Crystal structure of sodium (1S)-d-mannit-1-yl­sulfonate

Haines, A.H.; Hughes, D.L.

doi:10.1107/S2056989018011556

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ISSN: 2056-9890

Volume 74| Part 9| September 2018| Pages 1314-1318

https://doi.org/10.1107/S2056989018011556

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Crystal structure of sodium (1S)-D-mannit-1-ylsulfonate

Alan H. Haines ^a ^* and David L. Hughes ^a ^*

^aSchool of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK
^*Correspondence e-mail: a.haines@uea.ac.uk, d.l.hughes@uea.ac.uk

Edited by W. T. A. Harrison, University of Aberdeen, Scotland (Received 13 August 2018; accepted 15 August 2018; online 24 August 2018)

The title salt, Na⁺·C₆H₁₃O₉S⁻ [systematic name: sodium (1S,2S,3S,4R,5R)-1,2,3,4,5,6-hexahydroxyhexane-1-sulfonate], is formed by reaction of D-mannose with sodium bisulfite (sodium hydrogen sulfite) in water. The anion has an open-chain structure with the S atom and the C atoms of the carbohydrate chain forming an essentially planar zigzag chain in which the absolute values of the torsion angles lie between 173.6 (2) and 179.9 (3)°. The sodium cations are penta-coordinated by O atoms, with one link to a carbohydrate O atom and four to O atoms of sulfonate residues in separate anions, thus creating a three-dimensional network. The carbohydrate anions are arranged in a head (–SO₃⁻) to head (–SO₃⁻) arrangement, thereby forming two parallel sheets linked through coordination to sodium ions, with each sheet containing intermolecular hydrogen bonds between the anionic residues. Unusually, the double sheets are not connected to neighbouring sets of double sheets, either by ion coordination or intermolecular hydrogen bonding.

Keywords: crystal structure; D-mannose bisulfite adduct; sodium hydrogen sulfite; sodium metabisulfite.

CCDC reference: 1862155

1. Chemical context

Adducts formed by the reaction of aldehydes and bisulfite anions have long been used for aldehyde purification since they are often crystalline, whereas the parent aldehydes are often liquids with varying stabilities on storage. The addition reaction is reversible, which makes the bisulfite compounds useful intermediates in the synthesis of other adducts from aldehydes, such as cyanohydrins. Further, bisulfite adducts are useful since they are soluble in water, which can be important if the compounds need to be compatible with aqueous, biological systems, for example to aid delivery of medicinal drugs insoluble in water. Such considerations are important since aldehydes are involved in many synthetic processes for the production of commercially relevant compounds, including pharmaceuticals, and the relative advantages of using different counter-ions (e.g. stability, hygroscopicity, ease of filtration of the adduct) are of interest (Kissane et al., 2013 ).

The bisulfite addition products of aldoses are unusual in that they are acyclic compounds despite the fact that the parent carbohydrates exist predominantly in the cyclic, hemi-acetal form. Although such adducts were synthesised many years ago, unequivocal proof of their acyclic nature awaited X-ray structure determination, firstly on the potassium adducts of D-glucose and D-mannose (Cole et al., 2001 ), of D-galactose (Haines & Hughes, 2010 ), D-ribose (Haines & Hughes, 2014 ), D-lyxose (Haines & Hughes, 2015 ), and of the sodium adducts of D-glucose (Haines & Hughes, 2012 ) and D-lyxose (Haines & Hughes, 2016 ).

We now report the preparation, properties, and crystal structure of the sodium bisulfite adduct of D-mannose, and comment on its significant structural difference from that of the corresponding potassium adduct.

Mixing concentrated, equimolar solutions of D-mannose and sodium bisulfite (sodium hydrogen sulfite formed by the in situ hydrolysis of sodium metabisulfite) in water led to immediate precipitation of the adduct in high yield; this was purified by recrystallization from water, giving material stable in air but which melted over a large temperature range (413–444 K) with extended and continual decomposition.

Obtaining suitable crystals for X-ray analysis was challenging since there was a tendency for formation of thin, rough, multiple crystals, but slow crystallization at approximately 283–286 K and careful selection from the crop so-produced afforded the crystal for examination. The newly formed chiral centre at C1 had the S-configuration and in solution in water:acetic acid (9:1) the adduct gave a positive rotation which remained stable over an extended period, suggesting that hydrolysis to its component parts was hindered under the acidic conditions.

2. Structural commentary

The newly formed chiral centre at C1 has the S-configuration (as shown in Fig. 1) and the systematic name for the salt is sodium (1S,2S,3S,4R,5R)-1,2,3,4,5,6-hexahydroxyhexane-1-sulfonate. The anion has an open-chain structure in which the S atom and the C atoms of the sugar chain form an essentially planar zigzag (all-trans) chain with the corresponding torsion angles lying between the absolute values of 173.6 (2) and 179.9 (3)°. The hydrogen atoms of the hydroxyl groups on C1 to C6 of the carbon chain form hydrogen bonds with oxygen atoms O2, O13, O5, O3, O6 and O4, respectively, of neighbouring chains (Fig. 1 and Table 1) and all the hydroxyl O atoms except O1 are acceptors of hydrogen bonds; O1 is bonded to a sodium ion. We note that all the hydrogen bonds are arranged in cyclic systems, some comprising four O—H⋯O bonds, others with two O—H⋯O bonds plus two Na—O coordination bonds.

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1O⋯O2ⁱⁱ	0.81 (3)	1.92 (4)	2.693 (4)	160 (8)
O2—H2O⋯O1	0.81 (3)	2.36 (5)	2.828 (3)	118 (5)
O2—H2O⋯O13ⁱ	0.81 (3)	2.08 (4)	2.745 (4)	140 (5)
O3—H3O⋯O4	0.81 (3)	2.32 (7)	2.838 (3)	123 (7)
O3—H3O⋯O5^v	0.81 (3)	2.11 (6)	2.743 (4)	136 (7)
O4—H4O⋯O3^vi	0.82 (3)	1.87 (3)	2.692 (3)	179 (8)
O5—H5O⋯O6ⁱⁱ	0.80 (3)	1.91 (3)	2.704 (4)	169 (6)
O6—H6O⋯O4ⁱ	0.81 (3)	2.00 (4)	2.753 (4)	154 (6)
O6—H6O⋯O5	0.81 (3)	2.45 (6)	2.853 (4)	112 (5)
Symmetry codes: (i) x, y-1, z; (ii) x-1, y, z; (v) x, y+1, z; (vi) x+1, y, z.

Figure 1
View of the D-mannose–NaHSO₃ adduct, indicating the atom-numbering scheme. All sodium coordination contacts and hydrogen bonds involving the atoms of the sugar adduct are indicated. Displacement ellipsoids are drawn at the 50% probability level. Symmetry codes: (1) 1 − x, y − $[{1\over 2}]$ , 2 − z; (2) 1 + x, y − 1, z; (3) x, y − 1, z; (4) x − 1, y − 1, z; (5) 1 + x, y, z; (6) x − 1, y, z; (7) 1 − x, $[{1\over 2}]$ + y, 2 − z; (8) 1 + x, 1 + y, z; (9) x, 1 + y, z; (10) x − 1, 1 + y, z.

Unusually, the sodium atom has a coordination sphere of five rather than six oxygen atoms, hexa-coordination having been observed in related adducts from D-glucose (Haines & Hughes, 2012) and D-lyxose (Haines & Hughes, 2016). Further, coordination of a sodium ion by O1 of the carbohydrate chain and oxygen atoms O11, O12 and O13 of four different sulfonate groups leads to a sheet of Na ions coordinated to the `heads' of the anions, Fig. 2.

Figure 2
View down the a axis of the crystal packing.

The Na—O bonds have lengths in the range 2.293 (3) to 2.421 (3) Å (Table 2) and form a distorted square pyramidal shape with O1 in the apical site. The next shortest Na–O contact distance is 2.757 Å to O12ⁱⁱⁱ, which would provide a rather distorted octahedral coordination. Twofold screw axes of symmetry (parallel to the b axis) relate the sodium ions in the sheet close to the ab plane at z = 0 and 1, and the zigzag C₆ chains lie approximately normal to this plane and nearly parallel to the c axis. The `tails' of these chains, around the C6,O6 groups, lie close to the z = $[{1\over 2}]$ plane where the screw axes relate them to the tails of adjacent molecules. But, whereas the heads are linked through the sodium atoms across the z = 0 plane, there are no short intermolecular contacts across the z = $[{1\over 2}]$ plane; the shortest contacts here are H61⋯H62¹¹ = 2.57 Å, H61⋯O6¹² = 2.70 Å, H62⋯H5¹³ = 2.60 Å and H62⋯C6¹³ = 2.95 Å, i.e. at normal van der Waals' distances; symmetry codes: (11) 1 − x, y + $[{1\over 2}]$ , 1 − z; (12) 2 − x, y + $[{1\over 2}]$ , 1 − z; (13) 1 − x, y − $[{1\over 2}]$ , 1 − z.

Table 2
Selected bond lengths (Å)

Na—O11ⁱ	2.293 (3)	Na—O1	2.386 (3)
Na—O12ⁱⁱ	2.328 (3)	Na—O13^iv	2.421 (3)
Na—O11ⁱⁱⁱ	2.370 (3)	Na—O12ⁱⁱⁱ	2.757 (3)
Symmetry codes: (i) x, y-1, z; (ii) x-1, y, z; (iii) $[-x+1, y-{\script{1\over 2}}, -z+2]$ ; (iv) x-1, y-1, z.

The neighbours of the zigzag C₆ chains are related only by translation parallel to the a and b axes, Fig. 3; all the cations here are aligned in the same direction. Anions related across the Na coordination plane and about the z = $[{1\over 2}]$ plane have the opposite alignment. Here, we observe a major difference between this sodium complex and the corresponding potassium D-mannose complex (Cole et al., 2001) where each C₆ chain is surrounded by four chains pointing in the opposite direction, as shown in Fig. 4. Hence the distances between the coordination planes are quite different, viz 21.08 Å in the sodium complex, but 11.55 Å for the potassium compound.

Figure 3
View looking along the all-trans sugar chain and neighbouring chains, all pointing in the same direction. Displacement ellipsoids are shown at the 30% probability level. Symmetry codes are defined as for Fig. 1

Figure 4
View looking along the all-trans sugar chain and neighbouring chains in the D-mannose–potassium bisulfite adduct; adjacent chains point in opposing directions. Atom coordinates were taken from the CCDC deposition, code 172060 (Cole et al., 2001

). Atoms are represented by small spheres of arbitrary radii. Symmetry codes: (2) 1 − x, $[{1\over 2}]$ + y, −z; (4) 1 + x, y, z; (5) 1 − x, y − $[{1\over 2}]$ , −z; (7) x, y, z − 1; (8) 1 − x, $[{1\over 2}]$ + y, 1 − z; (9) −x, $[{1\over 2}]$ + y, −z; (11) 1 − x, y − $[{1\over 2}]$ , 1 − z; (12) −x, y − $[{1\over 2}]$ , −z.

3. Supramolecular features

A three-dimensional bonding network exists in the crystal structure through (i) penta-coordination of a sodium cation with oxygens from five different mannose bisulfite residues, and (ii) intermolecular hydrogen bonds from each of the six hydroxyl groups to acceptor oxygen atoms in four different residues.

4. Spectroscopic results

High resolution mass spectrometry in negative ion mode showed, as the base peak in the spectrum, a peak for ([C₆H₁₃O₉S₁]⁻) at m/z 261.0287 and a significant peak was observed at m/z 243.0182 ([C₆H₁₃O₉S₁–H₂O]⁻). A minor peak observed at m/z 359.1194 ([C₁₂H₂₃O₁₂]⁻) was assigned to a dimer ion ([2M − H]⁻) produced by association of a D-mannose molecule (M = C₆H₁₂O₆) with the mono-anion of D-mannose ([C₆H₁₁O₆]⁻) under the electrospray ionization conditions of the mass spectrometric measurement.

The ¹H NMR spectrum of the adduct in D₂O indicated the presence of the α- and β-pyranose forms of D-mannose and the major and minor forms of the acyclic sulfonate in the % ratios 25.24:13.14:55.00:6.62, respectively. Clearly, the R-stereoisomer at C1 is present in solution but only the S-isomer crystallizes. Further, some hydrolysis of the adduct to afford the parent sugar occurs during the NMR measurement.

The ¹³C NMR spectrum showed signals for C1 nuclei at δ_C 94.70, 94.31, 84.43 and 82.34 arising, respectively, from the α- and β-pyranose forms of D-mannose, the minor adduct and the major adduct, in the % ratios of 32.73:15.00:3.64:48.63.

5. Synthesis and crystallization

D-Mannose (0.9 g) was dissolved in water (2 ml), sodium metabisulfite (0.475 g) was added, and the solution was then warmed to achieve complete solution. On cooling to room temperature, precipitation occurred within 3 min (see scheme). The product was collected by filtration, and dried to give the adduct (1.42 g, 84%), a portion of which was recrystallized to afford the analytical sample, m.p. 413–444 K (with extended and continual decomposition); [α]_D²⁰ +8.2 (15 min.) (c, 0.79 in 9:1 H₂O: HOAc). ¹H NMR (D₂O, 400 MHz, reference Me₃COH at δ_H 1.24): δ_H 5.17 (d, J_1,2 = 1.5 Hz, H-1 of α-pyranose), 4.89 (d, J_1,2 = 0.8 Hz, H-1 of β-pyranose); signals for the major acyclic sulfonate: δ_H 4.64 (s, H-1), 4.20 (d, J_2,3 = 9.5 Hz, H-2); for the minor acyclic sulfonate: δ_H 4.64 (d, J_1,2 = 5.2 Hz, H-1), 4.07 (d, J_2,3 = 7.8 Hz, H-2); ratio of major to minor sulfonate = 8.3:1. ¹³C NMR (D₂O, 100 MHz, reference Me₃COH at δ_C 30.29): δ_C 94.70 (C1, α-pyranose), 94.31 (C1, β-pyranose); signals for the major acyclic sulfonate: δ_C 82.34 (C1), 71.48, 69.46, 69.18*, 68.91* (C2, C3, C4, C5), 63.96 (C6); the minor acyclic sulfonate showed a peak at δ_C 84.43 (C1). Each of the signals marked with * is the average value of two closely spaced singlets of equal intensity separated by 4 Hz. The reasons for these small separations in the proton decoupled ¹³C spectrum are not clear.

Integration of the various signals for H-1 in the ¹H NMR spectrum indicated that the species α-pyranose, β-pyranose, major acyclic sulfonate and minor acyclic sulfonate were present in the % ratios of 25.24: 13.14: 55.00: 6.62, respectively. In the ¹³C NMR spectrum, based on peak heights, the corresponding ratios were: 32.73: 15.00: 48.63: 3.64.

HRESMS (negative ion mode, measured in an H₂O/MeOH, solution) gave a base peak at m/z 261.0287 ([C₆H₁₃O₉S₁]⁻), and a significant peak at 243.0182 ([C₆H₁₃O₉S₁–H₂O]⁻).

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 3. All the hydrogen atoms were located in difference maps and were refined with isotropic thermal parameters; the hydroxyl hydrogen atoms were refined with constrained O—H distances.

Table 3
Experimental details

Crystal data
Chemical formula	Na⁺·C₆H₁₃NaO₉S⁻
M_r	284.21
Crystal system, space group	Monoclinic, P2₁
Temperature (K)	140
a, b, c (Å)	4.8744 (2), 5.0042 (2), 21.0759 (10)
β (°)	93.867 (4)
V (Å³)	512.92 (4)
Z	2
Radiation type	Mo Kα
μ (mm⁻¹)	0.40
Crystal size (mm)	0.52 × 0.20 × 0.04

Data collection
Diffractometer	Oxford Diffraction Xcalibur 3/Sapphire3 CCD
Absorption correction	Multi-scan (CrysAlis PRO; Agilent, 2014 )
T_min, T_max	0.618, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	9424, 2972, 2926
R_int	0.030
(sin θ/λ)_max (Å⁻¹)	0.703

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.039, 0.093, 1.16
No. of reflections	2972
No. of parameters	206
No. of restraints	7
H-atom treatment	All H-atom parameters refined
Δρ_max, Δρ_min (e Å⁻³)	0.49, −0.45
Absolute structure	Flack x determined using 1240 quotients [(I⁺)−(I⁻)]/[(I⁺)+(I⁻)] (Parsons et al., 2013 )
Absolute structure parameter	0.04 (4)
Computer programs: CrysAlis PRO (Agilent, 2014), SHELXT (Sheldrick, 2015a ), SHELXL2014/7 (Sheldrick, 2015b ), ORTEP (Johnson, 1976 ) and ORTEP-3 for Windows and WinGX (Farrugia, 2012 ).

Supporting information

CCDC reference: 1862155

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989018011556/hb7768sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989018011556/hb7768Isup2.hkl

checkCIF report

Computing details top

Data collection: CrysAlis PRO (Agilent, 2014); cell refinement: CrysAlis PRO (Agilent, 2014); data reduction: CrysAlis PRO (Agilent, 2014); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2014/7 (Sheldrick, 2015b); molecular graphics: ORTEP (Johnson, 1976) and ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL2014/7 (Sheldrick, 2015b) and WinGX (Farrugia, 2012).

Sodium (1S,2S,3S,4R,5R)-1,2,3,4,5,6-\ hexahydroxyhexane-1-sulfonate top

Crystal data top

Na⁺·C₆H₁₃NaO₉S⁻	F(000) = 296
M_r = 284.21	D_x = 1.840 Mg m⁻³
Monoclinic, P2₁	Mo Kα radiation, λ = 0.71073 Å
a = 4.8744 (2) Å	Cell parameters from 4715 reflections
b = 5.0042 (2) Å	θ = 3.9–32.5°
c = 21.0759 (10) Å	µ = 0.40 mm⁻¹
β = 93.867 (4)°	T = 140 K
V = 512.92 (4) Å³	Plate, colourless
Z = 2	0.52 × 0.20 × 0.04 mm

Data collection top

Oxford Diffraction Xcalibur 3/Sapphire3 CCD diffractometer	2972 independent reflections
Radiation source: Enhance (Mo) X-ray Source	2926 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.030
Detector resolution: 16.0050 pixels mm^-1	θ_max = 30.0°, θ_min = 3.9°
Thin slice φ and ω scans	h = −6→6
Absorption correction: multi-scan (CrysAlis PRO; Agilent, 2014)	k = −7→7
T_min = 0.618, T_max = 1.000	l = −29→29
9424 measured reflections

Refinement top

Refinement on F²	Hydrogen site location: difference Fourier map
Least-squares matrix: full	All H-atom parameters refined
R[F² > 2σ(F²)] = 0.039	w = 1/[σ²(F_o²) + (0.0295P)² + 0.694P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.093	(Δ/σ)_max < 0.001
S = 1.16	Δρ_max = 0.49 e Å⁻³
2972 reflections	Δρ_min = −0.44 e Å⁻³
206 parameters	Absolute structure: Flack x determined using 1240 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013)
7 restraints	Absolute structure parameter: 0.04 (4)
Primary atom site location: dual

Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
C1	0.5658 (7)	0.4844 (7)	0.83763 (16)	0.0099 (6)
O1	0.4257 (5)	0.2507 (5)	0.85501 (12)	0.0124 (5)
C2	0.7379 (7)	0.4250 (7)	0.78081 (16)	0.0092 (6)
O2	0.9236 (5)	0.2083 (5)	0.79422 (12)	0.0112 (5)
C3	0.5507 (7)	0.3570 (7)	0.72169 (16)	0.0103 (6)
O3	0.3628 (5)	0.5738 (6)	0.70848 (11)	0.0124 (5)
C4	0.7176 (7)	0.2973 (7)	0.66432 (16)	0.0106 (6)
O4	0.8619 (5)	0.5330 (5)	0.64719 (12)	0.0132 (5)
C5	0.5343 (7)	0.2160 (7)	0.60581 (16)	0.0121 (6)
O5	0.3884 (5)	−0.0177 (5)	0.62226 (13)	0.0149 (5)
C6	0.6989 (8)	0.1565 (7)	0.54832 (17)	0.0142 (7)
O6	0.8875 (5)	−0.0609 (5)	0.55969 (13)	0.0150 (5)
S1	0.77100 (15)	0.60171 (15)	0.90636 (4)	0.00914 (16)
O11	0.5782 (5)	0.7211 (6)	0.94817 (12)	0.0139 (5)
O12	0.9110 (5)	0.3741 (5)	0.93700 (12)	0.0142 (5)
O13	0.9575 (5)	0.7966 (5)	0.88046 (12)	0.0125 (5)
Na	0.2652 (3)	0.0627 (3)	0.94976 (6)	0.0129 (3)
H1	0.436 (10)	0.615 (13)	0.825 (2)	0.024 (13)*
H2	0.832 (11)	0.605 (16)	0.776 (3)	0.037 (15)*
H3	0.412 (9)	0.198 (9)	0.732 (2)	0.007 (10)*
H4	0.839 (8)	0.167 (8)	0.6749 (19)	0.002 (9)*
H5	0.377 (10)	0.363 (11)	0.595 (2)	0.020 (13)*
H61	0.800 (9)	0.326 (9)	0.5382 (19)	0.004 (10)*
H62	0.588 (9)	0.122 (11)	0.511 (2)	0.015 (11)*
H1O	0.281 (8)	0.275 (15)	0.834 (3)	0.045 (18)*
H2O	0.857 (10)	0.118 (11)	0.821 (2)	0.025 (13)*
H3O	0.458 (14)	0.672 (14)	0.689 (3)	0.08 (3)*
H4O	1.016 (7)	0.543 (16)	0.666 (3)	0.05 (2)*
H5O	0.246 (8)	−0.013 (12)	0.601 (2)	0.037 (17)*
H6O	0.829 (11)	−0.166 (10)	0.585 (2)	0.033 (16)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0066 (14)	0.0104 (15)	0.0125 (15)	−0.0002 (11)	−0.0005 (11)	0.0021 (11)
O1	0.0092 (11)	0.0132 (12)	0.0146 (12)	−0.0038 (9)	0.0000 (9)	0.0016 (9)
C2	0.0068 (13)	0.0078 (14)	0.0130 (14)	−0.0009 (11)	−0.0001 (11)	0.0005 (11)
O2	0.0077 (11)	0.0113 (11)	0.0145 (11)	0.0026 (9)	−0.0005 (9)	0.0014 (9)
C3	0.0094 (14)	0.0106 (15)	0.0108 (14)	−0.0007 (11)	−0.0013 (11)	−0.0001 (11)
O3	0.0094 (10)	0.0124 (12)	0.0152 (11)	0.0009 (10)	−0.0010 (8)	0.0033 (10)
C4	0.0090 (14)	0.0105 (15)	0.0122 (14)	0.0013 (12)	0.0005 (11)	0.0017 (11)
O4	0.0086 (11)	0.0134 (12)	0.0173 (12)	−0.0033 (9)	−0.0019 (9)	0.0022 (9)
C5	0.0120 (15)	0.0113 (15)	0.0129 (15)	−0.0011 (12)	−0.0006 (12)	0.0012 (12)
O5	0.0117 (12)	0.0154 (13)	0.0171 (12)	−0.0043 (10)	−0.0023 (9)	0.0032 (10)
C6	0.0164 (16)	0.0139 (18)	0.0118 (14)	0.0017 (12)	−0.0016 (12)	0.0001 (11)
O6	0.0133 (12)	0.0151 (14)	0.0167 (13)	0.0004 (10)	0.0024 (9)	0.0002 (10)
S1	0.0081 (3)	0.0080 (3)	0.0112 (3)	0.0010 (3)	−0.0003 (2)	−0.0002 (3)
O11	0.0138 (12)	0.0150 (12)	0.0128 (11)	0.0059 (10)	0.0007 (9)	−0.0018 (10)
O12	0.0150 (12)	0.0093 (11)	0.0176 (12)	0.0038 (9)	−0.0033 (9)	0.0012 (9)
O13	0.0104 (11)	0.0100 (11)	0.0171 (12)	−0.0031 (9)	−0.0002 (9)	0.0000 (9)
Na	0.0122 (6)	0.0123 (7)	0.0138 (6)	0.0036 (5)	−0.0006 (5)	−0.0009 (5)

Geometric parameters (Å, º) top

Na—O11ⁱ	2.293 (3)	O4—H4O	0.82 (3)
Na—O12ⁱⁱ	2.328 (3)	C5—O5	1.424 (4)
Na—O11ⁱⁱⁱ	2.370 (3)	C5—C6	1.527 (5)
Na—O1	2.386 (3)	C5—H5	1.08 (5)
Na—O13^iv	2.421 (3)	O5—H5O	0.80 (3)
Na—O12ⁱⁱⁱ	2.757 (3)	C6—O6	1.434 (4)
C1—O1	1.415 (4)	C6—H61	1.01 (4)
C1—C2	1.537 (5)	C6—H62	0.94 (4)
C1—S1	1.802 (3)	O6—H6O	0.81 (3)
C1—H1	0.94 (6)	S1—O12	1.456 (3)
O1—Na	2.386 (3)	S1—O11	1.459 (3)
O1—H1O	0.81 (3)	S1—O13	1.464 (3)
C2—O2	1.429 (4)	S1—Na^v	3.0557 (16)
C2—C3	1.532 (4)	O11—Na^vi	2.293 (3)
C2—H2	1.02 (8)	O11—Na^v	2.370 (3)
O2—H2O	0.81 (3)	O12—Na^vii	2.328 (3)
C3—O3	1.435 (4)	O12—Na^v	2.757 (3)
C3—C4	1.532 (5)	O13—Na^viii	2.421 (3)
C3—H3	1.08 (4)	Na—S1ⁱⁱⁱ	3.0557 (16)
O3—H3O	0.81 (3)	Na—Na^v	3.915 (2)
C4—O4	1.432 (4)	Na—Naⁱⁱⁱ	3.915 (2)
C4—C5	1.529 (5)	Na—H1O	2.66 (6)
C4—H4	0.90 (4)

O1—C1—C2	109.9 (3)	C1—S1—Na^v	135.30 (11)
O1—C1—S1	108.2 (2)	S1—O11—Na^vi	140.39 (16)
C2—C1—S1	112.8 (2)	S1—O11—Na^v	103.31 (14)
O1—C1—H1	109 (3)	Na^vi—O11—Na^v	114.20 (11)
C2—C1—H1	109 (3)	S1—O12—Na^vii	153.71 (18)
S1—C1—H1	109 (3)	S1—O12—Na^v	87.25 (12)
C1—O1—Na	137.2 (2)	Na^vii—O12—Na^v	113.65 (10)
C1—O1—H1O	99 (5)	S1—O13—Na^viii	121.11 (15)
Na—O1—H1O	101 (5)	O11ⁱ—Na—O12ⁱⁱ	170.53 (12)
O2—C2—C3	109.1 (3)	O11ⁱ—Na—O11ⁱⁱⁱ	95.09 (8)
O2—C2—C1	111.4 (3)	O12ⁱⁱ—Na—O11ⁱⁱⁱ	94.13 (11)
C3—C2—C1	110.5 (3)	O11ⁱ—Na—O1	91.47 (10)
O2—C2—H2	114 (3)	O12ⁱⁱ—Na—O1	85.52 (10)
C3—C2—H2	111 (3)	O11ⁱⁱⁱ—Na—O1	121.61 (11)
C1—C2—H2	101 (3)	O11ⁱ—Na—O13^iv	88.09 (10)
C2—O2—H2O	106 (4)	O12ⁱⁱ—Na—O13^iv	82.76 (10)
O3—C3—C4	111.1 (3)	O11ⁱⁱⁱ—Na—O13^iv	151.65 (11)
O3—C3—C2	109.1 (3)	O1—Na—O13^iv	86.37 (10)
C4—C3—C2	111.5 (3)	O11ⁱ—Na—O12ⁱⁱⁱ	90.22 (10)
O3—C3—H3	101 (2)	O12ⁱⁱ—Na—O12ⁱⁱⁱ	93.28 (8)
C4—C3—H3	113 (2)	O11ⁱⁱⁱ—Na—O12ⁱⁱⁱ	55.17 (9)
C2—C3—H3	111 (2)	O1—Na—O12ⁱⁱⁱ	176.51 (11)
C3—O3—H3O	100 (6)	O13^iv—Na—O12ⁱⁱⁱ	96.74 (10)
O4—C4—C5	106.6 (3)	O11ⁱ—Na—S1ⁱⁱⁱ	98.35 (8)
O4—C4—C3	109.5 (3)	O12ⁱⁱ—Na—S1ⁱⁱⁱ	88.84 (8)
C5—C4—C3	112.1 (3)	O11ⁱⁱⁱ—Na—S1ⁱⁱⁱ	27.68 (7)
O4—C4—H4	109 (3)	O1—Na—S1ⁱⁱⁱ	148.15 (9)
C5—C4—H4	110 (3)	O13^iv—Na—S1ⁱⁱⁱ	123.98 (8)
C3—C4—H4	109 (3)	O12ⁱⁱⁱ—Na—S1ⁱⁱⁱ	28.43 (6)
C4—O4—H4O	112 (5)	O11ⁱ—Na—Na^v	96.85 (9)
O5—C5—C6	109.3 (3)	O12ⁱⁱ—Na—Na^v	92.10 (7)
O5—C5—C4	107.3 (3)	O11ⁱⁱⁱ—Na—Na^v	32.29 (7)
C6—C5—C4	112.5 (3)	O1—Na—Na^v	89.32 (8)
O5—C5—H5	105 (3)	O13^iv—Na—Na^v	173.53 (8)
C6—C5—H5	112 (3)	O12ⁱⁱⁱ—Na—Na^v	87.45 (8)
C4—C5—H5	111 (3)	S1ⁱⁱⁱ—Na—Na^v	59.55 (4)
C5—O5—H5O	105 (4)	O11ⁱ—Na—Naⁱⁱⁱ	33.52 (6)
O6—C6—C5	112.4 (3)	O12ⁱⁱ—Na—Naⁱⁱⁱ	153.15 (10)
O6—C6—H61	111 (2)	O11ⁱⁱⁱ—Na—Naⁱⁱⁱ	65.29 (9)
C5—C6—H61	107 (2)	O1—Na—Naⁱⁱⁱ	119.46 (9)
O6—C6—H62	109 (3)	O13^iv—Na—Naⁱⁱⁱ	106.89 (7)
C5—C6—H62	114 (3)	O12ⁱⁱⁱ—Na—Naⁱⁱⁱ	61.18 (7)
H61—C6—H62	104 (4)	S1ⁱⁱⁱ—Na—Naⁱⁱⁱ	64.84 (4)
C6—O6—H6O	111 (4)	Na^v—Na—Naⁱⁱⁱ	79.45 (5)
O12—S1—O11	110.74 (16)	O11ⁱ—Na—H1O	102.9 (13)
O12—S1—O13	113.71 (16)	O12ⁱⁱ—Na—H1O	72.2 (12)
O11—S1—O13	113.22 (16)	O11ⁱⁱⁱ—Na—H1O	132.0 (16)
O12—S1—C1	108.65 (16)	O1—Na—H1O	17.4 (8)
O11—S1—C1	105.88 (16)	O13^iv—Na—H1O	74.0 (14)
O13—S1—C1	104.03 (15)	O12ⁱⁱⁱ—Na—H1O	163.4 (9)
O12—S1—Na^v	64.32 (11)	S1ⁱⁱⁱ—Na—H1O	152.7 (17)
O11—S1—Na^v	49.00 (11)	Na^v—Na—H1O	100.8 (14)
O13—S1—Na^v	119.44 (11)	Naⁱⁱⁱ—Na—H1O	134.2 (11)

C2—C1—O1—Na	150.0 (2)	C2—C1—S1—O11	163.8 (2)
S1—C1—O1—Na	26.4 (4)	O1—C1—S1—O13	166.0 (2)
O1—C1—C2—O2	−55.8 (3)	C2—C1—S1—O13	44.2 (3)
S1—C1—C2—O2	65.0 (3)	O1—C1—S1—Na^v	−27.4 (3)
O1—C1—C2—C3	65.6 (3)	C2—C1—S1—Na^v	−149.19 (18)
S1—C1—C2—C3	−173.6 (2)	O12—S1—O11—Na^vi	−179.4 (2)
O2—C2—C3—O3	179.6 (3)	O13—S1—O11—Na^vi	51.6 (3)
C1—C2—C3—O3	56.8 (3)	C1—S1—O11—Na^vi	−61.8 (3)
O2—C2—C3—C4	−57.3 (3)	Na^v—S1—O11—Na^vi	161.2 (3)
C1—C2—C3—C4	179.9 (3)	O12—S1—O11—Na^v	19.44 (19)
O3—C3—C4—O4	57.3 (3)	O13—S1—O11—Na^v	−109.62 (15)
C2—C3—C4—O4	−64.6 (3)	C1—S1—O11—Na^v	137.03 (14)
O3—C3—C4—C5	−60.8 (4)	O11—S1—O12—Na^vii	−160.2 (4)
C2—C3—C4—C5	177.2 (3)	O13—S1—O12—Na^vii	−31.4 (4)
O4—C4—C5—O5	−179.7 (3)	C1—S1—O12—Na^vii	83.9 (4)
C3—C4—C5—O5	−59.9 (4)	Na^v—S1—O12—Na^vii	−144.0 (4)
O4—C4—C5—C6	60.0 (4)	O11—S1—O12—Na^v	−16.19 (16)
C3—C4—C5—C6	179.9 (3)	O13—S1—O12—Na^v	112.62 (14)
O5—C5—C6—O6	−57.8 (4)	C1—S1—O12—Na^v	−132.07 (12)
C4—C5—C6—O6	61.2 (4)	O12—S1—O13—Na^viii	−67.7 (2)
O1—C1—S1—O12	44.6 (3)	O11—S1—O13—Na^viii	59.9 (2)
C2—C1—S1—O12	−77.2 (3)	C1—S1—O13—Na^viii	174.31 (16)
O1—C1—S1—O11	−74.4 (3)	Na^v—S1—O13—Na^viii	5.1 (2)

Symmetry codes: (i) x, y−1, z; (ii) x−1, y, z; (iii) −x+1, y−1/2, −z+2; (iv) x−1, y−1, z; (v) −x+1, y+1/2, −z+2; (vi) x, y+1, z; (vii) x+1, y, z; (viii) x+1, y+1, z.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1O···O2ⁱⁱ	0.81 (3)	1.92 (4)	2.693 (4)	160 (8)
O2—H2O···O1	0.81 (3)	2.36 (5)	2.828 (3)	118 (5)
O2—H2O···O13ⁱ	0.81 (3)	2.08 (4)	2.745 (4)	140 (5)
O3—H3O···O4	0.81 (3)	2.32 (7)	2.838 (3)	123 (7)
O3—H3O···O5^vi	0.81 (3)	2.11 (6)	2.743 (4)	136 (7)
O4—H4O···O3^vii	0.82 (3)	1.87 (3)	2.692 (3)	179 (8)
O5—H5O···O6ⁱⁱ	0.80 (3)	1.91 (3)	2.704 (4)	169 (6)
O6—H6O···O4ⁱ	0.81 (3)	2.00 (4)	2.753 (4)	154 (6)
O6—H6O···O5	0.81 (3)	2.45 (6)	2.853 (4)	112 (5)

Symmetry codes: (i) x, y−1, z; (ii) x−1, y, z; (vi) x, y+1, z; (vii) x+1, y, z.

Acknowledgements

We thank the EPSRC UK National Mass Spectrometry Facility (NMSF) at Swansea University for determination of the low and high resolution mass spectra, Dr Sergey Nepogodiev of the John Innes Centre, Norwich and Dr Ryan Tinson of the University of East Anglia for measurement of the NMR spectra, and Dr James Orton of the UK National Crystallographic Service for preliminary measurements.

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