organic compounds
(E)-1-[(2-Amino-5-nitrophenyl)iminiomethyl]naphthalen-2-olate
aSchool of Chemical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, bCrystal Materials Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and cX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
*Correspondence e-mail: hkfun@usm.my
The title Schiff base compound, C17H13N3O3, crystallizes in a zwitterionic form and exists in a trans configuration about the C=N bond. The molecule is slightly twisted, the dihedral angle between the benzene ring and naphthalene ring system being 10.80 (9)°. The nitro group is twisted relative to the plane of the benzene ring [dihedral angle = 8.88 (12)°]. Bifurcated intramolecular N—H⋯N and N—H⋯O hydrogen bonds formed between iminium groups and amine N atoms and naphthalen-2-olate O atoms generate S(5) and S(6) ring motifs, respectively. In the crystal, neighbouring are linked through weak C—H⋯O interactions, giving rise to screw chains along [010]. Molecules in these chains are linked to those of an adjacent chains through N—H⋯O hydrogen bonds and weak C—H⋯O interactions, forming sheets parallel to the ac plane. O⋯C [2.895 (3) Å] short contacts and π–π interactions [centroid–centroid distance = 3.8249 (19) Å] are also observed.
Related literature
For bond-length data, see: Allen et al. (1987). For hydrogen-bond motifs, see: Bernstein et al. (1995). For background to and their applications, see: Eltayeb et al. (2007; 2008); Dao et al. (2000); Kagkelari et al. (2009); Karthikeyan et al. (2006); Sondhi et al. (2006); Sriram et al. (2006). For related structures, see: Eltayeb et al. (2009; 2010). For the stability of the temperature controller used in the data collection, see Cosier & Glazer, (1986).
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/S1600536810014923/sj2769sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810014923/sj2769Isup2.hkl
The title compound was synthesized by adding 2-hydroxy-1-naphthaldehyde (0.688 g, 4 mmol) to the solution of 4-nitrobenzene-1,2-diamine (0.306 g, 2 mmol) in ethanol (30 ml). The mixture was refluxed with stirring for 3 hrs. The resultant solid was obtained and then filtered and washed with ethanol. Red plate-shaped single crystals of the title compound suitable for x-ray
were obtained from acetone by slow evaporation at room temperature after several days.Amine and iminium H atoms were located from the difference maps and were refined isotropically. The remaining H atoms were placed in calculated positions with d(C—H) = 0.93 Å for aromatic and CH atoms and the Uiso values were constrained to be 1.2Ueq of the carrier atoms. The highest residual electron density peak is located at 0.70 Å from H4A and the deepest hole is located at 0.65 Å from C4.
Schiff base ligands are members of an important class of compounds, possessing a wide spectrum of biological and pharmacological activities such as antibacterial and antifungal (Karthikeyan et al., 2006), anticancer (Dao et al., 2000), anti-HIV (Sriram et al., 2006), activities. Apart of these activities they have also been used as ligands to study coordination chemistry (Kagkelari et al., 2009). As part of our ongoing research on the synthesis of Schiff base ligands and their complexes (Eltayeb et al., 2007; 2008; 2009; 2010), the title compound (I) was synthesized and its
was determined. The title Schiff base ligand in neutral form was tested for anti-inflammatory, analgesic and kinase inhibition activities and showed moderate anti-inflammatory and analgesic activities (Sondhi et al., 2006).The molecule of (I) (Fig. 1), C13H9BrNO2, crystallizes in a zwitterionic form with cationic iminium and anionic enolate, and exists in a trans configuration about the C═N bond [1.315 (3) Å] and the torsion angle C1–N1–C7–C8 = 175.18 (19)°. The naphthalene ring system [C8–C17] is planar with the r.m.s. 0.0069 (2) Å. The molecule is twisted with the dihedral angle between the benzene and naphthalene rings being 10.80 (9)°. The nitro group is twisted relative to the plane of the C8–C13 benzene ring with an interplanar angle of 8.88 (12)° and torsion angles O2–N3–C5–C4 = 8.4 (3) and O3–N3–C5–C4 = -171.70 (19)°. Bifurcated intramolecular N1—H1N1···N2 and N1—H1N1···O1 hydrogen bonds (Fig.1) which formed between the NH+ and amino N atom and to the naphthalen-2-olate O- generates an S(5) and S(6) ring motifs, respectively (Bernstein et al., 1995). The bond distances are in normal ranges (Allen et al., 1987) and comparable with the related structures (Eltayeb et al., 2009; 2010).
In the crystal packing, neighbouring π–π interactions with centroid···centroid distances of 3.8249 (19) Å are also observed.
are linked through weak C—H···O interactions (Table 1) giving rise to screw chains along the [010] direction (Fig. 2). Molecules in a chain are linked to those of adjacent chains through N—H···O(naphthalen-2-olate) hydrogen bonds and weak C—H···O(nitro) interactions (Table 1, Fig. 3), forming sheets parallel to the ac plane. O···C [2.895 (3) Å] short contacts andFor bond-length data, see: Allen et al. (1987). For hydrogen-bond motifs, see: Bernstein et al. (1995). For background to
and their applications, see: Eltayeb et al. (2007; 2008); Dao et al. (2000); Kagkelari et al. (2009); Karthikeyan et al. (2006); Sondhi et al. (2006); Sriram et al. (2006). For related structures, see: Eltayeb et al. (2009; 2010). For the stability of the temperature controller used in the data collection, see Cosier & Glazer, (1986).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).Fig. 1. The molecular structure of the title compound, with 50° probability displacement ellipsoids and the atom-numbering scheme. Intramolecular hydrogen bonds are shown as dashed lines." is correct. | |
Fig. 2. The crystal packing of the title compound viewed down the a, showing screw chains running along the b axis. Hydrogen bonds are shown as dashed lines. | |
Fig. 3. The crystal packing of the title compound viewed down the b, showing sheet parallel to the ac plane. Hydrogen bonds are shown as dashed lines. |
C17H13N3O3 | F(000) = 640 |
Mr = 307.30 | Dx = 1.528 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 3887 reflections |
a = 10.369 (4) Å | θ = 1.5–30.0° |
b = 4.6442 (18) Å | µ = 0.11 mm−1 |
c = 28.539 (9) Å | T = 100 K |
β = 103.548 (12)° | Plate, red |
V = 1336.1 (8) Å3 | 0.48 × 0.10 × 0.04 mm |
Z = 4 |
Bruker APEXII DUO CCD area-detector diffractometer | 3887 independent reflections |
Radiation source: sealed tube | 2341 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.057 |
φ and ω scans | θmax = 30.0°, θmin = 1.5° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −14→13 |
Tmin = 0.950, Tmax = 0.996 | k = −6→6 |
14018 measured reflections | l = −39→40 |
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)] = 0.057 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.151 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | w = 1/[σ2(Fo2) + (0.059P)2 + 0.6347P] where P = (Fo2 + 2Fc2)/3 |
3887 reflections | (Δ/σ)max = 0.001 |
220 parameters | Δρmax = 0.36 e Å−3 |
0 restraints | Δρmin = −0.30 e Å−3 |
C17H13N3O3 | V = 1336.1 (8) Å3 |
Mr = 307.30 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 10.369 (4) Å | µ = 0.11 mm−1 |
b = 4.6442 (18) Å | T = 100 K |
c = 28.539 (9) Å | 0.48 × 0.10 × 0.04 mm |
β = 103.548 (12)° |
Bruker APEXII DUO CCD area-detector diffractometer | 3887 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 2341 reflections with I > 2σ(I) |
Tmin = 0.950, Tmax = 0.996 | Rint = 0.057 |
14018 measured reflections |
R[F2 > 2σ(F2)] = 0.057 | 0 restraints |
wR(F2) = 0.151 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | Δρmax = 0.36 e Å−3 |
3887 reflections | Δρmin = −0.30 e Å−3 |
220 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 esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds 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 > 2sigma(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 | ||
O1 | 0.82332 (14) | −0.0589 (3) | 0.96873 (5) | 0.0254 (4) | |
O2 | 1.22099 (15) | −0.6304 (4) | 0.76236 (5) | 0.0338 (4) | |
O3 | 1.09865 (15) | −0.2495 (4) | 0.74798 (5) | 0.0317 (4) | |
N1 | 0.92876 (16) | −0.1176 (4) | 0.89879 (5) | 0.0198 (4) | |
H1N1 | 0.911 (3) | −0.151 (6) | 0.9315 (10) | 0.053 (8)* | |
N2 | 1.08296 (18) | −0.4892 (5) | 0.96268 (6) | 0.0250 (4) | |
H1N2 | 1.068 (2) | −0.318 (6) | 0.9746 (9) | 0.038 (7)* | |
H2N2 | 1.134 (2) | −0.630 (6) | 0.9828 (9) | 0.036 (7)* | |
N3 | 1.15214 (17) | −0.4461 (4) | 0.77485 (6) | 0.0254 (4) | |
C1 | 1.02284 (18) | −0.2851 (5) | 0.88271 (6) | 0.0189 (4) | |
C2 | 1.09971 (19) | −0.4753 (5) | 0.91675 (6) | 0.0200 (4) | |
C3 | 1.1889 (2) | −0.6596 (5) | 0.90188 (7) | 0.0231 (5) | |
H3A | 1.2383 | −0.7889 | 0.9238 | 0.028* | |
C4 | 1.2048 (2) | −0.6533 (5) | 0.85552 (7) | 0.0234 (5) | |
H4A | 1.2636 | −0.7783 | 0.8458 | 0.028* | |
C5 | 1.13185 (19) | −0.4580 (5) | 0.82357 (6) | 0.0215 (4) | |
C6 | 1.04003 (19) | −0.2757 (5) | 0.83600 (6) | 0.0216 (4) | |
H6A | 0.9907 | −0.1492 | 0.8135 | 0.026* | |
C7 | 0.84656 (19) | 0.0765 (5) | 0.87499 (6) | 0.0196 (4) | |
H7A | 0.8514 | 0.1269 | 0.8439 | 0.023* | |
C8 | 0.75161 (19) | 0.2092 (5) | 0.89575 (6) | 0.0194 (4) | |
C9 | 0.7424 (2) | 0.1231 (5) | 0.94325 (6) | 0.0211 (4) | |
C10 | 0.6390 (2) | 0.2452 (5) | 0.96265 (6) | 0.0243 (5) | |
H10A | 0.6300 | 0.1872 | 0.9929 | 0.029* | |
C11 | 0.5547 (2) | 0.4420 (5) | 0.93792 (7) | 0.0242 (5) | |
H11A | 0.4894 | 0.5173 | 0.9518 | 0.029* | |
C12 | 0.56177 (19) | 0.5396 (5) | 0.89118 (6) | 0.0208 (4) | |
C13 | 0.4720 (2) | 0.7454 (5) | 0.86662 (7) | 0.0239 (5) | |
H13A | 0.4088 | 0.8222 | 0.8814 | 0.029* | |
C14 | 0.4757 (2) | 0.8357 (5) | 0.82110 (7) | 0.0252 (5) | |
H14A | 0.4148 | 0.9701 | 0.8049 | 0.030* | |
C15 | 0.5722 (2) | 0.7223 (5) | 0.79976 (6) | 0.0230 (5) | |
H15A | 0.5758 | 0.7834 | 0.7691 | 0.028* | |
C16 | 0.66212 (19) | 0.5223 (5) | 0.82295 (6) | 0.0214 (4) | |
H16A | 0.7258 | 0.4515 | 0.8078 | 0.026* | |
C17 | 0.65970 (19) | 0.4222 (5) | 0.86945 (6) | 0.0188 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0339 (8) | 0.0264 (9) | 0.0168 (6) | 0.0063 (7) | 0.0075 (6) | 0.0041 (6) |
O2 | 0.0391 (9) | 0.0402 (11) | 0.0257 (7) | 0.0115 (8) | 0.0148 (7) | −0.0053 (7) |
O3 | 0.0429 (9) | 0.0331 (10) | 0.0218 (7) | 0.0053 (8) | 0.0127 (6) | 0.0051 (7) |
N1 | 0.0263 (8) | 0.0187 (10) | 0.0156 (7) | −0.0005 (7) | 0.0069 (6) | −0.0004 (7) |
N2 | 0.0335 (10) | 0.0246 (11) | 0.0176 (8) | 0.0047 (9) | 0.0075 (7) | 0.0008 (8) |
N3 | 0.0306 (9) | 0.0270 (11) | 0.0204 (8) | 0.0009 (8) | 0.0097 (7) | −0.0028 (7) |
C1 | 0.0249 (9) | 0.0159 (11) | 0.0177 (8) | −0.0038 (8) | 0.0085 (7) | −0.0033 (7) |
C2 | 0.0245 (9) | 0.0185 (12) | 0.0177 (8) | −0.0038 (9) | 0.0063 (7) | −0.0012 (8) |
C3 | 0.0257 (10) | 0.0203 (12) | 0.0237 (9) | 0.0012 (9) | 0.0065 (8) | 0.0008 (8) |
C4 | 0.0260 (10) | 0.0207 (12) | 0.0249 (9) | 0.0014 (9) | 0.0086 (8) | −0.0032 (8) |
C5 | 0.0250 (9) | 0.0247 (13) | 0.0160 (8) | −0.0022 (9) | 0.0075 (7) | −0.0033 (8) |
C6 | 0.0268 (9) | 0.0208 (12) | 0.0173 (8) | −0.0022 (9) | 0.0053 (7) | −0.0005 (8) |
C7 | 0.0262 (9) | 0.0171 (11) | 0.0155 (8) | −0.0028 (8) | 0.0049 (7) | −0.0001 (7) |
C8 | 0.0250 (9) | 0.0178 (11) | 0.0152 (8) | −0.0017 (8) | 0.0046 (7) | −0.0003 (8) |
C9 | 0.0284 (10) | 0.0182 (11) | 0.0165 (8) | −0.0003 (9) | 0.0045 (7) | 0.0000 (8) |
C10 | 0.0343 (11) | 0.0246 (13) | 0.0158 (8) | 0.0029 (10) | 0.0098 (8) | 0.0029 (8) |
C11 | 0.0289 (10) | 0.0241 (13) | 0.0211 (9) | 0.0016 (9) | 0.0093 (8) | −0.0007 (8) |
C12 | 0.0249 (9) | 0.0190 (12) | 0.0182 (8) | −0.0031 (9) | 0.0047 (7) | −0.0005 (8) |
C13 | 0.0270 (10) | 0.0233 (13) | 0.0218 (9) | 0.0025 (9) | 0.0063 (8) | 0.0000 (8) |
C14 | 0.0300 (10) | 0.0233 (13) | 0.0212 (9) | −0.0001 (9) | 0.0035 (8) | 0.0021 (8) |
C15 | 0.0299 (10) | 0.0232 (12) | 0.0155 (8) | −0.0023 (9) | 0.0046 (7) | 0.0008 (8) |
C16 | 0.0272 (10) | 0.0205 (12) | 0.0173 (8) | −0.0035 (9) | 0.0069 (7) | −0.0011 (8) |
C17 | 0.0238 (9) | 0.0162 (11) | 0.0160 (8) | −0.0039 (8) | 0.0039 (7) | −0.0008 (7) |
O1—C9 | 1.289 (2) | C7—C8 | 1.405 (3) |
O2—N3 | 1.220 (2) | C7—H7A | 0.9300 |
O3—N3 | 1.237 (2) | C8—C9 | 1.438 (3) |
N1—C7 | 1.315 (3) | C8—C17 | 1.454 (3) |
N1—C1 | 1.406 (2) | C9—C10 | 1.434 (3) |
N1—H1N1 | 1.00 (3) | C10—C11 | 1.344 (3) |
N2—C2 | 1.364 (2) | C10—H10A | 0.9300 |
N2—H1N2 | 0.89 (3) | C11—C12 | 1.427 (3) |
N2—H2N2 | 0.94 (3) | C11—H11A | 0.9300 |
N3—C5 | 1.455 (2) | C12—C13 | 1.402 (3) |
C1—C6 | 1.386 (2) | C12—C17 | 1.417 (3) |
C1—C2 | 1.413 (3) | C13—C14 | 1.374 (3) |
C2—C3 | 1.397 (3) | C13—H13A | 0.9300 |
C3—C4 | 1.371 (3) | C14—C15 | 1.391 (3) |
C3—H3A | 0.9300 | C14—H14A | 0.9300 |
C4—C5 | 1.380 (3) | C15—C16 | 1.372 (3) |
C4—H4A | 0.9300 | C15—H15A | 0.9300 |
C5—C6 | 1.381 (3) | C16—C17 | 1.412 (3) |
C6—H6A | 0.9300 | C16—H16A | 0.9300 |
C7—N1—C1 | 128.76 (16) | C7—C8—C9 | 118.92 (18) |
C7—N1—H1N1 | 110.5 (16) | C7—C8—C17 | 121.33 (16) |
C1—N1—H1N1 | 120.5 (16) | C9—C8—C17 | 119.71 (17) |
C2—N2—H1N2 | 113.4 (17) | O1—C9—C10 | 119.21 (17) |
C2—N2—H2N2 | 116.1 (15) | O1—C9—C8 | 122.43 (18) |
H1N2—N2—H2N2 | 120 (2) | C10—C9—C8 | 118.36 (18) |
O2—N3—O3 | 123.00 (17) | C11—C10—C9 | 121.25 (17) |
O2—N3—C5 | 118.54 (18) | C11—C10—H10A | 119.4 |
O3—N3—C5 | 118.46 (17) | C9—C10—H10A | 119.4 |
C6—C1—N1 | 123.48 (18) | C10—C11—C12 | 122.52 (19) |
C6—C1—C2 | 120.14 (18) | C10—C11—H11A | 118.7 |
N1—C1—C2 | 116.36 (16) | C12—C11—H11A | 118.7 |
N2—C2—C3 | 120.35 (19) | C13—C12—C17 | 120.24 (17) |
N2—C2—C1 | 120.83 (19) | C13—C12—C11 | 120.69 (18) |
C3—C2—C1 | 118.74 (17) | C17—C12—C11 | 119.05 (18) |
C4—C3—C2 | 121.19 (19) | C14—C13—C12 | 121.21 (19) |
C4—C3—H3A | 119.4 | C14—C13—H13A | 119.4 |
C2—C3—H3A | 119.4 | C12—C13—H13A | 119.4 |
C3—C4—C5 | 118.71 (19) | C13—C14—C15 | 118.7 (2) |
C3—C4—H4A | 120.6 | C13—C14—H14A | 120.6 |
C5—C4—H4A | 120.6 | C15—C14—H14A | 120.6 |
C4—C5—C6 | 122.52 (17) | C16—C15—C14 | 121.52 (18) |
C4—C5—N3 | 118.49 (18) | C16—C15—H15A | 119.2 |
C6—C5—N3 | 118.99 (18) | C14—C15—H15A | 119.2 |
C5—C6—C1 | 118.63 (19) | C15—C16—C17 | 121.11 (19) |
C5—C6—H6A | 120.7 | C15—C16—H16A | 119.4 |
C1—C6—H6A | 120.7 | C17—C16—H16A | 119.4 |
N1—C7—C8 | 121.09 (17) | C16—C17—C12 | 117.18 (18) |
N1—C7—H7A | 119.5 | C16—C17—C8 | 123.74 (18) |
C8—C7—H7A | 119.5 | C12—C17—C8 | 119.08 (16) |
C7—N1—C1—C6 | −2.5 (3) | C17—C8—C9—O1 | −178.14 (19) |
C7—N1—C1—C2 | 179.1 (2) | C7—C8—C9—C10 | −175.65 (19) |
C6—C1—C2—N2 | −179.3 (2) | C17—C8—C9—C10 | 2.0 (3) |
N1—C1—C2—N2 | −0.8 (3) | O1—C9—C10—C11 | 178.1 (2) |
C6—C1—C2—C3 | −2.4 (3) | C8—C9—C10—C11 | −2.0 (3) |
N1—C1—C2—C3 | 176.07 (18) | C9—C10—C11—C12 | 0.5 (3) |
N2—C2—C3—C4 | 178.5 (2) | C10—C11—C12—C13 | −179.9 (2) |
C1—C2—C3—C4 | 1.6 (3) | C10—C11—C12—C17 | 1.1 (3) |
C2—C3—C4—C5 | 0.8 (3) | C17—C12—C13—C14 | 0.6 (3) |
C3—C4—C5—C6 | −2.4 (3) | C11—C12—C13—C14 | −178.3 (2) |
C3—C4—C5—N3 | 178.11 (19) | C12—C13—C14—C15 | −1.0 (3) |
O2—N3—C5—C4 | 8.4 (3) | C13—C14—C15—C16 | 0.5 (3) |
O3—N3—C5—C4 | −171.70 (19) | C14—C15—C16—C17 | 0.4 (3) |
O2—N3—C5—C6 | −171.2 (2) | C15—C16—C17—C12 | −0.8 (3) |
O3—N3—C5—C6 | 8.8 (3) | C15—C16—C17—C8 | 179.5 (2) |
C4—C5—C6—C1 | 1.5 (3) | C13—C12—C17—C16 | 0.3 (3) |
N3—C5—C6—C1 | −178.97 (19) | C11—C12—C17—C16 | 179.27 (19) |
N1—C1—C6—C5 | −177.46 (19) | C13—C12—C17—C8 | 179.96 (19) |
C2—C1—C6—C5 | 0.9 (3) | C11—C12—C17—C8 | −1.0 (3) |
C1—N1—C7—C8 | 175.18 (19) | C7—C8—C17—C16 | −3.2 (3) |
N1—C7—C8—C9 | −1.9 (3) | C9—C8—C17—C16 | 179.21 (19) |
N1—C7—C8—C17 | −179.45 (19) | C7—C8—C17—C12 | 177.07 (19) |
C7—C8—C9—O1 | 4.3 (3) | C9—C8—C17—C12 | −0.5 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N1···O1 | 1.01 (3) | 1.61 (3) | 2.505 (2) | 146 (3) |
N1—H1N1···N2 | 1.01 (3) | 2.39 (3) | 2.737 (3) | 100 (2) |
N2—H1N2···O1i | 0.89 (3) | 2.47 (3) | 3.219 (3) | 142.0 (19) |
N2—H2N2···O1ii | 0.95 (3) | 1.98 (3) | 2.879 (3) | 158.6 (19) |
C6—H6A···O3iii | 0.93 | 2.57 | 3.489 (3) | 168 |
C15—H15A···O2iv | 0.93 | 2.51 | 3.161 (3) | 127 |
Symmetry codes: (i) −x+2, −y, −z+2; (ii) −x+2, −y−1, −z+2; (iii) −x+2, y+1/2, −z+3/2; (iv) −x+2, y+3/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | C17H13N3O3 |
Mr | 307.30 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 10.369 (4), 4.6442 (18), 28.539 (9) |
β (°) | 103.548 (12) |
V (Å3) | 1336.1 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.11 |
Crystal size (mm) | 0.48 × 0.10 × 0.04 |
Data collection | |
Diffractometer | Bruker APEXII DUO CCD area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.950, 0.996 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14018, 3887, 2341 |
Rint | 0.057 |
(sin θ/λ)max (Å−1) | 0.703 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.057, 0.151, 1.02 |
No. of reflections | 3887 |
No. of parameters | 220 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.36, −0.30 |
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 |
N1—H1N1···O1 | 1.01 (3) | 1.61 (3) | 2.505 (2) | 146 (3) |
N1—H1N1···N2 | 1.01 (3) | 2.39 (3) | 2.737 (3) | 100 (2) |
N2—H1N2···O1i | 0.89 (3) | 2.47 (3) | 3.219 (3) | 142.0 (19) |
N2—H2N2···O1ii | 0.95 (3) | 1.98 (3) | 2.879 (3) | 158.6 (19) |
C6—H6A···O3iii | 0.93 | 2.57 | 3.489 (3) | 168 |
C15—H15A···O2iv | 0.93 | 2.51 | 3.161 (3) | 127 |
Symmetry codes: (i) −x+2, −y, −z+2; (ii) −x+2, −y−1, −z+2; (iii) −x+2, y+1/2, −z+3/2; (iv) −x+2, y+3/2, −z+3/2. |
Acknowledgements
The authors thank the Malaysian Government, the Ministry of Science, Technology and Innovation (MOSTI) and Universiti Sains Malaysia for the RU research grants (1001/PKIMIA/815002 and 1001/PKIMIA/811120). AMF thanks the Libyan Government for providing a scholarship and Dr Naser Eltaher Eltayeb for his useful suggestions. The authors also thank the Malaysian Government and Universiti Sains Malaysia for the Research University Golden Goose grant No. 1001/PFIZIK/811012.
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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.
Schiff base ligands are members of an important class of compounds, possessing a wide spectrum of biological and pharmacological activities such as antibacterial and antifungal (Karthikeyan et al., 2006), anticancer (Dao et al., 2000), anti-HIV (Sriram et al., 2006), activities. Apart of these activities they have also been used as ligands to study coordination chemistry (Kagkelari et al., 2009). As part of our ongoing research on the synthesis of Schiff base ligands and their complexes (Eltayeb et al., 2007; 2008; 2009; 2010), the title compound (I) was synthesized and its crystal structure was determined. The title Schiff base ligand in neutral form was tested for anti-inflammatory, analgesic and kinase inhibition activities and showed moderate anti-inflammatory and analgesic activities (Sondhi et al., 2006).
The molecule of (I) (Fig. 1), C13H9BrNO2, crystallizes in a zwitterionic form with cationic iminium and anionic enolate, and exists in a trans configuration about the C═N bond [1.315 (3) Å] and the torsion angle C1–N1–C7–C8 = 175.18 (19)°. The naphthalene ring system [C8–C17] is planar with the r.m.s. 0.0069 (2) Å. The molecule is twisted with the dihedral angle between the benzene and naphthalene rings being 10.80 (9)°. The nitro group is twisted relative to the plane of the C8–C13 benzene ring with an interplanar angle of 8.88 (12)° and torsion angles O2–N3–C5–C4 = 8.4 (3) and O3–N3–C5–C4 = -171.70 (19)°. Bifurcated intramolecular N1—H1N1···N2 and N1—H1N1···O1 hydrogen bonds (Fig.1) which formed between the NH+ and amino N atom and to the naphthalen-2-olate O- generates an S(5) and S(6) ring motifs, respectively (Bernstein et al., 1995). The bond distances are in normal ranges (Allen et al., 1987) and comparable with the related structures (Eltayeb et al., 2009; 2010).
In the crystal packing, neighbouring zwitterions are linked through weak C—H···O interactions (Table 1) giving rise to screw chains along the [010] direction (Fig. 2). Molecules in a chain are linked to those of adjacent chains through N—H···O(naphthalen-2-olate) hydrogen bonds and weak C—H···O(nitro) interactions (Table 1, Fig. 3), forming sheets parallel to the ac plane. O···C [2.895 (3) Å] short contacts and π–π interactions with centroid···centroid distances of 3.8249 (19) Å are also observed.