metal-organic compounds
cis-(Di-2-pyridylamine-κ2N2,N2′)bis(thiocyanato-κS)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
In the title complex, [Pt(NCS)2(C10H9N3)], the PtII ion is four-coordinated in a distorted square-planar environment by the two pyridine N atoms of the chelating di-2-pyridylamine (dpa) ligand and two mutually cis S atoms from two linear thiocyanate anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 30.8 (4)°. In the crystal, the complex molecules are stacked in columns along the a axis and are connected by intermolecular N—H⋯N hydrogen bonds, forming supramolecular chains along the b axis.
Related literature
For the II complex [PtCl2(dpa)], see: Li & Liu (2004); Tu et al. (2004); Zhang et al. (2006).
of the related chlorido PtExperimental
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/S1600536812010926/tk5067sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812010926/tk5067Isup2.hkl
To a solution of K2PtCl4 (0.2066 g, 0.498 mmol) in H2O (20 ml) and MeOH (10 ml) were added KSCN (0.5232 g, 5.384 mmol) and di-2-pyridylamine (0.0883 g, 0.516 mmol) and stirred for 7 h at room temperature. The formed precipitate was separated by filtration and washed with H2O and MeOH, and dried at 50 °C, to give a yellow powder (0.2182 g). Crystals suitable for X-ray analysis were obtained by slow evaporation from a CH3CN solution.
Carbon-bound 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)]. Nitrogen-bound H atom was located from Fourier difference maps then allowed to ride on its parent atom in the final cycles of 8 7 2), (0 11 4), (7 8 4), (2 99), (70 8), (7 5 7), (8 7 3), (8 8 0), (0 9 8), (7 4 7), (6 8 6), (8 6 3), (5 7 8), (4 7 9), (3 1 11), ( 6 6 2), (8 8 1), (8 7 1), (1 9 9), (0 10 5), (7 7 5), (2 4 11), (8\14), (48 8), (8 7 2), (2 5 11), (3 2 11), (1 10 4), and (2 11 4).
with N—H = 0.92 Å and Uiso(H) = 1.5 Ueq(N). The highest peak (3.96 e Å-3) and the deepest hole (-1.40 e Å-3) in the difference Fourier map are located 0.98 Å and 0.99 Å from the Pt1 atom, respectively. Owing to poor agreement, the following reflections were omitted from the final (Crystal structures of the related chlorido PtII complex, [PtCl2(dpa)] (dpa = di-2-pyridylamine, C10H9N3), have been reported previously (Li & Liu, 2004; Tu et al., 2004; Zhang et al., 2006).
In the title complex, [Pt(NCS)2(dpa)], the PtII ion is four-coordinated in a distorted square-planar environment by the two pyridyl N atoms of the chelating dpa ligand and two S atoms from two thiocyanate anions (Fig. 1). The dpa ligand is not planar with the dihedral angle between the least-squares planes of the pyridyl rings being 30.8 (4)°. The thiocyanato ligands are located on the same sides of the PtS2N2 plane and are almost linear with the bond angles <S1—C11—N4 = 177.4 (9)° and <S2—C12—N5 = 177.3 (9)°. The pairs of Pt—N and Pt—S bond lengths are nearly equivalent (Table 1). The complex molecules are stacked in columns along the a axis and are connected by intermolecular N—H···N hydrogen bonds, forming chains along the b axis (Fig. 2 and Table 2). In the columns, intermolecular π-π interactions between the pyridine rings are present, the ring centroid-centroid distance being 4.155 (5) Å.
For the
of the related chlorido PtII complex [PtCl2(dpa)], see: Li & Liu (2004); Tu et al. (2004); Zhang et al. (2006).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).[Pt(NCS)2(C10H9N3)] | Z = 2 |
Mr = 482.45 | F(000) = 452 |
Triclinic, P1 | Dx = 2.303 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.2282 (6) Å | Cell parameters from 3201 reflections |
b = 9.8308 (8) Å | θ = 2.8–25.9° |
c = 10.2501 (8) Å | µ = 10.38 mm−1 |
α = 94.292 (2)° | T = 200 K |
β = 93.081 (2)° | Block, yellow |
γ = 106.123 (2)° | 0.19 × 0.15 × 0.09 mm |
V = 695.64 (10) Å3 |
Bruker SMART 1000 CCD diffractometer | 2636 independent reflections |
Radiation source: fine-focus sealed tube | 2391 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.018 |
φ and ω scans | θmax = 26.0°, θmin = 2.0° |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | h = −8→8 |
Tmin = 0.812, Tmax = 1.000 | k = −12→11 |
4195 measured reflections | l = −12→12 |
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)] = 0.031 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.088 | H-atom parameters constrained |
S = 1.22 | w = 1/[σ2(Fo2) + (0.0179P)2 + 8.2228P] where P = (Fo2 + 2Fc2)/3 |
2636 reflections | (Δ/σ)max = 0.001 |
181 parameters | Δρmax = 3.96 e Å−3 |
0 restraints | Δρmin = −1.40 e Å−3 |
[Pt(NCS)2(C10H9N3)] | γ = 106.123 (2)° |
Mr = 482.45 | V = 695.64 (10) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.2282 (6) Å | Mo Kα radiation |
b = 9.8308 (8) Å | µ = 10.38 mm−1 |
c = 10.2501 (8) Å | T = 200 K |
α = 94.292 (2)° | 0.19 × 0.15 × 0.09 mm |
β = 93.081 (2)° |
Bruker SMART 1000 CCD diffractometer | 2636 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | 2391 reflections with I > 2σ(I) |
Tmin = 0.812, Tmax = 1.000 | Rint = 0.018 |
4195 measured reflections |
R[F2 > 2σ(F2)] = 0.031 | 0 restraints |
wR(F2) = 0.088 | H-atom parameters constrained |
S = 1.22 | Δρmax = 3.96 e Å−3 |
2636 reflections | Δρmin = −1.40 e Å−3 |
181 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 | 1.01671 (5) | 0.50573 (3) | 0.26893 (3) | 0.02699 (12) | |
S1 | 1.3097 (3) | 0.6767 (2) | 0.2720 (2) | 0.0351 (5) | |
S2 | 0.9284 (4) | 0.6445 (2) | 0.4314 (2) | 0.0367 (5) | |
N1 | 1.0971 (10) | 0.3699 (7) | 0.1344 (7) | 0.0256 (15) | |
N2 | 0.9426 (11) | 0.1761 (8) | 0.2524 (7) | 0.0307 (16) | |
H2N | 0.9464 | 0.0901 | 0.2805 | 0.046* | |
N3 | 0.7667 (10) | 0.3445 (7) | 0.2845 (7) | 0.0254 (15) | |
N4 | 1.2719 (12) | 0.8295 (9) | 0.0535 (9) | 0.043 (2) | |
N5 | 0.9605 (17) | 0.9069 (9) | 0.3291 (10) | 0.060 (3) | |
C1 | 1.2059 (12) | 0.4162 (9) | 0.0350 (9) | 0.0293 (19) | |
H1 | 1.2247 | 0.5119 | 0.0157 | 0.035* | |
C2 | 1.2890 (14) | 0.3335 (10) | −0.0382 (9) | 0.036 (2) | |
H2 | 1.3633 | 0.3698 | −0.1081 | 0.044* | |
C3 | 1.2635 (14) | 0.1923 (11) | −0.0089 (10) | 0.041 (2) | |
H3 | 1.3234 | 0.1322 | −0.0570 | 0.050* | |
C4 | 1.1520 (13) | 0.1437 (9) | 0.0890 (9) | 0.034 (2) | |
H4 | 1.1351 | 0.0490 | 0.1107 | 0.041* | |
C5 | 1.0619 (12) | 0.2315 (9) | 0.1582 (9) | 0.0272 (18) | |
C6 | 0.7784 (14) | 0.2105 (10) | 0.2872 (9) | 0.034 (2) | |
C7 | 0.6286 (13) | 0.1040 (10) | 0.3285 (10) | 0.038 (2) | |
H7 | 0.6401 | 0.0104 | 0.3319 | 0.045* | |
C8 | 0.4652 (15) | 0.1353 (12) | 0.3638 (10) | 0.048 (3) | |
H8 | 0.3619 | 0.0636 | 0.3925 | 0.058* | |
C9 | 0.4500 (14) | 0.2743 (12) | 0.3578 (9) | 0.042 (2) | |
H9 | 0.3369 | 0.2980 | 0.3818 | 0.051* | |
C10 | 0.6011 (12) | 0.3736 (11) | 0.3166 (9) | 0.035 (2) | |
H10 | 0.5906 | 0.4670 | 0.3101 | 0.042* | |
C11 | 1.2825 (13) | 0.7673 (10) | 0.1414 (10) | 0.035 (2) | |
C12 | 0.9486 (13) | 0.7994 (10) | 0.3678 (9) | 0.033 (2) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Pt1 | 0.0312 (2) | 0.02336 (19) | 0.0312 (2) | 0.01455 (14) | 0.00534 (13) | 0.00443 (13) |
S1 | 0.0337 (12) | 0.0298 (12) | 0.0411 (13) | 0.0094 (10) | −0.0007 (10) | −0.0008 (10) |
S2 | 0.0573 (15) | 0.0285 (12) | 0.0319 (12) | 0.0220 (11) | 0.0132 (11) | 0.0064 (9) |
N1 | 0.025 (4) | 0.017 (3) | 0.036 (4) | 0.007 (3) | 0.005 (3) | 0.003 (3) |
N2 | 0.039 (4) | 0.023 (4) | 0.034 (4) | 0.014 (3) | 0.006 (3) | 0.006 (3) |
N3 | 0.025 (4) | 0.021 (3) | 0.029 (4) | 0.003 (3) | 0.004 (3) | 0.009 (3) |
N4 | 0.031 (4) | 0.033 (5) | 0.064 (6) | 0.006 (4) | 0.005 (4) | 0.014 (4) |
N5 | 0.100 (8) | 0.028 (5) | 0.066 (7) | 0.033 (5) | 0.030 (6) | 0.018 (4) |
C1 | 0.027 (4) | 0.025 (4) | 0.038 (5) | 0.012 (4) | 0.005 (4) | 0.002 (4) |
C2 | 0.041 (5) | 0.037 (5) | 0.028 (5) | 0.007 (4) | 0.007 (4) | −0.002 (4) |
C3 | 0.030 (5) | 0.046 (6) | 0.053 (6) | 0.020 (5) | 0.007 (5) | −0.002 (5) |
C4 | 0.039 (5) | 0.021 (4) | 0.039 (5) | 0.007 (4) | −0.012 (4) | −0.007 (4) |
C5 | 0.025 (4) | 0.021 (4) | 0.037 (5) | 0.010 (3) | −0.003 (4) | −0.003 (3) |
C6 | 0.039 (5) | 0.039 (5) | 0.028 (5) | 0.015 (4) | 0.001 (4) | 0.003 (4) |
C7 | 0.033 (5) | 0.028 (5) | 0.044 (6) | −0.008 (4) | 0.004 (4) | 0.010 (4) |
C8 | 0.035 (6) | 0.056 (7) | 0.042 (6) | −0.007 (5) | 0.007 (5) | 0.010 (5) |
C9 | 0.032 (5) | 0.068 (7) | 0.025 (5) | 0.018 (5) | −0.006 (4) | −0.011 (5) |
C10 | 0.022 (4) | 0.047 (6) | 0.040 (5) | 0.014 (4) | 0.004 (4) | 0.005 (4) |
C11 | 0.031 (5) | 0.024 (5) | 0.050 (6) | 0.008 (4) | 0.011 (4) | 0.006 (4) |
C12 | 0.036 (5) | 0.027 (5) | 0.038 (5) | 0.012 (4) | 0.009 (4) | 0.003 (4) |
Pt1—N1 | 2.065 (7) | C1—H1 | 0.9500 |
Pt1—N3 | 2.069 (7) | C2—C3 | 1.406 (14) |
Pt1—S2 | 2.302 (2) | C2—H2 | 0.9500 |
Pt1—S1 | 2.306 (2) | C3—C4 | 1.352 (14) |
S1—C11 | 1.694 (10) | C3—H3 | 0.9500 |
S2—C12 | 1.674 (9) | C4—C5 | 1.394 (12) |
N1—C1 | 1.349 (11) | C4—H4 | 0.9500 |
N1—C5 | 1.356 (10) | C6—C7 | 1.390 (13) |
N2—C5 | 1.371 (11) | C7—C8 | 1.361 (15) |
N2—C6 | 1.379 (12) | C7—H7 | 0.9500 |
N2—H2N | 0.9200 | C8—C9 | 1.407 (16) |
N3—C6 | 1.346 (11) | C8—H8 | 0.9500 |
N3—C10 | 1.356 (11) | C9—C10 | 1.358 (14) |
N4—C11 | 1.137 (12) | C9—H9 | 0.9500 |
N5—C12 | 1.139 (12) | C10—H10 | 0.9500 |
C1—C2 | 1.347 (12) | ||
N1—Pt1—N3 | 88.1 (3) | C2—C3—H3 | 120.6 |
N1—Pt1—S2 | 175.3 (2) | C3—C4—C5 | 120.5 (9) |
N3—Pt1—S2 | 89.9 (2) | C3—C4—H4 | 119.7 |
N1—Pt1—S1 | 92.6 (2) | C5—C4—H4 | 119.7 |
N3—Pt1—S1 | 173.6 (2) | N1—C5—N2 | 121.2 (7) |
S2—Pt1—S1 | 89.04 (9) | N1—C5—C4 | 120.0 (8) |
C11—S1—Pt1 | 103.7 (3) | N2—C5—C4 | 118.7 (8) |
C12—S2—Pt1 | 104.4 (3) | N3—C6—N2 | 120.6 (8) |
C1—N1—C5 | 118.6 (7) | N3—C6—C7 | 121.3 (9) |
C1—N1—Pt1 | 122.7 (5) | N2—C6—C7 | 118.1 (9) |
C5—N1—Pt1 | 118.0 (6) | C8—C7—C6 | 119.3 (10) |
C5—N2—C6 | 127.6 (7) | C8—C7—H7 | 120.3 |
C5—N2—H2N | 118.5 | C6—C7—H7 | 120.3 |
C6—N2—H2N | 111.5 | C7—C8—C9 | 119.7 (9) |
C6—N3—C10 | 118.9 (8) | C7—C8—H8 | 120.2 |
C6—N3—Pt1 | 118.7 (6) | C9—C8—H8 | 120.2 |
C10—N3—Pt1 | 121.3 (6) | C10—C9—C8 | 118.2 (9) |
C2—C1—N1 | 123.3 (8) | C10—C9—H9 | 120.9 |
C2—C1—H1 | 118.4 | C8—C9—H9 | 120.9 |
N1—C1—H1 | 118.4 | N3—C10—C9 | 122.6 (9) |
C1—C2—C3 | 118.5 (9) | N3—C10—H10 | 118.7 |
C1—C2—H2 | 120.7 | C9—C10—H10 | 118.7 |
C3—C2—H2 | 120.7 | N4—C11—S1 | 177.4 (9) |
C4—C3—C2 | 118.8 (9) | N5—C12—S2 | 177.3 (9) |
C4—C3—H3 | 120.6 | ||
N1—Pt1—S1—C11 | 84.1 (4) | C1—N1—C5—C4 | 6.0 (12) |
S2—Pt1—S1—C11 | −100.3 (3) | Pt1—N1—C5—C4 | −164.9 (6) |
N3—Pt1—S2—C12 | −129.1 (4) | C6—N2—C5—N1 | 35.0 (13) |
S1—Pt1—S2—C12 | 57.3 (4) | C6—N2—C5—C4 | −146.8 (9) |
N3—Pt1—N1—C1 | 149.1 (7) | C3—C4—C5—N1 | −4.9 (13) |
S1—Pt1—N1—C1 | −37.3 (7) | C3—C4—C5—N2 | 176.8 (8) |
N3—Pt1—N1—C5 | −40.4 (6) | C10—N3—C6—N2 | 178.5 (8) |
S1—Pt1—N1—C5 | 133.2 (6) | Pt1—N3—C6—N2 | −13.8 (11) |
N1—Pt1—N3—C6 | 40.9 (7) | C10—N3—C6—C7 | −3.3 (13) |
S2—Pt1—N3—C6 | −134.9 (6) | Pt1—N3—C6—C7 | 164.4 (7) |
N1—Pt1—N3—C10 | −151.7 (7) | C5—N2—C6—N3 | −34.6 (14) |
S2—Pt1—N3—C10 | 32.5 (7) | C5—N2—C6—C7 | 147.1 (9) |
C5—N1—C1—C2 | −3.2 (13) | N3—C6—C7—C8 | 1.5 (15) |
Pt1—N1—C1—C2 | 167.3 (7) | N2—C6—C7—C8 | 179.8 (9) |
N1—C1—C2—C3 | −0.8 (14) | C6—C7—C8—C9 | 0.2 (15) |
C1—C2—C3—C4 | 1.9 (14) | C7—C8—C9—C10 | −0.2 (15) |
C2—C3—C4—C5 | 0.9 (14) | C6—N3—C10—C9 | 3.4 (13) |
C1—N1—C5—N2 | −175.9 (8) | Pt1—N3—C10—C9 | −164.0 (7) |
Pt1—N1—C5—N2 | 13.2 (10) | C8—C9—C10—N3 | −1.6 (14) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2N···N5i | 0.92 | 1.93 | 2.851 (11) | 176 |
Symmetry code: (i) x, y−1, z. |
Experimental details
Crystal data | |
Chemical formula | [Pt(NCS)2(C10H9N3)] |
Mr | 482.45 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 200 |
a, b, c (Å) | 7.2282 (6), 9.8308 (8), 10.2501 (8) |
α, β, γ (°) | 94.292 (2), 93.081 (2), 106.123 (2) |
V (Å3) | 695.64 (10) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 10.38 |
Crystal size (mm) | 0.19 × 0.15 × 0.09 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2000) |
Tmin, Tmax | 0.812, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4195, 2636, 2391 |
Rint | 0.018 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.031, 0.088, 1.22 |
No. of reflections | 2636 |
No. of parameters | 181 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 3.96, −1.40 |
Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009).
Pt1—N1 | 2.065 (7) | Pt1—S2 | 2.302 (2) |
Pt1—N3 | 2.069 (7) | Pt1—S1 | 2.306 (2) |
N1—Pt1—N3 | 88.1 (3) | S2—Pt1—S1 | 89.04 (9) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2N···N5i | 0.92 | 1.93 | 2.851 (11) | 176.4 |
Symmetry code: (i) x, y−1, z. |
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 (2011–0030747).
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
Li, D. & Liu, D. (2004). Cryst. Res. Technol. 39, 359–362. 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
Spek, A. L. (2009). Acta Cryst. D65, 148–155. Web of Science CrossRef CAS IUCr Journals Google Scholar
Tu, C., Wu, X., Liu, Q., Wang, X., Xu, Q. & Guo, Z. (2004). Inorg. Chim. Acta, 357, 95–102. Web of Science CSD CrossRef CAS Google Scholar
Zhang, F., Prokopchuk, E. M., Broczkowski, M. E., Jennings, M. C. & Puddephatt, R. J. (2006). Organometallics, 25, 1583–1591. Web of Science CSD CrossRef CAS Google Scholar
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Crystal structures of the related chlorido PtII complex, [PtCl2(dpa)] (dpa = di-2-pyridylamine, C10H9N3), have been reported previously (Li & Liu, 2004; Tu et al., 2004; Zhang et al., 2006).
In the title complex, [Pt(NCS)2(dpa)], the PtII ion is four-coordinated in a distorted square-planar environment by the two pyridyl N atoms of the chelating dpa ligand and two S atoms from two thiocyanate anions (Fig. 1). The dpa ligand is not planar with the dihedral angle between the least-squares planes of the pyridyl rings being 30.8 (4)°. The thiocyanato ligands are located on the same sides of the PtS2N2 plane and are almost linear with the bond angles <S1—C11—N4 = 177.4 (9)° and <S2—C12—N5 = 177.3 (9)°. The pairs of Pt—N and Pt—S bond lengths are nearly equivalent (Table 1). The complex molecules are stacked in columns along the a axis and are connected by intermolecular N—H···N hydrogen bonds, forming chains along the b axis (Fig. 2 and Table 2). In the columns, intermolecular π-π interactions between the pyridine rings are present, the ring centroid-centroid distance being 4.155 (5) Å.