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

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 68| Part 5| May 2012| Pages m679-m680

Poly[di-μ9-citrato-cobalt(II)tetra­sodium]

aDepartment of Materials and Chemical Engineering, Ministry of Education Key Laboratory of Advanced Materials of Tropical Island Resources, Hainan University, Haikou 570228, Hainan Province, People's Republic of China
*Correspondence e-mail: fuxiang.wang@yahoo.com.cn

(Received 30 March 2012; accepted 20 April 2012; online 25 April 2012)

The title compound, [CoNa4(C6H5O7)2]n, was obtained under hydro­thermal conditions as a minor product. The Co2+ cation is located on a crystallographic inversion center and is coordinated by six O atoms from two different citrate units, forming a [Co(C6H5O7)2]4− building unit with Co—O bond lengths between 2.0578 (17) and 2.0813 (16) Å. The structure features two crystallographically independent Na+ ions. The first Na+ cation is five-coordinated by O atoms of five carboxylate groups from four different citrate anions. The second Na+ cation is surrounded by six O atoms of five carboxylate groups from five different citrate anions. The carboxylate groups of the citrate are completely depronona­ted, the hydroxyl group, however, is not. It is coordinated to the Co2+ cation, and through an O—H⋯O hydrogen bond connected to a neighboring [Co(C6H5O7)2]4− building unit. The coordination modes of the carboxyl­ate O atoms vary, with one O atom being coordinated to three different Na+ cations, three are bridging O atoms bound to two Na+ cations and two are connected to a Co2+ cation and a Na+ cation, respectively. Through these inter­connections, the basic [Co(C6H5O7)2]4− building units are linked with each other through coordination of their carboxyl­ate groups to the Na+ cations, forming a three-dimensional framework.

Related literature

For potential applications of coordination polymers in drug delivery, shape-selective sorption/separation and catalysis, see: Chen & Tong (2007[Chen, X.-M. & Tong, M.-L. (2007). Acc. Chem. Res. 40, 162-170.]); Zeng et al. (2009[Zeng, T.-F., Hu, X. & Bu, X.-H. (2009). Chem. Soc. Rev. 38, 469-480.]). Their structures vary from one-dimensional to three-dimensional architectures, see: Du & Bu et al. (2009[Du, M. & Bu, X.-H. (2009). Bull. Chem. Soc. Jpn, 80, 539-554.]); Qiu & Zhu (2009[Qiu, S.-L. & Zhu, G.-S. (2009). Coord. Chem. Rev. 253, 2891-2911.]). For a compound containing the [Co(C6H5O7)2]4− subunit, see: Matzapetakis et al. (2000[Matzapetakis, M., Dakanali, M. & Salifoglou, A. (2000). J. Biol. Inorg. Chem. 5, 469-474.]); for coordination polymers involving Na+ cations, see: Pan et al. (2011[Pan, Q. H., Cheng, Q. & Hu, T.-L. (2011). Chem. J. Chin. Univ. 32, 527-531.]).

[Scheme 1]

Experimental

Crystal data
  • [CoNa4(C6H5O7)2]

  • Mr = 529.09

  • Monoclinic, P 21 /c

  • a = 7.9792 (16) Å

  • b = 12.516 (3) Å

  • c = 8.7110 (17) Å

  • β = 113.84 (3)°

  • V = 795.7 (3) Å3

  • Z = 2

  • Mo Kα radiation

  • μ = 1.28 mm−1

  • T = 293 K

  • 0.25 × 0.15 × 0.15 mm

Data collection
  • Rigaku R-AXIS RAPID-S diffractometer

  • Absorption correction: multi-scan (CrystalClear; Rigaku/MSC, 2002[Rigaku/MSC (2002). CrystalStructure. Rigaku/MSC Inc., The Woodlands, Texas, USA.]) Tmin = 0.795, Tmax = 0.826

  • 8179 measured reflections

  • 1820 independent reflections

  • 1493 reflections with I > 2σ(I)

  • Rint = 0.055

Refinement
  • R[F2 > 2σ(F2)] = 0.041

  • wR(F2) = 0.072

  • S = 1.12

  • 1820 reflections

  • 142 parameters

  • H-atom parameters constrained

  • Δρmax = 0.29 e Å−3

  • Δρmin = −0.31 e Å−3

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
O1—H1⋯O4i 0.85 1.79 2.640 (3) 174
Symmetry code: (i) -x+2, -y, -z+1.

Data collection: RAPID-AUTO (Rigaku, 1998[Rigaku (1998). RAPID-AUTO. Rigaku Corporation, Tokyo, Japan.]); cell refinement: RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2002[Rigaku/MSC (2002). CrystalStructure. Rigaku/MSC Inc., The Woodlands, Texas, USA.]); 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: SHELXTL (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]); software used to prepare material for publication: SHELXTL.

Supporting information


Comment top

The design and synthesis of coordination polymers have attracted increasing attention in recent years because of their potential applications in drug delivery, shape-selective sorption/separation, and catalysis (Chen et al., 2007, Zeng et al., 2009). Architectures of coordination polymers described vary between one-dimensional and three-dimensional (Qiu et al., 2009, Du et al., 2009). Citric acid and its anions have been widely used as ligands for the construction of coordination polymers, because of their versatility and ability to bind metals with diverse connection modes. In this paper, we present a new three-dimensional coordination polymer [Na4Co(C6H5O7)2]n with citric acid as the ligand.

As shown in Fig. 1, the asymmetric unit of the crystal structure of the title compound consists of half a Co2+ center, two Na+ cations, and a citrate anion. The Co2+ center, located on a crystallographic inversion center, is coordinated by six O atoms from two different citrate units with the Co—O bond distances in the range of 2.0578 (17) to 2.0812 (16) Å, resulting in a slightly distorted octahedral coordination geometry. For the citrate unit, all the carboxylic acid groups are completely deprononated, however the hydroxyl group is not. Three O atoms of each citrate unit are bonded to the Co2+ center, one of which is the hydroxy O atom of the citric acid, the other two are from two different carboxylate groups of the citrate ligands. In such a way, two citrate anions and one Co2+ cation form a [Co(C6H5O7)2]4- building unit such as described previously by Matzapetakis et al. (2000). The citrate anions also coordinate to the Na+ cations. Oxygen atom O1 of the hydroxyl group is connected only to the Co cation. Carboxylate oxygen atom O5 is linked to three different Na cations. The other five O atoms are bridging O atoms bound to two Na cations (O3, O4, and O7 atoms) or a Co cation and a Na cation (O2 and O6 atoms), respectively. The two Na+ cations display different coordination modes by the O atoms. The Na1+ cation is five-coordinated by five O atoms of five carboxylic acid groups from four different citrate units. The Na2+ cation, on the other hand, is surrounded by six O atoms of five carboxylic acid groups from five different citrate units. The Na—O bond distances are in the range of 2.286 (2)–2.562 (2) Å, which is in the usual range expected for such a compound (see for example: Pan et al., 2011). In this way, the [Co(C6H5O7)2]4- building units are linked with each other through coordination of their carboxylate groups to the Na+ cations to form a three-dimensional framework (see Fig. 2).

As shown in Fig. 3, the [Co(C6H5O7)2]4- building units are arranged in layers with the Co2+ centers located within the bc plane (Co atoms are placed on crystallographic inversion centers at the corners of the unit cell and at the center of the bc plane of the unit cell). Neighboring [Co(C6H5O7)2]4- building units are further linked along the c axis to form a one-dimesional chain, and by the O—H···O hydrogen bonds formed by the hydroxyl group and the O4 atom of a neighboring building unit (symmetry code: -x+2, -y, -z+1). The Na+ cations are located between adjacent planes of the cobalt building units, and are coordinated by the carboxylate groups of citrate ligands. In such a way a sheet dominated by Na—O ionic interactions is formed, as shown in Fig. 4. The sheets are arranged parallel to those of the Co(C6H5O7)2]4- building units perpendicular to the a axis, and are supported by the [Co(C6H5O7)2]4- building units to construct the three-dimensional coordination polymer.

Related literature top

For potential applications of coordination polymers in drug delivery, shape-selective sorption/separation and catalysis, see: Chen & Tong (2007); Zeng et al. (2009). Their structures vary from one-dimensional to three-dimensional architectures, see: Du & Bu et al. (2009); Qiu & Zhu (2009). For a compound containing the [Co(C6H5O7)2]4- subunit, see: Matzapetakis et al. (2000); for coordination polymers involving Na+ cations, see: Pan et al. (2011).

Experimental top

In a typical synthesis, a mixture of Co(OAc)2.4H2O (0.08 g), benzene-1,4-dicarboxylic acid (0.042 g), NaOH (0.012 g), citric acid (0.096 g), H2O (3 ml) and ethanol (7 ml) was added to a 20 ml Teflon-lined stainless steel autoclave and heated at 433 K (160 °C) for 3 days. Yellow block shaped crystals were obtained. yield: ~15% (based on NaOH).

Refinement top

All H atoms were positioned geometrically (C—H = 0.97 Å and O—H = 0.85 Å) and allowed to ride on their parent atoms, with Uiso(H) = 1.2Ueq(parent atom).

Computing details top

Data collection: RAPID-AUTO (Rigaku, 1998); cell refinement: RAPID-AUTO (Rigaku, 1998); 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: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. A view of the asymmetric unit of complex. Ellipsoids are drawn at the 30% probability level. [Symmetry code: (i) 2-x, -y, 2-z.]
[Figure 2] Fig. 2. A view of the packing along the a axis. Dashed lines indicate hydrogen bonds.
[Figure 3] Fig. 3. A view of the arrangement of the [Co(C6H5O7)2]4- building units along the bc palne. Dashed lines indicate hydrogen bonds. Sodium atoms are omitted in this view for clarity.
[Figure 4] Fig. 4. A view of Na—O sheet along the bc plane. Co, C and H atoms are omitted in this view for clarity.
Poly[di-µ9-citrato-cobalt(II)tetrasodium] top
Crystal data top
[CoNa4(C6H5O7)2]F(000) = 530
Mr = 529.09Dx = 2.208 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 7365 reflections
a = 7.9792 (16) Åθ = 3.0–27.5°
b = 12.516 (3) ŵ = 1.28 mm1
c = 8.7110 (17) ÅT = 293 K
β = 113.84 (3)°Block, yellow
V = 795.7 (3) Å30.25 × 0.15 × 0.15 mm
Z = 2
Data collection top
Rigaku R-AXIS RAPID-S
diffractometer
1820 independent reflections
Radiation source: fine-focus sealed tube1493 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.055
ω scansθmax = 27.5°, θmin = 3.0°
Absorption correction: multi-scan
(CrystalClear; Rigaku/MSC, 2002)
h = 1010
Tmin = 0.795, Tmax = 0.826k = 1516
8179 measured reflectionsl = 1111
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)] = 0.041Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.072H-atom parameters constrained
S = 1.12 w = 1/[σ2(Fo2) + (0.0253P)2 + 0.3552P]
where P = (Fo2 + 2Fc2)/3
1820 reflections(Δ/σ)max < 0.001
142 parametersΔρmax = 0.29 e Å3
0 restraintsΔρmin = 0.31 e Å3
Crystal data top
[CoNa4(C6H5O7)2]V = 795.7 (3) Å3
Mr = 529.09Z = 2
Monoclinic, P21/cMo Kα radiation
a = 7.9792 (16) ŵ = 1.28 mm1
b = 12.516 (3) ÅT = 293 K
c = 8.7110 (17) Å0.25 × 0.15 × 0.15 mm
β = 113.84 (3)°
Data collection top
Rigaku R-AXIS RAPID-S
diffractometer
1820 independent reflections
Absorption correction: multi-scan
(CrystalClear; Rigaku/MSC, 2002)
1493 reflections with I > 2σ(I)
Tmin = 0.795, Tmax = 0.826Rint = 0.055
8179 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0410 restraints
wR(F2) = 0.072H-atom parameters constrained
S = 1.12Δρmax = 0.29 e Å3
1820 reflectionsΔρmin = 0.31 e Å3
142 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
xyzUiso*/Ueq
Co11.00000.00001.00000.01112 (13)
Na10.60461 (14)0.11777 (8)1.03513 (13)0.0233 (3)
Na20.44536 (14)0.37904 (8)0.83883 (13)0.0219 (3)
O11.0085 (2)0.01241 (12)0.7650 (2)0.0125 (4)
H10.90890.00010.68070.015*
O20.8226 (2)0.12772 (13)0.9279 (2)0.0177 (4)
O30.6796 (2)0.27068 (15)0.7861 (2)0.0232 (5)
O41.3026 (2)0.01125 (14)0.5009 (2)0.0195 (4)
O51.4004 (2)0.01690 (13)0.7789 (2)0.0186 (4)
O61.2231 (2)0.10114 (14)1.0518 (2)0.0172 (4)
O71.3273 (2)0.22348 (13)0.9263 (2)0.0187 (4)
C11.0686 (3)0.12024 (19)0.7524 (3)0.0120 (5)
C20.9109 (3)0.19974 (19)0.7122 (3)0.0138 (5)
H2A0.96160.27090.71930.017*
H2B0.82740.18860.59610.017*
C30.7974 (3)0.1990 (2)0.8171 (3)0.0143 (5)
C41.1394 (3)0.12288 (19)0.6139 (3)0.0144 (5)
H4A1.03770.10870.50750.017*
H4B1.18330.19440.60820.017*
C51.2912 (3)0.0446 (2)0.6347 (3)0.0142 (5)
C61.2209 (3)0.1507 (2)0.9229 (3)0.0132 (5)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Co10.0127 (2)0.0116 (2)0.0100 (2)0.0002 (2)0.00553 (18)0.0019 (2)
Na10.0213 (6)0.0273 (6)0.0241 (6)0.0021 (5)0.0121 (5)0.0007 (5)
Na20.0197 (5)0.0251 (6)0.0217 (6)0.0023 (5)0.0092 (5)0.0015 (5)
O10.0139 (8)0.0118 (9)0.0109 (8)0.0036 (7)0.0041 (7)0.0007 (7)
O20.0205 (10)0.0181 (10)0.0184 (10)0.0034 (8)0.0121 (8)0.0051 (8)
O30.0212 (11)0.0269 (11)0.0246 (11)0.0126 (8)0.0126 (9)0.0074 (9)
O40.0186 (10)0.0256 (10)0.0163 (9)0.0018 (8)0.0092 (8)0.0050 (8)
O50.0190 (9)0.0187 (10)0.0152 (9)0.0030 (8)0.0039 (8)0.0003 (8)
O60.0176 (9)0.0199 (10)0.0113 (9)0.0018 (8)0.0028 (7)0.0032 (8)
O70.0179 (10)0.0176 (9)0.0219 (10)0.0051 (8)0.0096 (8)0.0022 (8)
C10.0144 (12)0.0112 (12)0.0118 (12)0.0005 (10)0.0069 (10)0.0026 (10)
C20.0167 (13)0.0145 (12)0.0111 (12)0.0030 (10)0.0066 (10)0.0015 (11)
C30.0137 (13)0.0150 (13)0.0128 (13)0.0000 (10)0.0038 (10)0.0023 (11)
C40.0167 (13)0.0151 (13)0.0125 (13)0.0032 (10)0.0072 (11)0.0015 (11)
C50.0139 (13)0.0135 (12)0.0160 (14)0.0039 (10)0.0068 (11)0.0002 (11)
C60.0112 (12)0.0141 (12)0.0164 (13)0.0042 (10)0.0077 (11)0.0021 (11)
Geometric parameters (Å, º) top
Co1—O2i2.0578 (17)O4—C51.275 (3)
Co1—O22.0578 (17)O4—Na2viii2.542 (2)
Co1—O62.0800 (17)O4—Na2ix2.545 (2)
Co1—O6i2.0800 (17)O5—C51.254 (3)
Co1—O12.0813 (16)O5—Na1i2.349 (2)
Co1—O1i2.0813 (16)O5—Na1x2.508 (2)
Na1—O22.286 (2)O5—Na2viii2.562 (2)
Na1—O5i2.349 (2)O6—C61.276 (3)
Na1—O7ii2.418 (2)O6—Na2xi2.424 (2)
Na1—O3iii2.455 (2)O7—C61.238 (3)
Na1—O5ii2.508 (2)O7—Na2x2.416 (2)
Na2—O7ii2.416 (2)O7—Na1x2.418 (2)
Na2—O6iv2.424 (2)C1—C41.526 (3)
Na2—O32.498 (2)C1—C21.530 (3)
Na2—O4v2.542 (2)C1—C61.539 (3)
Na2—O4vi2.545 (2)C2—C31.525 (3)
Na2—O5v2.562 (2)C2—H2A0.9700
O1—C11.451 (3)C2—H2B0.9700
O1—H10.8501C4—C51.510 (3)
O2—C31.270 (3)C4—H4A0.9700
O3—C31.247 (3)C4—H4B0.9700
O3—Na1vii2.455 (2)
O2i—Co1—O2180.000 (1)C3—O3—Na1vii119.56 (16)
O2i—Co1—O689.06 (7)C3—O3—Na2154.82 (17)
O2—Co1—O690.94 (7)Na1vii—O3—Na285.63 (7)
O2i—Co1—O6i90.94 (7)C5—O4—Na2viii92.53 (15)
O2—Co1—O6i89.06 (7)C5—O4—Na2ix122.91 (16)
O6—Co1—O6i180.0Na2viii—O4—Na2ix102.91 (7)
O2i—Co1—O193.79 (7)C5—O5—Na1i133.69 (16)
O2—Co1—O186.21 (7)C5—O5—Na1x133.68 (16)
O6—Co1—O178.61 (7)Na1i—O5—Na1x86.18 (7)
O6i—Co1—O1101.39 (7)C5—O5—Na2viii92.13 (15)
O2i—Co1—O1i86.21 (7)Na1i—O5—Na2viii86.42 (6)
O2—Co1—O1i93.79 (7)Na1x—O5—Na2viii116.79 (8)
O6—Co1—O1i101.39 (7)C6—O6—Co1113.50 (16)
O6i—Co1—O1i78.61 (7)C6—O6—Na2xi127.01 (16)
O1—Co1—O1i180.000 (1)Co1—O6—Na2xi119.41 (8)
O2—Na1—O5i123.27 (8)C6—O7—Na2x159.49 (17)
O2—Na1—O7ii122.46 (7)C6—O7—Na1x96.72 (15)
O5i—Na1—O7ii113.26 (7)Na2x—O7—Na1x98.80 (7)
O2—Na1—O3iii112.38 (8)O1—C1—C4108.62 (19)
O5i—Na1—O3iii81.95 (7)O1—C1—C2110.85 (19)
O7ii—Na1—O3iii83.86 (7)C4—C1—C2109.76 (19)
O2—Na1—O5ii89.53 (7)O1—C1—C6108.27 (19)
O5i—Na1—O5ii93.82 (7)C4—C1—C6110.9 (2)
O7ii—Na1—O5ii76.36 (7)C2—C1—C6108.40 (19)
O3iii—Na1—O5ii156.27 (7)C3—C2—C1119.5 (2)
O7ii—Na2—O6iv101.07 (7)C3—C2—H2A107.5
O7ii—Na2—O392.10 (7)C1—C2—H2A107.5
O6iv—Na2—O398.95 (7)C3—C2—H2B107.5
O7ii—Na2—O4v132.38 (7)C1—C2—H2B107.5
O6iv—Na2—O4v125.90 (7)H2A—C2—H2B107.0
O3—Na2—O4v88.26 (7)O3—C3—O2123.0 (2)
O7ii—Na2—O4vi86.60 (7)O3—C3—C2116.4 (2)
O6iv—Na2—O4vi102.26 (7)O2—C3—C2120.6 (2)
O3—Na2—O4vi158.61 (8)C5—C4—C1115.2 (2)
O4v—Na2—O4vi77.09 (7)C5—C4—H4A108.5
O7ii—Na2—O5v168.65 (7)C1—C4—H4A108.5
O6iv—Na2—O5v77.74 (7)C5—C4—H4B108.5
O3—Na2—O5v77.04 (7)C1—C4—H4B108.5
O4v—Na2—O5v51.67 (6)H4A—C4—H4B107.5
O4vi—Na2—O5v104.71 (7)O5—C5—O4123.2 (2)
C1—O1—Co1106.67 (13)O5—C5—C4119.9 (2)
C1—O1—H1109.0O4—C5—C4116.9 (2)
Co1—O1—H1116.4O7—C6—O6124.8 (2)
C3—O2—Co1131.01 (16)O7—C6—C1118.2 (2)
C3—O2—Na1115.84 (16)O6—C6—C1117.0 (2)
Co1—O2—Na1112.10 (8)
Symmetry codes: (i) x+2, y, z+2; (ii) x1, y, z; (iii) x, y+1/2, z+1/2; (iv) x1, y+1/2, z1/2; (v) x+2, y+1/2, z+3/2; (vi) x1, y+1/2, z+1/2; (vii) x, y+1/2, z1/2; (viii) x+2, y1/2, z+3/2; (ix) x+1, y+1/2, z1/2; (x) x+1, y, z; (xi) x+1, y+1/2, z+1/2.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O1—H1···O4xii0.851.792.640 (3)174
Symmetry code: (xii) x+2, y, z+1.

Experimental details

Crystal data
Chemical formula[CoNa4(C6H5O7)2]
Mr529.09
Crystal system, space groupMonoclinic, P21/c
Temperature (K)293
a, b, c (Å)7.9792 (16), 12.516 (3), 8.7110 (17)
β (°) 113.84 (3)
V3)795.7 (3)
Z2
Radiation typeMo Kα
µ (mm1)1.28
Crystal size (mm)0.25 × 0.15 × 0.15
Data collection
DiffractometerRigaku R-AXIS RAPID-S
diffractometer
Absorption correctionMulti-scan
(CrystalClear; Rigaku/MSC, 2002)
Tmin, Tmax0.795, 0.826
No. of measured, independent and
observed [I > 2σ(I)] reflections
8179, 1820, 1493
Rint0.055
(sin θ/λ)max1)0.649
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.041, 0.072, 1.12
No. of reflections1820
No. of parameters142
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)0.29, 0.31

Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O1—H1···O4i0.851.792.640 (3)174.1
Symmetry code: (i) x+2, y, z+1.
 

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21101047), the Natural Science Foundation of Hainan Province (No. 211010) and the Priming Scientific Research Foundation of Hainan University (No. kyqd1112).

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Volume 68| Part 5| May 2012| Pages m679-m680
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