organic papers
Acta Cryst.(2006). E62, o1959–o1960 doi:10.1107/S1600536806013729 Ronget al. C
20H12Br2N20.5C14H12Br2O2
o1959
Acta Crystallographica Section E
Structure Reports
Online
ISSN 1600-5368
A 2:1 cocrystal of 2,3-bis(4-bromophenyl)quinoxaline
and 1,2-bis(4-bromophenyl)ethane-1,2-diol
Liang-Ce Rong,* Xiao-Yue Li, Chang-Sheng Yao, Hai-Ying Wang and Da-Qing Shi
Department of Chemistry, Xuzhou Normal University, Xuzhou 221116, People’s Republic of China
Correspondence e-mail: lcrong2005@yahoo.com
Key indicators
Single-crystal X-ray study T= 193 K
Mean(C–C) = 0.005 A˚ Rfactor = 0.038 wRfactor = 0.097
Data-to-parameter ratio = 14.3
For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.
Received 10 April 2006 Accepted 16 April 2006
#2006 International Union of Crystallography All rights reserved
The title compound, C20H12Br2N20.5C14H12Br2O2, was
synthesized by the one-pot reaction of benzofurazan oxide and 1,2-bis(4-bromophenyl)ethane-1,2-dione induced by a low-valent titanium reagent. X-ray analysis reveals that the 1,2-bis(4-bromophenyl)ethane-1,2-diol molecule is located on an inversion centre. The molecules are linkedviaO—H N hydrogen bonds and C—H interactions.
Comment
Quinoxaline derivatives are an important class of nitrogen-containing heterocycles and they constitute useful inter-mediates in organic synthesis They have been reported for their applications in the fields of dyes (Brocket al., 1999) and pharmaceuticals (Gazitet al., 1996; Sehlstedtet al., 1998) and have also been used as building blocks for the synthesis of organic semiconductors (Daileyet al., 2001). Low-valent tita-nium reagents have an exceedingly high ability to promote reductive coupling of carbonyl compounds and are attracting increasing interest in organic synthesis (McMurry, 1983; Shiet al., 2003). We report here the crystal structure of the title compound, (I)
The asymmetric unit of (I) contains one 2,3-bis(4-bromo-phenyl)quinoxaline (bbq) molecule and one half-molecule of 1,2-bis(4-bromophenyl)ethane-1,2-diol (bbe) which is located on an inversion centre (Fig. 1). Bond lengths and angles in the molecules show normal values (Table 1). The C16–C21 and C22–C27 benzene rings form dihedral angles of 38.1 (1) and 51.8 (1), respectively, with the mean quinoxaline plane. The C2–C7 and C2A–C7Abenzene rings are parallel by symmetry. Two bbq molecules and one bbe molecule are connectedvia
Experimental
Compound (I) was prepared by the reaction of benzofurazan oxide (2 mmol) and 1,2-bis(4-bromophenyl)ethane-1,2-dione (2 mmol) with a low-valent titanium reagent (TiCl4/Zn; 1.1 ml/1.30 g) in THF
(15 ml). Single crystals of (I) suitable for X-ray diffraction were obtained by slow evaporation of an ethanol solution.
Crystal data
C20H12Br2N20.5C14H12Br2O2
Mr= 626.13
Triclinic,P1
a= 7.8746 (7) A˚
b= 11.9601 (9) A˚
c= 14.446 (2) A˚
= 66.121 (11) = 83.931 (17) = 71.126 (15)
V= 1176.7 (3) A˚3
Z= 2
Dx= 1.767 Mg m
3
MoKradiation
= 5.17 mm1
T= 193 (2) K Block, yellow 0.300.240.13 mm
Data collection
Rigaku Mercury diffractometer
!scans
Absorption correction: multi-scan (Jacobson, 1998)
Tmin= 0.306,Tmax= 0.553
(expected range = 0.283–0.511)
11766 measured reflections 4295 independent reflections 3425 reflections withI> 2(I)
Rint= 0.037
max= 25.3
Refinement
Refinement onF2 R[F2> 2(F2)] = 0.038
wR(F2) = 0.097
S= 1.03 4295 reflections 300 parameters
H-atom parameters constrained
w= 1/[2(F
o2) + (0.0531P)2]
whereP= (Fo2+ 2Fc2)/3
(/)max= 0.001
max= 1.04 e A˚ 3
min=0.65 e A˚ 3
Table 1
Selected geometric parameters (A˚ ,).
Br1—C5 1.904 (3) Br2—C19 1.900 (4) Br3—C25 1.899 (3) N1—C11 1.318 (4)
N1—C8 1.373 (4) N2—C10 1.319 (4) N2—C9 1.372 (4)
C11—N1—C8 118.6 (3) C10—N2—C9 118.6 (3) O1—C1—C2 112.4 (3) O1—C1—C1i
108.3 (4) C2—C1—C1i
111.1 (3)
N2—C10—C16 115.5 (3) C11—C10—C16 123.5 (3) N1—C11—C22 115.6 (3) C10—C11—C22 123.5 (3)
[image:2.610.314.567.69.234.2]Symmetry code: (i)xþ2;y;z.
Table 2
Hydrogen-bond geometry (A˚ ,).
Cgis the centroid of the C2–C7 benzene ring.
D—H A D—H H A D A D—H A
O1—H1 N1ii
0.84 2.05 2.882 (4) 168 C12—H12 Cgiii 0.95 2.84 3.666 (4) 146
Symmetry codes: (ii)xþ1;yþ1;z; (iii)x1;yþ1;z.
H atoms were positioned geometrically and treated as riding, with an O—H distance of 0.84 A˚ and C—H distances in the range 0.95– 1.00 A˚ , and with Uiso(H) = 1.5Ueq(C) for methyl H atoms and 1.2Ueq(C) for others. The highest peak is located 0.56 A˚ from atom H1A.
Data collection: CrystalClear (Rigaku, 2000); cell refinement:
CrystalClear; data reduction: CrystalStructure (Rigaku/MSC, 2003); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure:SHELXL97(Sheldrick, 1997); molecular graphics: SHELXTL (Bruker, 1999); software used to prepare material for publication:SHELXTL.
The authors thank the Natural Science Foundation of Xuzhou Normal university (grant No. 04XLB14) for financial support.
References
Brock, E. D., Lewis, D. M., Yousaf, T. I. & Harper, H. H. (1999). (The Procter & Gamble Company, USA) World Patent WO 9951688.
Bruker (1999).SHELXTL. Bruker AXS Inc., Madison, Wisconsin, USA. Dailey, S., Feast, J. W., Peace, R. J., Sage, I. C., Till, S. & Wood, E. L. (2001).J.
Mater. Chem.11, 2238–2243.
Gazit, A., App, H., McMahon, G., Chen, J., Levitzki, A. & Bohmer, F. D. (1996).J. Med. Chem.39, 2170–2177.
Jacobson, R. (1998). Private communication to the Rigaku Corporation, Tokyo, Japan.
McMurry, J. E. (1983).Acc. Chem. Res.16, 405–411.
Rigaku (2000).CrystalClear. Rigaku Corporation, 3-9-12 Akishima, Tokyo, Japan.
Rigaku/MSC (2003).CrystalStructure. Rigaku/MSC, 9009 New Trails Drive, The Woodlands, TX 77381-5209, USA.
Sehlstedt, U., Aich, P., Bergman, J., Vallberg, H., Norden, B. & Graslund, A. (1998).J. Mol. Biol.278, 31–56.
Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Go¨ttingen, Germany.
Shi, D. Q., Rong, L. C., Wang, J. X., Zhuang, Q. Y., Wang, X. S. & Hu, H. W. (2003).Tetrahedron Lett.44, 3199–3201.
Figure 1
[image:2.610.41.297.644.681.2]supporting information
sup-1 Acta Cryst. (2006). E62, o1959–o1960
supporting information
Acta Cryst. (2006). E62, o1959–o1960 [https://doi.org/10.1107/S1600536806013729]
A 2:1 cocrystal of 2,3-bis(4-bromophenyl)quinoxaline and
1,2-bis(4-bromo-phenyl)ethane-1,2-diol
Liang-Ce Rong, Xiao-Yue Li, Chang-Sheng Yao, Hai-Ying Wang and Da-Qing Shi
2,3-bis(4-bromophenyl)quinoxaline–1,2-bis(4-bromophenyl)ethane-1,2-diol (2/1)
Crystal data
C20H12Br2N2·0.5C14H12Br2O2
Mr = 626.13
Triclinic, P1 Hall symbol: -P 1 a = 7.8746 (7) Å b = 11.9601 (9) Å c = 14.446 (2) Å α = 66.121 (11)° β = 83.931 (17)° γ = 71.126 (15)° V = 1176.7 (3) Å3
Z = 2 F(000) = 614 Dx = 1.767 Mg m−3
Mo Kα radiation, λ = 0.71070 Å Cell parameters from 4575 reflections θ = 3.1–25.3°
µ = 5.17 mm−1
T = 193 K Block, yellow
0.30 × 0.24 × 0.13 mm
Data collection
Rigaku Mercury diffractometer
Radiation source: fine-focus sealed tube Graphite monochromator
Detector resolution: 7.31 pixels mm-1
ω scans
Absorption correction: multi-scan (Jacobson, 1998)
Tmin = 0.306, Tmax = 0.553
11766 measured reflections 4295 independent reflections 3425 reflections with I > 2σ(I) Rint = 0.037
θmax = 25.3°, θmin = 3.1°
h = −8→9 k = −14→14 l = −17→16
Refinement
Refinement on F2
Least-squares matrix: full R[F2 > 2σ(F2)] = 0.038
wR(F2) = 0.097
S = 1.03 4295 reflections 300 parameters 0 restraints
Primary atom site location: structure-invariant direct methods
Secondary atom site location: difference Fourier map
Hydrogen site location: inferred from neighbouring sites
H-atom parameters constrained w = 1/[σ2(F
o2) + (0.0531P)2]
where P = (Fo2 + 2Fc2)/3
(Δ/σ)max = 0.001
Δρmax = 1.04 e Å−3
Special details
Experimental. Spectroscopic analysis: IR (KBr, cm-1): 3090, 1664, 1586, 1568, 1482, 1398, 1312, 1209, 1173, 1112,
1070, 1008, 880, 833, 760, 748, 725, 681; 1H NMR (DMSO-d
6, δ, p.p.m.): 4.55 (2H, s, CH), 5.43 (2H, s, OH), 7.18 (4H,
d, J = 8.0 Hz, ArH), 7.45 (12H, t, J = 8.0 Hz, ArH), 7.62 (8H, d, J = 8.0 Hz, ArH), 7.91–7.93 (4H, dd, J = 3.6 Hz, J = 3.6 Hz, ArH), 8.17–8.19 (4H, dd, J = 3.6 Hz, J = 3.6 Hz, ArH).
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.
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2)
x y z Uiso*/Ueq
supporting information
sup-3 Acta Cryst. (2006). E62, o1959–o1960
C17 −0.0023 (5) 0.2748 (3) 0.5371 (3) 0.0286 (8) H17 −0.0701 0.3236 0.5742 0.034* C18 0.0816 (5) 0.1449 (4) 0.5874 (3) 0.0313 (8) H18 0.0721 0.1043 0.6586 0.038* C19 0.1792 (5) 0.0746 (3) 0.5335 (3) 0.0310 (8) C20 0.1925 (5) 0.1316 (4) 0.4302 (3) 0.0365 (9) H20 0.2587 0.0816 0.3937 0.044* C21 0.1090 (5) 0.2618 (4) 0.3798 (3) 0.0308 (8) H21 0.1188 0.3010 0.3085 0.037* C22 0.1752 (4) 0.5256 (3) 0.2629 (2) 0.0239 (7) C23 0.3219 (4) 0.4640 (3) 0.3316 (3) 0.0289 (8) H23 0.3017 0.4388 0.4022 0.035* C24 0.4950 (4) 0.4397 (3) 0.2982 (3) 0.0297 (8) H24 0.5942 0.3983 0.3450 0.036* C25 0.5221 (4) 0.4769 (3) 0.1946 (3) 0.0263 (8) C26 0.3806 (4) 0.5352 (3) 0.1257 (3) 0.0289 (8) H26 0.4016 0.5578 0.0554 0.035* C27 0.2074 (4) 0.5606 (3) 0.1600 (3) 0.0272 (8) H27 0.1090 0.6025 0.1127 0.033*
Atomic displacement parameters (Å2)
U11 U22 U33 U12 U13 U23
C20 0.039 (2) 0.031 (2) 0.038 (2) −0.0034 (17) 0.0049 (17) −0.0191 (18) C21 0.037 (2) 0.028 (2) 0.0262 (18) −0.0105 (16) 0.0046 (15) −0.0100 (16) C22 0.0237 (17) 0.0200 (18) 0.0256 (18) −0.0066 (14) 0.0059 (14) −0.0080 (15) C23 0.0256 (18) 0.031 (2) 0.0281 (19) −0.0099 (15) 0.0028 (14) −0.0093 (16) C24 0.0239 (18) 0.028 (2) 0.035 (2) −0.0084 (15) −0.0032 (15) −0.0082 (16) C25 0.0237 (18) 0.0234 (19) 0.033 (2) −0.0082 (14) 0.0086 (15) −0.0137 (16) C26 0.0264 (19) 0.026 (2) 0.0253 (18) −0.0040 (15) 0.0041 (15) −0.0056 (15) C27 0.0237 (18) 0.027 (2) 0.0240 (18) −0.0040 (14) 0.0019 (14) −0.0067 (15)
Geometric parameters (Å, º)
Br1—C5 1.904 (3) C12—C13 1.355 (5) Br2—C19 1.900 (4) C12—H12 0.95 Br3—C25 1.899 (3) C13—C14 1.421 (5) O1—C1 1.395 (4) C13—H13 0.95 O1—H1 0.84 C14—C15 1.358 (5) N1—C11 1.318 (4) C14—H14 0.95 N1—C8 1.373 (4) C15—H15 0.95 N2—C10 1.319 (4) C16—C21 1.386 (5) N2—C9 1.372 (4) C16—C17 1.405 (5) C1—C2 1.517 (5) C17—C18 1.379 (5) C1—C1i 1.536 (7) C17—H17 0.95
C1—H1A 1.00 C18—C19 1.374 (5) C2—C3 1.381 (5) C18—H18 0.95 C2—C7 1.395 (5) C19—C20 1.376 (5) C3—C4 1.383 (5) C20—C21 1.381 (5) C3—H3 0.95 C20—H20 0.95 C4—C5 1.383 (5) C21—H21 0.95 C4—H4 0.95 C22—C27 1.391 (5) C5—C6 1.369 (5) C22—C23 1.401 (5) C6—C7 1.386 (5) C23—C24 1.376 (5) C6—H6 0.95 C23—H23 0.95 C7—H7 0.95 C24—C25 1.392 (5) C8—C12 1.406 (5) C24—H24 0.95 C8—C9 1.410 (5) C25—C26 1.374 (5) C9—C15 1.409 (5) C26—C27 1.382 (5) C10—C11 1.444 (4) C26—H26 0.95 C10—C16 1.487 (5) C27—H27 0.95 C11—C22 1.480 (5)
C1—O1—H1 109.5 C14—C13—H13 119.7 C11—N1—C8 118.6 (3) C15—C14—C13 120.8 (3) C10—N2—C9 118.6 (3) C15—C14—H14 119.6 O1—C1—C2 112.4 (3) C13—C14—H14 119.6 O1—C1—C1i 108.3 (4) C14—C15—C9 119.5 (3)
C2—C1—C1i 111.1 (3) C14—C15—H15 120.3
supporting information
sup-5 Acta Cryst. (2006). E62, o1959–o1960
C1i—C1—H1A 108.4 C21—C16—C10 122.8 (3)
C3—C2—C7 118.5 (3) C17—C16—C10 119.0 (3) C3—C2—C1 122.1 (3) C18—C17—C16 120.9 (3) C7—C2—C1 119.4 (3) C18—C17—H17 119.6 C2—C3—C4 121.2 (3) C16—C17—H17 119.6 C2—C3—H3 119.4 C19—C18—C17 119.4 (3) C4—C3—H3 119.4 C19—C18—H18 120.3 C3—C4—C5 119.0 (3) C17—C18—H18 120.3 C3—C4—H4 120.5 C18—C19—C20 121.0 (3) C5—C4—H4 120.5 C18—C19—Br2 119.5 (3) C6—C5—C4 121.2 (3) C20—C19—Br2 119.4 (3) C6—C5—Br1 118.9 (3) C19—C20—C21 119.7 (4) C4—C5—Br1 120.0 (3) C19—C20—H20 120.2 C5—C6—C7 119.3 (3) C21—C20—H20 120.2 C5—C6—H6 120.3 C20—C21—C16 120.8 (3) C7—C6—H6 120.3 C20—C21—H21 119.6 C6—C7—C2 120.7 (3) C16—C21—H21 119.6 C6—C7—H7 119.6 C27—C22—C23 118.8 (3) C2—C7—H7 119.6 C27—C22—C11 120.3 (3) N1—C8—C12 120.0 (3) C23—C22—C11 120.7 (3) N1—C8—C9 120.4 (3) C24—C23—C22 120.8 (3) C12—C8—C9 119.5 (3) C24—C23—H23 119.6 N2—C9—C15 119.8 (3) C22—C23—H23 119.6 N2—C9—C8 120.4 (3) C23—C24—C25 118.8 (3) C15—C9—C8 119.8 (3) C23—C24—H24 120.6 N2—C10—C11 121.0 (3) C25—C24—H24 120.6 N2—C10—C16 115.5 (3) C26—C25—C24 121.6 (3) C11—C10—C16 123.5 (3) C26—C25—Br3 119.5 (3) N1—C11—C10 120.9 (3) C24—C25—Br3 118.9 (2) N1—C11—C22 115.6 (3) C25—C26—C27 119.1 (3) C10—C11—C22 123.5 (3) C25—C26—H26 120.4 C13—C12—C8 119.9 (3) C27—C26—H26 120.4 C13—C12—H12 120.0 C26—C27—C22 120.9 (3) C8—C12—H12 120.0 C26—C27—H27 119.6 C12—C13—C14 120.5 (3) C22—C27—H27 119.6 C12—C13—H13 119.7
O1—C1—C2—C3 −150.7 (3) C12—C13—C14—C15 1.5 (6) C1i—C1—C2—C3 87.9 (5) C13—C14—C15—C9 −0.4 (6)
O1—C1—C2—C7 30.7 (5) N2—C9—C15—C14 179.0 (3) C1i—C1—C2—C7 −90.8 (5) C8—C9—C15—C14 −0.9 (5)
C5—C6—C7—C2 −0.4 (6) C17—C18—C19—C20 −0.8 (5) C3—C2—C7—C6 −0.6 (5) C17—C18—C19—Br2 −179.8 (2) C1—C2—C7—C6 178.1 (3) C18—C19—C20—C21 1.0 (6) C11—N1—C8—C12 176.8 (3) Br2—C19—C20—C21 −179.9 (3) C11—N1—C8—C9 −0.2 (5) C19—C20—C21—C16 −0.3 (5) C10—N2—C9—C15 −179.0 (3) C17—C16—C21—C20 −0.7 (5) C10—N2—C9—C8 0.8 (5) C10—C16—C21—C20 −178.8 (3) N1—C8—C9—N2 −1.7 (5) N1—C11—C22—C27 −48.6 (5) C12—C8—C9—N2 −178.8 (3) C10—C11—C22—C27 134.3 (4) N1—C8—C9—C15 178.2 (3) N1—C11—C22—C23 126.1 (4) C12—C8—C9—C15 1.1 (5) C10—C11—C22—C23 −51.0 (5) C9—N2—C10—C11 1.7 (5) C27—C22—C23—C24 0.7 (6) C9—N2—C10—C16 −178.0 (3) C11—C22—C23—C24 −174.1 (3) C8—N1—C11—C10 2.8 (5) C22—C23—C24—C25 −0.3 (6) C8—N1—C11—C22 −174.4 (3) C23—C24—C25—C26 −1.0 (6) N2—C10—C11—N1 −3.7 (5) C23—C24—C25—Br3 178.2 (3) C16—C10—C11—N1 176.1 (3) C24—C25—C26—C27 1.7 (6) N2—C10—C11—C22 173.3 (3) Br3—C25—C26—C27 −177.4 (3) C16—C10—C11—C22 −6.9 (5) C25—C26—C27—C22 −1.3 (6) N1—C8—C12—C13 −177.1 (3) C23—C22—C27—C26 0.1 (5) C9—C8—C12—C13 0.0 (5) C11—C22—C27—C26 174.9 (3) C8—C12—C13—C14 −1.3 (6)
Symmetry code: (i) −x+2, −y, −z.
Hydrogen-bond geometry (Å, º)
D—H···A D—H H···A D···A D—H···A
O1—H1···N1ii 0.84 2.05 2.882 (4) 168
C12—H12···Cgiii 0.95 2.84 3.666 (4) 146