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During the investigation of the Ga3+-HCl-cucurbituril system, we prepared crystals of the title compound, tetrakis(hydroxonium) bis­(tetra­chloro­gallate) dichloride cucurbituril decahydrate, by slow evaporation of an aqueous hydro­chloric solution containing Ga3+ and cucurbituril at room temperature in air. The compound appeared to be isostructural with the cucurbituril tetra­chloro­ferrate(III) adduct. The structure contains H7O3+ cations, [GaCl4]- anions, cucurbituril and water mol­ecules. The centres of the cucurbituril mol­ecules are arranged as body-centered packing and [GaCl4]- anions are situated in space between them. There is a complicated network of hydrogen bonds in the structure.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536800019498/na6021sup1.cif
Contains datablocks 1, global

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S1600536800019498/na6021Isup2.hkl
Contains datablock I

CCDC reference: 155844

Key indicators

  • Single-crystal X-ray study
  • T = 293 K
  • Mean [sigma](C-C) = 0.005 Å
  • H-atom completeness 98%
  • Disorder in solvent or counterion
  • R factor = 0.051
  • wR factor = 0.183
  • Data-to-parameter ratio = 14.4

checkCIF results

No syntax errors found

ADDSYM reports no extra symmetry


Yellow Alert Alert Level C:
PLAT_302 Alert C Anion/Solvent disorder ....................... 25.00 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:C36 H68 Cl10 Ga2 N24 O26 Atom count from the _atom_site data: C36 H66 Cl10 Ga2 N24 O26 CELLZ_01 From the CIF: _cell_formula_units_Z 4 From the CIF: _chemical_formula_sum C36 H68 Cl10 Ga2 N24 O26 TEST: Compare cell contents of formula and atom_site data atom Z*formula cif sites diff C 144.00 144.00 0.00 H 272.00 264.00 8.00 Cl 40.00 40.00 0.00 Ga 8.00 8.00 0.00 N 96.00 96.00 0.00 O 104.00 104.00 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

Recently, during the investigation of the Fe3+–HCl–cucurbituril system, we obtained a supramolecular adduct containing the tetrachloroferrate(III) anion and cucurbituril (Virovets et al., 2001). Using Ga3+ salts, under the same conditions, we have crystallized the isostructural title compound, (I).

The structure of the title compound contains hydroxonium cations, [GaCl4]- anions, chloride anions, cucurbituril and water molecules. Cucurbituril centres are arranged as body-centered packing and [GaCl4]- anions are situated in space between them. One water molecule is situated near to the centre inside the cucurbituril molecule and is disordered over four positions (O1C and O2C).

The [GaCl4]- anion lies on the mirror plane and is disordered over two orientations around the Ga1—Cl1 axis. The central Ga atoms have tetrahedral environments and the Ga—Cl distances correspond to those known from other reports (Buscher et al., 1984; Gearhart et al., 1975).

There are two crystallographically independent hydroxonium cations in the structure (O1W and O3W). They lie on the mirror planes, and each cation is joined with two water molecules by short hydrogen bonds (see Table 2). The O···O···O angles are 109.6 (2) and 110.9 (1)°. This corresponds to formation of H7O3+ cations in the crystal (Wells, 1986).

There is a complicated hydrogen-bound network joining O atoms of the cucurbituril carbonyl groups, water molecules, complex anions and chloride in the structure.

Experimental top

The title compound was prepared by crystallization from an aqueous hydrochloric solution containing Ga3+ and cucurbituril. A mixture of Ga(NO3)3·8H2O (0.07 g, 0.18 mmol) and cucurbituril (0.03 g, 0.03 mmol) was dissolved in 2 M HCl (5 ml) and was heated for 5 min. The mixture was filtered and was kept open for 1–2 weeks in a vial until some crystals appeared. Then the vial was closed and the large colourless parallelepipedal crystals were isolated by filtration after 2 weeks. Yield 96% (0.05 g).

Refinement top

The H atoms of the disordered water molecule were not considered.

Computing details top

Data collection: XSCANS (Bruker, 1998); cell refinement: XSCANS; data reduction: SHELXTL-Plus (Sheldrick, 1990); program(s) used to solve structure: SHELXTL-Plus; program(s) used to refine structure: SHELXL97 (Sheldrick, 1998); molecular graphics: local program; software used to prepare material for publication: local program.

Tetrakis(hydroxonium) bis(tetrachlorogallate) dichloride cucurbituril decahydrate top
Crystal data top
(H7O3)4[GaCl4]2Cl2·C36H36N24O12·2H2ODx = 1.668 Mg m3
Mr = 1747.08Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, CmcaCell parameters from 24 reflections
a = 16.5665 (10) Åθ = 16–22°
b = 16.7800 (9) ŵ = 1.25 mm1
c = 25.0342 (10) ÅT = 293 K
V = 6959.2 (6) Å3Parallelepiped, colourless
Z = 40.60 × 0.35 × 0.20 mm
F(000) = 3568
Data collection top
Bruker P4
diffractometer
3008 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.000
Graphite monochromatorθmax = 27.5°, θmin = 1.9°
ω scansh = 210
Absorption correction: ψ scan
(Sheldrick, 1990)
k = 021
Tmin = 0.531, Tmax = 0.778l = 320
4092 measured reflections3 standard reflections every 97 reflections
4092 independent reflections intensity decay: none
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.051Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.183H atoms treated by a mixture of independent and constrained refinement
S = 1.04 w = 1/[σ2(Fo2) + (0.1074P)2 + 10.4226P]
where P = (Fo2 + 2Fc2)/3
4092 reflections(Δ/σ)max = 0.001
285 parametersΔρmax = 0.84 e Å3
15 restraintsΔρmin = 0.53 e Å3
Crystal data top
(H7O3)4[GaCl4]2Cl2·C36H36N24O12·2H2OV = 6959.2 (6) Å3
Mr = 1747.08Z = 4
Orthorhombic, CmcaMo Kα radiation
a = 16.5665 (10) ŵ = 1.25 mm1
b = 16.7800 (9) ÅT = 293 K
c = 25.0342 (10) Å0.60 × 0.35 × 0.20 mm
Data collection top
Bruker P4
diffractometer
3008 reflections with I > 2σ(I)
Absorption correction: ψ scan
(Sheldrick, 1990)
Rint = 0.000
Tmin = 0.531, Tmax = 0.7783 standard reflections every 97 reflections
4092 measured reflections intensity decay: none
4092 independent reflections
Refinement top
R[F2 > 2σ(F2)] = 0.05115 restraints
wR(F2) = 0.183H atoms treated by a mixture of independent and constrained refinement
S = 1.04 w = 1/[σ2(Fo2) + (0.1074P)2 + 10.4226P]
where P = (Fo2 + 2Fc2)/3
4092 reflectionsΔρmax = 0.84 e Å3
285 parametersΔρmin = 0.53 e Å3
Special details top

Experimental. none

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
xyzUiso*/UeqOcc. (<1)
Ga10.50000.02140 (4)0.65300 (2)0.0475 (2)
Cl10.50000.02171 (10)0.56692 (5)0.0526 (4)
Cl210.3949 (7)0.0709 (8)0.6854 (5)0.082 (3)0.50
Cl220.3927 (8)0.0917 (8)0.6798 (5)0.076 (2)0.50
Cl310.5184 (8)0.09959 (17)0.67997 (11)0.111 (4)0.50
Cl40.25000.30977 (10)0.25000.0600 (4)
C1110.04674 (18)0.13451 (18)0.31787 (12)0.0311 (6)
H1110.06850.15740.28490.031*
C110.00000.0033 (3)0.32326 (19)0.0365 (10)
O110.00000.0692 (2)0.32348 (18)0.0513 (10)
C120.00000.2112 (3)0.38920 (18)0.0325 (9)
O120.00000.2573 (2)0.42714 (14)0.0460 (9)
N110.06654 (17)0.05100 (16)0.32279 (11)0.0350 (6)
N120.06673 (16)0.18287 (16)0.36401 (11)0.0338 (6)
C11B0.1472 (2)0.0199 (2)0.31581 (13)0.0371 (7)
H11A0.17540.05280.28990.037*
H11B0.14360.03350.30120.037*
C12B0.14743 (19)0.20595 (18)0.37867 (13)0.0335 (7)
H12A0.17770.21760.34640.034*
H12B0.14480.25450.39960.034*
C2110.23914 (19)0.08410 (19)0.38539 (13)0.0330 (7)
H2110.27700.10540.35890.033*
C2120.2839 (2)0.0484 (2)0.43422 (13)0.0338 (7)
H2120.34250.05450.43100.034*
C210.2086 (2)0.0508 (2)0.39219 (13)0.0378 (7)
O210.18160 (18)0.11745 (15)0.38188 (11)0.0494 (7)
C220.20043 (19)0.15193 (19)0.46292 (13)0.0330 (7)
O220.16922 (16)0.20167 (15)0.49166 (10)0.0446 (6)
N210.19446 (18)0.01711 (16)0.36461 (12)0.0369 (6)
N220.26006 (18)0.03444 (17)0.43309 (11)0.0374 (6)
N230.25235 (17)0.09319 (16)0.47875 (11)0.0351 (6)
N240.19022 (17)0.14648 (16)0.40885 (11)0.0348 (6)
C21B0.2905 (2)0.09390 (19)0.46902 (14)0.0377 (7)
H21A0.34810.08580.47350.038*
H21B0.28280.14600.45300.038*
O1W0.00000.2116 (3)0.2591 (2)0.0662 (12)
H1W10.00000.162 (3)0.238 (2)0.066*
H2W10.043 (2)0.213 (3)0.2857 (15)0.066*
O2W0.1231 (2)0.2227 (2)0.31466 (17)0.0845 (12)
H1W20.146 (3)0.175 (2)0.331 (2)0.084*
H2W20.170 (3)0.249 (3)0.295 (2)0.084*
O3W0.00000.3147 (3)0.5226 (2)0.095 (2)
H1W30.0474 (9)0.299 (3)0.5448 (15)0.095*
H2W30.00000.282 (4)0.4929 (19)0.095*
O4W0.1229 (3)0.2866 (2)0.57685 (17)0.0840 (12)
H1W40.105 (3)0.264 (3)0.6122 (13)0.084*
H2W40.135 (3)0.239 (2)0.5544 (17)0.084*
O5W0.00000.1356 (9)0.4285 (7)0.116 (5)0.50
H1W50.0481 (9)0.157 (7)0.410 (4)0.116*0.50
O1C0.00000.041 (3)0.488 (2)0.18 (2)0.25
O2C0.050 (2)0.00000.50000.163 (18)0.25
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Ga10.0541 (4)0.0537 (4)0.0348 (3)0.0000.0000.0026 (2)
Cl10.0438 (7)0.0791 (10)0.0349 (6)0.0000.0000.0050 (6)
Cl210.055 (2)0.137 (9)0.055 (2)0.015 (4)0.020 (2)0.012 (4)
Cl220.062 (2)0.093 (4)0.072 (4)0.018 (2)0.002 (2)0.016 (3)
Cl310.192 (13)0.0674 (13)0.0730 (14)0.022 (3)0.001 (3)0.0285 (11)
Cl40.0621 (9)0.0668 (9)0.0512 (7)0.0000.0169 (7)0.000
C1110.0331 (16)0.0306 (15)0.0295 (14)0.0006 (12)0.0008 (12)0.0021 (12)
C110.044 (3)0.034 (2)0.031 (2)0.0000.0000.0033 (18)
O110.056 (2)0.0315 (18)0.067 (3)0.0000.0000.0068 (17)
C120.034 (2)0.031 (2)0.031 (2)0.0000.0000.0010 (18)
O120.0473 (19)0.049 (2)0.0413 (19)0.0000.0000.0190 (16)
N110.0364 (14)0.0286 (13)0.0401 (14)0.0039 (11)0.0002 (12)0.0032 (11)
N120.0320 (13)0.0340 (13)0.0355 (13)0.0005 (11)0.0013 (11)0.0058 (11)
C11B0.0417 (17)0.0377 (17)0.0320 (15)0.0062 (14)0.0021 (14)0.0063 (13)
C12B0.0341 (15)0.0273 (14)0.0391 (16)0.0023 (13)0.0017 (13)0.0010 (12)
C2110.0283 (15)0.0360 (16)0.0346 (15)0.0007 (12)0.0053 (12)0.0016 (13)
C2120.0279 (14)0.0358 (16)0.0378 (16)0.0006 (13)0.0049 (13)0.0001 (13)
C210.0372 (17)0.0397 (17)0.0364 (16)0.0045 (14)0.0063 (13)0.0035 (14)
O210.0646 (18)0.0346 (13)0.0491 (14)0.0057 (12)0.0062 (13)0.0042 (11)
C220.0278 (14)0.0357 (16)0.0357 (15)0.0045 (12)0.0003 (12)0.0014 (13)
O220.0479 (14)0.0453 (13)0.0405 (13)0.0083 (11)0.0023 (11)0.0107 (11)
N210.0403 (15)0.0328 (14)0.0377 (14)0.0023 (12)0.0027 (12)0.0007 (11)
N220.0416 (15)0.0335 (13)0.0371 (14)0.0016 (12)0.0013 (12)0.0003 (11)
N230.0343 (13)0.0377 (14)0.0334 (13)0.0005 (12)0.0025 (11)0.0023 (11)
N240.0344 (14)0.0343 (13)0.0357 (14)0.0052 (11)0.0001 (11)0.0028 (11)
C21B0.0369 (17)0.0350 (16)0.0411 (17)0.0083 (14)0.0075 (14)0.0004 (14)
O1W0.084 (3)0.043 (2)0.072 (3)0.0000.0000.003 (2)
O2W0.081 (3)0.077 (2)0.095 (3)0.004 (2)0.006 (2)0.039 (2)
O3W0.171 (7)0.069 (3)0.045 (3)0.0000.0000.005 (2)
O4W0.090 (3)0.076 (2)0.086 (3)0.024 (2)0.031 (2)0.028 (2)
O5W0.096 (9)0.095 (9)0.156 (14)0.0000.0000.065 (10)
O1C0.14 (4)0.17 (4)0.24 (6)0.0000.0000.07 (4)
O2C0.06 (2)0.18 (4)0.24 (5)0.0000.0000.02 (4)
Geometric parameters (Å, º) top
Ga1—Cl12.1549 (14)C211—N241.448 (4)
Ga1—Cl21i2.093 (9)C212—H2120.9800
Ga1—Cl212.093 (9)C212—N221.445 (4)
Ga1—Cl22i2.236 (11)C212—N231.442 (4)
Ga1—Cl222.236 (11)C21—O211.232 (4)
Ga1—Cl31i2.161 (3)C21—N211.353 (5)
Ga1—Cl312.161 (3)C21—N221.360 (5)
Cl31—Cl31i0.61 (3)C22—O221.217 (4)
C111—C111ii1.549 (6)C22—N231.367 (4)
C111—H1110.9800C22—N241.367 (4)
C111—N111.444 (4)N22—C21B1.435 (4)
C111—N121.450 (4)N23—C21Biii1.452 (4)
C11—O111.217 (6)C21B—N23iii1.452 (4)
C11—N111.362 (4)C21B—H21A0.9700
C11—N11ii1.362 (4)C21B—H21B0.9700
C12—O121.226 (6)O1W—H1W10.99 (3)
C12—N12ii1.358 (4)O1W—H2W10.98 (2)
C12—N121.358 (4)O2W—H1W20.96 (3)
N11—C11B1.446 (4)O2W—H2W21.02 (3)
N12—C12B1.439 (4)O3W—H1W31.00 (2)
C11B—H11A0.9700O3W—H2W30.93 (3)
C11B—H11B0.9700O4W—H1W41.01 (3)
C11B—N211.451 (4)O4W—H2W41.00 (3)
C12B—H12A0.9700O5W—H1W50.99 (3)
C12B—H12B0.9700O1C—O1Civ1.48 (9)
C12B—N241.439 (4)O1C—O2C1.11 (3)
C211—H2110.9800O1C—O2Civ1.11 (3)
C211—C2121.550 (5)O2C—O1Civ1.11 (3)
C211—N211.443 (4)O2C—O2Civ1.66 (7)
Cl1—Ga1—Cl22107.4 (3)N24—C12B—N12113.9 (3)
Cl1—Ga1—Cl22i107.4 (3)N24—C12B—H12A108.8
Cl1—Ga1—Cl31108.34 (10)N24—C12B—H12B108.8
Cl1—Ga1—Cl31i108.34 (10)C212—C211—H211111.6
Cl21—Ga1—Cl1112.8 (4)N21—C211—H211111.6
Cl21i—Ga1—Cl1112.8 (4)N21—C211—C212103.2 (3)
Cl21i—Ga1—Cl21112.5 (8)N21—C211—N24115.0 (3)
Cl21i—Ga1—Cl22i9.3 (7)N24—C211—H211111.6
Cl21—Ga1—Cl22i109.60 (12)N24—C211—C212103.1 (3)
Cl21i—Ga1—Cl22109.60 (12)C211—C212—H212111.6
Cl21—Ga1—Cl229.3 (7)N22—C212—C211103.0 (3)
Cl21i—Ga1—Cl31i111.7 (5)N22—C212—H212111.6
Cl21—Ga1—Cl31i97.7 (5)N23—C212—C211103.6 (3)
Cl21i—Ga1—Cl3197.7 (5)N23—C212—H212111.6
Cl21—Ga1—Cl31111.7 (5)N23—C212—N22114.7 (3)
Cl22i—Ga1—Cl22105.3 (7)O21—C21—N21126.5 (3)
Cl31i—Ga1—Cl22i120.9 (5)O21—C21—N22124.6 (3)
Cl31—Ga1—Cl22i106.9 (5)N21—C21—N22108.8 (3)
Cl31i—Ga1—Cl22106.9 (5)O22—C22—N23126.2 (3)
Cl31—Ga1—Cl22120.9 (5)O22—C22—N24125.3 (3)
Cl31i—Ga1—Cl3116.2 (7)N23—C22—N24108.5 (3)
Cl31i—Cl31—Ga181.9 (4)C211—N21—C11B123.7 (3)
C111ii—C111—H111111.6C21—N21—C11B123.4 (3)
N11—C111—C111ii103.12 (17)C21—N21—C211112.5 (3)
N11—C111—H111111.6C21—N22—C212112.3 (3)
N11—C111—N12115.0 (3)C21—N22—C21B123.5 (3)
N12—C111—C111ii103.21 (16)C21B—N22—C212124.1 (3)
N12—C111—H111111.6C212—N23—C21Biii122.8 (3)
O11—C11—N11126.0 (2)C22—N23—C212112.3 (3)
O11—C11—N11ii126.0 (2)C22—N23—C21Biii121.9 (3)
N11—C11—N11ii108.1 (4)C12B—N24—C211124.3 (3)
O12—C12—N12ii125.49 (19)C22—N24—C12B122.3 (3)
O12—C12—N12125.49 (19)C22—N24—C211112.4 (3)
N12ii—C12—N12109.0 (4)N22—C21B—N23iii113.9 (3)
C111—N11—C11B123.3 (3)N22—C21B—H21A108.8
C11—N11—C111112.8 (3)N22—C21B—H21B108.8
C11—N11—C11B122.5 (3)N23iii—C21B—H21A108.8
C12—N12—C111112.3 (3)N23iii—C21B—H21B108.8
C12—N12—C12B122.9 (3)H21A—C21B—H21B107.7
C12B—N12—C111124.5 (3)H1W1—O1W—H2W1112 (3)
N11—C11B—H11A108.7H1W2—O2W—H2W2105 (3)
N11—C11B—H11B108.7H1W3—O3W—H2W3107 (3)
N11—C11B—N21114.1 (3)H1W4—O4W—H2W4104 (3)
H11A—C11B—H11B107.6O2C—O1C—O1Civ48 (2)
N21—C11B—H11A108.7O2Civ—O1C—O1Civ48 (2)
N21—C11B—H11B108.7O2C—O1C—O2Civ97 (5)
N12—C12B—H12A108.8O1C—O2C—O1Civ83 (5)
N12—C12B—H12B108.8O1C—O2C—O2Civ42 (2)
H12A—C12B—H12B107.7O1Civ—O2C—O2Civ42 (2)
Symmetry codes: (i) x+1, y, z; (ii) x, y, z; (iii) x, y, z+1; (iv) x, y, z+1.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O1W—H2W1···O2W0.98 (2)1.52 (4)2.476 (5)165 (3)
O3W—H1W3···O4W1.00 (2)1.50 (3)2.492 (6)172 (4)

Experimental details

Crystal data
Chemical formula(H7O3)4[GaCl4]2Cl2·C36H36N24O12·2H2O
Mr1747.08
Crystal system, space groupOrthorhombic, Cmca
Temperature (K)293
a, b, c (Å)16.5665 (10), 16.7800 (9), 25.0342 (10)
V3)6959.2 (6)
Z4
Radiation typeMo Kα
µ (mm1)1.25
Crystal size (mm)0.60 × 0.35 × 0.20
Data collection
DiffractometerBruker P4
diffractometer
Absorption correctionψ scan
(Sheldrick, 1990)
Tmin, Tmax0.531, 0.778
No. of measured, independent and
observed [I > 2σ(I)] reflections
4092, 4092, 3008
Rint0.000
(sin θ/λ)max1)0.649
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.051, 0.183, 1.04
No. of reflections4092
No. of parameters285
No. of restraints15
H-atom treatmentH atoms treated by a mixture of independent and constrained refinement
w = 1/[σ2(Fo2) + (0.1074P)2 + 10.4226P]
where P = (Fo2 + 2Fc2)/3
Δρmax, Δρmin (e Å3)0.84, 0.53

Computer programs: XSCANS (Bruker, 1998), XSCANS, SHELXTL-Plus (Sheldrick, 1990), SHELXTL-Plus, SHELXL97 (Sheldrick, 1998), local program.

Selected geometric parameters (Å, º) top
Ga1—Cl12.1549 (14)Ga1—Cl222.236 (11)
Ga1—Cl212.093 (9)Ga1—Cl312.161 (3)
Cl1—Ga1—Cl22107.4 (3)Cl21—Ga1—Cl31111.7 (5)
Cl1—Ga1—Cl31108.34 (10)Cl31—Ga1—Cl22i106.9 (5)
Cl21—Ga1—Cl1112.8 (4)Cl31—Ga1—Cl22120.9 (5)
Cl21i—Ga1—Cl22109.60 (12)Cl31i—Cl31—Ga181.9 (4)
Cl21—Ga1—Cl31i97.7 (5)
Symmetry code: (i) x+1, y, z.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O1W—H2W1···O2W0.98 (2)1.52 (4)2.476 (5)165 (3)
O3W—H1W3···O4W1.00 (2)1.50 (3)2.492 (6)172 (4)
 

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