metal-organic compounds
(Acridine-κN)(dimethyl sulfoxide-κS)diiodidoplatinum(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, [PtI2(C13H9N)(C2H6OS)], the PtII atom is four-coordinated in an essentially square-planar environment defined by the N atom of the acridine ligand, the S atom of dimethyl sulfoxide, and two iodide ions. The dihedral angle between the nearly planar PtI2NS unit [maximum deviation = 0.083 (2) Å] and the acridine ligand [maximum deviation = 0.038 (6) Å] is 89.29 (7)°. In the the complex molecules are arranged in a V-shaped packing pattern along the c axis and linked by intermolecular C—H⋯O contacts into supramolecular chains. There are also several intermolecular π–π interactions between the six-membered rings, with a shortest ring centroid–centroid distance of 3.804 (5) Å.
Related literature
For the crystal structures of [PtCl2(acr)2] (acr = acridine) and [PtCl(pic)(DMSO)] (pic = pyridine-2-carboxylate, DMSO = dimethyl sulfoxide), see: Ha (2010a,b).
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/S1600536810031387/tk2697sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810031387/tk2697Isup2.hkl
To a solution of K2PtCl4 (0.2017 g, 0.486 mmol) and KI (0.6410 g, 3.861 mmol) in H2O (30 ml) was added acridine (0.1903 g, 1.062 mmol) followed by refluxing for 3 h. The precipitate was then separated by filtration, washed with H2O and EtOH, and dried under vacuum, to give a dark-yellow powder (0.2772 g). Crystals suitable for X-ray analysis were obtained by slow evaporation from a dimethyl sulfoxide at 353 K.
H atoms were positioned geometrically and allowed to ride on their respective parent atoms [C—H = 0.95 Å (CH) or 0.98 Å (CH3) and Uiso(H) = 1.2Ueq(C) or 1.5Ueq(methyl-C)]. The highest peak (2.10 e Å-3) and the deepest hole (-1.16 e Å-3) in the difference Fourier map were located 1.05 and 1.64 Å from the atoms Pt1 and I2, respectively.
Single crystals of the title complex, [PtI2(C13H9N)(C2H6OS)] (where C13H9N is acridine (acr) and C2H6OS is dimethyl sulfoxide (DMSO)), were unexpectedly obtained from a DMSO solution of the dark-yellow reaction product [PtI2(acr)2] held at 353 K. It seems that an acridine ligand of the complex [PtI2(acr)2] was replaced by a DMSO molecule during crystallization, whereas the analogous Pt complex [PtCl2(acr)2] crystallized without substitution in a DMSO solution at 353 K (Ha, 2010a). In the title complex, the PtII atom is four-coordinated in an essentially square-planar environment defined by the N atom of the acridine ligand, the S atom of the dimethyl sulfoxide molecule and two iodide ions (Table 1 and Fig. 1). The dihedral angle between the nearly planar PtI2NS moiety and acridine ligand is 89.29 (7)°. The I atoms are in π-π interactions between six-membered rings, with the shortest ring centroid-centroid distance being 3.804 (5) Å.
conformation with respect to each other (<I1—Pt1—I2 = 174.03 (2)°) and almost perpendicular to the acridine ligand, with N1—Pt1—I1/2 bond angles of 85.75 (16)° and 89.21 (16)°. The Pt—S bond length (2.222 (2) Å) is comparable to those observed in the Pt-DMSO complex [PtCl(pic)(DMSO)] (2.202 (2) Å, where pic is pyridine-2-carboxylate (Ha, 2010b). In the the complexes are arranged in a V-shaped packing pattern along the c axis and linked by intermolecular C—H···O contacts into one-dimensional supramolecular chains (Table 2 and Fig. 2). There are also numerous intermolecularFor the crystal structures of [PtCl2(acr)2] (acr = acridine) and [PtCl(pic)(DMSO)] (pic = pyridine-2-carboxylate, DMSO = dimethyl sulfoxide), see: Ha (2010a,b).
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).[PtI2(C13H9N)(C2H6OS)] | F(000) = 1280 |
Mr = 706.23 | Dx = 2.577 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 5088 reflections |
a = 8.4800 (6) Å | θ = 2.6–26.0° |
b = 23.8181 (17) Å | µ = 11.21 mm−1 |
c = 9.9036 (7) Å | T = 200 K |
β = 114.492 (1)° | Block, yellow |
V = 1820.3 (2) Å3 | 0.20 × 0.19 × 0.06 mm |
Z = 4 |
Bruker SMART 1000 CCD diffractometer | 3573 independent reflections |
Radiation source: fine-focus sealed tube | 2809 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.051 |
φ and ω scans | θmax = 26.0°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | h = −10→7 |
Tmin = 0.468, Tmax = 1.000 | k = −28→29 |
11217 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)] = 0.035 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.083 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0324P)2] where P = (Fo2 + 2Fc2)/3 |
3573 reflections | (Δ/σ)max < 0.001 |
192 parameters | Δρmax = 2.10 e Å−3 |
0 restraints | Δρmin = −1.16 e Å−3 |
[PtI2(C13H9N)(C2H6OS)] | V = 1820.3 (2) Å3 |
Mr = 706.23 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.4800 (6) Å | µ = 11.21 mm−1 |
b = 23.8181 (17) Å | T = 200 K |
c = 9.9036 (7) Å | 0.20 × 0.19 × 0.06 mm |
β = 114.492 (1)° |
Bruker SMART 1000 CCD diffractometer | 3573 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2000) | 2809 reflections with I > 2σ(I) |
Tmin = 0.468, Tmax = 1.000 | Rint = 0.051 |
11217 measured reflections |
R[F2 > 2σ(F2)] = 0.035 | 0 restraints |
wR(F2) = 0.083 | H-atom parameters constrained |
S = 1.03 | Δρmax = 2.10 e Å−3 |
3573 reflections | Δρmin = −1.16 e Å−3 |
192 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 | 0.22004 (4) | 0.152591 (13) | 0.21512 (3) | 0.02504 (11) | |
I1 | 0.44358 (8) | 0.19167 (3) | 0.12073 (8) | 0.04961 (19) | |
I2 | 0.02342 (7) | 0.10938 (2) | 0.33373 (6) | 0.03254 (15) | |
S1 | 0.0408 (2) | 0.22130 (9) | 0.0922 (2) | 0.0282 (4) | |
O1 | −0.0003 (7) | 0.2220 (3) | −0.0675 (6) | 0.0410 (15) | |
N1 | 0.3965 (8) | 0.0876 (3) | 0.3075 (7) | 0.0282 (15) | |
C1 | 0.5309 (9) | 0.0945 (3) | 0.4428 (8) | 0.0247 (17) | |
C2 | 0.5382 (11) | 0.1408 (4) | 0.5345 (9) | 0.036 (2) | |
H2 | 0.4474 | 0.1678 | 0.5020 | 0.043* | |
C3 | 0.6736 (11) | 0.1471 (4) | 0.6683 (10) | 0.039 (2) | |
H3 | 0.6754 | 0.1780 | 0.7295 | 0.047* | |
C4 | 0.8130 (11) | 0.1081 (4) | 0.7186 (10) | 0.046 (3) | |
H4 | 0.9081 | 0.1136 | 0.8118 | 0.056* | |
C5 | 0.8103 (10) | 0.0635 (4) | 0.6344 (10) | 0.042 (2) | |
H5 | 0.9044 | 0.0378 | 0.6686 | 0.050* | |
C6 | 0.6695 (10) | 0.0543 (4) | 0.4955 (9) | 0.034 (2) | |
C7 | 0.6615 (10) | 0.0093 (4) | 0.4048 (10) | 0.039 (2) | |
H7 | 0.7548 | −0.0167 | 0.4367 | 0.047* | |
C8 | 0.5221 (10) | 0.0007 (3) | 0.2686 (9) | 0.0313 (19) | |
C9 | 0.5072 (11) | −0.0455 (4) | 0.1740 (11) | 0.042 (2) | |
H9 | 0.5958 | −0.0732 | 0.2045 | 0.050* | |
C10 | 0.3711 (12) | −0.0513 (4) | 0.0421 (10) | 0.045 (2) | |
H10 | 0.3649 | −0.0821 | −0.0207 | 0.054* | |
C11 | 0.2376 (11) | −0.0108 (4) | −0.0020 (9) | 0.037 (2) | |
H11 | 0.1403 | −0.0152 | −0.0943 | 0.044* | |
C12 | 0.2453 (10) | 0.0344 (4) | 0.0852 (9) | 0.035 (2) | |
H12 | 0.1538 | 0.0610 | 0.0529 | 0.042* | |
C13 | 0.3888 (10) | 0.0418 (3) | 0.2234 (9) | 0.0296 (18) | |
C14 | 0.1268 (10) | 0.2874 (4) | 0.1699 (9) | 0.036 (2) | |
H14A | 0.2394 | 0.2928 | 0.1661 | 0.055* | |
H14B | 0.1415 | 0.2887 | 0.2734 | 0.055* | |
H14C | 0.0471 | 0.3172 | 0.1134 | 0.055* | |
C15 | −0.1582 (10) | 0.2226 (4) | 0.1040 (9) | 0.038 (2) | |
H15A | −0.2275 | 0.2540 | 0.0453 | 0.057* | |
H15B | −0.1395 | 0.2272 | 0.2079 | 0.057* | |
H15C | −0.2197 | 0.1872 | 0.0655 | 0.057* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Pt1 | 0.02442 (17) | 0.0238 (2) | 0.02705 (18) | 0.00111 (12) | 0.01078 (13) | 0.00131 (13) |
I1 | 0.0400 (4) | 0.0479 (4) | 0.0741 (5) | 0.0065 (3) | 0.0368 (3) | 0.0194 (3) |
I2 | 0.0375 (3) | 0.0295 (3) | 0.0353 (3) | −0.0020 (2) | 0.0198 (2) | 0.0003 (2) |
S1 | 0.0316 (11) | 0.0290 (12) | 0.0239 (10) | 0.0046 (8) | 0.0113 (8) | 0.0022 (8) |
O1 | 0.050 (4) | 0.052 (4) | 0.020 (3) | 0.011 (3) | 0.014 (3) | 0.005 (3) |
N1 | 0.028 (4) | 0.019 (4) | 0.039 (4) | 0.000 (3) | 0.015 (3) | 0.003 (3) |
C1 | 0.017 (4) | 0.021 (5) | 0.029 (4) | 0.002 (3) | 0.002 (3) | 0.009 (3) |
C2 | 0.039 (5) | 0.028 (5) | 0.035 (5) | 0.000 (4) | 0.009 (4) | 0.006 (4) |
C3 | 0.042 (5) | 0.034 (6) | 0.032 (5) | −0.011 (4) | 0.007 (4) | 0.004 (4) |
C4 | 0.035 (5) | 0.054 (7) | 0.033 (5) | −0.012 (5) | −0.003 (4) | 0.013 (5) |
C5 | 0.027 (5) | 0.047 (7) | 0.040 (5) | −0.001 (4) | 0.002 (4) | 0.013 (5) |
C6 | 0.031 (5) | 0.037 (6) | 0.037 (5) | −0.005 (4) | 0.016 (4) | 0.008 (4) |
C7 | 0.034 (5) | 0.033 (6) | 0.053 (6) | 0.009 (4) | 0.020 (4) | 0.016 (4) |
C8 | 0.028 (4) | 0.021 (5) | 0.048 (5) | 0.000 (3) | 0.018 (4) | 0.008 (4) |
C9 | 0.047 (6) | 0.028 (6) | 0.062 (6) | 0.004 (4) | 0.034 (5) | 0.006 (5) |
C10 | 0.070 (7) | 0.027 (6) | 0.051 (6) | −0.008 (5) | 0.037 (5) | −0.013 (4) |
C11 | 0.036 (5) | 0.037 (6) | 0.033 (5) | −0.003 (4) | 0.011 (4) | −0.002 (4) |
C12 | 0.035 (5) | 0.028 (5) | 0.042 (5) | −0.001 (4) | 0.015 (4) | 0.001 (4) |
C13 | 0.035 (5) | 0.024 (5) | 0.035 (5) | 0.007 (4) | 0.020 (4) | 0.006 (4) |
C14 | 0.042 (5) | 0.029 (6) | 0.035 (5) | 0.002 (4) | 0.013 (4) | 0.003 (4) |
C15 | 0.031 (5) | 0.034 (6) | 0.043 (5) | 0.006 (4) | 0.009 (4) | 0.006 (4) |
Pt1—N1 | 2.083 (6) | C6—C7 | 1.381 (12) |
Pt1—S1 | 2.222 (2) | C7—C8 | 1.392 (11) |
Pt1—I1 | 2.6082 (6) | C7—H7 | 0.9500 |
Pt1—I2 | 2.6160 (6) | C8—C9 | 1.417 (12) |
S1—O1 | 1.472 (5) | C8—C13 | 1.420 (10) |
S1—C15 | 1.740 (8) | C9—C10 | 1.344 (13) |
S1—C14 | 1.771 (9) | C9—H9 | 0.9500 |
N1—C13 | 1.358 (10) | C10—C11 | 1.410 (12) |
N1—C1 | 1.362 (9) | C10—H10 | 0.9500 |
C1—C2 | 1.414 (11) | C11—C12 | 1.364 (11) |
C1—C6 | 1.435 (11) | C11—H11 | 0.9500 |
C2—C3 | 1.355 (11) | C12—C13 | 1.415 (11) |
C2—H2 | 0.9500 | C12—H12 | 0.9500 |
C3—C4 | 1.420 (12) | C14—H14A | 0.9800 |
C3—H3 | 0.9500 | C14—H14B | 0.9800 |
C4—C5 | 1.345 (13) | C14—H14C | 0.9800 |
C4—H4 | 0.9500 | C15—H15A | 0.9800 |
C5—C6 | 1.416 (11) | C15—H15B | 0.9800 |
C5—H5 | 0.9500 | C15—H15C | 0.9800 |
N1—Pt1—S1 | 172.71 (17) | C6—C7—C8 | 122.5 (8) |
N1—Pt1—I1 | 85.75 (16) | C6—C7—H7 | 118.7 |
S1—Pt1—I1 | 88.55 (5) | C8—C7—H7 | 118.7 |
N1—Pt1—I2 | 89.21 (16) | C7—C8—C9 | 124.3 (8) |
S1—Pt1—I2 | 96.73 (5) | C7—C8—C13 | 116.7 (8) |
I1—Pt1—I2 | 174.03 (2) | C9—C8—C13 | 119.0 (8) |
O1—S1—C15 | 105.5 (4) | C10—C9—C8 | 121.8 (8) |
O1—S1—C14 | 109.1 (4) | C10—C9—H9 | 119.1 |
C15—S1—C14 | 101.0 (4) | C8—C9—H9 | 119.1 |
O1—S1—Pt1 | 113.6 (3) | C9—C10—C11 | 119.1 (8) |
C15—S1—Pt1 | 116.0 (3) | C9—C10—H10 | 120.4 |
C14—S1—Pt1 | 110.6 (3) | C11—C10—H10 | 120.4 |
C13—N1—C1 | 120.5 (7) | C12—C11—C10 | 121.4 (8) |
C13—N1—Pt1 | 119.0 (5) | C12—C11—H11 | 119.3 |
C1—N1—Pt1 | 119.9 (5) | C10—C11—H11 | 119.3 |
N1—C1—C2 | 121.4 (7) | C11—C12—C13 | 120.4 (8) |
N1—C1—C6 | 120.2 (7) | C11—C12—H12 | 119.8 |
C2—C1—C6 | 118.4 (7) | C13—C12—H12 | 119.8 |
C3—C2—C1 | 120.5 (8) | N1—C13—C12 | 119.8 (7) |
C3—C2—H2 | 119.7 | N1—C13—C8 | 122.0 (7) |
C1—C2—H2 | 119.7 | C12—C13—C8 | 118.2 (8) |
C2—C3—C4 | 121.0 (9) | S1—C14—H14A | 109.5 |
C2—C3—H3 | 119.5 | S1—C14—H14B | 109.5 |
C4—C3—H3 | 119.5 | H14A—C14—H14B | 109.5 |
C5—C4—C3 | 120.0 (8) | S1—C14—H14C | 109.5 |
C5—C4—H4 | 120.0 | H14A—C14—H14C | 109.5 |
C3—C4—H4 | 120.0 | H14B—C14—H14C | 109.5 |
C4—C5—C6 | 121.1 (8) | S1—C15—H15A | 109.5 |
C4—C5—H5 | 119.5 | S1—C15—H15B | 109.5 |
C6—C5—H5 | 119.5 | H15A—C15—H15B | 109.5 |
C7—C6—C5 | 123.1 (8) | S1—C15—H15C | 109.5 |
C7—C6—C1 | 117.9 (7) | H15A—C15—H15C | 109.5 |
C5—C6—C1 | 118.9 (8) | H15B—C15—H15C | 109.5 |
I1—Pt1—S1—O1 | 57.2 (3) | C2—C1—C6—C7 | −179.7 (7) |
I2—Pt1—S1—O1 | −125.6 (3) | N1—C1—C6—C5 | 177.9 (7) |
I1—Pt1—S1—C15 | 179.8 (3) | C2—C1—C6—C5 | −2.1 (11) |
I2—Pt1—S1—C15 | −3.0 (3) | C5—C6—C7—C8 | 179.9 (8) |
I1—Pt1—S1—C14 | −65.9 (3) | C1—C6—C7—C8 | −2.6 (12) |
I2—Pt1—S1—C14 | 111.3 (3) | C6—C7—C8—C9 | −178.6 (7) |
I1—Pt1—N1—C13 | −87.4 (5) | C6—C7—C8—C13 | 2.2 (12) |
I2—Pt1—N1—C13 | 95.8 (5) | C7—C8—C9—C10 | −178.7 (8) |
I1—Pt1—N1—C1 | 84.1 (5) | C13—C8—C9—C10 | 0.6 (12) |
I2—Pt1—N1—C1 | −92.8 (5) | C8—C9—C10—C11 | −1.4 (13) |
C13—N1—C1—C2 | −177.6 (7) | C9—C10—C11—C12 | 1.2 (13) |
Pt1—N1—C1—C2 | 11.0 (9) | C10—C11—C12—C13 | −0.1 (13) |
C13—N1—C1—C6 | 2.4 (11) | C1—N1—C13—C12 | 178.0 (7) |
Pt1—N1—C1—C6 | −169.0 (5) | Pt1—N1—C13—C12 | −10.6 (9) |
N1—C1—C2—C3 | −179.6 (7) | C1—N1—C13—C8 | −2.9 (11) |
C6—C1—C2—C3 | 0.4 (12) | Pt1—N1—C13—C8 | 168.6 (6) |
C1—C2—C3—C4 | 1.3 (13) | C11—C12—C13—N1 | 178.5 (7) |
C2—C3—C4—C5 | −1.3 (14) | C11—C12—C13—C8 | −0.7 (12) |
C3—C4—C5—C6 | −0.4 (13) | C7—C8—C13—N1 | 0.6 (11) |
C4—C5—C6—C7 | 179.6 (8) | C9—C8—C13—N1 | −178.7 (7) |
C4—C5—C6—C1 | 2.1 (12) | C7—C8—C13—C12 | 179.8 (7) |
N1—C1—C6—C7 | 0.3 (11) | C9—C8—C13—C12 | 0.5 (11) |
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14B···O1i | 0.98 | 2.36 | 3.209 (10) | 145 |
C15—H15B···O1i | 0.98 | 2.37 | 3.241 (10) | 147 |
Symmetry code: (i) x, −y+1/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | [PtI2(C13H9N)(C2H6OS)] |
Mr | 706.23 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 200 |
a, b, c (Å) | 8.4800 (6), 23.8181 (17), 9.9036 (7) |
β (°) | 114.492 (1) |
V (Å3) | 1820.3 (2) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 11.21 |
Crystal size (mm) | 0.20 × 0.19 × 0.06 |
Data collection | |
Diffractometer | Bruker SMART 1000 CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2000) |
Tmin, Tmax | 0.468, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11217, 3573, 2809 |
Rint | 0.051 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.035, 0.083, 1.03 |
No. of reflections | 3573 |
No. of parameters | 192 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 2.10, −1.16 |
Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14B···O1i | 0.98 | 2.36 | 3.209 (10) | 144.7 |
C15—H15B···O1i | 0.98 | 2.37 | 3.241 (10) | 147.4 |
Symmetry code: (i) x, −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 (2009–0094056).
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Single crystals of the title complex, [PtI2(C13H9N)(C2H6OS)] (where C13H9N is acridine (acr) and C2H6OS is dimethyl sulfoxide (DMSO)), were unexpectedly obtained from a DMSO solution of the dark-yellow reaction product [PtI2(acr)2] held at 353 K. It seems that an acridine ligand of the complex [PtI2(acr)2] was replaced by a DMSO molecule during crystallization, whereas the analogous Pt complex [PtCl2(acr)2] crystallized without substitution in a DMSO solution at 353 K (Ha, 2010a). In the title complex, the PtII atom is four-coordinated in an essentially square-planar environment defined by the N atom of the acridine ligand, the S atom of the dimethyl sulfoxide molecule and two iodide ions (Table 1 and Fig. 1). The dihedral angle between the nearly planar PtI2NS moiety and acridine ligand is 89.29 (7)°. The I atoms are in trans conformation with respect to each other (<I1—Pt1—I2 = 174.03 (2)°) and almost perpendicular to the acridine ligand, with N1—Pt1—I1/2 bond angles of 85.75 (16)° and 89.21 (16)°. The Pt—S bond length (2.222 (2) Å) is comparable to those observed in the Pt-DMSO complex [PtCl(pic)(DMSO)] (2.202 (2) Å, where pic is pyridine-2-carboxylate (Ha, 2010b). In the crystal structure, the complexes are arranged in a V-shaped packing pattern along the c axis and linked by intermolecular C—H···O contacts into one-dimensional supramolecular chains (Table 2 and Fig. 2). There are also numerous intermolecular π-π interactions between six-membered rings, with the shortest ring centroid-centroid distance being 3.804 (5) Å.