metal-organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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Poly[di­aqua­(μ3-1H-benzimidazole-5,6-di­carboxyl­ato-κ4N3:O5,O6:O6′)magnesium(II)]

aCollege of Food Science and Technology, Guang Dong Ocean University, Zhanjiang 524088, People's Republic of China, bCollege of Agriculture, Guang Dong Ocean University, Zhanjiang 524088, People's Republic of China, and cCollege of Science, Guang Dong Ocean University, Zhanjiang 524088, People's Republic of China
*Correspondence e-mail: songwd60@163.com

(Received 28 December 2009; accepted 8 January 2010; online 13 January 2010)

In the title complex, [Mg(C9H4N2O4)(H2O)2]n, the MgII atom is six-coordinated by one N and three O atoms from three different 1H-benzimidazole-5,6-dicarboxyl­ate ligands and two O atoms from two water mol­ecules, forming a slightly distorted octa­hedral geometry. The ligand links the MgII centres into a three-dimensional network. Extensive N—H⋯O and O—H⋯O hydrogen bonds exist between the ligands and water mol­ecules, stabilizing the crystal structure.

Related literature

For related structures of 1H-benzimidazole-5,6-dicarboxyl­ate complexes, see: Song, Wang, Hu et al. (2009[Song, W.-D., Wang, H., Hu, S.-W., Qin, P.-W. & Li, S.-J. (2009). Acta Cryst. E65, m701.]); Song, Wang, Li et al. (2009[Song, W.-D., Wang, H., Li, S.-J., Qin, P.-W. & Hu, S.-W. (2009). Acta Cryst. E65, m702.]); Song, Wang, Qin et al. (2009[Song, W.-D., Wang, H., Qin, P.-W., Li, S.-J. & Hu, S.-W. (2009). Acta Cryst. E65, m672.]); Wang et al. (2009[Wang, H., Song, W.-D., Li, S.-J., Miao, D.-L. & Liu, J. (2009). Acta Cryst. E65, m1423.]).

[Scheme 1]

Experimental

Crystal data
  • [Mg(C9H4N2O4)(H2O)2]

  • Mr = 264.48

  • Monoclinic, C c

  • a = 7.4793 (15) Å

  • b = 18.958 (4) Å

  • c = 7.3132 (15) Å

  • β = 99.38 (3)°

  • V = 1023.1 (4) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 0.20 mm−1

  • T = 293 K

  • 0.30 × 0.25 × 0.21 mm

Data collection
  • Rigaku/MSC Mercury CCD diffractometer

  • Absorption correction: multi-scan (REQAB; Jacobson, 1998[Jacobson, R. (1998). REQAB. Private communication to Molecular Structure Corporation, The Woodlands, Texas, USA.]) Tmin = 0.943, Tmax = 0.960

  • 4611 measured reflections

  • 1143 independent reflections

  • 1096 reflections with I > 2σ(I)

  • Rint = 0.031

Refinement
  • R[F2 > 2σ(F2)] = 0.036

  • wR(F2) = 0.090

  • S = 1.06

  • 1143 reflections

  • 163 parameters

  • 2 restraints

  • H-atom parameters constrained

  • Δρmax = 0.38 e Å−3

  • Δρmin = −0.25 e Å−3

Table 1
Selected bond lengths (Å)

Mg1—N1 2.195 (3)
Mg1—O1i 2.051 (3)
Mg1—O3i 2.106 (3)
Mg1—O4ii 2.113 (3)
Mg1—O1W 2.063 (3)
Mg1—O2W 2.074 (3)
Symmetry codes: (i) [x, -y+1, z-{\script{1\over 2}}]; (ii) [x+{\script{1\over 2}}, y+{\script{1\over 2}}, z].

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
N3—H3⋯O1iii 0.86 2.29 2.992 (4) 138
O1W—H1W⋯O2iv 0.84 1.84 2.651 (4) 163
O1W—H2W⋯O3ii 0.84 1.92 2.734 (4) 164
O2W—H3W⋯O4iv 0.84 2.27 3.068 (4) 160
O2W—H4W⋯O2v 0.84 1.87 2.685 (4) 164
Symmetry codes: (ii) [x+{\script{1\over 2}}, y+{\script{1\over 2}}, z]; (iii) [x-1, -y+1, z-{\script{1\over 2}}]; (iv) [x, -y+1, z+{\script{1\over 2}}]; (v) [x-{\script{1\over 2}}, y+{\script{1\over 2}}, z].

Data collection: CrystalStructure (Rigaku/MSC, 2002[Rigaku/MSC (2002). CrystalStructure. Rigaku/MSC, The Woodlands, Texas, USA.]); cell refinement: CrystalStructure; data reduction: CrystalStructure; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); molecular graphics: ORTEPII (Johnson, 1976[Johnson, C. K. (1976). ORTEPII. Report ORNL-5138. Oak Ridge National Laboratory, Tennessee, USA.]) and DIAMOND (Brandenburg, 1999[Brandenburg, K. (1999). DIAMOND. Crystal Impact GbR, Bonn, Germany.]); software used to prepare material for publication: SHELXL97.

Supporting information


Comment top

1H-Benzimidazole-5,6-dicarboxylic acid (H2L) can function as a multidentate ligand and several complexes formed from this ligand have been reported recently, including catena-poly[[diaqua(1,10-phenanthroline-κ2N,N') nickel(II)]-µ-L-κ2N3:O6] (Song, Wang, Hu et al., 2009), pentaaqua(L-κN3)cobalt(II) pentahydrate (Song, Wang, Li et al., 2009), pentaaqua(L-κN3)nickel(II) pentahydrate (Song, Wang, Qin et al., 2009) and tetraaquabis(L-κN3)cobalt(II) dimethylformamide disolvate dihydrate (Wang et al., 2009). However, the Mg complex of the H2L ligand has not been reported up to now.

As shown in Fig. 1, the MgII atom is six-coordinated by one N and three O atoms from three different L ligands, and two O atoms from two water molecules (Table 1), showing a slightly distorted octahedral geometry. The equatorial plane is defined by O1W, O2W, O1i and O3i atoms, while N1 and O4ii occupy the axial positions [symmetry codes: (i) x, 1 - y, -1/2 + z; (ii) 1/2 + x, 1/2 + y, z]. Intermolecular O—H···O and N—H···O hydrogen bonds between the ligand and the coordinated water molecules stabilize the structure (Table 2 and Fig 2).

Related literature top

For related structures of 1H-benzimidazole-5,6-dicarboxylate complexes, see: Song, Wang, Hu et al. (2009); Song, Wang, Li et al. (2009); Song, Wang, Qin et al. (2009); Wang et al. (2009).

Experimental top

A mixture of MgCl2 (1.0 mmol), H2L (0.6 mmol), CH3CN (6 ml) and water (4 ml) was added to a 20 ml Teflon-lined stainless container, which was heated to 150°C and held at that temperature for 5 d. After cooling to room temperature, colourless crystals were recovered by filtration.

Refinement top

C– and N-bound H atoms were placed at calculated positions and treated as riding on the parent C or N atoms, with C—H = 0.93 and N—H = 0.86 Å, and with Uiso(H) = 1.2Ueq(C, N). The water H atoms were located in a difference Fourier map and refined as riding with a distance restraint of O—H = 0.84 Å and with Uiso(H) = 1.5Ueq(O).

Structure description top

1H-Benzimidazole-5,6-dicarboxylic acid (H2L) can function as a multidentate ligand and several complexes formed from this ligand have been reported recently, including catena-poly[[diaqua(1,10-phenanthroline-κ2N,N') nickel(II)]-µ-L-κ2N3:O6] (Song, Wang, Hu et al., 2009), pentaaqua(L-κN3)cobalt(II) pentahydrate (Song, Wang, Li et al., 2009), pentaaqua(L-κN3)nickel(II) pentahydrate (Song, Wang, Qin et al., 2009) and tetraaquabis(L-κN3)cobalt(II) dimethylformamide disolvate dihydrate (Wang et al., 2009). However, the Mg complex of the H2L ligand has not been reported up to now.

As shown in Fig. 1, the MgII atom is six-coordinated by one N and three O atoms from three different L ligands, and two O atoms from two water molecules (Table 1), showing a slightly distorted octahedral geometry. The equatorial plane is defined by O1W, O2W, O1i and O3i atoms, while N1 and O4ii occupy the axial positions [symmetry codes: (i) x, 1 - y, -1/2 + z; (ii) 1/2 + x, 1/2 + y, z]. Intermolecular O—H···O and N—H···O hydrogen bonds between the ligand and the coordinated water molecules stabilize the structure (Table 2 and Fig 2).

For related structures of 1H-benzimidazole-5,6-dicarboxylate complexes, see: Song, Wang, Hu et al. (2009); Song, Wang, Li et al. (2009); Song, Wang, Qin et al. (2009); Wang et al. (2009).

Computing details top

Data collection: CrystalStructure (Rigaku/MSC, 2002); cell refinement: CrystalStructure (Rigaku/MSC, 2002); data reduction: CrystalStructure (Rigaku/MSC, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEPII (Johnson, 1976) and DIAMOND (Brandenburg, 1999); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. The structure of the title compound, showing the 30% probability displacement ellipsoids. [Symmetry codes: (i) x, 1 - y, -1/2 + z; (ii) 1/2 + x, 1/2 + y, z.]
[Figure 2] Fig. 2. A view of the three-dimensional network structure of the title compound. Hydrogen bonds are shown as dashed lines.
Poly[diaqua(µ3-1H-benzimidazole-5,6-dicarboxylato- κ4N3:O5,O6:O6')magnesium(II)] top
Crystal data top
[Mg(C9H4N2O4)(H2O)2]F(000) = 544
Mr = 264.48Dx = 1.717 Mg m3
Monoclinic, CcMo Kα radiation, λ = 0.71073 Å
Hall symbol: C -2ycCell parameters from 4114 reflections
a = 7.4793 (15) Åθ = 3.6–27.5°
b = 18.958 (4) ŵ = 0.20 mm1
c = 7.3132 (15) ÅT = 293 K
β = 99.38 (3)°Block, colourless
V = 1023.1 (4) Å30.30 × 0.25 × 0.21 mm
Z = 4
Data collection top
Rigaku/MSC Mercury CCD
diffractometer
1143 independent reflections
Radiation source: fine-focus sealed tube1096 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.031
ω scansθmax = 27.5°, θmin = 3.6°
Absorption correction: multi-scan
(REQAB; Jacobson, 1998)
h = 99
Tmin = 0.943, Tmax = 0.960k = 2424
4611 measured reflectionsl = 89
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)] = 0.036Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.090H-atom parameters constrained
S = 1.06 w = 1/[σ2(Fo2) + (0.04P)2 + 2P]
where P = (Fo2 + 2Fc2)/3
1143 reflections(Δ/σ)max < 0.001
163 parametersΔρmax = 0.38 e Å3
2 restraintsΔρmin = 0.25 e Å3
Crystal data top
[Mg(C9H4N2O4)(H2O)2]V = 1023.1 (4) Å3
Mr = 264.48Z = 4
Monoclinic, CcMo Kα radiation
a = 7.4793 (15) ŵ = 0.20 mm1
b = 18.958 (4) ÅT = 293 K
c = 7.3132 (15) Å0.30 × 0.25 × 0.21 mm
β = 99.38 (3)°
Data collection top
Rigaku/MSC Mercury CCD
diffractometer
1143 independent reflections
Absorption correction: multi-scan
(REQAB; Jacobson, 1998)
1096 reflections with I > 2σ(I)
Tmin = 0.943, Tmax = 0.960Rint = 0.031
4611 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0362 restraints
wR(F2) = 0.090H-atom parameters constrained
S = 1.06Δρmax = 0.38 e Å3
1143 reflectionsΔρmin = 0.25 e Å3
163 parameters
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Mg10.27807 (16)0.68928 (5)0.63241 (16)0.0172 (3)
O10.4349 (4)0.37147 (14)0.9888 (4)0.0234 (5)
O20.5047 (4)0.37926 (16)0.7087 (4)0.0317 (7)
O30.1320 (4)0.28489 (12)0.8699 (4)0.0237 (6)
O40.0733 (4)0.28304 (12)0.6132 (3)0.0236 (6)
N10.0678 (5)0.61142 (15)0.6633 (5)0.0214 (6)
N30.2035 (5)0.56134 (16)0.6122 (5)0.0271 (7)
H30.31960.55770.58740.033*
C10.0380 (5)0.31481 (16)0.7326 (5)0.0173 (6)
C20.0549 (5)0.39389 (16)0.7123 (5)0.0182 (7)
C30.1002 (5)0.43318 (18)0.6560 (5)0.0223 (7)
H20.21270.41160.62400.027*
C40.0816 (5)0.50629 (18)0.6490 (5)0.0206 (7)
C50.0876 (5)0.53907 (17)0.6828 (5)0.0184 (7)
C60.2438 (5)0.49930 (18)0.7332 (5)0.0185 (7)
H10.35740.52060.75310.022*
C70.2259 (4)0.42738 (16)0.7529 (4)0.0154 (6)
C80.3985 (5)0.38839 (17)0.8204 (5)0.0173 (7)
C90.1073 (6)0.62155 (18)0.6224 (6)0.0262 (8)
H90.15990.66590.60230.031*
O1W0.4663 (4)0.65596 (14)0.8537 (4)0.0289 (6)
H1W0.45730.64080.95980.043*
H2W0.53550.69110.86010.043*
O2W0.1388 (5)0.75021 (15)0.7982 (5)0.0374 (8)
H3W0.06600.73420.86390.056*
H4W0.11760.79270.77040.056*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Mg10.0191 (6)0.0134 (4)0.0184 (5)0.0004 (4)0.0009 (4)0.0004 (4)
O10.0186 (13)0.0310 (13)0.0202 (12)0.0004 (10)0.0019 (11)0.0074 (10)
O20.0247 (16)0.0462 (17)0.0253 (14)0.0133 (12)0.0075 (12)0.0005 (12)
O30.0274 (14)0.0165 (11)0.0235 (12)0.0008 (10)0.0074 (11)0.0006 (9)
O40.0281 (15)0.0195 (12)0.0203 (13)0.0067 (10)0.0045 (11)0.0014 (9)
N10.0215 (16)0.0167 (13)0.0265 (15)0.0018 (11)0.0058 (12)0.0039 (11)
N30.0147 (16)0.0249 (14)0.0400 (19)0.0032 (12)0.0009 (14)0.0065 (13)
C10.0195 (17)0.0151 (13)0.0175 (16)0.0016 (12)0.0043 (14)0.0002 (11)
C20.0197 (18)0.0150 (14)0.0192 (16)0.0024 (12)0.0008 (14)0.0015 (12)
C30.0184 (18)0.0204 (16)0.0274 (19)0.0040 (13)0.0011 (15)0.0023 (13)
C40.0151 (19)0.0216 (16)0.0244 (18)0.0023 (12)0.0011 (14)0.0045 (13)
C50.0191 (17)0.0160 (14)0.0203 (16)0.0019 (12)0.0035 (14)0.0016 (12)
C60.0129 (16)0.0198 (15)0.0224 (17)0.0022 (11)0.0018 (14)0.0008 (12)
C70.0151 (16)0.0178 (14)0.0134 (14)0.0002 (12)0.0027 (13)0.0002 (11)
C80.0154 (17)0.0154 (14)0.0204 (17)0.0024 (11)0.0007 (14)0.0011 (11)
C90.024 (2)0.0208 (16)0.034 (2)0.0068 (14)0.0050 (17)0.0067 (14)
O1W0.0340 (15)0.0271 (13)0.0225 (12)0.0071 (11)0.0043 (12)0.0052 (10)
O2W0.0486 (19)0.0219 (12)0.0476 (19)0.0063 (12)0.0251 (16)0.0022 (12)
Geometric parameters (Å, º) top
Mg1—N12.195 (3)C1—C21.514 (4)
Mg1—O1i2.051 (3)C2—C31.384 (5)
Mg1—O3i2.106 (3)C2—C71.416 (5)
Mg1—O4ii2.113 (3)C3—C41.395 (5)
Mg1—O1W2.063 (3)C3—H20.9300
Mg1—O2W2.074 (3)C4—C51.395 (5)
O1—C81.259 (4)C5—C61.388 (5)
O2—C81.241 (4)C6—C71.380 (5)
O3—C11.263 (4)C6—H10.9300
O4—C11.257 (4)C7—C81.499 (5)
N1—C91.310 (5)C9—H90.9300
N1—C51.384 (4)O1W—H1W0.8401
N3—C91.345 (5)O1W—H2W0.8400
N3—C41.383 (5)O2W—H3W0.8399
N3—H30.8600O2W—H4W0.8400
O1i—Mg1—O1W81.69 (12)C7—C2—C1120.7 (3)
O1i—Mg1—O2W174.71 (15)C2—C3—C4117.5 (3)
O1W—Mg1—O2W93.18 (14)C2—C3—H2121.2
O1i—Mg1—O3i85.34 (12)C4—C3—H2121.3
O1W—Mg1—O3i166.51 (13)N3—C4—C3133.6 (3)
O2W—Mg1—O3i99.68 (13)N3—C4—C5104.4 (3)
O1i—Mg1—O4ii95.02 (12)C3—C4—C5122.0 (3)
O1W—Mg1—O4ii90.61 (11)N1—C5—C6129.5 (3)
O2W—Mg1—O4ii83.68 (12)N1—C5—C4110.1 (3)
O3i—Mg1—O4ii86.80 (11)C6—C5—C4120.3 (3)
O1i—Mg1—N198.87 (12)C7—C6—C5118.2 (3)
O1W—Mg1—N197.00 (12)C7—C6—H1120.9
O2W—Mg1—N182.98 (13)C5—C6—H1120.9
O3i—Mg1—N188.65 (12)C6—C7—C2121.4 (3)
O4ii—Mg1—N1164.98 (12)C6—C7—C8115.4 (3)
C8—O1—Mg1iii126.4 (2)C2—C7—C8123.2 (3)
C1—O3—Mg1iii139.4 (2)O2—C8—O1123.3 (3)
C1—O4—Mg1iv130.8 (2)O2—C8—C7117.5 (3)
C9—N1—C5104.8 (3)O1—C8—C7119.0 (3)
C9—N1—Mg1125.8 (2)N1—C9—N3113.2 (3)
C5—N1—Mg1127.6 (3)N1—C9—H9123.4
C9—N3—C4107.4 (3)N3—C9—H9123.4
C9—N3—H3126.3Mg1—O1W—H1W133.0
C4—N3—H3126.3Mg1—O1W—H2W97.9
O4—C1—O3123.8 (3)H1W—O1W—H2W111.1
O4—C1—C2117.6 (3)Mg1—O2W—H3W124.6
O3—C1—C2118.6 (3)Mg1—O2W—H4W119.1
C3—C2—C7120.4 (3)H3W—O2W—H4W111.8
C3—C2—C1118.9 (3)
Symmetry codes: (i) x, y+1, z1/2; (ii) x+1/2, y+1/2, z; (iii) x, y+1, z+1/2; (iv) x1/2, y1/2, z.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N3—H3···O1v0.862.292.992 (4)138
O1W—H1W···O2iii0.841.842.651 (4)163
O1W—H2W···O3ii0.841.922.734 (4)164
O2W—H3W···O4iii0.842.273.068 (4)160
O2W—H4W···O2vi0.841.872.685 (4)164
Symmetry codes: (ii) x+1/2, y+1/2, z; (iii) x, y+1, z+1/2; (v) x1, y+1, z1/2; (vi) x1/2, y+1/2, z.

Experimental details

Crystal data
Chemical formula[Mg(C9H4N2O4)(H2O)2]
Mr264.48
Crystal system, space groupMonoclinic, Cc
Temperature (K)293
a, b, c (Å)7.4793 (15), 18.958 (4), 7.3132 (15)
β (°) 99.38 (3)
V3)1023.1 (4)
Z4
Radiation typeMo Kα
µ (mm1)0.20
Crystal size (mm)0.30 × 0.25 × 0.21
Data collection
DiffractometerRigaku/MSC Mercury CCD
Absorption correctionMulti-scan
(REQAB; Jacobson, 1998)
Tmin, Tmax0.943, 0.960
No. of measured, independent and
observed [I > 2σ(I)] reflections
4611, 1143, 1096
Rint0.031
(sin θ/λ)max1)0.649
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.036, 0.090, 1.06
No. of reflections1143
No. of parameters163
No. of restraints2
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)0.38, 0.25

Computer programs: CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEPII (Johnson, 1976) and DIAMOND (Brandenburg, 1999).

Selected bond lengths (Å) top
Mg1—N12.195 (3)Mg1—O4ii2.113 (3)
Mg1—O1i2.051 (3)Mg1—O1W2.063 (3)
Mg1—O3i2.106 (3)Mg1—O2W2.074 (3)
Symmetry codes: (i) x, y+1, z1/2; (ii) x+1/2, y+1/2, z.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N3—H3···O1iii0.862.292.992 (4)138.4
O1W—H1W···O2iv0.841.842.651 (4)162.7
O1W—H2W···O3ii0.841.922.734 (4)164.2
O2W—H3W···O4iv0.842.273.068 (4)159.9
O2W—H4W···O2v0.841.872.685 (4)164.2
Symmetry codes: (ii) x+1/2, y+1/2, z; (iii) x1, y+1, z1/2; (iv) x, y+1, z+1/2; (v) x1/2, y+1/2, z.
 

Acknowledgements

The authors acknowledge Guang Dong Ocean University for supporting this work.

References

First citationBrandenburg, K. (1999). DIAMOND. Crystal Impact GbR, Bonn, Germany.  Google Scholar
First citationJacobson, R. (1998). REQAB. Private communication to Molecular Structure Corporation, The Woodlands, Texas, USA.  Google Scholar
First citationJohnson, C. K. (1976). ORTEPII. Report ORNL-5138. Oak Ridge National Laboratory, Tennessee, USA.  Google Scholar
First citationRigaku/MSC (2002). CrystalStructure. Rigaku/MSC, The Woodlands, Texas, USA.  Google Scholar
First citationSheldrick, G. M. (2008). Acta Cryst. A64, 112–122.  Web of Science CrossRef CAS IUCr Journals Google Scholar
First citationSong, W.-D., Wang, H., Hu, S.-W., Qin, P.-W. & Li, S.-J. (2009). Acta Cryst. E65, m701.  Web of Science CSD CrossRef IUCr Journals Google Scholar
First citationSong, W.-D., Wang, H., Li, S.-J., Qin, P.-W. & Hu, S.-W. (2009). Acta Cryst. E65, m702.  Web of Science CSD CrossRef IUCr Journals Google Scholar
First citationSong, W.-D., Wang, H., Qin, P.-W., Li, S.-J. & Hu, S.-W. (2009). Acta Cryst. E65, m672.  Web of Science CSD CrossRef IUCr Journals Google Scholar
First citationWang, H., Song, W.-D., Li, S.-J., Miao, D.-L. & Liu, J. (2009). Acta Cryst. E65, m1423.  Web of Science CrossRef IUCr Journals Google Scholar

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