→16 |
22016 measured reflections | l = −16→16 |
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)] = 0.023 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.058 | H-atom parameters constrained |
S = 1.02 | w = 1/[σ2(Fo2) + (0.0252P)2 + 0.8169P] where P = (Fo2 + 2Fc2)/3 |
7762 reflections | (Δ/σ)max = 0.003 |
415 parameters | Δρmax = 0.40 e Å−3 |
2 restraints | Δρmin = −0.40 e Å−3 |
[PdBr(C4H3N2)(C18H15P)2] | γ = 105.580 (2)° |
Mr = 789.93 | V = 1693.11 (19) Å3 |
Triclinic, P1 | Z = 2 |
a = 12.1051 (8) Å | Mo Kα radiation |
b = 12.7791 (8) Å | µ = 1.86 mm−1 |
c = 12.8987 (8) Å | T = 150 K |
α = 90.257 (2)° | 0.50 × 0.35 × 0.25 mm |
β = 117.044 (2)° |
Bruker SMART APEX CCD area-detector diffractometer | 7762 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2001) | 7066 reflections with I > 2σ(I) |
Tmin = 0.457, Tmax = 0.654 | Rint = 0.023 |
22016 measured reflections |
R[F2 > 2σ(F2)] = 0.023 | 2 restraints |
wR(F2) = 0.058 | H-atom parameters constrained |
S = 1.02 | Δρmax = 0.40 e Å−3 |
7762 reflections | Δρmin = −0.40 e Å−3 |
415 parameters |
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 | ||
Pd | 0.373889 (12) | 0.223763 (11) | 0.271056 (12) | 0.01685 (4) | |
Br | 0.402981 (18) | 0.428222 (15) | 0.282253 (18) | 0.02526 (5) | |
P1 | 0.16970 (4) | 0.18272 (4) | 0.26328 (4) | 0.01688 (9) | |
P2 | 0.57904 (4) | 0.25675 (4) | 0.28544 (4) | 0.01794 (9) | |
N1 | 0.31551 (17) | 0.01119 (14) | 0.15413 (15) | 0.0285 (4) | |
N2 | 0.40272 (16) | 0.02238 (14) | 0.36125 (15) | 0.0265 (4) | |
C1 | 0.36051 (17) | 0.06436 (15) | 0.26102 (16) | 0.0195 (3) | |
C2 | 0.3112 (2) | −0.09446 (18) | 0.1485 (2) | 0.0391 (5) | |
H2 | 0.2787 | −0.1355 | 0.0736 | 0.047* | |
C3 | 0.3515 (2) | −0.14614 (18) | 0.2462 (2) | 0.0387 (5) | |
H3 | 0.3476 | −0.2213 | 0.2406 | 0.046* | |
C4 | 0.3980 (2) | −0.08343 (17) | 0.35255 (19) | 0.0324 (5) | |
H4 | 0.4277 | −0.1162 | 0.4222 | 0.039* | |
C5 | 0.06796 (17) | 0.03960 (15) | 0.21717 (16) | 0.0191 (4) | |
C6 | 0.10631 (19) | −0.03726 (16) | 0.29124 (17) | 0.0245 (4) | |
H6 | 0.1829 | −0.0140 | 0.3651 | 0.029* | |
C7 | 0.0338 (2) | −0.14719 (17) | 0.25813 (19) | 0.0298 (4) | |
H7 | 0.0612 | −0.1993 | 0.3086 | 0.036* | |
C8 | −0.0787 (2) | −0.18086 (17) | 0.1512 (2) | 0.0323 (5) | |
H8 | −0.1295 | −0.2560 | 0.1289 | 0.039* | |
C9 | −0.1176 (2) | −0.10562 (16) | 0.07663 (18) | 0.0284 (4) | |
H9 | −0.1946 | −0.1292 | 0.0031 | 0.034* | |
C10 | −0.04417 (18) | 0.00417 (15) | 0.10901 (17) | 0.0216 (4) | |
H10 | −0.0705 | 0.0555 | 0.0571 | 0.026* | |
C11 | 0.06149 (17) | 0.25643 (14) | 0.16714 (16) | 0.0190 (4) | |
C12 | −0.04724 (18) | 0.26179 (15) | 0.17709 (17) | 0.0237 (4) | |
H12 | −0.0637 | 0.2294 | 0.2368 | 0.028* | |
C13 | −0.13095 (19) | 0.31432 (16) | 0.10011 (18) | 0.0269 (4) | |
H13 | −0.2045 | 0.3179 | 0.1075 | 0.032* | |
C14 | −0.1082 (2) | 0.36161 (16) | 0.01236 (18) | 0.0293 (4) | |
H14 | −0.1657 | 0.3977 | −0.0401 | 0.035* | |
C15 | −0.0016 (2) | 0.35582 (17) | 0.00179 (18) | 0.0295 (4) | |
H15 | 0.0137 | 0.3873 | −0.0589 | 0.035* | |
C16 | 0.08367 (19) | 0.30429 (15) | 0.07917 (17) | 0.0233 (4) | |
H16 | 0.1576 | 0.3018 | 0.0719 | 0.028* | |
C17 | 0.18063 (17) | 0.21461 (15) | 0.40637 (16) | 0.0198 (4) | |
C18 | 0.08158 (18) | 0.15884 (16) | 0.43204 (17) | 0.0230 (4) | |
H18 | 0.0093 | 0.1015 | 0.3757 | 0.028* | |
C19 | 0.08851 (19) | 0.18684 (17) | 0.53916 (17) | 0.0257 (4) | |
H19 | 0.0212 | 0.1487 | 0.5563 | 0.031* | |
C20 | 0.1937 (2) | 0.27055 (17) | 0.62123 (17) | 0.0275 (4) | |
H20 | 0.1983 | 0.2897 | 0.6947 | 0.033* | |
C21 | 0.2918 (2) | 0.32624 (17) | 0.59664 (18) | 0.0300 (4) | |
H21 | 0.3635 | 0.3839 | 0.6530 | 0.036* | |
C22 | 0.28583 (19) | 0.29816 (16) | 0.48958 (17) | 0.0256 (4) | |
H22 | 0.3539 | 0.3362 | 0.4733 | 0.031* | |
C23 | 0.63295 (17) | 0.14058 (15) | 0.26504 (17) | 0.0205 (4) | |
C24 | 0.63245 (19) | 0.10873 (16) | 0.16108 (17) | 0.0242 (4) | |
H24 | 0.6049 | 0.1493 | 0.0974 | 0.029* | |
C25 | 0.6716 (2) | 0.01883 (17) | 0.14949 (19) | 0.0304 (4) | |
H25 | 0.6705 | −0.0020 | 0.0782 | 0.036* | |
C26 | 0.7119 (2) | −0.04028 (17) | 0.2415 (2) | 0.0323 (5) | |
H26 | 0.7402 | −0.1011 | 0.2342 | 0.039* | |
C27 | 0.7112 (2) | −0.01134 (18) | 0.3444 (2) | 0.0337 (5) | |
H27 | 0.7370 | −0.0534 | 0.4070 | 0.040* | |
C28 | 0.67292 (19) | 0.07904 (17) | 0.35664 (18) | 0.0270 (4) | |
H28 | 0.6740 | 0.0991 | 0.4282 | 0.032* | |
C29 | 0.71134 (17) | 0.33035 (15) | 0.42804 (16) | 0.0213 (4) | |
C30 | 0.84045 (18) | 0.34118 (16) | 0.45735 (18) | 0.0260 (4) | |
H30 | 0.8595 | 0.3091 | 0.4033 | 0.031* | |
C31 | 0.9408 (2) | 0.39853 (17) | 0.56511 (19) | 0.0316 (5) | |
H31 | 1.0286 | 0.4063 | 0.5843 | 0.038* | |
C32 | 0.9138 (2) | 0.44424 (18) | 0.6445 (2) | 0.0379 (5) | |
H32 | 0.9828 | 0.4835 | 0.7183 | 0.045* | |
C33 | 0.7862 (2) | 0.4330 (2) | 0.6167 (2) | 0.0397 (5) | |
H33 | 0.7677 | 0.4645 | 0.6715 | 0.048* | |
C34 | 0.6852 (2) | 0.37604 (18) | 0.50921 (18) | 0.0311 (5) | |
H34 | 0.5977 | 0.3682 | 0.4909 | 0.037* | |
C35 | 0.59335 (18) | 0.33938 (15) | 0.17515 (17) | 0.0210 (4) | |
C36 | 0.5034 (2) | 0.29949 (17) | 0.05672 (18) | 0.0282 (4) | |
H36 | 0.4329 | 0.2344 | 0.0366 | 0.034* | |
C37 | 0.5167 (2) | 0.3544 (2) | −0.0311 (2) | 0.0376 (5) | |
H37 | 0.4576 | 0.3251 | −0.1114 | 0.045* | |
C38 | 0.6157 (3) | 0.4516 (2) | −0.0027 (2) | 0.0406 (6) | |
H38 | 0.6243 | 0.4893 | −0.0631 | 0.049* | |
C39 | 0.7017 (2) | 0.49357 (18) | 0.1138 (2) | 0.0362 (5) | |
H39 | 0.7687 | 0.5611 | 0.1333 | 0.043* | |
C40 | 0.6914 (2) | 0.43795 (16) | 0.20293 (19) | 0.0263 (4) | |
H40 | 0.7514 | 0.4674 | 0.2829 | 0.032* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Pd | 0.01563 (7) | 0.01653 (7) | 0.01959 (7) | 0.00490 (5) | 0.00931 (6) | 0.00247 (5) |
Br | 0.02570 (10) | 0.01863 (9) | 0.03430 (11) | 0.00637 (7) | 0.01675 (9) | 0.00424 (8) |
P1 | 0.0163 (2) | 0.0174 (2) | 0.0180 (2) | 0.00520 (17) | 0.00902 (18) | 0.00283 (17) |
P2 | 0.0165 (2) | 0.0182 (2) | 0.0203 (2) | 0.00569 (17) | 0.00951 (18) | 0.00209 (18) |
N1 | 0.0332 (9) | 0.0225 (8) | 0.0243 (9) | 0.0072 (7) | 0.0099 (7) | 0.0001 (7) |
N2 | 0.0291 (9) | 0.0254 (8) | 0.0253 (8) | 0.0116 (7) | 0.0114 (7) | 0.0066 (7) |
C1 | 0.0158 (8) | 0.0193 (7) | 0.0242 (9) | 0.0059 (7) | 0.0099 (7) | 0.0045 (7) |
C2 | 0.0500 (14) | 0.0248 (11) | 0.0315 (12) | 0.0091 (10) | 0.0115 (10) | −0.0059 (9) |
C3 | 0.0465 (13) | 0.0196 (10) | 0.0445 (13) | 0.0125 (9) | 0.0157 (11) | 0.0042 (9) |
C4 | 0.0352 (11) | 0.0293 (11) | 0.0328 (11) | 0.0143 (9) | 0.0136 (9) | 0.0122 (9) |
C5 | 0.0199 (8) | 0.0179 (8) | 0.0240 (9) | 0.0051 (7) | 0.0144 (7) | 0.0024 (7) |
C6 | 0.0286 (10) | 0.0256 (10) | 0.0249 (10) | 0.0107 (8) | 0.0160 (8) | 0.0064 (8) |
C7 | 0.0473 (13) | 0.0226 (10) | 0.0344 (11) | 0.0138 (9) | 0.0298 (10) | 0.0100 (8) |
C8 | 0.0459 (13) | 0.0191 (10) | 0.0392 (12) | 0.0011 (9) | 0.0308 (11) | 0.0006 (9) |
C9 | 0.0296 (10) | 0.0249 (10) | 0.0280 (10) | 0.0009 (8) | 0.0156 (9) | −0.0040 (8) |
C10 | 0.0237 (9) | 0.0208 (9) | 0.0239 (9) | 0.0074 (7) | 0.0137 (8) | 0.0032 (7) |
C11 | 0.0183 (8) | 0.0162 (8) | 0.0199 (9) | 0.0051 (7) | 0.0070 (7) | −0.0008 (7) |
C12 | 0.0240 (9) | 0.0227 (9) | 0.0265 (10) | 0.0085 (8) | 0.0127 (8) | 0.0033 (8) |
C13 | 0.0222 (9) | 0.0234 (10) | 0.0342 (11) | 0.0093 (8) | 0.0113 (8) | −0.0004 (8) |
C14 | 0.0286 (10) | 0.0204 (9) | 0.0316 (11) | 0.0109 (8) | 0.0064 (9) | 0.0039 (8) |
C15 | 0.0353 (11) | 0.0259 (10) | 0.0277 (10) | 0.0111 (9) | 0.0142 (9) | 0.0095 (8) |
C16 | 0.0241 (9) | 0.0216 (9) | 0.0241 (9) | 0.0066 (7) | 0.0117 (8) | 0.0030 (7) |
C17 | 0.0209 (9) | 0.0218 (9) | 0.0190 (9) | 0.0085 (7) | 0.0102 (7) | 0.0037 (7) |
C18 | 0.0212 (9) | 0.0256 (10) | 0.0227 (9) | 0.0069 (8) | 0.0110 (8) | 0.0032 (8) |
C19 | 0.0279 (10) | 0.0301 (10) | 0.0280 (10) | 0.0118 (8) | 0.0189 (9) | 0.0085 (8) |
C20 | 0.0364 (11) | 0.0310 (11) | 0.0209 (9) | 0.0161 (9) | 0.0152 (9) | 0.0036 (8) |
C21 | 0.0316 (11) | 0.0297 (11) | 0.0224 (10) | 0.0047 (9) | 0.0101 (9) | −0.0031 (8) |
C22 | 0.0249 (10) | 0.0260 (10) | 0.0252 (10) | 0.0054 (8) | 0.0125 (8) | 0.0031 (8) |
C23 | 0.0161 (8) | 0.0206 (9) | 0.0256 (9) | 0.0056 (7) | 0.0106 (7) | 0.0022 (7) |
C24 | 0.0260 (10) | 0.0243 (10) | 0.0256 (10) | 0.0096 (8) | 0.0137 (8) | 0.0059 (8) |
C25 | 0.0375 (11) | 0.0295 (11) | 0.0309 (11) | 0.0131 (9) | 0.0201 (9) | 0.0014 (9) |
C26 | 0.0394 (12) | 0.0265 (11) | 0.0409 (12) | 0.0191 (9) | 0.0222 (10) | 0.0057 (9) |
C27 | 0.0426 (12) | 0.0340 (12) | 0.0328 (11) | 0.0235 (10) | 0.0181 (10) | 0.0130 (9) |
C28 | 0.0298 (10) | 0.0314 (11) | 0.0247 (10) | 0.0153 (9) | 0.0135 (9) | 0.0061 (8) |
C29 | 0.0201 (9) | 0.0192 (9) | 0.0229 (9) | 0.0057 (7) | 0.0088 (8) | 0.0027 (7) |
C30 | 0.0216 (9) | 0.0239 (10) | 0.0313 (11) | 0.0069 (8) | 0.0115 (8) | 0.0014 (8) |
C31 | 0.0202 (10) | 0.0261 (10) | 0.0371 (12) | 0.0051 (8) | 0.0052 (9) | 0.0020 (9) |
C32 | 0.0346 (12) | 0.0313 (12) | 0.0289 (11) | 0.0108 (9) | −0.0008 (9) | −0.0046 (9) |
C33 | 0.0420 (13) | 0.0459 (14) | 0.0286 (11) | 0.0206 (11) | 0.0106 (10) | −0.0062 (10) |
C34 | 0.0280 (10) | 0.0387 (12) | 0.0284 (11) | 0.0161 (9) | 0.0117 (9) | 0.0016 (9) |
C35 | 0.0229 (9) | 0.0225 (9) | 0.0261 (9) | 0.0127 (7) | 0.0152 (8) | 0.0071 (7) |
C36 | 0.0272 (10) | 0.0320 (11) | 0.0274 (10) | 0.0147 (9) | 0.0114 (9) | 0.0074 (8) |
C37 | 0.0454 (13) | 0.0540 (15) | 0.0277 (11) | 0.0342 (12) | 0.0185 (10) | 0.0166 (10) |
C38 | 0.0603 (16) | 0.0481 (14) | 0.0478 (14) | 0.0406 (13) | 0.0405 (13) | 0.0326 (12) |
C39 | 0.0465 (13) | 0.0265 (11) | 0.0590 (15) | 0.0204 (10) | 0.0389 (12) | 0.0219 (10) |
C40 | 0.0298 (10) | 0.0218 (9) | 0.0348 (11) | 0.0109 (8) | 0.0199 (9) | 0.0061 (8) |
Pd—C1 | 1.9985 (18) | C18—C19 | 1.385 (3) |
Pd—P2 | 2.3232 (5) | C18—H18 | 0.9500 |
Pd—P1 | 2.3393 (5) | C19—C20 | 1.385 (3) |
Pd—Br | 2.5353 (3) | C19—H19 | 0.9500 |
P1—C5 | 1.8248 (18) | C20—C21 | 1.381 (3) |
P1—C17 | 1.8255 (18) | C20—H20 | 0.9500 |
P1—C11 | 1.8267 (18) | C21—C22 | 1.390 (3) |
P2—C35 | 1.8188 (19) | C21—H21 | 0.9500 |
P2—C29 | 1.8247 (19) | C22—H22 | 0.9500 |
P2—C23 | 1.8363 (19) | C23—C28 | 1.393 (3) |
N1—C1 | 1.330 (2) | C23—C24 | 1.397 (3) |
N1—C2 | 1.337 (3) | C24—C25 | 1.386 (3) |
N2—C1 | 1.332 (2) | C24—H24 | 0.9500 |
N2—C4 | 1.340 (3) | C25—C26 | 1.377 (3) |
C2—C3 | 1.373 (3) | C25—H25 | 0.9500 |
C2—H2 | 0.9500 | C26—C27 | 1.380 (3) |
C3—C4 | 1.373 (3) | C26—H26 | 0.9500 |
C3—H3 | 0.9500 | C27—C28 | 1.388 (3) |
C4—H4 | 0.9500 | C27—H27 | 0.9500 |
C5—C10 | 1.391 (3) | C28—H28 | 0.9500 |
C5—C6 | 1.394 (3) | C29—C34 | 1.390 (3) |
C6—C7 | 1.385 (3) | C29—C30 | 1.397 (3) |
C6—H6 | 0.9500 | C30—C31 | 1.387 (3) |
C7—C8 | 1.384 (3) | C30—H30 | 0.9500 |
C7—H7 | 0.9500 | C31—C32 | 1.378 (3) |
C8—C9 | 1.382 (3) | C31—H31 | 0.9500 |
C8—H8 | 0.9500 | C32—C33 | 1.383 (3) |
C9—C10 | 1.386 (3) | C32—H32 | 0.9500 |
C9—H9 | 0.9500 | C33—C34 | 1.385 (3) |
C10—H10 | 0.9500 | C33—H33 | 0.9500 |
C11—C16 | 1.389 (3) | C34—H34 | 0.9500 |
C11—C12 | 1.398 (2) | C35—C40 | 1.389 (3) |
C12—C13 | 1.386 (3) | C35—C36 | 1.400 (3) |
C12—H12 | 0.9500 | C36—C37 | 1.384 (3) |
C13—C14 | 1.386 (3) | C36—H36 | 0.9500 |
C13—H13 | 0.9500 | C37—C38 | 1.382 (4) |
C14—C15 | 1.379 (3) | C37—H37 | 0.9500 |
C14—H14 | 0.9500 | C38—C39 | 1.378 (4) |
C15—C16 | 1.389 (3) | C38—H38 | 0.9500 |
C15—H15 | 0.9500 | C39—C40 | 1.391 (3) |
C16—H16 | 0.9500 | C39—H39 | 0.9500 |
C17—C22 | 1.389 (3) | C40—H40 | 0.9500 |
C17—C18 | 1.400 (2) | ||
C1—Pd—P2 | 86.86 (5) | C18—C17—P1 | 120.85 (14) |
C1—Pd—P1 | 90.58 (5) | C19—C18—C17 | 120.29 (18) |
P2—Pd—P1 | 176.743 (17) | C19—C18—H18 | 119.9 |
C1—Pd—Br | 176.56 (5) | C17—C18—H18 | 119.9 |
P2—Pd—Br | 89.758 (13) | C20—C19—C18 | 119.93 (18) |
P1—Pd—Br | 92.815 (13) | C20—C19—H19 | 120.0 |
C5—P1—C17 | 102.50 (8) | C18—C19—H19 | 120.0 |
C5—P1—C11 | 103.18 (8) | C21—C20—C19 | 120.22 (18) |
C17—P1—C11 | 103.89 (8) | C21—C20—H20 | 119.9 |
C5—P1—Pd | 117.16 (6) | C19—C20—H20 | 119.9 |
C17—P1—Pd | 112.70 (6) | C20—C21—C22 | 120.16 (19) |
C11—P1—Pd | 115.70 (6) | C20—C21—H21 | 119.9 |
C35—P2—C29 | 106.74 (9) | C22—C21—H21 | 119.9 |
C35—P2—C23 | 103.18 (8) | C17—C22—C21 | 120.16 (18) |
C29—P2—C23 | 102.10 (8) | C17—C22—H22 | 119.9 |
C35—P2—Pd | 110.52 (6) | C21—C22—H22 | 119.9 |
C29—P2—Pd | 113.50 (6) | C28—C23—C24 | 118.21 (17) |
C23—P2—Pd | 119.58 (6) | C28—C23—P2 | 118.41 (14) |
C1—N1—C2 | 115.99 (18) | C24—C23—P2 | 123.35 (14) |
C1—N2—C4 | 116.48 (17) | C25—C24—C23 | 120.97 (18) |
N1—C1—N2 | 125.98 (17) | C25—C24—H24 | 119.5 |
N1—C1—Pd | 116.27 (13) | C23—C24—H24 | 119.5 |
N2—C1—Pd | 117.66 (14) | C26—C25—C24 | 119.89 (19) |
N1—C2—C3 | 122.9 (2) | C26—C25—H25 | 120.1 |
N1—C2—H2 | 118.6 | C24—C25—H25 | 120.1 |
C3—C2—H2 | 118.6 | C25—C26—C27 | 120.13 (19) |
C2—C3—C4 | 116.5 (2) | C25—C26—H26 | 119.9 |
C2—C3—H3 | 121.7 | C27—C26—H26 | 119.9 |
C4—C3—H3 | 121.7 | C26—C27—C28 | 120.1 (2) |
N2—C4—C3 | 122.2 (2) | C26—C27—H27 | 119.9 |
N2—C4—H4 | 118.9 | C28—C27—H27 | 119.9 |
C3—C4—H4 | 118.9 | C27—C28—C23 | 120.64 (19) |
C10—C5—C6 | 119.00 (17) | C27—C28—H28 | 119.7 |
C10—C5—P1 | 122.17 (14) | C23—C28—H28 | 119.7 |
C6—C5—P1 | 118.80 (14) | C34—C29—C30 | 119.03 (18) |
C7—C6—C5 | 120.63 (19) | C34—C29—P2 | 120.58 (15) |
C7—C6—H6 | 119.7 | C30—C29—P2 | 120.39 (14) |
C5—C6—H6 | 119.7 | C31—C30—C29 | 120.22 (19) |
C8—C7—C6 | 119.70 (19) | C31—C30—H30 | 119.9 |
C8—C7—H7 | 120.2 | C29—C30—H30 | 119.9 |
C6—C7—H7 | 120.2 | C32—C31—C30 | 120.2 (2) |
C9—C8—C7 | 120.28 (19) | C32—C31—H31 | 119.9 |
C9—C8—H8 | 119.9 | C30—C31—H31 | 119.9 |
C7—C8—H8 | 119.9 | C31—C32—C33 | 120.0 (2) |
C8—C9—C10 | 120.07 (19) | C31—C32—H32 | 120.0 |
C8—C9—H9 | 120.0 | C33—C32—H32 | 120.0 |
C10—C9—H9 | 120.0 | C32—C33—C34 | 120.3 (2) |
C9—C10—C5 | 120.32 (18) | C32—C33—H33 | 119.9 |
C9—C10—H10 | 119.8 | C34—C33—H33 | 119.9 |
C5—C10—H10 | 119.8 | C33—C34—C29 | 120.29 (19) |
C16—C11—C12 | 118.97 (17) | C33—C34—H34 | 119.9 |
C16—C11—P1 | 119.85 (14) | C29—C34—H34 | 119.9 |
C12—C11—P1 | 121.13 (14) | C40—C35—C36 | 118.88 (18) |
C13—C12—C11 | 120.14 (18) | C40—C35—P2 | 123.01 (15) |
C13—C12—H12 | 119.9 | C36—C35—P2 | 118.08 (15) |
C11—C12—H12 | 119.9 | C37—C36—C35 | 120.3 (2) |
C12—C13—C14 | 120.48 (18) | C37—C36—H36 | 119.8 |
C12—C13—H13 | 119.8 | C35—C36—H36 | 119.8 |
C14—C13—H13 | 119.8 | C38—C37—C36 | 120.3 (2) |
C15—C14—C13 | 119.52 (18) | C38—C37—H37 | 119.9 |
C15—C14—H14 | 120.2 | C36—C37—H37 | 119.9 |
C13—C14—H14 | 120.2 | C39—C38—C37 | 119.7 (2) |
C14—C15—C16 | 120.50 (19) | C39—C38—H38 | 120.1 |
C14—C15—H15 | 119.8 | C37—C38—H38 | 120.1 |
C16—C15—H15 | 119.8 | C38—C39—C40 | 120.6 (2) |
C11—C16—C15 | 120.38 (18) | C38—C39—H39 | 119.7 |
C11—C16—H16 | 119.8 | C40—C39—H39 | 119.7 |
C15—C16—H16 | 119.8 | C35—C40—C39 | 120.1 (2) |
C22—C17—C18 | 119.23 (17) | C35—C40—H40 | 120.0 |
C22—C17—P1 | 119.88 (14) | C39—C40—H40 | 120.0 |
Experimental details
Crystal data | |
Chemical formula | [PdBr(C4H3N2)(C18H15P)2] |
Mr | 789.93 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 150 |
a, b, c (Å) | 12.1051 (8), 12.7791 (8), 12.8987 (8) |
α, β, γ (°) | 90.257 (2), 117.044 (2), 105.580 (2) |
V (Å3) | 1693.11 (19) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 1.86 |
Crystal size (mm) | 0.50 × 0.35 × 0.25 |
Data collection | |
Diffractometer | Bruker SMART APEX CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2001) |
Tmin, Tmax | 0.457, 0.654 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 22016, 7762, 7066 |
Rint | 0.023 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.023, 0.058, 1.02 |
No. of reflections | 7762 |
No. of parameters | 415 |
No. of restraints | 2 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.40, −0.40 |
Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
Acknowledgements
We thank the National Science Council of the Republic of China for financial support (NSC98–2113-M-241–011-MY2).
References
Beeby, A., Bettington, S., Fairlamb, I. J. S., Goeta, A. E., Kapdi, A. R., Niemela, E. H. & Thompson, A. L. (2004). New J. Chem. 28, 600–605. Web of Science CSD CrossRef CAS Google Scholar
Bruker (2001). SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Bruker (2007). SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Cardin, D. J., Cetinkaya, B. & Lappert, M. F. (1972). Chem. Rev. 72, 545–574. CrossRef CAS Web of Science Google Scholar
Chin, C. H., Yeo, S. L., Loh, Z. H., Vittal, J. J., Henderson, W. & Hor, T. S. A. (1988). J. Chem. Soc. Dalton Trans. pp. 3777–3784. Google Scholar
Dobrzynski, E. D. & Angelici, R. J. (1975). Inorg. Chem. 14, 1513–1518. CrossRef CAS Web of Science Google Scholar
Hong, F. U., Huang, Y. L., Chen, P. P. & Chang, Y. C. (2002). J. Organomet. Chem. 655, 49–54. Web of Science CSD CrossRef CAS Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Steffen, A., Sladek, M. I., Braun, T., Neumann, B. & Stammler, H. G. (2005). Organometallics, 24, 4057–4064. Web of Science CSD CrossRef CAS Google Scholar
Yih, K. H. & Lee, G. H. (2008). J. Chin. Chem. Soc. 55, 109–114. CAS Google Scholar
Yih, K. H., Wang, H. F., Huang, K. F., Kwan, C. C. & Lee, G. H. (2009). J. Chin. Chem. Soc. 56, 718–724. CAS Google Scholar
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C—C coupling reactions of pyrimidinyl nickel complexes (Steffen et al., 2005), Suzuki cross-coupling reactions of pyridyl-bridged palladium complex (Beeby, et al., 2004), and intramolecular reductive elimination of Pd—N binuclear complex [Pd(µ-C9H6N)(µ-dppm)]2(Cl)2 (Chin et al., 1988) are some of important reactions in organic synthesis by forming C—C bond (Dobrzynski & Angelici, 1975). To our knowledge, no 2-palladiumpyrimidine crystal structure has been described.
To synthesis of 2-palladiumpyrimidine compound, complex [Pd(PPh3)4] was used to react with 2-bromopyrimidine in dichloromethane at room temperature. As a result, a two triphenylphosphine displaced complex [Pd(Br)(C4H3N2)(PPh3)2] was isolated with 95% yield. The X-ray crystal structure analysis has been carried out to provide structural parameters.
The molecular structure of the title compound is shown in Fig. 1. In the title complex (I), the palladium atom has a distorted square planar geometry. The palladium atom is displaced by 0.0150 (5)Å from the least-squares plane of BrP1P2C1. The Pd—C1 bond distance, 1.9985 (18) Å, is longer than other PdII-carbon(carbonyl) distances, and similar to those of Pd—C(carbene) distances (Cardin et al., 1972, and references therein). Two PPh3 ligands are in trans position: P1—Pd—P2, 176.743 (17)°, while the pyrimidinyl ligand and bromide are trans to each other: C1—Pd—Br1, 176.56 (5)°. The Pd—N bond distances (2.8489 (17) and 2.8703 (16) Å) indicate no bonding interaction between the nitrogen atom and palladium metal atom. Within the pyrimidinyl ligand itself, the geometry is consistent with a significant partial double bond character in the C—C and C—N bond. The C—N bond distances (1.330 (2) ~1.340 (3) Å) are typical for a C—N bond having partial double bond character and are certainly much shorter than the normal C—N (1.47 Å) single bond. The Pd—C1 (1.9985 (18) Å) and Pd—Br (2.5353 (3) Å) lengths of (I) are in agreement with reported value (Yih et al., 2008, 2009).
The 31P{1H} NMR spectra of (I) shows a singlet resonances at δ 21.4. In the 1H NMR spectra, the 4-H and 5-H protons of the pyrimidinyl group exhibit two singlet resonances at δ 7.86 and at δ 7.52. The 13C{1H} NMR spectra of (I) reveals two singlet at δ 114.2 and at δ 154.4 which are assigned to the 5-C and 4-C carbon atom of the pyrimidinyl group. It is also noted the IR spectrum of the title complex (I) shows two stretching bands at 1546 and 1537 cm-1 for C═N groups. In the FAB mass spectra, base peak with the typical Pd isotope distribution is in agreement with the [M+] molecular mass of (I).