organic compounds
(E)-Methyl 3-(10-bromoanthracen-9-yl)acrylate
aInstitute of Inorganic Chemistry, University of Hamburg, Hamburg, Germany, bDepartment of Chemical Engineering, United Arab Emirates University, AL Ain, Abu Dhabi, United Arab Emirates, and cDepartment of Chemistry, United Arab Emirates University, AL Ain, Abu Dhabi, United Arab Emirates
*Correspondence e-mail: thies@uaeu.ac.ae
In the title molecule, C18H13BrO2, the anthracene unit forms an angle of 46.91 (2)° with the mean plane of the methyl acrylate moiety. In the crystal, the molecules arrange themselves into strands parallel to [010] and, due to the crystal symmetry, there are eight strands crossing the In each strand, molecules form short C—H⋯O and C—H⋯π contacts and have their anthracene groups parallel to each other. Neighboring strands, related by a c-glide operation, are connected via C—H⋯O interactions and form a layer parallel to (100). The arrangement of the acrylate and anthracene groups in the crystal do not allow for [2 + 2] or [4 + 4] cycloaddition.
Related literature
For an analogous preparation of the title compound, see: Bugenhagen et al. (2013); Nguyen & Weizman (2007). For crystal structures of photodimerizable aryl-enes, see: Vishnumurthy et al. (2002); Mascitti & Corey (2006); Sonoda (2011); Schmidt (1964). For the photodimerization of anthracenes in the crystal, see: Schmidt (1971); Ihmels et al. (2000). For the X-ray of a non-planar bromoanthracene, see: Barkhuizen et al. (2004).
Experimental
Crystal data
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Data collection: CrysAlis PRO (Agilent, 2013); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within OLEX2 (Dolomanov et al., 2009); molecular graphics: PLATON (Spek, 2009) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 and PLATON.
Supporting information
https://doi.org/10.1107/S1600536813016905/gk2574sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536813016905/gk2574Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536813016905/gk2574Isup3.cml
Methyl (E)-3-[10-bromoanthran-9-yl]-2-propenoate: to a solution of (E)-3-[10-bromoanthran-9-yl]-2-propenoic acid (875 mg, 2.68 mmol) in 1,2-dichloroethane (10 ml) was given an excess of thionyl chloride (1.0 g, 8.54 mmol), and the resulting mixture was kept at 70°C for 1.5 h. Thereafter, the ensuing solution was concentrated in vacuo. Thereafter, a solution of methanol (7 ml) in 1,2-dichloroethane (10 ml) was added, and the mixture was stirred at rt for 10 h. Then, it was concentrated in vacuo. The residue was taken up in dichloromethane (20 ml), extracted with water (2 X 10 ml), and dried over MgSO4. The solution was concentrated in vacuo, and the residue was subjected to
on silica gel (benzene-hexane 1:1) to give the title compound (847 mg, 93%) as a yellow solid; mp. 425 K; IR (KBr/cm-1) nmax 3066, 3021, 2950, 1711 (CO), 1631, 1436, 1338, 1315, 1254, 1203, 1180, 999, 900, 762, 749, 726; dH (400 MHz, CDCl3) 3.92 (3H, s, OCH3), 6.38 (1H, d, 3J = 16.0 Hz), 7.51 – 7.55 (2H, m), 7.59 – 7.63 (2H, m), 8.20 (2H, d, 3J = 8.8 Hz), 8.55 (1H, d, 3J = 16.0 Hz), 8.57 (2H, d, 3J = 7.6 Hz); dC (100.5 MHz, CDCl3) 52.0 (OCH3), 124.5 (Cquat), 125.7 (2 C, CH), 126.4 (2 C, CH), 127.2 (2 C, CH), 127.7 (CH), 128.4 (2 C, CH), 129.8 (2 C, Cquat), 130.1 (Cquat), 130.2 (2 C, Cquat), 142.0 (CH), 166.6 (Cquat, CO).All carbon-bound hydrogen atoms were placed in calculated positions with C—H distances of 0.93 - 0.96 Å and refined as riding with Uiso(H) =xUeq(C), where x = 1.5 for methyl and x = 1.2 for all other H-atoms.
In our interest in [2 + 2]-photocycloaddition of anthracene derivatives in the crystal (Sonoda, 2011; Schmidt, 1964), the authors grew single crystals of the title compound. The bromo atom (C2—Br1—C14 plane) deviates from the averaged plane of the anthracenyl unit (C1—C14) at an angle of 3.66 (2)°. This unusual deviation (Barkhuizen et al., 2004) may be due to the forced closeness of Br1 to the π system (C9—C14) of the underlying anthracenyl unit. Eight strands of molecules of the title compound cross the and propagate along [010] (Figure 3). The neighboring strands that are related by c-glide operation are connected via C5—H5···O2 interaction (Table 1) and form a layer parallel to (100). The close contacts C16—H16···O2 and C15—H15···Cg1 (π) (Table 1) link the neighboring molecules within each strand (Figure 2). The average plane of an anthracenyl unit of a molecule in one strand forms an angle of 78.37 (2)° with an anthracenyl unit of a molecule in the neighboring strand.While the anthracenyl units of the molecules in one strand are parallel to each other and exhibit an off-set that would be beneficial for π-π interaction, they are too far apart (distance between the averaged planes of the respective anthracenyl units: 3.362 (2) Å) to exhibit a strong π-π interaction, in contrast with the non-brominated parent compound (Bugenhagen et al., 2013).
The closest distance between double bonds of two molecules, which are molecules in one strand, is 5.321 (3) Å. Although this distance is smaller than the smallest distance found in the non-brominated parent compound (5.549 (3) Å) (Bugenhagen et al., 2013), it is larger than in many of those found for aryl-enes that undergo [2 + 2]-photodimerization readily (Vishnumurthy et al. 2002; Mascitti et al. 2006). The anthracenyl units themselves, while aligned parallel to each other in one strand, are off-set to each other and are much further apart (5.321 (3) Å for C1—C1 and C8—C8) than in anthracenes (less than 4.2 Å) that have been reported to undergo [4 + 4]-photodimerization in the crystal (Schmidt, 1971; Ihmels et al., 2000).
For an analogous preparation of the title compound, see: Bugenhagen et al. (2013); Nguyen & Weizman (2007). For crystal structures of photodimerizable aryl-enes, see: Vishnumurthy et al. (2002); Mascitti & Corey (2006); Sonoda (2011); Schmidt (1964). For the photodimerization of anthracenes in the crystal, see: Schmidt (1971); Ihmels et al. (2000). For the X-ray
of a non-planar bromoanthracene, see: Barkhuizen et al. (2004).Data collection: CrysAlis PRO (Agilent, 2013); cell
CrysAlis PRO (Agilent, 2013); data reduction: CrysAlis PRO (Agilent, 2013); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008) within OLEX2 (Dolomanov et al., 2009); molecular graphics: PLATON (Spek, 2009) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. A view of the title molecule with the atom-numbering scheme. Displacement ellipsoids are shown at the 50% probability level. | |
Fig. 2. The close contacts C—H···O and C—H···π between two molecules (colored in blue) in one strand, in addition to the C—H···O interaction between molecules of neighboring strands (related by c-glide operation). [Symmetry codes: (i) x,2 - y,-1/2 + z; (ii) x,1 + y,z; (iii) x,y,z; (iv) x,1 - y,1/2 + z] | |
Fig. 3. The eight strands crossing the unit cell and propagating along the b axis with C—H···O interaction between neighboring strands shown as dashed lines. |
C18H13BrO2 | Dx = 1.606 Mg m−3 |
Mr = 341.19 | Melting point: 425 K |
Orthorhombic, Pbcn | Cu Kα radiation, λ = 1.5418 Å |
a = 40.5848 (4) Å | Cell parameters from 13502 reflections |
b = 5.32093 (5) Å | θ = 4.3–76.3° |
c = 13.0710 (1) Å | µ = 3.98 mm−1 |
V = 2822.67 (5) Å3 | T = 100 K |
Z = 8 | Block, light yellow |
F(000) = 1376 | 0.21 × 0.19 × 0.13 mm |
Oxford Diffraction SuperNova, Dual, Cu at zero, Atlas diffractometer | 2961 independent reflections |
Radiation source: SuperNova (Cu) X-ray Source | 2900 reflections with I > 2σ(I) |
Mirror monochromator | Rint = 0.022 |
Detector resolution: 10.4127 pixels mm-1 | θmax = 76.3°, θmin = 4.4° |
ω scans | h = −50→44 |
Absorption correction: analytical (CrysAlis PRO; Agilent, 2013) | k = −5→6 |
Tmin = 0.891, Tmax = 0.924 | l = −15→16 |
25313 measured reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.026 | H-atom parameters constrained |
wR(F2) = 0.066 | w = 1/[σ2(Fo2) + (0.0253P)2 + 4.4132P] where P = (Fo2 + 2Fc2)/3 |
S = 1.12 | (Δ/σ)max = 0.003 |
2961 reflections | Δρmax = 0.31 e Å−3 |
191 parameters | Δρmin = −0.44 e Å−3 |
0 restraints |
C18H13BrO2 | V = 2822.67 (5) Å3 |
Mr = 341.19 | Z = 8 |
Orthorhombic, Pbcn | Cu Kα radiation |
a = 40.5848 (4) Å | µ = 3.98 mm−1 |
b = 5.32093 (5) Å | T = 100 K |
c = 13.0710 (1) Å | 0.21 × 0.19 × 0.13 mm |
Oxford Diffraction SuperNova, Dual, Cu at zero, Atlas diffractometer | 2961 independent reflections |
Absorption correction: analytical (CrysAlis PRO; Agilent, 2013) | 2900 reflections with I > 2σ(I) |
Tmin = 0.891, Tmax = 0.924 | Rint = 0.022 |
25313 measured reflections |
R[F2 > 2σ(F2)] = 0.026 | 0 restraints |
wR(F2) = 0.066 | H-atom parameters constrained |
S = 1.12 | Δρmax = 0.31 e Å−3 |
2961 reflections | Δρmin = −0.44 e Å−3 |
191 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. |
x | y | z | Uiso*/Ueq | ||
Br1 | 0.28462 (2) | 1.11853 (4) | 0.77185 (2) | 0.01637 (8) | |
C1 | 0.32116 (4) | 0.9076 (3) | 0.73973 (14) | 0.0125 (4) | |
C10 | 0.34022 (5) | 0.3729 (3) | 0.56492 (14) | 0.0143 (4) | |
C11 | 0.31165 (5) | 0.3554 (4) | 0.51014 (14) | 0.0159 (4) | |
C12 | 0.28558 (4) | 0.5263 (4) | 0.52784 (14) | 0.0157 (4) | |
C13 | 0.28813 (4) | 0.7045 (4) | 0.60248 (14) | 0.0141 (4) | |
C14 | 0.31732 (4) | 0.7266 (3) | 0.66306 (13) | 0.0121 (3) | |
C15 | 0.40212 (4) | 0.4163 (3) | 0.67191 (14) | 0.0132 (4) | |
C16 | 0.43266 (4) | 0.4937 (4) | 0.65111 (14) | 0.0145 (4) | |
C17 | 0.45923 (4) | 0.3109 (4) | 0.63028 (14) | 0.0147 (4) | |
C18 | 0.51645 (5) | 0.2672 (4) | 0.60385 (19) | 0.0263 (5) | |
C2 | 0.35047 (4) | 0.9392 (3) | 0.79499 (14) | 0.0122 (3) | |
C3 | 0.35474 (5) | 1.1300 (3) | 0.87078 (14) | 0.0144 (4) | |
C4 | 0.38315 (5) | 1.1478 (4) | 0.92569 (14) | 0.0165 (4) | |
C5 | 0.40887 (4) | 0.9717 (4) | 0.91069 (14) | 0.0160 (4) | |
C6 | 0.40616 (4) | 0.7915 (4) | 0.83732 (14) | 0.0148 (4) | |
C7 | 0.37738 (4) | 0.7705 (3) | 0.77405 (13) | 0.0119 (3) | |
C8 | 0.37435 (4) | 0.5854 (3) | 0.69716 (14) | 0.0120 (3) | |
C9 | 0.34444 (4) | 0.5594 (3) | 0.64271 (14) | 0.0120 (3) | |
H10 | 0.3573 | 0.2613 | 0.5514 | 0.017* | |
H11 | 0.3093 | 0.2304 | 0.4609 | 0.019* | |
H12 | 0.2666 | 0.5171 | 0.4883 | 0.019* | |
H13 | 0.2706 | 0.8133 | 0.6141 | 0.017* | |
H15 | 0.3980 | 0.2444 | 0.6704 | 0.016* | |
H16 | 0.4373 | 0.6648 | 0.6497 | 0.017* | |
H18A | 0.5146 | 0.1947 | 0.5368 | 0.039* | |
H18B | 0.5169 | 0.1357 | 0.6541 | 0.039* | |
H18C | 0.5364 | 0.3639 | 0.6081 | 0.039* | |
H3 | 0.3378 | 1.2440 | 0.8828 | 0.017* | |
H4 | 0.3857 | 1.2763 | 0.9733 | 0.020* | |
H5 | 0.4277 | 0.9793 | 0.9512 | 0.019* | |
H6 | 0.4234 | 0.6788 | 0.8279 | 0.018* | |
O1 | 0.48841 (3) | 0.4289 (3) | 0.62263 (12) | 0.0218 (3) | |
O2 | 0.45611 (3) | 0.0860 (3) | 0.62159 (11) | 0.0188 (3) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br1 | 0.01322 (11) | 0.01739 (12) | 0.01851 (12) | 0.00440 (7) | 0.00145 (7) | −0.00092 (7) |
C1 | 0.0115 (8) | 0.0126 (8) | 0.0134 (8) | 0.0022 (7) | 0.0032 (7) | 0.0026 (7) |
C10 | 0.0131 (8) | 0.0149 (9) | 0.0150 (8) | −0.0007 (7) | 0.0037 (7) | −0.0002 (7) |
C11 | 0.0174 (9) | 0.0177 (9) | 0.0126 (8) | −0.0038 (7) | 0.0028 (7) | −0.0025 (7) |
C12 | 0.0129 (8) | 0.0203 (10) | 0.0140 (9) | −0.0035 (7) | −0.0003 (7) | 0.0027 (8) |
C13 | 0.0115 (8) | 0.0151 (9) | 0.0155 (9) | 0.0000 (7) | 0.0014 (7) | 0.0039 (8) |
C14 | 0.0111 (8) | 0.0130 (8) | 0.0122 (8) | −0.0004 (7) | 0.0020 (6) | 0.0030 (7) |
C15 | 0.0141 (8) | 0.0119 (8) | 0.0137 (8) | 0.0019 (7) | −0.0009 (7) | −0.0001 (7) |
C16 | 0.0145 (8) | 0.0111 (8) | 0.0180 (9) | 0.0009 (7) | 0.0015 (7) | 0.0005 (7) |
C17 | 0.0118 (8) | 0.0175 (9) | 0.0149 (8) | −0.0002 (7) | −0.0009 (7) | −0.0021 (7) |
C18 | 0.0111 (9) | 0.0307 (12) | 0.0371 (12) | 0.0045 (8) | 0.0014 (8) | −0.0118 (10) |
C2 | 0.0119 (8) | 0.0121 (8) | 0.0126 (8) | −0.0005 (7) | 0.0024 (7) | 0.0030 (7) |
C3 | 0.0144 (8) | 0.0137 (9) | 0.0151 (9) | 0.0008 (7) | 0.0033 (7) | 0.0000 (7) |
C4 | 0.0189 (9) | 0.0173 (9) | 0.0134 (8) | −0.0037 (7) | 0.0027 (7) | −0.0017 (7) |
C5 | 0.0124 (8) | 0.0207 (10) | 0.0148 (8) | −0.0030 (7) | −0.0016 (7) | 0.0015 (8) |
C6 | 0.0117 (8) | 0.0161 (9) | 0.0167 (9) | 0.0009 (7) | 0.0005 (7) | 0.0022 (7) |
C7 | 0.0117 (8) | 0.0113 (8) | 0.0128 (8) | −0.0008 (7) | 0.0019 (6) | 0.0031 (7) |
C8 | 0.0114 (8) | 0.0109 (8) | 0.0138 (8) | 0.0005 (7) | 0.0021 (7) | 0.0032 (7) |
C9 | 0.0119 (8) | 0.0113 (8) | 0.0128 (8) | −0.0009 (7) | 0.0031 (6) | 0.0011 (7) |
O1 | 0.0098 (6) | 0.0199 (7) | 0.0356 (8) | −0.0004 (5) | 0.0041 (6) | −0.0088 (6) |
O2 | 0.0162 (6) | 0.0136 (7) | 0.0266 (7) | 0.0024 (5) | 0.0007 (6) | −0.0016 (6) |
C1—Br1 | 1.9068 (18) | C18—H18C | 0.9600 |
C1—C14 | 1.398 (3) | C18—H18B | 0.9600 |
C1—C2 | 1.402 (3) | C18—H18A | 0.9600 |
C10—C11 | 1.366 (3) | C2—C7 | 1.440 (2) |
C10—H10 | 0.9300 | C2—C3 | 1.429 (3) |
C11—C12 | 1.414 (3) | C3—C4 | 1.361 (3) |
C11—H11 | 0.9300 | C3—H3 | 0.9300 |
C12—C13 | 1.364 (3) | C4—C5 | 1.416 (3) |
C12—H12 | 0.9300 | C4—H4 | 0.9300 |
C13—C14 | 1.430 (2) | C5—C6 | 1.361 (3) |
C13—H13 | 0.9300 | C5—H5 | 0.9300 |
C15—C16 | 1.334 (3) | C6—C7 | 1.435 (2) |
C15—H15 | 0.9300 | C6—H6 | 0.9300 |
C16—C17 | 1.478 (3) | C7—C8 | 1.413 (3) |
C16—H16 | 0.9300 | C8—C15 | 1.479 (2) |
C17—O2 | 1.208 (2) | C8—C9 | 1.414 (2) |
C17—O1 | 1.344 (2) | C9—C14 | 1.440 (2) |
C18—O1 | 1.448 (2) | C9—C10 | 1.431 (3) |
C2—C1—Br1 | 118.41 (14) | C11—C10—H10 | 119.3 |
C14—C1—C2 | 123.12 (17) | C10—C11—H11 | 119.8 |
C14—C1—Br1 | 118.46 (14) | C10—C11—C12 | 120.37 (18) |
C1—C2—C3 | 123.06 (17) | C12—C11—H11 | 119.8 |
C1—C2—C7 | 118.09 (17) | C11—C12—H12 | 119.8 |
C3—C2—C7 | 118.85 (17) | C13—C12—C11 | 120.48 (17) |
C2—C3—H3 | 119.4 | C13—C12—H12 | 119.8 |
C4—C3—C2 | 121.20 (18) | C12—C13—H13 | 119.5 |
C4—C3—H3 | 119.4 | C12—C13—C14 | 121.07 (17) |
C3—C4—H4 | 119.8 | C14—C13—H13 | 119.5 |
C3—C4—C5 | 120.32 (18) | C1—C14—C9 | 118.22 (16) |
C5—C4—H4 | 119.8 | C1—C14—C13 | 123.08 (17) |
C4—C5—H5 | 119.9 | C13—C14—C9 | 118.68 (17) |
C6—C5—C4 | 120.29 (17) | C8—C15—H15 | 117.8 |
C6—C5—H5 | 119.9 | C16—C15—C8 | 124.45 (17) |
C5—C6—H6 | 119.1 | C16—C15—H15 | 117.8 |
C5—C6—C7 | 121.77 (17) | C15—C16—H16 | 119.6 |
C7—C6—H6 | 119.1 | C15—C16—C17 | 120.83 (18) |
C6—C7—C2 | 117.34 (16) | C17—C16—H16 | 119.6 |
C8—C7—C2 | 120.27 (16) | O1—C17—C16 | 110.43 (17) |
C8—C7—C6 | 122.32 (17) | O2—C17—C16 | 126.35 (18) |
C7—C8—C9 | 120.06 (16) | O2—C17—O1 | 123.22 (18) |
C7—C8—C15 | 121.10 (16) | H18A—C18—H18B | 109.5 |
C9—C8—C15 | 118.84 (16) | H18A—C18—H18C | 109.5 |
C8—C9—C10 | 121.88 (17) | H18B—C18—H18C | 109.5 |
C8—C9—C14 | 120.18 (16) | O1—C18—H18A | 109.5 |
C10—C9—C14 | 117.93 (16) | O1—C18—H18B | 109.5 |
C9—C10—H10 | 119.3 | O1—C18—H18C | 109.5 |
C11—C10—C9 | 121.42 (18) | C17—O1—C18 | 115.31 (16) |
C1—C2—C3—C4 | 177.29 (18) | C8—C15—C16—C17 | 177.77 (17) |
C1—C2—C7—C6 | −174.75 (17) | C9—C8—C15—C16 | 128.8 (2) |
C1—C2—C7—C8 | 2.3 (3) | C9—C10—C11—C12 | 1.3 (3) |
C2—C1—C14—C9 | 2.3 (3) | C10—C9—C14—C1 | 179.34 (16) |
C2—C1—C14—C13 | −176.07 (17) | C10—C9—C14—C13 | −2.2 (3) |
C2—C3—C4—C5 | −1.8 (3) | C10—C11—C12—C13 | −2.5 (3) |
C2—C7—C8—C9 | −2.1 (3) | C11—C12—C13—C14 | 1.3 (3) |
C2—C7—C8—C15 | 177.76 (16) | C12—C13—C14—C1 | 179.44 (18) |
C3—C2—C7—C6 | 5.1 (2) | C12—C13—C14—C9 | 1.1 (3) |
C3—C2—C7—C8 | −177.85 (16) | C14—C1—C2—C3 | 177.70 (17) |
C3—C4—C5—C6 | 3.6 (3) | C14—C1—C2—C7 | −2.4 (3) |
C4—C5—C6—C7 | −0.9 (3) | C14—C9—C10—C11 | 1.1 (3) |
C5—C6—C7—C2 | −3.5 (3) | C15—C8—C9—C10 | 0.7 (3) |
C5—C6—C7—C8 | 179.56 (18) | C15—C8—C9—C14 | −177.88 (16) |
C6—C7—C8—C9 | 174.75 (17) | C15—C16—C17—O1 | −173.18 (18) |
C6—C7—C8—C15 | −5.4 (3) | C15—C16—C17—O2 | 6.3 (3) |
C7—C2—C3—C4 | −2.6 (3) | C16—C17—O1—C18 | 179.04 (17) |
C7—C8—C9—C10 | −179.43 (17) | O2—C17—O1—C18 | −0.5 (3) |
C7—C8—C9—C14 | 2.0 (3) | Br1—C1—C2—C3 | −3.1 (2) |
C7—C8—C15—C16 | −51.1 (3) | Br1—C1—C2—C7 | 176.78 (13) |
C8—C9—C10—C11 | −177.55 (18) | Br1—C1—C14—C9 | −176.89 (13) |
C8—C9—C14—C1 | −2.0 (3) | Br1—C1—C14—C13 | 4.7 (2) |
C8—C9—C14—C13 | 176.41 (17) |
Cg1 is the centroid of the C2–C7 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C15—H15···Cg1i | 0.93 | 2.91 (2) | 3.5055 (19) | 123 |
C16—H16···O2ii | 0.93 | 2.40 | 3.315 (3) | 170 |
C5—H5···O2iii | 0.93 | 2.53 | 3.372 (2) | 150 |
Symmetry codes: (i) x, y−1, z; (ii) x, y+1, z; (iii) x, −y+1, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C18H13BrO2 |
Mr | 341.19 |
Crystal system, space group | Orthorhombic, Pbcn |
Temperature (K) | 100 |
a, b, c (Å) | 40.5848 (4), 5.32093 (5), 13.0710 (1) |
V (Å3) | 2822.67 (5) |
Z | 8 |
Radiation type | Cu Kα |
µ (mm−1) | 3.98 |
Crystal size (mm) | 0.21 × 0.19 × 0.13 |
Data collection | |
Diffractometer | Oxford Diffraction SuperNova, Dual, Cu at zero, Atlas |
Absorption correction | Analytical (CrysAlis PRO; Agilent, 2013) |
Tmin, Tmax | 0.891, 0.924 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 25313, 2961, 2900 |
Rint | 0.022 |
(sin θ/λ)max (Å−1) | 0.630 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.026, 0.066, 1.12 |
No. of reflections | 2961 |
No. of parameters | 191 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.31, −0.44 |
Computer programs: CrysAlis PRO (Agilent, 2013), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008) within OLEX2 (Dolomanov et al., 2009), PLATON (Spek, 2009) and Mercury (Macrae et al., 2008), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
Cg1 is the centroid of the C2–C7 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
C15—H15···Cg1i | 0.93 | 2.91 (2) | 3.5055 (19) | 123 |
C16—H16···O2ii | 0.93 | 2.40 | 3.315 (3) | 170 |
C5—H5···O2iii | 0.93 | 2.53 | 3.372 (2) | 150 |
Symmetry codes: (i) x, y−1, z; (ii) x, y+1, z; (iii) x, −y+1, z+1/2. |
Acknowledgements
The authors thank UAEU interdisciplinary grant 31S036 for financial support.
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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.
In our interest in [2 + 2]-photocycloaddition of anthracene derivatives in the crystal (Sonoda, 2011; Schmidt, 1964), the authors grew single crystals of the title compound. The bromo atom (C2—Br1—C14 plane) deviates from the averaged plane of the anthracenyl unit (C1—C14) at an angle of 3.66 (2)°. This unusual deviation (Barkhuizen et al., 2004) may be due to the forced closeness of Br1 to the π system (C9—C14) of the underlying anthracenyl unit. Eight strands of molecules of the title compound cross the unit cell and propagate along [010] (Figure 3). The neighboring strands that are related by c-glide operation are connected via C5—H5···O2 interaction (Table 1) and form a layer parallel to (100). The close contacts C16—H16···O2 and C15—H15···Cg1 (π) (Table 1) link the neighboring molecules within each strand (Figure 2). The average plane of an anthracenyl unit of a molecule in one strand forms an angle of 78.37 (2)° with an anthracenyl unit of a molecule in the neighboring strand.While the anthracenyl units of the molecules in one strand are parallel to each other and exhibit an off-set that would be beneficial for π-π interaction, they are too far apart (distance between the averaged planes of the respective anthracenyl units: 3.362 (2) Å) to exhibit a strong π-π interaction, in contrast with the non-brominated parent compound (Bugenhagen et al., 2013).
The closest distance between double bonds of two molecules, which are molecules in one strand, is 5.321 (3) Å. Although this distance is smaller than the smallest distance found in the non-brominated parent compound (5.549 (3) Å) (Bugenhagen et al., 2013), it is larger than in many of those found for aryl-enes that undergo [2 + 2]-photodimerization readily (Vishnumurthy et al. 2002; Mascitti et al. 2006). The anthracenyl units themselves, while aligned parallel to each other in one strand, are off-set to each other and are much further apart (5.321 (3) Å for C1—C1 and C8—C8) than in anthracenes (less than 4.2 Å) that have been reported to undergo [4 + 4]-photodimerization in the crystal (Schmidt, 1971; Ihmels et al., 2000).