[Al(H2O)6][Cr(OH)6Mo6O18]·10H2O

Li, B.; Ye, L.; Wu, L.-X.

doi:10.1107/S1600536810053936

[Al(H₂O)₆][Cr(OH)₆Mo₆O₁₈]·10H₂O

The title compound, [Al(H₂O)₆][Cr(OH)₆Mo₆O₁₈]·10H₂O, hexaaquaaluminium hexahydroxidooctadecaoxidomolybdochromate(III) decahydrate, crystallizes isotypically with its gallium analogue [Ga(H₂O)₆][Cr(OH)₆Mo₆O₁₈].10H₂O. In the structure of the title compound, both the [Al(H₂O)₆]³⁺ cation and the Anderson-type [Cr(OH)₆Mo₆O₁₈]³⁻ anion lie on centres of inversion. The anion is composed of seven edge-sharing octahedra, six of which are MoO₆ octahedra that are arranged hexagonally around the central Cr(OH)₆ octahedron. The anions are linked to each other by O—H

O hydrogen bonds into infinite chains along [100]. These chains are further connected with the [Al(H₂O)₆]³⁺ cations through O—H

O hydrogen bonds into sheets parallel to (01 $\overline{1}$ ). O—H

O hydrogen bonds involving all the lattice water molecules finally link the sheets into a three-dimensional network.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536810053936/wm2434sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536810053936/wm2434Isup2.hkl Contains datablock I

checkCIF report

Key indicators

Single-crystal X-ray study
T = 290 K
Mean (Al-O) = 0.004 Å
R factor = 0.033
wR factor = 0.093
Data-to-parameter ratio = 17.5

checkCIF/PLATON results

No syntax errors found



Alert level B
PLAT417_ALERT_2_B Short Inter D-H..H-D       H2     ..  H12     ..       1.96 Ang.
PLAT417_ALERT_2_B Short Inter D-H..H-D       H13    ..  H14     ..       1.84 Ang.
PLAT417_ALERT_2_B Short Inter D-H..H-D       H13    ..  H15     ..       2.04 Ang.
PLAT417_ALERT_2_B Short Inter D-H..H-D       H19    ..  H19     ..       1.94 Ang.
PLAT430_ALERT_2_B Short Inter D...A Contact  OT4    ..  OT6     ..       2.76 Ang.
PLAT934_ALERT_3_B Number of (Iobs-Icalc)/SigmaW .gt. 10 Outliers .          3

Alert level C
PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) .....          5
PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L=  0.600          6
PLAT042_ALERT_1_C Calc. and Reported MoietyFormula Strings  Differ          ?
PLAT480_ALERT_4_C Long H...A H-Bond Reported H18    ..  OT6     ..       2.62 Ang.
PLAT912_ALERT_4_C Missing # of FCF Reflections Above STh/L=  0.600         54

Alert level G
PLAT860_ALERT_3_G Note: Number of Least-Squares Restraints .......         24
PLAT154_ALERT_1_G The su's on the Cell Angles are Equal  (x 10000)       3000 Deg.
PLAT720_ALERT_4_G Number of Unusual/Non-Standard Labels ..........         20
PLAT794_ALERT_5_G Note: Tentative Bond Valency for Mo1     .......       5.98
PLAT794_ALERT_5_G Note: Tentative Bond Valency for Mo2     .......       5.97
PLAT794_ALERT_5_G Note: Tentative Bond Valency for Mo3     .......       5.98
PLAT794_ALERT_5_G Note: Tentative Bond Valency for Al1     .......       3.00

   0 ALERT level A = In general: serious problem
   6 ALERT level B = Potentially serious problem
   5 ALERT level C = Check and explain
   7 ALERT level G = General alerts; check

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

Comment top

Anderson-type polyoxometalate (POM) anions are frequently used as building blocks to construct extended solid frameworks (An et al., 2005; Shivaiah et al., 2003). As a part of our ongoing study on POMs, we report here the crystal structure of the title compound, [Al(H₂O)₆][Cr(OH)₆Mo₆O₁₈].10H₂O.

The crystal structure of the title compound (Fig. 1) consists of [Al(H₂O)₆]³⁺ cations and Anderson-type [Cr(OH)₆Mo₆O₁₈]^3- anions, both with 1 symmetry. The [Cr(OH)₆] octahedron lies on the center of six surrounding [MoO₆] octahedra, all linked through common edges. According to different coordination environments, there are three kinds of O atoms in the anion. The first involves twelve terminal O atoms (labelled OTx) that only bind to one Mo atom with distances ranging from 1.691 (4) Å to 1.721 (3) Å. The second type involves six bridging O atoms (OBx) shared by two Mo atoms with distances ranging from 1.927 (3) Å to 1.951 (3) Å. The third type involves six O atoms (OHx) located between the Mo and Cr atoms with Mo—OH bond lengths ranging from 2.252 (3) Å to 2.314 (3) Å. All these bond lenghths and corresponding angles are in the normal ranges (An et al., 2005).

Abundant hydrogen bonding exist in the title structure (Table 1). The OH groups of the POM anion are involved in forming O—H···O hydrogen bonds to adjacent anions and link the [Cr(OH)₆Mo₆O₁₈]^3- anions into infinite chains along [100]. The chains are further connected with [Al(H₂O)₆]³⁺ octahedra through O—H···O hydrogen bonds into sheets lying parallel to (011). The O—H···O hydrogen bonds involving all the lattice water molecules finally link the sheets into a three-dimensional network (Fig. 2).

It should be noted that the title compound is isotypic with its gallium analogue [Ga(H₂O)₆][Cr(OH)₆Mo₆O₁₈].10H₂O described several years ago (Kaziev, et al. 2002). In the latter structure, the Cr³⁺ and Ga³⁺ sites show occupational disorder due to their very similar ionic radius, while such a disorder is not observed in the title compound.

Related literature top

For background literature on polyoxometalates, see: An et al. (2005); Shivaiah et al. (2003). The isotypic gallium analogue was reported by Kaziev et al. (2002).

Experimental top

CrCl₃.6H₂O (0.532 g, 2 mmol) and Na₂MoO₄.2H₂O (3.629 g, 15 mmol) were dissolved in water (30 ml); ice acetic acid was dropped into the solution until it became clear. The resultant solution was heated for 1 h under stirring and AlCl₃ (0.267 g, 2 mmol) was added subsequently. The mixture was heated for half an hour and cooled to room temperature. Colorless single crystals were obtained three weeks later after partial evaporation of water.

Computing details top

Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top

	Fig. 1. The [Al(H₂O)₆]³⁺ cation and the Anderson-type anion as well as the five independent lattice water molecules of the title compound, showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. H atoms have been omitted for clarity. [Symmetry codes: (A) -x, 1 - y, 1 - z; (B)-x, -y, -z.]
	Fig. 2. Crystal packing diagram of the title compound, showing the three-dimensional network between the molecular entities through hydrogen bonding (dashed lines).

hexaaquaaluminium hexahydroxidooctadecaoxidomolybdochromate(III) decahydrate, top

Crystal data top

[Al(H₂O)₆][Cr(OH)₆Mo₆O₁₈]·10H₂O	Z = 1
M_r = 1332.92	F(000) = 647
Triclinic, P1	D_x = 2.630 Mg m⁻³
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 6.809 (5) Å	Cell parameters from 7543 reflections
b = 11.267 (7) Å	θ = 3.2–27.1°
c = 11.596 (9) Å	µ = 2.63 mm⁻¹
α = 101.26 (3)°	T = 290 K
β = 97.02 (3)°	Block, colorless
γ = 101.81 (3)°	0.12 × 0.12 × 0.11 mm
V = 841.7 (10) Å³

Data collection top

Rigaku R-AXIS RAPID diffractometer	3801 independent reflections
Radiation source: fine-focus sealed tube	3346 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.037
ω scans	θ_max = 27.5°, θ_min = 3.2°
Absorption correction: multi-scan (ABSCOR; Higashi, 1995)	h = −7→8
T_min = 0.745, T_max = 0.770	k = −14→14
8257 measured reflections	l = −15→15

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)] = 0.033	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.093	H-atom parameters constrained
S = 1.10	w = 1/[σ²(F_o²) + (0.0331P)² + 2.719P] where P = (F_o² + 2F_c²)/3
3801 reflections	(Δ/σ)_max = 0.009
217 parameters	Δρ_max = 0.89 e Å⁻³
24 restraints	Δρ_min = −0.86 e Å⁻³

Crystal data top

[Al(H₂O)₆][Cr(OH)₆Mo₆O₁₈]·10H₂O	γ = 101.81 (3)°
M_r = 1332.92	V = 841.7 (10) Å³
Triclinic, P1	Z = 1
a = 6.809 (5) Å	Mo Kα radiation
b = 11.267 (7) Å	µ = 2.63 mm⁻¹
c = 11.596 (9) Å	T = 290 K
α = 101.26 (3)°	0.12 × 0.12 × 0.11 mm
β = 97.02 (3)°

Data collection top

Rigaku R-AXIS RAPID diffractometer	3801 independent reflections
Absorption correction: multi-scan (ABSCOR; Higashi, 1995)	3346 reflections with I > 2σ(I)
T_min = 0.745, T_max = 0.770	R_int = 0.037
8257 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.033	24 restraints
wR(F²) = 0.093	H-atom parameters constrained
S = 1.10	Δρ_max = 0.89 e Å⁻³
3801 reflections	Δρ_min = −0.86 e Å⁻³
217 parameters

Special details top

Experimental. (See detailed section in the paper)

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
Al1	0.0000	0.5000	0.5000	0.0162 (4)
Cr1	0.0000	0.0000	0.0000	0.01424 (19)
Mo1	0.37029 (5)	0.16663 (3)	−0.10502 (3)	0.01629 (11)
Mo2	0.33617 (6)	0.24360 (3)	0.17992 (3)	0.01870 (11)
Mo3	−0.02648 (6)	0.07285 (3)	0.29050 (3)	0.01802 (11)
OH1	0.2099 (4)	−0.0332 (3)	−0.0983 (3)	0.0156 (6)
H1	0.2955	−0.0782	−0.0941	0.023*
OB1	0.1450 (5)	0.1055 (3)	−0.2357 (3)	0.0203 (6)
OT1	0.5602 (5)	0.1125 (3)	−0.1683 (3)	0.0251 (7)
OT2	0.4158 (5)	0.3199 (3)	−0.1095 (3)	0.0287 (8)
OH2	0.1174 (4)	0.1756 (3)	0.0024 (3)	0.0159 (6)
H2	0.0530	0.2258	−0.0217	0.024*
OB2	0.4843 (5)	0.1784 (3)	0.0594 (3)	0.0209 (6)
OT3	0.3656 (6)	0.3945 (3)	0.1671 (3)	0.0321 (8)
OT4	0.5053 (6)	0.2483 (4)	0.3027 (3)	0.0365 (9)
OB3	0.0878 (5)	0.2295 (3)	0.2494 (3)	0.0202 (6)
OH3	0.1830 (5)	0.0372 (3)	0.1527 (3)	0.0166 (6)
H3	0.2705	−0.0068	0.1480	0.025*
OT5	0.1586 (6)	0.0662 (3)	0.3999 (3)	0.0315 (8)
OT6	−0.2117 (6)	0.1163 (4)	0.3617 (3)	0.0334 (8)
OW1	0.1050 (5)	0.3690 (3)	0.5388 (3)	0.0242 (7)
H4	0.2073	0.3992	0.5942	0.036*
H5	0.0411	0.3152	0.5715	0.036*
OW2	0.0105 (5)	0.5686 (3)	0.6627 (3)	0.0234 (7)
H6	−0.0143	0.6394	0.6869	0.035*
H7	0.0689	0.5534	0.7255	0.035*
OW3	0.2655 (5)	0.5935 (3)	0.5085 (3)	0.0254 (7)
H8	0.3070	0.6445	0.5758	0.038*
H9	0.3240	0.6029	0.4491	0.038*
OW4	0.9017 (6)	0.2342 (3)	0.6599 (4)	0.0379 (9)
H10	0.9862	0.2141	0.7084	0.057*
H11	0.8043	0.2487	0.6955	0.057*
OW5	0.0885 (6)	0.6667 (3)	0.0685 (4)	0.0361 (9)
H12	0.1879	0.7302	0.0967	0.054*
H13	0.1180	0.6225	0.0079	0.054*
OW6	0.1882 (6)	0.5186 (4)	0.8662 (4)	0.0378 (9)
H14	0.1337	0.4753	0.9112	0.057*
H15	0.3078	0.5567	0.9018	0.057*
OW7	0.4894 (4)	0.3814 (3)	0.6484 (3)	0.0359 (9)
H16	0.5251	0.4239	0.7199	0.054*
H17	0.4701	0.3052	0.6506	0.054*
OW8	0.4860 (4)	0.1318 (3)	0.5850 (3)	0.0407 (9)
H18	0.4573	0.0970	0.6416	0.061*
H19	0.5475	0.0869	0.5416	0.061*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Al1	0.0168 (9)	0.0139 (8)	0.0166 (9)	0.0037 (6)	0.0007 (7)	0.0011 (7)
Cr1	0.0137 (5)	0.0128 (4)	0.0148 (4)	0.0034 (3)	0.0000 (4)	0.0008 (3)
Mo1	0.01433 (19)	0.01556 (18)	0.0194 (2)	0.00386 (13)	0.00296 (14)	0.00448 (14)
Mo2	0.0168 (2)	0.01554 (18)	0.0188 (2)	0.00120 (13)	−0.00073 (14)	−0.00287 (14)
Mo3	0.0201 (2)	0.01879 (19)	0.01451 (19)	0.00612 (14)	0.00132 (14)	0.00159 (14)
OH1	0.0144 (14)	0.0151 (13)	0.0187 (15)	0.0084 (11)	0.0020 (12)	0.0026 (11)
OB1	0.0223 (16)	0.0205 (14)	0.0188 (16)	0.0051 (12)	0.0015 (13)	0.0073 (12)
OT1	0.0228 (17)	0.0310 (17)	0.0256 (18)	0.0124 (13)	0.0065 (14)	0.0086 (14)
OT2	0.0266 (19)	0.0228 (16)	0.037 (2)	0.0030 (13)	0.0062 (15)	0.0107 (15)
OH2	0.0146 (14)	0.0126 (13)	0.0205 (15)	0.0038 (11)	0.0020 (12)	0.0040 (11)
OB2	0.0183 (16)	0.0221 (15)	0.0199 (16)	0.0041 (12)	0.0001 (13)	0.0017 (12)
OT3	0.036 (2)	0.0178 (15)	0.038 (2)	0.0020 (14)	0.0096 (17)	−0.0011 (14)
OT4	0.030 (2)	0.043 (2)	0.0262 (19)	0.0073 (16)	−0.0073 (16)	−0.0069 (16)
OB3	0.0233 (17)	0.0163 (14)	0.0188 (15)	0.0053 (12)	0.0018 (13)	−0.0007 (12)
OH3	0.0175 (15)	0.0166 (13)	0.0149 (14)	0.0069 (11)	−0.0005 (12)	0.0005 (11)
OT5	0.030 (2)	0.0379 (19)	0.0242 (18)	0.0091 (15)	−0.0051 (15)	0.0070 (15)
OT6	0.036 (2)	0.038 (2)	0.032 (2)	0.0184 (16)	0.0136 (17)	0.0051 (16)
OW1	0.0248 (18)	0.0189 (14)	0.0286 (18)	0.0078 (13)	−0.0001 (14)	0.0047 (13)
OW2	0.0310 (19)	0.0222 (15)	0.0169 (15)	0.0106 (13)	0.0017 (13)	0.0008 (12)
OW3	0.0215 (17)	0.0267 (16)	0.0216 (16)	−0.0024 (13)	0.0032 (13)	−0.0013 (13)
OW4	0.034 (2)	0.0346 (19)	0.050 (2)	0.0118 (16)	−0.0007 (18)	0.0218 (18)
OW5	0.035 (2)	0.0285 (18)	0.044 (2)	0.0106 (15)	0.0019 (18)	0.0068 (16)
OW6	0.036 (2)	0.044 (2)	0.039 (2)	0.0160 (17)	0.0056 (18)	0.0174 (18)
OW7	0.030 (2)	0.048 (2)	0.030 (2)	0.0101 (17)	0.0063 (16)	0.0080 (17)
OW8	0.036 (2)	0.048 (2)	0.035 (2)	0.0049 (18)	−0.0012 (18)	0.0113 (18)

Geometric parameters (Å, º) top

Al1—OW1ⁱ	1.872 (3)	Mo3—OB1ⁱⁱ	1.951 (3)
Al1—OW1	1.872 (3)	Mo3—OB3	1.951 (3)
Al1—OW3ⁱ	1.877 (3)	Mo3—OH3	2.300 (3)
Al1—OW3	1.877 (3)	Mo3—OH1ⁱⁱ	2.330 (3)
Al1—OW2	1.881 (3)	OH1—Mo3ⁱⁱ	2.330 (3)
Al1—OW2ⁱ	1.881 (3)	OH1—H1	0.8500
Cr1—OH3ⁱⁱ	1.954 (3)	OB1—Mo3ⁱⁱ	1.951 (3)
Cr1—OH3	1.954 (3)	OH2—H2	0.8499
Cr1—OH2	1.970 (3)	OH3—H3	0.8501
Cr1—OH2ⁱⁱ	1.970 (3)	OW1—H4	0.8500
Cr1—OH1ⁱⁱ	1.983 (3)	OW1—H5	0.8500
Cr1—OH1	1.983 (3)	OW2—H6	0.8501
Mo1—OT2	1.703 (3)	OW2—H7	0.8499
Mo1—OT1	1.721 (3)	OW3—H8	0.8500
Mo1—OB1	1.927 (3)	OW3—H9	0.8500
Mo1—OB2	1.937 (4)	OW4—H10	0.8500
Mo1—OH2	2.252 (3)	OW4—H11	0.8500
Mo1—OH1	2.314 (3)	OW5—H12	0.8559
Mo2—OT4	1.703 (4)	OW5—H13	0.8496
Mo2—OT3	1.709 (4)	OW6—H14	0.8500
Mo2—OB2	1.939 (3)	OW6—H15	0.8500
Mo2—OB3	1.951 (3)	OW7—H16	0.8509
Mo2—OH2	2.283 (3)	OW7—H17	0.8480
Mo2—OH3	2.288 (3)	OW8—H18	0.8499
Mo3—OT6	1.691 (4)	OW8—H19	0.8500
Mo3—OT5	1.699 (4)

OW1ⁱ—Al1—OW1	180.000 (1)	OT4—Mo2—OH3	94.98 (16)
OW1ⁱ—Al1—OW3ⁱ	89.98 (16)	OT3—Mo2—OH3	158.26 (16)
OW1—Al1—OW3ⁱ	90.02 (16)	OB2—Mo2—OH3	82.20 (13)
OW1ⁱ—Al1—OW3	90.02 (16)	OB3—Mo2—OH3	71.27 (12)
OW1—Al1—OW3	89.98 (16)	OH2—Mo2—OH3	69.73 (11)
OW3ⁱ—Al1—OW3	180.0 (2)	OT6—Mo3—OT5	105.4 (2)
OW1ⁱ—Al1—OW2	89.59 (15)	OT6—Mo3—OB1ⁱⁱ	99.75 (17)
OW1—Al1—OW2	90.41 (15)	OT5—Mo3—OB1ⁱⁱ	97.91 (16)
OW3ⁱ—Al1—OW2	90.13 (15)	OT6—Mo3—OB3	99.14 (17)
OW3—Al1—OW2	89.87 (15)	OT5—Mo3—OB3	102.04 (17)
OW1ⁱ—Al1—OW2ⁱ	90.41 (15)	OB1ⁱⁱ—Mo3—OB3	147.66 (13)
OW1—Al1—OW2ⁱ	89.59 (15)	OT6—Mo3—OH3	163.68 (15)
OW3ⁱ—Al1—OW2ⁱ	89.87 (15)	OT5—Mo3—OH3	89.62 (16)
OW3—Al1—OW2ⁱ	90.13 (15)	OB1ⁱⁱ—Mo3—OH3	84.03 (12)
OW2—Al1—OW2ⁱ	180.000 (1)	OB3—Mo3—OH3	71.00 (12)
OH3ⁱⁱ—Cr1—OH3	180.00 (18)	OT6—Mo3—OH1ⁱⁱ	95.90 (16)
OH3ⁱⁱ—Cr1—OH2	96.53 (13)	OT5—Mo3—OH1ⁱⁱ	157.46 (14)
OH3—Cr1—OH2	83.47 (13)	OB1ⁱⁱ—Mo3—OH1ⁱⁱ	70.90 (12)
OH3ⁱⁱ—Cr1—OH2ⁱⁱ	83.47 (13)	OB3—Mo3—OH1ⁱⁱ	81.26 (13)
OH3—Cr1—OH2ⁱⁱ	96.53 (13)	OH3—Mo3—OH1ⁱⁱ	70.18 (12)
OH2—Cr1—OH2ⁱⁱ	180.00 (18)	Cr1—OH1—Mo1	101.22 (12)
OH3ⁱⁱ—Cr1—OH1ⁱⁱ	94.97 (14)	Cr1—OH1—Mo3ⁱⁱ	101.37 (13)
OH3—Cr1—OH1ⁱⁱ	85.03 (14)	Mo1—OH1—Mo3ⁱⁱ	92.79 (11)
OH2—Cr1—OH1ⁱⁱ	95.90 (12)	Cr1—OH1—H1	131.8
OH2ⁱⁱ—Cr1—OH1ⁱⁱ	84.10 (12)	Mo1—OH1—H1	110.7
OH3ⁱⁱ—Cr1—OH1	85.03 (14)	Mo3ⁱⁱ—OH1—H1	111.9
OH3—Cr1—OH1	94.97 (14)	Mo1—OB1—Mo3ⁱⁱ	120.22 (16)
OH2—Cr1—OH1	84.10 (12)	Cr1—OH2—Mo1	103.79 (12)
OH2ⁱⁱ—Cr1—OH1	95.90 (12)	Cr1—OH2—Mo2	103.22 (13)
OH1ⁱⁱ—Cr1—OH1	180.00 (15)	Mo1—OH2—Mo2	93.30 (12)
OT2—Mo1—OT1	104.94 (17)	Cr1—OH2—H2	125.8
OT2—Mo1—OB1	97.87 (16)	Mo1—OH2—H2	106.7
OT1—Mo1—OB1	101.08 (16)	Mo2—OH2—H2	118.4
OT2—Mo1—OB2	100.85 (16)	Mo1—OB2—Mo2	116.61 (16)
OT1—Mo1—OB2	96.87 (16)	Mo2—OB3—Mo3	118.42 (15)
OB1—Mo1—OB2	149.69 (14)	Cr1—OH3—Mo2	103.55 (13)
OT2—Mo1—OH2	94.45 (14)	Cr1—OH3—Mo3	103.34 (14)
OT1—Mo1—OH2	159.55 (14)	Mo2—OH3—Mo3	93.88 (11)
OB1—Mo1—OH2	82.26 (14)	Cr1—OH3—H3	110.0
OB2—Mo1—OH2	72.74 (13)	Mo2—OH3—H3	110.7
OT2—Mo1—OH1	162.67 (14)	Mo3—OH3—H3	131.6
OT1—Mo1—OH1	90.85 (14)	Al1—OW1—H4	108.5
OB1—Mo1—OH1	71.64 (12)	Al1—OW1—H5	122.9
OB2—Mo1—OH1	83.95 (13)	H4—OW1—H5	97.7
OH2—Mo1—OH1	70.89 (11)	Al1—OW2—H6	122.0
OT4—Mo2—OT3	105.5 (2)	Al1—OW2—H7	131.7
OT4—Mo2—OB2	98.10 (17)	H6—OW2—H7	103.9
OT3—Mo2—OB2	101.59 (16)	Al1—OW3—H8	111.0
OT4—Mo2—OB3	99.29 (18)	Al1—OW3—H9	125.4
OT3—Mo2—OB3	97.85 (16)	H8—OW3—H9	120.8
OB2—Mo2—OB3	149.30 (13)	H10—OW4—H11	107.7
OT4—Mo2—OH2	162.45 (15)	H12—OW5—H13	108.5
OT3—Mo2—OH2	90.88 (16)	H14—OW6—H15	107.7
OB2—Mo2—OH2	72.01 (13)	H16—OW7—H17	107.5
OB3—Mo2—OH2	84.24 (13)	H18—OW8—H19	107.7

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
OH3—H3···OT1ⁱⁱⁱ	0.85	1.85	2.681 (4)	167
OH1—H1···OB2ⁱⁱⁱ	0.85	2.10	2.944 (4)	172
OH2—H2···OW5^iv	0.85	1.82	2.665 (5)	178
OW3—H8···OT4^v	0.85	1.83	2.628 (5)	156
OW3—H9···OW7^v	0.85	1.81	2.632 (5)	163
OW1—H4···OW7	0.85	2.01	2.730 (5)	142
OW1—H5···OW4^vi	0.85	1.74	2.577 (5)	167
OW2—H6···OB3ⁱ	0.85	1.72	2.559 (4)	171
OW2—H7···OW6	0.85	1.88	2.728 (5)	178
OW4—H10···OB1^vii	0.85	1.94	2.737 (5)	156
OW5—H12···OT1^viii	0.86	2.15	3.002 (6)	179
OW5—H13···OW6^ix	0.85	1.99	2.842 (6)	180
OW6—H14···OW5ⁱ	0.85	2.04	2.800 (6)	149
OW6—H15···OT3^v	0.85	2.45	3.091 (6)	133
OW7—H16···OT3^v	0.85	2.13	2.878 (5)	146
OW7—H17···OW8	0.85	1.98	2.759 (5)	152
OW8—H18···OT1^x	0.85	2.19	2.902 (5)	141
OW8—H18···OT6^xi	0.85	2.62	3.241 (5)	131
OW8—H19···OW8^xii	0.85	2.56	3.283 (6)	144

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

Experimental details

Crystal data
Chemical formula	[Al(H₂O)₆][Cr(OH)₆Mo₆O₁₈]·10H₂O
M_r	1332.92
Crystal system, space group	Triclinic, P1
Temperature (K)	290
a, b, c (Å)	6.809 (5), 11.267 (7), 11.596 (9)
α, β, γ (°)	101.26 (3), 97.02 (3), 101.81 (3)
V (Å³)	841.7 (10)
Z	1
Radiation type	Mo Kα
µ (mm⁻¹)	2.63
Crystal size (mm)	0.12 × 0.12 × 0.11

Data collection
Diffractometer	Rigaku R-AXIS RAPID diffractometer
Absorption correction	Multi-scan (ABSCOR; Higashi, 1995)
T_min, T_max	0.745, 0.770
No. of measured, independent and observed [I > 2σ(I)] reflections	8257, 3801, 3346
R_int	0.037
(sin θ/λ)_max (Å⁻¹)	0.649

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.033, 0.093, 1.10
No. of reflections	3801
No. of parameters	217
No. of restraints	24
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.89, −0.86

Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
OH3—H3···OT1ⁱ	0.85	1.85	2.681 (4)	166.8
OH1—H1···OB2ⁱ	0.85	2.10	2.944 (4)	172.4
OH2—H2···OW5ⁱⁱ	0.85	1.82	2.665 (5)	178.1
OW3—H8···OT4ⁱⁱⁱ	0.85	1.83	2.628 (5)	156.2
OW3—H9···OW7ⁱⁱⁱ	0.85	1.81	2.632 (5)	163.4
OW1—H4···OW7	0.85	2.01	2.730 (5)	142.1
OW1—H5···OW4^iv	0.85	1.74	2.577 (5)	167.2
OW2—H6···OB3^v	0.85	1.72	2.559 (4)	170.5
OW2—H7···OW6	0.85	1.88	2.728 (5)	177.8
OW4—H10···OB1^vi	0.85	1.94	2.737 (5)	155.5
OW5—H12···OT1^vii	0.86	2.15	3.002 (6)	179.1
OW5—H13···OW6^viii	0.85	1.99	2.842 (6)	179.8
OW6—H14···OW5^v	0.85	2.04	2.800 (6)	149.2
OW6—H15···OT3ⁱⁱⁱ	0.85	2.45	3.091 (6)	133.0
OW7—H16···OT3ⁱⁱⁱ	0.85	2.13	2.878 (5)	146.0
OW7—H17···OW8	0.85	1.98	2.759 (5)	151.6
OW8—H18···OT1^ix	0.85	2.19	2.902 (5)	140.9
OW8—H18···OT6^x	0.85	2.62	3.241 (5)	130.7
OW8—H19···OW8^xi	0.85	2.56	3.283 (6)	143.5

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

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