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Acta Cryst. (2008). E64, m1143-m1144    [ doi:10.1107/S1600536808025257 ]

Bis(2,6-dimethylpyridinium) hexachloridoplatinate(IV)

V. Amani, R. Rahimi and H. R. Khavasi

Abstract top

The asymmetric unit of the title compound, (C7H10N)2[PtCl6], contains one independent protonated 2,6-dimethylpyridinium cation and half of a centrosymmetric [PtCl6]2- anion. The Pt atom has an octahedral coordination. In the crystal structure, intermolecular N-H...Cl and C-H...Cl hydrogen bonds result in the formation of a supramolecular structure. There is a [pi]-[pi] contact between the pyridine rings [centroid-centroid distance = 4.235 (1) Å].

Comment top

In recent years, there has been considerable interest in proton transfer systems and their structures (Rafizadeh et al., 2006; Yousefi, Amani & Khavasi, 2007; Abedi et al., 2008; Hojjat Kashani et al., 2008). Several proton transfer systems using 2,6-dimethylpyridine, with proton donor molecules, such as [2,6-dmpy.H](NO3), (II), (Jin et al., 2003), [2,6-dmpy.H]2[CoCl4], (III), (Kansikas et al., 1994), [2,6-dmpy.H]Cl, (IV), (Effendy et al., 2006), [2,6-dmpy.H]3[BiBr6], (V), (Bowmaker et al., 1998), [2,6-dmpy.H]2- [O3CrOCrO3], (VI), (Jin et al., 2006) and [2,6-dmpy.H][Ph(COOH)(COO)], (VII), (Jin et al., 2000) [2,6-dmpy.H is 2,6-dimethylpyridinium] have been synthesized and characterized by single-crystal X-ray diffraction methods.

There are also several proton transfer systems using H2[PtCl6] with proton acceptor molecules, such as [HpyBr-3]2[PtCl6].2H2O, (XIII), and [HpyI-3]2[PtCl6].2H2O, (IX),(Zordan & Brammer, 2004), [BMIM]2[PtCl6], (X), and [EMIM]2[PtCl6], (XI), (Hasan et al., 2001), {(DABCO)H2[PtCl6]}, (XII), (Juan et al., 1998), {p-C6H4(CH2ImMe)2[PtCl6]}, (XIII), (Li & Liu, 2003), [het][PtCl6].2H2O, (XIV), (Hu et al., 2003), [9-MeGuaH]2[PtCl6].2H2O, (XV), (Terzis & Mentzafos, 1983), [H10[30]aneN10][PtCl6]2Cl6.2H2O, (XVI), (Bencini et al., 1992), [H2Me2ppz][PtCl6], (XVII), (Ciccarese et al., 1998), [PA]2[PtCl6]Cl, (XVIII), (Delafontaine et al., 1987), [DEA]2[PtCl6], (XIX), (Bokach et al., 2003), [HpyCl-3]3[PtCl6]Cl, (XX), (Zordan et al., 2005), [2,9-dmphen.H]2- [PtCl6], (XXI), (Yousefi, Ahmadi et al., 2007), [H2DA18C6][PtCl6].2H2O, (XXII), (Yousefi et al., 2007a) and [TBA]3[PtCl6]Cl, (XXIII), (Yousefi et al., 2007b) [where hpy is halo- pyridinium, BMIM+ is 1-n-butyl-3-methylimidazolium, EMIM+ is 1-ethyl-3-methylimidazolium, DABCO is 1,4-diazabicyclooctane, Im is imidazolium, het is 2-(α-hydroxyethyl) thiamine, 9-MeGuaH is 9-methylguaninium, [H10[30]aneN10] is [C20H60N10]10+ cation, H2Me2ppz is N,N'-dimethylpiperazinium, PA is pentane-1,5- diammonium, DEA is diethyl-ammonium, 2,9-dmphen.H is 2,9-dimethyl-1,10 -phenanthrolinium, H2DA18C6 is 1,10-Diazonia-18-crown-6 and TBA is tribenzylammonium] have been synthesized and characterized by single-crystal X-ray diffraction methods. We report herein the synthesis and crystal structure of the title compound, (I).

The asymmetric unit of (I), (Fig. 1) contains one independent protonated 2,6-di- methylpyridinium cation and half of a centrosymmetric [PtCl6]2- anion. The Pt ion has an octahedral coordination. In cation, the bond lengths and angles are in good agreement with the corresponding values in (II) and (IV). In [PtCl6]2- anion, the Pt-Cl bond lengths and Cl-Pt-Cl bond angles (Table 1) are also within normal ranges, as in (XXI), (XXII) and (XXIII).

In the crystal structure (Fig. 2), intermolecular N-H···Cl and C-H···Cl hydrogen bonds (Table 2) result in the formation of a supramolecular structure, in which they may be effective in the stabilization of the structure. A π—π contact between A (N1/C2-C6) rings Cg1···Cg1i [symmetry code: (i) -x, 1 - y, 1 - z, where Cg1 is centroid of the ring A (N1/C2-C6)] further stabilize the structure, with centroid-centroid distance of 4.235 (1) Å.

Related literature top

For related literature, see: Abedi et al. (2008); Bencini et al. (1992); Bokach et al. (2003); Bowmaker et al. (1998); Ciccarese et al. (1998); Delafontaine et al. (1987); Effendy et al. (2006); Hasan et al. (2001); Hojjat Kashani et al. (2008); Hu et al. (2003); Jin et al. (2000, 2003, 2006); Juan et al. (1998); Kansikas et al. (1994); Li & Liu (2003); Rafizadeh et al. (2006); Terzis & Mentzafos (1983); Yousefi, Amani & Khavasi (2007); Yousefi, Ahmadi et al. (2007); Yousefi et al. (2007a,b); Zordan & Brammer (2004); Zordan et al. (2005).

Experimental top

For the preparation of the title compound, a solution of 2,6-dimethylpyridine (0.16 g, 1.48 mmol, 0.17 ml) in methanol (15 ml) was added to a solution of H2PtCl6.6H2O, (0.38 g, 0.74 mmol) in acetonitrile (15 ml) and the resulting yellow solution was stirred for 10 min at 313 K. Then, it was left to evaporate slowly at room temperature. After one week, orange prismatic crystals of were isolated (yield; 0.34 g; 73.6%).

Refinement top

H1D atom (for NH) was located in difference syntheses and refined isotropically [N-H = 0.85 (7) Å and Uiso(H) = 0.029 (17) Å2]. The remaining H atoms were positioned geometrically, with C-H = 0.93 and 0.96 Å for aromatic and methyl H, respectively, and constrained to ride on their parent atoms with Uiso(H) = 1.2Ueq(C).

Computing details top

Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1998); data reduction: SAINT (Bruker, 1998); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).

Figures top
[Figure 1] Fig. 1. The molecular structure of the title molecule, with the atom-numbering scheme. Displacement ellipsoids are drawn at the 40% probability level [symmetry code: (a) -x, 1 - y, -z].
[Figure 2] Fig. 2. A packing diagram of (I). Hydrogen bonds are shown as dashed lines.
Bis(2,6-dimethylpyridinium) hexachloridoplatinate(IV) top
Crystal data top
(C7H10N)2[PtCl6]F000 = 596
Mr = 624.10Dx = 2.010 Mg m−3
Monoclinic, P21/nMo Kα radiation
λ = 0.71073 Å
Hall symbol: -P 2ynCell parameters from 1071 reflections
a = 9.9142 (12) Åθ = 2.4–29.1º
b = 9.6031 (10) ŵ = 7.58 mm−1
c = 11.3305 (14) ÅT = 298 (2) K
β = 107.117 (10)ºPrism, orange
V = 1031.0 (2) Å30.48 × 0.45 × 0.38 mm
Z = 2
Data collection top
Bruker SMART CCD area-detector
diffractometer		2756 independent reflections
Radiation source: fine-focus sealed tube2387 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.094
T = 298(2) Kθmax = 29.1º
φ and ω scansθmin = 2.4º
Absorption correction: numerical
(X-SHAPE and X-RED; Stoe & Cie, 2005)		h = −13→13
Tmin = 0.41, Tmax = 0.60k = −12→13
2756 measured reflectionsl = −15→15
Refinement top
Refinement on F2Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: fullH atoms treated by a mixture of
independent and constrained refinement
R[F2 > 2σ(F2)] = 0.069  w = 1/[σ2(Fo2) + (0.1499P)2 + 0.5352P]
where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.189(Δ/σ)max = 0.019
S = 1.10Δρmax = 1.82 e Å−3
2756 reflectionsΔρmin = −1.09 e Å−3
111 parametersExtinction correction: SHELXTL (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: structure-invariant direct methodsExtinction coefficient: 0.029 (3)
Secondary atom site location: difference Fourier map
Crystal data top
(C7H10N)2[PtCl6]V = 1031.0 (2) Å3
Mr = 624.10Z = 2
Monoclinic, P21/nMo Kα
a = 9.9142 (12) ŵ = 7.58 mm−1
b = 9.6031 (10) ÅT = 298 (2) K
c = 11.3305 (14) Å0.48 × 0.45 × 0.38 mm
β = 107.117 (10)º
Data collection top
Bruker SMART CCD area-detector
diffractometer		2756 independent reflections
Absorption correction: numerical
(X-SHAPE and X-RED; Stoe & Cie, 2005)		2387 reflections with I > 2σ(I)
Tmin = 0.41, Tmax = 0.60Rint = 0.094
2756 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.069111 parameters
wR(F2) = 0.189H atoms treated by a mixture of
independent and constrained refinement
S = 1.10Δρmax = 1.82 e Å−3
2756 reflectionsΔρmin = −1.09 e Å−3
Special details top

Experimental. shape of crystal determined optically (X-SHAPE and X-RED; Stoe & Cie, 2005)

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 > 2sigma(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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Pt10.00000.50000.00000.0265 (2)
Cl10.14887 (17)0.56949 (18)−0.11435 (15)0.0411 (4)
Cl20.0667 (2)0.6927 (2)0.12679 (17)0.0504 (5)
Cl3−0.18455 (17)0.6275 (2)−0.12863 (15)0.0486 (5)
N10.3768 (6)0.8089 (7)0.1075 (5)0.0409 (12)
H1D0.348 (8)0.822 (8)0.170 (7)0.029 (17)*
C10.5069 (11)0.6118 (11)0.2190 (9)0.069 (2)
H1A0.42290.56630.22490.082*
H1B0.54750.66530.29240.082*
H1C0.57350.54310.21000.082*
C20.4710 (8)0.7054 (9)0.1103 (8)0.0503 (18)
C30.5217 (11)0.6928 (17)0.0112 (9)0.062 (3)
H30.58750.62410.01040.074*
C40.4756 (12)0.7819 (14)−0.0875 (10)0.076 (3)
H40.50900.7727−0.15570.091*
C50.3790 (11)0.8854 (11)−0.0849 (7)0.064 (3)
H50.34820.9462−0.15130.077*
C60.3278 (8)0.8987 (8)0.0163 (7)0.0472 (16)
C70.224 (2)1.0036 (8)0.033 (2)0.071 (5)
H7A0.13750.9938−0.03250.085*
H7B0.26171.09550.03020.085*
H7C0.20720.98920.11090.085*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C10.057 (5)0.061 (5)0.073 (6)0.009 (4)−0.003 (4)−0.008 (4)
C20.034 (3)0.053 (4)0.060 (4)−0.009 (3)0.009 (3)−0.022 (3)
C30.046 (4)0.071 (7)0.076 (7)−0.015 (5)0.028 (4)−0.031 (5)
C40.069 (6)0.111 (9)0.061 (5)−0.038 (6)0.041 (5)−0.029 (6)
C50.067 (5)0.086 (6)0.036 (3)−0.035 (5)0.011 (4)0.001 (4)
C60.040 (3)0.051 (4)0.044 (3)−0.013 (3)0.003 (3)0.001 (3)
C70.060 (10)0.054 (8)0.092 (15)−0.002 (3)0.011 (10)0.016 (4)
N10.039 (3)0.053 (3)0.034 (2)−0.005 (2)0.016 (2)−0.007 (2)
Pt10.0244 (3)0.0322 (3)0.0223 (3)−0.00137 (8)0.00597 (18)0.00008 (7)
Cl10.0382 (8)0.0514 (9)0.0389 (8)−0.0048 (6)0.0196 (6)0.0033 (6)
Cl20.0563 (10)0.0491 (9)0.0502 (9)−0.0189 (7)0.0224 (8)−0.0207 (7)
Cl30.0365 (8)0.0688 (11)0.0390 (8)0.0165 (7)0.0087 (6)0.0169 (7)
Geometric parameters (Å, °) top
Pt1—Cl22.3161 (16)C2—C31.365 (11)
Pt1—Cl2i2.3161 (16)C3—C41.374 (19)
Pt1—Cl3i2.3239 (16)C3—H30.9300
Pt1—Cl32.3239 (16)C4—C51.387 (18)
Pt1—Cl1i2.3298 (14)C4—H40.9300
Pt1—Cl12.3298 (14)C5—C61.390 (12)
N1—H1D0.85 (7)C5—H50.9300
C1—C21.480 (14)C6—N11.323 (10)
C1—H1A0.9600C6—C71.49 (2)
C1—H1B0.9600C7—H7A0.9600
C1—H1C0.9600C7—H7B0.9600
C2—N11.357 (10)C7—H7C0.9600
Cl1i—Pt1—Cl1180.00 (8)H1B—C1—H1C109.5
Cl2—Pt1—Cl1i89.75 (6)N1—C2—C3117.6 (10)
Cl2i—Pt1—Cl1i90.25 (6)N1—C2—C1117.4 (8)
Cl2—Pt1—Cl190.25 (6)C3—C2—C1125.0 (10)
Cl2i—Pt1—Cl189.75 (6)C2—C3—C4120.0 (12)
Cl2—Pt1—Cl2i180.00 (6)C2—C3—H3120.0
Cl2—Pt1—Cl3i90.20 (8)C4—C3—H3120.0
Cl2i—Pt1—Cl3i89.80 (8)C3—C4—C5119.7 (9)
Cl2—Pt1—Cl389.80 (8)C3—C4—H4120.2
Cl2i—Pt1—Cl390.20 (8)C5—C4—H4120.2
Cl3i—Pt1—Cl1i90.63 (6)C4—C5—C6120.4 (9)
Cl3—Pt1—Cl1i89.37 (6)C4—C5—H5119.8
Cl3i—Pt1—Cl3180.0C6—C5—H5119.8
Cl3i—Pt1—Cl189.37 (6)N1—C6—C5116.4 (8)
Cl3—Pt1—Cl190.63 (6)N1—C6—C7116.9 (11)
C6—N1—C2126.0 (7)C5—C6—C7126.7 (12)
C6—N1—H1D115 (5)C6—C7—H7A109.5
C2—N1—H1D119 (5)C6—C7—H7B109.5
C2—C1—H1A109.5H7A—C7—H7B109.5
C2—C1—H1B109.5C6—C7—H7C109.5
H1A—C1—H1B109.5H7A—C7—H7C109.5
C2—C1—H1C109.5H7B—C7—H7C109.5
H1A—C1—H1C109.5
N1—C2—C3—C4−1.0 (14)C4—C5—C6—C7−179.9 (12)
C1—C2—C3—C4176.8 (10)C5—C6—N1—C2−0.5 (11)
C2—C3—C4—C50.9 (15)C7—C6—N1—C2179.7 (10)
C3—C4—C5—C6−0.5 (14)C3—C2—N1—C60.8 (11)
C4—C5—C6—N10.3 (11)C1—C2—N1—C6−177.1 (7)
Symmetry codes: (i) −x, −y+1, −z.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N1—H1D···Cl3ii0.85 (8)2.45 (8)3.279 (6)168 (7)
C1—H1B···Cl1ii0.962.833.654 (11)145
C4—H4···Cl2iii0.932.713.616 (11)165
Symmetry codes: (ii) x+1/2, −y+3/2, z+1/2; (iii) x+1/2, −y+3/2, z−1/2.
Table 1
Selected geometric parameters (Å, °) top
Pt1—Cl22.3161 (16)Pt1—Cl12.3298 (14)
Pt1—Cl32.3239 (16)
Cl2—Pt1—Cl190.25 (6)Cl2—Pt1—Cl389.80 (8)
Cl2i—Pt1—Cl189.75 (6)Cl3—Pt1—Cl1i89.37 (6)
Cl2—Pt1—Cl3i90.20 (8)Cl3—Pt1—Cl190.63 (6)
Symmetry codes: (i) −x, −y+1, −z.
Table 2
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N1—H1D···Cl3ii0.85 (8)2.45 (8)3.279 (6)168 (7)
C1—H1B···Cl1ii0.962.833.654 (11)145
C4—H4···Cl2iii0.932.713.616 (11)165
Symmetry codes: (ii) x+1/2, −y+3/2, z+1/2; (iii) x+1/2, −y+3/2, z−1/2.
Acknowledgements top

We are grateful to Shahid Beheshti University for financial support.

references
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