Redetermination of hepta­potassium nona­hydrogen bis­[α-hexa­molybdoplatinate(IV)] undeca­hydrate

Lee, U.; Joo, H.-C.; Park, K.-M.

doi:10.1107/S1600536810008639

Redetermination of heptapotassium nonahydrogen bis[α-hexamolybdoplatinate(IV)] undecahydrate

Previously reported at a temperature of 298 (2) K [Lee & Joo (2007). Acta Cryst. E63, i11–i13], the title compound, K₇[H₉α-Pt₂Mo₁₂O₄₈]·11H₂O or K₇[H_4.5α-PtMo₆O₂₄]₂·11H₂O, was redetermined at 146 (2) K in order to determine whether the H atom in the hydrogen bond that crosses the center of symmetry was located at the center of symmetry or disordered around it as assumed in the previous study. During the present low-temperature study it was found on the center of symmetry. One water molecule shows half-occupancy.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536810008639/br2139sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536810008639/br2139Isup2.hkl Contains datablock I

checkCIF report

Key indicators

Single-crystal X-ray study
T = 148 K
Mean (Mo-O) = 0.003 Å
Disorder in solvent or counterion
R factor = 0.021
wR factor = 0.056
Data-to-parameter ratio = 13.3

checkCIF/PLATON results

No syntax errors found



Alert level B
PLAT417_ALERT_2_B Short Inter D-H..H-D       H3     ..  H5A     ..       2.08 Ang.

Author Response: Because of strong HY bonding.

PLAT417_ALERT_2_B Short Inter D-H..H-D       H3     ..  H5B     ..       1.92 Ang.

Author Response: Because of strong HY bonding.


Alert level C
PLAT245_ALERT_2_C U(iso) H2B     Smaller than U(eq) O2W     by ...       0.01 AngSq
PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L=  0.600          2
PLAT042_ALERT_1_C Calc. and Reported MoietyFormula Strings  Differ          ?

Author Response: No problem.

PLAT912_ALERT_4_C Missing # of FCF Reflections Above STh/L=  0.600          2

Alert level G
FORMU01_ALERT_1_G  There is a discrepancy between the atom counts in the
            _chemical_formula_sum and _chemical_formula_moiety. This is
            usually due to the moiety formula being in the wrong format.
            Atom count from _chemical_formula_sum:   H31 K7 Mo12 O59 Pt2
            Atom count from _chemical_formula_moiety:H31 K7 Mo12 O497 Pt2
PLAT860_ALERT_3_G Note: Number of Least-Squares Restraints .......         20
PLAT302_ALERT_4_G Note: Anion/Solvent Disorder ...................       5.00 Perc.

   0 ALERT level A = In general: serious problem
   2 ALERT level B = Potentially serious problem
   4 ALERT level C = Check and explain
   3 ALERT level G = General alerts; check

   2 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   3 ALERT type 2 Indicator that the structure model may be wrong or deficient
   2 ALERT type 3 Indicator that the structure quality may be low
   2 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

Comment top

The α-β-α geometrical isomerization according to the stepwise protonation in the [PtMo₆O₂₄]^8- polyoxometalate species is very unusual phenomenon, viz., ([H_3.5α-PtMo₆O₂₄]^4.5- (Lee & Sasaki, 1994), [H₄β-PtMo₆O₂₄]^4- (Lee & Sasaki, 1994; Joo et al., 1994) and [H_4.5α-PtMo₆O₂₄]^3.5- (Lee & Sasaki, 1994; Lee & Joo, 2007).

This study was carried out to identify the position of the hydrogen atom that lies close to the center of symmetry. The structure of the title compound has been discussed in detail (Lee & Joo, 2007). Fig. 1 shows the structure of the polyanion. The O atoms of the clusters were designated as Ot(terminal Mo═O atom), Ob (O bridged µ₂-O atom), and Oc (µ₃-O atom). The protonated O atoms in the polyanion were identified by the location in difference Fourier maps of the H atoms bound to O atoms and local structural features as seen previously (Lee & Joo, 2006a,b and Table 1). Fig. 2 shows a symmetrical electron density map around H6 atom. The position of H6 is (1/2, 0, 1/2). The distance of O6c–H6 and O6c···.O6cⁱ are 1.28Å and 2.553 (5) Å, and the bond angle of O6c–H6–O6cⁱ is 180 ° (Table 1 & Fig. 3).

The position of H6 was not found on the diffenence map in the previoius report (Lee & Joo, 2007). Therefore the H atom was considered as having positional disorder. The K2 ion is located on the inversion center. As a result the number of K⁺ ion is 7 and H⁺ ion is 9 in the unit cell.

The K⁺ ions are variously coordinated by O atoms as [K1(O_b)(O_t)₂(O_w)₄]⁺, [K2(O_b)₂(O_t)₆]⁺, [K3(O_b)(O_t)₅(O_w)₂]⁺, and [K4(O_t)₅(O_w)₂]⁺, respectively.

Related literature top

For the crystal structure of K_3.5[H_4.5α-PtMo₆O₂₄].5.5H₂O, see : Lee & Joo (2007). For related structures, see : Lee & Sasaki (1994); Joo et al. (1994); Lee & Joo (2006a,b).

Experimental top

Crystals of title compound were prepared by the reaction of K₂MoO₄.2H₂O and K₂Pt(OH)₆ at pH 2.85 as described in a previous report (Lee & Sasaki, 1994).

Computing details top

Data collection: APEX2 (Bruker, 2009); cell refinement: SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); 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 DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top

	Fig. 1. The polyanion structure in the title compound. Displacement ellipsoids are drawn at the 50 % probability level for non-H atoms. H atoms are presented as a small spheres of arbitrary radius.
	Fig. 2. Difference Fourier map around H6 atom where atom H6 is absent.
	Fig. 3. Polyhedral view of the heteropolyanion in the title compound with O–H···O contacts of the inter-anion hydrogen bonds shown as red dashed lines. [Symmetry code: (i) - x + 1, - y, - z + 1.]

heptapotassium nonahydrogen α-dodecamolybdodiplatinate(IV) undecahydrate top

Crystal data top

K₇[H_4.5PtMo₆O₂₄]₂·11H₂O	Z = 1
M_r = 2790.39	F(000) = 1296.0
Triclinic, P1	D_x = 3.541 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 10.0430 (3) Å	Cell parameters from 9000 reflections
b = 12.1512 (4) Å	θ = 2.5–28.3°
c = 12.4498 (4) Å	µ = 8.78 mm⁻¹
α = 67.792 (1)°	T = 148 K
β = 68.542 (1)°	Block, pale yellow
γ = 83.465 (2)°	0.15 × 0.09 × 0.06 mm
V = 1308.58 (7) Å³

Data collection top

Bruker SMART APEXII CCD diffractometer	5699 independent reflections
Radiation source: Rotating Anode	5599 reflections with I > 2σ(I)
Bruker HELIOS graded multilayer optics monochromator	R_int = 0.031
Detector resolution: 10.0 pixels mm^-1	θ_max = 27.0°, θ_min = 1.8°
ϕ and ω scans	h = −12→12
Absorption correction: multi-scan (SADABS; Bruker, 2009)	k = −15→15
T_min = 0.353, T_max = 0.621	l = −15→15
22108 measured reflections

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)] = 0.021	Hydrogen site location: difference Fourier map
wR(F²) = 0.056	H atoms treated by a mixture of independent and constrained refinement
S = 1.23	w = 1/[σ²(F_o²) + (0.0236P)² + 1.1372P] where P = (F_o² + 2F_c²)/3
5699 reflections	(Δ/σ)_max = 0.001
430 parameters	Δρ_max = 0.88 e Å⁻³
20 restraints	Δρ_min = −2.50 e Å⁻³

Crystal data top

K₇[H_4.5PtMo₆O₂₄]₂·11H₂O	γ = 83.465 (2)°
M_r = 2790.39	V = 1308.58 (7) Å³
Triclinic, P1	Z = 1
a = 10.0430 (3) Å	Mo Kα radiation
b = 12.1512 (4) Å	µ = 8.78 mm⁻¹
c = 12.4498 (4) Å	T = 148 K
α = 67.792 (1)°	0.15 × 0.09 × 0.06 mm
β = 68.542 (1)°

Data collection top

Bruker SMART APEXII CCD diffractometer	5699 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2009)	5599 reflections with I > 2σ(I)
T_min = 0.353, T_max = 0.621	R_int = 0.031
22108 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.021	20 restraints
wR(F²) = 0.056	H atoms treated by a mixture of independent and constrained refinement
S = 1.23	Δρ_max = 0.88 e Å⁻³
5699 reflections	Δρ_min = −2.50 e Å⁻³
430 parameters

Special details top

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.

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	0.370508 (12)	0.214544 (10)	0.496464 (11)	0.00637 (5)
Mo1	0.70622 (3)	0.22945 (2)	0.32045 (3)	0.00847 (7)
Mo2	0.47058 (3)	0.32387 (3)	0.19019 (3)	0.00951 (7)
Mo3	0.12269 (3)	0.31421 (2)	0.35851 (3)	0.00933 (7)
Mo4	0.01778 (3)	0.22408 (2)	0.66624 (3)	0.00926 (7)
Mo5	0.26446 (3)	0.14143 (3)	0.79903 (3)	0.00971 (7)
Mo6	0.61144 (3)	0.14446 (2)	0.62239 (3)	0.00808 (7)
K1	0.07055 (10)	0.42124 (8)	0.85759 (9)	0.0273 (2)
K2	0.0000	0.0000	0.5000	0.0355 (4)
K3	0.59498 (11)	0.36460 (8)	0.82891 (9)	0.0313 (2)
K4	0.26045 (10)	0.09021 (8)	0.12674 (8)	0.0281 (2)
O1C	0.5151 (2)	0.3258 (2)	0.3496 (2)	0.0090 (5)
O2C	0.3163 (3)	0.1907 (2)	0.3667 (2)	0.0097 (5)
H2	0.316 (5)	0.118 (3)	0.370 (4)	0.039 (14)*
O3C	0.2066 (3)	0.3296 (2)	0.4991 (2)	0.0100 (5)
H3	0.239 (5)	0.401 (3)	0.484 (5)	0.051 (16)*
O4C	0.2191 (2)	0.1077 (2)	0.6475 (2)	0.0088 (5)
H4	0.206 (5)	0.034 (4)	0.652 (4)	0.036 (13)*
O5C	0.4239 (2)	0.2395 (2)	0.6249 (2)	0.0095 (5)
O6C	0.5309 (3)	0.1025 (2)	0.4921 (2)	0.0098 (5)
H6	0.5000	0.0000	0.5000	0.07 (3)*
O7B	0.6133 (3)	0.1997 (2)	0.2207 (2)	0.0122 (5)
O8B	0.2979 (2)	0.4051 (2)	0.2462 (2)	0.0114 (5)
O9B	0.0238 (2)	0.1989 (2)	0.5211 (2)	0.0119 (5)
O10B	0.1262 (3)	0.2514 (2)	0.7562 (2)	0.0127 (5)
O11B	0.4359 (3)	0.0325 (2)	0.7600 (2)	0.0124 (5)
H11	0.429 (5)	−0.044 (4)	0.767 (5)	0.042 (14)*
O12B	0.7099 (2)	0.2530 (2)	0.4686 (2)	0.0116 (5)
O13T	0.8149 (3)	0.1062 (2)	0.3315 (2)	0.0139 (5)
O14T	0.8155 (3)	0.3469 (2)	0.2130 (2)	0.0145 (5)
O15T	0.5792 (3)	0.4457 (2)	0.0911 (2)	0.0168 (5)
O16T	0.4268 (3)	0.2674 (2)	0.0998 (2)	0.0168 (6)
O17T	0.0066 (3)	0.4276 (2)	0.3516 (3)	0.0170 (6)
O18T	0.0983 (3)	0.2410 (2)	0.2724 (2)	0.0144 (5)
O19T	−0.0931 (3)	0.3406 (2)	0.6643 (3)	0.0178 (6)
O20T	−0.0825 (3)	0.1011 (2)	0.7766 (2)	0.0171 (6)
O21T	0.1625 (3)	0.0179 (2)	0.9083 (2)	0.0194 (6)
O22T	0.3249 (3)	0.2023 (2)	0.8760 (2)	0.0160 (5)
O23T	0.6388 (3)	0.1967 (2)	0.7219 (2)	0.0146 (5)
O24T	0.7139 (2)	0.0163 (2)	0.6320 (2)	0.0122 (5)
O1W	0.0212 (4)	0.1809 (3)	1.0680 (3)	0.0361 (8)
H1A	−0.039 (6)	0.190 (5)	1.132 (4)	0.08 (2)*
H1B	−0.010 (6)	0.114 (4)	1.070 (6)	0.08 (2)*
O2W	0.7580 (6)	0.2330 (4)	0.9609 (4)	0.0773 (17)
H2A	0.738 (8)	0.214 (7)	1.039 (3)	0.13 (3)*
H2B	0.812 (5)	0.181 (4)	0.942 (5)	0.065 (19)*
O3W	0.3643 (3)	0.4685 (3)	0.6662 (3)	0.0297 (7)
H3A	0.421 (4)	0.528 (3)	0.642 (5)	0.046 (15)*
H3B	0.415 (5)	0.413 (3)	0.652 (5)	0.052 (17)*
O4W	0.1450 (3)	0.4420 (3)	1.0368 (3)	0.0232 (6)
H4A	0.226 (3)	0.470 (4)	1.000 (4)	0.043 (15)*
H4B	0.145 (5)	0.382 (3)	1.100 (3)	0.037 (14)*
O5W	0.7096 (3)	0.4622 (2)	0.5447 (3)	0.0199 (6)
H5A	0.782 (4)	0.418 (4)	0.548 (4)	0.046 (15)*
H5B	0.707 (4)	0.478 (4)	0.474 (3)	0.023 (13)*
O6W	0.4612 (8)	−0.0364 (7)	0.0153 (7)	0.044 (2)	0.50
H6A	0.534 (8)	−0.080 (9)	0.005 (11)	0.066*	0.50
H6B	0.410 (11)	−0.064 (11)	−0.010 (11)	0.066*	0.50

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Pt	0.00609 (7)	0.00591 (7)	0.00734 (8)	0.00024 (5)	−0.00257 (6)	−0.00247 (6)
Mo1	0.00692 (14)	0.00822 (13)	0.01040 (15)	0.00071 (10)	−0.00275 (11)	−0.00396 (12)
Mo2	0.00948 (14)	0.01008 (14)	0.00836 (15)	−0.00072 (10)	−0.00320 (12)	−0.00235 (12)
Mo3	0.00878 (14)	0.00899 (14)	0.01138 (16)	0.00063 (10)	−0.00517 (12)	−0.00346 (12)
Mo4	0.00725 (14)	0.00911 (14)	0.01092 (15)	0.00039 (10)	−0.00240 (12)	−0.00391 (12)
Mo5	0.00970 (14)	0.01067 (14)	0.00813 (15)	0.00112 (11)	−0.00255 (12)	−0.00355 (12)
Mo6	0.00793 (14)	0.00677 (13)	0.01079 (15)	0.00094 (10)	−0.00482 (12)	−0.00325 (12)
K1	0.0422 (5)	0.0217 (4)	0.0297 (5)	0.0106 (4)	−0.0209 (4)	−0.0167 (4)
K2	0.0150 (6)	0.0269 (7)	0.0648 (10)	−0.0064 (5)	0.0054 (6)	−0.0334 (7)
K3	0.0470 (6)	0.0201 (4)	0.0281 (5)	0.0015 (4)	−0.0120 (5)	−0.0114 (4)
K4	0.0356 (5)	0.0302 (5)	0.0164 (4)	−0.0166 (4)	−0.0084 (4)	−0.0022 (4)
O1C	0.0081 (11)	0.0091 (11)	0.0080 (12)	−0.0020 (9)	−0.0016 (9)	−0.0017 (10)
O2C	0.0123 (12)	0.0082 (11)	0.0106 (13)	0.0000 (9)	−0.0056 (10)	−0.0041 (10)
O3C	0.0088 (12)	0.0089 (11)	0.0130 (13)	−0.0002 (9)	−0.0051 (10)	−0.0033 (10)
O4C	0.0078 (11)	0.0066 (11)	0.0089 (12)	−0.0021 (9)	−0.0010 (10)	−0.0007 (10)
O5C	0.0097 (11)	0.0120 (11)	0.0097 (12)	0.0009 (9)	−0.0050 (10)	−0.0057 (10)
O6C	0.0080 (11)	0.0093 (11)	0.0123 (13)	0.0008 (9)	−0.0037 (10)	−0.0042 (10)
O7B	0.0110 (12)	0.0144 (12)	0.0137 (13)	0.0009 (9)	−0.0044 (10)	−0.0077 (11)
O8B	0.0111 (12)	0.0107 (11)	0.0127 (13)	0.0000 (9)	−0.0058 (10)	−0.0030 (10)
O9B	0.0109 (12)	0.0119 (11)	0.0117 (13)	−0.0029 (9)	−0.0027 (10)	−0.0035 (10)
O10B	0.0117 (12)	0.0141 (12)	0.0144 (13)	0.0036 (9)	−0.0056 (10)	−0.0075 (11)
O11B	0.0114 (12)	0.0088 (11)	0.0143 (13)	−0.0008 (9)	−0.0031 (10)	−0.0023 (10)
O12B	0.0120 (12)	0.0093 (11)	0.0131 (13)	−0.0008 (9)	−0.0048 (10)	−0.0031 (10)
O13T	0.0094 (12)	0.0129 (12)	0.0203 (14)	0.0008 (9)	−0.0046 (11)	−0.0078 (11)
O14T	0.0130 (12)	0.0136 (12)	0.0145 (13)	−0.0021 (9)	−0.0032 (11)	−0.0035 (11)
O15T	0.0126 (12)	0.0166 (13)	0.0163 (14)	−0.0034 (10)	−0.0034 (11)	−0.0011 (11)
O16T	0.0163 (13)	0.0204 (13)	0.0151 (14)	0.0005 (10)	−0.0063 (11)	−0.0073 (12)
O17T	0.0141 (13)	0.0159 (13)	0.0213 (15)	0.0034 (10)	−0.0081 (11)	−0.0062 (12)
O18T	0.0148 (12)	0.0164 (12)	0.0152 (13)	−0.0002 (10)	−0.0073 (11)	−0.0070 (11)
O19T	0.0142 (13)	0.0168 (13)	0.0248 (15)	0.0045 (10)	−0.0078 (12)	−0.0104 (12)
O20T	0.0145 (13)	0.0157 (13)	0.0159 (14)	−0.0030 (10)	−0.0029 (11)	−0.0017 (11)
O21T	0.0166 (14)	0.0163 (13)	0.0166 (15)	0.0011 (10)	−0.0012 (12)	−0.0012 (12)
O22T	0.0201 (13)	0.0196 (13)	0.0138 (13)	0.0042 (10)	−0.0092 (11)	−0.0097 (11)
O23T	0.0171 (13)	0.0144 (12)	0.0156 (14)	−0.0006 (10)	−0.0069 (11)	−0.0076 (11)
O24T	0.0108 (12)	0.0106 (11)	0.0152 (13)	0.0011 (9)	−0.0050 (10)	−0.0044 (10)
O1W	0.0324 (18)	0.041 (2)	0.0307 (19)	−0.0046 (15)	0.0027 (15)	−0.0203 (17)
O2W	0.099 (4)	0.088 (3)	0.026 (2)	0.072 (3)	−0.019 (2)	−0.023 (2)
O3W	0.0254 (16)	0.0216 (15)	0.044 (2)	−0.0014 (13)	−0.0079 (15)	−0.0178 (15)
O4W	0.0189 (14)	0.0273 (16)	0.0163 (15)	−0.0046 (12)	−0.0062 (12)	0.0009 (13)
O5W	0.0227 (15)	0.0132 (13)	0.0284 (17)	0.0015 (11)	−0.0129 (13)	−0.0091 (13)
O6W	0.051 (6)	0.054 (6)	0.037 (4)	0.030 (4)	−0.032 (4)	−0.018 (4)

Geometric parameters (Å, º) top

Pt—O1C	1.979 (2)	Mo6—O5C	2.091 (2)
Pt—O2C	2.006 (2)	Mo6—O6C	2.286 (2)
Pt—O3C	2.034 (2)	Mo6—O11B	2.114 (2)
Pt—O4C	2.011 (2)	Mo6—O12B	1.840 (2)
Pt—O5C	1.992 (2)	Mo6—O23T	1.701 (2)
Pt—O6C	1.986 (2)	Mo6—O24T	1.756 (2)
Pt—Mo6	3.2149 (3)	K1—O10B	2.713 (3)
Mo1—Mo2	3.2140 (4)	K1—O14Tⁱ	2.854 (3)
Mo1—O1C	2.118 (2)	K1—O17Tⁱⁱ	2.880 (3)
Mo1—O6C	2.329 (2)	K1—O1W	3.039 (4)
Mo1—O7B	1.951 (2)	K1—O3W	2.986 (3)
Mo1—O12B	1.984 (2)	K1—O4W	2.700 (3)
Mo1—O13T	1.742 (2)	K1—O4Wⁱⁱⁱ	2.815 (3)
Mo1—O14T	1.694 (2)	K2—O9B^iv	2.574 (2)
Mo2—O1C	2.196 (2)	K2—O9B	2.574 (2)
Mo2—O2C	2.289 (2)	K2—O13T^v	3.128 (3)
Mo2—O7B	1.987 (2)	K2—O13T^vi	3.128 (3)
Mo2—O8B	1.927 (2)	K2—O18T^iv	3.149 (3)
Mo2—O15T	1.704 (2)	K2—O18T	3.149 (3)
Mo2—O16T	1.716 (3)	K2—O24T^vi	2.767 (2)
Mo3—O2C	2.326 (2)	K2—O24T^v	2.767 (2)
Mo3—O3C	2.273 (3)	K3—O8Bⁱ	2.799 (2)
Mo3—O8B	1.936 (2)	K3—O15Tⁱ	2.985 (3)
Mo3—O9B	1.936 (2)	K3—O16T^vii	2.983 (3)
Mo3—O17T	1.698 (2)	K3—O19T^viii	3.105 (3)
Mo3—O18T	1.721 (2)	K3—O22T	3.282 (3)
Mo4—O3C	2.285 (2)	K3—O23T	2.749 (3)
Mo4—O4C	2.323 (2)	K3—O2W	2.706 (4)
Mo4—O9B	1.923 (3)	K3—O5W	3.068 (3)
Mo4—O10B	1.950 (2)	K4—O16T	2.720 (3)
Mo4—O19T	1.697 (2)	K4—O18T	2.995 (3)
Mo4—O20T	1.707 (2)	K4—O20T^iv	2.702 (3)
Mo5—O4C	2.278 (3)	K4—O22T^ix	2.744 (3)
Mo5—O5C	2.151 (2)	K4—O24T^v	2.883 (3)
Mo5—O10B	1.892 (2)	K4—O1W^ix	2.756 (4)
Mo5—O11B	2.076 (2)	K4—O6W^x	2.866 (8)
Mo5—O21T	1.715 (2)	K4—O6W	2.687 (8)
Mo5—O22T	1.702 (2)	O6C—H6	1.28 (1)

O1C—Pt—O6C	83.77 (10)	O4W—K1—O3W	95.82 (9)
O1C—Pt—O5C	97.36 (10)	O10B—K1—O3W	71.65 (8)
O6C—Pt—O5C	83.63 (10)	O4Wⁱⁱⁱ—K1—O3W	136.06 (9)
O1C—Pt—O2C	82.44 (10)	O14Tⁱ—K1—O3W	66.24 (8)
O6C—Pt—O2C	96.73 (10)	O17Tⁱⁱ—K1—O3W	82.07 (9)
O5C—Pt—O2C	179.57 (9)	O4W—K1—O1W	71.71 (9)
O1C—Pt—O4C	177.47 (9)	O10B—K1—O1W	72.44 (8)
O6C—Pt—O4C	98.47 (10)	O4Wⁱⁱⁱ—K1—O1W	102.34 (9)
O5C—Pt—O4C	81.74 (10)	O14Tⁱ—K1—O1W	139.77 (9)
O2C—Pt—O4C	98.44 (10)	O17Tⁱⁱ—K1—O1W	145.67 (9)
O1C—Pt—O3C	95.90 (10)	O3W—K1—O1W	115.70 (9)
O6C—Pt—O3C	179.41 (9)	O9B^iv—K2—O9B	180.000 (17)
O5C—Pt—O3C	96.90 (10)	O9B—K2—O24T^vi	83.34 (7)
O2C—Pt—O3C	82.74 (10)	O9B—K2—O24T^v	96.66 (7)
O4C—Pt—O3C	81.88 (10)	O9B—K2—O13T^vi	93.58 (7)
O14T—Mo1—O13T	105.35 (12)	O9B—K2—O18T^iv	123.48 (7)
O14T—Mo1—O7B	100.55 (11)	O9B^iv—K2—O18T	123.48 (7)
O13T—Mo1—O7B	96.64 (11)	O9B—K2—O18T	56.52 (7)
O14T—Mo1—O12B	96.89 (11)	O24T^vi—K2—O18T	107.85 (7)
O13T—Mo1—O12B	96.56 (11)	O24T^v—K2—O18T	72.15 (7)
O7B—Mo1—O12B	154.46 (10)	O13T^v—K2—O18T	119.67 (6)
O14T—Mo1—O1C	96.38 (10)	O13T^vi—K2—O18T	60.33 (6)
O13T—Mo1—O1C	158.00 (10)	O18T^iv—K2—O18T	180.00 (14)
O7B—Mo1—O1C	75.67 (9)	O2W—K3—O23T	87.40 (12)
O12B—Mo1—O1C	84.01 (10)	O2W—K3—O8Bⁱ	101.70 (15)
O14T—Mo1—O6C	165.54 (10)	O23T—K3—O8Bⁱ	135.26 (8)
O13T—Mo1—O6C	86.23 (10)	O2W—K3—O16T^vii	68.29 (11)
O7B—Mo1—O6C	86.39 (10)	O23T—K3—O16T^vii	112.47 (8)
O12B—Mo1—O6C	72.78 (9)	O2W—K3—O15Tⁱ	117.98 (11)
O1C—Mo1—O6C	72.89 (9)	O23T—K3—O15Tⁱ	151.29 (8)
O15T—Mo2—O16T	106.40 (12)	O2W—K3—O5W	121.75 (11)
O15T—Mo2—O8B	98.22 (11)	O23T—K3—O5W	64.76 (7)
O16T—Mo2—O8B	100.68 (11)	O8Bⁱ—K3—O5W	73.57 (7)
O15T—Mo2—O7B	101.30 (11)	O16T^vii—K3—O5W	168.39 (8)
O16T—Mo2—O7B	92.82 (11)	O15Tⁱ—K3—O5W	107.09 (7)
O8B—Mo2—O7B	152.03 (10)	O2W—K3—O19T^viii	66.76 (11)
O15T—Mo2—O1C	92.44 (11)	O23T—K3—O19T^viii	63.34 (7)
O16T—Mo2—O1C	158.60 (10)	O5W—K3—O19T^viii	55.12 (7)
O8B—Mo2—O1C	86.22 (9)	O2W—K3—O22T	110.14 (14)
O7B—Mo2—O1C	73.19 (9)	O23T—K3—O22T	59.79 (7)
O15T—Mo2—O2C	161.42 (11)	O8Bⁱ—K3—O22T	145.97 (7)
O16T—Mo2—O2C	91.12 (11)	O16T^vii—K3—O22T	71.25 (7)
O8B—Mo2—O2C	71.88 (9)	O15Tⁱ—K3—O22T	96.63 (7)
O7B—Mo2—O2C	83.57 (9)	O5W—K3—O22T	98.56 (7)
O1C—Mo2—O2C	71.63 (9)	O19T^viii—K3—O22T	123.13 (7)
O17T—Mo3—O18T	106.56 (12)	O6W—K4—O20T^iv	86.85 (17)
O17T—Mo3—O8B	98.83 (11)	O6W—K4—O16T	100.30 (17)
O18T—Mo3—O8B	101.53 (11)	O20T^iv—K4—O16T	163.39 (9)
O17T—Mo3—O9B	101.37 (11)	O6W—K4—O22T^ix	72.57 (17)
O18T—Mo3—O9B	97.67 (11)	O20T^iv—K4—O22T^ix	112.52 (8)
O8B—Mo3—O9B	146.75 (10)	O16T—K4—O22T^ix	84.01 (8)
O17T—Mo3—O3C	99.47 (11)	O6W—K4—O1W^ix	125.74 (17)
O18T—Mo3—O3C	153.10 (10)	O20T^iv—K4—O1W^ix	75.80 (9)
O8B—Mo3—O3C	80.67 (10)	O16T—K4—O1W^ix	110.80 (9)
O9B—Mo3—O3C	70.18 (9)	O22T^ix—K4—O1W^ix	68.01 (9)
O17T—Mo3—O2C	166.65 (11)	O6W—K4—O6W^x	22.7 (3)
O18T—Mo3—O2C	84.31 (10)	O20T^iv—K4—O6W^x	109.37 (17)
O8B—Mo3—O2C	70.90 (9)	O16T—K4—O6W^x	77.87 (16)
O9B—Mo3—O2C	84.41 (10)	O22T^ix—K4—O6W^x	66.98 (16)
O3C—Mo3—O2C	70.96 (9)	O1W^ix—K4—O6W^x	132.79 (17)
O19T—Mo4—O20T	106.07 (13)	O6W—K4—O24T^v	97.28 (17)
O19T—Mo4—O9B	101.28 (12)	O20T^iv—K4—O24T^v	80.55 (8)
O20T—Mo4—O9B	98.83 (12)	O16T—K4—O24T^v	83.66 (8)
O19T—Mo4—O10B	98.77 (11)	O22T^ix—K4—O24T^v	162.32 (8)
O20T—Mo4—O10B	100.44 (12)	O1W^ix—K4—O24T^v	128.57 (9)
O9B—Mo4—O10B	147.02 (10)	O6W^x—K4—O24T^v	98.00 (16)
O19T—Mo4—O3C	95.89 (11)	O6W—K4—O18T	164.77 (16)
O20T—Mo4—O3C	157.14 (10)	O20T^iv—K4—O18T	102.64 (8)
O9B—Mo4—O3C	70.14 (9)	O16T—K4—O18T	67.51 (7)
O10B—Mo4—O3C	82.01 (10)	O22T^ix—K4—O18T	113.50 (8)
O19T—Mo4—O4C	163.39 (11)	O1W^ix—K4—O18T	68.76 (9)
O20T—Mo4—O4C	88.94 (11)	O6W^x—K4—O18T	144.85 (16)
O9B—Mo4—O4C	82.95 (10)	O24T^v—K4—O18T	72.99 (7)
O10B—Mo4—O4C	70.94 (9)	Pt—O1C—Mo1	105.46 (10)
O3C—Mo4—O4C	70.23 (9)	Pt—O1C—Mo2	104.98 (10)
O22T—Mo5—O21T	106.70 (13)	Mo1—O1C—Mo2	96.30 (9)
O22T—Mo5—O10B	101.84 (11)	Pt—O2C—Mo2	100.81 (10)
O21T—Mo5—O10B	102.99 (11)	Pt—O2C—Mo3	102.68 (10)
O22T—Mo5—O11B	97.58 (11)	Mo2—O2C—Mo3	92.77 (9)
O21T—Mo5—O11B	89.09 (11)	Pt—O3C—Mo3	103.60 (10)
O10B—Mo5—O11B	152.95 (10)	Pt—O3C—Mo4	104.25 (10)
O22T—Mo5—O5C	91.56 (11)	Mo3—O3C—Mo4	94.06 (9)
O21T—Mo5—O5C	154.90 (10)	Pt—O4C—Mo5	100.24 (10)
O10B—Mo5—O5C	89.52 (10)	Pt—O4C—Mo4	103.64 (10)
O11B—Mo5—O5C	71.17 (9)	Mo5—O4C—Mo4	92.53 (9)
O22T—Mo5—O4C	162.98 (11)	Pt—O5C—Mo6	103.86 (10)
O21T—Mo5—O4C	90.31 (11)	Pt—O5C—Mo5	105.34 (10)
O10B—Mo5—O4C	72.93 (9)	Mo6—O5C—Mo5	105.12 (10)
O11B—Mo5—O4C	83.03 (9)	Pt—O6C—Mo6	97.38 (10)
O5C—Mo5—O4C	72.45 (9)	Pt—O6C—Mo1	97.89 (10)
O23T—Mo6—O24T	104.61 (11)	Mo6—O6C—Mo1	90.69 (8)
O23T—Mo6—O12B	103.60 (11)	Mo1—O7B—Mo2	109.41 (11)
O24T—Mo6—O12B	103.93 (11)	Mo2—O8B—Mo3	119.78 (12)
O23T—Mo6—O5C	92.37 (11)	Mo2—O8B—K3ⁱ	101.44 (9)
O24T—Mo6—O5C	154.05 (10)	Mo3—O8B—K3ⁱ	137.03 (11)
O12B—Mo6—O5C	90.63 (10)	Mo4—O9B—Mo3	119.62 (12)
O23T—Mo6—O11B	93.94 (11)	Mo5—O10B—Mo4	119.84 (12)
O24T—Mo6—O11B	87.50 (10)	Mo5—O11B—Mo6	107.00 (11)
O12B—Mo6—O11B	155.64 (10)	Mo6—O12B—Mo1	118.20 (12)
O5C—Mo6—O11B	71.63 (9)	H1A—O1W—H1B	103 (4)
O23T—Mo6—O6C	166.81 (10)	H2A—O2W—H2B	105 (4)
O24T—Mo6—O6C	88.05 (10)	H3A—O3W—H3B	107 (3)
O12B—Mo6—O6C	76.34 (10)	H4A—O4W—H4B	109 (4)
O5C—Mo6—O6C	74.46 (9)	H5A—O5W—H5B	105 (3)
O11B—Mo6—O6C	82.73 (9)	H6A—O6W—H6B	101 (10)
O4W—K1—O10B	131.27 (9)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O2C—H2···O24T^v	0.87 (3)	1.70 (3)	2.561 (3)	168 (5)
O3C—H3···O5Wⁱ	0.89 (3)	1.67 (3)	2.552 (4)	177 (5)
O4C—H4···O13T^v	0.89 (5)	1.67 (5)	2.562 (3)	176 (5)
O6C—H6···O6C^v	1.28	1.28	2.553 (3)	180
O11B—H11···O7B^v	0.90 (5)	1.93 (5)	2.826 (3)	172 (4)
O1W—H1A···O13T^xi	0.84 (3)	2.27 (4)	3.014 (4)	149 (5)
O1W—H1B···O21T^xii	0.89 (3)	2.22 (4)	3.067 (4)	159 (6)
O2W—H2A···O7B^vii	0.86 (3)	2.10 (4)	2.906 (5)	157 (7)
O2W—H2B···O21T^xiii	0.83 (3)	2.49 (5)	3.038 (5)	125 (5)
O3W—H3A···O1Cⁱ	0.86 (3)	2.01 (3)	2.811 (4)	154 (5)
O3W—H3B···O5C	0.83 (3)	2.24 (3)	2.973 (4)	147 (4)
O4W—H4A···O15Tⁱ	0.81 (3)	2.03 (3)	2.839 (4)	175 (5)
O4W—H4B···O18T^vii	0.84 (3)	2.11 (3)	2.938 (4)	168 (4)
O5W—H5A···O19T^viii	0.86 (3)	2.14 (3)	2.856 (4)	141 (4)
O5W—H5B···O3Wⁱ	0.83 (2)	1.99 (3)	2.787 (4)	160 (4)
O6W—H6A···O22T^v	0.85 (3)	2.41 (8)	3.097 (7)	138 (11)

Symmetry codes: (i) −x+1, −y+1, −z+1; (v) −x+1, −y, −z+1; (vii) x, y, z+1; (viii) x+1, y, z; (xi) x−1, y, z+1; (xii) −x, −y, −z+2; (xiii) −x+1, −y, −z+2.

Experimental details

Crystal data
Chemical formula	K₇[H_4.5PtMo₆O₂₄]₂·11H₂O
M_r	2790.39
Crystal system, space group	Triclinic, P1
Temperature (K)	148
a, b, c (Å)	10.0430 (3), 12.1512 (4), 12.4498 (4)
α, β, γ (°)	67.792 (1), 68.542 (1), 83.465 (2)
V (Å³)	1308.58 (7)
Z	1
Radiation type	Mo Kα
µ (mm⁻¹)	8.78
Crystal size (mm)	0.15 × 0.09 × 0.06

Data collection
Diffractometer	Bruker SMART APEXII CCD diffractometer
Absorption correction	Multi-scan (SADABS; Bruker, 2009)
T_min, T_max	0.353, 0.621
No. of measured, independent and observed [I > 2σ(I)] reflections	22108, 5699, 5599
R_int	0.031
(sin θ/λ)_max (Å⁻¹)	0.639

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.021, 0.056, 1.23
No. of reflections	5699
No. of parameters	430
No. of restraints	20
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρ_max, Δρ_min (e Å⁻³)	0.88, −2.50

Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998).