metal-organic compounds
Dichlorido(2,3-di-2-pyridylpyrazine-κ2N1,N2)palladium(II)
aSchool of Applied Chemical Engineering, The Research Institute of Catalysis, Chonnam National University, Gwangju 500-757, Republic of Korea
*Correspondence e-mail: hakwang@chonnam.ac.kr
The PdII ion in the title complex, [PdCl2(C14H10N4)], is four-coordinated in a distorted square-planar environment defined by two N atoms of a chelating 2,3-di-2-pyridylpyrazine (dpp) ligand and two chloride anions. The pyridine ring coordinated to the Pd atom is inclined slightly to its carrier pyrazine ring [dihedral angle = 14.4 (3)°], whereas the uncoordinated pyridine ring is inclined considerably to the pyrazine ring [dihedral angle = 52.2 (2)°]. The dihedral angle between the two pyridine rings is 58.8 (2)°. In the crystal, complex molecules are connected by intermolecular C—H⋯Cl and C—H⋯N hydrogen bonds, forming a three-dimensional network. Intramolecular C—H⋯Cl hydrogen bonds are also present.
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2000); cell SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S1600536811044369/tk5006sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811044369/tk5006Isup2.hkl
The single crystals of the title complex were obtained as a by-product from the reaction of Na2PdCl4 (0.2960 g, 1.006 mmol) with 2,3-di-2-pyridylpyrazine (0.2361 g, 1.008 mmol) in MeOH (30 ml). After stirring of the reaction mixture for 20 h at room temperature, the formed precipitate was separated by filtration, washed with MeOH, and dried at 50 °C, to give a yellow powder (0.3560 g). Orange crystals suitable for X-ray analysis were obtained by slow evaporation from an acetone/CH3NO2 solution of the yellow product.
H atoms were positioned geometrically and allowed to ride on their respective parent atoms [C—H = 0.95 Å and Uiso(H) = 1.2Ueq(C)]. The highest peak (1.18 e Å-3) and the deepest hole (-2.09 e Å-3) in the final difference Fourier map are located 0.74 Å and 0.88 Å from the N1 and Pd1 atoms, respectively.
Data collection: SMART (Bruker, 2000); cell
SAINT (Bruker, 2000); data reduction: SAINT (Bruker, 2000); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).[PdCl2(C14H10N4)] | Z = 2 |
Mr = 411.56 | F(000) = 404 |
Triclinic, P1 | Dx = 1.928 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.1681 (10) Å | Cell parameters from 2636 reflections |
b = 9.5480 (11) Å | θ = 2.8–28.2° |
c = 10.1137 (12) Å | µ = 1.68 mm−1 |
α = 84.543 (2)° | T = 200 K |
β = 71.400 (2)° | Block, orange |
γ = 71.475 (2)° | 0.26 × 0.16 × 0.12 mm |
V = 708.81 (15) Å3 |
Bruker SMART 1000 CCD diffractometer | 3406 independent reflections |
Radiation source: fine-focus sealed tube | 2608 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.025 |
ϕ and ω scans | θmax = 28.3°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | h = −10→10 |
Tmin = 0.748, Tmax = 1.000 | k = −12→11 |
5225 measured reflections | l = −12→13 |
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)] = 0.046 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.115 | H-atom parameters constrained |
S = 1.24 | w = 1/[σ2(Fo2) + (0.P)2 + 3.5422P] where P = (Fo2 + 2Fc2)/3 |
3406 reflections | (Δ/σ)max < 0.001 |
190 parameters | Δρmax = 1.18 e Å−3 |
0 restraints | Δρmin = −2.09 e Å−3 |
[PdCl2(C14H10N4)] | γ = 71.475 (2)° |
Mr = 411.56 | V = 708.81 (15) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.1681 (10) Å | Mo Kα radiation |
b = 9.5480 (11) Å | µ = 1.68 mm−1 |
c = 10.1137 (12) Å | T = 200 K |
α = 84.543 (2)° | 0.26 × 0.16 × 0.12 mm |
β = 71.400 (2)° |
Bruker SMART 1000 CCD diffractometer | 3406 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | 2608 reflections with I > 2σ(I) |
Tmin = 0.748, Tmax = 1.000 | Rint = 0.025 |
5225 measured reflections |
R[F2 > 2σ(F2)] = 0.046 | 0 restraints |
wR(F2) = 0.115 | H-atom parameters constrained |
S = 1.24 | Δρmax = 1.18 e Å−3 |
3406 reflections | Δρmin = −2.09 e Å−3 |
190 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 | ||
Pd1 | 0.71773 (7) | 0.48277 (5) | −0.10860 (5) | 0.02952 (14) | |
Cl1 | 0.6858 (3) | 0.43540 (19) | −0.31486 (17) | 0.0416 (4) | |
Cl2 | 0.6748 (2) | 0.72437 (18) | −0.17098 (19) | 0.0416 (4) | |
N1 | 0.7538 (6) | 0.2716 (5) | −0.0374 (5) | 0.0241 (10) | |
N2 | 0.7697 (8) | 0.0024 (6) | 0.0868 (6) | 0.0384 (13) | |
N3 | 0.7611 (6) | 0.5057 (5) | 0.0743 (5) | 0.0249 (10) | |
N4 | 0.8648 (8) | −0.0406 (6) | 0.3339 (6) | 0.0398 (14) | |
C1 | 0.7696 (8) | 0.2515 (7) | 0.0931 (6) | 0.0305 (14) | |
C2 | 0.7656 (9) | 0.1158 (7) | 0.1572 (7) | 0.0313 (14) | |
C3 | 0.7645 (11) | 0.0272 (8) | −0.0442 (7) | 0.0450 (18) | |
H3 | 0.7708 | −0.0524 | −0.0972 | 0.054* | |
C4 | 0.7504 (9) | 0.1629 (7) | −0.1050 (7) | 0.0349 (15) | |
H4 | 0.7381 | 0.1782 | −0.1960 | 0.042* | |
C5 | 0.7923 (7) | 0.3781 (6) | 0.1508 (6) | 0.0228 (12) | |
C6 | 0.8494 (9) | 0.3771 (7) | 0.2643 (7) | 0.0362 (15) | |
H6 | 0.8776 | 0.2883 | 0.3149 | 0.043* | |
C7 | 0.8667 (9) | 0.5053 (8) | 0.3064 (7) | 0.0368 (15) | |
H7 | 0.9028 | 0.5056 | 0.3868 | 0.044* | |
C8 | 0.8305 (9) | 0.6301 (8) | 0.2296 (7) | 0.0381 (16) | |
H8 | 0.8414 | 0.7189 | 0.2558 | 0.046* | |
C9 | 0.7787 (8) | 0.6264 (6) | 0.1150 (7) | 0.0288 (13) | |
H9 | 0.7541 | 0.7140 | 0.0621 | 0.035* | |
C10 | 0.7479 (8) | 0.0837 (7) | 0.3079 (6) | 0.0290 (13) | |
C11 | 0.6105 (9) | 0.1744 (7) | 0.4115 (7) | 0.0362 (15) | |
H11 | 0.5300 | 0.2628 | 0.3891 | 0.043* | |
C12 | 0.5941 (10) | 0.1325 (8) | 0.5488 (7) | 0.0434 (17) | |
H12 | 0.5014 | 0.1921 | 0.6228 | 0.052* | |
C13 | 0.7126 (11) | 0.0043 (8) | 0.5770 (7) | 0.0461 (19) | |
H13 | 0.7026 | −0.0273 | 0.6704 | 0.055* | |
C14 | 0.8465 (11) | −0.0774 (8) | 0.4673 (8) | 0.049 (2) | |
H14 | 0.9305 | −0.1649 | 0.4874 | 0.059* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Pd1 | 0.0345 (3) | 0.0262 (3) | 0.0292 (3) | −0.0109 (2) | −0.0108 (2) | 0.00380 (18) |
Cl1 | 0.0574 (11) | 0.0411 (9) | 0.0321 (9) | −0.0175 (8) | −0.0211 (8) | 0.0073 (7) |
Cl2 | 0.0506 (10) | 0.0293 (8) | 0.0514 (11) | −0.0165 (7) | −0.0235 (9) | 0.0126 (7) |
N1 | 0.024 (2) | 0.022 (2) | 0.024 (3) | −0.008 (2) | −0.006 (2) | 0.0076 (19) |
N2 | 0.057 (4) | 0.025 (3) | 0.036 (3) | −0.013 (3) | −0.019 (3) | 0.005 (2) |
N3 | 0.027 (3) | 0.022 (2) | 0.030 (3) | −0.010 (2) | −0.014 (2) | 0.009 (2) |
N4 | 0.055 (4) | 0.030 (3) | 0.036 (3) | −0.006 (3) | −0.022 (3) | 0.001 (2) |
C1 | 0.032 (3) | 0.036 (4) | 0.022 (3) | −0.008 (3) | −0.009 (3) | 0.000 (3) |
C2 | 0.037 (3) | 0.024 (3) | 0.030 (3) | −0.007 (3) | −0.008 (3) | −0.004 (2) |
C3 | 0.076 (5) | 0.032 (4) | 0.036 (4) | −0.020 (4) | −0.024 (4) | −0.006 (3) |
C4 | 0.059 (4) | 0.024 (3) | 0.028 (3) | −0.016 (3) | −0.016 (3) | −0.006 (2) |
C5 | 0.023 (3) | 0.023 (3) | 0.022 (3) | −0.005 (2) | −0.007 (2) | −0.004 (2) |
C6 | 0.040 (4) | 0.032 (3) | 0.039 (4) | −0.010 (3) | −0.017 (3) | 0.001 (3) |
C7 | 0.034 (3) | 0.053 (4) | 0.028 (3) | −0.019 (3) | −0.011 (3) | 0.000 (3) |
C8 | 0.042 (4) | 0.040 (4) | 0.032 (4) | −0.018 (3) | −0.004 (3) | −0.007 (3) |
C9 | 0.030 (3) | 0.020 (3) | 0.037 (4) | −0.009 (2) | −0.008 (3) | −0.002 (2) |
C10 | 0.037 (3) | 0.026 (3) | 0.029 (3) | −0.013 (3) | −0.013 (3) | 0.001 (2) |
C11 | 0.046 (4) | 0.032 (4) | 0.033 (4) | −0.014 (3) | −0.013 (3) | −0.002 (3) |
C12 | 0.058 (5) | 0.050 (4) | 0.027 (4) | −0.027 (4) | −0.008 (3) | 0.000 (3) |
C13 | 0.081 (6) | 0.044 (4) | 0.029 (4) | −0.035 (4) | −0.024 (4) | 0.009 (3) |
C14 | 0.075 (6) | 0.040 (4) | 0.055 (5) | −0.025 (4) | −0.046 (5) | 0.015 (4) |
Pd1—N3 | 2.035 (5) | C4—H4 | 0.9500 |
Pd1—N1 | 2.038 (5) | C5—C6 | 1.368 (8) |
Pd1—Cl2 | 2.2787 (17) | C6—C7 | 1.395 (9) |
Pd1—Cl1 | 2.2860 (17) | C6—H6 | 0.9500 |
N1—C4 | 1.308 (7) | C7—C8 | 1.363 (9) |
N1—C1 | 1.357 (7) | C7—H7 | 0.9500 |
N2—C3 | 1.336 (8) | C8—C9 | 1.362 (9) |
N2—C2 | 1.338 (8) | C8—H8 | 0.9500 |
N3—C9 | 1.323 (7) | C9—H9 | 0.9500 |
N3—C5 | 1.377 (7) | C10—C11 | 1.383 (9) |
N4—C10 | 1.331 (8) | C11—C12 | 1.385 (9) |
N4—C14 | 1.334 (9) | C11—H11 | 0.9500 |
C1—C2 | 1.398 (8) | C12—C13 | 1.368 (10) |
C1—C5 | 1.477 (8) | C12—H12 | 0.9500 |
C2—C10 | 1.495 (8) | C13—C14 | 1.373 (11) |
C3—C4 | 1.367 (9) | C13—H13 | 0.9500 |
C3—H3 | 0.9500 | C14—H14 | 0.9500 |
N3—Pd1—N1 | 80.24 (19) | N3—C5—C1 | 114.2 (5) |
N3—Pd1—Cl2 | 95.40 (14) | C5—C6—C7 | 120.6 (6) |
N1—Pd1—Cl2 | 175.50 (15) | C5—C6—H6 | 119.7 |
N3—Pd1—Cl1 | 174.80 (14) | C7—C6—H6 | 119.7 |
N1—Pd1—Cl1 | 95.27 (14) | C8—C7—C6 | 118.5 (6) |
Cl2—Pd1—Cl1 | 89.14 (6) | C8—C7—H7 | 120.8 |
C4—N1—C1 | 120.7 (5) | C6—C7—H7 | 120.8 |
C4—N1—Pd1 | 124.3 (4) | C9—C8—C7 | 119.4 (6) |
C1—N1—Pd1 | 114.8 (4) | C9—C8—H8 | 120.3 |
C3—N2—C2 | 117.3 (6) | C7—C8—H8 | 120.3 |
C9—N3—C5 | 119.8 (5) | N3—C9—C8 | 122.6 (6) |
C9—N3—Pd1 | 125.0 (4) | N3—C9—H9 | 118.7 |
C5—N3—Pd1 | 114.8 (4) | C8—C9—H9 | 118.7 |
C10—N4—C14 | 117.3 (6) | N4—C10—C11 | 123.3 (6) |
N1—C1—C2 | 117.9 (6) | N4—C10—C2 | 115.6 (5) |
N1—C1—C5 | 114.9 (5) | C11—C10—C2 | 121.0 (6) |
C2—C1—C5 | 127.2 (5) | C10—C11—C12 | 117.9 (7) |
N2—C2—C1 | 121.4 (6) | C10—C11—H11 | 121.0 |
N2—C2—C10 | 113.5 (5) | C12—C11—H11 | 121.0 |
C1—C2—C10 | 125.1 (5) | C13—C12—C11 | 119.4 (7) |
N2—C3—C4 | 122.5 (6) | C13—C12—H12 | 120.3 |
N2—C3—H3 | 118.8 | C11—C12—H12 | 120.3 |
C4—C3—H3 | 118.8 | C12—C13—C14 | 118.5 (7) |
N1—C4—C3 | 119.8 (6) | C12—C13—H13 | 120.7 |
N1—C4—H4 | 120.1 | C14—C13—H13 | 120.7 |
C3—C4—H4 | 120.1 | N4—C14—C13 | 123.5 (7) |
C6—C5—N3 | 118.9 (5) | N4—C14—H14 | 118.2 |
C6—C5—C1 | 126.8 (6) | C13—C14—H14 | 118.2 |
N3—Pd1—N1—C4 | −178.6 (5) | Pd1—N3—C5—C1 | −6.1 (6) |
Cl1—Pd1—N1—C4 | −1.2 (5) | N1—C1—C5—C6 | −164.9 (6) |
N3—Pd1—N1—C1 | 6.0 (4) | C2—C1—C5—C6 | 14.1 (10) |
Cl1—Pd1—N1—C1 | −176.7 (4) | N1—C1—C5—N3 | 11.2 (7) |
N1—Pd1—N3—C9 | 173.4 (5) | C2—C1—C5—N3 | −169.8 (6) |
Cl2—Pd1—N3—C9 | −7.8 (5) | N3—C5—C6—C7 | 3.4 (9) |
N1—Pd1—N3—C5 | 0.3 (4) | C1—C5—C6—C7 | 179.2 (6) |
Cl2—Pd1—N3—C5 | 179.2 (4) | C5—C6—C7—C8 | −1.9 (10) |
C4—N1—C1—C2 | −5.6 (9) | C6—C7—C8—C9 | 0.1 (10) |
Pd1—N1—C1—C2 | 170.0 (4) | C5—N3—C9—C8 | 1.3 (9) |
C4—N1—C1—C5 | 173.5 (5) | Pd1—N3—C9—C8 | −171.3 (5) |
Pd1—N1—C1—C5 | −10.9 (6) | C7—C8—C9—N3 | 0.1 (10) |
C3—N2—C2—C1 | −4.7 (10) | C14—N4—C10—C11 | −0.1 (10) |
C3—N2—C2—C10 | 172.6 (6) | C14—N4—C10—C2 | −176.2 (6) |
N1—C1—C2—N2 | 8.5 (9) | N2—C2—C10—N4 | 50.6 (8) |
C5—C1—C2—N2 | −170.5 (6) | C1—C2—C10—N4 | −132.3 (7) |
N1—C1—C2—C10 | −168.5 (6) | N2—C2—C10—C11 | −125.6 (7) |
C5—C1—C2—C10 | 12.5 (10) | C1—C2—C10—C11 | 51.5 (9) |
C2—N2—C3—C4 | −1.8 (11) | N4—C10—C11—C12 | −0.5 (10) |
C1—N1—C4—C3 | −0.6 (10) | C2—C10—C11—C12 | 175.4 (6) |
Pd1—N1—C4—C3 | −175.8 (5) | C10—C11—C12—C13 | 0.0 (10) |
N2—C3—C4—N1 | 4.6 (12) | C11—C12—C13—C14 | 1.0 (11) |
C9—N3—C5—C6 | −3.1 (8) | C10—N4—C14—C13 | 1.2 (11) |
Pd1—N3—C5—C6 | 170.3 (4) | C12—C13—C14—N4 | −1.7 (11) |
C9—N3—C5—C1 | −179.5 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···Cl2i | 0.95 | 2.73 | 3.632 (7) | 159 |
C4—H4···Cl1 | 0.95 | 2.60 | 3.216 (7) | 123 |
C8—H8···N4ii | 0.95 | 2.58 | 3.529 (9) | 178 |
C9—H9···Cl2 | 0.95 | 2.62 | 3.241 (7) | 123 |
C13—H13···Cl2iii | 0.95 | 2.76 | 3.530 (7) | 139 |
Symmetry codes: (i) x, y−1, z; (ii) x, y+1, z; (iii) x, y−1, z+1. |
Experimental details
Crystal data | |
Chemical formula | [PdCl2(C14H10N4)] |
Mr | 411.56 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 200 |
a, b, c (Å) | 8.1681 (10), 9.5480 (11), 10.1137 (12) |
α, β, γ (°) | 84.543 (2), 71.400 (2), 71.475 (2) |
V (Å3) | 708.81 (15) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 1.68 |
Crystal size (mm) | 0.26 × 0.16 × 0.12 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2000) |
Tmin, Tmax | 0.748, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5225, 3406, 2608 |
Rint | 0.025 |
(sin θ/λ)max (Å−1) | 0.667 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.046, 0.115, 1.24 |
No. of reflections | 3406 |
No. of parameters | 190 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.18, −2.09 |
Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009).
Pd1—N3 | 2.035 (5) | Pd1—Cl2 | 2.2787 (17) |
Pd1—N1 | 2.038 (5) | Pd1—Cl1 | 2.2860 (17) |
N3—Pd1—N1 | 80.24 (19) | Cl2—Pd1—Cl1 | 89.14 (6) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···Cl2i | 0.95 | 2.73 | 3.632 (7) | 159 |
C4—H4···Cl1 | 0.95 | 2.60 | 3.216 (7) | 123 |
C8—H8···N4ii | 0.95 | 2.58 | 3.529 (9) | 178 |
C9—H9···Cl2 | 0.95 | 2.62 | 3.241 (7) | 123 |
C13—H13···Cl2iii | 0.95 | 2.76 | 3.530 (7) | 139 |
Symmetry codes: (i) x, y−1, z; (ii) x, y+1, z; (iii) x, y−1, z+1. |
Acknowledgements
This work was supported by the Priority Research Centers Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010–0029626). The author thanks the KBSI, Jeonju Center, for the X-ray data collection.
References
Bruker (2000). SADABS, SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565. CrossRef IUCr Journals Google Scholar
Ha, K. (2011a). Acta Cryst. E67, m1230. Web of Science CSD CrossRef IUCr Journals Google Scholar
Ha, K. (2011b). Acta Cryst. E67, m1454. Web of Science CSD CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Spek, A. L. (2009). Acta Cryst. D65, 148–155. Web of Science CrossRef CAS IUCr Journals Google Scholar
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In the title complex, [PdCl2(dpp)] (dpp = 2,3-di-2-pyridylpyrazine, C14H10N4), the central PdII ion has a distorted square-planar coordination defined by two N atoms, one from the pyrazine ring and the other from pyridyl ring of the chelating dpp ligand and two Cl- anions (Fig. 1). The complex crystallized in the triclinic space group P1, whereas the previously reported analogous PtII complexes [PtX2(dpp)] (X = Br, Cl) crystallized in the monoclinic space group P21/n (Ha, 2011a,b).
The tight N1—Pd1—N3 chelate angle of 80.24 (19)° contributes the distortion of the square, which results in slightly bent trans axes [<Cl1—Pd1—N3 = 174.80 (14)° and <Cl2—Pd1—N1 = 175.50 (15)°]. The pairs of Pd—N and Pd—Cl bond lengths are nearly equal, respectively (Table 1). The pyridyl ring coordinated to the Pd atom is inclined slightly to its carrier pyrazine ring, making dihedral angle of 14.4 (3)°. By contrast, the uncoordinated pyridyl ring is inclined considerably to the pyrazine ring forming a dihedral angle of 52.2 (2)°. The dihedral angle between the two pyridyl rings is 58.8 (2)°. The complexes are connected by intermolecular C—H···Cl and C—H···N hydrogen bonds, forming a three-dimensional network (Fig. 2 and Table 2). There are also intramolecular C—H···Cl hydrogen bonds (Table 2). The molecules stack in columns along the a axis and display numerous inter- and intramolecular π-π interactions between the six-membered rings, with a shortest ring centroid-centroid distance of 3.848 (4) Å.