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2-Chloroethyl ethyl sulfide (Cl-CH2-CH2-S-CH2-CH3 or C4H9ClS) is used as an analogue for mustard gas in biomedical studies. The Cl-C-C-S and the two C-C-S-C torsion angles are -177.38 (9), 83.17 (14) and 73.81 (16)°, respectively, and are similar to values that have been predicted, by ab initio quantum calculations, for the corresponding parameters in mustard gas. There are no strong intermolecular interactions, and the packing in the crystal structure bears some resemblance to hexagonal close packing.
Supporting information
CCDC reference: 234874
Key indicators
- Single-crystal X-ray study
- T = 150 K
- Mean (C-C) = 0.003 Å
- R factor = 0.024
- wR factor = 0.064
- Data-to-parameter ratio = 25.7
checkCIF/PLATON results
No syntax errors found
Alert level B
PLAT063_ALERT_3_B Crystal Probably too Large for Beam Size ....... 1.00 mm
Alert level C
ABSTM02_ALERT_3_C The ratio of expected to reported Tmax/Tmin(RR') is < 0.90
Tmin and Tmax reported: 0.352 0.790
Tmin' and Tmax expected: 0.455 0.791
RR' = 0.774
Please check that your absorption correction is appropriate.
CRYSR01_ALERT_1_C _exptl_crystal_size_rad not in the CIF when expected.
PLAT061_ALERT_3_C Tmax/Tmin Range Test RR' too Large ............. 0.77
Alert level G
REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is
correct. If it is not, please give the correct count in the
_publ_section_exptl_refinement section of the submitted CIF.
From the CIF: _diffrn_reflns_theta_max 28.26
From the CIF: _reflns_number_total 1441
Count of symmetry unique reflns 894
Completeness (_total/calc) 161.19%
TEST3: Check Friedels for noncentro structure
Estimate of Friedel pairs measured 547
Fraction of Friedel pairs measured 0.612
Are heavy atom types Z>Si present yes
0 ALERT level A = In general: serious problem
1 ALERT level B = Potentially serious problem
3 ALERT level C = Check and explain
1 ALERT level G = General alerts; check
1 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
0 ALERT type 2 Indicator that the structure model may be wrong or deficient
3 ALERT type 3 Indicator that the structure quality may be low
1 ALERT type 4 Improvement, methodology, query or suggestion
Data collection: SMART (Bruker, 2001); cell refinement: SAINT; data reduction: SAINT (Bruker, 2002); program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: CRYSTALS (Watkin et al., 2003); molecular graphics: XP (Sheldrick, 1997); software used to prepare material for publication: CRYSTALS, enCIFer (CCDC, 2002), PLATON (Spek, 2003) and WinGX (Farrugia, 1999).
2-Chloroethyl ethyl sulfide
top
Crystal data top
C4H9ClS | F(000) = 264 |
Mr = 124.63 | Dx = 1.287 Mg m−3 |
Orthorhombic, Pna21 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2c -2n | Cell parameters from 3540 reflections |
a = 15.343 (3) Å | θ = 3–29° |
b = 8.5760 (14) Å | µ = 0.78 mm−1 |
c = 4.8863 (8) Å | T = 150 K |
V = 642.96 (18) Å3 | Cylinder, colourless |
Z = 4 | 1.00 × 0.30 × 0.30 mm |
Data collection top
Bruker SMART APEX diffractometer | 1313 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.03 |
ω scans | θmax = 28.3°, θmin = 2.7° |
Absorption correction: multi-scan SADABS (Sheldrick, 2002) | h = −19→19 |
Tmin = 0.352, Tmax = 0.790 | k = −9→11 |
4048 measured reflections | l = −6→6 |
1441 independent reflections | |
Refinement top
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.024 | H-atom parameters constrained |
wR(F2) = 0.064 | w = 1/[σ2(Fo2) + (0.0194P)2 + 0.136P] where P = (Fo2 + 2Fc2)/3
(SHELXL97; Sheldrick, 1997) |
S = 1.01 | (Δ/σ)max = 0.001 |
1438 reflections | Δρmax = 0.36 e Å−3 |
56 parameters | Δρmin = −0.25 e Å−3 |
1 restraint | Absolute structure: Flack (1983); 597 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: 0.23 (12) |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
Cl1 | 0.44869 (3) | 0.12110 (5) | 0.13095 (14) | 0.0353 | |
C2 | 0.37514 (12) | 0.1959 (2) | 0.3892 (4) | 0.0315 | |
C3 | 0.32202 (11) | 0.0630 (2) | 0.5064 (4) | 0.0276 | |
S4 | 0.24368 (3) | 0.13448 (5) | 0.75570 (15) | 0.0359 | |
C5 | 0.15538 (12) | 0.1954 (2) | 0.5312 (4) | 0.0379 | |
C6 | 0.10405 (12) | 0.0620 (3) | 0.4094 (5) | 0.0441 | |
H21 | 0.4096 | 0.2463 | 0.5388 | 0.0377* | |
H22 | 0.3352 | 0.2745 | 0.3049 | 0.0377* | |
H31 | 0.3621 | −0.0130 | 0.5975 | 0.0331* | |
H32 | 0.2901 | 0.0096 | 0.3545 | 0.0331* | |
H51 | 0.1145 | 0.2622 | 0.6391 | 0.0455* | |
H52 | 0.1809 | 0.2579 | 0.3780 | 0.0455* | |
H61 | 0.0569 | 0.1043 | 0.2890 | 0.0529* | |
H62 | 0.0774 | −0.0012 | 0.5598 | 0.0529* | |
H63 | 0.1438 | −0.0055 | 0.2987 | 0.0529* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Cl1 | 0.0313 (2) | 0.0445 (2) | 0.0302 (2) | 0.00303 (18) | 0.0016 (2) | −0.0013 (2) |
C2 | 0.0350 (9) | 0.0308 (9) | 0.0286 (9) | 0.0011 (7) | 0.0035 (8) | −0.0035 (8) |
C3 | 0.0295 (8) | 0.0270 (8) | 0.0263 (8) | 0.0039 (6) | −0.0012 (8) | −0.0022 (7) |
S4 | 0.0336 (2) | 0.0474 (3) | 0.0268 (2) | 0.0031 (2) | 0.0006 (2) | −0.0039 (3) |
C5 | 0.0326 (9) | 0.0307 (9) | 0.0505 (12) | 0.0075 (8) | −0.0020 (9) | −0.0017 (8) |
C6 | 0.0307 (10) | 0.0419 (11) | 0.0598 (15) | 0.0010 (8) | −0.0077 (11) | −0.0026 (10) |
Geometric parameters (Å, º) top
Cl1—C2 | 1.810 (2) | S4—C5 | 1.820 (2) |
C2—H22 | 1.000 | C5—H52 | 1.000 |
C2—H21 | 1.000 | C5—H51 | 1.000 |
C2—C3 | 1.513 (3) | C5—C6 | 1.512 (3) |
C3—H32 | 1.000 | C6—H63 | 1.000 |
C3—H31 | 1.000 | C6—H62 | 1.000 |
C3—S4 | 1.818 (2) | C6—H61 | 1.000 |
| | | |
H22—C2—H21 | 109.467 | H52—C5—H51 | 109.466 |
H22—C2—C3 | 109.481 | H52—C5—C6 | 108.313 |
H21—C2—C3 | 109.481 | H51—C5—C6 | 108.313 |
H22—C2—Cl1 | 109.482 | H52—C5—S4 | 108.313 |
H21—C2—Cl1 | 109.482 | H51—C5—S4 | 108.314 |
C3—C2—Cl1 | 109.43 (12) | C6—C5—S4 | 114.06 (14) |
H32—C3—H31 | 109.467 | H63—C6—H62 | 109.476 |
H32—C3—S4 | 109.131 | H63—C6—H61 | 109.475 |
H31—C3—S4 | 109.131 | H62—C6—H61 | 109.476 |
H32—C3—C2 | 109.131 | H63—C6—C5 | 109.466 |
H31—C3—C2 | 109.131 | H62—C6—C5 | 109.467 |
S4—C3—C2 | 110.83 (12) | H61—C6—C5 | 109.467 |
C5—S4—C3 | 100.67 (10) | | |
| | | |
C5—S4—C3—C2 | 83.17 (14) | Cl1—C2—C3—S4 | −177.38 (9) |
C3—S4—C5—C6 | 73.81 (16) | | |
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