The crystal structure of ((cyclo­hexyl­amino){(Z)-2-[(E)-5-meth­oxy-3-nitro-2-oxido­benzyl­idene-κO]hydrazin-1-yl­idene-κN2}methane­thiol­ato-κS)(dimethyl sulfoxide-κS)platinum(II): a supra­molecular two-dimensional network

Arafath, M.A.; Kwong, H.C.; Adam, F.

doi:10.1107/S2056989019012623

research communications

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ISSN: 2056-9890

Volume 75| Part 10| October 2019| Pages 1486-1489

https://doi.org/10.1107/S2056989019012623

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The crystal structure of ((cyclohexylamino){(Z)-2-[(E)-5-methoxy-3-nitro-2-oxidobenzylidene-κO]hydrazin-1-ylidene-κN²}methanethiolato-κS)(dimethyl sulfoxide-κS)platinum(II): a supramolecular two-dimensional network

Md. Azharul Arafath,^a ^* Huey Chong Kwong ^b and Farook Adam ^b

^aDepartment of Chemistry, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh, and ^bSchool of Chemical Sciences, Universiti Sains Malaysia, Penang 11800 USM, Malaysia
^*Correspondence e-mail: arafath.usm@gmail.com

Edited by H. Stoeckli-Evans, University of Neuchâtel, Switzerland (Received 26 August 2019; accepted 10 September 2019; online 12 September 2019)

The Pt^II atom in the title complex, [Pt(C₁₅H₁₈N₄O₄S)(C₂H₆OS)], exists within a square-planar NS₂O donor set provided by the N, S, O atoms of the di-anionic tridentate thiosemicarbazo ligand and a dimethyl sulfoxide S atom. The two chelate rings are coplanar, subtending a dihedral angle of 1.51 (7)°. The maximum deviation from an ideal square-planar geometry is seen in the five-membered chelate ring with an S—Pt—S bite angle of 96.45 (2)°. In the crystal, molecules are linked via N—H⋯O, C—H⋯O, C—H⋯N and C—H⋯π interactions into two-dimensional networks lying parallel to the ab plane. The conformations of related cyclohexylhydrazine-1-carbothioamide ligands are compared to that of the title compound.

Keywords: crystal structure; cyclohexylhydrazinecarbothioamide; soft Lewis base; carbothioamide Schiff base; hydrogen bonding; C—H⋯π interactions.

CCDC reference: 1524712

1. Chemical context

Schiff base ligands and their complexes with transitional metals form an important functionality in medicinal, industrial and coordination chemistry (Hanifehpour et al., 2015 ; Singh et al., 2007 ). Cisplatin was synthesized by Peyrone in 1844 (Peyrone, 1844 ), and its use for treatment against human cancer was authorized in 1978, the biological effects of this compound on cancer cells having been discovered serendipitously by Rosenberg and co-workers in 1965 (Rosenburg et al., 1965 ). Work by medicinal chemists on the coordination and biological properties of metal complexes has contributed to the emergence of modern medicinal chemistry, which was inspired by the discovery of cisplatin. The thiosemicarbazone moiety containing Schiff base ligands chelated to platinum(II) shows high antitumor and anticancer activity; metal-based drugs are more promising and convenient as therapeutic agents (Nomiya et al., 1998 ; Kovala-Demertzi et al., 2003 ; Kovala-Demertzi et al., 2000 ; Anacona et al., 1999 ; Arafath et al., 2017b ). The complexes of Pt^II with 4(N)-substituted derivatives of 2-acetylpyridine thiosemicarbazone exhibit potential antitumor, anticancer, antibacterial, antineoplastic and cytogenetic activities (Kovala-Demertzi et al., 1999 , 2000, 2001 ). Carbazate containing N- and S-coordinating sites chelated to Pt^II exhibits potential antibacterial and anticancer activity (Tarafder et al., 2002 ; Arafath et al., 2019 ). Herein we describe the synthesis and crystal structure of one such complex, ((cyclohexylamino){(Z)-2-[(E)-5-methoxy-3-nitro-2-oxidobenzylidene-κO]hydrazin-1-ylidene-κN²}methanethiolato-κS)(dimethyl sulfoxide-κS)platinum(II), I.

2. Structural commentary

The molecular structure of complex I is shown in Fig. 1. Selected geometrical parameters involving atom Pt1 are given in Table 1. The Pt^II atom is four-coordinate, creating a square-planar PtNOS₂ environment with a maximum deviation of 0.0105 (2) Å for atom N2. The coordination environment consists of a thiosemicarbazone and a dimethyl sulfoxide molecule. The thiosemicarbazone molecule coordinates in a tridentate manner through thioamide sulfur atom S1, azomethine nitrogen N2 and phenyl oxygen O1, creating two chelate rings which are coplanar; the dihedral angle between the mean planes of the five-membered Pt1/S1/N2/N3/C9 and six-membered Pt1/O1/N2/C1/C6/C8 chelate rings is 1.51 (7)°. The benzene ring (C1–C6) is almost coplanar with both chelate rings, making dihedral angles of 2.82 (9) and 1.36 (10)°, respectively. The bite angles formed between the thiosemicarbazone ligand and the metal are N2—Pt1—S1 = 84.74 (5)° and O1—Pt1—N2 = 93.95 (6)°. The angles formed between the thiosemicarbazone, metal and the dimethyl sulfoxide are O1—Pt1—S2 = 84.87 (5)° and S1—Pt1—S2 = 96.45 (2)°. As a result of chelation, the two azomethine C=N double bonds, N2=C8 and N3=C9, are in Z and E configurations, respectively. This leads to both azomethine double bonds adopting a s-trans conformation with respect to each other. The cyclohexane ring adopts a chair conformation with puckering amplitude Q = 0.567 (3) Å, θ = 175.9 (3)° and φ = 160 (5)°, and forms a torsion angle (C9—N4—C10—C11) of 162.2 (2)° to the Pt1/S1/N2/N3/C9 chelate ring. In the 5-methoxy-3-nitro-2-oxidobenzyl ring, the methoxy and nitro groups are almost coplanar with the benzene ring, as indicated by the torsion angles O2—N1—C2—C1 = 4.0 (4)° and C7—O4—C4—C3 = 4.7 (4)°. Oxygen atom O5 of the dimethyl sulfoxide molecule is almost coplanar with both chelate rings [O5—S2—Pt1—S1 = 1.83 (11)°], whereas the methyl groups are twisted with respect to the chelate ring [C16—S2—Pt1—S1 =123.64 (11) and C17—S2—Pt1—S1 = −127.60 (12) °]. In the molecule, atom O2 of the nitro group acts as a hydrogen-bond acceptor for the adjacent methyl group, forming an intramolecular C—H⋯O hydrogen bond with an S(9) ring motif (Fig. 1, Table 2).

Table 1
Selected geometric parameters (Å, °)

Pt1—N2	1.9936 (17)	Pt1—S2	2.2254 (5)
Pt1—O1	2.0201 (15)	Pt1—S1	2.2441 (5)

N2—Pt1—O1	93.95 (6)	N2—Pt1—S1	84.74 (5)
N2—Pt1—S2	178.65 (5)	O1—Pt1—S1	178.63 (5)
O1—Pt1—S2	84.87 (5)	S2—Pt1—S1	96.45 (2)

Table 2
Hydrogen-bond geometry (Å, °)

Cg1 is the centroid of chelate ring Pt1/S1/N2/N3/C9.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C17—H17A⋯O2	0.96	2.53	3.438 (4)	157
N4—H1N4⋯O5ⁱ	0.83 (3)	2.21 (3)	3.042 (2)	174 (2)
C17—H17B⋯N3ⁱⁱ	0.96	2.46	3.336 (3)	152
C17—H17C⋯O3ⁱⁱⁱ	0.96	2.54	3.354 (4)	143
C12—H12A⋯Cg1ⁱⁱⁱ	0.97	2.95	3.669 (3)	131
Symmetry codes: (i) x, y-1, z; (ii) x, y+1, z; (iii) x-1, y, z.

Figure 1
The molecular structure of complex I, with atom labelling and displacement ellipsoids drawn at the 50% probability level.

3. Supramolecular features

In the crystal of I, molecules are linked by N4—H1N4⋯O5ⁱ and C17—H17⋯N3ⁱⁱ hydrogen bonds, enclosing an R₂²(8) ring motif and forming chains propagating along the b-axis direction (Fig. 2, Table 2). The chains are interconnected via C17—H17C⋯O3ⁱⁱⁱ hydrogen bonds, forming a two-dimensional network parallel to the ab plane (Fig. 3). These chains are further stabilized by C12—H12A⋯Cg1ⁱⁱⁱ interactions, where Cg1 is the centroid of the Pt1/S1/N2/N3/C9 chelate ring (Fig. 3, Table 2). In addition, short intermolecular O3⋯C7(−x + 3, −y + 1, −z) contacts of 2.897 (4) Å are observed; these are ∼0.32 Å shorter than the sum of van der Waals radii of carbon and oxygen atoms.

Figure 2
A view of the hydrogen-bonded chain formed by N—H⋯O and C—H⋯N hydrogen bonds [dashed lines; symmetry code: (i) x, y − 1, z]. Hydrogen atoms not involved in these interactions have been omitted for clarity.

Figure 3
A view along the c axis of the crystal packing of complex I. The hydrogen bonds are shown as dashed lines and the C—H⋯π interactions are represented as dashed blue arrows (Table 1

). Hydrogen atoms not involved in these interactions have been omitted for clarity.

4. Database survey

A search of the Cambridge Structural Database (CSD version 5.40, last update May 2019; Groom et al., 2016 ) using (E)-2-(2-(λ¹-oxidanyl)benzylidene)-N-cyclohexylhydrazine-1-carbothioamide as the reference skeleton resulted in five related ligands containing cyclohexylhydrazine-1-carbothioamide with different substituents. They include (E)-2-(R₁)-N-cyclohexylhydrazine-1-carbothioamide, where R₁ = (2-hydronaphthalen-1-yl)methylene (BEFZIY; Basheer et al., 2016 ), 5-bromo-2-hydroxy-3-methoxybenzylidene (LAQCIR; Jacob & Kurup, 2012 ), 4-(benzyloxy)-2-hydroxybenzylidene (MOKPOT; Sajitha et al., 2014 ), 5-chloro-2-hydroxybenzylidene (OBOLOJ; Arafath et al., 2017a ), and 3-(tert-butyl)-2-hydroxybenzylidene (YUXJOS; Arafath et al., 2018 ). Selected geometrical parameters of I and the related structures are given in Table 3. As the ligand molecule in I is chelated to platinum, it exists in a different tautomeric form. In I, the O1—C1 and S1—C9 bond lengths of 1.297 (3) and 1.745 (2) Å, respectively, are different from those in related ligands [O1—C1 and S1—C9 bond lengths in the ranges 1.350–1.362 and 1.683–1.693 Å, respectively]. As a chelating effect, the formation of the N3=C9 azomethine double bond is confirmed by its length [1.320 (3) Å], compared to 1.342–1.364 Å in related ligands. A decrease of the N2—N3—C9 angle is observed [119.03–121.82° compared to 113.79 (17)° in I]. Furthermore, the N2—N3—C9—N4 torsion angle in I has an antiperiplanar [−178.3 (2)°] conformation, whereas this torsion angle is in a synperiplanar [4.08–12.51°] conformation in the related ligands

Table 3
Selected geometrical parameters for I and related ligands (Å, °)

	I	BEFZIY	LAQCIR	MOKPOT^a	OBOLOJ	YUXJOS
Pt1—O1	2.0201 (15)	–	–	–	–	–
Pt1—N2	1.9936 (17)	–	–	–	–	–
Pt1—S1	2.2441 (5)	–	–	–	–	–
Pt1—S2	2.2254 (5)	–	–	–	–	–
O1—C1	1.297 (3)	1.352	1.350	1.355, 1.350	1.360	1.362
S1—C9	1.745 (2)	1.693	1.685	1.683, 1.683	1.688	1.691
C6—C8	1.438 (3)	1.488	1.448	1.443, 1.448	1.459	1.457
C8—N2	1.300 (3)	1.294	1.268	1.281, 1.278	1.279	1.287
N2—N3	1.377 (2)	1.373	1.363	1.380, 1.379	1.369	1.388
N3—C9	1.320 (3)	1.354	1.342	1.346, 1.343	1.364	1.357
N4—C9	1.343 (3)	1.335	1.308	1.319, 1.323	1.325	1.336
N4—C10	1.460 (3)	1.467	1.455	1.464, 1.455	1.465	1.466
N2—N3—C9	113.79 (17)	121.82	120.90	121.70, 120.82	121.03	119.03
N3—C9—N4	116.41 (19)	117.02	116.60	117.35, 117.16	115.84	116.29
N2—N3—C9—N4	−178.3 (2)	−6.83	4.08	−6.04, 5.25	−5.50	12.51
Note: (a) MOKPOT crystallized with two independent molecules in the asymmetric unit.

5. Synthesis and crystallization

The reaction scheme for the synthesis of complex I is given in Fig. 4. The ligand (E)-N-cyclohexyl-2-(2-hydroxy-5-methoxy-3-nitrobenzylidene)hydrazine-1-carbothioamide (0.71 g, 2.00 mmol) was dissolved in 20 ml of methanol. A 2 mmol solution of NaOH in 10 ml of methanol was added and the mixture was refluxed for 30 min. A solution of K₂PtCl₄ (0.83 g, 2.00 mmol) was dissolved in 2 ml of DMSO and refluxed for 30 min. The resulting platinum(II) solution was added dropwise under stirring to the ligand solution under an Ar atmosphere and refluxed for 24 h. The reddish-orange precipitate that formed was filtered off and washed with ethanol, ethyl acetate and n-hexane. It was then dissolved in chloroform and acetonitrile (1:1) for recrystallization. Orange block-like crystals suitable for X-ray diffraction analysis were obtained on slow evaporation of the solvents (yield 88%, m.p. 510–511 K).

Figure 4
Reaction scheme for the synthesis of the title complex.

Analysis for C₁₇H₂₄N₄O₅PtS₂ (FW: 623.61 g mol⁻¹); calculated C, 32.71; H, 3.84; N, 8.97%; found: C, 32.67; H,3.76; N, 8.97%. IR (KBr pellets, cm⁻¹): 3275 υ(NH), 3006 υ(CH₃), 2927 and 2852 υ(CH, cyclohexyl), 1582 υ(C=N), 1544 υ(C=C, aromatic), 1220 υ(C—S), 439 υ(Pt—N). ¹H NMR (500 MHz, DMSO-d₆, Me₄Si ppm): δ 8.56 (s, HC=N), δ 7.60 (d, J = 7.55 Hz, CS—NH), δ 7.73 (s, H-aromatic), δ 7.70 (s, H-aromatic), δ 3.77 (s, Ph—OCH₃), δ 2.54 [s, S(CH₃)₂], δ 1.92–1.12 (multiplet, N—C₆H₁₁). ¹³C NMR (125 MHz, DMSO-d₆) δ 170.35 (C—S), δ 147.36 (C=N), δ 146.93–115.66 (C-aromatic), δ 56.14 (OCH₃), δ 54.69 (N—C, cyclohexyl), δ 40.42 [S(CH₃)₂], δ 32.44–24.75 (N—C₆H₁₁) ppm.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 4. The N-bound H atom was located in a difference-Fourier map and freely refined. The C-bound H atoms were positioned geometrically (C—H = 0.93–0.98 Å) and refined using a riding model with U_iso(H) = 1.5U_eq(C–methyl) and 1.2U_eq(C) for other C-bound H atoms.

Table 4
Experimental details

Crystal data
Chemical formula	[Pt(C₁₅H₁₈N₄O₄S)(C₂H₆OS)]
M_r	623.61
Crystal system, space group	Triclinic, P $[\overline{1}]$
Temperature (K)	296
a, b, c (Å)	6.5264 (3), 8.9024 (3), 18.9261 (7)
α, β, γ (°)	82.228 (1), 87.074 (1), 74.739 (1)
V (Å³)	1050.96 (7)
Z	2
Radiation type	Mo Kα
μ (mm⁻¹)	6.91
Crystal size (mm)	0.49 × 0.21 × 0.15

Data collection
Diffractometer	Bruker APEX Duo CCD area detector
Absorption correction	Multi-scan (SADABS; Bruker, 2012 )
T_min, T_max	0.039, 0.092
No. of measured, independent and observed [I > 2σ(I)] reflections	41144, 6285, 5899
R_int	0.030
(sin θ/λ)_max (Å⁻¹)	0.711

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.019, 0.042, 1.09
No. of reflections	6285
No. of parameters	269
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.98, −0.80
Computer programs: APEX2 and SAINT (Bruker, 2012), SHELXS97 (Sheldrick, 2008 ), Mercury (Macrae et al., 2008 ), SHELXL2013 (Sheldrick, 2015 ) and PLATON (Spek, 2009 ).

Supporting information

CCDC reference: 1524712

Crystal structure: contains datablocks I, Global. DOI: https://doi.org/10.1107/S2056989019012623/su5513sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989019012623/su5513Isup2.hkl

checkCIF report

Computing details top

Data collection: APEX2 (Bruker, 2012); cell refinement: SAINT (Bruker, 2012); data reduction: SAINT (Bruker, 2012); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2015); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL2013 (Sheldrick, 2015) and PLATON (Spek, 2009).

((Cyclohexylamino){(Z)-2-[(E)-5-methoxy-3-nitro-2-oxidobenzylidene-κO]hydrazin-1-ylidene-κN²}methanethiolato-κS)(dimethyl sulfoxide-κS)platinum(II) top

Crystal data top

[Pt(C₁₅H₁₈N₄O₄S)(C₂H₆OS)]	Z = 2
M_r = 623.61	F(000) = 608
Triclinic, P1	D_x = 1.971 Mg m⁻³
a = 6.5264 (3) Å	Mo Kα radiation, λ = 0.71073 Å
b = 8.9024 (3) Å	Cell parameters from 9889 reflections
c = 18.9261 (7) Å	θ = 2.4–30.2°
α = 82.228 (1)°	µ = 6.91 mm⁻¹
β = 87.074 (1)°	T = 296 K
γ = 74.739 (1)°	Block, orange
V = 1050.96 (7) Å³	0.49 × 0.21 × 0.14 mm

Data collection top

Bruker APEX Duo CCD area detector diffractometer	6285 independent reflections
Radiation source: fine-focus sealed tube	5899 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.030
φ and ω scans	θ_max = 30.4°, θ_min = 2.2°
Absorption correction: multi-scan (SADABS; Bruker, 2012)	h = −9→9
T_min = 0.039, T_max = 0.092	k = −12→12
41144 measured reflections	l = −26→26

Refinement top

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)] = 0.019	Hydrogen site location: mixed
wR(F²) = 0.042	H atoms treated by a mixture of independent and constrained refinement
S = 1.09	w = 1/[σ²(F_o²) + (0.0179P)² + 0.4664P] where P = (F_o² + 2F_c²)/3
6285 reflections	(Δ/σ)_max = 0.001
269 parameters	Δρ_max = 0.98 e Å⁻³
0 restraints	Δρ_min = −0.80 e Å⁻³

Special details top

Experimental. The following wavelength and cell were deduced by SADABS from the direction cosines etc. They are given here for emergency use only: CELL 0.71080 6.582 8.984 19.105 82.236 87.079 74.752

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

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

	x	y	z	U_iso*/U_eq
Pt1	0.43753 (2)	0.56002 (2)	0.24360 (2)	0.02894 (3)
S1	0.16102 (9)	0.50827 (6)	0.30850 (3)	0.03473 (12)
S2	0.37664 (9)	0.80884 (6)	0.26345 (3)	0.03468 (12)
O1	0.6871 (3)	0.60194 (19)	0.18405 (10)	0.0390 (4)
O2	0.9041 (4)	0.8000 (3)	0.14108 (15)	0.0723 (7)
O3	1.1660 (4)	0.7358 (3)	0.07156 (15)	0.0768 (8)
O4	1.2756 (3)	0.1801 (2)	0.04000 (12)	0.0554 (5)
O5	0.1906 (3)	0.8775 (2)	0.30664 (12)	0.0536 (5)
N1	1.0219 (3)	0.7032 (3)	0.10813 (12)	0.0431 (5)
N2	0.4993 (3)	0.3368 (2)	0.22554 (9)	0.0269 (3)
N3	0.3775 (3)	0.2401 (2)	0.25670 (11)	0.0328 (4)
N4	0.0985 (3)	0.2204 (2)	0.33019 (12)	0.0383 (4)
C1	0.8250 (3)	0.5008 (3)	0.15095 (12)	0.0313 (4)
C2	0.9964 (4)	0.5447 (3)	0.11207 (12)	0.0343 (5)
C3	1.1483 (4)	0.4417 (3)	0.07519 (13)	0.0394 (5)
H3A	1.2590	0.4754	0.0510	0.047*
C4	1.1352 (4)	0.2910 (3)	0.07449 (13)	0.0393 (5)
C5	0.9686 (4)	0.2432 (3)	0.11050 (13)	0.0374 (5)
H5A	0.9582	0.1415	0.1088	0.045*
C6	0.8158 (3)	0.3422 (3)	0.14924 (12)	0.0315 (4)
C7	1.4562 (4)	0.2214 (4)	0.00674 (16)	0.0520 (7)
H7A	1.5477	0.1318	−0.0120	0.078*
H7B	1.5316	0.2554	0.0411	0.078*
H7C	1.4115	0.3049	−0.0314	0.078*
C8	0.6590 (4)	0.2725 (3)	0.18624 (12)	0.0328 (4)
H8A	0.6737	0.1675	0.1814	0.039*
C9	0.2195 (3)	0.3102 (2)	0.29690 (12)	0.0299 (4)
C10	−0.0798 (3)	0.2704 (3)	0.37886 (12)	0.0328 (4)
H10A	−0.1680	0.3725	0.3583	0.039*
C11	−0.2114 (4)	0.1513 (3)	0.38496 (14)	0.0409 (5)
H11A	−0.2592	0.1448	0.3380	0.049*
H11B	−0.1240	0.0486	0.4033	0.049*
C12	−0.4028 (4)	0.1967 (4)	0.43416 (17)	0.0567 (8)
H12A	−0.4989	0.2929	0.4127	0.068*
H12B	−0.4778	0.1151	0.4396	0.068*
C13	−0.3399 (5)	0.2203 (4)	0.50658 (17)	0.0617 (8)
H13A	−0.2629	0.1201	0.5312	0.074*
H13B	−0.4669	0.2597	0.5345	0.074*
C14	−0.2027 (6)	0.3343 (4)	0.50108 (18)	0.0669 (9)
H14A	−0.1554	0.3394	0.5482	0.080*
H14B	−0.2864	0.4382	0.4827	0.080*
C15	−0.0102 (4)	0.2858 (4)	0.45248 (15)	0.0479 (6)
H15A	0.0806	0.1863	0.4730	0.058*
H15B	0.0708	0.3637	0.4484	0.058*
C16	0.6081 (5)	0.8331 (3)	0.30079 (16)	0.0496 (6)
H16A	0.7288	0.7960	0.2707	0.074*
H16B	0.6294	0.7741	0.3474	0.074*
H16C	0.5912	0.9422	0.3044	0.074*
C17	0.3707 (5)	0.9254 (3)	0.17999 (14)	0.0443 (6)
H17A	0.5041	0.8925	0.1554	0.066*
H17B	0.3461	1.0336	0.1871	0.066*
H17C	0.2585	0.9137	0.1520	0.066*
H1N4	0.133 (4)	0.127 (3)	0.3226 (15)	0.040 (7)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Pt1	0.03200 (4)	0.02243 (4)	0.03352 (5)	−0.00897 (3)	0.00631 (3)	−0.00618 (3)
S1	0.0360 (3)	0.0249 (2)	0.0439 (3)	−0.0090 (2)	0.0134 (2)	−0.0097 (2)
S2	0.0416 (3)	0.0244 (2)	0.0400 (3)	−0.0110 (2)	0.0086 (2)	−0.0094 (2)
O1	0.0397 (8)	0.0291 (8)	0.0510 (10)	−0.0137 (7)	0.0176 (7)	−0.0124 (7)
O2	0.0736 (15)	0.0459 (12)	0.107 (2)	−0.0319 (11)	0.0442 (14)	−0.0266 (12)
O3	0.0810 (16)	0.0737 (16)	0.0964 (19)	−0.0557 (14)	0.0474 (14)	−0.0303 (14)
O4	0.0482 (10)	0.0501 (11)	0.0665 (13)	−0.0118 (9)	0.0308 (9)	−0.0156 (10)
O5	0.0570 (11)	0.0342 (9)	0.0715 (14)	−0.0137 (8)	0.0292 (10)	−0.0213 (9)
N1	0.0440 (11)	0.0474 (12)	0.0446 (12)	−0.0246 (10)	0.0084 (9)	−0.0073 (10)
N2	0.0295 (8)	0.0234 (8)	0.0285 (9)	−0.0088 (6)	0.0058 (7)	−0.0040 (7)
N3	0.0364 (9)	0.0257 (8)	0.0395 (10)	−0.0137 (7)	0.0125 (8)	−0.0093 (7)
N4	0.0423 (10)	0.0287 (10)	0.0475 (12)	−0.0146 (8)	0.0196 (9)	−0.0136 (9)
C1	0.0318 (10)	0.0323 (11)	0.0307 (11)	−0.0099 (8)	0.0034 (8)	−0.0048 (8)
C2	0.0345 (10)	0.0372 (11)	0.0340 (11)	−0.0155 (9)	0.0036 (9)	−0.0039 (9)
C3	0.0338 (11)	0.0506 (14)	0.0356 (12)	−0.0151 (10)	0.0070 (9)	−0.0059 (10)
C4	0.0352 (11)	0.0435 (13)	0.0367 (12)	−0.0073 (10)	0.0092 (9)	−0.0060 (10)
C5	0.0378 (11)	0.0341 (11)	0.0391 (12)	−0.0086 (9)	0.0084 (9)	−0.0052 (9)
C6	0.0316 (10)	0.0319 (11)	0.0313 (11)	−0.0093 (8)	0.0063 (8)	−0.0055 (8)
C7	0.0377 (13)	0.0660 (18)	0.0514 (16)	−0.0123 (12)	0.0170 (11)	−0.0135 (14)
C8	0.0366 (11)	0.0263 (10)	0.0366 (12)	−0.0103 (8)	0.0092 (9)	−0.0077 (9)
C9	0.0307 (10)	0.0261 (10)	0.0349 (11)	−0.0099 (8)	0.0058 (8)	−0.0074 (8)
C10	0.0305 (10)	0.0301 (10)	0.0376 (12)	−0.0089 (8)	0.0093 (9)	−0.0056 (9)
C11	0.0385 (12)	0.0480 (14)	0.0409 (13)	−0.0214 (11)	0.0047 (10)	−0.0031 (11)
C12	0.0345 (12)	0.073 (2)	0.0617 (19)	−0.0205 (13)	0.0095 (12)	0.0031 (15)
C13	0.0555 (17)	0.074 (2)	0.0497 (17)	−0.0136 (15)	0.0238 (14)	−0.0007 (15)
C14	0.082 (2)	0.074 (2)	0.0501 (18)	−0.0261 (18)	0.0280 (16)	−0.0259 (16)
C15	0.0490 (14)	0.0564 (16)	0.0465 (15)	−0.0244 (13)	0.0084 (12)	−0.0166 (13)
C16	0.0622 (17)	0.0440 (14)	0.0489 (16)	−0.0207 (13)	−0.0070 (13)	−0.0120 (12)
C17	0.0620 (16)	0.0285 (11)	0.0433 (14)	−0.0135 (11)	−0.0024 (12)	−0.0033 (10)

Geometric parameters (Å, º) top

Pt1—N2	1.9936 (17)	C6—C8	1.438 (3)
Pt1—O1	2.0201 (15)	C7—H7A	0.9600
Pt1—S2	2.2254 (5)	C7—H7B	0.9600
Pt1—S1	2.2441 (5)	C7—H7C	0.9600
S1—C9	1.745 (2)	C8—H8A	0.9300
S2—O5	1.4694 (18)	C10—C11	1.521 (3)
S2—C17	1.765 (3)	C10—C15	1.522 (4)
S2—C16	1.774 (3)	C10—H10A	0.9800
O1—C1	1.297 (3)	C11—C12	1.519 (4)
O2—N1	1.212 (3)	C11—H11A	0.9700
O3—N1	1.213 (3)	C11—H11B	0.9700
O4—C4	1.370 (3)	C12—C13	1.507 (5)
O4—C7	1.418 (3)	C12—H12A	0.9700
N1—C2	1.456 (3)	C12—H12B	0.9700
N2—C8	1.300 (3)	C13—C14	1.511 (5)
N2—N3	1.377 (2)	C13—H13A	0.9700
N3—C9	1.320 (3)	C13—H13B	0.9700
N4—C9	1.343 (3)	C14—C15	1.521 (4)
N4—C10	1.460 (3)	C14—H14A	0.9700
N4—H1N4	0.83 (3)	C14—H14B	0.9700
C1—C2	1.419 (3)	C15—H15A	0.9700
C1—C6	1.434 (3)	C15—H15B	0.9700
C2—C3	1.391 (3)	C16—H16A	0.9600
C3—C4	1.369 (4)	C16—H16B	0.9600
C3—H3A	0.9300	C16—H16C	0.9600
C4—C5	1.385 (3)	C17—H17A	0.9600
C5—C6	1.395 (3)	C17—H17B	0.9600
C5—H5A	0.9300	C17—H17C	0.9600

N2—Pt1—O1	93.95 (6)	N3—C9—N4	116.41 (19)
N2—Pt1—S2	178.65 (5)	N3—C9—S1	124.17 (16)
O1—Pt1—S2	84.87 (5)	N4—C9—S1	119.42 (16)
N2—Pt1—S1	84.74 (5)	N4—C10—C11	107.99 (19)
O1—Pt1—S1	178.63 (5)	N4—C10—C15	113.0 (2)
S2—Pt1—S1	96.45 (2)	C11—C10—C15	109.9 (2)
C9—S1—Pt1	96.02 (7)	N4—C10—H10A	108.6
O5—S2—C17	109.52 (13)	C11—C10—H10A	108.6
O5—S2—C16	109.00 (14)	C15—C10—H10A	108.6
C17—S2—C16	101.25 (14)	C12—C11—C10	111.1 (2)
O5—S2—Pt1	119.46 (8)	C12—C11—H11A	109.4
C17—S2—Pt1	107.80 (9)	C10—C11—H11A	109.4
C16—S2—Pt1	108.28 (10)	C12—C11—H11B	109.4
C1—O1—Pt1	126.00 (14)	C10—C11—H11B	109.4
C4—O4—C7	117.3 (2)	H11A—C11—H11B	108.0
O2—N1—O3	120.7 (2)	C13—C12—C11	112.0 (2)
O2—N1—C2	121.1 (2)	C13—C12—H12A	109.2
O3—N1—C2	118.2 (2)	C11—C12—H12A	109.2
C8—N2—N3	116.09 (17)	C13—C12—H12B	109.2
C8—N2—Pt1	122.71 (14)	C11—C12—H12B	109.2
N3—N2—Pt1	121.16 (13)	H12A—C12—H12B	107.9
C9—N3—N2	113.79 (17)	C12—C13—C14	111.7 (3)
C9—N4—C10	126.23 (19)	C12—C13—H13A	109.3
C9—N4—H1N4	115 (2)	C14—C13—H13A	109.3
C10—N4—H1N4	118 (2)	C12—C13—H13B	109.3
O1—C1—C2	120.4 (2)	C14—C13—H13B	109.3
O1—C1—C6	124.07 (19)	H13A—C13—H13B	107.9
C2—C1—C6	115.6 (2)	C13—C14—C15	111.6 (3)
C3—C2—C1	123.0 (2)	C13—C14—H14A	109.3
C3—C2—N1	115.8 (2)	C15—C14—H14A	109.3
C1—C2—N1	121.2 (2)	C13—C14—H14B	109.3
C4—C3—C2	120.1 (2)	C15—C14—H14B	109.3
C4—C3—H3A	119.9	H14A—C14—H14B	108.0
C2—C3—H3A	119.9	C14—C15—C10	110.4 (2)
C3—C4—O4	125.0 (2)	C14—C15—H15A	109.6
C3—C4—C5	119.2 (2)	C10—C15—H15A	109.6
O4—C4—C5	115.8 (2)	C14—C15—H15B	109.6
C4—C5—C6	122.3 (2)	C10—C15—H15B	109.6
C4—C5—H5A	118.9	H15A—C15—H15B	108.1
C6—C5—H5A	118.9	S2—C16—H16A	109.5
C5—C6—C1	119.9 (2)	S2—C16—H16B	109.5
C5—C6—C8	115.4 (2)	H16A—C16—H16B	109.5
C1—C6—C8	124.71 (19)	S2—C16—H16C	109.5
O4—C7—H7A	109.5	H16A—C16—H16C	109.5
O4—C7—H7B	109.5	H16B—C16—H16C	109.5
H7A—C7—H7B	109.5	S2—C17—H17A	109.5
O4—C7—H7C	109.5	S2—C17—H17B	109.5
H7A—C7—H7C	109.5	H17A—C17—H17B	109.5
H7B—C7—H7C	109.5	S2—C17—H17C	109.5
N2—C8—C6	128.5 (2)	H17A—C17—H17C	109.5
N2—C8—H8A	115.8	H17B—C17—H17C	109.5
C6—C8—H8A	115.8

C8—N2—N3—C9	179.0 (2)	C2—C1—C6—C5	−0.5 (3)
Pt1—N2—N3—C9	1.3 (3)	O1—C1—C6—C8	−2.8 (4)
Pt1—O1—C1—C2	−178.56 (16)	C2—C1—C6—C8	178.4 (2)
Pt1—O1—C1—C6	2.7 (3)	N3—N2—C8—C6	−177.9 (2)
O1—C1—C2—C3	−179.6 (2)	Pt1—N2—C8—C6	−0.2 (3)
C6—C1—C2—C3	−0.8 (3)	C5—C6—C8—N2	−179.5 (2)
O1—C1—C2—N1	−0.1 (3)	C1—C6—C8—N2	1.5 (4)
C6—C1—C2—N1	178.7 (2)	N2—N3—C9—N4	−178.3 (2)
O2—N1—C2—C3	−176.5 (3)	N2—N3—C9—S1	1.8 (3)
O3—N1—C2—C3	2.7 (4)	C10—N4—C9—N3	178.0 (2)
O2—N1—C2—C1	4.0 (4)	C10—N4—C9—S1	−2.2 (3)
O3—N1—C2—C1	−176.8 (3)	Pt1—S1—C9—N3	−3.4 (2)
C1—C2—C3—C4	0.9 (4)	Pt1—S1—C9—N4	176.77 (19)
N1—C2—C3—C4	−178.6 (2)	C9—N4—C10—C11	162.2 (2)
C2—C3—C4—O4	180.0 (2)	C9—N4—C10—C15	−76.0 (3)
C2—C3—C4—C5	0.4 (4)	N4—C10—C11—C12	−179.2 (2)
C7—O4—C4—C3	4.7 (4)	C15—C10—C11—C12	57.2 (3)
C7—O4—C4—C5	−175.7 (2)	C10—C11—C12—C13	−54.9 (3)
C3—C4—C5—C6	−1.7 (4)	C11—C12—C13—C14	53.0 (4)
O4—C4—C5—C6	178.7 (2)	C12—C13—C14—C15	−54.0 (4)
C4—C5—C6—C1	1.8 (4)	C13—C14—C15—C10	56.7 (4)
C4—C5—C6—C8	−177.2 (2)	N4—C10—C15—C14	−178.6 (2)
O1—C1—C6—C5	178.3 (2)	C11—C10—C15—C14	−57.9 (3)

Hydrogen-bond geometry (Å, º) top

Cg1 is the centroid of chelate ring Pt1/S1/N2/N3/C9.

D—H···A	D—H	H···A	D···A	D—H···A
C17—H17A···O2	0.96	2.53	3.438 (4)	157
N4—H1N4···O5ⁱ	0.83 (3)	2.21 (3)	3.042 (2)	174 (2)
C17—H17B···N3ⁱⁱ	0.96	2.46	3.336 (3)	152
C17—H17C···O3ⁱⁱⁱ	0.96	2.54	3.354 (4)	143
C12—H12A···Cg1ⁱⁱⁱ	0.97	2.95	3.669 (3)	131

Symmetry codes: (i) x, y−1, z; (ii) x, y+1, z; (iii) x−1, y, z.

Selected geometrical parameters for I and related ligands (Å, °) top

	I	BEFZIY	LAQCIR	MOKPOT^a	OBOLOJ	YUXJOS
Pt1—O1	2.0201 (15)	–	–	–	–	–
Pt1—N2	1.9936 (17)	–	–	–	–	–
Pt1—S1	2.2441 (5)	–	–	–	–	–
Pt1—S2	2.2254 (5)	–	–	–	–	–
O1—C1	1.297 (3)	1.352	1.350	1.355, 1.350	1.360	1.362
S1—C9	1.745 (2)	1.693	1.685	1.683, 1.683	1.688	1.691
C6—C8	1.438 (3)	1.488	1.448	1.443, 1.448	1.459	1.457
C8—N2	1.300 (3)	1.294	1.268	1.281, 1.278	1.279	1.287
N2—N3	1.377 (2)	1.373	1.363	1.380, 1.379	1.369	1.388
N3—C9	1.320 (3)	1.354	1.342	1.346, 1.343	1.364	1.357
N4—C9	1.343 (3)	1.335	1.308	1.319, 1.323	1.325	1.336
N4—C10	1.460 (3)	1.467	1.455	1.464, 1.455	1.465	1.466
N2—N3—C9	113.79 (17)	121.82	120.90	121.70, 120.82	121.03	119.03
N3—C9—N4	116.41 (19)	117.02	116.60	117.35, 117.16	115.84	116.29
N2—N3—C9—N4	-178.3 (2)	-6.83	4.08	-6.04, 5.25	-5.50	12.51

Note: (a) MOKPOT crystallized with two independent molecules in the asymmetric unit.

Funding information

Universiti Sains Malaysia and The World Academy of Science are thanked for a USM–TWAS fellowship to Md. Azharul Arafath. Funding for this research was provided by RU grant No. 1001/PKIMIA/811269 from Universiti Sains Malaysia.

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