metal-organic compounds
Dichlorido(2,3-di-2-pyridylpyrazine-κ2N1,N2)platinum(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 PtII ion in the title complex, [PtCl2(C14H10N4)], is four-coordinated in a distorted square-planar environment by two N atoms of a chelating 2,3-di-2-pyridylpyrazine ligand and two chloride anions. The pyridyl ring coordinated to the PtII atom is inclined slightly to its carrier pyrazine ring [dihedral angle = 13.5 (1)°], whereas the uncoordinated pyridyl ring is inclined considerably to the pyrazine ring [dihedral angle = 54.3 (2)°]. The dihedral angle between the two pyridyl rings is 59.2 (2)°. In the crystal, the complexes are assembled through intermolecular C—H⋯N and C—H⋯Cl hydrogen bonds, forming a three-dimensional network. Intramolecular C—H⋯N and 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
https://doi.org/10.1107/S1600536811038906/tk2794sup1.cif
contains datablock I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811038906/tk2794Isup2.hkl
The title complex was obtained as a by-product from the reaction of K2PtCl4 (0.2077 g, 0.500 mmol) with 2,3-di-2-pyridylpyrazine (0.1173 g, 0.501 mmol) in MeOH (30 ml) and H2O (20 ml). After stirring of the reaction mixture for 48 h at room temperature, the formed precipitate was separated by filtration, washed with H2O and acetone, to give the main product as a red-brown powder (0.1323 g). The yellow by-product (0.0082 g) was obtained from the mixture of filtrate and washing solution. Crystals were obtained by slow evaporation from a CH3NO2 solution of the by-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 (1.83 e Å-3) and the deepest hole (-0.83 e Å-3) in the final difference Fourier map were located 0.89 Å and 0.88 Å from the Cl1 and Pt1 atoms, respectively.
The title complex, [PtCl2(dpp)] (where dpp is 2,3-di-2-pyridylpyrazine, C14H10N4), is isomorphous with the analogous PtII complex [PtBr2(dpp)] (Ha, 2011).
In the complex, the PtII ion is four-coordinated in a distorted square-planar environment by two N atoms from the pyrazine ring and the one pyridyl ring of the chelating dpp ligand and two chloride anions (Fig. 1). The main contribution to the distortion of the square-plane is the tight N1—Pt1—N3 chelate angle of 80.25 (13)°, which results in slightly bent trans axes [<Cl1—Pt1—N3 = 174.63 (10)° and <Cl2—Pt1—N1 = 176.21 (10)°]. The pairs of Pt—N and Pt—Br bond lengths are experimentally equivalent (Table 1). In the molecule, the pyridyl ring coordinated to the Pt atom is inclined slightly to its carrier pyrazine ring, making dihedral angle of 13.5 (1)°. On the contrary, the uncoordinated pyridyl ring is inclined considerably to the pyrazine ring with a dihedral angle of 54.3 (2)°. The dihedral angle between the two pyridyl rings is 59.2 (2)°.
The complex molecules are assembled through intermolecular C—H···N and C—H···Cl hydrogen bonds to form a three-dimensional network (Fig. 2 and Table 2). There are also intramolecular C—H···N and C—H···Cl hydrogen bonds (Table 2). The complexes stack in columns along the c axis and display several intermolecular π-π interactions between the six-membered rings, with a shortest ring centroid-centroid distance of 4.213 (3) Å.
For the synthesis and
of [PtBr2(C14H10N4)], see: Ha (2011).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).[PtCl2(C14H10N4)] | F(000) = 936 |
Mr = 500.25 | Dx = 2.344 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 5943 reflections |
a = 8.894 (5) Å | θ = 2.4–28.3° |
b = 9.711 (5) Å | µ = 10.27 mm−1 |
c = 16.461 (9) Å | T = 200 K |
β = 94.429 (11)° | Block, yellow |
V = 1417.5 (13) Å3 | 0.28 × 0.15 × 0.11 mm |
Z = 4 |
Bruker SMART 1000 CCD diffractometer | 3370 independent reflections |
Radiation source: fine-focus sealed tube | 2756 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.029 |
φ and ω scans | θmax = 28.4°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | h = −11→11 |
Tmin = 0.638, Tmax = 1.000 | k = −12→12 |
9749 measured reflections | l = −21→17 |
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)] = 0.024 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.056 | H-atom parameters constrained |
S = 1.02 | w = 1/[σ2(Fo2) + (0.0244P)2] where P = (Fo2 + 2Fc2)/3 |
3370 reflections | (Δ/σ)max = 0.001 |
190 parameters | Δρmax = 1.83 e Å−3 |
0 restraints | Δρmin = −0.83 e Å−3 |
[PtCl2(C14H10N4)] | V = 1417.5 (13) Å3 |
Mr = 500.25 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 8.894 (5) Å | µ = 10.27 mm−1 |
b = 9.711 (5) Å | T = 200 K |
c = 16.461 (9) Å | 0.28 × 0.15 × 0.11 mm |
β = 94.429 (11)° |
Bruker SMART 1000 CCD diffractometer | 3370 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | 2756 reflections with I > 2σ(I) |
Tmin = 0.638, Tmax = 1.000 | Rint = 0.029 |
9749 measured reflections |
R[F2 > 2σ(F2)] = 0.024 | 0 restraints |
wR(F2) = 0.056 | H-atom parameters constrained |
S = 1.02 | Δρmax = 1.83 e Å−3 |
3370 reflections | Δρmin = −0.83 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 | ||
Pt1 | 0.364118 (17) | 0.639554 (16) | 0.379000 (10) | 0.02301 (6) | |
Cl1 | 0.44494 (14) | 0.85790 (11) | 0.41230 (9) | 0.0410 (3) | |
Cl2 | 0.12714 (12) | 0.72595 (12) | 0.34708 (7) | 0.0362 (3) | |
N1 | 0.5650 (4) | 0.5518 (3) | 0.4076 (2) | 0.0215 (7) | |
N2 | 0.8366 (4) | 0.4154 (4) | 0.4387 (2) | 0.0260 (8) | |
N3 | 0.3108 (4) | 0.4412 (4) | 0.3556 (2) | 0.0229 (8) | |
N4 | 0.6997 (4) | 0.1724 (4) | 0.3059 (2) | 0.0288 (8) | |
C1 | 0.5721 (4) | 0.4119 (4) | 0.3971 (2) | 0.0207 (8) | |
C2 | 0.7128 (4) | 0.3476 (4) | 0.4088 (2) | 0.0209 (9) | |
C3 | 0.8227 (5) | 0.5502 (4) | 0.4532 (3) | 0.0290 (10) | |
H3 | 0.9075 | 0.5992 | 0.4769 | 0.035* | |
C4 | 0.6902 (5) | 0.6200 (4) | 0.4350 (3) | 0.0259 (9) | |
H4 | 0.6870 | 0.7171 | 0.4418 | 0.031* | |
C5 | 0.4224 (5) | 0.3480 (4) | 0.3745 (3) | 0.0228 (9) | |
C6 | 0.3948 (5) | 0.2085 (5) | 0.3771 (3) | 0.0297 (10) | |
H6 | 0.4729 | 0.1454 | 0.3936 | 0.036* | |
C7 | 0.2471 (5) | 0.1621 (4) | 0.3545 (3) | 0.0300 (10) | |
H7 | 0.2236 | 0.0668 | 0.3565 | 0.036* | |
C8 | 0.1382 (5) | 0.2558 (5) | 0.3297 (3) | 0.0324 (11) | |
H8 | 0.0400 | 0.2257 | 0.3108 | 0.039* | |
C9 | 0.1721 (5) | 0.3938 (5) | 0.3324 (3) | 0.0314 (10) | |
H9 | 0.0945 | 0.4582 | 0.3173 | 0.038* | |
C10 | 0.7422 (4) | 0.2020 (4) | 0.3837 (2) | 0.0216 (9) | |
C11 | 0.8186 (5) | 0.1104 (4) | 0.4368 (3) | 0.0280 (10) | |
H11 | 0.8450 | 0.1352 | 0.4919 | 0.034* | |
C12 | 0.8553 (5) | −0.0175 (5) | 0.4078 (3) | 0.0349 (11) | |
H12 | 0.9090 | −0.0819 | 0.4424 | 0.042* | |
C13 | 0.8132 (5) | −0.0508 (5) | 0.3275 (3) | 0.0346 (11) | |
H13 | 0.8371 | −0.1380 | 0.3059 | 0.041* | |
C14 | 0.7356 (5) | 0.0462 (5) | 0.2800 (3) | 0.0320 (11) | |
H14 | 0.7053 | 0.0223 | 0.2251 | 0.038* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Pt1 | 0.02249 (10) | 0.02038 (10) | 0.02625 (10) | 0.00622 (7) | 0.00249 (7) | 0.00141 (7) |
Cl1 | 0.0379 (7) | 0.0187 (6) | 0.0665 (9) | 0.0050 (5) | 0.0044 (6) | −0.0015 (5) |
Cl2 | 0.0281 (6) | 0.0377 (6) | 0.0421 (7) | 0.0163 (5) | −0.0008 (5) | 0.0003 (5) |
N1 | 0.0188 (17) | 0.0216 (18) | 0.0243 (18) | 0.0027 (14) | 0.0033 (14) | 0.0017 (14) |
N2 | 0.0217 (18) | 0.0280 (19) | 0.028 (2) | 0.0017 (16) | −0.0002 (15) | −0.0016 (16) |
N3 | 0.0141 (16) | 0.026 (2) | 0.0280 (19) | 0.0044 (15) | −0.0008 (14) | 0.0001 (15) |
N4 | 0.028 (2) | 0.031 (2) | 0.028 (2) | 0.0018 (16) | 0.0037 (16) | −0.0023 (16) |
C1 | 0.024 (2) | 0.018 (2) | 0.021 (2) | 0.0021 (17) | 0.0024 (17) | 0.0021 (16) |
C2 | 0.019 (2) | 0.023 (2) | 0.021 (2) | 0.0014 (16) | −0.0006 (16) | 0.0040 (16) |
C3 | 0.027 (2) | 0.030 (2) | 0.030 (2) | −0.0040 (19) | −0.0012 (19) | −0.0042 (19) |
C4 | 0.024 (2) | 0.022 (2) | 0.032 (2) | −0.0016 (17) | 0.0037 (19) | −0.0034 (17) |
C5 | 0.023 (2) | 0.021 (2) | 0.025 (2) | 0.0007 (17) | 0.0037 (17) | 0.0001 (17) |
C6 | 0.024 (2) | 0.031 (2) | 0.035 (3) | 0.001 (2) | 0.004 (2) | 0.000 (2) |
C7 | 0.024 (2) | 0.028 (3) | 0.039 (3) | −0.0041 (19) | 0.006 (2) | −0.0041 (19) |
C8 | 0.021 (2) | 0.034 (3) | 0.042 (3) | −0.0058 (19) | 0.002 (2) | −0.009 (2) |
C9 | 0.023 (2) | 0.033 (3) | 0.038 (3) | 0.0064 (19) | 0.000 (2) | −0.001 (2) |
C10 | 0.0161 (19) | 0.023 (2) | 0.026 (2) | 0.0019 (17) | 0.0046 (17) | −0.0011 (17) |
C11 | 0.024 (2) | 0.031 (3) | 0.028 (2) | 0.0054 (18) | −0.0043 (19) | −0.0010 (18) |
C12 | 0.031 (3) | 0.028 (2) | 0.045 (3) | 0.008 (2) | −0.006 (2) | 0.001 (2) |
C13 | 0.032 (3) | 0.025 (2) | 0.048 (3) | 0.005 (2) | 0.006 (2) | −0.008 (2) |
C14 | 0.032 (2) | 0.035 (3) | 0.029 (3) | −0.002 (2) | 0.002 (2) | −0.008 (2) |
Pt1—N1 | 2.003 (3) | C4—H4 | 0.9500 |
Pt1—N3 | 2.014 (4) | C5—C6 | 1.378 (6) |
Pt1—Cl2 | 2.2916 (15) | C6—C7 | 1.411 (6) |
Pt1—Cl1 | 2.2918 (15) | C6—H6 | 0.9500 |
N1—C4 | 1.344 (5) | C7—C8 | 1.368 (6) |
N1—C1 | 1.372 (5) | C7—H7 | 0.9500 |
N2—C3 | 1.337 (5) | C8—C9 | 1.374 (6) |
N2—C2 | 1.343 (5) | C8—H8 | 0.9500 |
N3—C9 | 1.344 (5) | C9—H9 | 0.9500 |
N3—C5 | 1.361 (5) | C10—C11 | 1.388 (6) |
N4—C10 | 1.339 (5) | C11—C12 | 1.379 (6) |
N4—C14 | 1.344 (5) | C11—H11 | 0.9500 |
C1—C2 | 1.399 (5) | C12—C13 | 1.383 (7) |
C1—C5 | 1.489 (6) | C12—H12 | 0.9500 |
C2—C10 | 1.501 (5) | C13—C14 | 1.375 (6) |
C3—C4 | 1.373 (6) | C13—H13 | 0.9500 |
C3—H3 | 0.9500 | C14—H14 | 0.9500 |
N1—Pt1—N3 | 80.25 (13) | C6—C5—C1 | 124.0 (4) |
N1—Pt1—Cl2 | 176.21 (10) | C5—C6—C7 | 118.0 (4) |
N3—Pt1—Cl2 | 96.16 (10) | C5—C6—H6 | 121.0 |
N1—Pt1—Cl1 | 94.59 (10) | C7—C6—H6 | 121.0 |
N3—Pt1—Cl1 | 174.63 (10) | C8—C7—C6 | 119.3 (4) |
Cl2—Pt1—Cl1 | 88.97 (5) | C8—C7—H7 | 120.3 |
C4—N1—C1 | 119.1 (3) | C6—C7—H7 | 120.3 |
C4—N1—Pt1 | 124.8 (3) | C7—C8—C9 | 119.3 (4) |
C1—N1—Pt1 | 116.2 (3) | C7—C8—H8 | 120.3 |
C3—N2—C2 | 117.5 (4) | C9—C8—H8 | 120.3 |
C9—N3—C5 | 118.3 (4) | N3—C9—C8 | 122.5 (4) |
C9—N3—Pt1 | 125.4 (3) | N3—C9—H9 | 118.7 |
C5—N3—Pt1 | 115.8 (3) | C8—C9—H9 | 118.7 |
C10—N4—C14 | 116.3 (4) | N4—C10—C11 | 123.6 (4) |
N1—C1—C2 | 118.3 (4) | N4—C10—C2 | 115.0 (4) |
N1—C1—C5 | 113.3 (3) | C11—C10—C2 | 121.1 (4) |
C2—C1—C5 | 128.4 (4) | C12—C11—C10 | 118.4 (4) |
N2—C2—C1 | 122.1 (4) | C12—C11—H11 | 120.8 |
N2—C2—C10 | 114.1 (3) | C10—C11—H11 | 120.8 |
C1—C2—C10 | 123.7 (4) | C11—C12—C13 | 119.2 (4) |
N2—C3—C4 | 122.3 (4) | C11—C12—H12 | 120.4 |
N2—C3—H3 | 118.9 | C13—C12—H12 | 120.4 |
C4—C3—H3 | 118.9 | C14—C13—C12 | 118.1 (4) |
N1—C4—C3 | 120.3 (4) | C14—C13—H13 | 121.0 |
N1—C4—H4 | 119.8 | C12—C13—H13 | 121.0 |
C3—C4—H4 | 119.8 | N4—C14—C13 | 124.3 (4) |
N3—C5—C6 | 122.1 (4) | N4—C14—H14 | 117.8 |
N3—C5—C1 | 113.7 (3) | C13—C14—H14 | 117.8 |
N3—Pt1—N1—C4 | −179.3 (3) | Pt1—N3—C5—C1 | −9.1 (4) |
Cl1—Pt1—N1—C4 | −0.8 (3) | N1—C1—C5—N3 | 10.1 (5) |
N3—Pt1—N1—C1 | 1.3 (3) | C2—C1—C5—N3 | −170.4 (4) |
Cl1—Pt1—N1—C1 | 179.8 (3) | N1—C1—C5—C6 | −166.0 (4) |
N1—Pt1—N3—C9 | 176.5 (4) | C2—C1—C5—C6 | 13.5 (7) |
Cl2—Pt1—N3—C9 | −2.3 (3) | N3—C5—C6—C7 | 3.8 (6) |
N1—Pt1—N3—C5 | 4.6 (3) | C1—C5—C6—C7 | 179.6 (4) |
Cl2—Pt1—N3—C5 | −174.2 (3) | C5—C6—C7—C8 | 1.2 (6) |
C4—N1—C1—C2 | −5.3 (5) | C6—C7—C8—C9 | −4.3 (7) |
Pt1—N1—C1—C2 | 174.0 (3) | C5—N3—C9—C8 | 2.2 (6) |
C4—N1—C1—C5 | 174.2 (3) | Pt1—N3—C9—C8 | −169.5 (3) |
Pt1—N1—C1—C5 | −6.4 (4) | C7—C8—C9—N3 | 2.7 (7) |
C3—N2—C2—C1 | −3.5 (6) | C14—N4—C10—C11 | −0.2 (6) |
C3—N2—C2—C10 | 172.2 (3) | C14—N4—C10—C2 | 174.8 (3) |
N1—C1—C2—N2 | 7.7 (6) | N2—C2—C10—N4 | −122.6 (4) |
C5—C1—C2—N2 | −171.8 (4) | C1—C2—C10—N4 | 52.9 (5) |
N1—C1—C2—C10 | −167.5 (4) | N2—C2—C10—C11 | 52.5 (5) |
C5—C1—C2—C10 | 13.0 (6) | C1—C2—C10—C11 | −131.9 (4) |
C2—N2—C3—C4 | −3.1 (6) | N4—C10—C11—C12 | 1.1 (6) |
C1—N1—C4—C3 | −0.9 (6) | C2—C10—C11—C12 | −173.6 (4) |
Pt1—N1—C4—C3 | 179.8 (3) | C10—C11—C12—C13 | −0.9 (7) |
N2—C3—C4—N1 | 5.4 (6) | C11—C12—C13—C14 | −0.1 (7) |
C9—N3—C5—C6 | −5.5 (6) | C10—N4—C14—C13 | −0.9 (6) |
Pt1—N3—C5—C6 | 167.0 (3) | C12—C13—C14—N4 | 1.1 (7) |
C9—N3—C5—C1 | 178.3 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···N2i | 0.95 | 2.58 | 3.410 (6) | 147 |
C4—H4···Cl1 | 0.95 | 2.57 | 3.180 (4) | 123 |
C6—H6···Cl1ii | 0.95 | 2.82 | 3.477 (5) | 127 |
C6—H6···N4 | 0.95 | 2.58 | 3.056 (6) | 111 |
C9—H9···Cl2 | 0.95 | 2.66 | 3.261 (5) | 122 |
C13—H13···N4iii | 0.95 | 2.61 | 3.468 (6) | 151 |
Symmetry codes: (i) −x+2, −y+1, −z+1; (ii) x, y−1, z; (iii) −x+3/2, y−1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | [PtCl2(C14H10N4)] |
Mr | 500.25 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 200 |
a, b, c (Å) | 8.894 (5), 9.711 (5), 16.461 (9) |
β (°) | 94.429 (11) |
V (Å3) | 1417.5 (13) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 10.27 |
Crystal size (mm) | 0.28 × 0.15 × 0.11 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2000) |
Tmin, Tmax | 0.638, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9749, 3370, 2756 |
Rint | 0.029 |
(sin θ/λ)max (Å−1) | 0.668 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.024, 0.056, 1.02 |
No. of reflections | 3370 |
No. of parameters | 190 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.83, −0.83 |
Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009).
Pt1—N1 | 2.003 (3) | Pt1—Cl2 | 2.2916 (15) |
Pt1—N3 | 2.014 (4) | Pt1—Cl1 | 2.2918 (15) |
N1—Pt1—N3 | 80.25 (13) | Cl2—Pt1—Cl1 | 88.97 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···N2i | 0.95 | 2.58 | 3.410 (6) | 147 |
C4—H4···Cl1 | 0.95 | 2.57 | 3.180 (4) | 123 |
C6—H6···Cl1ii | 0.95 | 2.82 | 3.477 (5) | 127 |
C6—H6···N4 | 0.95 | 2.58 | 3.056 (6) | 111 |
C9—H9···Cl2 | 0.95 | 2.66 | 3.261 (5) | 122 |
C13—H13···N4iii | 0.95 | 2.61 | 3.468 (6) | 151 |
Symmetry codes: (i) −x+2, −y+1, −z+1; (ii) x, y−1, z; (iii) −x+3/2, y−1/2, −z+1/2. |
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).
References
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The title complex, [PtCl2(dpp)] (where dpp is 2,3-di-2-pyridylpyrazine, C14H10N4), is isomorphous with the analogous PtII complex [PtBr2(dpp)] (Ha, 2011).
In the complex, the PtII ion is four-coordinated in a distorted square-planar environment by two N atoms from the pyrazine ring and the one pyridyl ring of the chelating dpp ligand and two chloride anions (Fig. 1). The main contribution to the distortion of the square-plane is the tight N1—Pt1—N3 chelate angle of 80.25 (13)°, which results in slightly bent trans axes [<Cl1—Pt1—N3 = 174.63 (10)° and <Cl2—Pt1—N1 = 176.21 (10)°]. The pairs of Pt—N and Pt—Br bond lengths are experimentally equivalent (Table 1). In the molecule, the pyridyl ring coordinated to the Pt atom is inclined slightly to its carrier pyrazine ring, making dihedral angle of 13.5 (1)°. On the contrary, the uncoordinated pyridyl ring is inclined considerably to the pyrazine ring with a dihedral angle of 54.3 (2)°. The dihedral angle between the two pyridyl rings is 59.2 (2)°.
The complex molecules are assembled through intermolecular C—H···N and C—H···Cl hydrogen bonds to form a three-dimensional network (Fig. 2 and Table 2). There are also intramolecular C—H···N and C—H···Cl hydrogen bonds (Table 2). The complexes stack in columns along the c axis and display several intermolecular π-π interactions between the six-membered rings, with a shortest ring centroid-centroid distance of 4.213 (3) Å.