Bis[μ-4-(4-carb­oxy­phen­oxy)phthalato]bis­[triaqua­cobalt(II)]

Wang, L.

doi:10.1107/S1600536813000536

metal-organic compounds

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ISSN: 2056-9890

Volume 69| Part 2| February 2013| Page m101

doi:10.1107/S1600536813000536

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Bis[μ-4-(4-carboxyphenoxy)phthalato]bis[triaquacobalt(II)]

Liang Wang ^a ^*

^aDepartment of Chemistry, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
^*Correspondence e-mail: chg_2010@qq.com

(Received 14 November 2012; accepted 7 January 2013; online 12 January 2013)

The dinuclear title complex, [Co₂(C₁₅H₈O₇)₂(H₂O)₆], lies across an inversion center. The unique Co^II ion is coordinated in a slightly distorted octahedral coordination geometry by two O atoms from a chelating 4-(carboxyphenoxy)phthalate ligand, three water O atoms and a further O atom from a bridging carboxylate group of a symmetry-related 4-(carboxyphenoxy)phthalate ligand. In the crystal, O—H⋯O hydrogen bonds link the molecules into a three-dimensional network.

Related literature

For background to metal-organic coordination complexes, see: Wang et al. (2009 ); Leininger et al. (2000 ). For Co—O bond lengths in related structures, see: Chu et al. (2011 ). For the isotypic Ni^II complex and the synthesis, see: Cai (2011 ).

Experimental

Crystal data

[Co₂(C₁₅H₈O₇)₂(H₂O)₆]
M_r = 826.38
Monoclinic, P 2₁ /c
a = 14.451 (11) Å
b = 9.558 (7) Å
c = 11.404 (9) Å
β = 92.749 (15)°
V = 1573 (2) Å³
Z = 2
Mo Kα radiation
μ = 1.15 mm⁻¹
T = 293 K
0.15 × 0.12 × 0.10 mm

Data collection

Bruker APEXII diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 2003 ) T_min = 0.847, T_max = 0.894
8135 measured reflections
3087 independent reflections
1591 reflections with I > 2σ(I)
R_int = 0.115

Refinement

R[F² > 2σ(F²)] = 0.059
wR(F²) = 0.116
S = 0.90
3087 reflections
235 parameters
9 restraints
H-atom parameters constrained
Δρ_max = 0.41 e Å⁻³
Δρ_min = −0.61 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O8—H8B⋯O1ⁱ	0.85	2.06	2.839 (5)	152
O6—H6A⋯O2ⁱⁱ	0.85	1.77	2.598 (5)	165
O8—H8A⋯O7ⁱⁱⁱ	0.84	2.14	2.865 (6)	144
O9—H9A⋯O3^iv	0.85	2.06	2.861 (5)	157
O9—H9B⋯O7^v	0.85	1.93	2.754 (5)	163
O10—H10A⋯O2^vi	0.85	2.10	2.788 (5)	138
O10—H10B⋯O3^vii	0.85	1.96	2.746 (5)	155
Symmetry codes: (i) $[-x+3, y+{\script{1\over 2}}, -z+{\script{1\over 2}}]$ ; (ii) -x+4, -y, -z; (iii) x-1, y, z; (iv) $[-x+3, y-{\script{1\over 2}}, -z+{\script{1\over 2}}]$ ; (v) $[x-1, -y-{\script{1\over 2}}, z+{\script{1\over 2}}]$ ; (vi) $[x, -y-{\script{1\over 2}}, z+{\script{1\over 2}}]$ ; (vii) -x+3, -y, -z+1.

Data collection: APEX2 (Bruker, 2004 ); cell refinement: SAINT (Bruker, 2001 ); data reduction: SAINT; 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.

Supporting information

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536813000536/lh5557sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536813000536/lh5557Isup2.hkl

checkCIF report

Comment top

In the field of supramolecular chemistry and crystal engineering, the design and assembly of metal-organic coordination complexes with appealing structures and properties have stimulated interests of chemists in recent decades (Wang et al., 2009; Leininger et al. 2000)). Thus far, a large number of metal-organic coordination complexes have been fabricated. In this paper paper, the synthesis and crystal structure of the title compound, based on the multidentate 4-(4-carboxyphenoxy)phthalate ligand (H₃L) is presented.

The molecular structure of the title compound is shown in Fig. 1. The dinuclear complex lies across an inversion center. The unique Co^II ion is coordinated in a slightly distorted octahedral coordination geometry by two oxygen atoms from a chelating 4-(carboxyphenoxy)phthalate ligand, three oxygen atoms from aqua ligands and a further O atom from a bridging carboxylate group of a symmetry related 4-(carboxyphenoxy)phthalate ligand. The Co—O bond lengths are as expected based on a a reported structure (Chu et al., 2011). In the crystal, O—H···O hydrogen bonds link molecules into a three-dimensional network (Table 1 and Fig. 2). The crystal structure of the isostructural Ni(II) complex has been published (Cai, 2011).

Related literature top

For background to metal-organic coordination complexes, see: Wang et al. (2009); Leininger et al. (2000). For Co—O bond lengths in related structures, see: Chu et al. (2011). For the isotypic Ni^II complex and the synthesis, see: Cai (2011).

Experimental top

The title compound was synthesized referring to a reported literature (Cai, 2011). H₃L (0.030 g, 0.1 mmol), Co(OAc)₂.4H₂O (0.050 g, 0.2 mmol), and H₂O (15 ml) was sealed in 25 ml Teflon-lined stainless steel reactor and heated to 393K. Purple blocks suitable for X-ray diffraction analysis were separated by filtration with the yield of 27%.

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); 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 molecular structure with displacement ellipsoids drawn at the 30% probability level, hydrogen atoms are omited for clarity [Symmetry code (a): -x+3, -y, -z+1].
	Fig. 2. Part of the crystal structure with hydrogen bonds shown as dashed lines.

Bis[µ-4-(4-carboxyphenoxy)phthalato]bis[triaquacobalt(II)] top

Crystal data top

[Co₂(C₁₅H₈O₇)₂(H₂O)₆]	F(000) = 844
M_r = 826.38	D_x = 1.744 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 679 reflections
a = 14.451 (11) Å	θ = 2.8–26.7°
b = 9.558 (7) Å	µ = 1.15 mm⁻¹
c = 11.404 (9) Å	T = 293 K
β = 92.749 (15)°	Block, purple
V = 1573 (2) Å³	0.15 × 0.12 × 0.10 mm
Z = 2

Data collection top

Bruker APEXII diffractometer	3087 independent reflections
Radiation source: fine-focus sealed tube	1591 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.115
ϕ and ω scans	θ_max = 26.0°, θ_min = 2.6°
Absorption correction: multi-scan (SADABS; Sheldrick, 2003)	h = −12→17
T_min = 0.847, T_max = 0.894	k = −11→11
8135 measured reflections	l = −13→14

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)] = 0.059	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.116	H-atom parameters constrained
S = 0.90	w = 1/[σ²(F_o²) + (0.0393P)²] where P = (F_o² + 2F_c²)/3
3087 reflections	(Δ/σ)_max = 0.001
235 parameters	Δρ_max = 0.41 e Å⁻³
9 restraints	Δρ_min = −0.61 e Å⁻³

Crystal data top

[Co₂(C₁₅H₈O₇)₂(H₂O)₆]	V = 1573 (2) Å³
M_r = 826.38	Z = 2
Monoclinic, P2₁/c	Mo Kα radiation
a = 14.451 (11) Å	µ = 1.15 mm⁻¹
b = 9.558 (7) Å	T = 293 K
c = 11.404 (9) Å	0.15 × 0.12 × 0.10 mm
β = 92.749 (15)°

Data collection top

Bruker APEXII diffractometer	3087 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 2003)	1591 reflections with I > 2σ(I)
T_min = 0.847, T_max = 0.894	R_int = 0.115
8135 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.059	9 restraints
wR(F²) = 0.116	H-atom parameters constrained
S = 0.90	Δρ_max = 0.41 e Å⁻³
3087 reflections	Δρ_min = −0.61 e Å⁻³
235 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 > 2sigma(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
C1	1.7277 (4)	−0.0681 (5)	0.4420 (5)	0.0259 (13)
C2	1.7404 (3)	−0.1470 (5)	0.3394 (4)	0.0278 (12)
C3	1.8284 (4)	−0.1974 (5)	0.3174 (5)	0.0304 (14)
H3	1.8371	−0.2486	0.2495	0.036*
C4	1.9030 (4)	−0.1720 (6)	0.3955 (5)	0.0325 (14)
C5	1.8912 (4)	−0.0994 (5)	0.4983 (5)	0.0379 (15)
H5	1.9407	−0.0852	0.5521	0.045*
C6	1.8029 (4)	−0.0477 (6)	0.5196 (5)	0.0377 (15)
H6	1.7946	0.0021	0.5884	0.045*
C7	2.1261 (4)	−0.2540 (6)	0.2792 (5)	0.0383 (15)
H7	2.1418	−0.3268	0.3305	0.046*
C8	2.0429 (4)	−0.1863 (5)	0.2862 (5)	0.0309 (14)
C9	2.0170 (4)	−0.0799 (5)	0.2099 (5)	0.0392 (15)
H9	1.9603	−0.0350	0.2153	0.047*
C10	2.0772 (4)	−0.0415 (6)	0.1251 (5)	0.0361 (15)
H10	2.0598	0.0288	0.0722	0.043*
C11	2.1623 (4)	−0.1044 (5)	0.1169 (5)	0.0299 (13)
C12	2.1871 (4)	−0.2131 (6)	0.1944 (5)	0.0392 (15)
H12	2.2439	−0.2579	0.1893	0.047*
C13	1.6620 (4)	−0.1895 (5)	0.2550 (5)	0.0263 (13)
C14	1.6385 (4)	0.0012 (5)	0.4680 (5)	0.0271 (13)
C15	2.2308 (4)	−0.0583 (6)	0.0309 (5)	0.0346 (14)
O1	1.5943 (2)	−0.2597 (3)	0.2936 (3)	0.0293 (9)
O2	1.6686 (2)	−0.1614 (4)	0.1480 (3)	0.0396 (10)
O3	1.5760 (2)	0.0121 (3)	0.3846 (3)	0.0296 (9)
O4	1.6298 (2)	0.0468 (3)	0.5707 (3)	0.0319 (9)
O5	1.9905 (2)	−0.2297 (4)	0.3788 (3)	0.0389 (10)
O6	2.1982 (3)	0.0438 (4)	−0.0387 (3)	0.0469 (11)
H6A	2.2434	0.0675	−0.0795	0.070*
O7	2.3071 (3)	−0.1081 (4)	0.0223 (3)	0.0488 (12)
O8	1.4474 (2)	−0.0499 (3)	0.2018 (3)	0.0369 (10)
H8A	1.4251	−0.0932	0.1424	0.055*
H8B	1.4165	0.0250	0.2083	0.055*
O9	1.3925 (2)	−0.3232 (3)	0.3192 (3)	0.0335 (9)
H9A	1.4080	−0.3880	0.2729	0.050*
H9B	1.3696	−0.3617	0.3786	0.050*
O10	1.5100 (2)	−0.2415 (3)	0.5250 (3)	0.0353 (10)
H10A	1.5400	−0.3082	0.5583	0.053*
H10B	1.4919	−0.1802	0.5722	0.053*
Co1	1.47938 (5)	−0.15569 (7)	0.35848 (6)	0.0266 (2)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.028 (3)	0.023 (3)	0.027 (3)	−0.003 (3)	0.008 (3)	−0.001 (2)
C2	0.021 (3)	0.032 (3)	0.031 (3)	−0.001 (3)	0.006 (2)	0.004 (3)
C3	0.036 (4)	0.028 (3)	0.028 (3)	−0.001 (3)	0.012 (3)	−0.003 (2)
C4	0.022 (3)	0.038 (3)	0.038 (4)	−0.004 (3)	0.010 (3)	0.014 (3)
C5	0.037 (4)	0.042 (3)	0.035 (4)	−0.005 (3)	0.004 (3)	0.000 (3)
C6	0.037 (4)	0.042 (4)	0.034 (4)	0.003 (3)	0.008 (3)	−0.008 (3)
C7	0.026 (3)	0.041 (4)	0.048 (4)	0.003 (3)	0.010 (3)	0.010 (3)
C8	0.021 (3)	0.035 (3)	0.037 (3)	−0.005 (3)	0.007 (2)	0.006 (3)
C9	0.026 (3)	0.034 (3)	0.058 (4)	0.012 (3)	0.008 (3)	0.013 (3)
C10	0.031 (4)	0.038 (3)	0.040 (4)	0.001 (3)	0.008 (3)	0.014 (3)
C11	0.026 (3)	0.031 (3)	0.033 (3)	−0.004 (3)	0.001 (3)	−0.002 (3)
C12	0.029 (4)	0.040 (3)	0.049 (4)	0.014 (3)	0.007 (3)	0.001 (3)
C13	0.031 (3)	0.024 (3)	0.025 (3)	0.004 (2)	0.007 (3)	−0.004 (2)
C14	0.026 (3)	0.025 (3)	0.031 (4)	−0.003 (3)	0.008 (3)	−0.002 (3)
C15	0.033 (4)	0.041 (4)	0.030 (4)	−0.001 (3)	0.005 (3)	−0.005 (3)
O1	0.027 (2)	0.0238 (19)	0.038 (2)	−0.0057 (17)	0.0099 (17)	−0.0047 (17)
O2	0.036 (2)	0.055 (2)	0.028 (2)	−0.013 (2)	0.0070 (17)	0.000 (2)
O3	0.028 (2)	0.027 (2)	0.033 (2)	−0.0039 (18)	0.0031 (18)	−0.0051 (17)
O4	0.033 (2)	0.034 (2)	0.029 (2)	0.0054 (18)	0.0064 (17)	−0.0037 (18)
O5	0.029 (2)	0.046 (2)	0.043 (3)	0.007 (2)	0.0102 (19)	0.0128 (19)
O6	0.037 (3)	0.052 (3)	0.052 (3)	−0.001 (2)	0.018 (2)	0.015 (2)
O7	0.031 (2)	0.070 (3)	0.047 (3)	0.014 (2)	0.018 (2)	0.009 (2)
O8	0.053 (3)	0.031 (2)	0.027 (2)	0.0061 (19)	0.0038 (18)	−0.0044 (17)
O9	0.040 (2)	0.026 (2)	0.036 (2)	−0.0057 (18)	0.0120 (17)	−0.0065 (17)
O10	0.047 (3)	0.031 (2)	0.028 (2)	0.0081 (19)	0.0044 (18)	0.0052 (17)
Co1	0.0294 (4)	0.0233 (4)	0.0278 (4)	−0.0011 (4)	0.0072 (3)	−0.0018 (4)

Geometric parameters (Å, º) top

C1—C6	1.382 (7)	C11—C15	1.492 (7)
C1—C2	1.412 (7)	C12—H12	0.9300
C1—C14	1.491 (7)	C13—O2	1.258 (6)
C2—C3	1.394 (6)	C13—O1	1.282 (5)
C2—C13	1.506 (7)	C14—O4	1.262 (6)
C3—C4	1.387 (7)	C14—O3	1.283 (6)
C3—H3	0.9300	C15—O7	1.210 (6)
C4—C5	1.379 (7)	C15—O6	1.330 (6)
C4—O5	1.401 (6)	O1—Co1	2.101 (3)
C5—C6	1.402 (7)	O3—Co1	2.138 (3)
C5—H5	0.9300	O4—Co1ⁱ	2.085 (3)
C6—H6	0.9300	O6—H6A	0.8506
C7—C8	1.372 (7)	O8—Co1	2.086 (4)
C7—C12	1.395 (7)	O8—H8A	0.8445
C7—H7	0.9300	O8—H8B	0.8482
C8—C9	1.378 (7)	O9—Co1	2.071 (3)
C8—O5	1.392 (6)	O9—H9A	0.8509
C9—C10	1.381 (7)	O9—H9B	0.8511
C9—H9	0.9300	O10—Co1	2.096 (4)
C10—C11	1.376 (7)	O10—H10A	0.8500
C10—H10	0.9300	O10—H10B	0.8453
C11—C12	1.399 (7)	Co1—O4ⁱ	2.085 (3)

C6—C1—C2	118.4 (5)	O2—C13—C2	118.2 (5)
C6—C1—C14	118.1 (5)	O1—C13—C2	119.0 (5)
C2—C1—C14	123.4 (5)	O4—C14—O3	124.2 (5)
C3—C2—C1	119.4 (5)	O4—C14—C1	117.6 (5)
C3—C2—C13	117.1 (5)	O3—C14—C1	118.2 (5)
C1—C2—C13	123.3 (4)	O7—C15—O6	122.5 (5)
C4—C3—C2	120.8 (5)	O7—C15—C11	125.0 (6)
C4—C3—H3	119.6	O6—C15—C11	112.5 (5)
C2—C3—H3	119.6	C13—O1—Co1	120.2 (3)
C5—C4—C3	120.7 (5)	C14—O3—Co1	118.3 (3)
C5—C4—O5	117.5 (5)	C14—O4—Co1ⁱ	130.0 (4)
C3—C4—O5	121.5 (5)	C8—O5—C4	120.8 (4)
C4—C5—C6	118.4 (5)	C15—O6—H6A	105.3
C4—C5—H5	120.8	Co1—O8—H8A	120.7
C6—C5—H5	120.8	Co1—O8—H8B	115.5
C1—C6—C5	122.3 (5)	H8A—O8—H8B	107.6
C1—C6—H6	118.9	Co1—O9—H9A	121.4
C5—C6—H6	118.9	Co1—O9—H9B	114.6
C8—C7—C12	119.5 (5)	H9A—O9—H9B	107.6
C8—C7—H7	120.2	Co1—O10—H10A	141.2
C12—C7—H7	120.2	Co1—O10—H10B	104.3
C7—C8—C9	121.5 (5)	H10A—O10—H10B	113.7
C7—C8—O5	114.5 (5)	O9—Co1—O4ⁱ	90.40 (14)
C9—C8—O5	124.0 (5)	O9—Co1—O8	94.71 (14)
C8—C9—C10	118.5 (5)	O4ⁱ—Co1—O8	87.08 (14)
C8—C9—H9	120.7	O9—Co1—O10	89.59 (13)
C10—C9—H9	120.7	O4ⁱ—Co1—O10	88.57 (14)
C11—C10—C9	121.8 (5)	O8—Co1—O10	173.90 (14)
C11—C10—H10	119.1	O9—Co1—O1	92.25 (14)
C9—C10—H10	119.1	O4ⁱ—Co1—O1	176.92 (15)
C10—C11—C12	118.9 (5)	O8—Co1—O1	94.26 (14)
C10—C11—C15	122.6 (5)	O10—Co1—O1	89.89 (14)
C12—C11—C15	118.5 (5)	O9—Co1—O3	174.56 (13)
C7—C12—C11	119.7 (5)	O4ⁱ—Co1—O3	94.21 (14)
C7—C12—H12	120.2	O8—Co1—O3	82.66 (14)
C11—C12—H12	120.2	O10—Co1—O3	93.40 (14)
O2—C13—O1	122.6 (5)	O1—Co1—O3	83.22 (14)

Symmetry code: (i) −x+3, −y, −z+1.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O8—H8B···O1ⁱⁱ	0.85	2.06	2.839 (5)	152
O6—H6A···O2ⁱⁱⁱ	0.85	1.77	2.598 (5)	165
O8—H8A···O7^iv	0.84	2.14	2.865 (6)	144
O9—H9A···O3^v	0.85	2.06	2.861 (5)	157
O9—H9B···O7^vi	0.85	1.93	2.754 (5)	163
O10—H10A···O2^vii	0.85	2.10	2.788 (5)	138
O10—H10B···O3ⁱ	0.85	1.96	2.746 (5)	155

Symmetry codes: (i) −x+3, −y, −z+1; (ii) −x+3, y+1/2, −z+1/2; (iii) −x+4, −y, −z; (iv) x−1, y, z; (v) −x+3, y−1/2, −z+1/2; (vi) x−1, −y−1/2, z+1/2; (vii) x, −y−1/2, z+1/2.

Experimental details

Crystal data
Chemical formula	[Co₂(C₁₅H₈O₇)₂(H₂O)₆]
M_r	826.38
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	293
a, b, c (Å)	14.451 (11), 9.558 (7), 11.404 (9)
β (°)	92.749 (15)
V (Å³)	1573 (2)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.15
Crystal size (mm)	0.15 × 0.12 × 0.10

Data collection
Diffractometer	Bruker APEXII diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 2003)
T_min, T_max	0.847, 0.894
No. of measured, independent and observed [I > 2σ(I)] reflections	8135, 3087, 1591
R_int	0.115
(sin θ/λ)_max (Å⁻¹)	0.617

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.059, 0.116, 0.90
No. of reflections	3087
No. of parameters	235
No. of restraints	9
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.41, −0.61

Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2001), 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
O8—H8B···O1ⁱ	0.85	2.06	2.839 (5)	151.7
O6—H6A···O2ⁱⁱ	0.85	1.77	2.598 (5)	164.5
O8—H8A···O7ⁱⁱⁱ	0.84	2.14	2.865 (6)	143.9
O9—H9A···O3^iv	0.85	2.06	2.861 (5)	157.4
O9—H9B···O7^v	0.85	1.93	2.754 (5)	162.7
O10—H10A···O2^vi	0.85	2.10	2.788 (5)	137.9
O10—H10B···O3^vii	0.85	1.96	2.746 (5)	154.6

Symmetry codes: (i) −x+3, y+1/2, −z+1/2; (ii) −x+4, −y, −z; (iii) x−1, y, z; (iv) −x+3, y−1/2, −z+1/2; (v) x−1, −y−1/2, z+1/2; (vi) x, −y−1/2, z+1/2; (vii) −x+3, −y, −z+1.

Acknowledgements

The author thanks the University of Science and Technology, Beijing, for support.

References

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