organic compounds
(E)-2,4-Dichloro-6-{1-[(2-chloroethyl)imino]ethyl}phenol
aCollege of Chemical and Environment Engineering, Chongqing Three Gorges University, Chongqing 404100, People's Republic of China, bShandong University of Traditional Chinese Medicine, Jinan 250355, People's Republic of China, cEditorial Department of College Journal, Chongqing Three Gorges University, Chongqing 404100, People's Republic of China, and dSchool of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People's Republic of China
*Correspondence e-mail: yshxl@yahoo.com.cn
The title Schiff base compound, C10H10Cl3NO, was prepared by the condensation of 1-(3,5-dichloro-2-hydroxyphenyl)ethanone with chloroethylamine. The imine adopts an E configuration with respect to the C=N bond. The H atom of the phenolic OH group is disordered over two positions with site occupation factors of 0.52 (7) and 0.48 (7), respectively, and the major occupancy component is involved in an intramolecular N—H⋯O hydrogen bond. The compound therefore exists in an iminium–phenolate as well as in the imino–phenol form. In the crystal, molecules are connected by C—H⋯O and C—H⋯Cl hydrogen bonds and Cl⋯Cl interactions [3.7864 (9) Å] into a three-dimensional network. In addition, intermolecular π–π stacking interactions [centroid–centroid distance = 4.4312 (9) Å] are observed.
Related literature
For a related structure, see: Wang et al. (2010). For applications of Schiff base ligands, see: Yin et al. (2004); Böhme & Günther (2007).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2005); cell SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
https://doi.org/10.1107/S160053681004448X/im2238sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681004448X/im2238Isup2.hkl
To a mixture of 1-(3,5-dichloro-2-hydroxy-phenyl)-ethanone (5.1 g, 25 mmol) and chloroethylamine hydrochloride (5.8 g, 50 mmol) in ethanol (150 ml) was added triethylamine (5.1 g, 50 mmol). The mixture was heated to reflux for 10 min. After being cooled to room temperature, the resulting precipitate was filtrated and washed with water to afford the product, E-2,4-dichloro-6-(1-(2-chloroethylimino)ethyl)phenol in 84% yield. Crystals of the title compound suitable for X-ray diffraction were obtained by slow evaporation of a solution of the solid in ethyl acetate at room temperature for 7 d.
All H atoms at carbon were placed geometrically and refined using a riding model with C—H = 0.97 Å (for CH2 group), 0.96 Å (for CH3 group) and 0.93 Å (for aryl H atoms). The isotropic atomic displacement parameters of hydrogen atoms were set to 1.5 × Ueq (CH3) and 1.2 × Ueq (CH2, CarH) of the parent atoms. Positions of hydrogen atoms at N1 and O1 were taken from difference Fourier maps and were refined using PART instructions.
Schiff-base ligands have attracted much attention over the years, e.g. as ligands in organotin(IV) compounds owing to their anti-tumour activities (Yin et al., 2004), and in silicon complexes applied to the field of photovoltaic applications, as coloring material and due to their antimicrobial activity. (Böhme & Günther, 2007). We report here the
of the title Schiff-base ligand (Fig. 1).The molecular structure of the ligand is represented in Fig. 1. The bond lengths and angles are in eligible range. The C7—N1 and C9—N1 bond lengths of 1.290 (2), 1.460 (2) Å, respectively, conform to the value for a double and single bonds and they are comparable with the corresponding bond lengths in similar Schiff-base compounds (Wang et al., 2010). The hydrogen atom of the phenolic OH group is disordered over two positions with site occupation factors of 0.52 and 0.48, respectively. The compound therefore exists in an iminium-phenolate as well as in an imino-phenol form. The situation may be interpreted as the intramolecular protonation of the basic imine nitrogen by the acidic phenol group. In the crystal, molecules are connected by C—H···O, C—H···Cl (Table 1) and Cl···Cl interactions [Cl1···Cl2 distance = 3.7864 (9) Å for π–π interactions serve to stabilize the extended structure [Cg···Cg distance = 4.4312 (9) Å for x, -y + 1/2, z - 1/2 and x, -y + 1/2, z + 1/2 (The Cg is the centroid of the phenyl ring)].
-x + 1, -y + 1, -z; Cl2···Cl3 distance = 3.7709 (7) Å for -x + 2, y - 1/2, -z + 1/2; Cl2···Cl3 distance = 3.7789 (8) Å for -x + 2, -y + 1, -z] into a network (Fig. 2). In addition, weak intermolecularFor a related structure, see: Wang et al. (2010). For applications of Schiff base ligands, see: Yin et al. (2004); Böhme & Günther (2007).
Data collection: APEX2 (Bruker, 2005); cell
SAINT (Bruker, 2005); data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: publCIF (Westrip, 2010).C10H10Cl3NO | F(000) = 544 |
Mr = 266.54 | Dx = 1.539 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 2504 reflections |
a = 14.5710 (2) Å | θ = 2.4–25.9° |
b = 10.2323 (2) Å | µ = 0.77 mm−1 |
c = 7.7384 (1) Å | T = 296 K |
β = 94.376 (1)° | Plate, orange |
V = 1150.39 (3) Å3 | 0.38 × 0.19 × 0.07 mm |
Z = 4 |
Bruker APEXII CCD area-detector diffractometer | 2625 independent reflections |
Radiation source: fine-focus sealed tube | 1940 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.023 |
φ and ω scans | θmax = 27.5°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | h = −18→17 |
Tmin = 0.762, Tmax = 0.951 | k = −10→13 |
8253 measured reflections | l = −8→10 |
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)] = 0.033 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.091 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | w = 1/[σ2(Fo2) + (0.0452P)2 + 0.1559P] where P = (Fo2 + 2Fc2)/3 |
2625 reflections | (Δ/σ)max = 0.006 |
146 parameters | Δρmax = 0.25 e Å−3 |
2 restraints | Δρmin = −0.21 e Å−3 |
C10H10Cl3NO | V = 1150.39 (3) Å3 |
Mr = 266.54 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 14.5710 (2) Å | µ = 0.77 mm−1 |
b = 10.2323 (2) Å | T = 296 K |
c = 7.7384 (1) Å | 0.38 × 0.19 × 0.07 mm |
β = 94.376 (1)° |
Bruker APEXII CCD area-detector diffractometer | 2625 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 1940 reflections with I > 2σ(I) |
Tmin = 0.762, Tmax = 0.951 | Rint = 0.023 |
8253 measured reflections |
R[F2 > 2σ(F2)] = 0.033 | 2 restraints |
wR(F2) = 0.091 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | Δρmax = 0.25 e Å−3 |
2625 reflections | Δρmin = −0.21 e Å−3 |
146 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) | |
C1 | 0.57736 (13) | 0.15817 (19) | −0.1505 (2) | 0.0498 (4) | |
C2 | 0.61146 (13) | 0.0340 (2) | −0.1143 (2) | 0.0516 (5) | |
H2 | 0.5771 | −0.0395 | −0.1481 | 0.062* | |
C3 | 0.69659 (12) | 0.02119 (17) | −0.0279 (2) | 0.0455 (4) | |
C4 | 0.75065 (12) | 0.12988 (16) | 0.0289 (2) | 0.0401 (4) | |
C5 | 0.71381 (12) | 0.25627 (16) | −0.0117 (2) | 0.0388 (4) | |
C6 | 0.62665 (12) | 0.26726 (18) | −0.1027 (2) | 0.0458 (4) | |
H6 | 0.6026 | 0.3495 | −0.1303 | 0.055* | |
C7 | 0.76729 (12) | 0.37256 (16) | 0.0405 (2) | 0.0403 (4) | |
C8 | 0.73432 (14) | 0.50736 (18) | −0.0072 (3) | 0.0559 (5) | |
H8A | 0.6689 | 0.5122 | 0.0002 | 0.084* | |
H8B | 0.7487 | 0.5268 | −0.1235 | 0.084* | |
H8C | 0.7642 | 0.5696 | 0.0710 | 0.084* | |
C9 | 0.90715 (13) | 0.45820 (17) | 0.1910 (2) | 0.0491 (4) | |
H9A | 0.8749 | 0.5189 | 0.2611 | 0.059* | |
H9B | 0.9276 | 0.5057 | 0.0925 | 0.059* | |
C10 | 0.98893 (13) | 0.40380 (19) | 0.2962 (2) | 0.0509 (5) | |
H10A | 0.9682 | 0.3582 | 0.3961 | 0.061* | |
H10B | 1.0284 | 0.4752 | 0.3382 | 0.061* | |
Cl1 | 0.46922 (4) | 0.17442 (7) | −0.26165 (8) | 0.0791 (2) | |
Cl2 | 0.74236 (4) | −0.13318 (4) | 0.01161 (8) | 0.06643 (18) | |
Cl3 | 1.05345 (3) | 0.29415 (5) | 0.17400 (7) | 0.05817 (16) | |
N1 | 0.84464 (10) | 0.35378 (14) | 0.12961 (19) | 0.0418 (3) | |
H1N | 0.858 (3) | 0.271 (2) | 0.146 (5) | 0.049 (16)* | 0.52 (7) |
H1O | 0.855 (3) | 0.183 (3) | 0.145 (6) | 0.07 (2)* | 0.48 (7) |
O1 | 0.83069 (9) | 0.11256 (12) | 0.11379 (18) | 0.0494 (3) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0381 (10) | 0.0583 (11) | 0.0523 (10) | −0.0039 (9) | −0.0005 (8) | 0.0049 (9) |
C2 | 0.0472 (11) | 0.0491 (10) | 0.0583 (11) | −0.0119 (9) | 0.0041 (9) | −0.0039 (9) |
C3 | 0.0451 (10) | 0.0370 (9) | 0.0551 (10) | −0.0010 (8) | 0.0077 (8) | −0.0016 (7) |
C4 | 0.0392 (10) | 0.0368 (8) | 0.0450 (9) | −0.0005 (7) | 0.0069 (7) | −0.0006 (7) |
C5 | 0.0387 (9) | 0.0364 (8) | 0.0417 (9) | −0.0005 (7) | 0.0051 (7) | 0.0023 (7) |
C6 | 0.0421 (10) | 0.0449 (10) | 0.0506 (10) | 0.0042 (8) | 0.0041 (8) | 0.0077 (8) |
C7 | 0.0428 (10) | 0.0360 (8) | 0.0428 (9) | 0.0027 (7) | 0.0081 (7) | 0.0028 (7) |
C8 | 0.0577 (12) | 0.0382 (9) | 0.0709 (12) | 0.0041 (9) | −0.0014 (10) | 0.0076 (9) |
C9 | 0.0515 (11) | 0.0348 (8) | 0.0610 (11) | −0.0068 (8) | 0.0040 (9) | −0.0030 (8) |
C10 | 0.0561 (12) | 0.0511 (10) | 0.0450 (9) | −0.0121 (9) | 0.0002 (8) | −0.0071 (8) |
Cl1 | 0.0484 (3) | 0.0859 (4) | 0.0987 (4) | −0.0121 (3) | −0.0218 (3) | 0.0179 (3) |
Cl2 | 0.0629 (4) | 0.0339 (2) | 0.1020 (4) | 0.0003 (2) | 0.0030 (3) | −0.0027 (2) |
Cl3 | 0.0544 (3) | 0.0519 (3) | 0.0673 (3) | 0.0025 (2) | −0.0016 (2) | −0.0059 (2) |
N1 | 0.0448 (9) | 0.0310 (7) | 0.0493 (8) | −0.0020 (6) | 0.0019 (7) | −0.0003 (6) |
O1 | 0.0408 (7) | 0.0350 (7) | 0.0710 (8) | 0.0018 (6) | −0.0055 (6) | 0.0007 (6) |
C1—C6 | 1.363 (3) | C7—C8 | 1.498 (2) |
C1—C2 | 1.385 (3) | C8—H8A | 0.9600 |
C1—Cl1 | 1.7446 (19) | C8—H8B | 0.9600 |
C2—C3 | 1.370 (2) | C8—H8C | 0.9600 |
C2—H2 | 0.9300 | C9—N1 | 1.460 (2) |
C3—C4 | 1.413 (2) | C9—C10 | 1.498 (3) |
C3—Cl2 | 1.7326 (18) | C9—H9A | 0.9700 |
C4—O1 | 1.306 (2) | C9—H9B | 0.9700 |
C4—C5 | 1.426 (2) | C10—Cl3 | 1.781 (2) |
C5—C6 | 1.409 (2) | C10—H10A | 0.9700 |
C5—C7 | 1.462 (2) | C10—H10B | 0.9700 |
C6—H6 | 0.9300 | N1—H1N | 0.874 (19) |
C7—N1 | 1.290 (2) | O1—H1O | 0.827 (19) |
C6—C1—C2 | 121.53 (17) | C7—C8—H8B | 109.5 |
C6—C1—Cl1 | 119.55 (15) | H8A—C8—H8B | 109.5 |
C2—C1—Cl1 | 118.92 (15) | C7—C8—H8C | 109.5 |
C3—C2—C1 | 118.94 (17) | H8A—C8—H8C | 109.5 |
C3—C2—H2 | 120.5 | H8B—C8—H8C | 109.5 |
C1—C2—H2 | 120.5 | N1—C9—C10 | 110.83 (15) |
C2—C3—C4 | 122.61 (16) | N1—C9—H9A | 109.5 |
C2—C3—Cl2 | 119.69 (14) | C10—C9—H9A | 109.5 |
C4—C3—Cl2 | 117.69 (13) | N1—C9—H9B | 109.5 |
O1—C4—C3 | 120.31 (15) | C10—C9—H9B | 109.5 |
O1—C4—C5 | 122.71 (15) | H9A—C9—H9B | 108.1 |
C3—C4—C5 | 116.98 (15) | C9—C10—Cl3 | 112.06 (12) |
C6—C5—C4 | 119.49 (16) | C9—C10—H10A | 109.2 |
C6—C5—C7 | 120.94 (15) | Cl3—C10—H10A | 109.2 |
C4—C5—C7 | 119.56 (15) | C9—C10—H10B | 109.2 |
C1—C6—C5 | 120.43 (17) | Cl3—C10—H10B | 109.2 |
C1—C6—H6 | 119.8 | H10A—C10—H10B | 107.9 |
C5—C6—H6 | 119.8 | C7—N1—C9 | 124.26 (15) |
N1—C7—C5 | 116.87 (14) | C7—N1—H1N | 113 (3) |
N1—C7—C8 | 121.32 (16) | C9—N1—H1N | 122 (3) |
C5—C7—C8 | 121.82 (16) | C4—O1—H1O | 112 (4) |
C7—C8—H8A | 109.5 | ||
C6—C1—C2—C3 | 0.2 (3) | C2—C1—C6—C5 | −1.1 (3) |
Cl1—C1—C2—C3 | 179.64 (14) | Cl1—C1—C6—C5 | 179.53 (13) |
C1—C2—C3—C4 | 1.1 (3) | C4—C5—C6—C1 | 0.5 (3) |
C1—C2—C3—Cl2 | −177.60 (14) | C7—C5—C6—C1 | −179.91 (16) |
C2—C3—C4—O1 | 178.66 (16) | C6—C5—C7—N1 | 177.17 (15) |
Cl2—C3—C4—O1 | −2.6 (2) | C4—C5—C7—N1 | −3.3 (2) |
C2—C3—C4—C5 | −1.6 (3) | C6—C5—C7—C8 | −3.0 (3) |
Cl2—C3—C4—C5 | 177.17 (12) | C4—C5—C7—C8 | 176.56 (16) |
O1—C4—C5—C6 | −179.54 (15) | N1—C9—C10—Cl3 | 60.56 (18) |
C3—C4—C5—C6 | 0.7 (2) | C5—C7—N1—C9 | 179.36 (15) |
O1—C4—C5—C7 | 0.9 (3) | C8—C7—N1—C9 | −0.5 (3) |
C3—C4—C5—C7 | −178.81 (15) | C10—C9—N1—C7 | 177.78 (16) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1 | 0.88 (2) | 1.68 (2) | 2.479 (2) | 150 (4) |
C10—H10B···O1i | 0.97 | 2.48 | 3.416 (2) | 159 |
C10—H10A···Cl3ii | 0.97 | 2.86 | 3.621 (2) | 136 |
Symmetry codes: (i) −x+2, y+1/2, −z+1/2; (ii) x, −y+1/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C10H10Cl3NO |
Mr | 266.54 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 14.5710 (2), 10.2323 (2), 7.7384 (1) |
β (°) | 94.376 (1) |
V (Å3) | 1150.39 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.77 |
Crystal size (mm) | 0.38 × 0.19 × 0.07 |
Data collection | |
Diffractometer | Bruker APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.762, 0.951 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 8253, 2625, 1940 |
Rint | 0.023 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.033, 0.091, 1.02 |
No. of reflections | 2625 |
No. of parameters | 146 |
No. of restraints | 2 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.25, −0.21 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Bruker, 2005), SIR97 (Altomare et al., 1999), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O1 | 0.88 (2) | 1.68 (2) | 2.479 (2) | 150 (4) |
C10—H10B···O1i | 0.97 | 2.48 | 3.416 (2) | 159 |
C10—H10A···Cl3ii | 0.97 | 2.86 | 3.621 (2) | 136 |
Symmetry codes: (i) −x+2, y+1/2, −z+1/2; (ii) x, −y+1/2, z+1/2. |
Acknowledgements
This study was supported by the Natural Science Foundation of Shandong Province (Z2008B10).
References
Altomare, A., Burla, M. C., Camalli, M., Cascarano, G. L., Giacovazzo, C., Guagliardi, A., Moliterni, A. G. G., Polidori, G. & Spagna, R. (1999). J. Appl. Cryst. 32, 115–119. Web of Science CrossRef CAS IUCr Journals Google Scholar
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Bruker (2005). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
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Schiff-base ligands have attracted much attention over the years, e.g. as ligands in organotin(IV) compounds owing to their anti-tumour activities (Yin et al., 2004), and in silicon complexes applied to the field of photovoltaic applications, as coloring material and due to their antimicrobial activity. (Böhme & Günther, 2007). We report here the crystal structure of the title Schiff-base ligand (Fig. 1).
The molecular structure of the ligand is represented in Fig. 1. The bond lengths and angles are in eligible range. The C7—N1 and C9—N1 bond lengths of 1.290 (2), 1.460 (2) Å, respectively, conform to the value for a double and single bonds and they are comparable with the corresponding bond lengths in similar Schiff-base compounds (Wang et al., 2010). The hydrogen atom of the phenolic OH group is disordered over two positions with site occupation factors of 0.52 and 0.48, respectively. The compound therefore exists in an iminium-phenolate as well as in an imino-phenol form. The situation may be interpreted as the intramolecular protonation of the basic imine nitrogen by the acidic phenol group. In the crystal, molecules are connected by C—H···O, C—H···Cl (Table 1) and Cl···Cl interactions [Cl1···Cl2 distance = 3.7864 (9) Å for symmetry operation -x + 1, -y + 1, -z; Cl2···Cl3 distance = 3.7709 (7) Å for symmetry operation -x + 2, y - 1/2, -z + 1/2; Cl2···Cl3 distance = 3.7789 (8) Å for symmetry operation -x + 2, -y + 1, -z] into a network (Fig. 2). In addition, weak intermolecular π–π interactions serve to stabilize the extended structure [Cg···Cg distance = 4.4312 (9) Å for symmetry operation x, -y + 1/2, z - 1/2 and x, -y + 1/2, z + 1/2 (The Cg is the centroid of the phenyl ring)].