Tetra-sodium (dihydrogenhepta-oxido-digermanato)bis-(dihydrogentetra-oxido-germanato)dicopper(II) monohydrate.

In the hydro/solvothermally synthesized title compound, Na(4)[Cu(2)(H(2)Ge(2)O(7))(H(2)GeO(4))(2)]·H(2)O, the framework building units include CuO(4), GeO(2)(OH)(2) and GeO(3)(OH) tetra-hedra, the latter being condensed into H(2)Ge(2)O(7) (4-) dimers. All the tetra-hedra are connected by corner-sharing into four-membered-ring (4MR) secondary building units containing two CuO(4), one GeO(2)(OH)(2) and one GeO(3)(OH) entity. The 4MRs form chains by corner-sharing the Cu unit and adjacent chains are linked by H(2)Ge(2)O(7) (4-) dimers, generating layers containing ten-membered rings. Three sodium cations (one with site symmetry and one with site symmetry 2) and a water mol-ecule (O-atom site symmetry 2) complete the structure. A network of O-H⋯O hydrogen bonds helps to consolidate the packing.

Related literature

For related structures, see: Bu et al. (2000 ▶); Cascales et al. (1999 ▶); Hartman & Kevan (1999 ▶); Julius et al. (2003 ▶); Li et al. (2000 ▶); O’Keeffe & Yaghi (1999 ▶); Whitfield et al. (2003 ▶).

Experimental

Crystal data

Na4[Cu2(H2Ge2O7)(H2GeO4)2]·H2O

M = 773.56

Orthorhombic,

a = 13.041 (3) Å

b = 8.7440 (17) Å

c = 12.975 (3) Å

V = 1479.6 (6) Å3

Z = 4

Mo Kα radiation

μ = 11.05 mm−1

T = 293 K

0.20 × 0.15 × 0.05 mm

Data collection

Stoe IPDS diffractometer

Absorption correction: numerical (X-RED; Stoe & Cie, 1997 ▶) T min = 0.152, T max = 0.582

9596 measured reflections

1441 independent reflections

1038 reflections with I > 2σ(I)

R int = 0.099

Refinement

R[F 2 > 2σ(F 2)] = 0.041

wR(F 2) = 0.118

S = 1.03

1441 reflections

129 parameters

1 restraint

H atoms treated by a mixture of independent and constrained refinement

Δρmax = 2.11 e Å−3

Δρmin = −1.17 e Å−3

Data collection: EXPOSURE in IPDS Software (Stoe & Cie, 1997 ▶); cell refinement: CELL in IPDS Software; data reduction: INTEGRATE in IPDS Software; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: DIAMOND (Brandenburg, 2000 ▶); software used to prepare material for publication: SHELXL97.

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536809007715/hb2913sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536809007715/hb2913Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Na4[Cu2(H2Ge2O7)(H2GeO4)2]·H2O	F(000) = 1464
Mr = 773.56	Dx = 3.472 Mg m−3
Orthorhombic, Pbcn	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2n 2ab	Cell parameters from 2000 reflections
a = 13.041 (3) Å	θ = 2.8–26.0°
b = 8.7440 (17) Å	µ = 11.05 mm−1
c = 12.975 (3) Å	T = 293 K
V = 1479.6 (6) Å3	Block, dark blue
Z = 4	0.20 × 0.15 × 0.05 mm

Stoe IPDS diffractometer	1441 independent reflections
Radiation source: fine-focus sealed tube	1038 reflections with I > 2σ(I)
graphite	Rint = 0.099
Detector resolution: 6.0 pixels mm-1	θmax = 26.0°, θmin = 2.8°
φ–oscillation, φ–incr.=1.8°, 100 exposure scans	h = −16→15
Absorption correction: numerical (X-RED; Stoe & Cie, 1997)	k = −10→10
Tmin = 0.152, Tmax = 0.582	l = −15→15
9596 measured reflections

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)] = 0.041	Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.118	H atoms treated by a mixture of independent and constrained refinement
S = 1.02	w = 1/[σ2(Fo2) + (0.076P)2] where P = (Fo2 + 2Fc2)/3
1441 reflections	(Δ/σ)max = 0.001
129 parameters	Δρmax = 2.11 e Å−3
1 restraint	Δρmin = −1.16 e Å−3

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.

	x	y	z	Uiso*/Ueq
Ge1	0.12245 (4)	0.12598 (6)	0.00099 (3)	0.0080 (2)
Ge2	0.37958 (4)	0.11778 (5)	0.25132 (4)	0.0076 (2)
Cu1	0.25095 (4)	0.37556 (6)	0.12703 (4)	0.0059 (2)
Na1	0.5000	0.0000	0.5000	0.0192 (8)
Na2	0.5000	0.4894 (4)	0.2500	0.0183 (8)
Na3	0.14907 (19)	0.2426 (3)	0.37481 (16)	0.0160 (5)
O1	0.1236 (3)	−0.0089 (4)	0.0976 (3)	0.0112 (9)
O2	0.1320 (3)	0.0301 (5)	−0.1209 (3)	0.0133 (8)
H2	0.0851	0.0580	−0.1585	0.070 (18)*
O3	0.0009 (3)	0.2188 (5)	0.0010 (3)	0.0137 (9)
H3	−0.0382	0.1736	−0.0380	0.070 (18)*
O4	0.2169 (3)	0.2639 (5)	0.0013 (3)	0.0108 (8)
O5	0.3686 (3)	0.0205 (5)	0.3725 (3)	0.0140 (9)
H5	0.3402	0.0765	0.4144	0.070 (18)*
O6	0.5000	0.2115 (6)	0.2500	0.0106 (11)
O7	0.1210 (3)	0.4809 (4)	0.1556 (3)	0.0121 (8)
O8	0.2863 (3)	0.2583 (4)	0.2509 (3)	0.0105 (7)
O1W	0.0000	0.2609 (7)	0.2500	0.0170 (12)
H1	0.023 (5)	0.333 (6)	0.212 (5)	0.020*

	U11	U22	U33	U12	U13	U23
Ge1	0.0107 (4)	0.0072 (4)	0.0060 (3)	−0.00028 (19)	−0.0002 (2)	0.00003 (17)
Ge2	0.0096 (3)	0.0070 (3)	0.0062 (3)	0.00035 (18)	−0.0004 (2)	−0.0002 (2)
Cu1	0.0074 (4)	0.0073 (4)	0.0031 (4)	0.0001 (2)	−0.0005 (2)	−0.0002 (2)
Na1	0.0245 (19)	0.0161 (18)	0.0170 (18)	0.0027 (13)	−0.0063 (16)	−0.0008 (11)
Na2	0.0247 (18)	0.0139 (17)	0.0163 (17)	0.000	0.0081 (16)	0.000
Na3	0.0181 (11)	0.0138 (12)	0.0160 (11)	−0.0008 (8)	−0.0016 (9)	0.0011 (9)
O1	0.012 (2)	0.0102 (18)	0.0114 (19)	0.0010 (13)	0.0034 (16)	0.0044 (14)
O2	0.015 (2)	0.013 (2)	0.0116 (18)	−0.0015 (15)	0.0031 (18)	0.0007 (15)
O3	0.0143 (19)	0.013 (2)	0.013 (2)	0.0034 (15)	0.001 (2)	−0.0005 (13)
O4	0.0148 (19)	0.013 (2)	0.0050 (15)	−0.0053 (16)	−0.0005 (15)	−0.0022 (14)
O5	0.017 (2)	0.012 (2)	0.0123 (19)	0.0009 (15)	0.000 (2)	0.0003 (16)
O6	0.007 (2)	0.011 (3)	0.014 (2)	0.000	−0.002 (2)	0.000
O7	0.012 (2)	0.0115 (19)	0.0130 (19)	−0.0026 (14)	−0.0013 (16)	−0.0037 (15)
O8	0.0126 (18)	0.0107 (18)	0.0081 (15)	0.0021 (14)	0.0001 (15)	0.0047 (16)
O1W	0.023 (3)	0.012 (3)	0.016 (3)	0.000	0.006 (3)	0.000

Ge1—O1	1.721 (4)	Na2—O1Wvi	2.375 (8)
Ge1—O4	1.724 (4)	Na2—O2v	2.408 (4)
Ge1—O3	1.781 (4)	Na2—O2vii	2.408 (4)
Ge1—O2	1.795 (4)	Na2—O6	2.429 (6)
Ge2—O7i	1.724 (4)	Na2—O1ii	2.551 (4)
Ge2—O8	1.729 (3)	Na2—O1vi	2.551 (4)
Ge2—O6	1.772 (2)	Na3—O2viii	2.395 (5)
Ge2—O5	1.794 (4)	Na3—O4v	2.398 (4)
Cu1—O4	1.953 (4)	Na3—O8	2.410 (4)
Cu1—O1ii	1.960 (4)	Na3—O5ii	2.441 (5)
Cu1—O8	1.961 (4)	Na3—O1W	2.535 (2)
Cu1—O7	1.964 (4)	Na3—O3ix	2.543 (5)
Na1—O5iii	2.388 (4)	O2—H2	0.8200
Na1—O3iv	2.459 (4)	O3—H3	0.8200
Na1—O3v	2.459 (4)	O5—H5	0.8200
Na1—O7iv	2.568 (4)	O1W—H1	0.85 (4)
Na1—O7v	2.568 (4)
O1—Ge1—O4	118.13 (19)	O1Wvi—Na2—Na3ii	48.81 (5)
O1—Ge1—O3	108.67 (19)	O2v—Na2—Na3ii	45.42 (11)
O4—Ge1—O3	108.5 (2)	O2vii—Na2—Na3ii	142.64 (15)
O1—Ge1—O2	108.73 (19)	O6—Na2—Na3ii	131.19 (5)
O4—Ge1—O2	106.20 (17)	O1ii—Na2—Na3ii	90.23 (11)
O3—Ge1—O2	105.96 (18)	O1vi—Na2—Na3ii	89.31 (11)
O7i—Ge2—O8	119.18 (18)	Na3vi—Na2—Na3ii	97.61 (10)
O7i—Ge2—O6	108.55 (17)	O2viii—Na3—O4v	91.63 (15)
O8—Ge2—O6	107.15 (19)	O2viii—Na3—O8	98.11 (15)
O7i—Ge2—O5	107.56 (19)	O4v—Na3—O8	85.22 (14)
O8—Ge2—O5	106.51 (18)	O2viii—Na3—O5ii	169.22 (15)
O6—Ge2—O5	107.36 (15)	O4v—Na3—O5ii	95.79 (16)
O7i—Ge2—Na3	122.03 (14)	O8—Na3—O5ii	90.31 (14)
O6—Ge2—Na3	127.45 (13)	O2viii—Na3—O1W	90.37 (19)
O5—Ge2—Na3	71.65 (14)	O4v—Na3—O1W	175.92 (17)
O4—Cu1—O1ii	106.53 (14)	O8—Na3—O1W	98.03 (12)
O4—Cu1—O8	118.46 (17)	O5ii—Na3—O1W	81.77 (18)
O1ii—Cu1—O8	103.48 (14)	O2viii—Na3—O3ix	80.36 (15)
O4—Cu1—O7	101.33 (15)	O4v—Na3—O3ix	97.19 (14)
O1ii—Cu1—O7	120.99 (16)	O8—Na3—O3ix	177.16 (16)
O8—Cu1—O7	107.05 (14)	O5ii—Na3—O3ix	90.94 (15)
O4—Cu1—O7	101.33 (15)	O1W—Na3—O3ix	79.63 (12)
O1ii—Cu1—O7	120.99 (16)	O2viii—Na3—Na2xi	45.72 (11)
O8—Cu1—O7	107.05 (14)	O4v—Na3—Na2xi	137.34 (13)
O7—Cu1—O7	0.0 (2)	O8—Na3—Na2xi	98.36 (11)
O5iii—Na1—O3iv	85.71 (13)	O5ii—Na3—Na2xi	126.51 (13)
O5iii—Na1—O3v	94.29 (13)	O1W—Na3—Na2xi	44.81 (16)
O3iv—Na1—O3v	180.0	O3ix—Na3—Na2xi	78.85 (11)
O5iii—Na1—O7iv	95.68 (12)	O2viii—Na3—Na1xii	126.64 (12)
O3iv—Na1—O7iv	85.86 (13)	O4v—Na3—Na1xii	96.07 (12)
O3v—Na1—O7iv	94.14 (13)	O8—Na3—Na1xii	135.08 (12)
O5iii—Na1—O7v	84.32 (12)	O5ii—Na3—Na1xii	44.80 (10)
O3iv—Na1—O7v	94.14 (13)	O1W—Na3—Na1xii	79.88 (12)
O3v—Na1—O7v	85.86 (13)	O3ix—Na3—Na1xii	46.31 (10)
O7iv—Na1—O7v	180.0	Na2xi—Na3—Na1xii	109.67 (7)
O5iii—Na1—Na3i	133.93 (11)	O2viii—Na3—Ge2	77.56 (11)
O3iv—Na1—Na3i	48.40 (10)	O4v—Na3—Ge2	71.75 (11)
O3v—Na1—Na3i	131.60 (10)	O8—Na3—Ge2	25.09 (8)
O7iv—Na1—Na3i	86.13 (9)	O5ii—Na3—Ge2	112.20 (12)
O7v—Na1—Na3i	93.87 (9)	O1W—Na3—Ge2	112.18 (8)
O5iii—Na1—Na3x	46.07 (11)	O3ix—Na3—Ge2	154.87 (13)
O3iv—Na1—Na3x	131.60 (10)	Na2xi—Na3—Ge2	93.97 (6)
O3v—Na1—Na3x	48.40 (10)	Na1xii—Na3—Ge2	154.09 (7)
O7iv—Na1—Na3x	93.87 (9)	Ge1—O1—Cu1i	120.2 (2)
O7v—Na1—Na3x	86.13 (9)	Ge1—O1—Na2xi	124.3 (2)
Na3i—Na1—Na3x	180.0	Cu1i—O1—Na2xi	111.90 (16)
O1Wvi—Na2—O2v	94.04 (13)	Ge1—O2—H2	109.5
O1Wvi—Na2—O2vii	94.04 (13)	Ge1—O3—H3	109.5
O2v—Na2—O2vii	171.9 (3)	Ge1—O4—Cu1	120.93 (19)
O1Wvi—Na2—O6	180.000 (1)	Ge1—O4—Na3xiii	120.2 (2)
O2v—Na2—O6	85.96 (12)	Cu1—O4—Na3xiii	114.70 (16)
O2vii—Na2—O6	85.96 (12)	Ge2—O5—H5	109.5
O1Wvi—Na2—O1ii	89.65 (11)	Ge2—O6—Ge2xiv	124.9 (3)
O2v—Na2—O1ii	95.04 (12)	Ge2—O6—Na2	117.56 (15)
O2vii—Na2—O1ii	85.01 (12)	Ge2xiv—O6—Na2	117.56 (15)
O6—Na2—O1ii	90.35 (12)	Ge2ii—O7—Cu1	117.7 (2)
O1Wvi—Na2—O1vi	89.65 (12)	Ge2ii—O7—Na1xiii	121.2 (2)
O2v—Na2—O1vi	85.01 (12)	Cu1—O7—Na1xiii	114.33 (16)
O2vii—Na2—O1vi	95.04 (12)	Ge2—O8—Cu1	122.7 (2)
O6—Na2—O1vi	90.35 (12)	Ge2—O8—Na3	118.67 (19)
O1ii—Na2—O1vi	179.3 (2)	Cu1—O8—Na3	113.70 (15)
O1Wvi—Na2—Na3vi	48.81 (5)	Na2xi—O1W—Na3ix	86.38 (15)
O2v—Na2—Na3vi	142.64 (15)	Na2xi—O1W—Na3	86.38 (15)
O2vii—Na2—Na3vi	45.42 (11)	Na3ix—O1W—Na3	172.8 (3)
O6—Na2—Na3vi	131.19 (5)	Na2xi—O1W—H1	138 (4)
O1ii—Na2—Na3vi	89.31 (11)	Na3ix—O1W—H1	87 (5)
O1vi—Na2—Na3vi	90.23 (11)	Na3—O1W—H1	98 (5)
O7i—Ge2—Na3—O2viii	47.40 (19)	O8—Ge2—O6—Na2	0.66 (13)
O8—Ge2—Na3—O2viii	144.2 (2)	O5—Ge2—O6—Na2	−113.42 (14)
O6—Ge2—Na3—O2viii	−150.40 (15)	Na3—Ge2—O6—Na2	−33.55 (8)
O5—Ge2—Na3—O2viii	−52.23 (17)	O2v—Na2—O6—Ge2	43.59 (9)
O7i—Ge2—Na3—O4v	143.33 (18)	O2vii—Na2—O6—Ge2	−136.41 (9)
O8—Ge2—Na3—O4v	−119.8 (2)	O1ii—Na2—O6—Ge2	−51.44 (9)
O6—Ge2—Na3—O4v	−54.47 (16)	O1vi—Na2—O6—Ge2	128.56 (9)
O5—Ge2—Na3—O4v	43.70 (17)	Na3vi—Na2—O6—Ge2	−140.83 (6)
O7i—Ge2—Na3—O8	−96.8 (3)	Na3ii—Na2—O6—Ge2	39.17 (6)
O6—Ge2—Na3—O8	65.4 (2)	O2v—Na2—O6—Ge2xiv	−136.41 (9)
O5—Ge2—Na3—O8	163.5 (3)	O2vii—Na2—O6—Ge2xiv	43.59 (9)
O7i—Ge2—Na3—O5ii	−127.81 (18)	O1ii—Na2—O6—Ge2xiv	128.56 (9)
O8—Ge2—Na3—O5ii	−31.0 (2)	O1vi—Na2—O6—Ge2xiv	−51.44 (9)
O6—Ge2—Na3—O5ii	34.39 (18)	Na3vi—Na2—O6—Ge2xiv	39.17 (6)
O5—Ge2—Na3—O5ii	132.6 (2)	Na3ii—Na2—O6—Ge2xiv	−140.83 (6)
O7i—Ge2—Na3—O1W	−37.9 (2)	O4—Cu1—O7—O7	0.00 (9)
O8—Ge2—Na3—O1W	59.0 (3)	O1ii—Cu1—O7—O7	0.00 (16)
O6—Ge2—Na3—O1W	124.35 (18)	O8—Cu1—O7—O7	0.00 (11)
O5—Ge2—Na3—O1W	−137.5 (2)	O4—Cu1—O7—Ge2ii	−170.6 (2)
O7i—Ge2—Na3—O3ix	76.5 (3)	O1ii—Cu1—O7—Ge2ii	−53.3 (3)
O8—Ge2—Na3—O3ix	173.3 (4)	O8—Cu1—O7—Ge2ii	64.6 (2)
O6—Ge2—Na3—O3ix	−121.3 (3)	O7—Cu1—O7—Ge2ii	0(49)
O5—Ge2—Na3—O3ix	−23.2 (3)	O4—Cu1—O7—Na1xiii	−18.9 (2)
O7i—Ge2—Na3—Na2xi	4.45 (16)	O1ii—Cu1—O7—Na1xiii	98.39 (19)
O8—Ge2—Na3—Na2xi	101.3 (2)	O8—Cu1—O7—Na1xiii	−143.67 (16)
O6—Ge2—Na3—Na2xi	166.65 (12)	O7—Cu1—O7—Na1xiii	0(22)
O5—Ge2—Na3—Na2xi	−95.19 (15)	O7i—Ge2—O8—Cu1	−48.1 (3)
O7i—Ge2—Na3—Na1xii	−151.8 (2)	O6—Ge2—O8—Cu1	75.6 (2)
O8—Ge2—Na3—Na1xii	−54.9 (2)	O5—Ge2—O8—Cu1	−169.8 (2)
O6—Ge2—Na3—Na1xii	10.4 (2)	Na3—Ge2—O8—Cu1	−153.5 (4)
O5—Ge2—Na3—Na1xii	108.6 (2)	O7i—Ge2—O8—Na3	105.4 (2)
O4—Ge1—O1—Cu1i	−51.6 (3)	O6—Ge2—O8—Na3	−130.96 (16)
O3—Ge1—O1—Cu1i	−175.7 (2)	O5—Ge2—O8—Na3	−16.3 (3)
O2—Ge1—O1—Cu1i	69.4 (3)	O4—Cu1—O8—Ge2	52.6 (3)
O4—Ge1—O1—Na2xi	105.0 (3)	O1ii—Cu1—O8—Ge2	−65.0 (3)
O3—Ge1—O1—Na2xi	−19.1 (3)	O7—Cu1—O8—Ge2	166.1 (2)
O2—Ge1—O1—Na2xi	−134.0 (2)	O7—Cu1—O8—Ge2	166.1 (2)
O1—Ge1—O4—Cu1	−47.6 (3)	O4—Cu1—O8—Na3	−102.1 (2)
O3—Ge1—O4—Cu1	76.6 (3)	O1ii—Cu1—O8—Na3	140.33 (17)
O2—Ge1—O4—Cu1	−169.9 (2)	O7—Cu1—O8—Na3	11.5 (2)
O1—Ge1—O4—Na3xiii	108.2 (2)	O7—Cu1—O8—Na3	11.5 (2)
O3—Ge1—O4—Na3xiii	−127.6 (2)	O2viii—Na3—O8—Ge2	−35.2 (2)
O2—Ge1—O4—Na3xiii	−14.1 (3)	O4v—Na3—O8—Ge2	55.8 (2)
O1ii—Cu1—O4—Ge1	170.2 (2)	O5ii—Na3—O8—Ge2	151.5 (2)
O8—Cu1—O4—Ge1	54.2 (3)	O1W—Na3—O8—Ge2	−126.7 (2)
O7—Cu1—O4—Ge1	−62.5 (3)	Na2xi—Na3—O8—Ge2	−81.4 (2)
O7—Cu1—O4—Ge1	−62.5 (3)	Na1xii—Na3—O8—Ge2	149.58 (14)
O1ii—Cu1—O4—Na3xiii	13.1 (2)	O2viii—Na3—O8—Cu1	120.56 (19)
O8—Cu1—O4—Na3xiii	−102.9 (2)	O4v—Na3—O8—Cu1	−148.5 (2)
O7—Cu1—O4—Na3xiii	140.47 (18)	O5ii—Na3—O8—Cu1	−52.70 (19)
O7—Cu1—O4—Na3xiii	140.47 (18)	O1W—Na3—O8—Cu1	29.0 (2)
O7i—Ge2—O6—Ge2xiv	−49.42 (14)	Na2xi—Na3—O8—Cu1	74.33 (17)
O8—Ge2—O6—Ge2xiv	−179.34 (13)	Na1xii—Na3—O8—Cu1	−54.7 (3)
O5—Ge2—O6—Ge2xiv	66.58 (14)	Ge2—Na3—O8—Cu1	155.8 (3)
Na3—Ge2—O6—Ge2xiv	146.45 (8)	O2viii—Na3—O1W—Na2xi	−4.43 (10)
O7i—Ge2—O6—Na2	130.58 (14)

D—H···A	D—H	H···A	D···A	D—H···A
O2—H2···O6xiii	0.82	2.59	3.298 (5)	146
O3—H3···O1xv	0.82	1.98	2.765 (6)	161
O5—H5···O4v	0.82	1.94	2.755 (6)	171
O1W—H1···O7	0.85 (4)	1.96 (5)	2.773 (6)	159 (6)

Table 1

Selected bond lengths (Å)

Ge1—O1	1.721 (4)
Ge1—O4	1.724 (4)
Ge1—O3	1.781 (4)
Ge1—O2	1.795 (4)
Ge2—O7i	1.724 (4)
Ge2—O8	1.729 (3)
Ge2—O6	1.772 (2)
Ge2—O5	1.794 (4)
Cu1—O4	1.953 (4)
Cu1—O1ii	1.960 (4)
Cu1—O8	1.961 (4)
Cu1—O7	1.964 (4)

Symmetry codes: (i) ; (ii) .

Table 2

Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O2—H2⋯O6iii	0.82	2.59	3.298 (5)	146
O3—H3⋯O1iv	0.82	1.98	2.765 (6)	161
O5—H5⋯O4v	0.82	1.94	2.755 (6)	171
O1W—H1⋯O7	0.85 (4)	1.96 (5)	2.773 (6)	159 (6)

Symmetry codes: (iii) ; (iv) ; (v) .