Structural trends and the electronic structure of the rare-earth oxomolybdates RMo₅O₈ (R = La, Ce, Pr, Nd, Sm, Eu and Gd) containing chains of bioctahedral Mo₁₀ clusters

The crystal structures of the rare-earth members of the series RMo₅O₈ (R = Ce to Eu) have been investigated and compared with those of the La and Gd members previously published in order to understand the influences of the size and the charge of the cation on the different Mo-Mo bonds. The RMo₅O₈ compounds crystallize in the monoclinic space group P2₁/c. Their crystal structure is characterized by bioctahedral Mo₁₀ clusters forming extended chains. The results of our single-crystal studies show that the modification of charge predominantly affects the Mo-Mo bonds between the Mo₁₀ clusters and, to a lesser extent, the intra-cluster distances, while the cationic size induces only small variations. Theoretical investigations confirm this statement and allow the understanding of the bonding mode in these compounds.

Computing details

For all compounds, data collection: COLLECT (Nonius, 1998); cell refinement: COLLECT; data reduction: DENZO and SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: DIAMOND(Bergerhoff, 1996); software used to prepare material for publication: SHELXL97 (Sheldrick, 1997).

Figures

(CeMo5O8)

Crystal data

CeMo5O8	F(000) = 1328
Mr = 747.82	Dx = 7.733 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71070 Å
a = 7.5643 (1) Å	Cell parameters from 9841 reflections
b = 9.0693 (1) Å	θ = 1–37.8°
c = 9.9150 (2) Å	µ = 16.42 mm^−1
β = 109.2113 (8)°	T = 293 K
V = 642.32 (2) Å^3	Plate, black
Z = 4	0.14 × 0.10 × 0.08 mm

Data collection

Nonius KappaCCD diffractometer	3402 independent reflections
Radiation source: fine-focus sealed tube	3314 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.064
ϕ scans (κ = 0) + additional ω scans	θmax = 37.8°, θmin = 2.9°
Absorption correction: gaussian '(Coppens, P., Leiserowitz, L. & Rabinovich, D. 1965)'	h = −12→11
Tmin = 0.064, Tmax = 0.181	k = −15→15
12944 measured reflections	l = −12→17

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.034	w = 1/[σ^2(Fo^2) + (0.P)^2 + 7.228P] where P = (Fo^2 + 2Fc^2)/3
wR(F^2) = 0.080	(Δ/σ)max = 0.001
S = 1.26	Δρmax = 2.54 e Å^−3
3402 reflections	Δρmin = −2.50 e Å^−3
128 parameters	Extinction correction: SHELXL, Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.0171 (5)

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq
Ce	0.26252 (3)	0.50415 (3)	0.53794 (2)	0.00673 (7)
Mo1	0.60444 (5)	−0.11531 (4)	0.48646 (3)	0.00391 (7)
Mo2	0.38347 (5)	−0.11788 (4)	0.67714 (4)	0.00413 (7)
Mo3	0.17299 (5)	−0.12687 (4)	0.38284 (4)	0.00336 (7)
Mo4	0.80812 (5)	−0.12971 (4)	0.29777 (3)	0.00328 (7)
Mo5	−0.00249 (5)	−0.12281 (4)	0.58641 (3)	0.00341 (7)
O1	0.3976 (4)	0.0053 (3)	0.8493 (3)	0.0061 (5)
O2	−0.0012 (4)	−0.2222 (3)	0.9329 (3)	0.0057 (5)
O3	−0.0137 (5)	0.0023 (3)	0.2307 (3)	0.0059 (5)
O4	0.3915 (4)	−0.2475 (4)	0.0123 (3)	0.0062 (5)
O5	0.7951 (4)	−0.2418 (4)	0.1142 (3)	0.0055 (5)
O6	0.1998 (4)	−0.2396 (4)	0.2091 (3)	0.0065 (5)
O7	0.6056 (4)	−0.2356 (3)	0.8292 (3)	0.0056 (5)
O8	0.3831 (4)	−0.0071 (3)	0.3277 (3)	0.0062 (5)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Ce	0.00588 (10)	0.00733 (10)	0.00682 (10)	−0.00032 (6)	0.00188 (7)	0.00051 (6)
Mo1	0.00351 (13)	0.00360 (13)	0.00403 (13)	0.00009 (9)	0.00045 (10)	−0.00009 (9)
Mo2	0.00385 (13)	0.00450 (13)	0.00342 (13)	−0.00034 (9)	0.00037 (10)	0.00055 (9)
Mo3	0.00327 (13)	0.00388 (13)	0.00301 (13)	0.00020 (9)	0.00114 (10)	−0.00017 (9)
Mo4	0.00318 (13)	0.00376 (12)	0.00289 (13)	−0.00009 (9)	0.00100 (10)	−0.00021 (9)
Mo5	0.00331 (14)	0.00362 (13)	0.00323 (13)	−0.00013 (9)	0.00099 (10)	0.00020 (9)
O1	0.0045 (12)	0.0073 (12)	0.0056 (11)	0.0022 (9)	0.0004 (9)	0.0000 (9)
O2	0.0064 (12)	0.0057 (11)	0.0043 (10)	−0.0010 (9)	0.0007 (9)	0.0004 (9)
O3	0.0060 (12)	0.0054 (11)	0.0066 (12)	−0.0006 (9)	0.0025 (10)	0.0012 (9)
O4	0.0061 (11)	0.0066 (11)	0.0072 (11)	−0.0008 (9)	0.0040 (9)	−0.0014 (9)
O5	0.0042 (11)	0.0074 (11)	0.0052 (11)	−0.0002 (9)	0.0022 (9)	−0.0023 (9)
O6	0.0038 (11)	0.0091 (12)	0.0066 (11)	0.0000 (9)	0.0015 (9)	−0.0020 (9)
O7	0.0061 (11)	0.0060 (11)	0.0051 (10)	0.0013 (9)	0.0022 (9)	0.0019 (9)
O8	0.0033 (11)	0.0078 (12)	0.0070 (11)	−0.0020 (9)	0.0012 (9)	0.0013 (9)

Geometric parameters (Å, º)

Ce—O1^i	2.410 (3)	Mo2—Mo3	2.8282 (5)
Ce—O1^ii	2.443 (3)	Mo2—Ce^xi	3.3761 (4)
Ce—O4^iii	2.459 (3)	Mo3—O3	2.059 (3)
Ce—O7^ii	2.568 (3)	Mo3—O4^vii	2.069 (3)
Ce—O5^iv	2.648 (3)	Mo3—O2^viii	2.070 (3)
Ce—O3^v	2.709 (3)	Mo3—O6	2.070 (3)
Ce—O8^iii	2.713 (3)	Mo3—O8	2.140 (3)
Ce—O2^i	2.758 (3)	Mo3—Mo4^xii	2.6072 (5)
Ce—O6^iii	2.862 (3)	Mo3—Mo5^xiii	2.6726 (5)
Ce—O2^vi	2.930 (3)	Mo3—Mo5	2.7569 (5)
Ce—Mo2^ii	3.3761 (4)	Mo3—Mo1^ix	2.8111 (5)
Ce—Mo4^iv	3.4159 (4)	Mo3—Ce^xiv	3.6519 (4)
Mo1—O5^vii	2.040 (3)	Mo4—O5	2.059 (3)
Mo1—O7^viii	2.066 (3)	Mo4—O7^viii	2.062 (3)
Mo1—O4^vii	2.117 (3)	Mo4—O3^x	2.070 (3)
Mo1—O8	2.124 (3)	Mo4—O1^ix	2.080 (3)
Mo1—O8^ix	2.126 (3)	Mo4—O2^xv	2.099 (3)
Mo1—Mo2^ix	2.6851 (5)	Mo4—Mo3^x	2.6072 (5)
Mo1—Mo1^ix	2.6874 (7)	Mo4—Mo2^ix	2.7279 (5)
Mo1—Mo4	2.7906 (5)	Mo4—Mo5^x	2.7474 (5)
Mo1—Mo5^x	2.8086 (5)	Mo4—Mo5^ix	2.7594 (5)
Mo1—Mo3^ix	2.8111 (5)	Mo4—Ce^xvi	3.4159 (4)
Mo1—Mo2	2.9066 (5)	Mo5—O6^vii	2.038 (3)
Mo1—Mo3	3.0840 (5)	Mo5—O5^xvii	2.051 (3)
Mo2—O6^vii	1.997 (3)	Mo5—O2^viii	2.074 (3)
Mo2—O1	2.013 (3)	Mo5—O3^xiii	2.086 (3)
Mo2—O4^vii	2.057 (3)	Mo5—Mo3^xiii	2.6726 (5)
Mo2—O8^ix	2.112 (3)	Mo5—Mo4^xii	2.7474 (5)
Mo2—O7	2.138 (3)	Mo5—Mo4^ix	2.7594 (5)
Mo2—Mo1^ix	2.6851 (5)	Mo5—Mo1^xii	2.8086 (5)
Mo2—Mo4^ix	2.7279 (5)	Mo5—Mo5^xiii	2.8183 (6)
Mo2—Mo5	2.7579 (5)
Mo1^ix—O8—Ce^i	144.69 (15)	Mo3—O8—Ce^i	104.86 (12)

Symmetry codes: (i) x, −y+1/2, z−1/2; (ii) −x+1, y+1/2, −z+3/2; (iii) x, −y+1/2, z+1/2; (iv) −x+1, y+1/2, −z+1/2; (v) −x, y+1/2, −z+1/2; (vi) −x, y+1/2, −z+3/2; (vii) x, −y−1/2, z+1/2; (viii) x, −y−1/2, z−1/2; (ix) −x+1, −y, −z+1; (x) x+1, y, z; (xi) −x+1, y−1/2, −z+3/2; (xii) x−1, y, z; (xiii) −x, −y, −z+1; (xiv) x, y−1, z; (xv) x+1, −y−1/2, z−1/2; (xvi) −x+1, y−1/2, −z+1/2; (xvii) x−1, −y−1/2, z+1/2.

(PrMo5O8)

Crystal data

PrMo5O8	F(000) = 1332
Mr = 748.61	Dx = 7.754 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71070 Å
a = 7.5662 (1) Å	Cell parameters from 11309 reflections
b = 9.0569 (1) Å	θ = 1.0–37.8°
c = 9.9175 (1) Å	µ = 16.94 mm^−1
β = 109.3293 (7)°	T = 293 K
V = 641.30 (1) Å^3	Irregular plate, black
Z = 4	0.24 × 0.11 × 0.04 mm

Data collection

Nonius KappaCCD diffractometer	3411 independent reflections
Radiation source: fine-focus sealed tube	3329 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.091
ϕ scans (κ = 0) + additional ω scans	θmax = 37.8°, θmin = 2.9°
Absorption correction: gaussian '(Coppens, P., Leiserowitz, L. & Rabinovich, D. 1965)'	h = −12→12
Tmin = 0.090, Tmax = 0.524	k = −15→15
14762 measured reflections	l = −16→16

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.029	w = 1/[σ^2(Fo^2) + (0.0145P)^2 + 1.922P] where P = (Fo^2 + 2Fc^2)/3
wR(F^2) = 0.070	(Δ/σ)max = 0.002
S = 1.19	Δρmax = 2.45 e Å^−3
3411 reflections	Δρmin = −3.32 e Å^−3
128 parameters	Extinction correction: SHELXL, Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.0874 (12)

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq
Pr	0.26407 (2)	0.504028 (15)	0.536858 (16)	0.00703 (6)
Mo1	0.60429 (3)	−0.11548 (2)	0.48668 (2)	0.00438 (6)
Mo2	0.38377 (3)	−0.11796 (2)	0.67725 (2)	0.00447 (6)
Mo3	0.17258 (3)	−0.12700 (2)	0.38258 (2)	0.00375 (6)
Mo4	0.80778 (3)	−0.12994 (2)	0.29783 (2)	0.00364 (6)
Mo5	−0.00233 (3)	−0.12309 (2)	0.58646 (2)	0.00375 (6)
O1	0.3989 (3)	0.00591 (19)	0.8497 (2)	0.0059 (3)
O2	−0.0014 (3)	−0.2214 (2)	0.9331 (2)	0.0057 (3)
O3	−0.0146 (3)	0.00289 (19)	0.2304 (2)	0.0051 (3)
O4	0.3909 (3)	−0.2466 (2)	0.0128 (2)	0.0062 (3)
O5	0.7947 (3)	−0.2413 (2)	0.1138 (2)	0.0063 (3)
O6	0.2003 (3)	−0.2393 (2)	0.2087 (2)	0.0071 (3)
O7	0.6063 (3)	−0.2341 (2)	0.8299 (2)	0.0059 (3)
O8	0.3831 (3)	−0.0066 (2)	0.3275 (2)	0.0055 (3)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Pr	0.00619 (8)	0.00675 (8)	0.00800 (8)	−0.00036 (4)	0.00215 (5)	0.00049 (4)
Mo1	0.00409 (10)	0.00307 (10)	0.00532 (10)	0.00013 (5)	0.00065 (7)	−0.00010 (5)
Mo2	0.00444 (10)	0.00380 (10)	0.00452 (10)	−0.00041 (6)	0.00060 (7)	0.00059 (6)
Mo3	0.00380 (10)	0.00336 (9)	0.00415 (10)	0.00010 (5)	0.00141 (7)	−0.00021 (6)
Mo4	0.00361 (10)	0.00325 (9)	0.00412 (10)	−0.00024 (5)	0.00137 (7)	−0.00031 (6)
Mo5	0.00379 (10)	0.00313 (10)	0.00425 (10)	−0.00006 (5)	0.00123 (7)	0.00023 (5)
O1	0.0068 (8)	0.0053 (8)	0.0046 (8)	0.0018 (5)	0.0006 (6)	0.0001 (5)
O2	0.0066 (8)	0.0042 (7)	0.0062 (7)	−0.0006 (5)	0.0021 (6)	−0.0005 (6)
O3	0.0052 (8)	0.0043 (7)	0.0056 (8)	−0.0001 (5)	0.0017 (6)	0.0006 (5)
O4	0.0056 (8)	0.0058 (8)	0.0079 (8)	−0.0008 (5)	0.0030 (6)	−0.0017 (6)
O5	0.0059 (8)	0.0058 (7)	0.0074 (8)	0.0001 (6)	0.0023 (6)	−0.0018 (6)
O6	0.0055 (8)	0.0078 (8)	0.0075 (8)	−0.0002 (6)	0.0014 (6)	−0.0035 (6)
O7	0.0056 (8)	0.0057 (7)	0.0064 (7)	0.0019 (6)	0.0020 (6)	0.0016 (6)
O8	0.0038 (8)	0.0065 (8)	0.0067 (8)	−0.0013 (5)	0.0023 (6)	0.0011 (5)

Geometric parameters (Å, º)

Pr—O1^i	2.397 (2)	Mo2—Mo3	2.8300 (3)
Pr—O1^ii	2.423 (2)	Mo2—Pr^xi	3.3702 (3)
Pr—O4^iii	2.440 (2)	Mo3—O3	2.062 (2)
Pr—O7^ii	2.550 (2)	Mo3—O6	2.0715 (19)
Pr—O5^iv	2.632 (2)	Mo3—O4^vii	2.072 (2)
Pr—O3^v	2.697 (2)	Mo3—O2^viii	2.075 (2)
Pr—O8^iii	2.721 (2)	Mo3—O8	2.144 (2)
Pr—O2^i	2.757 (2)	Mo3—Mo4^xii	2.6057 (3)
Pr—O6^iii	2.868 (2)	Mo3—Mo5^xiii	2.6731 (3)
Pr—O2^vi	2.933 (2)	Mo3—Mo5	2.7591 (3)
Pr—Mo2^ii	3.3702 (3)	Mo3—Mo1^ix	2.8116 (3)
Pr—Mo4^iv	3.4045 (3)	Mo3—Pr^xiv	3.6451 (3)
Mo1—O5^vii	2.036 (2)	Mo4—O5	2.058 (2)
Mo1—O7^viii	2.071 (2)	Mo4—O7^viii	2.065 (2)
Mo1—O8^ix	2.124 (2)	Mo4—O3^x	2.073 (2)
Mo1—O4^vii	2.124 (2)	Mo4—O1^ix	2.082 (2)
Mo1—O8	2.125 (2)	Mo4—O2^xv	2.101 (2)
Mo1—Mo1^ix	2.6855 (4)	Mo4—Mo3^x	2.6057 (3)
Mo1—Mo2^ix	2.6867 (3)	Mo4—Mo2^ix	2.7275 (3)
Mo1—Mo4	2.7937 (3)	Mo4—Mo5^x	2.7458 (3)
Mo1—Mo5^x	2.8094 (3)	Mo4—Mo5^ix	2.7599 (3)
Mo1—Mo3^ix	2.8116 (3)	Mo4—Pr^xvi	3.4045 (3)
Mo1—Mo2	2.9058 (3)	Mo5—O6^vii	2.035 (2)
Mo1—Mo3	3.0845 (3)	Mo5—O5^xvii	2.054 (2)
Mo2—O6^vii	1.996 (2)	Mo5—O2^viii	2.074 (2)
Mo2—O1	2.017 (2)	Mo5—O3^xiii	2.085 (2)
Mo2—O4^vii	2.056 (2)	Mo5—Mo3^xiii	2.6731 (3)
Mo2—O8^ix	2.108 (2)	Mo5—Mo4^xii	2.7458 (3)
Mo2—O7	2.1321 (19)	Mo5—Mo4^ix	2.7599 (3)
Mo2—Mo1^ix	2.6867 (3)	Mo5—Mo1^xii	2.8094 (3)
Mo2—Mo4^ix	2.7275 (3)	Mo5—Mo5^xiii	2.8201 (4)
Mo2—Mo5	2.7579 (3)
O1^i—Pr—O1^ii	72.99 (8)	O1^i—Pr—O4^iii	71.11 (6)

Symmetry codes: (i) x, −y+1/2, z−1/2; (ii) −x+1, y+1/2, −z+3/2; (iii) x, −y+1/2, z+1/2; (iv) −x+1, y+1/2, −z+1/2; (v) −x, y+1/2, −z+1/2; (vi) −x, y+1/2, −z+3/2; (vii) x, −y−1/2, z+1/2; (viii) x, −y−1/2, z−1/2; (ix) −x+1, −y, −z+1; (x) x+1, y, z; (xi) −x+1, y−1/2, −z+3/2; (xii) x−1, y, z; (xiii) −x, −y, −z+1; (xiv) x, y−1, z; (xv) x+1, −y−1/2, z−1/2; (xvi) −x+1, y−1/2, −z+1/2; (xvii) x−1, −y−1/2, z+1/2.

(NdMo5O8)

Crystal data

NdMo5O8	F(000) = 1336
Mr = 751.94	Dx = 7.822 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71070 Å
a = 7.5606 (1) Å	Cell parameters from 12284 reflections
b = 9.0392 (1) Å	θ = 1.0–37.8°
c = 9.9082 (2) Å	µ = 17.52 mm^−1
β = 109.4513 (7)°	T = 293 K
V = 638.50 (2) Å^3	Irregular plate, black
Z = 4	0.13 × 0.13 × 0.08 mm

Data collection

Nonius KappaCCD diffractometer	3404 independent reflections
Radiation source: fine-focus sealed tube	3193 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.052
ϕ scans (κ = 0) + additional ω scans	θmax = 37.8°, θmin = 2.9°
Absorption correction: multi-scan r.h. blessing, acta cryst. (1995), a51, 33-38	h = −12→12
Tmin = 0.113, Tmax = 0.252	k = −15→15
17433 measured reflections	l = −14→16

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.024	w = 1/[σ^2(Fo^2) + (0.P)^2 + 2.8951P] where P = (Fo^2 + 2Fc^2)/3
wR(F^2) = 0.055	(Δ/σ)max = 0.001
S = 1.16	Δρmax = 1.63 e Å^−3
3404 reflections	Δρmin = −1.82 e Å^−3
128 parameters	Extinction correction: SHELXL, Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.0185 (3)

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq
Nd	0.26519 (2)	0.504029 (18)	0.535724 (17)	0.00884 (5)
Mo1	0.60423 (3)	−0.11559 (3)	0.48678 (3)	0.00600 (5)
Mo2	0.38404 (3)	−0.11803 (3)	0.67733 (3)	0.00602 (5)
Mo3	0.17229 (4)	−0.12707 (3)	0.38235 (3)	0.00532 (5)
Mo4	0.80740 (3)	−0.13019 (3)	0.29785 (3)	0.00517 (5)
Mo5	−0.00215 (3)	−0.12333 (3)	0.58651 (3)	0.00528 (5)
O1	0.3997 (3)	0.0063 (2)	0.8502 (2)	0.0081 (4)
O2	−0.0013 (3)	−0.2210 (2)	0.9331 (2)	0.0071 (3)
O3	−0.0162 (3)	0.0029 (2)	0.2297 (2)	0.0071 (3)
O4	0.3908 (3)	−0.2461 (3)	0.0127 (2)	0.0077 (4)
O5	0.7948 (3)	−0.2405 (2)	0.1137 (2)	0.0076 (4)
O6	0.2006 (3)	−0.2387 (3)	0.2084 (2)	0.0082 (4)
O7	0.6067 (3)	−0.2336 (2)	0.8304 (2)	0.0071 (3)
O8	0.3828 (3)	−0.0067 (2)	0.3273 (2)	0.0076 (4)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Nd	0.00757 (8)	0.00914 (8)	0.00971 (8)	−0.00033 (5)	0.00275 (6)	0.00051 (5)
Mo1	0.00541 (10)	0.00524 (10)	0.00667 (11)	0.00011 (6)	0.00112 (8)	−0.00015 (7)
Mo2	0.00570 (10)	0.00585 (10)	0.00584 (10)	−0.00047 (7)	0.00102 (8)	0.00058 (7)
Mo3	0.00516 (10)	0.00549 (10)	0.00537 (10)	0.00009 (7)	0.00185 (8)	−0.00022 (7)
Mo4	0.00488 (10)	0.00532 (10)	0.00529 (10)	−0.00015 (6)	0.00167 (8)	−0.00032 (7)
Mo5	0.00510 (10)	0.00511 (10)	0.00553 (11)	−0.00003 (6)	0.00166 (8)	0.00024 (7)
O1	0.0081 (9)	0.0091 (9)	0.0062 (9)	0.0010 (7)	0.0012 (7)	−0.0002 (7)
O2	0.0077 (8)	0.0065 (8)	0.0073 (8)	−0.0004 (6)	0.0025 (7)	0.0005 (7)
O3	0.0070 (9)	0.0076 (9)	0.0063 (9)	−0.0003 (6)	0.0016 (7)	0.0001 (7)
O4	0.0073 (8)	0.0076 (9)	0.0091 (9)	−0.0013 (6)	0.0039 (7)	−0.0008 (7)
O5	0.0069 (8)	0.0074 (9)	0.0088 (9)	0.0008 (6)	0.0029 (7)	−0.0017 (7)
O6	0.0064 (8)	0.0095 (9)	0.0081 (9)	−0.0005 (7)	0.0016 (7)	−0.0033 (7)
O7	0.0066 (8)	0.0072 (8)	0.0071 (8)	0.0023 (6)	0.0020 (7)	0.0018 (7)
O8	0.0064 (8)	0.0086 (9)	0.0079 (9)	−0.0004 (6)	0.0026 (7)	0.0013 (7)

Geometric parameters (Å, º)

Nd—O1^i	2.380 (2)	Mo2—Mo3	2.8277 (4)
Nd—O1^ii	2.406 (2)	Mo2—Nd^xi	3.3634 (3)
Nd—O4^iii	2.427 (2)	Mo3—O3	2.064 (2)
Nd—O7^ii	2.540 (2)	Mo3—O6	2.069 (2)
Nd—O5^iv	2.615 (2)	Mo3—O4^vii	2.071 (2)
Nd—O3^v	2.676 (2)	Mo3—O2^viii	2.074 (2)
Nd—O8^iii	2.725 (2)	Mo3—O8	2.143 (2)
Nd—O2^i	2.753 (2)	Mo3—Mo4^xii	2.6028 (3)
Nd—O6^iii	2.868 (2)	Mo3—Mo5^xiii	2.6715 (3)
Nd—O2^vi	2.937 (2)	Mo3—Mo5	2.7586 (3)
Nd—Mo2^ii	3.3634 (3)	Mo3—Mo1^ix	2.8086 (3)
Nd—Mo4^iv	3.3895 (3)	Mo3—Nd^xiv	3.6347 (3)
Mo1—O5^vii	2.036 (2)	Mo4—O5	2.053 (2)
Mo1—O7^viii	2.068 (2)	Mo4—O7^viii	2.061 (2)
Mo1—O8^ix	2.123 (2)	Mo4—O3^x	2.069 (2)
Mo1—O8	2.123 (2)	Mo4—O1^ix	2.080 (2)
Mo1—O4^vii	2.123 (2)	Mo4—O2^xv	2.099 (2)
Mo1—Mo1^ix	2.6822 (5)	Mo4—Mo3^x	2.6028 (3)
Mo1—Mo2^ix	2.6847 (4)	Mo4—Mo2^ix	2.7253 (3)
Mo1—Mo4	2.7922 (3)	Mo4—Mo5^x	2.7413 (3)
Mo1—Mo5^x	2.8070 (3)	Mo4—Mo5^ix	2.7584 (3)
Mo1—Mo3^ix	2.8086 (3)	Mo4—Nd^xvi	3.3895 (3)
Mo1—Mo2	2.9034 (3)	Mo5—O6^vii	2.032 (2)
Mo1—Mo3	3.0815 (4)	Mo5—O5^xvii	2.054 (2)
Mo2—O6^vii	1.995 (2)	Mo5—O2^viii	2.073 (2)
Mo2—O1	2.019 (2)	Mo5—O3^xiii	2.087 (2)
Mo2—O4^vii	2.056 (2)	Mo5—Mo3^xiii	2.6715 (3)
Mo2—O8^ix	2.106 (2)	Mo5—Mo4^xii	2.7413 (3)
Mo2—O7	2.127 (2)	Mo5—Mo4^ix	2.7584 (3)
Mo2—Mo1^ix	2.6847 (4)	Mo5—Mo1^xii	2.8070 (3)
Mo2—Mo4^ix	2.7253 (3)	Mo5—Mo5^xiii	2.8192 (5)
Mo2—Mo5	2.7545 (3)
O1^i—Nd—O1^ii	73.10 (9)	O1^ii—Nd—O4^iii	69.67 (7)
O1^i—Nd—O4^iii	71.44 (7)

Symmetry codes: (i) x, −y+1/2, z−1/2; (ii) −x+1, y+1/2, −z+3/2; (iii) x, −y+1/2, z+1/2; (iv) −x+1, y+1/2, −z+1/2; (v) −x, y+1/2, −z+1/2; (vi) −x, y+1/2, −z+3/2; (vii) x, −y−1/2, z+1/2; (viii) x, −y−1/2, z−1/2; (ix) −x+1, −y, −z+1; (x) x+1, y, z; (xi) −x+1, y−1/2, −z+3/2; (xii) x−1, y, z; (xiii) −x, −y, −z+1; (xiv) x, y−1, z; (xv) x+1, −y−1/2, z−1/2; (xvi) −x+1, y−1/2, −z+1/2; (xvii) x−1, −y−1/2, z+1/2.

(SmMo5O8)

Crystal data

SmMo5O8	F(000) = 1344
Mr = 758.05	Dx = 7.900 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71070 Å
a = 7.5620 (2) Å	Cell parameters from 6858 reflections
b = 9.0197 (2) Å	θ = 2.9–37.8°
c = 9.9226 (2) Å	µ = 18.62 mm^−1
β = 109.6643 (12)°	T = 293 K
V = 637.32 (3) Å^3	Irregular plate, black
Z = 4	0.09 × 0.06 × 0.03 mm

Data collection

Nonius KappaCCD diffractometer	3395 independent reflections
Radiation source: fine-focus sealed tube	2569 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.075
ϕ scans (κ = 0) + additional ω scans	θmax = 37.8°, θmin = 3.1°
Absorption correction: multi-scan r.h. blessing, acta cryst. (1995), a51, 33-38	h = −12→13
Tmin = 0.378, Tmax = 0.513	k = −15→15
15935 measured reflections	l = −17→15

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.039	w = 1/[σ^2(Fo^2) + (0.0313P)^2] where P = (Fo^2 + 2Fc^2)/3
wR(F^2) = 0.087	(Δ/σ)max = 0.001
S = 1.03	Δρmax = 4.49 e Å^−3
3395 reflections	Δρmin = −2.89 e Å^−3
128 parameters	Extinction correction: SHELXL, Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.00439 (19)

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq
Sm	0.26744 (4)	0.50342 (3)	0.53268 (3)	0.00998 (8)
Mo1	0.60408 (6)	−0.11595 (4)	0.48701 (4)	0.00656 (9)
Mo2	0.38458 (6)	−0.11813 (4)	0.67749 (4)	0.00645 (9)
Mo3	0.17205 (6)	−0.12713 (4)	0.38201 (4)	0.00592 (9)
Mo4	0.80693 (6)	−0.13060 (4)	0.29808 (4)	0.00578 (9)
Mo5	−0.00176 (6)	−0.12369 (4)	0.58656 (4)	0.00578 (8)
O1	0.4009 (5)	0.0061 (3)	0.8499 (3)	0.0080 (6)
O2	−0.0011 (5)	−0.2200 (4)	0.9337 (3)	0.0077 (6)
O3	−0.0179 (5)	0.0032 (3)	0.2297 (3)	0.0067 (6)
O4	0.3902 (5)	−0.2445 (4)	0.0128 (3)	0.0097 (7)
O5	0.7952 (5)	−0.2394 (4)	0.1140 (3)	0.0085 (6)
O6	0.2008 (5)	−0.2382 (4)	0.2085 (3)	0.0105 (7)
O7	0.6078 (5)	−0.2316 (4)	0.8319 (3)	0.0074 (6)
O8	0.3824 (5)	−0.0060 (3)	0.3265 (4)	0.0080 (6)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Sm	0.00893 (13)	0.01056 (13)	0.01018 (13)	−0.00034 (8)	0.00288 (9)	0.00063 (8)
Mo1	0.00622 (19)	0.00606 (18)	0.00656 (18)	0.00017 (13)	0.00102 (14)	−0.00023 (12)
Mo2	0.00644 (18)	0.00642 (18)	0.00563 (17)	−0.00039 (13)	0.00091 (13)	0.00049 (13)
Mo3	0.00645 (18)	0.00621 (18)	0.00491 (17)	0.00024 (13)	0.00165 (13)	−0.00006 (13)
Mo4	0.00588 (18)	0.00619 (17)	0.00511 (17)	−0.00021 (13)	0.00164 (13)	−0.00030 (12)
Mo5	0.00617 (19)	0.00582 (17)	0.00506 (17)	−0.00013 (13)	0.00150 (13)	0.00032 (13)
O1	0.0100 (17)	0.0088 (16)	0.0047 (14)	0.0021 (12)	0.0018 (12)	0.0004 (11)
O2	0.0104 (16)	0.0056 (14)	0.0058 (14)	−0.0018 (12)	0.0010 (12)	−0.0011 (11)
O3	0.0080 (16)	0.0072 (15)	0.0048 (14)	−0.0023 (11)	0.0019 (12)	−0.0010 (11)
O4	0.0096 (17)	0.0104 (16)	0.0091 (15)	−0.0005 (13)	0.0033 (13)	0.0005 (12)
O5	0.0075 (16)	0.0087 (15)	0.0085 (15)	−0.0008 (12)	0.0015 (12)	−0.0027 (12)
O6	0.0103 (17)	0.0114 (16)	0.0099 (16)	−0.0024 (13)	0.0034 (13)	−0.0048 (13)
O7	0.0092 (16)	0.0083 (14)	0.0047 (13)	0.0043 (12)	0.0023 (12)	0.0029 (11)
O8	0.0049 (15)	0.0106 (16)	0.0072 (14)	0.0016 (12)	0.0002 (11)	0.0013 (12)

Geometric parameters (Å, º)

Sm—O1^i	2.355 (3)	Mo2—Mo5	2.7527 (6)
Sm—O1^ii	2.384 (4)	Mo2—Mo3	2.8309 (6)
Sm—O4^iii	2.398 (4)	Mo2—Sm^xi	3.3621 (5)
Sm—O7^ii	2.517 (3)	Mo3—O6	2.065 (3)
Sm—O5^iv	2.584 (3)	Mo3—O3	2.066 (3)
Sm—O3^v	2.652 (3)	Mo3—O4^vii	2.075 (3)
Sm—O8^iii	2.748 (3)	Mo3—O2^viii	2.081 (3)
Sm—O2^i	2.750 (3)	Mo3—O8	2.148 (3)
Sm—O6^iii	2.894 (3)	Mo3—Mo4^xii	2.6020 (6)
Sm—O2^vi	2.947 (3)	Mo3—Mo5^xiii	2.6727 (6)
Sm—Mo2^ii	3.3621 (5)	Mo3—Mo5	2.7647 (5)
Sm—Mo4^iv	3.3626 (4)	Mo3—Mo1^ix	2.8073 (6)
Mo1—O5^vii	2.038 (3)	Mo3—Sm^xiv	3.6241 (5)
Mo1—O7^viii	2.071 (3)	Mo4—O5	2.049 (3)
Mo1—O8^ix	2.126 (3)	Mo4—O7^viii	2.065 (3)
Mo1—O8	2.129 (3)	Mo4—O3^x	2.068 (3)
Mo1—O4^vii	2.132 (4)	Mo4—O1^ix	2.082 (3)
Mo1—Mo1^ix	2.6818 (8)	Mo4—O2^xv	2.102 (3)
Mo1—Mo2^ix	2.6876 (5)	Mo4—Mo3^x	2.6020 (6)
Mo1—Mo4	2.7964 (5)	Mo4—Mo2^ix	2.7249 (6)
Mo1—Mo3^ix	2.8073 (6)	Mo4—Mo5^x	2.7393 (5)
Mo1—Mo5^x	2.8077 (5)	Mo4—Mo5^ix	2.7580 (6)
Mo1—Mo2	2.9050 (6)	Mo4—Sm^xvi	3.3626 (4)
Mo1—Mo3	3.0787 (6)	Mo5—O6^vii	2.028 (3)
Mo2—O6^vii	1.998 (3)	Mo5—O5^xvii	2.059 (3)
Mo2—O1	2.014 (3)	Mo5—O2^viii	2.072 (3)
Mo2—O4^vii	2.063 (3)	Mo5—O3^xiii	2.085 (3)
Mo2—O8^ix	2.100 (3)	Mo5—Mo3^xiii	2.6727 (6)
Mo2—O7	2.122 (3)	Mo5—Mo4^xii	2.7393 (5)
Mo2—Mo1^ix	2.6876 (5)	Mo5—Mo4^ix	2.7580 (6)
Mo2—Mo4^ix	2.7249 (6)	Mo5—Mo1^xii	2.8077 (5)
O1^i—Sm—O1^ii	73.97 (12)	O1^i—Sm—O4^iii	72.04 (10)

Symmetry codes: (i) x, −y+1/2, z−1/2; (ii) −x+1, y+1/2, −z+3/2; (iii) x, −y+1/2, z+1/2; (iv) −x+1, y+1/2, −z+1/2; (v) −x, y+1/2, −z+1/2; (vi) −x, y+1/2, −z+3/2; (vii) x, −y−1/2, z+1/2; (viii) x, −y−1/2, z−1/2; (ix) −x+1, −y, −z+1; (x) x+1, y, z; (xi) −x+1, y−1/2, −z+3/2; (xii) x−1, y, z; (xiii) −x, −y, −z+1; (xiv) x, y−1, z; (xv) x+1, −y−1/2, z−1/2; (xvi) −x+1, y−1/2, −z+1/2; (xvii) x−1, −y−1/2, z+1/2.

(EuMo5O8)

Crystal data

EuMo5O8	F(000) = 1348
Mr = 759.66	Dx = 7.750 Mg m^−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71070 Å
a = 7.5554 (1) Å	Cell parameters from 12022 reflections
b = 9.1622 (2) Å	θ = 1.0–37.8°
c = 9.9685 (2) Å	µ = 18.84 mm^−1
β = 109.3560 (9)°	T = 293 K
V = 651.06 (2) Å^3	Irregular plate, black
Z = 4	0.10 × 0.07 × 0.05 mm

Data collection

Nonius KappaCCD diffractometer	3471 independent reflections
Radiation source: fine-focus sealed tube	3034 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.031
ϕ scans (κ = 0) + additional ω scans	θmax = 37.8°, θmin = 2.9°
Absorption correction: multi-scan r.h. blessing, acta cryst. (1995), a51, 33-38	h = 0→13
Tmin = 0.168, Tmax = 0.358	k = 0→15
6545 measured reflections	l = −16→16

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.032	w = 1/[σ^2(Fo^2) + (0.0324P)^2 + 2.9295P] where P = (Fo^2 + 2Fc^2)/3
wR(F^2) = 0.077	(Δ/σ)max = 0.001
S = 1.06	Δρmax = 3.59 e Å^−3
3471 reflections	Δρmin = −4.08 e Å^−3
128 parameters	Extinction correction: SHELXL, Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
0 restraints	Extinction coefficient: 0.0189 (4)

Special details

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 (Ų)

	x	y	z	Uiso*/Ueq
Eu	0.25260 (3)	0.50439 (2)	0.53847 (2)	0.00844 (6)
Mo1	0.61048 (4)	−0.11430 (3)	0.48321 (3)	0.00357 (7)
Mo2	0.38030 (4)	−0.11665 (3)	0.68171 (3)	0.00373 (7)
Mo3	0.17803 (4)	−0.12587 (3)	0.38692 (3)	0.00352 (7)
Mo4	0.81246 (4)	−0.13160 (3)	0.29888 (3)	0.00356 (7)
Mo5	−0.00146 (4)	−0.12247 (3)	0.58633 (3)	0.00343 (7)
O1	0.3947 (4)	0.0057 (3)	0.8401 (3)	0.0061 (5)
O2	0.0046 (4)	−0.2247 (3)	0.9347 (3)	0.0059 (4)
O3	−0.0077 (4)	0.0004 (3)	0.2363 (3)	0.0068 (5)
O4	0.4015 (4)	−0.2558 (3)	0.0200 (3)	0.0057 (5)
O5	0.7988 (4)	−0.2484 (3)	0.1175 (3)	0.0055 (5)
O6	0.2015 (4)	−0.2470 (3)	0.2162 (3)	0.0064 (5)
O7	0.6030 (4)	−0.2405 (3)	0.8267 (3)	0.0051 (4)
O8	0.3864 (4)	−0.0015 (3)	0.3330 (3)	0.0058 (5)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Eu	0.00776 (10)	0.00835 (10)	0.00840 (10)	0.00025 (6)	0.00159 (7)	0.00039 (6)
Mo1	0.00322 (12)	0.00361 (13)	0.00387 (13)	−0.00012 (9)	0.00118 (10)	0.00004 (9)
Mo2	0.00304 (12)	0.00396 (13)	0.00408 (13)	0.00029 (9)	0.00103 (10)	0.00020 (9)
Mo3	0.00348 (13)	0.00383 (13)	0.00346 (13)	0.00001 (9)	0.00141 (10)	−0.00017 (9)
Mo4	0.00314 (13)	0.00383 (13)	0.00373 (13)	−0.00025 (9)	0.00115 (10)	−0.00037 (9)
Mo5	0.00305 (13)	0.00346 (13)	0.00382 (13)	0.00023 (8)	0.00117 (10)	0.00018 (9)
O1	0.0052 (11)	0.0056 (12)	0.0061 (11)	0.0018 (8)	−0.0001 (9)	−0.0004 (8)
O2	0.0042 (10)	0.0067 (11)	0.0061 (10)	0.0004 (8)	0.0011 (9)	0.0000 (9)
O3	0.0069 (11)	0.0071 (12)	0.0067 (12)	−0.0010 (9)	0.0025 (10)	0.0006 (8)
O4	0.0040 (11)	0.0065 (11)	0.0070 (11)	−0.0011 (8)	0.0022 (9)	−0.0010 (9)
O5	0.0030 (10)	0.0062 (11)	0.0071 (11)	0.0004 (8)	0.0016 (9)	−0.0029 (9)
O6	0.0059 (11)	0.0074 (12)	0.0057 (11)	0.0000 (9)	0.0016 (9)	−0.0029 (9)
O7	0.0045 (11)	0.0056 (11)	0.0050 (10)	0.0019 (9)	0.0013 (9)	0.0013 (9)
O8	0.0058 (11)	0.0061 (12)	0.0067 (11)	−0.0002 (8)	0.0039 (9)	−0.0001 (8)

Bond lengths (Å)

Eu—O1^i	2.535 (3)	Mo2—Mo3	2.8286 (4)
Eu—O1^ii	2.545 (3)	Mo2—Eu^xi	3.4022 (4)
Eu—O4^iii	2.596 (3)	Mo2—Eu^xii	3.7566 (4)
Eu—O7^i	2.657 (3)	Mo3—O3	2.041 (3)
Eu—O2^ii	2.715 (3)	Mo3—O2^viii	2.057 (3)
Eu—O5^iv	2.744 (3)	Mo3—O4^vii	2.074 (3)
Eu—O3^v	2.751 (3)	Mo3—O6	2.087 (3)
Eu—O8^iii	2.771 (3)	Mo3—O8	2.151 (3)
Eu—O2^vi	2.932 (3)	Mo3—Mo4^xiii	2.6067 (4)
Eu—O6^iii	2.947 (3)	Mo3—Mo5^xiv	2.6951 (4)
Eu—Mo2^i	3.4022 (4)	Mo3—Mo5	2.7529 (4)
Eu—Mo4^iv	3.4651 (4)	Mo3—Mo1^ix	2.7749 (4)
Mo1—O5^vii	2.034 (3)	Mo3—Eu^xii	3.6758 (4)
Mo1—O7^viii	2.037 (3)	Mo4—O7^viii	2.060 (3)
Mo1—O4^vii	2.105 (3)	Mo4—O3^x	2.064 (3)
Mo1—O8^ix	2.110 (3)	Mo4—O1^ix	2.065 (3)
Mo1—O8	2.120 (3)	Mo4—O5	2.074 (3)
Mo1—Mo2^ix	2.6947 (4)	Mo4—O2^xv	2.091 (3)
Mo1—Mo4	2.7549 (4)	Mo4—Mo3^x	2.6067 (4)
Mo1—Mo1^ix	2.7670 (6)	Mo4—Mo2^ix	2.7420 (4)
Mo1—Mo5^x	2.7678 (4)	Mo4—Mo5^x	2.7430 (4)
Mo1—Mo3^ix	2.7749 (4)	Mo4—Mo5^ix	2.7720 (4)
Mo1—Mo2	3.0366 (4)	Mo4—Eu^xvi	3.4651 (4)
Mo1—Mo3	3.0869 (5)	Mo5—O5^xvii	2.021 (3)
Mo2—O1	1.910 (3)	Mo5—O6^vii	2.035 (3)
Mo2—O6^vii	1.953 (3)	Mo5—O2^viii	2.072 (3)
Mo2—O4^vii	2.040 (3)	Mo5—O3^xiv	2.074 (3)
Mo2—O8^ix	2.115 (3)	Mo5—Mo3^xiv	2.6951 (4)
Mo2—O7	2.144 (3)	Mo5—Mo4^xiii	2.7430 (4)
Mo2—Mo1^ix	2.6947 (4)	Mo5—Mo1^xiii	2.7678 (4)
Mo2—Mo5	2.7218 (4)	Mo5—Mo4^ix	2.7720 (4)
Mo2—Mo4^ix	2.7420 (4)	Mo5—Mo5^xiv	2.8327 (6)

Symmetry codes: (i) −x+1, y+1/2, −z+3/2; (ii) x, −y+1/2, z−1/2; (iii) x, −y+1/2, z+1/2; (iv) −x+1, y+1/2, −z+1/2; (v) −x, y+1/2, −z+1/2; (vi) −x, y+1/2, −z+3/2; (vii) x, −y−1/2, z+1/2; (viii) x, −y−1/2, z−1/2; (ix) −x+1, −y, −z+1; (x) x+1, y, z; (xi) −x+1, y−1/2, −z+3/2; (xii) x, y−1, z; (xiii) x−1, y, z; (xiv) −x, −y, −z+1; (xv) x+1, −y−1/2, z−1/2; (xvi) −x+1, y−1/2, −z+1/2; (xvii) x−1, −y−1/2, z+1/2.