organic compounds
4-Chloro-3-ethylphenol
aDepartment of Chemistry, Vassar College, Poughkeepsie, NY 12604, USA
*Correspondence e-mail: jotanski@vassar.edu
The title compound, C8H9ClO, packs with two independent molecules in the without significant differences in corresponding bond lengths and angles, with the ethyl group in each oriented nearly perpendicular to the aromatic ring having ring-to-side chain torsion angles of 81.14 (18) and −81.06 (19)°. In the crystal, molecules form an O—H⋯O hydrogen-bonded chain extending along the b-axis direction, through the phenol groups in which the H atoms are disordered. These chains pack together in the solid state, giving a sheet lying parallel to (001), via an offset face-to-face π-stacking interaction characterized by a centroid–centroid distance of 3.580 (1) Å, together with a short intermolecular Cl⋯Cl contact [3.412 (1) Å].
Keywords: crystal structure.
CCDC reference: 1008296
Related literature
For information regarding the synthesis of 4-chloro-3-ethylphenol, see the following patents: Awano et al. (1987) or Schroetter et al. (1977). For applications in biological systems, see: Gerbershagen et al. (2005); Low et al. (1997). For similar chlorinated see: Cox (1995, 2003); Oswald et al. (2005). For more information on π-stacking, see: Lueckheide et al. (2013) and on halogen–halogen interactions, see: Pedireddi et al. (1994).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL, OLEX2 (Dolomanov et al., 2009) and Mercury (Macrae et al., 2006).
Supporting information
CCDC reference: 1008296
https://doi.org/10.1107/S1600536814013919/zs2303sup1.cif
contains datablocks I, New_Global_Publ_Block. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536814013919/zs2303Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536814013919/zs2303Isup3.cml
4-Chloro-3-ethylphenol was purchased from Aldrich Chemical Company, USA, and recrystallized from hexanes.
All non-hydrogen atoms were refined anisotropically. Hydrogen atoms on carbon were included in calculated positions and refined using a riding model with C–H = 0.95, 0.98 and 0.99 Å and Uiso(H) = 1.2, 1.5 and 1.2 × Ueq(C) of the aryl, methyl and methylene C-atoms, respectively. The positions of the disordered phenolic hydrogen atoms were found in the difference map and refined semi-freely at 50% occupancy using a distance restraint d(O–H) = 0.84 Å, and Uiso(H) = 1.2× Ueq(O).
4-Chloro-3-ethylphenol, the title compound, can be synthesized by chlorination of 3-ethylphenol by SO2Cl2 in the presence of FeCl3 in CCl4 (Awano et al., 1987) or by adding the hydroxyl group to 1-ethyl-2-nitrobenzene followed by an acidic workup and a Sandmeyer reaction with CuCl (Schroetter et al., 1977). The title compound has been found to be useful in multiple biological applications, including testing the contracture in malignant hypothermia skeletal tissue (Low et al., 1997) and in biological activity on Ca2+ deposits in muscle cells (Gerbershagen et al., 2005).
The two independent molecules of the title compound in the
(Fig. 1) exhibit C—Cl bond lengths of 1.7430 (15) and 1.7469 (15) Å, and C—O bond lengths of 1.3751 (18) and 1.3778 (17) Å, respectively. These are in very close agreement with analogous bond lengths in the stuctures of 4-chlorophenol (Oswald et al., 2005), 4-chloro-3-methylphenol (Cox, 2003), and 4-chloro-3,5-dimethylphenol (Cox, 1995). The ethyl group is rotated nearly perpendicular to the plane of the ring for each independent molecule, displaying very similar torsion angles of 81.14 (18)° (C4—C3—C7—C8) and -81.06 (19)° (C12—C11—C15—C16). The structure forms a one-dimensional O—H···O hydrogen-bonded chain through the phenol groups, in which the phenol protons are 50% rotationally disordered (Fig. 2). These chains run parallel to the crystallographic b-axis. Each independent molecule forms hydrogen bonds with a neighboring equivalent independent molecule, with an oxygen–oxygen distance (O1···O1i) of 2.708 (3) Å and an oxygen–oxygen distance (O2···O2ii) of 2.704 (2) Å [for symmetry codes (i) and (ii), see Table 1]. These pairwise dimers are hydrogen-bonded to one another resulting in a third unique hydrogen bond, (O1···O2i), with length 2.6642 (17) Å. A similar hydrogen-bonding motif is found in the ordered one-dimensional hydrogen bonding chain in the structure of 4-chloro-3-methylphenol (Cox, 2003), where the O···O distances are similar at 2.711 (2) and 2.714 (2) Å. Unlike 4-chloro-3-methylphenol, where the planes of the aromatic units on each side of the hydrogen-bonded chain are parallel, in the the title compound they form a herringbone (edge-to-face or T) motif.Neighboring hydrogen-bonded chains pack together in the solid state to form a two-dimensional sheet parallel to the 0 0 1 plane via an offset face-to-face π-stacking interaction of one of the two independent molecules, whereas the other molecule does not engage in π-stacking (Fig. 3). The π-stacking is characterized by a centroid-to-centroid distance of 3.580 (1) Å, a plane-to-centroid distance of 3.410 (1) Å, and a ring offset or ring-slipage distance of 1.092 (3) Å (Lueckheide et al., 2013). Neighboring sheets are further linked by a short intermolecular chlorine–chlorine contact (Cl1···Cl2iii) of 3.412 (1) Å, which is less than the sum of the van der Waals radii of 3.50 Å for chlorine–chlorine interactions (Pedireddi et al., 1994). For symmetry code (iii): -x, -y + 1, -z.
For information regarding the synthesis of 4-chloro-3-ethylphenol, see the following patents: Awano et al. (1987) or Schroetter et al. (1977). For applications in biological systems, see: Gerbershagen et al. (2005); Low et al. (1997). For similar chlorinated π-stacking, see: Lueckheide et al. (2013) and on halogen–halogen interactions, see: Pedireddi et al. (1994).
see: Cox (1995, 2003); Oswald et al. (2005). For more information onData collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008), OLEX2 (Dolomanov et al., 2009) and Mercury (Macrae et al., 2006).Fig. 1. A view of the two independent molecules of the title compound with the atom numbering scheme. Displacement ellipsoids are shown at the 50% probability level. The disordered phenolic hydrogen atoms are represented with dashed open bonds. | |
Fig. 2. A view of the one-dimensional hydrogen-bonded chain extending along b, with displacement ellipsoids shown at the 50% probability level. For symmetry codes (i) and (ii), see Table 1. | |
Fig. 3. A view of the offset face-to-face π-stacking in the structure of title compound, with a solid line indicating one interaction and a dashed line indicating one of the Cl1···Cl2 interactions. For symmetry codes: (iii) -x, -y + 1, -z; (iv): -x, -y + 1, -z + 1. Displacement ellipsoids are shown at the 50% probability level. |
C8H9ClO | Z = 4 |
Mr = 156.60 | F(000) = 328 |
Triclinic, P1 | Dx = 1.358 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.5580 (7) Å | Cell parameters from 9958 reflections |
b = 8.6854 (8) Å | θ = 2.7–30.5° |
c = 12.2520 (11) Å | µ = 0.42 mm−1 |
α = 78.363 (1)° | T = 125 K |
β = 78.762 (1)° | Block, colourless |
γ = 80.355 (1)° | 0.20 × 0.15 × 0.10 mm |
V = 765.72 (12) Å3 |
Bruker APEXII CCD diffractometer | 4656 independent reflections |
Radiation source: fine-focus sealed tube | 4176 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.019 |
φ and ω scans | θmax = 30.5°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Bruker, 2007) | h = −10→10 |
Tmin = 0.910, Tmax = 0.949 | k = −12→12 |
17904 measured reflections | l = −17→17 |
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) = 0.107 | H-atom parameters constrained |
S = 1.13 | w = 1/[σ2(Fo2) + (0.0336P)2 + 0.751P] where P = (Fo2 + 2Fc2)/3 |
4656 reflections | (Δ/σ)max < 0.001 |
183 parameters | Δρmax = 0.48 e Å−3 |
4 restraints | Δρmin = −0.26 e Å−3 |
C8H9ClO | γ = 80.355 (1)° |
Mr = 156.60 | V = 765.72 (12) Å3 |
Triclinic, P1 | Z = 4 |
a = 7.5580 (7) Å | Mo Kα radiation |
b = 8.6854 (8) Å | µ = 0.42 mm−1 |
c = 12.2520 (11) Å | T = 125 K |
α = 78.363 (1)° | 0.20 × 0.15 × 0.10 mm |
β = 78.762 (1)° |
Bruker APEXII CCD diffractometer | 4656 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2007) | 4176 reflections with I > 2σ(I) |
Tmin = 0.910, Tmax = 0.949 | Rint = 0.019 |
17904 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 4 restraints |
wR(F2) = 0.107 | H-atom parameters constrained |
S = 1.13 | Δρmax = 0.48 e Å−3 |
4656 reflections | Δρmin = −0.26 e Å−3 |
183 parameters |
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. |
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 > σ(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 | Occ. (<1) | |
Cl1 | −0.28100 (5) | 0.74811 (5) | 0.30473 (4) | 0.02708 (10) | |
O1 | 0.36924 (19) | 0.62233 (15) | 0.52135 (12) | 0.0328 (3) | |
H1 | 0.4258 | 0.5340 | 0.5280 | 0.039* | 0.50 |
H1A | 0.4024 | 0.7019 | 0.5320 | 0.039* | 0.50 |
C1 | 0.2194 (2) | 0.65320 (17) | 0.46838 (13) | 0.0186 (3) | |
C2 | 0.20646 (19) | 0.56371 (16) | 0.38898 (12) | 0.0173 (3) | |
H2B | 0.3035 | 0.4836 | 0.3702 | 0.021* | |
C3 | 0.05376 (19) | 0.58914 (16) | 0.33626 (11) | 0.0157 (2) | |
C4 | −0.08454 (19) | 0.70975 (17) | 0.36563 (12) | 0.0171 (3) | |
C5 | −0.0719 (2) | 0.80067 (17) | 0.44421 (13) | 0.0192 (3) | |
H5A | −0.1676 | 0.8822 | 0.4622 | 0.023* | |
C6 | 0.0802 (2) | 0.77258 (17) | 0.49633 (12) | 0.0197 (3) | |
H6A | 0.0894 | 0.8340 | 0.5505 | 0.024* | |
C7 | 0.0464 (2) | 0.49276 (18) | 0.24819 (13) | 0.0207 (3) | |
H7A | −0.0793 | 0.4686 | 0.2557 | 0.025* | |
H7B | 0.1272 | 0.3910 | 0.2611 | 0.025* | |
C8 | 0.1054 (3) | 0.5813 (2) | 0.12819 (13) | 0.0276 (3) | |
H8A | 0.1021 | 0.5144 | 0.0733 | 0.041* | |
H8B | 0.2294 | 0.6062 | 0.1207 | 0.041* | |
H8C | 0.0223 | 0.6799 | 0.1140 | 0.041* | |
Cl2 | 0.36637 (6) | 0.24774 (5) | −0.04071 (3) | 0.02827 (10) | |
O2 | 0.53688 (18) | 0.12745 (14) | 0.41968 (10) | 0.0271 (3) | |
H2 | 0.5511 | 0.2054 | 0.4427 | 0.033* | 0.50 |
H2A | 0.5219 | 0.0420 | 0.4598 | 0.033* | 0.50 |
C9 | 0.4935 (2) | 0.15527 (17) | 0.31266 (12) | 0.0171 (3) | |
C10 | 0.37918 (19) | 0.06378 (16) | 0.28560 (12) | 0.0172 (3) | |
H10A | 0.3293 | −0.0170 | 0.3419 | 0.021* | |
C11 | 0.33641 (19) | 0.08887 (17) | 0.17674 (12) | 0.0172 (3) | |
C12 | 0.4129 (2) | 0.20931 (18) | 0.09713 (12) | 0.0188 (3) | |
C13 | 0.5254 (2) | 0.30228 (18) | 0.12387 (13) | 0.0204 (3) | |
H13A | 0.5744 | 0.3839 | 0.0679 | 0.024* | |
C14 | 0.5662 (2) | 0.27599 (18) | 0.23228 (13) | 0.0195 (3) | |
H14A | 0.6426 | 0.3394 | 0.2513 | 0.023* | |
C15 | 0.2080 (2) | −0.00900 (19) | 0.15052 (14) | 0.0233 (3) | |
H15A | 0.2089 | −0.1105 | 0.2046 | 0.028* | |
H15B | 0.2514 | −0.0339 | 0.0736 | 0.028* | |
C16 | 0.0132 (2) | 0.0767 (2) | 0.15729 (16) | 0.0292 (3) | |
H16A | −0.0649 | 0.0098 | 0.1385 | 0.044* | |
H16B | 0.0116 | 0.1770 | 0.1036 | 0.044* | |
H16C | −0.0320 | 0.0981 | 0.2341 | 0.044* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.01775 (17) | 0.0333 (2) | 0.0317 (2) | 0.00267 (14) | −0.00926 (14) | −0.00914 (16) |
O1 | 0.0381 (7) | 0.0216 (5) | 0.0469 (8) | −0.0047 (5) | −0.0307 (6) | −0.0013 (5) |
C1 | 0.0229 (7) | 0.0145 (6) | 0.0204 (6) | −0.0042 (5) | −0.0092 (5) | −0.0007 (5) |
C2 | 0.0173 (6) | 0.0147 (6) | 0.0199 (6) | −0.0004 (5) | −0.0041 (5) | −0.0032 (5) |
C3 | 0.0172 (6) | 0.0154 (6) | 0.0147 (6) | −0.0028 (5) | −0.0022 (5) | −0.0027 (5) |
C4 | 0.0152 (6) | 0.0188 (6) | 0.0172 (6) | −0.0018 (5) | −0.0030 (5) | −0.0029 (5) |
C5 | 0.0201 (6) | 0.0165 (6) | 0.0199 (6) | −0.0011 (5) | −0.0007 (5) | −0.0042 (5) |
C6 | 0.0262 (7) | 0.0162 (6) | 0.0180 (6) | −0.0039 (5) | −0.0045 (5) | −0.0044 (5) |
C7 | 0.0224 (7) | 0.0223 (7) | 0.0195 (6) | −0.0016 (5) | −0.0051 (5) | −0.0084 (5) |
C8 | 0.0329 (8) | 0.0333 (8) | 0.0170 (7) | 0.0006 (7) | −0.0055 (6) | −0.0085 (6) |
Cl2 | 0.0300 (2) | 0.0399 (2) | 0.01504 (16) | −0.00312 (16) | −0.00605 (13) | −0.00440 (14) |
O2 | 0.0433 (7) | 0.0205 (5) | 0.0222 (5) | −0.0027 (5) | −0.0190 (5) | −0.0029 (4) |
C9 | 0.0188 (6) | 0.0160 (6) | 0.0173 (6) | 0.0007 (5) | −0.0071 (5) | −0.0035 (5) |
C10 | 0.0184 (6) | 0.0152 (6) | 0.0180 (6) | −0.0014 (5) | −0.0048 (5) | −0.0022 (5) |
C11 | 0.0161 (6) | 0.0174 (6) | 0.0194 (6) | 0.0012 (5) | −0.0054 (5) | −0.0063 (5) |
C12 | 0.0182 (6) | 0.0240 (7) | 0.0140 (6) | 0.0010 (5) | −0.0042 (5) | −0.0045 (5) |
C13 | 0.0185 (6) | 0.0232 (7) | 0.0183 (6) | −0.0040 (5) | −0.0016 (5) | −0.0011 (5) |
C14 | 0.0178 (6) | 0.0200 (6) | 0.0220 (7) | −0.0036 (5) | −0.0052 (5) | −0.0039 (5) |
C15 | 0.0236 (7) | 0.0223 (7) | 0.0280 (8) | −0.0042 (6) | −0.0098 (6) | −0.0075 (6) |
C16 | 0.0220 (7) | 0.0332 (9) | 0.0340 (9) | −0.0055 (6) | −0.0099 (6) | −0.0031 (7) |
Cl1—C4 | 1.7430 (15) | Cl2—C12 | 1.7469 (15) |
O1—C1 | 1.3751 (18) | O2—C9 | 1.3778 (17) |
O1—H1 | 0.8098 | O2—H2 | 0.8144 |
O1—H1A | 0.8145 | O2—H2A | 0.8150 |
C1—C2 | 1.388 (2) | C9—C10 | 1.391 (2) |
C1—C6 | 1.391 (2) | C9—C14 | 1.392 (2) |
C2—C3 | 1.395 (2) | C10—C11 | 1.399 (2) |
C2—H2B | 0.9500 | C10—H10A | 0.9500 |
C3—C4 | 1.3993 (19) | C11—C12 | 1.397 (2) |
C3—C7 | 1.5072 (19) | C11—C15 | 1.508 (2) |
C4—C5 | 1.388 (2) | C12—C13 | 1.388 (2) |
C5—C6 | 1.385 (2) | C13—C14 | 1.388 (2) |
C5—H5A | 0.9500 | C13—H13A | 0.9500 |
C6—H6A | 0.9500 | C14—H14A | 0.9500 |
C7—C8 | 1.535 (2) | C15—C16 | 1.529 (2) |
C7—H7A | 0.9900 | C15—H15A | 0.9900 |
C7—H7B | 0.9900 | C15—H15B | 0.9900 |
C8—H8A | 0.9800 | C16—H16A | 0.9800 |
C8—H8B | 0.9800 | C16—H16B | 0.9800 |
C8—H8C | 0.9800 | C16—H16C | 0.9800 |
C1—O1—H1 | 119.3 | C9—O2—H2 | 115.6 |
C1—O1—H1A | 113.5 | C9—O2—H2A | 118.3 |
H1—O1—H1A | 126.1 | H2—O2—H2A | 124.2 |
O1—C1—C2 | 119.94 (14) | O2—C9—C10 | 120.42 (13) |
O1—C1—C6 | 119.55 (14) | O2—C9—C14 | 118.89 (13) |
C2—C1—C6 | 120.51 (13) | C10—C9—C14 | 120.69 (13) |
C1—C2—C3 | 121.26 (13) | C9—C10—C11 | 121.06 (13) |
C1—C2—H2B | 119.4 | C9—C10—H10A | 119.5 |
C3—C2—H2B | 119.4 | C11—C10—H10A | 119.5 |
C2—C3—C4 | 117.27 (13) | C12—C11—C10 | 117.20 (13) |
C2—C3—C7 | 119.86 (13) | C12—C11—C15 | 122.80 (13) |
C4—C3—C7 | 122.82 (13) | C10—C11—C15 | 119.97 (13) |
C5—C4—C3 | 121.79 (13) | C13—C12—C11 | 122.05 (13) |
C5—C4—Cl1 | 117.97 (11) | C13—C12—Cl2 | 117.98 (12) |
C3—C4—Cl1 | 120.23 (11) | C11—C12—Cl2 | 119.97 (11) |
C6—C5—C4 | 120.02 (13) | C14—C13—C12 | 120.01 (14) |
C6—C5—H5A | 120.0 | C14—C13—H13A | 120.0 |
C4—C5—H5A | 120.0 | C12—C13—H13A | 120.0 |
C5—C6—C1 | 119.14 (13) | C13—C14—C9 | 118.97 (14) |
C5—C6—H6A | 120.4 | C13—C14—H14A | 120.5 |
C1—C6—H6A | 120.4 | C9—C14—H14A | 120.5 |
C3—C7—C8 | 111.60 (13) | C11—C15—C16 | 112.21 (13) |
C3—C7—H7A | 109.3 | C11—C15—H15A | 109.2 |
C8—C7—H7A | 109.3 | C16—C15—H15A | 109.2 |
C3—C7—H7B | 109.3 | C11—C15—H15B | 109.2 |
C8—C7—H7B | 109.3 | C16—C15—H15B | 109.2 |
H7A—C7—H7B | 108.0 | H15A—C15—H15B | 107.9 |
C7—C8—H8A | 109.5 | C15—C16—H16A | 109.5 |
C7—C8—H8B | 109.5 | C15—C16—H16B | 109.5 |
H8A—C8—H8B | 109.5 | H16A—C16—H16B | 109.5 |
C7—C8—H8C | 109.5 | C15—C16—H16C | 109.5 |
H8A—C8—H8C | 109.5 | H16A—C16—H16C | 109.5 |
H8B—C8—H8C | 109.5 | H16B—C16—H16C | 109.5 |
O1—C1—C2—C3 | 178.12 (13) | O2—C9—C10—C11 | −178.90 (13) |
C6—C1—C2—C3 | −0.8 (2) | C14—C9—C10—C11 | 1.0 (2) |
C1—C2—C3—C4 | 0.8 (2) | C9—C10—C11—C12 | −0.1 (2) |
C1—C2—C3—C7 | 178.38 (13) | C9—C10—C11—C15 | −178.34 (13) |
C2—C3—C4—C5 | −0.2 (2) | C10—C11—C12—C13 | −0.6 (2) |
C7—C3—C4—C5 | −177.72 (14) | C15—C11—C12—C13 | 177.52 (14) |
C2—C3—C4—Cl1 | −179.38 (11) | C10—C11—C12—Cl2 | 179.89 (11) |
C7—C3—C4—Cl1 | 3.11 (19) | C15—C11—C12—Cl2 | −2.0 (2) |
C3—C4—C5—C6 | −0.3 (2) | C11—C12—C13—C14 | 0.5 (2) |
Cl1—C4—C5—C6 | 178.84 (11) | Cl2—C12—C13—C14 | −179.95 (12) |
C4—C5—C6—C1 | 0.3 (2) | C12—C13—C14—C9 | 0.3 (2) |
O1—C1—C6—C5 | −178.70 (14) | O2—C9—C14—C13 | 178.84 (13) |
C2—C1—C6—C5 | 0.2 (2) | C10—C9—C14—C13 | −1.1 (2) |
C2—C3—C7—C8 | −96.30 (16) | C12—C11—C15—C16 | −81.06 (19) |
C4—C3—C7—C8 | 81.14 (18) | C10—C11—C15—C16 | 97.03 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O1i | 0.81 | 1.97 | 2.708 (3) | 152 |
O1—H1A···O2i | 0.81 | 1.86 | 2.6642 (17) | 171 |
O2—H2···O1i | 0.81 | 1.86 | 2.6642 (17) | 168 |
O2—H2A···O2ii | 0.82 | 1.91 | 2.704 (2) | 166 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···O1i | 0.81 | 1.97 | 2.708 (3) | 151.7 |
O1—H1A···O2i | 0.81 | 1.86 | 2.6642 (17) | 170.8 |
O2—H2···O1i | 0.81 | 1.86 | 2.6642 (17) | 168.4 |
O2—H2A···O2ii | 0.82 | 1.91 | 2.704 (2) | 166.3 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+1, −y, −z+1. |
Acknowledgements
This work was supported by Vassar College. X-ray facilities were provided by the US National Science Foundation (grant No. 0521237 to JMT).
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
4-Chloro-3-ethylphenol, the title compound, can be synthesized by chlorination of 3-ethylphenol by SO2Cl2 in the presence of FeCl3 in CCl4 (Awano et al., 1987) or by adding the hydroxyl group to 1-ethyl-2-nitrobenzene followed by an acidic workup and a Sandmeyer reaction with CuCl (Schroetter et al., 1977). The title compound has been found to be useful in multiple biological applications, including testing the contracture in malignant hypothermia skeletal tissue (Low et al., 1997) and in biological activity on Ca2+ deposits in muscle cells (Gerbershagen et al., 2005).
The two independent molecules of the title compound in the asymmetric unit (Fig. 1) exhibit C—Cl bond lengths of 1.7430 (15) and 1.7469 (15) Å, and C—O bond lengths of 1.3751 (18) and 1.3778 (17) Å, respectively. These are in very close agreement with analogous bond lengths in the stuctures of 4-chlorophenol (Oswald et al., 2005), 4-chloro-3-methylphenol (Cox, 2003), and 4-chloro-3,5-dimethylphenol (Cox, 1995). The ethyl group is rotated nearly perpendicular to the plane of the ring for each independent molecule, displaying very similar torsion angles of 81.14 (18)° (C4—C3—C7—C8) and -81.06 (19)° (C12—C11—C15—C16). The structure forms a one-dimensional O—H···O hydrogen-bonded chain through the phenol groups, in which the phenol protons are 50% rotationally disordered (Fig. 2). These chains run parallel to the crystallographic b-axis. Each independent molecule forms hydrogen bonds with a neighboring equivalent independent molecule, with an oxygen–oxygen distance (O1···O1i) of 2.708 (3) Å and an oxygen–oxygen distance (O2···O2ii) of 2.704 (2) Å [for symmetry codes (i) and (ii), see Table 1]. These pairwise dimers are hydrogen-bonded to one another resulting in a third unique hydrogen bond, (O1···O2i), with length 2.6642 (17) Å. A similar hydrogen-bonding motif is found in the ordered one-dimensional hydrogen bonding chain in the structure of 4-chloro-3-methylphenol (Cox, 2003), where the O···O distances are similar at 2.711 (2) and 2.714 (2) Å. Unlike 4-chloro-3-methylphenol, where the planes of the aromatic units on each side of the hydrogen-bonded chain are parallel, in the the title compound they form a herringbone (edge-to-face or T) motif.
Neighboring hydrogen-bonded chains pack together in the solid state to form a two-dimensional sheet parallel to the 0 0 1 plane via an offset face-to-face π-stacking interaction of one of the two independent molecules, whereas the other molecule does not engage in π-stacking (Fig. 3). The π-stacking is characterized by a centroid-to-centroid distance of 3.580 (1) Å, a plane-to-centroid distance of 3.410 (1) Å, and a ring offset or ring-slipage distance of 1.092 (3) Å (Lueckheide et al., 2013). Neighboring sheets are further linked by a short intermolecular chlorine–chlorine contact (Cl1···Cl2iii) of 3.412 (1) Å, which is less than the sum of the van der Waals radii of 3.50 Å for chlorine–chlorine interactions (Pedireddi et al., 1994). For symmetry code (iii): -x, -y + 1, -z.