organic compounds
(2E)-1-(3-Chlorophenyl)-3-(4-chlorophenyl)prop-2-en-1-one
aDepartment of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA, bDepartment of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA, cDepartment of Studies in Chemistry, Mangalore University, Manalaganotri 574 199, India, and dDepartment of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India
*Correspondence e-mail: rbutcher99@yahoo.com
The title compound, C15H10Cl2O, is a chalcone with 3-chlorophenyl and 4-chlorophenyl substituents bonded at the opposite ends of a propenone group, the biologically active region. The dihedral angle between mean planes of these two chloro-substituted benzene rings is 46.7 (7)° compared to 46.0 (1) and 32.4 (1)° in similar published sructures. The angles between the mean plane of the prop-2-en-1-one group and the mean planes of the 3-chlorophenyl and 4-chlorophenyl rings are 24.1 (2) and 29.63°, respectively. While no classical hydrogen bonds are present, weak intermolecular C—H⋯π-ring interactions are observed, which contribute to the stability of crystal packing.
Related literature
For the potential use of ). For the biological and pharmaceutical activity of see: Dimmock et al. (1999); Troeberg et al. (2000); Ram et al. (2000). For their applications as organic nonlinear optical materials, see: Sarojini et al. (2006). For the bis-(4-chlorophenyl) analog, see: Wang et al. (2005) and for the (2-chlorophenyl, 4-chlorophenyl) analog, see: Fun et al. (2008b). For antitumor and antioxidant activity studies and non-linear optical studies, see: Mukherjee et al. (2001); Poornesh et al. (2009); Shettigar et al. (2006, 2008); Wang et al. (1997). For related structures, see: Butcher et al. (2007); Fischer et al. (2007); Fun et al. (2008a); Harrison et al. (2006); Ng et al. (2006); Teh et al. (2007); Yathirajan et al. (2006).
or chalcone-rich plant extracts as drugs or food preservatives, see: Dhar (1981Experimental
Crystal data
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Refinement
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Data collection: CrysAlis Pro (Oxford Diffraction, 2007); cell CrysAlis RED (Oxford Diffraction, 2007); data reduction: CrysAlis RED; 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.
Supporting information
https://doi.org/10.1107/S1600536809037805/zs2009sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809037805/zs2009Isup2.hkl
50% KOH was added to a mixture of 3-chloroacetophenone (0.01 mol) and p-chlorobenzaldehyde (0.01 mol) in 25 ml of ethanol. The mixture was stirred for an hour at room temperature and the precipitate was collected by filtration and purified by recrystallization from ethanol: yield 70% . Single crystals (m.p. 406–408 K) were grown from ethyl acetate by the slow evaporation method. Anal. found: C, 64.96; H, 3.61%; calc. for C15H10Cl2O: C 65.01; H, 3.64%.
All of the H atoms were placed in their calculated positions and then refined using the riding model with C—H = 0.95 Å, and with Uiso(H) = 1.17–1.24Ueq(C).
Chalcones or 1,3-diaryl-2-propen-1-ones, belong to the flavonoid family. Chemically, they consist of open-chain α, β-unsaturated carbonyl system. A vast number of naturally occurring are polyhydroxylated in the aryl rings. The radical quenching properties of the phenolic groups present in many have raised interest in using the compounds or chalcone-rich plant extracts as drugs or food preservatives (Dhar, 1981). Among the many useful properties that have been reported to possess include anti-inflammatory, antimicrobial, antifungal, antioxidant, cytotoxic and anticancer activities (Dimmock et al., 1999). Many have been assessed for their high antimalarial activity, which is probably a result of Michael addition of nucleophilic species to the double bond of the enone (Troeberg et al., 2000; Ram et al., 2000). are also finding applications as organic non-linear optical (NLO) materials due to their good SHG conversion efficiencies (Sarojini et al., 2006). Owing to the importance of these flavanoid analogs, the title chalcone (I), C15H10Cl2O has been synthesized and its is reported here.
in which the two aromatic rings are joined by a three-carbonThe title compound is a chalcone with 3-chlorophenyl and 4-chlorophenyl rings bonded at the opposite ends of a propenone group which is the biologically active region. The dihedral angle between mean planes of these two chloro-substituted benzene rings is 46.7 (7)° compared to 46.0 (1)° in the bis-(4-chlorophenyl) analog (Wang et al., 2005) and 32.4 (1)° in the (2-chlorophenyl, 4-chlorophenyl) analog (Fun et al., 2008b). The angles between the mean plane of the prop-2-ene-1-one group and the mean planes of the 3-chlorophenyl and 4-chlorophenyl rings are 24.1 (2)° and 29.63°, respectively. While no classical hydrogen bonds are present, weak intermolecular C–H···π-ring interactions are observed which contribute to the stability of crystal packing (Table 1).
For the potential use of
or chalcone-rich plant extracts as drugs or food preservatives, see: Dhar (1981). For the biological and pharmaceutical activity of see: Dimmock et al. (1999); Troeberg et al. (2000); Ram et al. (2000). For their applications as organic non-linear optical materials, see: Sarojini et al. (2006). For the bis-(4-chlorophenyl) analog, see: Wang et al. (2005) and for the (2-chlorophenyl, 4-chlorophenyl) analog, see: Fun et al. (2008b). For related literature [on what subjects?], see: Mukherjee et al. (2001); Poornesh et al. (2009); Shettigar et al. (2006, 2008); Wang et al. (1997). For related structures, see: Butcher et al. (2007); Fischer et al. (2007); Fun et al. (2008a); Harrison et al. (2006); Ng et al. (2006); Teh et al. (2007); Yathirajan et al. (2006). Cg1 is the centroid of the C1–C6 ring and Cg2 is the centroid of the C10–C15 ring.Data collection: CrysAlis PRO (Oxford Diffraction, 2007); cell
CrysAlis RED (Oxford Diffraction, 2007); data reduction: CrysAlis RED (Oxford Diffraction, 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).C15H10Cl2O | Z = 2 |
Mr = 277.13 | F(000) = 284 |
Triclinic, P1 | Dx = 1.499 Mg m−3 |
Hall symbol: -P 1 | Melting point = 406–408 K |
a = 5.8884 (9) Å | Cu Kα radiation, λ = 1.54184 Å |
b = 7.3328 (9) Å | Cell parameters from 2900 reflections |
c = 14.6752 (16) Å | θ = 6.2–73.9° |
α = 102.821 (10)° | µ = 4.61 mm−1 |
β = 95.003 (10)° | T = 110 K |
γ = 92.933 (11)° | Block, colorless |
V = 613.88 (14) Å3 | 0.53 × 0.33 × 0.28 mm |
Oxford Diffraction Gemini R CCD diffractometer | 2402 independent reflections |
Radiation source: Enhance (Cu) X-ray Source | 2147 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.035 |
Detector resolution: 10.5081 pixels mm-1 | θmax = 73.9°, θmin = 6.2° |
ω scans | h = −7→7 |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2007) | k = −4→9 |
Tmin = 0.067, Tmax = 0.275 | l = −18→18 |
4041 measured reflections |
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)] = 0.047 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.133 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0992P)2 + 0.1931P] where P = (Fo2 + 2Fc2)/3 |
2402 reflections | (Δ/σ)max < 0.001 |
163 parameters | Δρmax = 0.48 e Å−3 |
0 restraints | Δρmin = −0.39 e Å−3 |
C15H10Cl2O | γ = 92.933 (11)° |
Mr = 277.13 | V = 613.88 (14) Å3 |
Triclinic, P1 | Z = 2 |
a = 5.8884 (9) Å | Cu Kα radiation |
b = 7.3328 (9) Å | µ = 4.61 mm−1 |
c = 14.6752 (16) Å | T = 110 K |
α = 102.821 (10)° | 0.53 × 0.33 × 0.28 mm |
β = 95.003 (10)° |
Oxford Diffraction Gemini R CCD diffractometer | 2402 independent reflections |
Absorption correction: multi-scan (CrysAlis PRO; Oxford Diffraction, 2007) | 2147 reflections with I > 2σ(I) |
Tmin = 0.067, Tmax = 0.275 | Rint = 0.035 |
4041 measured reflections |
R[F2 > 2σ(F2)] = 0.047 | 0 restraints |
wR(F2) = 0.133 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.48 e Å−3 |
2402 reflections | Δρmin = −0.39 e Å−3 |
163 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 | ||
Cl1 | 0.57079 (8) | −0.05763 (7) | 0.10784 (3) | 0.0235 (2) | |
Cl2 | −0.09011 (9) | 0.72931 (8) | 0.93921 (3) | 0.0286 (2) | |
O1 | 0.7088 (2) | 0.2250 (2) | 0.47821 (10) | 0.0233 (4) | |
C1 | 0.3892 (3) | 0.1004 (3) | 0.36950 (14) | 0.0161 (4) | |
C2 | 0.5165 (3) | 0.0748 (3) | 0.29158 (14) | 0.0154 (4) | |
H2A | 0.6696 | 0.1269 | 0.2980 | 0.019* | |
C3 | 0.4159 (3) | −0.0275 (3) | 0.20525 (14) | 0.0164 (4) | |
C4 | 0.1936 (4) | −0.1087 (3) | 0.19394 (15) | 0.0203 (4) | |
H4A | 0.1276 | −0.1790 | 0.1343 | 0.024* | |
C5 | 0.0704 (3) | −0.0849 (3) | 0.27143 (15) | 0.0198 (4) | |
H5A | −0.0810 | −0.1409 | 0.2649 | 0.024* | |
C6 | 0.1652 (3) | 0.0201 (3) | 0.35873 (14) | 0.0179 (4) | |
H6A | 0.0777 | 0.0371 | 0.4110 | 0.021* | |
C7 | 0.5008 (3) | 0.2095 (3) | 0.46235 (14) | 0.0177 (4) | |
C8 | 0.3516 (3) | 0.2980 (3) | 0.53315 (14) | 0.0191 (4) | |
H8A | 0.1959 | 0.3100 | 0.5139 | 0.023* | |
C9 | 0.4301 (3) | 0.3613 (3) | 0.62341 (14) | 0.0169 (4) | |
H9A | 0.5857 | 0.3439 | 0.6403 | 0.020* | |
C10 | 0.3008 (3) | 0.4551 (3) | 0.69935 (14) | 0.0161 (4) | |
C11 | 0.3922 (3) | 0.4779 (3) | 0.79294 (14) | 0.0174 (4) | |
H11A | 0.5390 | 0.4357 | 0.8058 | 0.021* | |
C12 | 0.2738 (3) | 0.5603 (3) | 0.86707 (14) | 0.0202 (4) | |
H12A | 0.3365 | 0.5729 | 0.9302 | 0.024* | |
C13 | 0.0614 (4) | 0.6243 (3) | 0.84698 (14) | 0.0189 (4) | |
C14 | −0.0325 (3) | 0.6083 (3) | 0.75532 (14) | 0.0177 (4) | |
H14A | −0.1765 | 0.6555 | 0.7430 | 0.021* | |
C15 | 0.0860 (3) | 0.5226 (3) | 0.68181 (14) | 0.0167 (4) | |
H15A | 0.0213 | 0.5094 | 0.6189 | 0.020* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0286 (3) | 0.0275 (3) | 0.0145 (3) | 0.0029 (2) | 0.0075 (2) | 0.0028 (2) |
Cl2 | 0.0267 (3) | 0.0389 (4) | 0.0174 (3) | 0.0087 (2) | 0.0064 (2) | −0.0026 (2) |
O1 | 0.0188 (7) | 0.0308 (9) | 0.0191 (7) | 0.0014 (6) | 0.0024 (6) | 0.0028 (6) |
C1 | 0.0191 (9) | 0.0144 (9) | 0.0156 (10) | 0.0038 (7) | 0.0033 (7) | 0.0041 (7) |
C2 | 0.0154 (9) | 0.0139 (9) | 0.0177 (10) | 0.0025 (7) | 0.0025 (7) | 0.0045 (7) |
C3 | 0.0193 (10) | 0.0154 (9) | 0.0154 (9) | 0.0045 (7) | 0.0053 (7) | 0.0035 (7) |
C4 | 0.0231 (10) | 0.0164 (10) | 0.0196 (10) | 0.0005 (8) | −0.0013 (8) | 0.0017 (8) |
C5 | 0.0162 (9) | 0.0168 (10) | 0.0264 (11) | −0.0002 (8) | 0.0005 (8) | 0.0063 (8) |
C6 | 0.0169 (9) | 0.0189 (10) | 0.0201 (10) | 0.0038 (8) | 0.0066 (7) | 0.0067 (8) |
C7 | 0.0205 (10) | 0.0182 (10) | 0.0160 (10) | 0.0031 (8) | 0.0048 (7) | 0.0055 (8) |
C8 | 0.0193 (10) | 0.0214 (10) | 0.0167 (10) | 0.0041 (8) | 0.0049 (7) | 0.0029 (8) |
C9 | 0.0181 (9) | 0.0142 (9) | 0.0194 (10) | 0.0007 (7) | 0.0053 (7) | 0.0047 (8) |
C10 | 0.0182 (10) | 0.0132 (9) | 0.0168 (10) | −0.0016 (7) | 0.0038 (7) | 0.0031 (7) |
C11 | 0.0183 (10) | 0.0147 (10) | 0.0183 (10) | −0.0002 (7) | 0.0010 (7) | 0.0026 (7) |
C12 | 0.0230 (10) | 0.0213 (10) | 0.0148 (9) | 0.0004 (8) | 0.0007 (7) | 0.0015 (8) |
C13 | 0.0216 (10) | 0.0174 (10) | 0.0167 (10) | −0.0002 (8) | 0.0067 (8) | 0.0006 (7) |
C14 | 0.0169 (9) | 0.0150 (10) | 0.0211 (10) | 0.0006 (7) | 0.0033 (7) | 0.0036 (8) |
C15 | 0.0194 (10) | 0.0162 (10) | 0.0142 (9) | −0.0004 (8) | 0.0014 (7) | 0.0034 (7) |
Cl1—C3 | 1.7414 (19) | C8—C9 | 1.335 (3) |
Cl2—C13 | 1.743 (2) | C8—H8A | 0.9500 |
O1—C7 | 1.221 (2) | C9—C10 | 1.469 (3) |
C1—C6 | 1.398 (3) | C9—H9A | 0.9500 |
C1—C2 | 1.405 (3) | C10—C11 | 1.401 (3) |
C1—C7 | 1.495 (3) | C10—C15 | 1.405 (3) |
C2—C3 | 1.386 (3) | C11—C12 | 1.385 (3) |
C2—H2A | 0.9500 | C11—H11A | 0.9500 |
C3—C4 | 1.391 (3) | C12—C13 | 1.389 (3) |
C4—C5 | 1.385 (3) | C12—H12A | 0.9500 |
C4—H4A | 0.9500 | C13—C14 | 1.386 (3) |
C5—C6 | 1.393 (3) | C14—C15 | 1.386 (3) |
C5—H5A | 0.9500 | C14—H14A | 0.9500 |
C6—H6A | 0.9500 | C15—H15A | 0.9500 |
C7—C8 | 1.480 (3) | ||
C6—C1—C2 | 119.42 (18) | C7—C8—H8A | 119.1 |
C6—C1—C7 | 122.00 (17) | C8—C9—C10 | 126.68 (19) |
C2—C1—C7 | 118.57 (17) | C8—C9—H9A | 116.7 |
C3—C2—C1 | 119.19 (17) | C10—C9—H9A | 116.7 |
C3—C2—H2A | 120.4 | C11—C10—C15 | 118.27 (19) |
C1—C2—H2A | 120.4 | C11—C10—C9 | 119.40 (18) |
C2—C3—C4 | 121.81 (18) | C15—C10—C9 | 122.33 (18) |
C2—C3—Cl1 | 119.60 (15) | C12—C11—C10 | 121.58 (19) |
C4—C3—Cl1 | 118.59 (16) | C12—C11—H11A | 119.2 |
C5—C4—C3 | 118.61 (19) | C10—C11—H11A | 119.2 |
C5—C4—H4A | 120.7 | C11—C12—C13 | 118.49 (19) |
C3—C4—H4A | 120.7 | C11—C12—H12A | 120.8 |
C4—C5—C6 | 120.93 (18) | C13—C12—H12A | 120.8 |
C4—C5—H5A | 119.5 | C14—C13—C12 | 121.62 (19) |
C6—C5—H5A | 119.5 | C14—C13—Cl2 | 119.12 (16) |
C5—C6—C1 | 120.02 (18) | C12—C13—Cl2 | 119.25 (16) |
C5—C6—H6A | 120.0 | C15—C14—C13 | 119.30 (19) |
C1—C6—H6A | 120.0 | C15—C14—H14A | 120.4 |
O1—C7—C8 | 121.66 (19) | C13—C14—H14A | 120.4 |
O1—C7—C1 | 120.42 (18) | C14—C15—C10 | 120.71 (18) |
C8—C7—C1 | 117.93 (17) | C14—C15—H15A | 119.6 |
C9—C8—C7 | 121.72 (19) | C10—C15—H15A | 119.6 |
C9—C8—H8A | 119.1 | ||
C6—C1—C2—C3 | 1.0 (3) | C1—C7—C8—C9 | 164.85 (19) |
C7—C1—C2—C3 | 179.45 (17) | C7—C8—C9—C10 | 178.46 (18) |
C1—C2—C3—C4 | −1.3 (3) | C8—C9—C10—C11 | 166.7 (2) |
C1—C2—C3—Cl1 | 179.19 (14) | C8—C9—C10—C15 | −12.9 (3) |
C2—C3—C4—C5 | 0.4 (3) | C15—C10—C11—C12 | 1.6 (3) |
Cl1—C3—C4—C5 | 179.94 (15) | C9—C10—C11—C12 | −178.04 (17) |
C3—C4—C5—C6 | 0.8 (3) | C10—C11—C12—C13 | −1.2 (3) |
C4—C5—C6—C1 | −1.1 (3) | C11—C12—C13—C14 | −0.4 (3) |
C2—C1—C6—C5 | 0.2 (3) | C11—C12—C13—Cl2 | −179.77 (15) |
C7—C1—C6—C5 | −178.20 (18) | C12—C13—C14—C15 | 1.4 (3) |
C6—C1—C7—O1 | 155.76 (19) | Cl2—C13—C14—C15 | −179.14 (14) |
C2—C1—C7—O1 | −22.7 (3) | C13—C14—C15—C10 | −1.0 (3) |
C6—C1—C7—C8 | −24.7 (3) | C11—C10—C15—C14 | −0.4 (3) |
C2—C1—C7—C8 | 156.89 (18) | C9—C10—C15—C14 | 179.15 (17) |
O1—C7—C8—C9 | −15.6 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2A···Cg2i | 0.95 | 2.98 | 3.608 (2) | 125 |
C5—H5A···Cg2ii | 0.95 | 2.88 | 3.488 (2) | 126 |
C14—H14A···Cg1iii | 0.95 | 2.77 | 3.474 (2) | 131 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x, −y, −z+1; (iii) −x, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C15H10Cl2O |
Mr | 277.13 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 110 |
a, b, c (Å) | 5.8884 (9), 7.3328 (9), 14.6752 (16) |
α, β, γ (°) | 102.821 (10), 95.003 (10), 92.933 (11) |
V (Å3) | 613.88 (14) |
Z | 2 |
Radiation type | Cu Kα |
µ (mm−1) | 4.61 |
Crystal size (mm) | 0.53 × 0.33 × 0.28 |
Data collection | |
Diffractometer | Oxford Diffraction Gemini R CCD |
Absorption correction | Multi-scan (CrysAlis PRO; Oxford Diffraction, 2007) |
Tmin, Tmax | 0.067, 0.275 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4041, 2402, 2147 |
Rint | 0.035 |
(sin θ/λ)max (Å−1) | 0.623 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.047, 0.133, 1.04 |
No. of reflections | 2402 |
No. of parameters | 163 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.48, −0.39 |
Computer programs: CrysAlis PRO (Oxford Diffraction, 2007), CrysAlis RED (Oxford Diffraction, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2A···Cg2i | 0.95 | 2.98 | 3.608 (2) | 125 |
C5—H5A···Cg2ii | 0.95 | 2.88 | 3.488 (2) | 126 |
C14—H14A···Cg1iii | 0.95 | 2.77 | 3.474 (2) | 131 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x, −y, −z+1; (iii) −x, −y+1, −z+1. |
Acknowledgements
KV thanks the UGC for the award of a Junior Research Fellowship and for an SAP Chemical grant. RJB acknowledges the NSF MRI program (grant No. CHE-0619278) for funds to purchase an X-ray diffractometer.
References
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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.
Chalcones or 1,3-diaryl-2-propen-1-ones, belong to the flavonoid family. Chemically, they consist of open-chain flavonoids in which the two aromatic rings are joined by a three-carbon α, β-unsaturated carbonyl system. A vast number of naturally occurring chalcones are polyhydroxylated in the aryl rings. The radical quenching properties of the phenolic groups present in many chalcones have raised interest in using the compounds or chalcone-rich plant extracts as drugs or food preservatives (Dhar, 1981). Among the many useful properties that chalcones have been reported to possess include anti-inflammatory, antimicrobial, antifungal, antioxidant, cytotoxic and anticancer activities (Dimmock et al., 1999). Many chalcones have been assessed for their high antimalarial activity, which is probably a result of Michael addition of nucleophilic species to the double bond of the enone (Troeberg et al., 2000; Ram et al., 2000). Chalcones are also finding applications as organic non-linear optical (NLO) materials due to their good SHG conversion efficiencies (Sarojini et al., 2006). Owing to the importance of these flavanoid analogs, the title chalcone (I), C15H10Cl2O has been synthesized and its crystal structure is reported here.
The title compound is a chalcone with 3-chlorophenyl and 4-chlorophenyl rings bonded at the opposite ends of a propenone group which is the biologically active region. The dihedral angle between mean planes of these two chloro-substituted benzene rings is 46.7 (7)° compared to 46.0 (1)° in the bis-(4-chlorophenyl) analog (Wang et al., 2005) and 32.4 (1)° in the (2-chlorophenyl, 4-chlorophenyl) analog (Fun et al., 2008b). The angles between the mean plane of the prop-2-ene-1-one group and the mean planes of the 3-chlorophenyl and 4-chlorophenyl rings are 24.1 (2)° and 29.63°, respectively. While no classical hydrogen bonds are present, weak intermolecular C–H···π-ring interactions are observed which contribute to the stability of crystal packing (Table 1).