metal-organic compounds
Monoclinic polymorph of poly[aqua(μ4-hydrogen tartrato)sodium]
aSchool of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, bSchool of Chemical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and cX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
*Correspondence e-mail: hkfun@usm.my
A monoclinic polymorph of the title compound, [Na(C4H5O6)(H2O)]n, is reported and complements an orthorhombic form [Kubozono, Hirano, Nagasawa, Maeda & Kashino (1993). Bull. Chem. Soc. Jpn, 66, 2166–2173]. The contains a hydrogen tartrate anion, an Na+ cation and a water molecule. The Na+ ion is surrounded by seven O atoms derived from one independent and three symmetry-related hydrogen tartrate anions, and a water molecule, forming a distorted pentagonal–bipyramidal geometry. Independent units are linked via a pair of intermolecular bifurcated O—H⋯O acceptor bonds, generating an R21(6) ring motif to form polymeric two-dimensional arrays parallel to the (100) plane. In the crystal packing, the arrays are linked by adjacent ring motifs, together with additional intermolecular O—H⋯O interactions, into a three-dimensional network.
Related literature
For the optical activity of tartaric acid, see: Synoradzki et al. (2008). For Na—O distances, see: Wong et al. (2009). For the orthorhombic polymorph of C4H5O6Na·H2O, see: Kubozono et al. (1993). For hydrogen-bond motifs, see: Bernstein et al. (1995). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536810000681/tk2611sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810000681/tk2611Isup2.hkl
Anhydrous tartaric acid (1.5 g, 0.1 mmol) was dissolved in water in a flat bottom flask with magnetic stirrer. In a separating funnel, sodium bicarbonate (0.85g, 0.1 mmol) was dissolved in water. The sodium bicarbonate solution was added in small portions to the flask of tartaric acid with stirring. The reaction mixture was refluxed for 1 h. After cooling the reaction mixture to room temperature, it was left for overnight stirring. The colourless crystals that subsequently formed were filtered and washed with methanol and dried at 353 K.
All H atoms were located in a difference Fourier map and fixed at these positions [C—H = 0.92–1.00 Å; O—H = 0.77–0.90 Å] and Uiso(H) = 1.2 Ueq(C) and 1.5 Ueq(O).
Tartaric acid is found free throughout nature, especially in many fruits and in wine, and as salts with Ca2+, K+, and Na+. It has many applications such as in making silver mirrors, in the manufacture of soft drinks, to provide tartness to foods, in tanning leather, and in making blueprints. Tartaric acid has optical activity (Synoradzki et al., 2008).
Kubozono et al. (1993) reported the structure of the title compound, in the orthorhombic
P212121. Herein, a new polymorph of the title compound is reported which crystallizes in the monoclinic P21/c. The contains a hydrogen tartrate anion, a Na cation and a water molecule (Fig. 1). The independent unit forms polymeric two-dimensional networks parallel to the plane (100) (Fig. 2). Each Na+ ion is surrounded by seven O atoms (Fig. 3) derived from a independent and three symmetry related hydrogen tartrate anions; and a water molecule, forming a distorted pentagonal bipyramidal geometry with Na—O distances ranging from 2.3331 (12) to 2.6740 (12) Å which are comparable to those reported in (Wong et al., 2009), whereas the angles around the Na+ ion range from 62.55 (4) to 151.93 (4)°. Bond lengths and angles are within normal ranges and comparable to the orthorhombic polymorph of C4H5O6Na.H2O (Kubozono et al., 1993).The molecular structure is linked via intermolecular bifurcated O1W—H1W1···O5 and O3—H1O3···O5 acceptor bonds, generating R12(6) ring motif (Bernstein et al., 1995). In the crystal packing (Fig. 4), the polymeric two-dimensional arrays are linked by adjacent ring motifs, together with intermolecular O1—H1O1···O6, O1W—H2W1···O6 and O4—H1O4···O1W interactions, into a three-dimensional network.
For the optical activity of tartaric acid, see: Synoradzki et al. (2008). For Na—O distances, see: Wong et al. (2009). For the orthorhombic polymorph of C4H5O6Na.H2O, see: Kubozono et al. (1993). For hydrogen-bond motifs, see: Bernstein et al. (1995). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. The asymmetric unit of the title compound, showing 50% probability displacement ellipsoids for non-H atoms and the atom-numbering scheme. | |
Fig. 2. The polymeric structure of the title compound, viewed down the a axis, showing 2-dimensional array parallel to the (100) plane. All H atoms have been omitted for clarity. | |
Fig. 3. Part of a 2-dimensional array, highlighting the coordination environment for Na+. Displacement ellipsoids are drawn at the 50% probability level. H atoms have been omitted for clarity. Symmetry codes: (%) -x, 1/2 + y, 3/2 - z; (#) -x, -1/2 + y, 1/2 - z; ($) x, 3/2 - y, -1/2 + z. | |
Fig. 4. The crystal packing of the title compound, viewed down the b axis. Hydrogen bonds are shown as dashed lines. C-bound H atoms have been omitted for clarity. |
[Na(C4H5O6)(H2O)] | F(000) = 392 |
Mr = 190.09 | Dx = 1.884 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1671 reflections |
a = 8.9723 (2) Å | θ = 2.6–29.9° |
b = 7.1457 (1) Å | µ = 0.24 mm−1 |
c = 12.0186 (2) Å | T = 100 K |
β = 119.571 (1)° | Needle, colourless |
V = 670.18 (2) Å3 | 0.40 × 0.09 × 0.05 mm |
Z = 4 |
Bruker SMART APEXII CCD area-detector diffractometer | 1947 independent reflections |
Radiation source: fine-focus sealed tube | 1532 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.034 |
φ and ω scans | θmax = 30.0°, θmin = 2.6° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −12→12 |
Tmin = 0.895, Tmax = 0.979 | k = −10→10 |
6649 measured reflections | l = −13→16 |
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)] = 0.037 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.092 | All H-atom parameters refined |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0406P)2 + 0.2259P] where P = (Fo2 + 2Fc2)/3 |
1947 reflections | (Δ/σ)max < 0.001 |
109 parameters | Δρmax = 0.51 e Å−3 |
0 restraints | Δρmin = −0.29 e Å−3 |
[Na(C4H5O6)(H2O)] | V = 670.18 (2) Å3 |
Mr = 190.09 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.9723 (2) Å | µ = 0.24 mm−1 |
b = 7.1457 (1) Å | T = 100 K |
c = 12.0186 (2) Å | 0.40 × 0.09 × 0.05 mm |
β = 119.571 (1)° |
Bruker SMART APEXII CCD area-detector diffractometer | 1947 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 1532 reflections with I > 2σ(I) |
Tmin = 0.895, Tmax = 0.979 | Rint = 0.034 |
6649 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 0 restraints |
wR(F2) = 0.092 | All H-atom parameters refined |
S = 1.03 | Δρmax = 0.51 e Å−3 |
1947 reflections | Δρmin = −0.29 e Å−3 |
109 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cyrosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K. |
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. |
x | y | z | Uiso*/Ueq | ||
Na1 | −0.01684 (8) | 0.60710 (8) | 0.68653 (6) | 0.01242 (15) | |
O1 | 0.40344 (13) | 0.43067 (13) | 1.07635 (10) | 0.0119 (2) | |
H1O1 | 0.4044 | 0.3103 | 1.0786 | 0.018* | |
C1 | 0.26779 (18) | 0.50448 (18) | 0.97844 (15) | 0.0099 (3) | |
O1W | −0.25610 (13) | 0.58582 (13) | 0.72347 (11) | 0.0129 (2) | |
H1W1 | −0.2558 | 0.6856 | 0.7595 | 0.019* | |
H2W1 | −0.3646 | 0.5522 | 0.6686 | 0.019* | |
O2 | 0.15291 (13) | 0.41821 (13) | 0.89112 (11) | 0.0130 (2) | |
C2 | 0.26731 (18) | 0.71881 (18) | 0.98483 (14) | 0.0088 (3) | |
H2A | 0.3650 | 0.7643 | 0.9739 | 0.011* | |
O3 | 0.10842 (13) | 0.79014 (13) | 0.88733 (10) | 0.0106 (2) | |
H1O3 | 0.0405 | 0.7814 | 0.9094 | 0.016* | |
C3 | 0.29897 (18) | 0.78670 (18) | 1.11559 (14) | 0.0094 (3) | |
H3A | 0.4058 | 0.7442 | 1.1778 | 0.011* | |
O4 | 0.16227 (13) | 0.72503 (13) | 1.13335 (11) | 0.0128 (2) | |
H1O4 | 0.1864 | 0.6265 | 1.1677 | 0.019* | |
C4 | 0.30326 (18) | 1.00147 (18) | 1.11769 (14) | 0.0100 (3) | |
O5 | 0.19847 (14) | 1.08865 (13) | 1.13774 (11) | 0.0148 (2) | |
O6 | 0.41681 (13) | 1.07517 (13) | 1.09721 (11) | 0.0122 (2) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Na1 | 0.0142 (3) | 0.0111 (3) | 0.0123 (3) | −0.0020 (2) | 0.0068 (3) | −0.0009 (2) |
O1 | 0.0127 (5) | 0.0075 (4) | 0.0133 (6) | 0.0015 (4) | 0.0046 (5) | 0.0013 (4) |
C1 | 0.0125 (7) | 0.0096 (6) | 0.0112 (7) | 0.0011 (5) | 0.0087 (6) | 0.0002 (5) |
O1W | 0.0130 (5) | 0.0103 (5) | 0.0156 (6) | −0.0014 (4) | 0.0071 (5) | −0.0022 (4) |
O2 | 0.0135 (5) | 0.0099 (4) | 0.0130 (6) | −0.0008 (4) | 0.0045 (5) | −0.0016 (4) |
C2 | 0.0092 (6) | 0.0080 (6) | 0.0085 (7) | 0.0009 (5) | 0.0040 (6) | 0.0009 (5) |
O3 | 0.0098 (5) | 0.0119 (5) | 0.0097 (5) | 0.0016 (4) | 0.0044 (4) | 0.0012 (4) |
C3 | 0.0107 (7) | 0.0075 (6) | 0.0100 (7) | 0.0001 (5) | 0.0050 (6) | 0.0003 (5) |
O4 | 0.0164 (5) | 0.0093 (4) | 0.0172 (6) | 0.0014 (4) | 0.0118 (5) | 0.0030 (4) |
C4 | 0.0107 (7) | 0.0087 (6) | 0.0071 (7) | −0.0006 (5) | 0.0016 (6) | −0.0012 (5) |
O5 | 0.0133 (5) | 0.0108 (5) | 0.0212 (6) | 0.0009 (4) | 0.0092 (5) | −0.0033 (4) |
O6 | 0.0137 (5) | 0.0092 (4) | 0.0145 (6) | 0.0000 (4) | 0.0076 (5) | 0.0006 (4) |
Na1—O4i | 2.3331 (12) | C2—O3 | 1.4201 (17) |
Na1—O1W | 2.4020 (12) | C2—C3 | 1.531 (2) |
Na1—O3ii | 2.4235 (11) | C2—H2A | 1.0020 |
Na1—O3 | 2.4741 (12) | O3—Na1iii | 2.4235 (11) |
Na1—O2iii | 2.4858 (11) | O3—H1O3 | 0.7774 |
Na1—O2 | 2.5479 (12) | C3—O4 | 1.4150 (16) |
Na1—O5i | 2.6740 (12) | C3—C4 | 1.5350 (18) |
O1—C1 | 1.3155 (18) | C3—H3A | 0.9288 |
O1—H1O1 | 0.8604 | O4—Na1iv | 2.3332 (11) |
C1—O2 | 1.2149 (18) | O4—H1O4 | 0.7905 |
C1—C2 | 1.5336 (18) | C4—O5 | 1.2465 (17) |
O1W—H1W1 | 0.8339 | C4—O6 | 1.2741 (17) |
O1W—H2W1 | 0.8983 | O5—Na1iv | 2.6740 (12) |
O2—Na1ii | 2.4858 (11) | ||
O4i—Na1—O1W | 151.93 (4) | C1—O2—Na1ii | 145.91 (10) |
O4i—Na1—O3ii | 122.35 (4) | C1—O2—Na1 | 114.40 (9) |
O1W—Na1—O3ii | 80.57 (4) | Na1ii—O2—Na1 | 99.35 (4) |
O4i—Na1—O3 | 87.29 (4) | O3—C2—C3 | 109.60 (11) |
O1W—Na1—O3 | 82.55 (4) | O3—C2—C1 | 110.09 (11) |
O3ii—Na1—O3 | 139.47 (4) | C3—C2—C1 | 111.35 (11) |
O4i—Na1—O2iii | 73.41 (4) | O3—C2—H2A | 111.2 |
O1W—Na1—O2iii | 78.92 (4) | C3—C2—H2A | 107.5 |
O3ii—Na1—O2iii | 133.11 (4) | C1—C2—H2A | 107.0 |
O3—Na1—O2iii | 78.23 (4) | C2—O3—Na1iii | 131.19 (8) |
O4i—Na1—O2 | 111.86 (4) | C2—O3—Na1 | 113.77 (8) |
O1W—Na1—O2 | 87.20 (4) | Na1iii—O3—Na1 | 103.19 (4) |
O3ii—Na1—O2 | 77.97 (4) | C2—O3—H1O3 | 109.0 |
O3—Na1—O2 | 64.61 (4) | Na1iii—O3—H1O3 | 91.1 |
O2iii—Na1—O2 | 141.72 (4) | Na1—O3—H1O3 | 103.6 |
O4i—Na1—O5i | 62.55 (4) | O4—C3—C2 | 108.69 (11) |
O1W—Na1—O5i | 144.66 (4) | O4—C3—C4 | 109.00 (11) |
O3ii—Na1—O5i | 65.28 (3) | C2—C3—C4 | 108.91 (12) |
O3—Na1—O5i | 117.44 (4) | O4—C3—H3A | 113.8 |
O2iii—Na1—O5i | 131.27 (4) | C2—C3—H3A | 108.5 |
O2—Na1—O5i | 77.41 (4) | C4—C3—H3A | 107.8 |
C1—O1—H1O1 | 114.8 | C3—O4—Na1iv | 130.28 (8) |
O2—C1—O1 | 125.82 (12) | C3—O4—H1O4 | 108.8 |
O2—C1—C2 | 121.86 (13) | Na1iv—O4—H1O4 | 111.3 |
O1—C1—C2 | 112.32 (12) | O5—C4—O6 | 125.60 (12) |
Na1—O1W—H1W1 | 105.6 | O5—C4—C3 | 119.18 (12) |
Na1—O1W—H2W1 | 128.7 | O6—C4—C3 | 115.22 (12) |
H1W1—O1W—H2W1 | 109.5 | C4—O5—Na1iv | 118.45 (9) |
O1—C1—O2—Na1ii | 13.8 (3) | O4i—Na1—O3—C2 | −82.64 (9) |
C2—C1—O2—Na1ii | −165.96 (11) | O1W—Na1—O3—C2 | 123.57 (9) |
O1—C1—O2—Na1 | −157.55 (11) | O3ii—Na1—O3—C2 | 57.61 (8) |
C2—C1—O2—Na1 | 22.65 (16) | O2iii—Na1—O3—C2 | −156.25 (9) |
O4i—Na1—O2—C1 | 46.35 (11) | O2—Na1—O3—C2 | 33.14 (8) |
O1W—Na1—O2—C1 | −112.44 (10) | O5i—Na1—O3—C2 | −25.64 (10) |
O3ii—Na1—O2—C1 | 166.61 (10) | O3—C2—C3—O4 | 58.74 (14) |
O3—Na1—O2—C1 | −29.37 (9) | C1—C2—C3—O4 | −63.32 (14) |
O2iii—Na1—O2—C1 | −44.32 (10) | O3—C2—C3—C4 | −59.89 (14) |
O5i—Na1—O2—C1 | 99.59 (10) | C1—C2—C3—C4 | 178.05 (11) |
O2—C1—C2—O3 | 7.77 (19) | C2—C3—O4—Na1iv | −126.79 (10) |
O1—C1—C2—O3 | −172.06 (11) | C4—C3—O4—Na1iv | −8.22 (17) |
O2—C1—C2—C3 | 129.54 (15) | O4—C3—C4—O5 | 2.38 (19) |
O1—C1—C2—C3 | −50.29 (15) | C2—C3—C4—O5 | 120.82 (15) |
C3—C2—O3—Na1iii | 66.43 (14) | O4—C3—C4—O6 | −177.16 (12) |
C1—C2—O3—Na1iii | −170.76 (8) | C2—C3—C4—O6 | −58.73 (17) |
C3—C2—O3—Na1 | −157.80 (8) | O6—C4—O5—Na1iv | −177.69 (12) |
C1—C2—O3—Na1 | −34.99 (13) | C3—C4—O5—Na1iv | 2.82 (18) |
Symmetry codes: (i) x, −y+3/2, z−1/2; (ii) −x, y−1/2, −z+3/2; (iii) −x, y+1/2, −z+3/2; (iv) x, −y+3/2, z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1O1···O6v | 0.86 | 1.69 | 2.5496 (13) | 175 |
O1W—H1W1···O5vi | 0.83 | 1.94 | 2.7585 (14) | 167 |
O1W—H2W1···O6vii | 0.90 | 1.94 | 2.8006 (15) | 161 |
O3—H1O3···O5vi | 0.78 | 2.14 | 2.7575 (19) | 137 |
O4—H1O4···O1Wviii | 0.79 | 1.90 | 2.6784 (14) | 170 |
Symmetry codes: (v) x, y−1, z; (vi) −x, −y+2, −z+2; (vii) x−1, −y+3/2, z−1/2; (viii) −x, −y+1, −z+2. |
Experimental details
Crystal data | |
Chemical formula | [Na(C4H5O6)(H2O)] |
Mr | 190.09 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 8.9723 (2), 7.1457 (1), 12.0186 (2) |
β (°) | 119.571 (1) |
V (Å3) | 670.18 (2) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.24 |
Crystal size (mm) | 0.40 × 0.09 × 0.05 |
Data collection | |
Diffractometer | Bruker SMART APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.895, 0.979 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 6649, 1947, 1532 |
Rint | 0.034 |
(sin θ/λ)max (Å−1) | 0.703 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.037, 0.092, 1.03 |
No. of reflections | 1947 |
No. of parameters | 109 |
H-atom treatment | All H-atom parameters refined |
Δρmax, Δρmin (e Å−3) | 0.51, −0.29 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1O1···O6i | 0.86 | 1.69 | 2.5496 (13) | 175 |
O1W—H1W1···O5ii | 0.83 | 1.94 | 2.7585 (14) | 167 |
O1W—H2W1···O6iii | 0.90 | 1.94 | 2.8006 (15) | 161 |
O3—H1O3···O5ii | 0.78 | 2.14 | 2.7575 (19) | 137 |
O4—H1O4···O1Wiv | 0.79 | 1.90 | 2.6784 (14) | 170 |
Symmetry codes: (i) x, y−1, z; (ii) −x, −y+2, −z+2; (iii) x−1, −y+3/2, z−1/2; (iv) −x, −y+1, −z+2. |
Acknowledgements
HHA gratefully acknowledges funding from Universiti Sains Malaysia (USM) under a University Research Grant (No. 1001/PKIMIA/811142). HKF and CKQ thank USM for a Research University Golden Goose Grant (No. 1001/PFIZIK/811012). CKQ thanks USM for a Research Fellowship.
References
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Tartaric acid is found free throughout nature, especially in many fruits and in wine, and as salts with Ca2+, K+, and Na+. It has many applications such as in making silver mirrors, in the manufacture of soft drinks, to provide tartness to foods, in tanning leather, and in making blueprints. Tartaric acid has optical activity (Synoradzki et al., 2008).
Kubozono et al. (1993) reported the structure of the title compound, in the orthorhombic space group P212121. Herein, a new polymorph of the title compound is reported which crystallizes in the monoclinic space group P21/c. The asymmetric unit contains a hydrogen tartrate anion, a Na cation and a water molecule (Fig. 1). The independent unit forms polymeric two-dimensional networks parallel to the plane (100) (Fig. 2). Each Na+ ion is surrounded by seven O atoms (Fig. 3) derived from a independent and three symmetry related hydrogen tartrate anions; and a water molecule, forming a distorted pentagonal bipyramidal geometry with Na—O distances ranging from 2.3331 (12) to 2.6740 (12) Å which are comparable to those reported in (Wong et al., 2009), whereas the angles around the Na+ ion range from 62.55 (4) to 151.93 (4)°. Bond lengths and angles are within normal ranges and comparable to the orthorhombic polymorph of C4H5O6Na.H2O (Kubozono et al., 1993).
The molecular structure is linked via intermolecular bifurcated O1W—H1W1···O5 and O3—H1O3···O5 acceptor bonds, generating R12(6) ring motif (Bernstein et al., 1995). In the crystal packing (Fig. 4), the polymeric two-dimensional arrays are linked by adjacent ring motifs, together with intermolecular O1—H1O1···O6, O1W—H2W1···O6 and O4—H1O4···O1W interactions, into a three-dimensional network.