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Acta Crystallogr Sect E Struct Rep Online. 2009 July 1; 65(Pt 7): m727.
Published online 2009 June 6. doi:  10.1107/S1600536809020583
PMCID: PMC2969277

[(2,3,5,6-η)-Bicyclo­[2.2.1]hepta-2,5-diene]dibromidopalladium(II)

Abstract

In the title complex, [PdBr2(C7H8)], the PdII ion lies in a distorted square-planar environment defined by the two Br atoms and the mid-points of the two π-coordinated double bonds of bicyclo­[2.2.1]hepta-2,5-diene. The complex is disposed about a crystallographic mirror plane parallel to the ac plane passing through the Pd, Br atoms and the centre of the diene ligand.

Related literature

For the preparation of [PdX 2(nbd)] (X = Cl or Br; nbd = (norbornadiene), see: Alexander et al. (1960 [triangle]). For the crystal structure of [PdCl2(nbd)], see: Baenziger et al. (1965 [triangle]). For the gas electron diffraction structure of norbornadiene, see: Yokozeki & Kuchitsu (1971 [triangle]).

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Object name is e-65-0m727-scheme1.jpg

Experimental

Crystal data

  • [PdBr2(C7H8)]
  • M r = 358.35
  • Orthorhombic, An external file that holds a picture, illustration, etc.
Object name is e-65-0m727-efi2.jpg
  • a = 12.758 (2) Å
  • b = 7.4313 (11) Å
  • c = 9.0138 (14) Å
  • V = 854.6 (2) Å3
  • Z = 4
  • Mo Kα radiation
  • μ = 11.44 mm−1
  • T = 296 K
  • 0.22 × 0.20 × 0.15 mm

Data collection

  • Bruker SMART 1000 CCD diffractometer
  • Absorption correction: multi-scan (SADABS; Bruker, 2000 [triangle]) T min = 0.126, T max = 0.180
  • 5210 measured reflections
  • 944 independent reflections
  • 673 reflections with I > 2σ(I)
  • R int = 0.042

Refinement

  • R[F 2 > 2σ(F 2)] = 0.026
  • wR(F 2) = 0.071
  • S = 0.99
  • 944 reflections
  • 52 parameters
  • H-atom parameters constrained
  • Δρmax = 1.10 e Å−3
  • Δρmin = −1.79 e Å−3

Data collection: SMART (Bruker, 2000 [triangle]); cell refinement: SAINT (Bruker, 2000 [triangle]); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 [triangle]); molecular graphics: PLATON (Spek, 2009 [triangle]); software used to prepare material for publication: SHELXL97.

Supplementary Material

Crystal structure: contains datablocks I. DOI: 10.1107/S1600536809020583/ez2172sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536809020583/ez2172Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Acknowledgments

This work was supported by a Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2007–412-J02001).

supplementary crystallographic information

Comment

The title complex, [PdBr2(C7H8)], is isomorphous with the analogous Pd(II) complex [PdCl2(C7H8)] (Baenziger et al., 1965). In the complex, the central PdII ion is essentially in a square-planar environment defined by the two Br atoms and the two midpoints (M1, M2) of the π-coordinated double bonds of the bicyclo[2.2.1]hepta-2,5-diene (norbornadiene; nbd) ligand [M1 and M2 denote the midpoints of the olefinic bonds C1—C1a and C2—C2a, respectively; symmetry code: (a) x, 1/2 - y, z] (Fig. 1). The complex is disposed about a crystallographic mirror plane parallel to the ac plane passing through the Pd atom, the Br atoms and the centre of the ligand with the special positions (x, 1/4, z) (Fig. 2). The pairs of Pd—Br and Pd—C bond lengths are almost equal (Pd—Br: 2.4258 (11) and 2.4294 (10) Å; Pd—C: 2.165 (5) and 2.170 (5) Å). The nbd ligand coordinates symmetrically to the Pd atom, and displays a slight increase in the double-bond distances (1.389 (10) and 1.388 (10) Å) compared with the non-coordinating double bonds of nbd in the gas phase (1.343 (3) Å; Yokozeki & Kuchitsu, 1971).

Experimental

To a solution of (bicyclo[2.2.1]hepta-2,5-diene)dichloridopalladium(II) (0.200 g, 0.742 mmol) in EtOH (20 ml) was added NaBr (0.816 g, 7.931 mmol), and refluxed for 1 h. The formed precipitate was separated by filtration and washed with EtOH and water and dried under vacuum, to give an orange powder (0.053 g). Crystals suitable for X-ray analysis were obtained by slow evaporation from a CH3CN solution.

Refinement

H atoms were positioned geometrically and allowed to ride on their respective parent atoms [C—H = 0.98 (CH) or 0.97 Å (CH2) and Uiso(H) = 1.2Ueq(C)].

Figures

Fig. 1.
The structure of the title complex, with displacement ellipsoids drawn at the 40% probability level for non-H atoms [Symmetry code: (a) x, 1/2 - y, z].
Fig. 2.
View of the unit-cell contents of the title complex.

Crystal data

[PdBr2(C7H8)]F(000) = 664
Mr = 358.35Dx = 2.785 Mg m3
Orthorhombic, PnmaMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ac 2nCell parameters from 2031 reflections
a = 12.758 (2) Åθ = 2.7–27.9°
b = 7.4313 (11) ŵ = 11.44 mm1
c = 9.0138 (14) ÅT = 296 K
V = 854.6 (2) Å3Block, orange
Z = 40.22 × 0.20 × 0.15 mm

Data collection

Bruker SMART 1000 CCD diffractometer944 independent reflections
Radiation source: fine-focus sealed tube673 reflections with I > 2σ(I)
graphiteRint = 0.042
[var phi] and ω scansθmax = 26.4°, θmin = 2.8°
Absorption correction: multi-scan (SADABS; Bruker, 2000)h = −14→15
Tmin = 0.126, Tmax = 0.180k = −8→9
5210 measured reflectionsl = −11→6

Refinement

Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.026Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.071H-atom parameters constrained
S = 0.99w = 1/[σ2(Fo2) + (0.0331P)2] where P = (Fo2 + 2Fc2)/3
944 reflections(Δ/σ)max < 0.001
52 parametersΔρmax = 1.10 e Å3
0 restraintsΔρmin = −1.79 e Å3

Special details

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2)

xyzUiso*/Ueq
Pd10.06852 (4)0.25000.92135 (7)0.0312 (2)
Br10.19165 (7)0.25001.12643 (11)0.0462 (3)
Br2−0.08564 (6)0.25001.07957 (11)0.0491 (3)
C10.1765 (4)0.1566 (7)0.7528 (6)0.0363 (14)
H10.23880.08440.77520.044*
C2−0.0067 (4)0.1566 (7)0.7196 (6)0.0380 (14)
H2−0.07090.08440.71920.046*
C30.0934 (4)0.0997 (8)0.6402 (7)0.0419 (15)
H30.0967−0.02410.60310.050*
C40.1048 (6)0.25000.5270 (11)0.052 (2)
H4A0.17270.25000.47860.063*
H4B0.04920.25000.45360.063*

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
Pd10.0263 (3)0.0349 (4)0.0325 (4)0.0000.0009 (3)0.000
Br10.0491 (5)0.0448 (5)0.0448 (6)0.000−0.0147 (4)0.000
Br20.0430 (5)0.0488 (6)0.0556 (7)0.0000.0181 (4)0.000
C10.025 (2)0.046 (3)0.038 (4)0.007 (2)0.006 (2)−0.005 (3)
C20.032 (3)0.048 (3)0.034 (3)−0.006 (2)−0.007 (3)−0.002 (3)
C30.043 (3)0.040 (3)0.042 (4)0.003 (3)0.002 (3)−0.013 (3)
C40.043 (5)0.073 (7)0.040 (6)0.0000.005 (4)0.000

Geometric parameters (Å, °)

Pd1—C1i2.165 (5)C2—C2i1.388 (10)
Pd1—C12.165 (5)C2—C31.523 (7)
Pd1—C2i2.170 (5)C2—H20.9800
Pd1—C22.170 (5)C3—C41.520 (9)
Pd1—Br12.4258 (11)C3—H30.9800
Pd1—Br22.4294 (10)C4—C3i1.520 (9)
C1—C1i1.389 (10)C4—H4A0.9700
C1—C31.527 (7)C4—H4B0.9700
C1—H10.9800
C1i—Pd1—C137.4 (3)Pd1—C1—H1123.2
C1i—Pd1—C2i65.8 (2)C2i—C2—C3106.1 (3)
C1—Pd1—C2i78.2 (2)C2i—C2—Pd171.35 (14)
C1i—Pd1—C278.2 (2)C3—C2—Pd196.4 (3)
C1—Pd1—C265.8 (2)C2i—C2—H2123.2
C2i—Pd1—C237.3 (3)C3—C2—H2123.2
C1i—Pd1—Br197.05 (14)Pd1—C2—H2123.2
C1—Pd1—Br197.05 (14)C4—C3—C2101.0 (5)
C2i—Pd1—Br1157.65 (14)C4—C3—C1100.2 (5)
C2—Pd1—Br1157.65 (14)C2—C3—C1101.1 (4)
C1i—Pd1—Br2157.97 (13)C4—C3—H3117.2
C1—Pd1—Br2157.97 (13)C2—C3—H3117.2
C2i—Pd1—Br297.71 (14)C1—C3—H3117.2
C2—Pd1—Br297.71 (14)C3i—C4—C394.6 (7)
Br1—Pd1—Br294.41 (4)C3i—C4—H4A112.8
C1i—C1—C3106.1 (3)C3—C4—H4A112.8
C1i—C1—Pd171.29 (13)C3i—C4—H4B112.8
C3—C1—Pd196.5 (3)C3—C4—H4B112.8
C1i—C1—H1123.2H4A—C4—H4B110.3
C3—C1—H1123.2
C2i—Pd1—C1—C1i65.45 (15)C2i—Pd1—C2—C3104.9 (3)
C2—Pd1—C1—C1i102.59 (16)Br1—Pd1—C2—C3−40.3 (6)
Br2—Pd1—C1—C1i146.8 (4)Br2—Pd1—C2—C3−162.5 (3)
C1i—Pd1—C1—C3−104.8 (3)C2i—C2—C3—C4−33.3 (5)
C2i—Pd1—C1—C3−39.3 (3)Pd1—C2—C3—C4−105.7 (4)
C2—Pd1—C1—C3−2.2 (3)C2i—C2—C3—C169.5 (4)
Br1—Pd1—C1—C3162.8 (3)Pd1—C2—C3—C1−2.9 (4)
Br2—Pd1—C1—C342.0 (6)C1i—C1—C3—C434.0 (4)
C1i—Pd1—C2—C2i−65.40 (15)Pd1—C1—C3—C4106.4 (4)
C1—Pd1—C2—C2i−102.69 (16)C1i—C1—C3—C2−69.5 (4)
Br1—Pd1—C2—C2i−145.2 (4)Pd1—C1—C3—C22.9 (4)
C1i—Pd1—C2—C339.5 (3)C2—C3—C4—C3i51.1 (6)
C1—Pd1—C2—C32.2 (3)C1—C3—C4—C3i−52.5 (6)

Symmetry codes: (i) x, −y+1/2, z.

Footnotes

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: EZ2172).

References

  • Alexander, R. A., Baenziger, N. C., Carpenter, C. & Doyle, J. R. (1960). J. Am. Chem. Soc 82, 535–538.
  • Baenziger, N. C., Richards, G. F. & Doyle, J. R. (1965). Acta Cryst.18, 924–926.
  • Bruker (2000). SADABS, SMART and SAINT Bruker AXS Inc., Madison, Wisconsin, USA.
  • Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. [PubMed]
  • Spek, A. L. (2009). Acta Cryst. D65, 148–155. [PMC free article] [PubMed]
  • Yokozeki, A. & Kuchitsu, K. (1971). Bull. Chem. Soc. Jpn, 44, 2356–2363.

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