organic compounds
2,7.011,15]hexadeca-1(16),2,4,6,9,11(15),12-heptaen-8-ylidene]propandinitrile
of 2-[12-methyl-14-phenyl-10,13,14,16-tetraazatetracyclo[7.7.0.0aDepartment of Chemistry, Tulane University, New Orleans, LA 70118, USA, bChemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England, cChemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt, dDepartment of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey, eDepartment of Chemistry, Faculty of Science, Assiut University, 71515 Assiut, Egypt, and fKirkuk University, College of Science, Department of Chemistry, Kirkuk, Iraq
*Correspondence e-mail: shaabankamel@yahoo.com
In the title molecule, C22H12N6, the fused tetracyclic core shows a small lengthwise twist as indicated by the dihedral of 2.7 (2)° between the outer rings. In the crystal, molecules stack along the b-axis direction via offset π-stacking [centroid–centroid distances = 3.5282 (13) and 3.5597 (14) Å] with the stacks weakly associated through C—H⋯N hydrogen bonds. The phenyl ring is rotationally disordered over two orientations with an occupancy ratio of 0.516 (4):0.484 (4).
Keywords: crystal structure; heptaene; propandinitrile; pyrazine scaffold compound; fused tetracyclic core.
CCDC reference: 1032263
1. Related literature
For the biological properties of pyrazine scaffold compounds, see: Kaliszan et al. (1985); Makino et al. (1990); Emary & Ibrahim (2006); Silva et al. (2010); Rusinov et al. (2005); Johnston & Kau (1993); Myadaraboina et al. (2010); Metobo et al. (2006). For use of pyrazines in industrial chemistry see: Rangnekar & Dhamnaskar, 1990). For the preparation of the title compound, see: El-Emary & El-Kashef (2013)
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: APEX2 (Bruker, 2014); cell SAINT (Bruker, 2014); data reduction: SAINT; program(s) used to solve structure: SHELXT (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2012); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).
Supporting information
CCDC reference: 1032263
10.1107/S1600536814024167/su5012sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536814024167/su5012Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536814024167/su5012Isup3.cml
The title compound was prepared according to the reported procedure (El-Emary & El-Kashef, 2013). Orange crystals suitable for X-ray diffraction were obtained by recrystallization of the reaction product from dimethylformamide (m.p. 587–589 K).
C-bound H atoms were placed in calculated positions and treated as riding atoms, with C—H = 0.95–0.98 Å and with Uiso(H) = 1.5Ueq(C) for methyl H atoms and = 1.2Ueq(C) for other H atoms. The phenyl ring attached to N1 is rotationally disordered over two sites with an occupancy ratio of 0.516 (4):0.484 (4). The components of the disorder were refined as rigid hexagons.
Data collection: APEX2 (Bruker, 2014); cell
SAINT (Bruker, 2014); data reduction: SAINT (Bruker, 2014); program(s) used to solve structure: SHELXT (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2012); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).The molecular structure of the title molecule, showing the atom labelling. Displacement ellipsoids are drawn at the 50% probability level. Portions of two neighboring stacks showing the offset π-stacking and C—H···N interactions (Table 1) as green and blue dotted line, respectively. Crystal packing viewed along the b axis showing stacks of molecules connected by the weak C—H···N interactions (blue dotted lines; see Table 1 for details). |
C22H12N6 | F(000) = 1488 |
Mr = 360.38 | Dx = 1.398 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
a = 35.968 (5) Å | Cell parameters from 4540 reflections |
b = 4.6483 (6) Å | θ = 2.3–27.4° |
c = 26.596 (3) Å | µ = 0.09 mm−1 |
β = 129.6130 (12)° | T = 150 K |
V = 3425.5 (8) Å3 | Column, orange |
Z = 8 | 0.21 × 0.13 × 0.07 mm |
Bruker SMART APEX CCD diffractometer | 3921 independent reflections |
Radiation source: fine-focus sealed tube | 2489 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.050 |
Detector resolution: 8.3660 pixels mm-1 | θmax = 27.5°, θmin = 2.0° |
ϕ and ω scans | h = −46→46 |
Absorption correction: multi-scan (SADABS; Bruker, 2014) | k = −6→6 |
Tmin = 0.77, Tmax = 0.99 | l = −34→34 |
15751 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)] = 0.053 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.136 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0537P)2 + 1.9123P] where P = (Fo2 + 2Fc2)/3 |
3921 reflections | (Δ/σ)max = 0.001 |
249 parameters | Δρmax = 0.31 e Å−3 |
1 restraint | Δρmin = −0.20 e Å−3 |
C22H12N6 | V = 3425.5 (8) Å3 |
Mr = 360.38 | Z = 8 |
Monoclinic, C2/c | Mo Kα radiation |
a = 35.968 (5) Å | µ = 0.09 mm−1 |
b = 4.6483 (6) Å | T = 150 K |
c = 26.596 (3) Å | 0.21 × 0.13 × 0.07 mm |
β = 129.6130 (12)° |
Bruker SMART APEX CCD diffractometer | 3921 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2014) | 2489 reflections with I > 2σ(I) |
Tmin = 0.77, Tmax = 0.99 | Rint = 0.050 |
15751 measured reflections |
R[F2 > 2σ(F2)] = 0.053 | 1 restraint |
wR(F2) = 0.136 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.31 e Å−3 |
3921 reflections | Δρmin = −0.20 e Å−3 |
249 parameters |
Experimental. The diffraction data were collected in three sets of 400 frames (0.5° width in ω) at ϕ = 0, 120 and 240°. A scan time of 90 sec/frame was used. |
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. H-atoms attached to carbon were placed in calculated positions (C—H = 0.95 - 0.98 Å). All were included as riding contributions with isotropic displacement parameters 1.2 - 1.5 times those of the attached atoms. The phenyl ring attached to N1 is rotationally disordered over two sites in approximately equal amounts. The components of the disorder were refined as rigid hexagons. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
N1 | 0.69392 (6) | 0.2255 (4) | 0.36211 (8) | 0.0427 (4) | |
N2 | 0.66369 (7) | 0.0716 (4) | 0.36798 (9) | 0.0482 (5) | |
N3 | 0.68329 (6) | 0.5915 (3) | 0.28798 (8) | 0.0385 (4) | |
N4 | 0.58234 (6) | 0.5174 (4) | 0.23053 (8) | 0.0418 (4) | |
N5 | 0.46527 (7) | 0.6261 (5) | 0.12918 (10) | 0.0679 (6) | |
N6 | 0.46809 (7) | 1.2638 (5) | 0.01592 (10) | 0.0657 (6) | |
C1 | 0.74396 (18) | 0.1886 (11) | 0.4101 (2) | 0.0444 (5) | 0.516 (4) |
C2 | 0.7750 (3) | 0.2928 (12) | 0.4002 (2) | 0.0565 (14) | 0.516 (4) |
H2 | 0.7624 | 0.3876 | 0.3605 | 0.068* | 0.516 (4) |
C3 | 0.8246 (2) | 0.2582 (13) | 0.4482 (3) | 0.0568 (13) | 0.516 (4) |
H3 | 0.8458 | 0.3294 | 0.4414 | 0.068* | 0.516 (4) |
C4 | 0.84309 (16) | 0.1195 (12) | 0.5063 (3) | 0.0611 (7) | 0.516 (4) |
H4 | 0.8770 | 0.0959 | 0.5391 | 0.073* | 0.516 (4) |
C5 | 0.81201 (19) | 0.0153 (11) | 0.5163 (2) | 0.0596 (12) | 0.516 (4) |
H5 | 0.8246 | −0.0795 | 0.5559 | 0.072* | 0.516 (4) |
C6 | 0.76244 (18) | 0.0498 (11) | 0.4682 (2) | 0.0551 (11) | 0.516 (4) |
H6 | 0.7412 | −0.0214 | 0.4750 | 0.066* | 0.516 (4) |
C1A | 0.74487 (19) | 0.1788 (12) | 0.4091 (2) | 0.0444 (5) | 0.484 (4) |
C2A | 0.7774 (3) | 0.3742 (10) | 0.4168 (3) | 0.0565 (14) | 0.484 (4) |
H2A | 0.7660 | 0.5350 | 0.3884 | 0.068* | 0.484 (4) |
C3A | 0.8267 (3) | 0.3344 (11) | 0.4661 (4) | 0.0568 (13) | 0.484 (4) |
H3A | 0.8490 | 0.4679 | 0.4714 | 0.068* | 0.484 (4) |
C4A | 0.84344 (17) | 0.0991 (13) | 0.5077 (3) | 0.0611 (7) | 0.484 (4) |
H4A | 0.8771 | 0.0719 | 0.5414 | 0.073* | 0.484 (4) |
C5A | 0.8109 (2) | −0.0963 (11) | 0.5000 (2) | 0.0596 (12) | 0.484 (4) |
H5A | 0.8223 | −0.2571 | 0.5284 | 0.072* | 0.484 (4) |
C6A | 0.76159 (19) | −0.0564 (11) | 0.4507 (3) | 0.0551 (11) | 0.484 (4) |
H6A | 0.7393 | −0.1900 | 0.4454 | 0.066* | 0.484 (4) |
C7 | 0.66759 (7) | 0.4096 (4) | 0.31061 (9) | 0.0385 (5) | |
C8 | 0.61906 (7) | 0.3724 (4) | 0.28314 (10) | 0.0395 (5) | |
C9 | 0.61930 (8) | 0.1579 (4) | 0.32169 (11) | 0.0458 (5) | |
C10 | 0.57752 (8) | 0.0445 (5) | 0.31473 (12) | 0.0575 (6) | |
H10A | 0.5884 | −0.1118 | 0.3461 | 0.086* | |
H10B | 0.5530 | −0.0286 | 0.2703 | 0.086* | |
H10C | 0.5636 | 0.1991 | 0.3232 | 0.086* | |
C11 | 0.64643 (7) | 0.7328 (4) | 0.23600 (9) | 0.0360 (4) | |
C12 | 0.64814 (7) | 0.9456 (4) | 0.19683 (9) | 0.0368 (4) | |
C13 | 0.68659 (7) | 1.0487 (4) | 0.20208 (10) | 0.0424 (5) | |
H13 | 0.7185 | 0.9834 | 0.2359 | 0.051* | |
C14 | 0.67732 (8) | 1.2503 (5) | 0.15671 (10) | 0.0470 (5) | |
H14 | 0.7032 | 1.3228 | 0.1594 | 0.056* | |
C15 | 0.63093 (8) | 1.3466 (5) | 0.10772 (10) | 0.0480 (5) | |
H15 | 0.6255 | 1.4850 | 0.0774 | 0.058* | |
C16 | 0.59220 (7) | 1.2445 (4) | 0.10213 (10) | 0.0440 (5) | |
H16 | 0.5604 | 1.3125 | 0.0684 | 0.053* | |
C17 | 0.60064 (7) | 1.0419 (4) | 0.14650 (9) | 0.0387 (5) | |
C18 | 0.56731 (7) | 0.8908 (4) | 0.15189 (9) | 0.0389 (5) | |
C19 | 0.59741 (7) | 0.6983 (4) | 0.20825 (9) | 0.0379 (4) | |
C20 | 0.51870 (7) | 0.9165 (4) | 0.11397 (10) | 0.0421 (5) | |
C21 | 0.49030 (8) | 0.7526 (5) | 0.12444 (11) | 0.0499 (5) | |
C22 | 0.49111 (8) | 1.1104 (5) | 0.05965 (11) | 0.0491 (5) |
U11 | U22 | U33 | U12 | U13 | U23 | |
N1 | 0.0487 (10) | 0.0408 (9) | 0.0452 (10) | 0.0038 (8) | 0.0331 (9) | 0.0037 (8) |
N2 | 0.0606 (12) | 0.0437 (10) | 0.0563 (11) | 0.0011 (9) | 0.0447 (11) | 0.0022 (9) |
N3 | 0.0421 (9) | 0.0351 (9) | 0.0406 (9) | 0.0017 (7) | 0.0274 (8) | −0.0007 (7) |
N4 | 0.0452 (10) | 0.0383 (9) | 0.0471 (10) | −0.0017 (8) | 0.0318 (9) | −0.0063 (8) |
N5 | 0.0494 (12) | 0.0848 (16) | 0.0745 (15) | −0.0056 (11) | 0.0418 (12) | −0.0071 (12) |
N6 | 0.0538 (12) | 0.0703 (14) | 0.0579 (13) | 0.0127 (11) | 0.0287 (11) | 0.0066 (12) |
C1 | 0.0527 (13) | 0.0398 (12) | 0.0459 (12) | 0.0081 (10) | 0.0339 (11) | 0.0016 (9) |
C2 | 0.0545 (17) | 0.058 (3) | 0.060 (3) | 0.018 (2) | 0.037 (2) | 0.020 (3) |
C3 | 0.0543 (17) | 0.058 (3) | 0.063 (4) | 0.015 (2) | 0.040 (2) | 0.006 (2) |
C4 | 0.0583 (15) | 0.0649 (17) | 0.0510 (14) | 0.0200 (13) | 0.0306 (13) | 0.0071 (13) |
C5 | 0.073 (2) | 0.056 (3) | 0.047 (3) | 0.017 (3) | 0.038 (2) | 0.008 (2) |
C6 | 0.0618 (18) | 0.054 (3) | 0.050 (3) | 0.006 (2) | 0.036 (2) | 0.006 (2) |
C1A | 0.0527 (13) | 0.0398 (12) | 0.0459 (12) | 0.0081 (10) | 0.0339 (11) | 0.0016 (9) |
C2A | 0.0545 (17) | 0.058 (3) | 0.060 (3) | 0.018 (2) | 0.037 (2) | 0.020 (3) |
C3A | 0.0543 (17) | 0.058 (3) | 0.063 (4) | 0.015 (2) | 0.040 (2) | 0.006 (2) |
C4A | 0.0583 (15) | 0.0649 (17) | 0.0510 (14) | 0.0200 (13) | 0.0306 (13) | 0.0071 (13) |
C5A | 0.073 (2) | 0.056 (3) | 0.047 (3) | 0.017 (3) | 0.038 (2) | 0.008 (2) |
C6A | 0.0618 (18) | 0.054 (3) | 0.050 (3) | 0.006 (2) | 0.036 (2) | 0.006 (2) |
C7 | 0.0458 (11) | 0.0339 (10) | 0.0412 (11) | 0.0034 (9) | 0.0302 (10) | −0.0016 (9) |
C8 | 0.0460 (12) | 0.0344 (10) | 0.0469 (12) | 0.0009 (9) | 0.0337 (10) | −0.0038 (9) |
C9 | 0.0551 (13) | 0.0421 (11) | 0.0521 (13) | −0.0012 (10) | 0.0398 (12) | −0.0045 (10) |
C10 | 0.0674 (15) | 0.0569 (14) | 0.0712 (16) | −0.0045 (12) | 0.0548 (14) | −0.0006 (12) |
C11 | 0.0381 (11) | 0.0328 (10) | 0.0377 (10) | 0.0001 (8) | 0.0245 (9) | −0.0044 (8) |
C12 | 0.0396 (11) | 0.0326 (10) | 0.0381 (10) | −0.0005 (8) | 0.0247 (9) | −0.0043 (8) |
C13 | 0.0393 (11) | 0.0429 (11) | 0.0410 (11) | −0.0017 (9) | 0.0238 (10) | −0.0040 (9) |
C14 | 0.0468 (12) | 0.0497 (12) | 0.0511 (13) | −0.0024 (10) | 0.0342 (11) | −0.0006 (10) |
C15 | 0.0541 (13) | 0.0479 (12) | 0.0446 (12) | 0.0024 (10) | 0.0327 (11) | 0.0035 (10) |
C16 | 0.0442 (12) | 0.0431 (11) | 0.0404 (11) | 0.0038 (10) | 0.0249 (10) | −0.0008 (9) |
C17 | 0.0392 (11) | 0.0352 (10) | 0.0407 (11) | 0.0004 (8) | 0.0250 (9) | −0.0051 (9) |
C18 | 0.0410 (11) | 0.0352 (10) | 0.0409 (11) | −0.0011 (8) | 0.0262 (10) | −0.0088 (9) |
C19 | 0.0394 (11) | 0.0345 (10) | 0.0409 (11) | 0.0003 (8) | 0.0261 (10) | −0.0042 (8) |
C20 | 0.0391 (11) | 0.0420 (11) | 0.0411 (11) | 0.0023 (9) | 0.0238 (10) | −0.0052 (9) |
C21 | 0.0392 (12) | 0.0558 (13) | 0.0516 (13) | −0.0009 (11) | 0.0274 (11) | −0.0101 (11) |
C22 | 0.0412 (12) | 0.0528 (13) | 0.0481 (13) | 0.0026 (11) | 0.0261 (11) | −0.0072 (11) |
N1—C7 | 1.361 (2) | C4A—C5A | 1.3900 |
N1—N2 | 1.391 (2) | C4A—H4A | 0.9500 |
N1—C1 | 1.403 (5) | C5A—C6A | 1.3900 |
N1—C1A | 1.430 (5) | C5A—H5A | 0.9500 |
N2—C9 | 1.311 (3) | C6A—H6A | 0.9500 |
N3—C11 | 1.328 (2) | C7—C8 | 1.409 (3) |
N3—C7 | 1.353 (2) | C8—C9 | 1.426 (3) |
N4—C19 | 1.327 (2) | C9—C10 | 1.489 (3) |
N4—C8 | 1.342 (3) | C10—H10A | 0.9800 |
N5—C21 | 1.147 (3) | C10—H10B | 0.9800 |
N6—C22 | 1.148 (3) | C10—H10C | 0.9800 |
C1—C2 | 1.3900 | C11—C19 | 1.421 (3) |
C1—C6 | 1.3900 | C11—C12 | 1.466 (3) |
C2—C3 | 1.3900 | C12—C13 | 1.384 (3) |
C2—H2 | 0.9500 | C12—C17 | 1.413 (3) |
C3—C4 | 1.3900 | C13—C14 | 1.390 (3) |
C3—H3 | 0.9500 | C13—H13 | 0.9500 |
C4—C5 | 1.3900 | C14—C15 | 1.382 (3) |
C4—H4 | 0.9500 | C14—H14 | 0.9500 |
C5—C6 | 1.3900 | C15—C16 | 1.387 (3) |
C5—H5 | 0.9500 | C15—H15 | 0.9500 |
C6—H6 | 0.9500 | C16—C17 | 1.384 (3) |
C1A—C2A | 1.3900 | C16—H16 | 0.9500 |
C1A—C6A | 1.3900 | C17—C18 | 1.474 (3) |
C2A—C3A | 1.3900 | C18—C20 | 1.356 (3) |
C2A—H2A | 0.9500 | C18—C19 | 1.466 (3) |
C3A—C4A | 1.3900 | C20—C22 | 1.434 (3) |
C3A—H3A | 0.9500 | C20—C21 | 1.437 (3) |
C7—N1—N2 | 110.14 (16) | N1—C7—C8 | 106.37 (17) |
C7—N1—C1 | 131.2 (3) | N4—C8—C7 | 123.33 (18) |
N2—N1—C1 | 118.4 (3) | N4—C8—C9 | 130.67 (19) |
C7—N1—C1A | 131.0 (3) | C7—C8—C9 | 105.99 (18) |
N2—N1—C1A | 118.8 (3) | N2—C9—C8 | 109.54 (18) |
C9—N2—N1 | 107.95 (16) | N2—C9—C10 | 122.5 (2) |
C11—N3—C7 | 110.46 (16) | C8—C9—C10 | 128.0 (2) |
C19—N4—C8 | 111.93 (16) | C9—C10—H10A | 109.5 |
C2—C1—C6 | 120.0 | C9—C10—H10B | 109.5 |
C2—C1—N1 | 120.3 (4) | H10A—C10—H10B | 109.5 |
C6—C1—N1 | 119.7 (4) | C9—C10—H10C | 109.5 |
C3—C2—C1 | 120.0 | H10A—C10—H10C | 109.5 |
C3—C2—H2 | 120.0 | H10B—C10—H10C | 109.5 |
C1—C2—H2 | 120.0 | N3—C11—C19 | 124.72 (17) |
C2—C3—C4 | 120.0 | N3—C11—C12 | 127.38 (17) |
C2—C3—H3 | 120.0 | C19—C11—C12 | 107.90 (16) |
C4—C3—H3 | 120.0 | C13—C12—C17 | 120.84 (18) |
C5—C4—C3 | 120.0 | C13—C12—C11 | 130.85 (18) |
C5—C4—H4 | 120.0 | C17—C12—C11 | 108.30 (16) |
C3—C4—H4 | 120.0 | C12—C13—C14 | 118.35 (19) |
C6—C5—C4 | 120.0 | C12—C13—H13 | 120.8 |
C6—C5—H5 | 120.0 | C14—C13—H13 | 120.8 |
C4—C5—H5 | 120.0 | C15—C14—C13 | 120.9 (2) |
C5—C6—C1 | 120.0 | C15—C14—H14 | 119.5 |
C5—C6—H6 | 120.0 | C13—C14—H14 | 119.5 |
C1—C6—H6 | 120.0 | C14—C15—C16 | 121.1 (2) |
C2A—C1A—C6A | 120.0 | C14—C15—H15 | 119.4 |
C2A—C1A—N1 | 121.3 (4) | C16—C15—H15 | 119.4 |
C6A—C1A—N1 | 118.5 (4) | C17—C16—C15 | 118.82 (19) |
C1A—C2A—C3A | 120.0 | C17—C16—H16 | 120.6 |
C1A—C2A—H2A | 120.0 | C15—C16—H16 | 120.6 |
C3A—C2A—H2A | 120.0 | C16—C17—C12 | 119.95 (18) |
C4A—C3A—C2A | 120.0 | C16—C17—C18 | 131.13 (18) |
C4A—C3A—H3A | 120.0 | C12—C17—C18 | 108.91 (17) |
C2A—C3A—H3A | 120.0 | C20—C18—C19 | 125.14 (18) |
C5A—C4A—C3A | 120.0 | C20—C18—C17 | 128.95 (19) |
C5A—C4A—H4A | 120.0 | C19—C18—C17 | 105.91 (16) |
C3A—C4A—H4A | 120.0 | N4—C19—C11 | 124.33 (18) |
C4A—C5A—C6A | 120.0 | N4—C19—C18 | 126.69 (17) |
C4A—C5A—H5A | 120.0 | C11—C19—C18 | 108.98 (17) |
C6A—C5A—H5A | 120.0 | C18—C20—C22 | 122.7 (2) |
C5A—C6A—C1A | 120.0 | C18—C20—C21 | 123.22 (19) |
C5A—C6A—H6A | 120.0 | C22—C20—C21 | 114.06 (18) |
C1A—C6A—H6A | 120.0 | N5—C21—C20 | 176.0 (2) |
N3—C7—N1 | 128.40 (18) | N6—C22—C20 | 178.4 (2) |
N3—C7—C8 | 125.22 (18) | ||
C7—N1—N2—C9 | −0.6 (2) | N3—C7—C8—C9 | 178.93 (17) |
C1—N1—N2—C9 | 174.4 (2) | N1—C7—C8—C9 | 0.0 (2) |
C1A—N1—N2—C9 | 177.4 (3) | N1—N2—C9—C8 | 0.6 (2) |
C7—N1—C1—C2 | −18.7 (4) | N1—N2—C9—C10 | −177.98 (18) |
N2—N1—C1—C2 | 167.6 (2) | N4—C8—C9—N2 | 178.80 (19) |
C1A—N1—C1—C2 | 69 (11) | C7—C8—C9—N2 | −0.3 (2) |
C7—N1—C1—C6 | 160.6 (3) | N4—C8—C9—C10 | −2.8 (4) |
N2—N1—C1—C6 | −13.1 (4) | C7—C8—C9—C10 | 178.1 (2) |
C1A—N1—C1—C6 | −112 (11) | C7—N3—C11—C19 | 0.2 (3) |
C6—C1—C2—C3 | 0.0 | C7—N3—C11—C12 | −179.09 (17) |
N1—C1—C2—C3 | 179.3 (4) | N3—C11—C12—C13 | 1.4 (3) |
C1—C2—C3—C4 | 0.0 | C19—C11—C12—C13 | −177.97 (19) |
C2—C3—C4—C5 | 0.0 | N3—C11—C12—C17 | −179.69 (18) |
C3—C4—C5—C6 | 0.0 | C19—C11—C12—C17 | 0.9 (2) |
C4—C5—C6—C1 | 0.0 | C17—C12—C13—C14 | 0.2 (3) |
C2—C1—C6—C5 | 0.0 | C11—C12—C13—C14 | 178.95 (19) |
N1—C1—C6—C5 | −179.3 (4) | C12—C13—C14—C15 | 0.3 (3) |
C7—N1—C1A—C2A | 14.8 (4) | C13—C14—C15—C16 | −0.3 (3) |
N2—N1—C1A—C2A | −162.6 (3) | C14—C15—C16—C17 | −0.3 (3) |
C1—N1—C1A—C2A | −80 (11) | C15—C16—C17—C12 | 0.8 (3) |
C7—N1—C1A—C6A | −169.9 (3) | C15—C16—C17—C18 | −178.22 (19) |
N2—N1—C1A—C6A | 12.7 (4) | C13—C12—C17—C16 | −0.8 (3) |
C1—N1—C1A—C6A | 95 (11) | C11—C12—C17—C16 | −179.76 (17) |
C6A—C1A—C2A—C3A | 0.0 | C13—C12—C17—C18 | 178.45 (17) |
N1—C1A—C2A—C3A | 175.2 (4) | C11—C12—C17—C18 | −0.6 (2) |
C1A—C2A—C3A—C4A | 0.0 | C16—C17—C18—C20 | −0.9 (3) |
C2A—C3A—C4A—C5A | 0.0 | C12—C17—C18—C20 | 179.99 (19) |
C3A—C4A—C5A—C6A | 0.0 | C16—C17—C18—C19 | 179.1 (2) |
C4A—C5A—C6A—C1A | 0.0 | C12—C17—C18—C19 | 0.0 (2) |
C2A—C1A—C6A—C5A | 0.0 | C8—N4—C19—C11 | 0.8 (3) |
N1—C1A—C6A—C5A | −175.3 (4) | C8—N4—C19—C18 | −179.82 (17) |
C11—N3—C7—N1 | 179.02 (18) | N3—C11—C19—N4 | −0.8 (3) |
C11—N3—C7—C8 | 0.3 (3) | C12—C11—C19—N4 | 178.58 (17) |
N2—N1—C7—N3 | −178.56 (18) | N3—C11—C19—C18 | 179.68 (17) |
C1—N1—C7—N3 | 7.3 (4) | C12—C11—C19—C18 | −0.9 (2) |
C1A—N1—C7—N3 | 3.8 (4) | C20—C18—C19—N4 | 1.1 (3) |
N2—N1—C7—C8 | 0.4 (2) | C17—C18—C19—N4 | −178.91 (18) |
C1—N1—C7—C8 | −173.8 (3) | C20—C18—C19—C11 | −179.43 (18) |
C1A—N1—C7—C8 | −177.2 (3) | C17—C18—C19—C11 | 0.6 (2) |
C19—N4—C8—C7 | −0.3 (3) | C19—C18—C20—C22 | 179.49 (18) |
C19—N4—C8—C9 | −179.28 (19) | C17—C18—C20—C22 | −0.5 (3) |
N3—C7—C8—N4 | −0.3 (3) | C19—C18—C20—C21 | −0.6 (3) |
N1—C7—C8—N4 | −179.24 (17) | C17—C18—C20—C21 | 179.43 (18) |
D—H···A | D—H | H···A | D···A | D—H···A |
C10—H10A···N5i | 0.98 | 2.69 | 3.362 (3) | 126 |
Symmetry code: (i) −x+1, y−1, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C10—H10A···N5i | 0.98 | 2.69 | 3.362 (3) | 126 |
Symmetry code: (i) −x+1, y−1, −z+1/2. |
Acknowledgements
JTM thanks Tulane University for support of the Tulane Crystallography Laboratory. SKM and HMSE would like to thank Professor T. El-Emary, Assiut University, for his contribution to this study.
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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.
Over recent years there has been an increasing interest in the chemistry of pyrazine scaffold compounds due to their biological significance. Pyrazine ring is found in numerous pharmaceutically active compounds such as analgesic (Kaliszan et al., 1985), antiallergic (Makino et al., 1990), antibacterial (Emary & Ibrahim 2006), anti-inflammatory (Silva et al., 2010), antiviral (Rusinov et al., 2005), diuretic (Johnston & Kau, 1993), anticancer (Myadaraboina et al., 2010), and anti-HIV (Metobo et al., 2006) medications. Other pyrazine derivatives are also used as fluorescent dyes or dispersed dyes for polyester fibers (Rangnekar & Dhamnaskar, 1990). As part of our investigations of pyrazine derivatives to compare their chemical and biological activities, we have undertaken the X-ray crystal structure analysis of the title compound.
In the title compound, Fig. 1, the fused 4-ring core of the title molecule is nearly planar with only a slight lengthwise twist as indicated by the dihedral angle between the N1/N2/C7/C8/C9 and C12–C17 rings of 2.7 (2)°.
In the crystal, molecules pack in columns along [010] which involve offset π-stacking in which atom N2 is 3.36 (4) Å from the centroid of the N3/C11/C19/N4/C8/C7 ring one unit cell translation in b above it while C17 is 3.41 (4) Å from the centroid of the N3/C11/C19/N4/C8/C7 ring one unit cell translation in b below it (Fig. 2). Adjacent stacks are weakly associated via C—H···N hydrogen bonds (Fig. 3 and Table 1) and are inclined at ca 43.5° in opposite directions from (010).