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Comparison of the C—H⋯O bonding in two crystalline phases of 1,4-di­thiane 1,1,4,4-tetra­oxide

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a838 Grooms Rd, Rexford, NY 12148, USA, bDept. of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA, cDuPont Experimental Station E500.com, 200 Powder Mill Road, PO Box 8352, Wilmington, DE 19803, USA, and d2 Baydons Lane, Chippenham SN15 3JX, UK
*Correspondence e-mail: r.harlow.whereareyou@gmail.com

Edited by J. Jasinski, Keene State College, USA (Received 28 March 2019; accepted 1 April 2019; online 5 April 2019)

The crystal structures of two crystalline phases of 1,4-di­thiane 1,1,4,4-tetra­oxide, C4H8O4S2, have been determined in order to examine the nature of possible inter­molecular hydrogen bonds. Phase 1 is monoclinic, space group C2/m, with unit-cell dimensions of a = 9.073 (8), b = 7.077 (6), c = 5.597 (5) Å and β = 105.89 (1)°. The mol­ecule adopts 2/m symmetry and all of the mol­ecules are related by translation and thus have the same orientation. Phase 2 is also monoclinic but in space group P21/n with unit-cell dimensions of a = 7.1305 (5), b = 5.7245 (4), c = 8.3760 (6) Å and β = 91.138 (2)°. In this phase, the mol­ecule sits on an inversion center and the mol­ecules within the unit cell adopt quite different orientations. In both phases, examination of the potential C—H⋯O hydrogen bonds around each of the independent oxygen atoms (one axial and the other equatorial) shows the general O⋯H patterns to be quite similar with each oxygen atom in contact with four neighboring H atoms, and each H atom contacting two neighboring O atoms. While none of the H⋯O contacts is particularly short (all are greater than 2.5 Å), each mol­ecule has 32 such contacts that form an extensive inter­molecular network. A 1H NMR spectrum of the compound dissolved in DMSO shows a singlet of 8H at δ 3.677 which indicates that the C—H bonds are only moderately polarized by the single adjacent –SO2– moiety: strongly polarized C—H bonds have δ values in the 5–6 range [Li & Sammes (1983[Li, C. & Sammes, M. P. (1983). J. Chem. Soc. Perkin Trans. 1, pp. 1303-1309.]). J. Chem. Soc. Perkin Trans. 1, pp. 1303–1309]. The phase 1 crystal studied was non-merohedrally twinned.

1. Chemical context

Some years ago, multiple studies of C—H⋯X (X = N, O) intramol­ecular hydrogen bonds were carried out on a series of 1,3-di­thiane 1,1,3,3-tetra­oxides which had various substituents at the 2 position located between the two SO2 groups. The remaining C—H bond in the 2 position is strongly polarized given the electron-withdrawing properties of the two adjacent sulfone groups. The substituents bonded at the 2 position contained nitro­gen or oxygen electron-pair donors which, with proper chain lengths, were able to form an intra­molecular hydrogen bond to the polar hydrogen atom.

[Scheme 2]

The chemistry and NMR/IR spectroscopic information of a wide variety of compounds were reported in a number of papers (see Li & Sammes, 1983[Li, C. & Sammes, M. P. (1983). J. Chem. Soc. Perkin Trans. 1, pp. 1303-1309.], and references therein). Focusing on those compounds with significant shifts of the polar methine hydrogen in the 1H-NMR spectra, their crystal structure determinations clearly demonstrated the formation of intramol­ecular hydrogen bonds (Harlow et al., 1984[Harlow, R. L., Li, C. & Sammes, M. P. (1984). J. Chem. Soc., Perkin Trans. I, 547-551.]). Never explored, however, was the nature of the C—H⋯O inter­actions likely to be found in the unsubstituted compound itself. As a matter of curiosity, we consequently decided to undertake the crystal structure determinations of the two possible (1,3- and 1,4-) di­thiane tetra­oxides and the unique 1,3,5-tri­thiane hexa­oxide. All three of the compounds have unusually high melting/decomposition temperatures and we wanted to explore and compare the nature of the intermol­ecular C—H⋯O inter­actions in this group of uncomplicated compounds. As a start on this project, we report herein the completion of the structures of two crystalline phases of 1,4-di­thiane 1,1,4,4-tetra­oxide, a compound which has no dipole moment, has the same 1:2 O:H ratio as water, and decomposes above 627 K.

[Scheme 1]

2. Structural commentary

1,4-Di­thiane 1,1,4,4-tetra­oxide contains two crystalline phases as determined from an X-ray diffraction pattern of the as-synthesized powder. When sublimed, crystals of both phases were also produced and it was only by chance that the two laboratories involved picked different phases. Fig. 1[link] compares the mol­ecular ORTEP drawings of the mol­ecules in the two phases. The mol­ecule in phase 1 adopts 2/m symmetry while in phase 2 the mol­ecule sits on a center of symmetry. The intra­molecular bond distances and angles for the two phases are comparable.

[Figure 1]
Figure 1
ORTEP drawings (50% probability) of the 1,4-di­thiane 1,1,4,4-tetra­oxide mol­ecule in crystalline phases 1 and 2. The mol­ecule in phase 1 has 2/m symmetry; in phase 2, it has a center of inversion. All of the unique atoms are labeled as are the symmetry-related carbon atoms to emphasize the different symmetries. Symmetry codes for phase 1: (a) x, 1 − y, z; (b) 1 − x, y, −z; (c) 1 − x, 1 − y, −z. Symmetry code for phase 2: (a) −x, −y, 1 − z.

3. Supra­molecular features

Packing diagrams (Fig. 2[link]) reveal that the packing for the two forms is quite different. In phase 1, all of the mol­ecules are related by simple translational symmetries and thus all the mol­ecules have the same orientation. In phase 2, the mol­ecules have two different orientations in a somewhat herringbone fashion. Thus, one might expect any C—H⋯O contacts to be quite different for the two phases but, in fact, they are very similar. Figs. 3[link] and 4[link] compare the environments of O1 (equatorial oxygen atom) and O2 (axial oxygen atom). In all cases, each oxygen atom is in contact with four hydrogen atoms arranged in a distorted square. Probably for steric reasons, the distortion is less for the equatorial oxygen atom than for the axial oxygen atom.

[Figure 2]
Figure 2
Packing diagrams for crystalline phase 1 as viewed nearly along the c axis and phase 2 as viewed nearly along the a-axis. In phase 1, all the mol­ecules are related by translation and thus have the same orientation. In phase 2, the mol­ecules have two different orientations.
[Figure 3]
Figure 3
Environment of the equatorial oxygen atom, O1, in phases 1 and 2. Although the packing of the mol­ecules is quite different, the arrangement of the C—H⋯O contacts in both phases is seen to be very similar.
[Figure 4]
Figure 4
Environment of the axial oxygen atom, O2, in phases 1 and 2. In this case, the environments are still similar, but less so than for equatorial O1.

Each oxygen atom in both phases `sees' four hydrogen atoms while each hydrogen atom `sees' two oxygen atoms. This bifurcation of the hydrogen contacts means that none of the H⋯O distances is particularly short. It should also be pointed out that each methyl­ene group has only one neighboring sulfone group, which would limit the polarization of the C—H bonds compared to our previous studies where the C—H bond of inter­est sat between two sulfone groups. Thus, very short C—H⋯O bonds were not expected. The exact details of the C—H⋯O contacts are given in Table 1[link]. Thus, while there are no really short C—H⋯O contacts (none less than 2.50 Å), every donor and every acceptor plays a role in forming a extensive network of contacts in which each mol­ecule has a total of 32 inter­actions with its neighbors.

Table 1
Inter­molecular contacts (Å, °) as potential C⋯H⋯O hydrogen bonds for phases 1 and 2

Atoms bondH⋯O angleC—H⋯O angleS—O⋯H
Phase 1      
C1—H1A⋯O1i 2.63 (2) 148 (2) 123 (2)
C1—H1B⋯O1ii 2.59 (2) 157 (2) 127 (2)
       
C1—H1A⋯O2iii 2.67 (2) 112 (2) 114 (2)
C1—H1B⋯O2iv 2.81 (2) 122 (2) 145 (2)
       
Phase 2      
C1—H1A⋯O1i 2.60 (2) 151 (1) 123 (1)
C1—H1B⋯O1ii 2.54 (2) 160 (1) 127 (1)
C2—H2A⋯O1i 2.69 (2) 149 (1) 122 (1)
C2—H2B⋯O1iii 2.50 (2) 155 (1) 129 (1)
       
C1—H1A⋯O2iv 2.70 (2) 110 (1) 111 (1)
C1—H1B⋯O2v 2.69 (2) 122 (1) 140 (1)
C2—H2A⋯O2vi 2.77 (2) 100 (1) 127 (1)
C2—H2B⋯O2vii 2.68 (2) 125 (1) 144 (1)
Symmetry codes for phase 1: (i) 1 − x, y, 1 − z; (ii) [{3\over 2}] − x, −[{1\over 2}] + y, 1 − z; (iii) −[{1\over 2}] + x, −[{1\over 2}] + y, z; (iv) [{3\over 2}] − x, −[{1\over 2}] + y, −z. Symmetry codes for phase 2: (i) [{1\over 2}] − x, −[{1\over 2}] + y, [{3\over 2}] − z; (ii) 1 − x, −y, 1 − z; (iii) [{1\over 2}] − x, [{1\over 2}] + y, [{3\over 2}] − z; (iv) x, −1 + y, z; (v) [{1\over 2}] − x, −[{1\over 2}] + y, [{1\over 2}] − z; (vi) −[{1\over 2}] + x, [{1\over 2}] − y, [{1\over 2}] + z; (vii) −x, 1 − y, 1 − z.

The shortest C—H⋯O contacts tend to be between the equatorial oxygen atoms, O1, and the equatorial hydrogen atoms labeled with the suffix B. These also come with C—H⋯O angles that are closest to being linear, 148 to 160°. Presumably the difference between axial and equatorial H⋯O contacts is mostly due to steric effects, the equatorial atoms being more accessible. The shorter contacts can undoubtedly be classified as true C—H⋯O hydrogen bonds using, as a guide, the seminal study of weak hydrogen bonds by Desiraju & Steiner (1999[Desiraju, G. R. & Steiner, T. (1999). The Weak Hydrogen Bond in Structural Chemistry and Biology, Oxford University Press.]). The remaining bonds are probably better described as mostly electrostatic in nature. However, as Desiraju & Steiner point out, there are no hard limits for determining what may, and may not, be a true hydrogen bond.

4. Database survey

A Cambridge Crystallographic Database survey of 1,4-di­thiane reveals over 200 structures with that base motif (CSD v. 5.40 + 1 update; Groom et al., 2016[Groom, C. R., Bruno, I. J., Lightfoot, M. P. & Ward, S. C. (2016). Acta Cryst. B72, 171-179.]). A more modest survey, with one oxygen bonded to each sulfur yields 33 results, of which 1,4-di­thiane 1,4-dioxide has two polymorphs [DTHDOX and DTHDOX01 (Shearer, 1959[Shearer, H. M. M. (1959). J. Chem. Soc. pp. 1394-1397.]; Takemura et al., 2014[Takemura, A., McAllister, L. J., Karadakov, P. B., Pridmore, N. E., Whitwood, A. C. & Bruce, D. W. (2014). CrystEngComm, 16, 4254-4264.]) and DTHDSX (Montgomery, 1960[Montgomery, H. (1960). Acta Cryst. 13, 381-384.])]. There is only one reported structure that incorporates 1,4-di­thiane 1,1,4,4-tetra­oxide into its structure, viz. 5,6,7-triphenyl-2,3-di­hydro-6H-phospholo[3,4-b][1,4]dithiine 1,1,4,4,6-penta­oxide (GACCUK; Fadhel et al., 2010[Fadhel, O., Benkö, Z., Gras, M., Deborde, V., Joly, D., Lescop, C., Nyulászi, L., Hissler, M. & Réau, R. (2010). Chem. Eur. J. 16, 11340-11356.]). One of the five oxygen atoms is located on the phospho­rus, while the remaining four are on the sulfur atoms of the sulfone moiety.

5. Synthesis and crystallization

Following literature procedures (Schultz et al., 1963[Schultz, H. S., Freyermuth, H. B. & Buc, S. R. (1963). J. Org. Chem. 28, 1140-1142.]), a 100 mL round-bottom flask was charged with 1,4-thiane (Sigma–Aldrich; 1.005 g, 8.4 mmol) in 25 mL glacial acetic acid. To this were added 10 mL 30% hydrogen peroxide solution (excess) in 25 mL of glacial acetic acid. The solution was heated to 323 K for 12 h under stirring over an oil bath. The white solid that formed was filtered and washed with water (3 × 25 mL) and diethyl ether (3 × 25 mL) (yield: 1.325 g, 86%). Crystals suitable for structural analysis were grown by sublimation of the solid. NMR data were recorded on a Bruker Avance 400 MHz with d6-DMSO as solvent, referenced to residue proteo-DMSO. TGA/DSC data showed decomposition occurring from 627 to 739 K.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2[link]. The refinement of phase 1 used two sets of reflections as the crystal was non-merohedrally twinned. Non-hydrogen atoms were refined with anisotropic atomic displacement parameters. All hydrogen atoms were refined freely.

Table 2
Experimental details

  Phase 1 Phase 2
Crystal data
Chemical formula C4H8O4S2 C4H8O4S2
Mr 184.22 184.22
Crystal system, space group Monoclinic, C2/m Monoclinic, P21/n
Temperature (K) 233 150
a, b, c (Å) 9.073 (8), 7.077 (6), 5.597 (5) 7.1308 (5), 5.7245 (4), 8.3760 (6)
β (°) 105.894 (10) 91.138 (2)
V3) 345.6 (5) 341.84 (4)
Z 2 2
Radiation type Mo Kα Synchrotron, λ = 0.7288 Å
μ (mm−1) 0.72 0.78
Crystal size (mm) 0.43 × 0.35 × 0.35 0.04 × 0.03 × 0.02
 
Data collection
Diffractometer APEXII CCD Bruker D8 Photon-2
Absorption correction Multi-scan (SADABS; Krause et al., 2015[Krause, L., Herbst-Irmer, R., Sheldrick, G. M. & Stalke, D. (2015). J. Appl. Cryst. 48, 3-10.]) Multi-scan (SADABS; Krause et al., 2015[Krause, L., Herbst-Irmer, R., Sheldrick, G. M. & Stalke, D. (2015). J. Appl. Cryst. 48, 3-10.])
Tmin, Tmax 0.747, 0.787 0.811, 0.862
No. of measured, independent and observed [I > 2σ(I)] reflections 433, 433, 428 14904, 1041, 957
Rint 0.036
(sin θ/λ)max−1) 0.652 0.714
 
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.023, 0.067, 1.19 0.028, 0.065, 1.11
No. of reflections 433 1041
No. of parameters 37 62
H-atom treatment All H-atom parameters refined All H-atom parameters refined
Δρmax, Δρmin (e Å−3) 0.32, −0.32 0.39, −0.44
Computer programs: APEX3 and SAINT (Bruker, 2016[Bruker (2016). APEX3 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]), SHELXL (Sheldrick, 2015[Sheldrick, G. M. (2015). Acta Cryst. C71, 3-8.]), OLEX2 (Dolomanov et al., 2009[Dolomanov, O. V., Bourhis, L. J., Gildea, R. J., Howard, J. A. K. & Puschmann, H. (2009). J. Appl. Cryst. 42, 339-341.]), CrystalMaker (Palmer, 2014[Palmer, D. C. (2014). CrystalMaker. CrystalMaker Software Ltd, Begbroke, England.]) and publCIF (Westrip, 2010[Westrip, S. P. (2010). J. Appl. Cryst. 43, 920-925.]).

Supporting information


Computing details top

For both structures, data collection: APEX3 (Bruker, 2016); cell refinement: SAINT (Bruker, 2016); data reduction: SAINT (Bruker, 2016); program(s) used to solve structure: OLEX2 (Dolomanov et al., 2009); program(s) used to refine structure: SHELXL (Sheldrick, 2015); molecular graphics: OLEX2 (Dolomanov et al., 2009), CrystalMaker (Palmer, 2014). Software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009) and publCIF (Westrip, 2010) for 14-disulphone-phase1; OLEX2 (Dolomanov et al., 2009) for 14-disulphone-phase2.

1,4-Dithiane 1,1,4,4-tetraoxide (14-disulphone-phase1) top
Crystal data top
C4H8O4S2F(000) = 192
Mr = 184.22Dx = 1.770 Mg m3
Monoclinic, C2/mMo Kα radiation, λ = 0.71073 Å
a = 9.073 (8) ÅCell parameters from 999 reflections
b = 7.077 (6) Åθ = 3.7–27.7°
c = 5.597 (5) ŵ = 0.72 mm1
β = 105.894 (10)°T = 233 K
V = 345.6 (5) Å3Irregular block, colorless
Z = 20.43 × 0.35 × 0.35 mm
Data collection top
APEXII CCD
diffractometer
428 reflections with I > 2σ(I)
θ/2θ scansθmax = 27.6°, θmin = 3.7°
Absorption correction: multi-scan
(SADABS; Krause et al., 2015)
h = 1111
Tmin = 0.747, Tmax = 0.787k = 09
433 measured reflectionsl = 07
433 independent reflections
Refinement top
Refinement on F2Primary atom site location: dual
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.023Hydrogen site location: difference Fourier map
wR(F2) = 0.067All H-atom parameters refined
S = 1.19 w = 1/[σ2(Fo2) + (0.0297P)2 + 0.2882P]
where P = (Fo2 + 2Fc2)/3
433 reflections(Δ/σ)max = 0.001
37 parametersΔρmax = 0.32 e Å3
0 restraintsΔρmin = 0.32 e Å3
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.

Refinement. Refined as a 2-component twin.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
S10.65320 (6)0.5000000.24835 (9)0.01721 (19)
O10.6955 (2)0.5000000.5165 (3)0.0273 (4)
O20.77466 (18)0.5000000.1266 (3)0.0258 (4)
C10.53198 (17)0.3028 (2)0.1408 (3)0.0198 (3)
H1A0.454 (2)0.305 (3)0.225 (4)0.024 (5)*
H1B0.590 (2)0.200 (3)0.192 (4)0.028 (5)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S10.0144 (3)0.0179 (3)0.0173 (3)0.0000.0010 (2)0.000
O10.0270 (8)0.0319 (10)0.0183 (8)0.0000.0017 (7)0.000
O20.0166 (8)0.0289 (9)0.0326 (9)0.0000.0080 (7)0.000
C10.0193 (7)0.0158 (7)0.0217 (8)0.0011 (5)0.0015 (6)0.0026 (6)
Geometric parameters (Å, º) top
S1—O11.444 (2)C1—C1ii1.523 (3)
S1—O21.4456 (19)C1—H1A0.949 (19)
S1—C11.7768 (19)C1—H1B0.90 (2)
S1—C1i1.7768 (19)
O1—S1—O2118.03 (11)S1—C1—H1A106.9 (12)
O1—S1—C1i108.42 (7)S1—C1—H1B105.9 (13)
O1—S1—C1108.42 (7)C1ii—C1—S1112.07 (9)
O2—S1—C1i108.74 (8)C1ii—C1—H1A113.1 (11)
O2—S1—C1108.74 (8)C1ii—C1—H1B110.6 (13)
C1—S1—C1i103.52 (12)H1A—C1—H1B108.0 (17)
O1—S1—C1—C1ii174.03 (12)C1i—S1—C1—C1ii59.03 (17)
O2—S1—C1—C1ii56.47 (15)
Symmetry codes: (i) x, y+1, z; (ii) x+1, y, z.
1,4-Dithiane 1,1,4,4-tetraoxide (14-disulphone-phase2) top
Crystal data top
C4H8O4S2F(000) = 192
Mr = 184.22Dx = 1.790 Mg m3
Monoclinic, P21/nSynchrotron radiation, λ = 0.7288 Å
a = 7.1308 (5) ÅCell parameters from 4318 reflections
b = 5.7245 (4) Åθ = 29.1–3.8°
c = 8.3760 (6) ŵ = 0.78 mm1
β = 91.138 (2)°T = 150 K
V = 341.84 (4) Å3Tablet, colorless
Z = 20.04 × 0.03 × 0.02 mm
Data collection top
Bruker D8 Photon-2
diffractometer
1041 independent reflections
Radiation source: synchrotron957 reflections with I > 2σ(I)
Detector resolution: 10.34 pixels mm-1Rint = 0.036
φ and ω scansθmax = 31.4°, θmin = 3.8°
Absorption correction: multi-scan
(SADABS; Krause et al., 2015)
h = 1010
Tmin = 0.811, Tmax = 0.862k = 88
14904 measured reflectionsl = 1111
Refinement top
Refinement on F2Primary atom site location: dual
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.028Hydrogen site location: difference Fourier map
wR(F2) = 0.065All H-atom parameters refined
S = 1.11 w = 1/[σ2(Fo2) + (0.0197P)2 + 0.3362P]
where P = (Fo2 + 2Fc2)/3
1041 reflections(Δ/σ)max = 0.001
62 parametersΔρmax = 0.39 e Å3
0 restraintsΔρmin = 0.44 e Å3
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
xyzUiso*/Ueq
S10.19891 (5)0.14315 (6)0.54564 (4)0.01294 (10)
O10.35411 (15)0.14742 (19)0.65934 (13)0.0194 (2)
O20.19584 (15)0.31562 (19)0.41982 (12)0.0186 (2)
C10.1857 (2)0.1390 (2)0.45787 (17)0.0149 (3)
C20.0137 (2)0.1639 (3)0.65211 (17)0.0147 (3)
H1A0.186 (3)0.247 (4)0.541 (2)0.024 (5)*
H1B0.299 (3)0.156 (3)0.401 (2)0.020 (5)*
H2A0.006 (3)0.049 (3)0.734 (2)0.016 (4)*
H2B0.008 (3)0.314 (4)0.696 (2)0.024 (5)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S10.01212 (16)0.01260 (16)0.01412 (17)0.00078 (11)0.00029 (11)0.00062 (12)
O10.0153 (5)0.0218 (5)0.0208 (5)0.0010 (4)0.0042 (4)0.0031 (4)
O20.0209 (5)0.0156 (5)0.0194 (5)0.0018 (4)0.0024 (4)0.0038 (4)
C10.0135 (6)0.0134 (6)0.0177 (6)0.0010 (5)0.0011 (5)0.0018 (5)
C20.0146 (6)0.0157 (6)0.0137 (6)0.0002 (5)0.0013 (5)0.0022 (5)
Geometric parameters (Å, º) top
S1—O11.4459 (11)C1—H1A0.93 (2)
S1—O21.4439 (11)C1—H1B0.95 (2)
S1—C11.7762 (14)C2—H2A0.952 (19)
S1—C21.7778 (14)C2—H2B0.94 (2)
C1—C2i1.5265 (19)
O1—S1—C1108.75 (7)C2i—C1—H1A112.1 (12)
O1—S1—C2108.51 (7)C2i—C1—H1B111.5 (11)
O2—S1—O1118.00 (7)H1A—C1—H1B108.6 (16)
O2—S1—C1108.65 (7)S1—C2—H2A106.2 (11)
O2—S1—C2108.65 (7)S1—C2—H2B103.3 (12)
C1—S1—C2103.29 (7)C1i—C2—S1111.98 (10)
S1—C1—H1A107.1 (13)C1i—C2—H2A113.8 (11)
S1—C1—H1B105.4 (12)C1i—C2—H2B110.6 (12)
C2i—C1—S1111.72 (10)H2A—C2—H2B110.4 (16)
Symmetry code: (i) x, y, z+1.
Intermolecular contacts (Å, °) as potential C···H···O hydrogen bonds for phases 1 and 2 top
Atomsbondangleangle
H···OC—H···OS—O···H
Phase 1
C1—H1A···O1i2.63 (2)148 (2)123 (2)
C1—H1B···O1ii2.59 (2)157 (2)127 (2)
C1—H1A···O2iii2.67 (2)112 (2)114 (2)
C1—H1B···O2iv2.81 (2)122 (2)145 (2)
Phase 2
C1—H1A···O1i2.60 (2)151 (1)123 (1)
C1—H1B···O1ii2.54 (2)160 (1)127 (1)
C2—H2A···O1i2.69 (2)149 (1)122 (1)
C2—H2B···O1iii2.50 (2)155 (1)129 (1)
C1—H1A···O2iv2.70 (2)110 (1)111 (1)
C1—H1B···O2v2.69 (2)122 (1)140 (1)
C2—H2A···O2vi2.77 (2)100 (1)127 (1)
C2—H2B···O2vii2.68 (2)125 (1)144 (1)
Symmetry codes for phase 1: (i) 1 - x, y, 1 - z; (ii) 3/2 - x, -1/2 + y, 1 - z; (iii) -1/2 + x, -1/2 + y, z; (iv) 3/2 - x, -1/2 + y, -z. Symmetry codes for phase 2: (i) 1/2 - x, -1/2 + y, 3/2 - z; (ii) 1 - x, -y, 1 - z; (iii) 1/2 - x, 1/2 + y, 3/2 - z; (iv) x, -1 + y, z; (v) 1/2 - x, -1/2 + y, 1/2 - z; (vi) -1/2 + x, 1/2 - y, 1/2 + z; (vii) -x, 1 - y, 1 - z.
 

Acknowledgements

A sample of phase 2 was submitted through the SCrALS (Service Crystallography at the Advance Light Source) program. Crystallographic data were collected at Beamline 11.3.1 at the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory. The ALs is supported by the US Department of Energy Sciences, under Contract DE-AC02–05CH11231. The R. Harlow Foundation for Disabused Crystallographers partially funded this research through a grant to the University of Notre Dame.

Funding information

Funding for this research was provided by: R. Harlow Foundation for Disabused Crystallographers (grant to University of Notre Dame, SCRALS).

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