organic compounds
4-Chloro-2-(6-nitro-1H-benzimidazol-2-yl)phenol N,N-dimethylformamide solvate
aSchool of Chemical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and bX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
*Correspondence e-mail: hkfun@usm.my
In the title compound, C13H8ClN3O3·C3H7NO, the benzimidazole and benzene rings make a dihedral angle of 0.63 (11)°. An intramolecular O—H⋯N hydrogen bond generates an S(6) ring motif. The solvent molecule is hydrogen-bonded to the benzimidazole molecule by intermolecular N—H⋯O and C—H⋯O hydrogen bonds, generating an R12(7) ring motif. In the crystal, the molecules are arranged into parallel layers perpendicular to the c axis and stabilized by weak π–π interactions [centroid–centroid distances in the range 3.4036 (18)–3.5878 (16) Å].
Related literature
For general background to and the biological activity of benzimidazole derivatives, see: Trivedi et al. (2006); White et al. (2004); Garuti et al. (2004). For related structures, see: Eltayeb et al. (2009); Yeap et al. (2009). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986). For hydrogen-bond motifs, see: Bernstein et al. (1995).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536810041243/ng5046sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810041243/ng5046Isup2.hkl
5-Chloro-2-hydroxy benzaldehyde (0.626 g, 4 mmol) was added to the solution of 4-nitrobenzene-1,2-diamine (0.306 g, 2 mmol) in methanol (30 ml). The mixture was refluxed with stirring for 1 h. The resultant solid obtained was then filtered and washed with methanol. Orange plate-shaped single crystals of the title compound suitable for X-ray
was obtained from DMF by slow evaporation at room temperature.The O– and N-bound hydrogen atoms were located from difference Fourier map and refined using a riding model [Uiso(H) = 1.2Ueq (N) or 1.5Ueq(O)]. The rest of hydrogen atoms were positioned geometrically [C–H = 0.93 & 0.96 Å] and refined using a riding model [Uiso(H) = 1.2 & 1.5Ueq(C)]. A rotating-group model were applied for methyl groups.
Benzimidazole and its derivatives are widely used in biological systems (Trivedi et al., 2006). Some derivatives of benzimidazole are used as inhibitors of the DNA-repair enzyme poly (ADP-ribose) polymerase-1 (PARP-1) (White et al., 2004) and antiproliferative activities (Garuti et al., 2004). In view of the biological importance of aforementioned benzimidazole, the
determination of the title compound was carried out and the result is presented here.The π···π interactions [Cg1···Cg1i of 3.4036 (18) Å, Cg1···Cg1ii of 3.5247 (17) Å and Cg1···Cg2i of 3.5878 (16) Å; (i) -x, y, 1/2 - z; (ii) -x, 1 - y, 1 - z. Cg1 and Cg2 are centroids of N1–C1–C6–N2–C7 and C1–C6 rings, respectively].
of title compound consists of one benzimidazole molecule and one dimethylformamide solvent (Fig. 1). The geometric parameters are comparable to those related structures (Eltayeb et al., 2009; Yeap et al., 2009). The molecular structure of the benzimidazole is essentially planar with the maximum deviation of 0.071 Å for atom O1. An intramolecular O3—H1O3···N2 hydrogen bond generate S(6) ring motif (Bernstein et al., 1995). The solvent molecule is hydrogen-bonded to the benzimidazole molecule by intermolecular N1—H1N1···O4 and C13—H13A···O4 hydrogen bonds generating R12(7) ring motif. In the crystal packing, the molecules are arranged into parallel layers perpendicular to c axis and stabilized by weakFor general background to and the biological activity of benzimidazole derivatives, see: Trivedi et al. (2006); White et al. (2004); Garuti et al. (2004). For related structures, see: Eltayeb et al. (2009); Yeap et al. (2009). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986). For hydrogen-bond motifs, see: Bernstein et al. (1995).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).C13H8ClN3O3·C3H7NO | F(000) = 1504 |
Mr = 362.77 | Dx = 1.491 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 3050 reflections |
a = 15.200 (2) Å | θ = 2.8–29.6° |
b = 18.355 (2) Å | µ = 0.27 mm−1 |
c = 13.279 (3) Å | T = 100 K |
β = 119.232 (2)° | Plate, orange |
V = 3233.1 (9) Å3 | 0.45 × 0.12 × 0.05 mm |
Z = 8 |
Bruker APEXII DUO CCD area-detector diffractometer | 3719 independent reflections |
Radiation source: fine-focus sealed tube | 2771 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.041 |
φ and ω scans | θmax = 27.5°, θmin = 1.9° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −19→19 |
Tmin = 0.889, Tmax = 0.987 | k = −23→23 |
14542 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)] = 0.065 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.201 | H-atom parameters constrained |
S = 1.07 | w = 1/[σ2(Fo2) + (0.0961P)2 + 7.3038P] where P = (Fo2 + 2Fc2)/3 |
3719 reflections | (Δ/σ)max < 0.001 |
228 parameters | Δρmax = 0.78 e Å−3 |
0 restraints | Δρmin = −0.34 e Å−3 |
C13H8ClN3O3·C3H7NO | V = 3233.1 (9) Å3 |
Mr = 362.77 | Z = 8 |
Monoclinic, C2/c | Mo Kα radiation |
a = 15.200 (2) Å | µ = 0.27 mm−1 |
b = 18.355 (2) Å | T = 100 K |
c = 13.279 (3) Å | 0.45 × 0.12 × 0.05 mm |
β = 119.232 (2)° |
Bruker APEXII DUO CCD area-detector diffractometer | 3719 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 2771 reflections with I > 2σ(I) |
Tmin = 0.889, Tmax = 0.987 | Rint = 0.041 |
14542 measured reflections |
R[F2 > 2σ(F2)] = 0.065 | 0 restraints |
wR(F2) = 0.201 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.78 e Å−3 |
3719 reflections | Δρmin = −0.34 e Å−3 |
228 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K. |
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 | −0.29053 (6) | 0.25697 (4) | 0.23736 (8) | 0.0465 (3) | |
O1 | 0.37235 (16) | 0.53844 (13) | 0.5412 (2) | 0.0418 (6) | |
O2 | 0.36636 (17) | 0.65517 (14) | 0.5483 (2) | 0.0444 (6) | |
O3 | −0.28130 (16) | 0.57579 (11) | 0.23880 (19) | 0.0362 (5) | |
H1O3 | −0.2293 | 0.5904 | 0.2591 | 0.054* | |
N1 | −0.00189 (16) | 0.46895 (13) | 0.37354 (18) | 0.0242 (5) | |
H1N1 | 0.0057 | 0.4209 | 0.3772 | 0.029* | |
N2 | −0.08820 (17) | 0.57321 (12) | 0.33366 (19) | 0.0245 (5) | |
N3 | 0.32588 (18) | 0.59601 (15) | 0.5240 (2) | 0.0327 (6) | |
C1 | 0.06745 (19) | 0.52535 (15) | 0.4062 (2) | 0.0227 (5) | |
C2 | 0.1718 (2) | 0.52401 (16) | 0.4543 (2) | 0.0261 (6) | |
H2A | 0.2085 | 0.4809 | 0.4719 | 0.031* | |
C3 | 0.21629 (19) | 0.59173 (15) | 0.4736 (2) | 0.0250 (6) | |
C4 | 0.1634 (2) | 0.65760 (16) | 0.4484 (2) | 0.0304 (6) | |
H4A | 0.1978 | 0.7016 | 0.4629 | 0.036* | |
C5 | 0.0598 (2) | 0.65720 (16) | 0.4018 (2) | 0.0287 (6) | |
H5A | 0.0233 | 0.7004 | 0.3852 | 0.034* | |
C6 | 0.0120 (2) | 0.59004 (15) | 0.3807 (2) | 0.0250 (6) | |
C7 | −0.09359 (19) | 0.50080 (15) | 0.3299 (2) | 0.0228 (5) | |
C8 | −0.18949 (19) | 0.46199 (14) | 0.2832 (2) | 0.0218 (5) | |
C9 | −0.2793 (2) | 0.50277 (16) | 0.2409 (2) | 0.0269 (6) | |
C10 | −0.3707 (2) | 0.46580 (18) | 0.2000 (3) | 0.0342 (7) | |
H10A | −0.4303 | 0.4923 | 0.1719 | 0.041* | |
C11 | −0.3743 (2) | 0.39127 (18) | 0.2004 (2) | 0.0339 (7) | |
H11A | −0.4355 | 0.3674 | 0.1750 | 0.041* | |
C12 | −0.2861 (2) | 0.35177 (17) | 0.2390 (2) | 0.0301 (6) | |
C13 | −0.1943 (2) | 0.38598 (15) | 0.2804 (2) | 0.0254 (6) | |
H13A | −0.1357 | 0.3586 | 0.3064 | 0.030* | |
O4 | 0.0524 (2) | 0.32533 (15) | 0.3936 (3) | 0.0728 (9) | |
N4 | 0.0760 (2) | 0.20375 (15) | 0.4053 (2) | 0.0374 (6) | |
C14 | 0.0997 (3) | 0.2715 (2) | 0.3954 (4) | 0.0526 (9) | |
H14A | 0.1575 | 0.2787 | 0.3892 | 0.063* | |
C15 | −0.0141 (3) | 0.1904 (3) | 0.4121 (4) | 0.0611 (11) | |
H15A | −0.0317 | 0.2334 | 0.4394 | 0.092* | |
H15B | −0.0026 | 0.1509 | 0.4645 | 0.092* | |
H15C | −0.0681 | 0.1779 | 0.3370 | 0.092* | |
C16 | 0.1378 (4) | 0.1427 (2) | 0.4137 (4) | 0.0710 (13) | |
H16A | 0.1942 | 0.1590 | 0.4061 | 0.106* | |
H16B | 0.0989 | 0.1085 | 0.3534 | 0.106* | |
H16C | 0.1616 | 0.1195 | 0.4873 | 0.106* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0443 (5) | 0.0298 (4) | 0.0618 (5) | −0.0138 (3) | 0.0230 (4) | −0.0003 (3) |
O1 | 0.0249 (11) | 0.0443 (14) | 0.0522 (13) | −0.0012 (10) | 0.0157 (10) | −0.0013 (10) |
O2 | 0.0298 (12) | 0.0452 (14) | 0.0561 (14) | −0.0158 (10) | 0.0192 (10) | −0.0078 (11) |
O3 | 0.0252 (10) | 0.0291 (11) | 0.0515 (13) | 0.0043 (8) | 0.0164 (10) | −0.0016 (9) |
N1 | 0.0197 (11) | 0.0250 (12) | 0.0278 (11) | 0.0006 (9) | 0.0116 (9) | 0.0019 (9) |
N2 | 0.0230 (11) | 0.0238 (12) | 0.0279 (11) | −0.0039 (9) | 0.0135 (9) | −0.0012 (9) |
N3 | 0.0229 (12) | 0.0402 (15) | 0.0341 (12) | −0.0047 (11) | 0.0133 (10) | −0.0033 (10) |
C1 | 0.0209 (12) | 0.0270 (14) | 0.0217 (11) | −0.0059 (10) | 0.0115 (10) | −0.0023 (10) |
C2 | 0.0226 (13) | 0.0301 (15) | 0.0271 (12) | 0.0008 (11) | 0.0134 (10) | −0.0006 (10) |
C3 | 0.0172 (12) | 0.0326 (15) | 0.0248 (12) | −0.0051 (10) | 0.0101 (10) | −0.0024 (10) |
C4 | 0.0292 (15) | 0.0276 (15) | 0.0334 (14) | −0.0087 (11) | 0.0145 (11) | −0.0046 (11) |
C5 | 0.0273 (14) | 0.0251 (14) | 0.0325 (14) | 0.0016 (11) | 0.0138 (11) | −0.0001 (11) |
C6 | 0.0235 (13) | 0.0276 (14) | 0.0235 (12) | −0.0018 (11) | 0.0112 (10) | −0.0020 (10) |
C7 | 0.0196 (12) | 0.0290 (14) | 0.0217 (11) | −0.0008 (10) | 0.0114 (10) | 0.0009 (10) |
C8 | 0.0187 (12) | 0.0248 (14) | 0.0219 (11) | −0.0025 (10) | 0.0100 (10) | −0.0007 (9) |
C9 | 0.0226 (13) | 0.0294 (15) | 0.0281 (13) | 0.0011 (11) | 0.0119 (11) | 0.0008 (10) |
C10 | 0.0186 (13) | 0.0455 (19) | 0.0371 (15) | 0.0020 (12) | 0.0124 (12) | −0.0009 (13) |
C11 | 0.0227 (14) | 0.0443 (18) | 0.0328 (14) | −0.0118 (12) | 0.0121 (11) | −0.0024 (12) |
C12 | 0.0288 (14) | 0.0309 (15) | 0.0299 (13) | −0.0094 (12) | 0.0138 (11) | −0.0005 (11) |
C13 | 0.0213 (13) | 0.0276 (14) | 0.0264 (12) | −0.0011 (10) | 0.0110 (10) | 0.0019 (10) |
O4 | 0.073 (2) | 0.0341 (15) | 0.099 (2) | 0.0211 (14) | 0.0322 (18) | 0.0026 (14) |
N4 | 0.0405 (15) | 0.0347 (15) | 0.0394 (14) | −0.0003 (11) | 0.0214 (12) | −0.0028 (11) |
C14 | 0.048 (2) | 0.041 (2) | 0.066 (2) | −0.0015 (17) | 0.0258 (18) | 0.0046 (17) |
C15 | 0.048 (2) | 0.070 (3) | 0.064 (2) | −0.001 (2) | 0.027 (2) | 0.009 (2) |
C16 | 0.092 (4) | 0.051 (3) | 0.078 (3) | 0.023 (2) | 0.049 (3) | 0.000 (2) |
Cl1—C12 | 1.741 (3) | C8—C13 | 1.397 (4) |
O1—N3 | 1.229 (3) | C8—C9 | 1.411 (4) |
O2—N3 | 1.212 (3) | C9—C10 | 1.396 (4) |
O3—C9 | 1.341 (3) | C10—C11 | 1.369 (5) |
O3—H1O3 | 0.7498 | C10—H10A | 0.9300 |
N1—C7 | 1.354 (3) | C11—C12 | 1.384 (4) |
N1—C1 | 1.387 (3) | C11—H11A | 0.9300 |
N1—H1N1 | 0.8875 | C12—C13 | 1.376 (4) |
N2—C7 | 1.331 (4) | C13—H13A | 0.9300 |
N2—C6 | 1.370 (3) | O4—C14 | 1.216 (5) |
N3—C3 | 1.463 (3) | N4—C14 | 1.319 (5) |
C1—C2 | 1.391 (4) | N4—C16 | 1.431 (5) |
C1—C6 | 1.399 (4) | N4—C15 | 1.437 (5) |
C2—C3 | 1.378 (4) | C14—H14A | 0.9300 |
C2—H2A | 0.9300 | C15—H15A | 0.9600 |
C3—C4 | 1.399 (4) | C15—H15B | 0.9600 |
C4—C5 | 1.383 (4) | C15—H15C | 0.9600 |
C4—H4A | 0.9300 | C16—H16A | 0.9600 |
C5—C6 | 1.388 (4) | C16—H16B | 0.9600 |
C5—H5A | 0.9300 | C16—H16C | 0.9600 |
C7—C8 | 1.461 (4) | ||
C9—O3—H1O3 | 110.0 | O3—C9—C8 | 123.1 (2) |
C7—N1—C1 | 106.1 (2) | C10—C9—C8 | 118.9 (3) |
C7—N1—H1N1 | 122.1 | C11—C10—C9 | 121.2 (3) |
C1—N1—H1N1 | 131.8 | C11—C10—H10A | 119.4 |
C7—N2—C6 | 106.1 (2) | C9—C10—H10A | 119.4 |
O2—N3—O1 | 123.4 (3) | C10—C11—C12 | 119.5 (3) |
O2—N3—C3 | 119.1 (3) | C10—C11—H11A | 120.3 |
O1—N3—C3 | 117.5 (2) | C12—C11—H11A | 120.3 |
N1—C1—C2 | 130.7 (3) | C13—C12—C11 | 121.3 (3) |
N1—C1—C6 | 106.4 (2) | C13—C12—Cl1 | 119.1 (2) |
C2—C1—C6 | 122.9 (3) | C11—C12—Cl1 | 119.6 (2) |
C3—C2—C1 | 114.6 (3) | C12—C13—C8 | 119.7 (3) |
C3—C2—H2A | 122.7 | C12—C13—H13A | 120.1 |
C1—C2—H2A | 122.7 | C8—C13—H13A | 120.1 |
C2—C3—C4 | 124.2 (3) | C14—N4—C16 | 123.0 (4) |
C2—C3—N3 | 118.6 (3) | C14—N4—C15 | 118.9 (3) |
C4—C3—N3 | 117.1 (2) | C16—N4—C15 | 118.0 (4) |
C5—C4—C3 | 119.9 (3) | O4—C14—N4 | 125.4 (4) |
C5—C4—H4A | 120.0 | O4—C14—H14A | 117.3 |
C3—C4—H4A | 120.0 | N4—C14—H14A | 117.3 |
C4—C5—C6 | 117.6 (3) | N4—C15—H15A | 109.5 |
C4—C5—H5A | 121.2 | N4—C15—H15B | 109.5 |
C6—C5—H5A | 121.2 | H15A—C15—H15B | 109.5 |
N2—C6—C5 | 130.4 (3) | N4—C15—H15C | 109.5 |
N2—C6—C1 | 108.9 (2) | H15A—C15—H15C | 109.5 |
C5—C6—C1 | 120.8 (2) | H15B—C15—H15C | 109.5 |
N2—C7—N1 | 112.6 (2) | N4—C16—H16A | 109.5 |
N2—C7—C8 | 122.2 (2) | N4—C16—H16B | 109.5 |
N1—C7—C8 | 125.2 (2) | H16A—C16—H16B | 109.5 |
C13—C8—C9 | 119.4 (2) | N4—C16—H16C | 109.5 |
C13—C8—C7 | 121.8 (2) | H16A—C16—H16C | 109.5 |
C9—C8—C7 | 118.8 (2) | H16B—C16—H16C | 109.5 |
O3—C9—C10 | 118.0 (3) | ||
C7—N1—C1—C2 | −179.0 (3) | C6—N2—C7—C8 | −179.2 (2) |
C7—N1—C1—C6 | 0.6 (3) | C1—N1—C7—N2 | −0.9 (3) |
N1—C1—C2—C3 | 178.8 (2) | C1—N1—C7—C8 | 179.1 (2) |
C6—C1—C2—C3 | −0.8 (4) | N2—C7—C8—C13 | −179.5 (2) |
C1—C2—C3—C4 | 0.2 (4) | N1—C7—C8—C13 | 0.4 (4) |
C1—C2—C3—N3 | −180.0 (2) | N2—C7—C8—C9 | −0.2 (4) |
O2—N3—C3—C2 | −175.2 (3) | N1—C7—C8—C9 | 179.8 (2) |
O1—N3—C3—C2 | 3.6 (4) | C13—C8—C9—O3 | −178.9 (2) |
O2—N3—C3—C4 | 4.6 (4) | C7—C8—C9—O3 | 1.7 (4) |
O1—N3—C3—C4 | −176.6 (2) | C13—C8—C9—C10 | 1.7 (4) |
C2—C3—C4—C5 | 0.5 (4) | C7—C8—C9—C10 | −177.7 (2) |
N3—C3—C4—C5 | −179.3 (2) | O3—C9—C10—C11 | −179.4 (3) |
C3—C4—C5—C6 | −0.7 (4) | C8—C9—C10—C11 | 0.0 (4) |
C7—N2—C6—C5 | 178.3 (3) | C9—C10—C11—C12 | −1.9 (4) |
C7—N2—C6—C1 | −0.4 (3) | C10—C11—C12—C13 | 2.1 (4) |
C4—C5—C6—N2 | −178.5 (3) | C10—C11—C12—Cl1 | −178.9 (2) |
C4—C5—C6—C1 | 0.1 (4) | C11—C12—C13—C8 | −0.4 (4) |
N1—C1—C6—N2 | −0.1 (3) | Cl1—C12—C13—C8 | −179.4 (2) |
C2—C1—C6—N2 | 179.5 (2) | C9—C8—C13—C12 | −1.5 (4) |
N1—C1—C6—C5 | −179.0 (2) | C7—C8—C13—C12 | 177.9 (2) |
C2—C1—C6—C5 | 0.6 (4) | C16—N4—C14—O4 | −176.2 (4) |
C6—N2—C7—N1 | 0.8 (3) | C15—N4—C14—O4 | 1.6 (6) |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H1O3···N2 | 0.75 | 1.90 | 2.568 (4) | 149 |
N1—H1N1···O4 | 0.89 | 1.86 | 2.736 (4) | 167 |
C13—H13A···O4 | 0.93 | 2.58 | 3.472 (5) | 161 |
Experimental details
Crystal data | |
Chemical formula | C13H8ClN3O3·C3H7NO |
Mr | 362.77 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 100 |
a, b, c (Å) | 15.200 (2), 18.355 (2), 13.279 (3) |
β (°) | 119.232 (2) |
V (Å3) | 3233.1 (9) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.27 |
Crystal size (mm) | 0.45 × 0.12 × 0.05 |
Data collection | |
Diffractometer | Bruker APEXII DUO CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.889, 0.987 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14542, 3719, 2771 |
Rint | 0.041 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.065, 0.201, 1.07 |
No. of reflections | 3719 |
No. of parameters | 228 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.78, −0.34 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H1O3···N2 | 0.75 | 1.90 | 2.568 (4) | 149 |
N1—H1N1···O4 | 0.89 | 1.86 | 2.736 (4) | 167 |
C13—H13A···O4 | 0.93 | 2.58 | 3.472 (5) | 161 |
Acknowledgements
The authors thank the Malaysian Government and Universiti Sains Malaysia (USM) for the RU research grant (815002). HKF and CSY also thank USM for the Research University Grant No. 1001/PFIZIK/811160. AMF thanks the Libyan Government for providing a scholarship.
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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.
Benzimidazole and its derivatives are widely used in biological systems (Trivedi et al., 2006). Some derivatives of benzimidazole are used as inhibitors of the DNA-repair enzyme poly (ADP-ribose) polymerase-1 (PARP-1) (White et al., 2004) and antiproliferative activities (Garuti et al., 2004). In view of the biological importance of aforementioned benzimidazole, the crystal structure determination of the title compound was carried out and the result is presented here.
The asymmetric unit of title compound consists of one benzimidazole molecule and one dimethylformamide solvent (Fig. 1). The geometric parameters are comparable to those related structures (Eltayeb et al., 2009; Yeap et al., 2009). The molecular structure of the benzimidazole is essentially planar with the maximum deviation of 0.071 Å for atom O1. An intramolecular O3—H1O3···N2 hydrogen bond generate S(6) ring motif (Bernstein et al., 1995). The solvent molecule is hydrogen-bonded to the benzimidazole molecule by intermolecular N1—H1N1···O4 and C13—H13A···O4 hydrogen bonds generating R12(7) ring motif. In the crystal packing, the molecules are arranged into parallel layers perpendicular to c axis and stabilized by weak π···π interactions [Cg1···Cg1i of 3.4036 (18) Å, Cg1···Cg1ii of 3.5247 (17) Å and Cg1···Cg2i of 3.5878 (16) Å; (i) -x, y, 1/2 - z; (ii) -x, 1 - y, 1 - z. Cg1 and Cg2 are centroids of N1–C1–C6–N2–C7 and C1–C6 rings, respectively].