Bis[2-(2-pyridylmethyl­eneamino)benzene­sulfonato-κ3N,N′,O]cadmium(II) dihydrate

Ou-Yang, M.; Huang, X.-R.; Zhang, Y.-L.; Jiang, Y.-M.

doi:10.1107/S1600536808034387

metal-organic compounds

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ISSN: 2056-9890

Volume 64| Part 11| November 2008| Page m1461

doi:10.1107/S1600536808034387

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Bis[2-(2-pyridylmethyleneamino)benzenesulfonato-κ³N,N′,O]cadmium(II) dihydrate

Miao Ou-Yang,^a Xue-Ren Huang,^a Yun-Liang Zhang ^b and Yi-Min Jiang ^a ^*

^aCollege of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin, Guangxi 541004, People's Republic of China, and ^bSchool of Medicine, Shao Yang Medical College, Shaoyang 422000, People's Republic of China
^*Correspondence e-mail: ouyangmiao123456@126.com

(Received 13 September 2008; accepted 21 October 2008; online 25 October 2008)

The title complex, [Cd(Paba)₂]·2H₂O or [Cd(C₁₂H₉N₂O₃S)₂]·2H₂O, was synthesized by the reaction of the potassium salt of 2-(2-pyridylmethyleneamino)benzenesulfonic acid (PabaK) with CdCl₂·2.5H₂O in methanol. The Cd^II atom lies on a crystallographic twofold axis and is coordinated by four N atoms and two O atoms from two deprotonated tridentate 2-(2-pyridylmethyleneamino)benzenesulfonate ligands in a slightly distorted octahedral environment. There are extensive hydrogen bonds of the type O—H⋯O between the uncoordinated water molecules and the sulfonate O atoms, through which the complex forms a layered structure parallel to (001).

Related literature

For the isostructural Zn compound, see: Cai et al. (2008 ). For synthesis of the ligand, see: Casella & Gullotti (1986 ).

Experimental

Crystal data

[Cd(C₁₂H₉N₂O₃S)₂]·2H₂O
M_r = 670.98
Orthorhombic, P b c n
a = 20.255 (4) Å
b = 7.8924 (17) Å
c = 16.475 (3) Å
V = 2633.7 (9) Å³
Z = 4
Mo Kα radiation
μ = 1.04 mm⁻¹
T = 291 (2) K
0.23 × 0.08 × 0.05 mm

Data collection

Bruker SMART CCD area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.798, T_max = 0.950
18106 measured reflections
2443 independent reflections
1672 reflections with I > 2σ(I)
R_int = 0.075

Refinement

R[F² > 2σ(F²)] = 0.034
wR(F²) = 0.075
S = 1.04
2443 reflections
177 parameters
H-atom parameters constrained
Δρ_max = 0.33 e Å⁻³
Δρ_min = −0.33 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O4—H2W⋯O3ⁱ	0.83	2.27	2.968 (5)	142
O4—H1W⋯O1	0.85	2.01	2.863 (5)	179
Symmetry code: (i) $[-x+{\script{3\over 2}}, y-{\script{1\over 2}}, z]$ .

Data collection: SMART (Bruker, 2004 ); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536808034387/pk2123sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808034387/pk2123Isup2.hkl

checkCIF report

Comment top

The title complex (Fig. 1) is isostructural with [Zn(Paba)₂].2H₂O, whose structure has been described in detail (Cai, et al., 2008). The six-coordinated Cd^II lies on a crystallographic 2-fold axis of rotation and two deprotonated PabaH anions coordinate to Cd^II in a facial arrangement as N,N',O-tridentate donor ligands.

The O—H donor group of the guest waters and the S=O acceptor group of the Paba ligands participate in the hydrogen bonding and form a two-dimensional network in the ab plane (Fig. 2).

Related literature top

For general background, see: Cai et al. (2008); Casella & Gullotti (1986).

Experimental top

The potassium salt of 2-(2- pyridylmethyleneamino)benzenesulfonic acid(PabaK) was synthesized according to the literature methods (Casella & Gullotti, 1986).

For the preparation of the title complex, the ligand PabaK (1 mmol, 0.30 g) was dissolved in methanol (10 ml) at 333 K and an aqueous solution (10 ml) containing CdCl₂.2.5H₂O (0.5 mmol, 0.12 g) was added. The resulting mixture was stirred at 333 K for 4 h. Then the mixture was filtrated and the filtrate was left to stand at room temperature. Yellow crystals suitable for X-ray diffraction were obtained after a week in a yield of 35%. Elemental analysis,.found (%): C, 46.91; H, 3.36; N, 8.30; S, 9.45; calc (%): C, 42.96; H, 3.31; N, 8.35; S, 9.56.

Computing details top

Data collection: SMART (Bruker, 2004); cell refinement: SMART (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

	Fig. 1. An ellipsoid plot (30% probability) showing the numbering scheme. Dashed lines indicate hydrogen bonds. Symmetry code: 1# -x + 1, y, -z + 3/2.
	Fig. 2. 2-D network, as viewed down the c axis. Dashed lines indicate hydrogen bonds.

Bis[2-(2-pyridylmethyleneamino)benzenesulfonato- κ³N,N',O]cadmium(II) dihydrate top

Crystal data top

[Cd(C₁₂H₉N₂O₃S)₂]·2H₂O	F(000) = 1352
M_r = 670.98	D_x = 1.692 Mg m⁻³
Orthorhombic, Pbcn	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2n 2ab	Cell parameters from 2541 reflections
a = 20.255 (4) Å	θ = 2.5–23.2°
b = 7.8924 (17) Å	µ = 1.04 mm⁻¹
c = 16.475 (3) Å	T = 291 K
V = 2633.7 (9) Å³	Block, colourless
Z = 4	0.23 × 0.08 × 0.05 mm

Data collection top

Bruker SMART CCD area-detector diffractometer	2443 independent reflections
Radiation source: fine-focus sealed tube	1672 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.075
ϕ and ω scans	θ_max = 25.5°, θ_min = 2.5°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −24→24
T_min = 0.798, T_max = 0.950	k = −9→9
18106 measured reflections	l = −19→19

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)] = 0.034	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.075	H-atom parameters constrained
S = 1.04	w = 1/[σ²(F_o²) + (0.0212P)² + 3.1957P] where P = (F_o² + 2F_c²)/3
2443 reflections	(Δ/σ)_max = 0.001
177 parameters	Δρ_max = 0.33 e Å⁻³
0 restraints	Δρ_min = −0.33 e Å⁻³

Crystal data top

[Cd(C₁₂H₉N₂O₃S)₂]·2H₂O	V = 2633.7 (9) Å³
M_r = 670.98	Z = 4
Orthorhombic, Pbcn	Mo Kα radiation
a = 20.255 (4) Å	µ = 1.04 mm⁻¹
b = 7.8924 (17) Å	T = 291 K
c = 16.475 (3) Å	0.23 × 0.08 × 0.05 mm

Data collection top

Bruker SMART CCD area-detector diffractometer	2443 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	1672 reflections with I > 2σ(I)
T_min = 0.798, T_max = 0.950	R_int = 0.075
18106 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.034	0 restraints
wR(F²) = 0.075	H-atom parameters constrained
S = 1.04	Δρ_max = 0.33 e Å⁻³
2443 reflections	Δρ_min = −0.33 e Å⁻³
177 parameters

Special details top

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
Cd1	0.5000	0.68040 (5)	0.7500	0.03074 (13)
S2	0.62752 (5)	0.83468 (15)	0.66388 (6)	0.0372 (3)
N1	0.59409 (15)	0.7358 (4)	0.83494 (18)	0.0302 (7)
C12	0.60345 (19)	0.6263 (5)	0.8904 (2)	0.0382 (10)
H12	0.6393	0.6381	0.9253	0.046*
N3	0.50869 (16)	0.4691 (4)	0.84673 (18)	0.0373 (8)
O1	0.64757 (15)	0.6598 (4)	0.67446 (17)	0.0523 (8)
O2	0.55529 (12)	0.8506 (4)	0.66248 (15)	0.0413 (7)
O3	0.65696 (14)	0.9203 (4)	0.59556 (16)	0.0509 (8)
O4	0.69916 (18)	0.4179 (6)	0.5615 (2)	0.1121 (17)
H1W	0.6840	0.4904	0.5948	0.168*
H2W	0.7324	0.3778	0.5833	0.168*
C1	0.65210 (16)	0.9451 (5)	0.7530 (3)	0.0342 (9)
C2	0.63521 (18)	0.8827 (5)	0.8292 (2)	0.0319 (9)
C3	0.6563 (2)	0.9697 (6)	0.8973 (3)	0.0455 (11)
H3	0.6462	0.9281	0.9486	0.055*
C4	0.6920 (2)	1.1170 (6)	0.8899 (3)	0.0552 (13)
H4	0.7057	1.1748	0.9361	0.066*
C5	0.7074 (2)	1.1785 (6)	0.8147 (3)	0.0561 (13)
H5	0.7310	1.2790	0.8099	0.067*
C6	0.6880 (2)	1.0922 (5)	0.7457 (3)	0.0481 (11)
H6	0.6992	1.1333	0.6947	0.058*
C7	0.55885 (19)	0.4823 (5)	0.9002 (2)	0.0334 (9)
C8	0.5667 (2)	0.3684 (5)	0.9628 (2)	0.0445 (11)
H8	0.6020	0.3780	0.9985	0.053*
C9	0.5212 (2)	0.2402 (6)	0.9716 (3)	0.0520 (13)
H9	0.5253	0.1625	1.0138	0.062*
C10	0.4700 (2)	0.2279 (5)	0.9178 (3)	0.0491 (12)
H10	0.4387	0.1424	0.9232	0.059*
C11	0.4654 (2)	0.3423 (6)	0.8565 (3)	0.0465 (11)
H11	0.4308	0.3322	0.8197	0.056*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cd1	0.0291 (2)	0.0362 (2)	0.0269 (2)	0.000	−0.00588 (19)	0.000
S2	0.0355 (6)	0.0497 (7)	0.0265 (5)	−0.0025 (6)	−0.0008 (4)	0.0002 (5)
N1	0.0246 (16)	0.0403 (19)	0.0257 (17)	−0.0062 (15)	−0.0016 (14)	0.0016 (16)
C12	0.032 (2)	0.055 (3)	0.027 (2)	0.000 (2)	−0.0072 (18)	−0.001 (2)
N3	0.043 (2)	0.0398 (19)	0.0289 (17)	−0.0012 (18)	−0.0090 (17)	0.0029 (15)
O1	0.065 (2)	0.047 (2)	0.0442 (18)	0.0116 (16)	−0.0022 (15)	−0.0107 (15)
O2	0.0329 (15)	0.059 (2)	0.0322 (15)	−0.0061 (14)	−0.0076 (12)	0.0112 (14)
O3	0.0464 (18)	0.077 (2)	0.0296 (16)	−0.0113 (17)	0.0048 (14)	0.0037 (16)
O4	0.066 (2)	0.168 (4)	0.102 (3)	0.043 (3)	−0.025 (2)	−0.068 (3)
C1	0.0245 (18)	0.044 (2)	0.034 (2)	0.0008 (16)	−0.004 (2)	−0.004 (2)
C2	0.024 (2)	0.037 (2)	0.034 (2)	0.0001 (18)	−0.0021 (18)	−0.0005 (19)
C3	0.042 (3)	0.062 (3)	0.032 (2)	−0.007 (2)	0.001 (2)	−0.004 (2)
C4	0.053 (3)	0.070 (3)	0.043 (3)	−0.020 (3)	−0.002 (2)	−0.019 (2)
C5	0.048 (3)	0.058 (3)	0.062 (3)	−0.026 (3)	0.002 (2)	−0.011 (3)
C6	0.042 (2)	0.057 (3)	0.045 (3)	−0.012 (2)	0.001 (2)	0.000 (3)
C7	0.035 (2)	0.036 (2)	0.029 (2)	−0.0003 (19)	−0.0025 (18)	−0.0014 (18)
C8	0.052 (3)	0.047 (3)	0.035 (2)	0.006 (2)	−0.011 (2)	0.005 (2)
C9	0.081 (4)	0.037 (3)	0.038 (3)	0.002 (2)	−0.007 (2)	0.010 (2)
C10	0.071 (3)	0.036 (3)	0.040 (3)	−0.013 (2)	−0.005 (2)	0.001 (2)
C11	0.055 (3)	0.045 (3)	0.039 (3)	−0.013 (2)	−0.010 (2)	0.004 (2)

Geometric parameters (Å, º) top

Cd1—O2ⁱ	2.267 (3)	C1—C6	1.375 (5)
Cd1—O2	2.267 (3)	C1—C2	1.390 (5)
Cd1—N3ⁱ	2.313 (3)	C2—C3	1.383 (5)
Cd1—N3	2.313 (3)	C3—C4	1.374 (6)
Cd1—N1ⁱ	2.405 (3)	C3—H3	0.9300
Cd1—N1	2.405 (3)	C4—C5	1.367 (6)
S2—O3	1.442 (3)	C4—H4	0.9300
S2—O1	1.449 (3)	C5—C6	1.381 (6)
S2—O2	1.469 (3)	C5—H5	0.9300
S2—C1	1.779 (4)	C6—H6	0.9300
N1—C12	1.272 (5)	C7—C8	1.377 (5)
N1—C2	1.431 (5)	C8—C9	1.376 (6)
C12—C7	1.461 (5)	C8—H8	0.9300
C12—H12	0.9300	C9—C10	1.368 (6)
N3—C11	1.340 (5)	C9—H9	0.9300
N3—C7	1.349 (5)	C10—C11	1.359 (6)
O4—H1W	0.8502	C10—H10	0.9300
O4—H2W	0.8263	C11—H11	0.9300

O2ⁱ—Cd1—O2	107.31 (15)	C6—C1—S2	119.3 (4)
O2ⁱ—Cd1—N3ⁱ	145.88 (11)	C2—C1—S2	120.2 (3)
O2—Cd1—N3ⁱ	91.52 (11)	C3—C2—C1	118.7 (4)
O2ⁱ—Cd1—N3	91.52 (11)	C3—C2—N1	121.9 (4)
O2—Cd1—N3	145.88 (11)	C1—C2—N1	119.3 (3)
N3ⁱ—Cd1—N3	87.74 (16)	C4—C3—C2	120.7 (4)
O2ⁱ—Cd1—N1ⁱ	82.58 (10)	C4—C3—H3	119.6
O2—Cd1—N1ⁱ	85.04 (10)	C2—C3—H3	119.6
N3ⁱ—Cd1—N1ⁱ	70.73 (11)	C5—C4—C3	120.0 (4)
N3—Cd1—N1ⁱ	126.32 (11)	C5—C4—H4	120.0
O2ⁱ—Cd1—N1	85.04 (10)	C3—C4—H4	120.0
O2—Cd1—N1	82.58 (10)	C4—C5—C6	120.4 (4)
N3ⁱ—Cd1—N1	126.32 (11)	C4—C5—H5	119.8
N3—Cd1—N1	70.73 (11)	C6—C5—H5	119.8
N1ⁱ—Cd1—N1	159.04 (16)	C1—C6—C5	119.6 (5)
O3—S2—O1	115.11 (19)	C1—C6—H6	120.2
O3—S2—O2	111.07 (17)	C5—C6—H6	120.2
O1—S2—O2	111.26 (18)	N3—C7—C8	121.7 (4)
O3—S2—C1	107.40 (18)	N3—C7—C12	117.0 (4)
O1—S2—C1	106.80 (18)	C8—C7—C12	121.3 (4)
O2—S2—C1	104.47 (17)	C9—C8—C7	118.8 (4)
C12—N1—C2	120.8 (3)	C9—C8—H8	120.6
C12—N1—Cd1	114.4 (3)	C7—C8—H8	120.6
C2—N1—Cd1	124.8 (2)	C10—C9—C8	119.4 (4)
N1—C12—C7	121.1 (4)	C10—C9—H9	120.3
N1—C12—H12	119.5	C8—C9—H9	120.3
C7—C12—H12	119.5	C11—C10—C9	119.2 (4)
C11—N3—C7	118.2 (3)	C11—C10—H10	120.4
C11—N3—Cd1	124.8 (3)	C9—C10—H10	120.4
C7—N3—Cd1	116.9 (3)	N3—C11—C10	122.7 (4)
S2—O2—Cd1	115.56 (15)	N3—C11—H11	118.6
H1W—O4—H2W	105.8	C10—C11—H11	118.6
C6—C1—C2	120.5 (4)

O2ⁱ—Cd1—N1—C12	93.5 (3)	O2—S2—C1—C6	−113.1 (3)
O2—Cd1—N1—C12	−158.3 (3)	O3—S2—C1—C2	−174.9 (3)
N3ⁱ—Cd1—N1—C12	−71.9 (3)	O1—S2—C1—C2	−50.9 (3)
N3—Cd1—N1—C12	0.1 (3)	O2—S2—C1—C2	67.1 (3)
N1ⁱ—Cd1—N1—C12	147.4 (3)	C6—C1—C2—C3	−1.2 (6)
O2ⁱ—Cd1—N1—C2	−82.9 (3)	S2—C1—C2—C3	178.6 (3)
O2—Cd1—N1—C2	25.3 (3)	C6—C1—C2—N1	175.8 (3)
N3ⁱ—Cd1—N1—C2	111.7 (3)	S2—C1—C2—N1	−4.3 (5)
N3—Cd1—N1—C2	−176.3 (3)	C12—N1—C2—C3	−39.6 (5)
N1ⁱ—Cd1—N1—C2	−29.0 (3)	Cd1—N1—C2—C3	136.5 (3)
C2—N1—C12—C7	175.6 (3)	C12—N1—C2—C1	143.4 (4)
Cd1—N1—C12—C7	−0.9 (5)	Cd1—N1—C2—C1	−40.4 (4)
O2ⁱ—Cd1—N3—C11	91.9 (3)	C1—C2—C3—C4	1.4 (6)
O2—Cd1—N3—C11	−143.3 (3)	N1—C2—C3—C4	−175.5 (4)
N3ⁱ—Cd1—N3—C11	−53.9 (3)	C2—C3—C4—C5	−0.4 (7)
N1ⁱ—Cd1—N3—C11	10.0 (4)	C3—C4—C5—C6	−0.9 (7)
N1—Cd1—N3—C11	176.1 (3)	C2—C1—C6—C5	−0.1 (6)
O2ⁱ—Cd1—N3—C7	−83.5 (3)	S2—C1—C6—C5	−179.9 (3)
O2—Cd1—N3—C7	41.3 (4)	C4—C5—C6—C1	1.1 (7)
N3ⁱ—Cd1—N3—C7	130.7 (3)	C11—N3—C7—C8	0.9 (6)
N1ⁱ—Cd1—N3—C7	−165.4 (2)	Cd1—N3—C7—C8	176.6 (3)
N1—Cd1—N3—C7	0.7 (3)	C11—N3—C7—C12	−177.2 (4)
O3—S2—O2—Cd1	168.04 (16)	Cd1—N3—C7—C12	−1.4 (4)
O1—S2—O2—Cd1	38.4 (2)	N1—C12—C7—N3	1.6 (6)
C1—S2—O2—Cd1	−76.5 (2)	N1—C12—C7—C8	−176.5 (4)
O2ⁱ—Cd1—O2—S2	118.00 (19)	N3—C7—C8—C9	−1.3 (6)
N3ⁱ—Cd1—O2—S2	−90.86 (18)	C12—C7—C8—C9	176.7 (4)
N3—Cd1—O2—S2	−2.6 (3)	C7—C8—C9—C10	0.6 (7)
N1ⁱ—Cd1—O2—S2	−161.36 (19)	C8—C9—C10—C11	0.4 (7)
N1—Cd1—O2—S2	35.59 (17)	C7—N3—C11—C10	0.2 (6)
O3—S2—C1—C6	4.9 (4)	Cd1—N3—C11—C10	−175.2 (3)
O1—S2—C1—C6	128.9 (3)	C9—C10—C11—N3	−0.9 (7)

Symmetry code: (i) −x+1, y, −z+3/2.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O4—H2W···O3ⁱⁱ	0.83	2.27	2.968 (5)	142
O4—H1W···O1	0.85	2.01	2.863 (5)	179

Symmetry code: (ii) −x+3/2, y−1/2, z.

Experimental details

Crystal data
Chemical formula	[Cd(C₁₂H₉N₂O₃S)₂]·2H₂O
M_r	670.98
Crystal system, space group	Orthorhombic, Pbcn
Temperature (K)	291
a, b, c (Å)	20.255 (4), 7.8924 (17), 16.475 (3)
V (Å³)	2633.7 (9)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	1.04
Crystal size (mm)	0.23 × 0.08 × 0.05

Data collection
Diffractometer	Bruker SMART CCD area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.798, 0.950
No. of measured, independent and observed [I > 2σ(I)] reflections	18106, 2443, 1672
R_int	0.075
(sin θ/λ)_max (Å⁻¹)	0.606

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.034, 0.075, 1.04
No. of reflections	2443
No. of parameters	177
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.33, −0.33

Computer programs: SMART (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O4—H2W···O3ⁱ	0.83	2.27	2.968 (5)	141.8
O4—H1W···O1	0.85	2.01	2.863 (5)	179.3

Symmetry code: (i) −x+3/2, y−1/2, z.

Acknowledgements

This work was funded by the Guangxi Science Foundation of the Guangxi Zhuang Autonomous Region of the People's Republic of China (grant No. 0731053).

References

Bruker (2004). SMART and SAINT. Bruker AXS inc., Madison, Wisconsin, USA. Google Scholar
Cai, C.-X., Ou-Yang, M., Zhao, Z.-Y. & Jiang, Y.-M. (2008). Acta Cryst. E64, m1195. Web of Science CSD CrossRef IUCr Journals Google Scholar
Casella, L. & Gullotti, M. (1986). Inorg. Chem. 25, 1293–1303. CrossRef CAS Web of Science Google Scholar
Sheldrick, G. M. (1996). SADABS. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar

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