Pentapotassium tri­hydrogenhexatungstoplatinate(IV) hexahydrate, K5[H3PtW6O24]·6H2O

Lee, U.

doi:10.1107/S1600536802021505

Pentapotassium trihydrogenhexatungstoplatinate(IV) hexahydrate, K₅[H₃PtW₆O₂₄]·6H₂O

The [H₃PtW₆O₂₄]^5- anion has close to $\overline 3$ m symmetry, with Pt-O bond lengths in the range 1.97 (1)-2.01 (1) Å and W-O bond lengths in the ranges 1.72 (1)-1.78 (1) (O_t), 1.91 (1)-1.96 (1) (O_b) and 2.14 (1)-2.33 (1) Å (O_c), where O_t are terminal atoms, O_b bridge two W atoms, and O_c triply bridge one Pt and two W atoms. The protonated O atoms participate in strong interanion hydrogen bonds.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536802021505/mg6017sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536802021505/mg6017Isup2.hkl Contains datablock I

checkCIF report

Key indicators

Single-crystal X-ray study
T = 298 K
Mean (W-O) = 0.011 Å
H-atom completeness 1%
Disorder in solvent or counterion
R factor = 0.053
wR factor = 0.160
Data-to-parameter ratio = 17.2

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry


 Alert Level C:



PLAT_302  Alert C Anion/Solvent Disorder .......................      15.00 Perc.

General Notes



FORMU_01  There is a discrepancy between the atom counts in the
          _chemical_formula_sum and the formula from the _atom_site* data.
          Atom count from _chemical_formula_sum:H15 K5 O30 Pt1 W6
          Atom count from the _atom_site data:  K5 O30 Pt1 W6

CELLZ_01
         From the CIF: _cell_formula_units_Z    4
         From the CIF: _chemical_formula_sum  H15 K5 O30 Pt W6
         TEST: Compare cell contents of formula and atom_site data

         atom    Z*formula  cif sites diff
         H         60.00      0.00   60.00
         K         20.00     20.00    0.00
         O        120.00    120.00    0.00
         Pt         4.00      4.00    0.00
         W         24.00     24.00    0.00
          Difference between formula and atom_site contents detected.
          WARNING: H atoms missing from atom site list. Is this intentional?


 0 Alert Level A = Potentially serious problem

 0 Alert Level B = Potential problem

 1 Alert Level C = Please check

Comment top

While investigating Anderson-type heteropolyoxometallates containing Pt^IV (Anderson, 1937; Tsigdinos, 1978), we found that gradual protonation and α,β-geometric isomerism occur in the hexamolybdoplatinate(IV) anion, [PtMo₆O₂₄]⁸⁻ (Lee & Sasaki, 1984; Joo et al., 1994; Lee, 1994; Lee & Sasaki, 1994; Lee & Joo, 2000). Only three examples of the corresponding hexatungstoplatinate(IV) anions have been reported: K₆Na₂[PtW₆O₂₄].12H₂O (Lee et al., 1984), Na₅[H₃PtW₆O₂₄].20H₂O (Lee et al., 1983), and K_2.5[H_5.5PtW₆O₂₄]·2H₂O (Lee & Sasaki, 1987). The location of the H atoms in Na₅[H₃PtW₆O₂₄].20H₂O could not be determined.

The potassium salt of triprotonated hexatungstoplatinate (IV), [H₃PtW₆O₂₄]⁵⁻, has now been obtained. The [H₃PtW₆O₂₄]⁵⁻ anions are packed in a different arrangement compared with the sodium salt. These compounds were prepared under conditions varying over a pH range as wide as 4.5–6.7. Fig. 1 shows the [H₃PtW₆O₂₄]⁵⁻ anion, with the O atoms classified in the same way as previously (Lee et al., 1984). It forms a dimer, [H₆(PtW₆O₂₄)₂]¹⁰⁻, by strong hydrogen bonding (Fig. 2). In contrast, hydrogen bonding between adjacent anions does not occur in the sodium salt. Therefore, the potassium salt (4.337 Mg m⁻³) is more densely packed than the sodium salt (3.362 Mg m⁻³). The protonated O atoms in the anion can be identified by examining the W—O distances and the W—O_b—W angles. Protonation increases the W—O distances and decreases the O_b—W—O_b angles by about 10°. The elongation of W—O_c bond distance is especially notable. From this result, it can be concluded that the O_c3 and O_c1 atoms are protonated. Because O_c1 is located in a special position (4i), the number of H⁺ is also 0.5. Thus, the number of 2.5 H⁺ is explained. The remaining protonated O atoms could not be identified with certainty. Examination of the W1—O_b6—W2 [114.1 (5)°] and W3—O_b8—W3' [111.4 (7)°] angles suggests that either the O_b6 or O_b8 atom may be protonated. Since the O_b6 atom is in a general position (8j), it can only be protonated 50% of the time. If interanion O_c3–O_t9 and O_c1–O_c1 hydrogen bonds are formed, the O_b6—O_b6 interanion distance that results is too long to be considered hydrogen bonding. Because O_b8 is in a special position (4i), the number of H⁺ is also 0.5 and it is likely that O_b8 is protonated.

The K⁺ ions are coordinated at distances of 2.7 to 3.4 Å by six or eight O atoms from anions or water molecules. All water molecules are coordinated to K⁺ ions and form hydrogen bonds with neighbouring water molecules or with the O atoms of anions. Fig. 3 shows the unit-cell packing.

Experimental top

The title crystals were isolated as described previously by reaction of K₂WO₄ and K₂[Pt(OH)₆] at pH 4.5 (Lee et al., 1983).

Computing details top

Data collection: STADI4 (Stoe & Cie, 1996); cell refinement: STADI4; data reduction: X-RED (Stoe & Cie, 1996); program(s) used to solve structure: SHELXS97 (Sheldrick, 1990); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 (Version 1.07; Farrugia, 1997) and DIAMOND (Brandenburg, 1998).

Figures top

	Fig. 1. The anion in K₅[H₃PtW₆O₂₄]·6H₂O. Displacement ellipsoids are drawn at the 50% probability level. H atoms are not shown. [Symmetry code: (i) x, −y, z.]
	Fig. 2. Interanion hydrogen bonds shown as a polyhedral model. [Symmetry codes: (i) x, −y, z; (ii) −x, y, −z; (iii) −x, −y, −z.]
	Fig. 3. Crystal packing of K₅[H₃PtW₆O₂₄]·6H₂O. Red circles are K⁺ and green circles are H₂O.

pentapotassium trihydrogenhexatungstoplatinate(IV) hexahydrate top

Crystal data top

K₅[H₃PtW₆O₂₄]·6H2O	F(000) = 3488
M_r = 1988.81	D_x = 4.337 Mg m⁻³
Monoclinic, C2/m	Mo Kα radiation, λ = 0.71069 Å
Hall symbol: -C 2y	Cell parameters from 30 reflections
a = 11.449 (7) Å	θ = 13.5–16.3°
b = 19.829 (10) Å	µ = 27.92 mm⁻¹
c = 13.688 (14) Å	T = 298 K
β = 101.43 (7)°	Truncated octahedron, yellow
V = 3046 (4) Å³	0.28 × 0.16 × 0.16 mm
Z = 4

Data collection top

Stoe Stadi-4 diffractometer	3084 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.000
Graphite monochromator	θ_max = 27.5°, θ_min = 1.5°
ω/2–θ scans	h = −14→14
Absorption correction: numerical (X-SHAPE; Stoe & Cie, 1996)	k = 0→25
T_min = 0.013, T_max = 0.128	l = 0→17
3601 measured reflections	3 standard reflections every 60 min
3601 independent reflections	intensity decay: 3.8%

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	H-atom parameters not refined
R[F² > 2σ(F²)] = 0.053	w = 1/[σ²(F_o²) + (0.0929P)² + 140.7849P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.160	(Δ/σ)_max < 0.001
S = 1.11	Δρ_max = 2.84 e Å⁻³
3601 reflections	Δρ_min = −2.77 e Å⁻³
209 parameters	Extinction correction: SHELXL97, Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.00046 (4)
Primary atom site location: structure-invariant direct methods

Crystal data top

K₅[H₃PtW₆O₂₄]·6H2O	V = 3046 (4) Å³
M_r = 1988.81	Z = 4
Monoclinic, C2/m	Mo Kα radiation
a = 11.449 (7) Å	µ = 27.92 mm⁻¹
b = 19.829 (10) Å	T = 298 K
c = 13.688 (14) Å	0.28 × 0.16 × 0.16 mm
β = 101.43 (7)°

Data collection top

Stoe Stadi-4 diffractometer	3084 reflections with I > 2σ(I)
Absorption correction: numerical (X-SHAPE; Stoe & Cie, 1996)	R_int = 0.000
T_min = 0.013, T_max = 0.128	3 standard reflections every 60 min
3601 measured reflections	intensity decay: 3.8%
3601 independent reflections

Refinement top

R[F² > 2σ(F²)] = 0.053	0 restraints
wR(F²) = 0.160	H-atom parameters not refined
S = 1.11	w = 1/[σ²(F_o²) + (0.0929P)² + 140.7849P] where P = (F_o² + 2F_c²)/3
3601 reflections	Δρ_max = 2.84 e Å⁻³
209 parameters	Δρ_min = −2.77 e Å⁻³

Special details top

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.

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

	x	y	z	U_iso*/U_eq	Occ. (<1)
Pt	0.21219 (6)	0.0000	0.15044 (6)	0.0167 (2)
W1	0.21388 (5)	0.08566 (3)	−0.05557 (4)	0.0194 (2)
W2	0.23276 (5)	0.16728 (3)	0.15204 (4)	0.0212 (2)
W3	0.24516 (5)	0.08082 (3)	0.36674 (5)	0.0223 (2)
K1	−0.0447 (8)	0.2141 (5)	0.2959 (6)	0.112 (3)
K2	0.5000	0.2319 (2)	0.0000	0.0280 (10)
K3	0.4361 (7)	0.0000	0.6340 (6)	0.0617 (19)
K4	0.0000	0.0464 (10)	0.5000	0.091 (7)	0.50
K5	0.4989 (14)	0.0000	0.874 (3)	0.118 (10)	0.50
Oc1	0.1175 (14)	0.0000	0.0118 (11)	0.024 (3)
Oc2	0.3011 (8)	0.0729 (5)	0.0995 (8)	0.020 (2)
Oc3	0.1306 (8)	0.0771 (5)	0.2056 (8)	0.019 (2)
Oc4	0.3102 (12)	0.0000	0.2894 (12)	0.024 (3)
Ob5	0.2905 (13)	0.0000	−0.0733 (12)	0.026 (3)
Ob6	0.1407 (9)	0.1492 (5)	0.0203 (8)	0.025 (2)
Ob7	0.3183 (8)	0.1376 (5)	0.2830 (8)	0.020 (2)
Ob8	0.1622 (13)	0.0000	0.3950 (12)	0.024 (3)
Ot9	0.0989 (12)	0.0857 (5)	−0.1637 (9)	0.031 (3)
Ot10	0.3279 (10)	0.1327 (6)	−0.0857 (10)	0.035 (3)
Ot11	0.3445 (10)	0.2184 (6)	0.1264 (10)	0.031 (3)
Ot12	0.1292 (9)	0.2212 (5)	0.1884 (9)	0.028 (2)
Ot13	0.1376 (11)	0.1365 (6)	0.3958 (9)	0.034 (3)
Ot14	0.3626 (12)	0.0809 (6)	0.4677 (10)	0.039 (3)
Ow1	0.437 (2)	0.132 (2)	0.726 (3)	0.21 (2)
Ow2	0.0000	0.2871 (15)	0.5000	0.120 (15)
Ow3	0.185 (3)	0.0000	0.667 (2)	0.15 (2)
Ow4	0.269 (4)	0.308 (4)	0.406 (4)	0.40 (6)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Pt	0.0184 (3)	0.0159 (4)	0.0157 (4)	0.000	0.0032 (3)	0.000
W1	0.0190 (3)	0.0203 (3)	0.0193 (3)	−0.00073 (18)	0.0045 (2)	0.0024 (2)
W2	0.0234 (3)	0.0171 (3)	0.0241 (3)	−0.00171 (19)	0.0076 (2)	−0.0004 (2)
W3	0.0256 (3)	0.0228 (3)	0.0182 (3)	−0.0007 (2)	0.0038 (2)	−0.0027 (2)
K1	0.110 (5)	0.150 (8)	0.087 (5)	0.076 (6)	0.045 (4)	0.056 (5)
K2	0.026 (2)	0.024 (2)	0.035 (3)	0.000	0.0085 (18)	0.000
K3	0.059 (4)	0.065 (5)	0.053 (4)	0.000	−0.008 (3)	0.000
K4	0.114 (14)	0.072 (11)	0.120 (17)	0.000	0.100 (14)	0.000
K5	0.034 (8)	0.091 (15)	0.24 (3)	0.000	0.044 (12)	0.000
Oc1	0.033 (8)	0.023 (7)	0.011 (7)	0.000	−0.004 (6)	0.000
Oc2	0.017 (4)	0.016 (4)	0.027 (6)	0.000 (4)	0.006 (4)	0.001 (4)
Oc3	0.016 (4)	0.019 (5)	0.022 (5)	0.000 (3)	0.005 (4)	−0.007 (4)
Oc4	0.022 (7)	0.029 (8)	0.024 (8)	0.000	0.013 (6)	0.000
Ob5	0.026 (7)	0.023 (7)	0.031 (9)	0.000	0.006 (6)	0.000
Ob6	0.029 (5)	0.025 (5)	0.020 (5)	0.010 (4)	0.001 (4)	0.004 (4)
Ob7	0.016 (4)	0.024 (5)	0.020 (5)	−0.003 (4)	−0.002 (4)	−0.007 (4)
Ob8	0.026 (7)	0.021 (7)	0.028 (8)	0.000	0.012 (6)	0.000
Ot9	0.048 (7)	0.022 (5)	0.020 (6)	−0.001 (5)	0.001 (5)	0.003 (4)
Ot10	0.035 (6)	0.026 (6)	0.046 (7)	−0.009 (5)	0.015 (5)	−0.007 (5)
Ot11	0.031 (5)	0.024 (5)	0.040 (7)	−0.011 (4)	0.011 (5)	−0.006 (5)
Ot12	0.032 (5)	0.023 (5)	0.033 (6)	0.012 (4)	0.016 (5)	0.002 (5)
Ot13	0.052 (7)	0.032 (6)	0.025 (6)	0.014 (5)	0.024 (5)	0.002 (5)
Ot14	0.045 (7)	0.041 (7)	0.023 (6)	−0.001 (5)	−0.011 (5)	−0.001 (5)
Ow1	0.057 (13)	0.31 (5)	0.25 (4)	−0.04 (2)	0.014 (18)	−0.21 (4)
Ow2	0.12 (3)	0.057 (18)	0.16 (4)	0.000	−0.04 (3)	0.000
Ow3	0.08 (2)	0.35 (7)	0.040 (16)	0.000	0.021 (15)	0.000
Ow4	0.19 (4)	0.63 (12)	0.29 (6)	0.26 (6)	−0.13 (4)	−0.31 (8)

Geometric parameters (Å, º) top

W1—W1ⁱ	3.397 (2)	K1—Ob7ⁱⁱⁱ	3.321 (13)
W1—W2	3.240 (3)	K1—Ow1^iv	3.33 (4)
W2—W3	3.381 (3)	K2—Ot11	2.731 (12)
W3—W3ⁱ	3.205 (2)	K2—Ot11^v	2.731 (12)
Pt—Oc2	1.973 (10)	K2—Ob6^vi	2.837 (11)
Pt—Oc1	1.990 (14)	K2—Ob6^vii	2.837 (11)
Pt—Oc4	2.007 (16)	K2—Ot12^vi	2.862 (12)
Pt—Oc3	2.014 (10)	K2—Ot12^vii	2.862 (12)
W1—Ot10	1.720 (11)	K2—Ot10	2.866 (12)
W1—Ot9	1.775 (12)	K2—Ot10^v	2.866 (12)
W1—Ob6	1.927 (11)	K3—Ot14ⁱ	2.775 (14)
W1—Ob5	1.949 (8)	K3—Ot14	2.775 (14)
W1—Oc2	2.174 (11)	K3—Oc4^viii	2.886 (16)
W1—Oc1	2.315 (11)	K3—Ow1ⁱ	2.90 (3)
W2—Ot11	1.721 (11)	K3—Ow1	2.90 (3)
W2—Ot12	1.740 (10)	K3—Ow3	3.00 (3)
W2—Ob6	1.934 (11)	K3—Ot14^ix	3.330 (16)
W2—Ob7	1.956 (10)	K3—Ot14^viii	3.330 (16)
W2—Oc2	2.203 (10)	K4—Ob8^x	2.724 (15)
W2—Oc3	2.333 (10)	K4—Ob8	2.724 (15)
W3—Ot14	1.727 (12)	K4—Ot13^xi	2.933 (17)
W3—Ot13	1.758 (11)	K4—Ot13	2.933 (17)
W3—Ob7	1.913 (11)	K4—Ow3^x	2.93 (3)
W3—Ob8	1.940 (8)	K4—Ow3	2.93 (3)
W3—Oc4	2.135 (10)	K5—Ob5^xii	2.63 (2)
W3—Oc3	2.334 (11)	K5—Oc2^ix	2.671 (16)
Ob6—Ob6ⁱⁱ	3.16 (2)	K5—Oc2^viii	2.671 (16)
K1—Ot12	2.705 (14)	K5—Ob5^viii	3.26 (3)
K1—Ot13	2.732 (14)	K5—Ow1ⁱ	3.30 (6)
K1—Ot11ⁱⁱⁱ	2.760 (14)	K5—Ow1	3.30 (6)
K1—Ow4ⁱⁱⁱ	2.88 (5)	K5—Ot10^xiii	3.389 (17)
K1—Ow2	3.097 (17)	K5—Ot10^xii	3.389 (16)
K1—Ot9ⁱⁱ	3.115 (16)	K5—Oc4^viii	3.42 (3)

W1—W2—W3	119.54 (6)	Ot14—W3—Ob8	100.1 (6)
W3ⁱ—W3—W2	120.47 (3)	Ot13—W3—Ob8	94.7 (5)
W2—W1—W1ⁱ	119.97 (3)	Ob7—W3—Ob8	153.5 (5)
Oc2ⁱ—Pt—Oc2	94.2 (6)	Pt—Oc1—W1	99.6 (5)
Oc2ⁱ—Pt—Oc1	83.4 (5)	Pt—Oc1—W1ⁱ	99.6 (5)
Oc2ⁱ—Pt—Oc4	96.0 (4)	W1—Oc1—W1ⁱ	94.4 (6)
Oc1—Pt—Oc4	179.1 (6)	Pt—Oc2—W1	105.1 (4)
Oc2ⁱ—Pt—Oc3ⁱ	83.5 (4)	Pt—Oc2—W2	105.4 (5)
Ot10—W1—Ob6	101.9 (5)	W1—Oc2—W2	95.5 (4)
Ot9—W1—Ob6	96.8 (5)	Pt—Oc3—W2	99.5 (4)
Ob6—W1—Ob5	153.1 (6)	Pt—Oc3—W3	99.4 (4)
Ot10—W1—Oc2	94.2 (5)	W2—Oc3—W3	92.9 (3)
Ot9—W1—Oc2	159.3 (5)	Pt—Oc4—W3	106.6 (5)
Ob6—W1—Oc2	73.4 (4)	Pt—Oc4—W3ⁱ	106.6 (5)
Ot11—W2—Ot12	105.8 (6)	W3—Oc4—W3ⁱ	97.3 (6)
Ot11—W2—Ob6	102.1 (5)	W1ⁱ—Ob5—W1	121.3 (8)
Ot12—W2—Ob6	96.0 (5)	W1—Ob6—W2	114.1 (5)
Ot11—W2—Ob7	96.1 (5)	W1—Ob6—Ob6ⁱⁱ	116.3 (5)
Ot12—W2—Ob7	99.7 (5)	W2—Ob6—Ob6ⁱⁱ	120.8 (6)
Ob6—W2—Ob7	151.7 (4)	K2^vii—Ob6—Ob6ⁱⁱ	56.2 (2)
Ot14—W3—Ot13	106.8 (6)	W3—Ob7—W2	121.8 (5)
Ot14—W3—Ob7	96.6 (6)	W3—Ob8—W3ⁱ	111.4 (7)
Ot13—W3—Ob7	100.1 (5)

Symmetry codes: (i) x, −y, z; (ii) −x, y, −z; (iii) x−1/2, −y+1/2, z; (iv) −x+1/2, −y+1/2, −z+1; (v) −x+1, y, −z; (vi) x+1/2, −y+1/2, z; (vii) −x+1/2, −y+1/2, −z; (viii) −x+1, −y, −z+1; (ix) −x+1, y, −z+1; (x) −x, −y, −z+1; (xi) −x, y, −z+1; (xii) x, y, z+1; (xiii) x, −y, z+1.

Hydrogen-bond geometry (Å) top

D—H···A	D···A
Oc1···Oc1ⁱⁱ	2.64 (3)
Oc3···Ot9ⁱⁱ	2.582 (16)
Ow1···Ob7^ix	2.83 (3)
Ow1···Ow4^iv	2.93 (6)
Ow1···Ot10^xii	3.08 (4)
Ow2···Ot14^iv	3.04 (3)
Ow3···Ot9^xii	3.18 (3)
Ow4···Ot13^iv	2.92 (4)

Symmetry codes: (ii) −x, y, −z; (iv) −x+1/2, −y+1/2, −z+1; (ix) −x+1, y, −z+1; (xii) x, y, z+1.

Experimental details

Crystal data
Chemical formula	K₅[H₃PtW₆O₂₄]·6H2O
M_r	1988.81
Crystal system, space group	Monoclinic, C2/m
Temperature (K)	298
a, b, c (Å)	11.449 (7), 19.829 (10), 13.688 (14)
β (°)	101.43 (7)
V (Å³)	3046 (4)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	27.92
Crystal size (mm)	0.28 × 0.16 × 0.16

Data collection
Diffractometer	Stoe Stadi-4 diffractometer
Absorption correction	Numerical (X-SHAPE; Stoe & Cie, 1996)
T_min, T_max	0.013, 0.128
No. of measured, independent and observed [I > 2σ(I)] reflections	3601, 3601, 3084
R_int	0.000
(sin θ/λ)_max (Å⁻¹)	0.650

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.053, 0.160, 1.11
No. of reflections	3601
No. of parameters	209
H-atom treatment	H-atom parameters not refined
	w = 1/[σ²(F_o²) + (0.0929P)² + 140.7849P] where P = (F_o² + 2F_c²)/3
Δρ_max, Δρ_min (e Å⁻³)	2.84, −2.77

Computer programs: STADI4 (Stoe & Cie, 1996), STADI4, X-RED (Stoe & Cie, 1996), SHELXS97 (Sheldrick, 1990), SHELXL97 (Sheldrick, 1997), ORTEP-3 (Version 1.07; Farrugia, 1997) and DIAMOND (Brandenburg, 1998).

Selected geometric parameters (Å, º) top

W1—W1ⁱ	3.397 (2)	W2—Ot11	1.721 (11)
W1—W2	3.240 (3)	W2—Ot12	1.740 (10)
W2—W3	3.381 (3)	W2—Ob6	1.934 (11)
W3—W3ⁱ	3.205 (2)	W2—Ob7	1.956 (10)
Pt—Oc2	1.973 (10)	W2—Oc2	2.203 (10)
Pt—Oc1	1.990 (14)	W2—Oc3	2.333 (10)
Pt—Oc4	2.007 (16)	W3—Ot14	1.727 (12)
Pt—Oc3	2.014 (10)	W3—Ot13	1.758 (11)
W1—Ot10	1.720 (11)	W3—Ob7	1.913 (11)
W1—Ot9	1.775 (12)	W3—Ob8	1.940 (8)
W1—Ob6	1.927 (11)	W3—Oc4	2.135 (10)
W1—Ob5	1.949 (8)	W3—Oc3	2.334 (11)
W1—Oc2	2.174 (11)	Ob6—Ob6ⁱⁱ	3.16 (2)
W1—Oc1	2.315 (11)

W1—W2—W3	119.54 (6)	W1—Ob6—W2	114.1 (5)
W3ⁱ—W3—W2	120.47 (3)	W3—Ob7—W2	121.8 (5)
W2—W1—W1ⁱ	119.97 (3)	W3—Ob8—W3ⁱ	111.4 (7)
W1ⁱ—Ob5—W1	121.3 (8)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D···A
Oc1···Oc1ⁱⁱ	2.64 (3)
Oc3···Ot9ⁱⁱ	2.582 (16)
Ow1···Ob7ⁱⁱⁱ	2.83 (3)
Ow1···Ow4^iv	2.93 (6)
Ow1···Ot10^v	3.08 (4)
Ow2···Ot14^iv	3.04 (3)
Ow3···Ot9^v	3.18 (3)
Ow4···Ot13^iv	2.92 (4)

Symmetry codes: (ii) −x, y, −z; (iii) −x+1, y, −z+1; (iv) −x+1/2, −y+1/2, −z+1; (v) x, y, z+1.

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Pentapotassium tri­hydrogenhexatungstoplatinate(IV) hexahydrate, K5[H3PtW6O24]·6H2O

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Pentapotassium trihydrogenhexatungstoplatinate(IV) hexahydrate, K₅[H₃PtW₆O₂₄]·6H₂O