organic compounds
of 2-methoxy-2-[(4-methylphenyl)sulfanyl]-1-phenylethan-1-one
aDepartmento de Química, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil, bInstituto de Química, Universidade de São Paulo, 05508-000 São Paulo, SP, Brazil, and cDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: julio@power.ufscar.br
In the title β-thiocarbonyl compound, C16H16O2S, the carbonyl and methoxy O atoms are approximately coplanar [O—C—C—O torsion angle = −18.2 (5)°] and syn to each other, and the tolyl ring is orientated to lie over them. The dihedral angle between the planes of the two rings is 44.03 (16)°. In the crystal, supramolecular chains are formed along the c axis mediated by C—H⋯O interactions involving methine and methyl H atoms as donors, with the carbonyl O atom accepting both bonds; these pack with no specific intermolecular interactions between them.
Keywords: crystal structure; β-thiocarbonyl; C—H⋯O interactions.
CCDC reference: 1035425
1. Related literature
For general background to β-thiocarbonyl and β-bis(thiocarbonyl) compounds, see: Vinhato et al. (2013); Zukerman-Schpector et al. (2008). For related structures, see: Olivato et al. (2013); Distefano et al. (1996). For further synthetic details, see: Ali & McDermott (2002); Zoretic & Soja (1976).
2. Experimental
2.1. Crystal data
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SIR (Burla et al., 2014; program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: MarvinSketch (ChemAxon, 2010) and publCIF (Westrip, 2010).
Supporting information
CCDC reference: 1035425
https://doi.org/10.1107/S205698901402550X/hg5421sup1.cif
contains datablocks I, New_Global_Publ_Block. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S205698901402550X/hg5421Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S205698901402550X/hg5421Isup3.cml
As part of our on-going research on the conformational and electronic interactions of some β-thio-carbonyl and β-bis-thio-carbonyl compounds, e.g. N,N-diethyl-2-[(4-substituted) phenylthio]acetamides, 1-methyl-3-phenylsulfonyl-2-piperidone, 3,3-bis[(4-substituted)phenylsulfanyl]-1-methyl-2-piperidones, 2-alkylthio-2-alkylsulfinyl-acetophenones, 2-alkylthio-2-phenylsulfonyl-acetophenones and 2-alkylsulfinyl-2-alkylsulfonyl-acetophenones, utilizing spectroscopic , theoretical and X-ray diffraction methods (Vinhato et al., 2013; Zukerman-Schpector et al., 2008; Olivato et al., 2013; Distefano et al., 1996) the title compound was synthesized and its determined.
4-Methylthiopenol (5.0 g, 40 mmol) was reacted with bromine (1.1 ml, 20 mmol) in dichloromethane (250 mL) on hydrated silica gel support (25 g of SiO2 and 12 mL of water) to give 4-methylphenyl disulfide (4.1 g, yield = 83%). A white solid was obtained after filtration and evaporation without further purification (Ali & McDermott, 2002). A solution of 2-methoxy acetophenone (0.4 mL, 2.76 mmol, Sigma-Aldrich) in THF (10 ml) was added drop wise to a cooled (195 K) solution of diisopropylamine (0.42 ml, 3.04 mmol) and butyllithium (2.0 ml, 2.76 mmol) in THF (10 ml). After 30 minutes, a solution of 4-methylphenyl disulfide (0.748 g, 3.04 mmol) with hexamethylphosphoramide (HMPA) (0.5 ml, 2.76 mmol) dissolved in THF (10 ml) was added drop wise to the enolate solution (Zoretic & Soja, 1976). After stirring for 3 h, water (50 ml) was added at room temperature and extraction with diethyl ether was performed. The organic layer was then treated with a
of ammonium chloride until neutral pH and dried over anhydrous magnesium sulfate. A brown oil was obtained after evaporation of the solvent. Purification through flash with n-hexane was used to remove the non-polar reactant (disulfide) then acetone to give a mixture of both acetophenones (product and reactant). Crystallization was performed by vapour diffusion of n-hexane into a chloroform solution held at 283 K to give pure product (0.3 g, yield = 40%). Suitable crystals for X-ray diffraction were obtained by same pathway; m.p. 359.3–359.8 K.1H NMR (CDCl3, 500 MHz, ppm): δ 2.33 (s, 3H), 3.67 (s, 3H), 5.81 (s, 1H), 7.08–7.10 (m ,2H), 7.23-7.25 (m, 2H), 7.43–7.46(m, 2H),7.56–7.59 (m, 1H), 7.95–7.96 (m, 2H). HRMS: calcd. for C16H16O2S [M + H]+ 272.0871; found: 272.0864.
As part of our on-going research on the conformational and electronic interactions of some β-thio-carbonyl and β-bis-thio-carbonyl compounds, e.g. N,N-diethyl-2-[(4-substituted) phenylthio]acetamides, 1-methyl-3-phenylsulfonyl-2-piperidone, 3,3-bis[(4-substituted)phenylsulfanyl]-1-methyl-2-piperidones, 2-alkylthio-2-alkylsulfinyl-acetophenones, 2-alkylthio-2-phenylsulfonyl-acetophenones and 2-alkylsulfinyl-2-alkylsulfonyl-acetophenones, utilizing spectroscopic , theoretical and X-ray diffraction methods (Vinhato et al., 2013; Zukerman-Schpector et al., 2008; Olivato et al., 2013; Distefano et al., 1996) the title compound was synthesized and its determined.
For general background to β-thiocarbonyl and β-bis(thiocarbonyl) compounds, see: Vinhato et al. (2013); Zukerman-Schpector et al. (2008). For related structures, see: Olivato et al. (2013); Distefano et al. (1996). For further synthetic details, see: Ali & McDermott (2002); Zoretic & Soja (1976).
4-Methylthiopenol (5.0 g, 40 mmol) was reacted with bromine (1.1 ml, 20 mmol) in dichloromethane (250 mL) on hydrated silica gel support (25 g of SiO2 and 12 mL of water) to give 4-methylphenyl disulfide (4.1 g, yield = 83%). A white solid was obtained after filtration and evaporation without further purification (Ali & McDermott, 2002). A solution of 2-methoxy acetophenone (0.4 mL, 2.76 mmol, Sigma-Aldrich) in THF (10 ml) was added drop wise to a cooled (195 K) solution of diisopropylamine (0.42 ml, 3.04 mmol) and butyllithium (2.0 ml, 2.76 mmol) in THF (10 ml). After 30 minutes, a solution of 4-methylphenyl disulfide (0.748 g, 3.04 mmol) with hexamethylphosphoramide (HMPA) (0.5 ml, 2.76 mmol) dissolved in THF (10 ml) was added drop wise to the enolate solution (Zoretic & Soja, 1976). After stirring for 3 h, water (50 ml) was added at room temperature and extraction with diethyl ether was performed. The organic layer was then treated with a
of ammonium chloride until neutral pH and dried over anhydrous magnesium sulfate. A brown oil was obtained after evaporation of the solvent. Purification through flash with n-hexane was used to remove the non-polar reactant (disulfide) then acetone to give a mixture of both acetophenones (product and reactant). Crystallization was performed by vapour diffusion of n-hexane into a chloroform solution held at 283 K to give pure product (0.3 g, yield = 40%). Suitable crystals for X-ray diffraction were obtained by same pathway; m.p. 359.3–359.8 K.1H NMR (CDCl3, 500 MHz, ppm): δ 2.33 (s, 3H), 3.67 (s, 3H), 5.81 (s, 1H), 7.08–7.10 (m ,2H), 7.23-7.25 (m, 2H), 7.43–7.46(m, 2H),7.56–7.59 (m, 1H), 7.95–7.96 (m, 2H). HRMS: calcd. for C16H16O2S [M + H]+ 272.0871; found: 272.0864.
detailsCarbon-bound H-atoms were placed in calculated positions (C—H = 0.93 to 0.98 Å) and were included in the
in the riding model approximation, with Uiso(H) = 1.2–1.5Ueq(C).Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SIR (Burla et al., 2014; program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: MarvinSketch (ChemAxon, 2010) and publCIF (Westrip, 2010).C16H16O2S | Dx = 1.268 Mg m−3 |
Mr = 272.35 | Mo Kα radiation, λ = 0.71073 Å |
Orthorhombic, Pca21 | Cell parameters from 1023 reflections |
a = 17.8579 (9) Å | θ = 3.1–18.7° |
b = 8.1257 (4) Å | µ = 0.22 mm−1 |
c = 9.8317 (5) Å | T = 293 K |
V = 1426.66 (12) Å3 | Irregular, colourless |
Z = 4 | 0.41 × 0.14 × 0.08 mm |
F(000) = 576 |
Bruker APEXII CCD diffractometer | 1648 reflections with I > 2σ(I) |
φ and ω scans | Rint = 0.031 |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | θmax = 25.4°, θmin = 2.8° |
Tmin = 0.690, Tmax = 0.745 | h = −21→21 |
5399 measured reflections | k = −9→9 |
2337 independent reflections | l = −10→11 |
Refinement on F2 | Hydrogen site location: inferred from neighbouring sites |
Least-squares matrix: full | H-atom parameters constrained |
R[F2 > 2σ(F2)] = 0.042 | w = 1/[σ2(Fo2) + (0.0294P)2 + 0.2164P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.090 | (Δ/σ)max < 0.001 |
S = 1.02 | Δρmax = 0.14 e Å−3 |
2337 reflections | Δρmin = −0.15 e Å−3 |
174 parameters | Absolute structure: Flack x determined using 552 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013) |
1 restraint | Absolute structure parameter: 0.02 (6) |
Primary atom site location: structure-invariant direct methods |
C16H16O2S | V = 1426.66 (12) Å3 |
Mr = 272.35 | Z = 4 |
Orthorhombic, Pca21 | Mo Kα radiation |
a = 17.8579 (9) Å | µ = 0.22 mm−1 |
b = 8.1257 (4) Å | T = 293 K |
c = 9.8317 (5) Å | 0.41 × 0.14 × 0.08 mm |
Bruker APEXII CCD diffractometer | 2337 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 1648 reflections with I > 2σ(I) |
Tmin = 0.690, Tmax = 0.745 | Rint = 0.031 |
5399 measured reflections |
R[F2 > 2σ(F2)] = 0.042 | H-atom parameters constrained |
wR(F2) = 0.090 | Δρmax = 0.14 e Å−3 |
S = 1.02 | Δρmin = −0.15 e Å−3 |
2337 reflections | Absolute structure: Flack x determined using 552 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013) |
174 parameters | Absolute structure parameter: 0.02 (6) |
1 restraint |
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. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.3662 (3) | 0.6856 (7) | 1.3764 (5) | 0.0916 (18) | |
H1A | 0.3249 | 0.7532 | 1.4046 | 0.137* | |
H1B | 0.4106 | 0.7185 | 1.4243 | 0.137* | |
H1C | 0.3553 | 0.5725 | 1.3964 | 0.137* | |
C2 | 0.3784 (3) | 0.7055 (6) | 1.2258 (5) | 0.0642 (13) | |
C3 | 0.3285 (3) | 0.7876 (6) | 1.1440 (6) | 0.0737 (14) | |
H3 | 0.2850 | 0.8300 | 1.1823 | 0.088* | |
C4 | 0.3411 (3) | 0.8094 (6) | 1.0061 (5) | 0.0683 (13) | |
H4 | 0.3066 | 0.8670 | 0.9537 | 0.082* | |
C5 | 0.4049 (2) | 0.7455 (5) | 0.9462 (5) | 0.0564 (11) | |
C6 | 0.4553 (2) | 0.6622 (5) | 1.0273 (5) | 0.0615 (12) | |
H6 | 0.4987 | 0.6186 | 0.9893 | 0.074* | |
C7 | 0.4416 (3) | 0.6434 (5) | 1.1643 (5) | 0.0635 (13) | |
H7 | 0.4763 | 0.5868 | 1.2171 | 0.076* | |
C8 | 0.4839 (2) | 0.9437 (5) | 0.7603 (5) | 0.0576 (10) | |
H8 | 0.4930 | 0.9708 | 0.6646 | 0.069* | |
C9 | 0.6015 (3) | 0.8116 (6) | 0.7474 (6) | 0.0834 (15) | |
H9A | 0.6139 | 0.8637 | 0.6627 | 0.125* | |
H9B | 0.5771 | 0.7085 | 0.7299 | 0.125* | |
H9C | 0.6465 | 0.7927 | 0.7987 | 0.125* | |
C10 | 0.4468 (2) | 1.0888 (5) | 0.8275 (5) | 0.0559 (11) | |
C11 | 0.3852 (2) | 1.1782 (5) | 0.7587 (5) | 0.0539 (10) | |
C12 | 0.3573 (2) | 1.3181 (5) | 0.8205 (5) | 0.0674 (13) | |
H12 | 0.3767 | 1.3519 | 0.9037 | 0.081* | |
C13 | 0.3007 (3) | 1.4083 (5) | 0.7595 (7) | 0.0793 (14) | |
H13 | 0.2828 | 1.5027 | 0.8021 | 0.095* | |
C14 | 0.2709 (3) | 1.3608 (6) | 0.6381 (7) | 0.0781 (14) | |
H14 | 0.2325 | 1.4212 | 0.5983 | 0.094* | |
C15 | 0.2984 (3) | 1.2225 (7) | 0.5754 (5) | 0.0840 (16) | |
H15 | 0.2780 | 1.1887 | 0.4930 | 0.101* | |
C16 | 0.3556 (3) | 1.1333 (6) | 0.6325 (5) | 0.0736 (13) | |
H16 | 0.3748 | 1.0423 | 0.5868 | 0.088* | |
O1 | 0.55239 (15) | 0.9162 (4) | 0.8235 (3) | 0.0666 (9) | |
O2 | 0.46803 (18) | 1.1328 (4) | 0.9400 (3) | 0.0727 (9) | |
S | 0.41986 (7) | 0.76542 (13) | 0.76791 (16) | 0.0711 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.090 (4) | 0.115 (5) | 0.070 (4) | −0.030 (3) | 0.006 (3) | 0.005 (3) |
C2 | 0.065 (3) | 0.064 (3) | 0.064 (4) | −0.020 (2) | 0.006 (3) | 0.000 (3) |
C3 | 0.061 (3) | 0.077 (3) | 0.084 (4) | −0.004 (3) | 0.011 (3) | 0.002 (3) |
C4 | 0.064 (3) | 0.064 (3) | 0.077 (4) | −0.001 (2) | −0.007 (3) | 0.006 (3) |
C5 | 0.061 (3) | 0.048 (2) | 0.060 (3) | −0.011 (2) | −0.001 (2) | −0.003 (2) |
C6 | 0.061 (3) | 0.056 (3) | 0.067 (3) | 0.000 (2) | −0.001 (2) | −0.001 (3) |
C7 | 0.066 (3) | 0.058 (3) | 0.066 (4) | −0.006 (2) | −0.008 (3) | 0.009 (3) |
C8 | 0.070 (3) | 0.058 (2) | 0.045 (2) | −0.0025 (19) | −0.003 (3) | 0.003 (3) |
C9 | 0.084 (3) | 0.095 (3) | 0.072 (4) | 0.024 (3) | −0.003 (3) | 0.000 (4) |
C10 | 0.070 (3) | 0.052 (3) | 0.046 (3) | −0.009 (2) | 0.007 (2) | 0.002 (2) |
C11 | 0.061 (2) | 0.051 (2) | 0.049 (3) | −0.0077 (18) | 0.012 (3) | 0.003 (3) |
C12 | 0.066 (3) | 0.065 (3) | 0.071 (3) | −0.009 (2) | 0.012 (3) | −0.013 (3) |
C13 | 0.069 (3) | 0.065 (3) | 0.104 (4) | 0.006 (2) | 0.013 (4) | −0.008 (4) |
C14 | 0.064 (3) | 0.077 (3) | 0.094 (4) | 0.009 (3) | 0.013 (3) | 0.013 (3) |
C15 | 0.085 (3) | 0.102 (4) | 0.065 (4) | 0.014 (3) | −0.011 (3) | 0.010 (3) |
C16 | 0.090 (3) | 0.078 (3) | 0.053 (3) | 0.017 (3) | −0.004 (3) | −0.007 (3) |
O1 | 0.0665 (18) | 0.077 (2) | 0.057 (2) | 0.0086 (16) | −0.0038 (16) | −0.0012 (16) |
O2 | 0.094 (2) | 0.076 (2) | 0.048 (2) | −0.0017 (17) | −0.0047 (18) | −0.0078 (19) |
S | 0.0948 (8) | 0.0600 (6) | 0.0583 (7) | −0.0129 (6) | −0.0079 (8) | −0.0055 (8) |
C1—C2 | 1.505 (7) | C8—H8 | 0.9800 |
C1—H1A | 0.9600 | C9—O1 | 1.432 (5) |
C1—H1B | 0.9600 | C9—H9A | 0.9600 |
C1—H1C | 0.9600 | C9—H9B | 0.9600 |
C2—C3 | 1.373 (7) | C9—H9C | 0.9600 |
C2—C7 | 1.376 (6) | C10—O2 | 1.224 (5) |
C3—C4 | 1.385 (7) | C10—C11 | 1.480 (6) |
C3—H3 | 0.9300 | C11—C12 | 1.382 (6) |
C4—C5 | 1.383 (6) | C11—C16 | 1.398 (7) |
C4—H4 | 0.9300 | C12—C13 | 1.384 (6) |
C5—C6 | 1.379 (6) | C12—H12 | 0.9300 |
C5—S | 1.781 (5) | C13—C14 | 1.363 (8) |
C6—C7 | 1.378 (6) | C13—H13 | 0.9300 |
C6—H6 | 0.9300 | C14—C15 | 1.373 (6) |
C7—H7 | 0.9300 | C14—H14 | 0.9300 |
C8—O1 | 1.390 (4) | C15—C16 | 1.372 (6) |
C8—C10 | 1.505 (5) | C15—H15 | 0.9300 |
C8—S | 1.847 (4) | C16—H16 | 0.9300 |
C2—C1—H1A | 109.5 | O1—C9—H9A | 109.5 |
C2—C1—H1B | 109.5 | O1—C9—H9B | 109.5 |
H1A—C1—H1B | 109.5 | H9A—C9—H9B | 109.5 |
C2—C1—H1C | 109.5 | O1—C9—H9C | 109.5 |
H1A—C1—H1C | 109.5 | H9A—C9—H9C | 109.5 |
H1B—C1—H1C | 109.5 | H9B—C9—H9C | 109.5 |
C3—C2—C7 | 116.9 (5) | O2—C10—C11 | 120.0 (4) |
C3—C2—C1 | 122.3 (5) | O2—C10—C8 | 119.2 (4) |
C7—C2—C1 | 120.8 (5) | C11—C10—C8 | 120.7 (4) |
C2—C3—C4 | 122.0 (5) | C12—C11—C16 | 117.9 (4) |
C2—C3—H3 | 119.0 | C12—C11—C10 | 118.1 (4) |
C4—C3—H3 | 119.0 | C16—C11—C10 | 123.9 (4) |
C5—C4—C3 | 120.2 (5) | C11—C12—C13 | 120.6 (5) |
C5—C4—H4 | 119.9 | C11—C12—H12 | 119.7 |
C3—C4—H4 | 119.9 | C13—C12—H12 | 119.7 |
C6—C5—C4 | 118.4 (5) | C14—C13—C12 | 120.9 (5) |
C6—C5—S | 121.0 (4) | C14—C13—H13 | 119.5 |
C4—C5—S | 120.6 (4) | C12—C13—H13 | 119.5 |
C7—C6—C5 | 120.2 (5) | C13—C14—C15 | 119.0 (5) |
C7—C6—H6 | 119.9 | C13—C14—H14 | 120.5 |
C5—C6—H6 | 119.9 | C15—C14—H14 | 120.5 |
C2—C7—C6 | 122.3 (5) | C16—C15—C14 | 121.0 (5) |
C2—C7—H7 | 118.8 | C16—C15—H15 | 119.5 |
C6—C7—H7 | 118.8 | C14—C15—H15 | 119.5 |
O1—C8—C10 | 108.5 (4) | C15—C16—C11 | 120.4 (5) |
O1—C8—S | 113.6 (3) | C15—C16—H16 | 119.8 |
C10—C8—S | 108.9 (3) | C11—C16—H16 | 119.8 |
O1—C8—H8 | 108.6 | C8—O1—C9 | 113.7 (3) |
C10—C8—H8 | 108.6 | C5—S—C8 | 101.8 (2) |
S—C8—H8 | 108.6 | ||
C7—C2—C3—C4 | −0.8 (7) | O2—C10—C11—C16 | −177.7 (4) |
C1—C2—C3—C4 | 178.2 (4) | C8—C10—C11—C16 | 2.3 (6) |
C2—C3—C4—C5 | 1.0 (7) | C16—C11—C12—C13 | 1.2 (6) |
C3—C4—C5—C6 | −0.7 (6) | C10—C11—C12—C13 | 178.7 (4) |
C3—C4—C5—S | 177.5 (4) | C11—C12—C13—C14 | 0.5 (7) |
C4—C5—C6—C7 | 0.3 (6) | C12—C13—C14—C15 | −0.8 (7) |
S—C5—C6—C7 | −177.9 (4) | C13—C14—C15—C16 | −0.6 (8) |
C3—C2—C7—C6 | 0.3 (7) | C14—C15—C16—C11 | 2.4 (8) |
C1—C2—C7—C6 | −178.7 (4) | C12—C11—C16—C15 | −2.7 (7) |
C5—C6—C7—C2 | 0.0 (7) | C10—C11—C16—C15 | 180.0 (4) |
O1—C8—C10—O2 | −18.2 (5) | C10—C8—O1—C9 | −164.3 (3) |
S—C8—C10—O2 | 105.9 (4) | S—C8—O1—C9 | 74.4 (4) |
O1—C8—C10—C11 | 161.7 (3) | C6—C5—S—C8 | −83.1 (4) |
S—C8—C10—C11 | −74.1 (4) | C4—C5—S—C8 | 98.8 (4) |
O2—C10—C11—C12 | 4.9 (6) | O1—C8—S—C5 | 63.2 (4) |
C8—C10—C11—C12 | −175.0 (4) | C10—C8—S—C5 | −57.9 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1B···O2i | 0.96 | 2.49 | 3.366 (6) | 152 |
C8—H8···O2ii | 0.98 | 2.46 | 3.323 (6) | 146 |
Symmetry codes: (i) −x+1, −y+2, z+1/2; (ii) −x+1, −y+2, z−1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1B···O2i | 0.96 | 2.49 | 3.366 (6) | 152 |
C8—H8···O2ii | 0.98 | 2.46 | 3.323 (6) | 146 |
Symmetry codes: (i) −x+1, −y+2, z+1/2; (ii) −x+1, −y+2, z−1/2. |
Acknowledgements
We thank Professor Regina H. A. Santos from IQSC–USP for the X-ray data collection. The Brazilian agencies CNPq (305626/2013-2 to JZS; 301180/2013-0 to PRO) and FAPESP are acknowledged for financial support.
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