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

Journal logoCRYSTALLOGRAPHIC
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ISSN: 2056-9890
Volume 71| Part 4| April 2015| Pages m91-m92

Crystal structure of catena-poly[[di­aqua­cadmium(II)]-μ-3,3′-(1,3-phenyl­ene)diacrylato]

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aKey Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, People's Republic of China
*Correspondence e-mail: kunlin@jlu.edu.cn

Edited by D.-J. Xu, Zhejiang University (Yuquan Campus), China (Received 28 February 2015; accepted 16 March 2015; online 21 March 2015)

In the crystal of the title polymeric complex, [Cd(C12H8O4)(H2O)2]n, the CdII cation, located on a twofold rotation axis, is coordinated by two water mol­ecules and chelated by two phenyl­enediacrylate anions (mpda) in a distorted octa­hedral geometry. The mpda anions bridge the CdII cations, forming helical chains propagating along the c-axis direction. The mpba anion has twofold symmetry with two benzene C atoms located on the twofold rotation axis. In the crystal, O—H⋯O hydrogen bonds link the polymeric helical chains into a three-dimensional supra­molecular architecture.

1. Related literature

For V-shaped metal complexes coordinated by the phenyl­enediacrylate anion, see: Liu et al. (2013[Liu, D., Li, N.-Y., Deng, F.-Z., Wang, Y.-F., Xu, Y., Xie, G.-Y. & Zheng, Z.-L. (2013). J. Mol. Struct. 1034, 271-275.]). For related metal-organic coordination polymers with an m-phenyl­enedi­carboxyl­ate ligand, see: Yang et al. (2014[Yang, S.-Y., Deng, X.-L., Jin, R.-F., Naumov, P., Panda, M. K., Huang, R.-B., Zheng, L.-S. & Teo, B. K. (2014). J. Am. Chem. Soc. 136, 558-561.]).

[Scheme 1]

2. Experimental

2.1. Crystal data

  • [Cd(C12H8O4)(H2O)2]

  • Mr = 364.62

  • Orthorhombic, C 2221

  • a = 5.3145 (12) Å

  • b = 11.991 (3) Å

  • c = 19.767 (5) Å

  • V = 1259.7 (5) Å3

  • Z = 4

  • Mo Kα radiation

  • μ = 1.75 mm−1

  • T = 293 K

  • 0.35 × 0.32 × 0.25 mm

2.2. Data collection

  • Bruker SMART APEXII CCD diffractometer

  • Absorption correction: multi-scan (SADABS; Bruker, 2008[Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]) Tmin = 0.59, Tmax = 0.68

  • 3205 measured reflections

  • 1107 independent reflections

  • 950 reflections with I > 2σ(I)

  • Rint = 0.036

2.3. Refinement

  • R[F2 > 2σ(F2)] = 0.039

  • wR(F2) = 0.155

  • S = 1.08

  • 1107 reflections

  • 96 parameters

  • 2 restraints

  • H atoms treated by a mixture of independent and constrained refinement

  • Δρmax = 0.93 e Å−3

  • Δρmin = −0.64 e Å−3

  • Absolute structure: Flack (1983[Flack, H. D. (1983). Acta Cryst. A39, 876-881.]), 1035 Friedel pairs

  • Absolute structure parameter: 0.07 (19)

Table 1
Selected bond lengths (Å)

Cd1—O1 2.329 (6)
Cd1—O2 2.380 (6)
Cd1—O3W 2.199 (7)

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
O3W—H1A⋯O1i 0.85 (2) 1.88 (4) 2.695 (9) 160 (8)
O3W—H1B⋯O2ii 0.84 (2) 1.92 (3) 2.736 (8) 162 (8)
Symmetry codes: (i) x-1, -y+2, -z+2; (ii) [x-{\script{1\over 2}}, -y+{\script{3\over 2}}, -z+2].

Data collection: APEX2 (Bruker, 2008[Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); cell refinement: SAINT (Bruker, 2008[Bruker (2008). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.]); data reduction: SAINT; 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: DIAMOND (Brandenburg, 2008[Brandenburg, K. (2008). DIAMOND. Crystal Impact GbR, Bonn, Germany.])); software used to prepare material for publication: PLATON (Spek, 2009[Spek, A. L. (2009). Acta Cryst. D65, 148-155.]).

Supporting information


Introduction top

In crystal engineering, a great inter­est is focused on the supra­molecular self-assembly of helical or chiral coordination polymers from appropriately bridging ligands and metallic tectons through either coordinate bonds and hydrogen bonds. Although much effort has been devoted to the assembly of helical or chiral coordination polymers based on chiral or achiral ligands, the design and construction of chiral coordination polymer based on helical topology is still a great challenge for chemists.

Experimental top

All reagents and solvents employed were commercially available and were used as received without further purification.

Synthesis and crystallization top

A mixture of Cd(NO3)2·4H2O (62 mg, 0.25 mmol), m-phenyl­enediacrylic acid (H2mpda, 44 mg, 0.2 mmol) and H2O (10 mL) was sealed in a 25 mL stainless steel reactor with a Teflon liner, heated to 413 K for 3 d and then cooled to room temperature. The crystals were washed with methanol to give the title complex in about 35% yield (based on the H2mpda ligand).

Refinement top

All non-hydrogen atoms are easily found from the different Fourier maps and refined anisotropically. All H atoms of H2O molecules are found in the difference Fourier map. The C-bound H atoms of aromatic rings were refined using a riding model [0.93 Å (CH) and Uiso(H) = 1.2Ueq(C)].

Results and discussion top

The m-phenyl­enediacrylate (mpda) has various conformations for the rotation of carbon-carbon bonds, such as the C—C single bonds between aromatic rings and C=C bonds. The V-shaped mpda coordinated with metal ions have been documented (Liu et al., 2013). But the mpda has not been well exploited in constructing metal-organic coordination polymers in comparison with the m-phenyl­enedi­carboxyl­ate ligand (Yang et al., 2014). Herein, we report a poly[(m-phenyl­enediacrylate)(water)cadmium] with the formulae [Cd(mpda)(H2O)2]n (1). The title compound crystallizes in the chiral C222 (1) space group, and contains a homochiral left-handed single-stranded helical chain.

In the structure of 1 (Fig. 1), the Cd2+ centre adopts a six-coordinated mode with a distorted o­cta­hedral geometry (CdO6) via binding to two water O atoms and four O atoms from two different CO2- groups of mpda ligands [O1, O2, O1i, O2i; symmetry code: (i) x,-y+2,-z+2]. The Cd—O distances range from 2.199 (7) to 2.380 (6) Å. Taking account of the O3W—Cd1—O3Wi angle of 92.1 (4)°, the coordination mode of Cd2+ ion may play an determining role in the formation of the Cd1i···Cd1···Cd1i angle of 85.65°. Each mpda ligand with a monodentate mode bridges two different Cd2+ ions, via carboxyl­ate groups at each end of the ligand molecule. Of the structure of the mpda, two acrylate groups (CH=CH-COO-) are located at the benzene ring in a trans-position fashion. The dihedral angles of the CH=CH-COO- and C6H4—CH=CH group are ca.11.4° and 7.9°, respectively, while that of C1···C7···C6···C1i is 180°. These dihedral angle data indicate that the mpda ligand is nearly coplanar and there exist intra­molecular π-π electronic conjugations.

The mpda ligands serve as V-shaped bridges to link the metal ions into infinite helical coordination chains running along the c-axis, with the Cd···Cd distance separated by mpda being 14.54 Å. The helical pitch of 19.767 (5) Å is equal to the c dimension of the unit cell. There has the one and only left-handed single-stranded chain in 1, which reveals that this work presents a new unusual example of homochiral architecture based on the helical topology. In 1, the packing of the helical chains is sustained by complicated hydrogen bonds and ππ stacking involving all the coordinated water molecules, and the C=C double bonds and phenyl­ene rings of the mpda ligands. Each phenyl­ene ring from one chain inter­acts with a C=C double bond from another chain, with the inter­plane distances being 3.53 Å. Careful examination of the structure indicates that strong inter­chain hydrogen bonds of O3W—H1A···O1iii [2.695 (6) Å; Symmetry code: (iii) x-1, -y+2, -z+2] exist between the two independent chains. It is clear that the hydrogen (H1A) atoms of one coordinated water molecule serve as the acceptors, while the oxygen (O1iii) atoms of the mpda ligands serve as the donors in each self-recognition site. The above-mentioned ππ and O3W—H1A···O1iii inter­actions bring the helical coordination chains into wave-shaped two-dimensional layers. Further a three-dimensional supra­molecular architecture is result from wave-shaped motifs through the inter­layer hydrogen bonds of O3W—H1B···O2iv [2.736 (8) Å; Symmetry code: (iv) x-1/2, -y+3/2, -z+2].

Related literature top

For V-shaped metal complexes coordinated by the phenylenediacrylate anion, see: Liu et al. (2013). For related metal-organic coordination polymers with an m-phenylenedicarboxylate ligand, see: Yang et al. (2014).

Structure description top

In crystal engineering, a great inter­est is focused on the supra­molecular self-assembly of helical or chiral coordination polymers from appropriately bridging ligands and metallic tectons through either coordinate bonds and hydrogen bonds. Although much effort has been devoted to the assembly of helical or chiral coordination polymers based on chiral or achiral ligands, the design and construction of chiral coordination polymer based on helical topology is still a great challenge for chemists.

All reagents and solvents employed were commercially available and were used as received without further purification.

The m-phenyl­enediacrylate (mpda) has various conformations for the rotation of carbon-carbon bonds, such as the C—C single bonds between aromatic rings and C=C bonds. The V-shaped mpda coordinated with metal ions have been documented (Liu et al., 2013). But the mpda has not been well exploited in constructing metal-organic coordination polymers in comparison with the m-phenyl­enedi­carboxyl­ate ligand (Yang et al., 2014). Herein, we report a poly[(m-phenyl­enediacrylate)(water)cadmium] with the formulae [Cd(mpda)(H2O)2]n (1). The title compound crystallizes in the chiral C222 (1) space group, and contains a homochiral left-handed single-stranded helical chain.

In the structure of 1 (Fig. 1), the Cd2+ centre adopts a six-coordinated mode with a distorted o­cta­hedral geometry (CdO6) via binding to two water O atoms and four O atoms from two different CO2- groups of mpda ligands [O1, O2, O1i, O2i; symmetry code: (i) x,-y+2,-z+2]. The Cd—O distances range from 2.199 (7) to 2.380 (6) Å. Taking account of the O3W—Cd1—O3Wi angle of 92.1 (4)°, the coordination mode of Cd2+ ion may play an determining role in the formation of the Cd1i···Cd1···Cd1i angle of 85.65°. Each mpda ligand with a monodentate mode bridges two different Cd2+ ions, via carboxyl­ate groups at each end of the ligand molecule. Of the structure of the mpda, two acrylate groups (CH=CH-COO-) are located at the benzene ring in a trans-position fashion. The dihedral angles of the CH=CH-COO- and C6H4—CH=CH group are ca.11.4° and 7.9°, respectively, while that of C1···C7···C6···C1i is 180°. These dihedral angle data indicate that the mpda ligand is nearly coplanar and there exist intra­molecular π-π electronic conjugations.

The mpda ligands serve as V-shaped bridges to link the metal ions into infinite helical coordination chains running along the c-axis, with the Cd···Cd distance separated by mpda being 14.54 Å. The helical pitch of 19.767 (5) Å is equal to the c dimension of the unit cell. There has the one and only left-handed single-stranded chain in 1, which reveals that this work presents a new unusual example of homochiral architecture based on the helical topology. In 1, the packing of the helical chains is sustained by complicated hydrogen bonds and ππ stacking involving all the coordinated water molecules, and the C=C double bonds and phenyl­ene rings of the mpda ligands. Each phenyl­ene ring from one chain inter­acts with a C=C double bond from another chain, with the inter­plane distances being 3.53 Å. Careful examination of the structure indicates that strong inter­chain hydrogen bonds of O3W—H1A···O1iii [2.695 (6) Å; Symmetry code: (iii) x-1, -y+2, -z+2] exist between the two independent chains. It is clear that the hydrogen (H1A) atoms of one coordinated water molecule serve as the acceptors, while the oxygen (O1iii) atoms of the mpda ligands serve as the donors in each self-recognition site. The above-mentioned ππ and O3W—H1A···O1iii inter­actions bring the helical coordination chains into wave-shaped two-dimensional layers. Further a three-dimensional supra­molecular architecture is result from wave-shaped motifs through the inter­layer hydrogen bonds of O3W—H1B···O2iv [2.736 (8) Å; Symmetry code: (iv) x-1/2, -y+3/2, -z+2].

For V-shaped metal complexes coordinated by the phenylenediacrylate anion, see: Liu et al. (2013). For related metal-organic coordination polymers with an m-phenylenedicarboxylate ligand, see: Yang et al. (2014).

Synthesis and crystallization top

A mixture of Cd(NO3)2·4H2O (62 mg, 0.25 mmol), m-phenyl­enediacrylic acid (H2mpda, 44 mg, 0.2 mmol) and H2O (10 mL) was sealed in a 25 mL stainless steel reactor with a Teflon liner, heated to 413 K for 3 d and then cooled to room temperature. The crystals were washed with methanol to give the title complex in about 35% yield (based on the H2mpda ligand).

Refinement details top

All non-hydrogen atoms are easily found from the different Fourier maps and refined anisotropically. All H atoms of H2O molecules are found in the difference Fourier map. The C-bound H atoms of aromatic rings were refined using a riding model [0.93 Å (CH) and Uiso(H) = 1.2Ueq(C)].

Computing details top

Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2008)); software used to prepare material for publication: PLATON (Spek, 2009).

Figures top
[Figure 1] Fig. 1. Part of the crystal structure of the mpda ligand and CdII centres in (1), showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level. [Symmetry codes: (i) x, -y + 2, -z + 2; (ii) -x + 2, y, -z + 3/2].
catena-Poly[[diaquacadmium(II)]-µ-3,3'-(1,3-phenylene)diacrylato] top
Crystal data top
[Cd(C12H8O4)(H2O)2]F(000) = 720
Mr = 364.62Dx = 1.922 Mg m3
Orthorhombic, C2221Mo Kα radiation, λ = 0.71073 Å
Hall symbol: C 2c 2Cell parameters from 1107 reflections
a = 5.3145 (12) Åθ = 2.0–25.0°
b = 11.991 (3) ŵ = 1.75 mm1
c = 19.767 (5) ÅT = 293 K
V = 1259.7 (5) Å3Block, colorless
Z = 40.35 × 0.32 × 0.25 mm
Data collection top
Bruker SMART APEXII CCD
diffractometer
1107 independent reflections
Radiation source: fine-focus sealed tube950 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.036
ω scansθmax = 25.0°, θmin = 2.1°
Absorption correction: multi-scan
(SADABS; Bruker, 2008)
h = 56
Tmin = 0.59, Tmax = 0.68k = 1314
3205 measured reflectionsl = 1923
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.039H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.155 w = 1/[σ2(Fo2) + (0.1P)2 + 7.5572P]
where P = (Fo2 + 2Fc2)/3
S = 1.08(Δ/σ)max < 0.001
1107 reflectionsΔρmax = 0.93 e Å3
96 parametersΔρmin = 0.64 e Å3
2 restraintsAbsolute structure: Flack (1983), 1035 Friedel pairs
Primary atom site location: structure-invariant direct methodsAbsolute structure parameter: 0.07 (19)
Crystal data top
[Cd(C12H8O4)(H2O)2]V = 1259.7 (5) Å3
Mr = 364.62Z = 4
Orthorhombic, C2221Mo Kα radiation
a = 5.3145 (12) ŵ = 1.75 mm1
b = 11.991 (3) ÅT = 293 K
c = 19.767 (5) Å0.35 × 0.32 × 0.25 mm
Data collection top
Bruker SMART APEXII CCD
diffractometer
1107 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2008)
950 reflections with I > 2σ(I)
Tmin = 0.59, Tmax = 0.68Rint = 0.036
3205 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.039H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.155Δρmax = 0.93 e Å3
S = 1.08Δρmin = 0.64 e Å3
1107 reflectionsAbsolute structure: Flack (1983), 1035 Friedel pairs
96 parametersAbsolute structure parameter: 0.07 (19)
2 restraints
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
Cd10.00336 (16)1.00001.00000.0311 (3)
O10.2947 (11)0.9898 (5)0.9139 (3)0.0332 (13)
O20.1598 (11)0.8310 (5)0.9546 (3)0.0335 (14)
O3W0.2906 (13)0.8960 (5)1.0493 (4)0.0438 (18)
C10.307 (2)0.8841 (8)0.9156 (4)0.040 (2)
C20.4734 (19)0.8224 (7)0.8726 (5)0.039 (2)
H20.44620.74600.86890.046*
C30.6643 (18)0.8655 (8)0.8375 (4)0.0329 (19)
H30.68940.94200.84110.040*
C40.8387 (19)0.8040 (7)0.7936 (4)0.0297 (19)
C50.848 (2)0.6888 (8)0.7930 (5)0.041 (2)
H50.74720.64940.82310.049*
C61.00000.6307 (10)0.75000.042 (3)
H61.00000.55310.75000.050*
C71.00000.8616 (10)0.75000.033 (3)
H71.00000.93920.75000.039*
H1A0.436 (7)0.917 (7)1.062 (4)0.02 (2)*
H1B0.288 (15)0.826 (2)1.056 (4)0.01 (2)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cd10.0265 (5)0.0292 (5)0.0377 (5)0.0000.0000.0032 (3)
O10.029 (3)0.024 (3)0.046 (3)0.001 (3)0.007 (3)0.001 (3)
O20.012 (3)0.027 (3)0.062 (4)0.006 (3)0.013 (3)0.004 (3)
O3W0.024 (4)0.028 (3)0.079 (5)0.002 (3)0.015 (4)0.001 (4)
C10.053 (6)0.040 (5)0.027 (4)0.009 (5)0.000 (5)0.009 (4)
C20.031 (5)0.026 (4)0.059 (6)0.015 (5)0.006 (5)0.007 (4)
C30.024 (4)0.037 (5)0.038 (5)0.008 (4)0.005 (4)0.001 (4)
C40.030 (4)0.031 (5)0.028 (4)0.004 (5)0.004 (4)0.002 (3)
C50.046 (6)0.030 (5)0.046 (5)0.012 (5)0.008 (5)0.004 (4)
C60.048 (8)0.024 (6)0.054 (7)0.0000.008 (8)0.000
C70.041 (7)0.025 (6)0.032 (6)0.0000.006 (7)0.000
Geometric parameters (Å, º) top
Cd1—O1i2.329 (6)C2—C31.334 (13)
Cd1—O12.329 (6)C2—H20.9300
Cd1—O2i2.380 (6)C3—C41.468 (12)
Cd1—O22.380 (6)C3—H30.9300
Cd1—O3W2.199 (7)C4—C51.383 (14)
Cd1—O3Wi2.199 (7)C4—C71.398 (10)
Cd1—C1i2.727 (10)C5—C61.363 (12)
O1—C11.270 (12)C5—H50.9300
O2—C11.269 (12)C6—C5ii1.363 (12)
O3W—H1A0.85 (2)C6—H60.9300
O3W—H1B0.84 (2)C7—C4ii1.398 (10)
C1—C21.432 (14)C7—H70.9300
O3W—Cd1—O3Wi92.1 (4)Cd1—O3W—H1B128 (6)
O3W—Cd1—O1i100.3 (3)H1A—O3W—H1B105 (9)
O3Wi—Cd1—O1i140.0 (2)O2—C1—O1119.0 (9)
O3W—Cd1—O1140.0 (2)O2—C1—C2118.8 (9)
O3Wi—Cd1—O1100.3 (3)O1—C1—C2122.1 (9)
O1i—Cd1—O194.3 (3)C3—C2—C1125.3 (9)
O3W—Cd1—O2i124.6 (3)C3—C2—H2117.3
O3Wi—Cd1—O2i86.4 (2)C1—C2—H2117.3
O1i—Cd1—O2i55.3 (2)C2—C3—C4126.4 (8)
O1—Cd1—O2i94.2 (2)C2—C3—H3116.8
O3W—Cd1—O286.4 (2)C4—C3—H3116.8
O3Wi—Cd1—O2124.6 (3)C5—C4—C7117.8 (9)
O1i—Cd1—O294.2 (2)C5—C4—C3122.0 (9)
O1—Cd1—O255.3 (2)C7—C4—C3120.2 (8)
O2i—Cd1—O2137.3 (3)C6—C5—C4122.6 (10)
O3W—Cd1—C1i116.0 (3)C6—C5—H5118.7
O3Wi—Cd1—C1i113.7 (3)C4—C5—H5118.7
O1i—Cd1—C1i27.7 (3)C5—C6—C5ii118.5 (12)
O1—Cd1—C1i93.6 (3)C5—C6—H6120.7
O2i—Cd1—C1i27.7 (3)C5ii—C6—H6120.7
O2—Cd1—C1i116.4 (3)C4ii—C7—C4120.8 (11)
C1—O1—Cd193.9 (6)C4ii—C7—H7119.6
C1—O2—Cd191.5 (5)C4—C7—H7119.6
Cd1—O3W—H1A127 (6)
Symmetry codes: (i) x, y+2, z+2; (ii) x+2, y, z+3/2.
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O3W—H1A···O1iii0.85 (2)1.88 (4)2.695 (9)160 (8)
O3W—H1B···O2iv0.84 (2)1.92 (3)2.736 (8)162 (8)
Symmetry codes: (iii) x1, y+2, z+2; (iv) x1/2, y+3/2, z+2.
Selected bond lengths (Å) top
Cd1—O12.329 (6)Cd1—O3W2.199 (7)
Cd1—O22.380 (6)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
O3W—H1A···O1i0.85 (2)1.88 (4)2.695 (9)160 (8)
O3W—H1B···O2ii0.84 (2)1.92 (3)2.736 (8)162 (8)
Symmetry codes: (i) x1, y+2, z+2; (ii) x1/2, y+3/2, z+2.
 

Acknowledgements

This work was supported by the Scientific and Technological Research Programs of Chongqing Municipal Education Commission (grant Nos. KJ130638 and KJ100602) and the Program for Innovation Team Building at Institutions of Higher Education in Chongqing City of China (grant No. KJTD201309).

References

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ISSN: 2056-9890
Volume 71| Part 4| April 2015| Pages m91-m92
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