organic compounds
Tris[4-(4-nitrophenyl)-3-aza-3-butenyl]amine: π-stacked chains of hydrogen-bonded R(26) dimers
aSchool of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland, bDepartment of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB24 3UE, Scotland, and cInstituto de Química, Departamento de Química Inorgânica, Universidade Federal do Rio de Janeiro, 21945-970 Rio de Janeiro, RJ, Brazil
*Correspondence e-mail: cg@st-andrews.ac.uk
In the title compound {alternative name: N′-(4-nitrobenzylidene)-N,N-bis[2-(4-nitrobenzylideneamino)ethyl]-1,2-ethanediamine}, C27H27N7O6, the three independent NCH2CH2N=CHC6H4NO2 fragments all exhibit different conformations, resulting from the different direction-specific intra- and intermolecular interactions experienced. The molecules are linked by a single C—H⋯O hydrogen bond into centrosymmetric (26) dimers, which are linked by π–π stacking interactions into [111] chains and, more weakly, into (01) sheets.
Comment
In a continuation of our studies on the molecular and supramolecular structures in nitrophenylimines, we now report our findings on the title compound, (I). In the molecules of (I), the three crystallographically independent NCH2CH2N=CHC6H4NO2 fragments all adopt different conformations, as shown by the leading torsion angles (Table 1). In particular, the N10—Cn9 and Cn8—Nn7 bonds (n = 1–3) are antiperiplanar when n = 1, but synclinal when n = 2 and n = 3, while the Cn9—Cn8 and Nn7—Cn7 bonds are anticlinal when n = 1 and n = 2, but when n = 3. In addition, the dihedral angles between the Cn1–Cn6 aryl rings and the corresponding nitro groups are 15.5 (2), 7.8 (2) and 0.8 (2)° for n = 1–3, respectively.
The central atom, N10, has a pyramidal configuration (Table 1 and Fig. 1), as expected, and there is a single intramolecular C—H⋯N hydrogen bond (Table 2), with amine atom C37 as a donor and atom N10 as an acceptor in an S(6) motif (Bernstein et al., 1995); this interaction probably has a significant influence on the conformation of the N10/C39/C38/N37/C37 fragment. In addition, the C21–C26 and C31–C36 aryl rings within the molecule make a dihedral angle of only 2.0 (2)°; the is ca 3.64 Å and the ring-centroid separation is 3.931 (2) Å, corresponding to a ring offset of ca 1.48 Å. Despite the fairly large this weak intramolecular interaction may have some influence on the overall conformation.
The molecules of (I) are linked weakly into centrosymmetric dimers by a single C—H⋯O hydrogen bond (Table 2) and a single π–π stacking interaction links these dimers into a chain. Methylene atom C29 in the molecule at (x, y, z) acts as a hydrogen-bond donor, via atom H29B, to nitro atom O32 in the molecule at (1 − x, 1 − y, 1 − z), so forming a centrosymmetric (26) ring centred at (, , ) (Fig. 2). The C11–C16 aryl rings in the molecules at (x, y, z) and (−x, −y, −z) are strictly parallel, with an of 3.428 (2)°; the ring-centroid separation is 3.549 (2) Å, corresponding to a ring offset of 0.919 (2) Å. Propagation by inversion of these two interactions then generates a chain running parallel to the [111] direction (Fig. 2).
Just one chain passes through each π–π stacking interaction, this time intermolecular, between the C21–C26 and C31–C36 rings in the molecules at (x, y, z) and (1 x, y, z). Again, the dihedral angle between the rings is only 2.0 (2)°, with an now of ca 3.46 Å; the ring-centroid separation is 3.924 (2) Å, corresponding to a ring offset of ca 1.85 Å, so this interaction is possibly weaker than the intramolecular stacking interaction. The effect of this interaction is to link [111] chains into (01) sheets.
the only possible direction-specific interaction between adjacent chains is a secondThus, the three independent NCH2CH2N=CHC6H4NO2 fragments all participate in a different range of direction-specific non-covalent interactions. When n = 1, the aryl rings are involved in intermolecular π–π stacking, when n = 3, there is an intramolecular C—H⋯N hydrogen bond, while the two fragments with n = 2 and 3 participate not only in intermolecular C—H⋯O hydrogen bonding but also in both intra- and intermolecular stacking interactions. Accordingly, it would not be expected that these three limbs of the molecule should adopt similar conformations.
Experimental
A solution of 4-nitrobenzaldehyde (0.9 g, 6 mmol) and tris(2-aminoethyl)amine (0.29 g, 2 mmol) in methanol (25 ml) was heated under reflux for 2 h. The solution was filtered hot, the filtrate was evaporated and the solid residue was recrystallized from ethanol to yield compound (I) (m.p. 416–418 K; darkens at 410–411 K). IR: 1642, 1602, 1517, 1346 cm−1. Crystals suitable for single-crystal X-ray diffraction were grown by slow evaporation of a solution in 1,2-dichloroethane.
Crystal data
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Refinement
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Crystals of compound (I) are triclinic; was selected and confirmed by the successful structure analysis. All H atoms were located from difference maps and subsequently treated as riding atoms, with C—H distances of 0.95 (aromatic and aliphatic CH) or 0.99 Å (CH2) and Uiso(H) values of 1.2Ueq(C).
Data collection: COLLECT (Hooft, 1999); cell DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO and COLLECT; program(s) used to solve structure: OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: OSCAIL and SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97 and PRPKAPPA (Ferguson, 1999).
Supporting information
10.1107/S0108270104033141/sk1801sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S0108270104033141/sk1801Isup2.hkl
A solution of 4-nitrobenzaldehyde (0.9 g, 6 mmol) and tris(2-aminoethyl)amine, N(CH2CH2NH2)3 (0.29 g, 2 mmol), in methanol (25 ml) was heated under reflux for 2 h; the solution was filtered hot, the filtrate was evaporated and the solid residue was recrystallized from ethanol to yield compound (I) (m.p. 416–418 K; darkens at 410–411 K). IR: 1642, 1602, 1517, 1346 cm−1. Crystals suitable for single-crystal X-ray diffraction were grown by slow evaporation of a solution in 1,2-dichloroethane.
Crystal of compound (I) are triclinic:
P-1 was selected, and confirmed by the successful structure analysis. All H atoms were located from difference maps and subsequently treated as riding atoms, with C—H distances of 0.95 Å (aromatic and aliphatic CH) or 0.99 Å (CH2), and with Uiso(H) values of 1.2Ueq(C).Data collection: COLLECT (Hooft, 1999); cell
DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO and COLLECT; program(s) used to solve structure: OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: OSCAIL and SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003); software used to prepare material for publication: SHELXL97 and PRPKAPPA (Ferguson, 1999).C27H27N7O6 | Z = 2 |
Mr = 545.56 | F(000) = 572 |
Triclinic, P1 | Dx = 1.408 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.8020 (2) Å | Cell parameters from 5891 reflections |
b = 12.5233 (5) Å | θ = 3.1–27.6° |
c = 13.8920 (6) Å | µ = 0.10 mm−1 |
α = 83.5872 (18)° | T = 120 K |
β = 89.022 (2)° | Plate, orange |
γ = 72.611 (2)° | 0.20 × 0.09 × 0.04 mm |
V = 1287.01 (8) Å3 |
Nonius KappaCCD diffractometer | 5891 independent reflections |
Radiation source: Bruker-Nonius FR91 rotating anode | 3714 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.08 |
Detector resolution: 9.091 pixels mm-1 | θmax = 27.6°, θmin = 3.1° |
ϕ and ω scans | h = −10→9 |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | k = −16→16 |
Tmin = 0.977, Tmax = 0.996 | l = −18→17 |
26427 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.051 | H-atom parameters constrained |
wR(F2) = 0.124 | w = 1/[σ2(Fo2) + (0.0568P)2 + 0.0732P] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max < 0.001 |
5891 reflections | Δρmax = 0.24 e Å−3 |
362 parameters | Δρmin = −0.22 e Å−3 |
0 restraints | Extinction correction: SHELXL97, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0089 (18) |
C27H27N7O6 | γ = 72.611 (2)° |
Mr = 545.56 | V = 1287.01 (8) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.8020 (2) Å | Mo Kα radiation |
b = 12.5233 (5) Å | µ = 0.10 mm−1 |
c = 13.8920 (6) Å | T = 120 K |
α = 83.5872 (18)° | 0.20 × 0.09 × 0.04 mm |
β = 89.022 (2)° |
Nonius KappaCCD diffractometer | 5891 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2003) | 3714 reflections with I > 2σ(I) |
Tmin = 0.977, Tmax = 0.996 | Rint = 0.08 |
26427 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 0 restraints |
wR(F2) = 0.124 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.24 e Å−3 |
5891 reflections | Δρmin = −0.22 e Å−3 |
362 parameters |
x | y | z | Uiso*/Ueq | ||
O11 | 0.14641 (17) | −0.28778 (11) | −0.07882 (10) | 0.0457 (4) | |
O12 | 0.0595 (2) | −0.16591 (12) | −0.20336 (10) | 0.0566 (4) | |
O21 | 0.4627 (2) | 0.01656 (13) | 0.66805 (11) | 0.0645 (5) | |
O22 | 0.4846 (2) | 0.16844 (13) | 0.71936 (11) | 0.0613 (4) | |
O31 | 0.9532 (3) | 0.04366 (12) | 0.64009 (12) | 0.0740 (5) | |
O32 | 0.94378 (19) | 0.19154 (12) | 0.70732 (10) | 0.0523 (4) | |
N10 | 0.24909 (16) | 0.49233 (11) | 0.14451 (9) | 0.0232 (3) | |
N14 | 0.12691 (18) | −0.19402 (13) | −0.12215 (11) | 0.0315 (4) | |
N17 | 0.32739 (17) | 0.22701 (12) | 0.02761 (11) | 0.0292 (3) | |
N24 | 0.4352 (2) | 0.11912 (15) | 0.65962 (12) | 0.0431 (4) | |
N27 | 0.02316 (17) | 0.48288 (12) | 0.30892 (10) | 0.0280 (3) | |
N34 | 0.9099 (2) | 0.14538 (13) | 0.64024 (12) | 0.0406 (4) | |
N37 | 0.53931 (17) | 0.52233 (12) | 0.29041 (10) | 0.0287 (3) | |
C11 | 0.27778 (19) | 0.04781 (14) | 0.01678 (12) | 0.0250 (4) | |
C12 | 0.2630 (2) | −0.05033 (14) | 0.06968 (13) | 0.0289 (4) | |
C13 | 0.2153 (2) | −0.13072 (14) | 0.02430 (13) | 0.0287 (4) | |
C14 | 0.18322 (19) | −0.11124 (13) | −0.07416 (12) | 0.0252 (4) | |
C15 | 0.1988 (2) | −0.01525 (14) | −0.12921 (13) | 0.0297 (4) | |
C16 | 0.2472 (2) | 0.06392 (14) | −0.08307 (12) | 0.0271 (4) | |
C17 | 0.32195 (19) | 0.13281 (14) | 0.06855 (13) | 0.0281 (4) | |
C18 | 0.3686 (2) | 0.30337 (14) | 0.08880 (13) | 0.0306 (4) | |
C19 | 0.2282 (2) | 0.41863 (14) | 0.07335 (12) | 0.0258 (4) | |
C21 | 0.1542 (2) | 0.30965 (15) | 0.40992 (12) | 0.0281 (4) | |
C22 | 0.2066 (2) | 0.19299 (15) | 0.41728 (14) | 0.0358 (4) | |
C23 | 0.2970 (2) | 0.12981 (16) | 0.49947 (14) | 0.0383 (5) | |
C24 | 0.3352 (2) | 0.18580 (15) | 0.57335 (13) | 0.0325 (4) | |
C25 | 0.2852 (2) | 0.30187 (15) | 0.56829 (13) | 0.0313 (4) | |
C26 | 0.1927 (2) | 0.36310 (15) | 0.48608 (13) | 0.0308 (4) | |
C27 | 0.0610 (2) | 0.37721 (16) | 0.32134 (13) | 0.0295 (4) | |
C28 | −0.0562 (2) | 0.53831 (15) | 0.21550 (12) | 0.0286 (4) | |
C29 | 0.0810 (2) | 0.58175 (14) | 0.15663 (12) | 0.0256 (4) | |
C31 | 0.6448 (2) | 0.34655 (14) | 0.39083 (12) | 0.0264 (4) | |
C32 | 0.6897 (2) | 0.23063 (15) | 0.39648 (13) | 0.0343 (4) | |
C33 | 0.7773 (2) | 0.16399 (15) | 0.47776 (14) | 0.0368 (5) | |
C34 | 0.8142 (2) | 0.21619 (14) | 0.55403 (12) | 0.0293 (4) | |
C35 | 0.7699 (2) | 0.33155 (14) | 0.55189 (12) | 0.0287 (4) | |
C36 | 0.6846 (2) | 0.39620 (14) | 0.46897 (12) | 0.0281 (4) | |
C37 | 0.5584 (2) | 0.41843 (15) | 0.30179 (13) | 0.0298 (4) | |
C38 | 0.4579 (2) | 0.59222 (14) | 0.20125 (12) | 0.0276 (4) | |
C39 | 0.3992 (2) | 0.53747 (14) | 0.12041 (12) | 0.0254 (4) | |
H12 | 0.2858 | −0.0623 | 0.1376 | 0.035* | |
H13 | 0.2051 | −0.1976 | 0.0603 | 0.034* | |
H15 | 0.1767 | −0.0042 | −0.1972 | 0.036* | |
H16 | 0.2597 | 0.1298 | −0.1197 | 0.033* | |
H17 | 0.3476 | 0.1160 | 0.1361 | 0.034* | |
H18A | 0.4889 | 0.3110 | 0.0731 | 0.037* | |
H18B | 0.3707 | 0.2722 | 0.1576 | 0.037* | |
H19A | 0.2394 | 0.4544 | 0.0073 | 0.031* | |
H19B | 0.1068 | 0.4092 | 0.0786 | 0.031* | |
H22 | 0.1803 | 0.1562 | 0.3657 | 0.043* | |
H23 | 0.3321 | 0.0499 | 0.5052 | 0.046* | |
H25 | 0.3133 | 0.3384 | 0.6195 | 0.038* | |
H26 | 0.1547 | 0.4430 | 0.4814 | 0.037* | |
H27 | 0.0285 | 0.3396 | 0.2721 | 0.035* | |
H28A | −0.1641 | 0.6019 | 0.2253 | 0.034* | |
H28B | −0.0935 | 0.4844 | 0.1800 | 0.034* | |
H29A | 0.0284 | 0.6160 | 0.0920 | 0.031* | |
H29B | 0.1079 | 0.6413 | 0.1895 | 0.031* | |
H32 | 0.6601 | 0.1963 | 0.3441 | 0.041* | |
H33 | 0.8112 | 0.0842 | 0.4811 | 0.044* | |
H35 | 0.7968 | 0.3655 | 0.6052 | 0.034* | |
H36 | 0.6526 | 0.4760 | 0.4654 | 0.034* | |
H37 | 0.5168 | 0.3851 | 0.2524 | 0.036* | |
H38A | 0.5448 | 0.6304 | 0.1736 | 0.033* | |
H38B | 0.3512 | 0.6516 | 0.2200 | 0.033* | |
H39A | 0.3647 | 0.5939 | 0.0628 | 0.030* | |
H39B | 0.5031 | 0.4755 | 0.1027 | 0.030* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O11 | 0.0569 (8) | 0.0305 (8) | 0.0545 (9) | −0.0217 (6) | −0.0144 (7) | 0.0013 (7) |
O12 | 0.0938 (11) | 0.0473 (9) | 0.0373 (9) | −0.0338 (8) | −0.0228 (8) | −0.0015 (7) |
O21 | 0.0938 (12) | 0.0396 (10) | 0.0474 (10) | −0.0045 (8) | −0.0058 (8) | 0.0057 (8) |
O22 | 0.0872 (11) | 0.0605 (11) | 0.0376 (9) | −0.0264 (9) | −0.0234 (8) | 0.0038 (8) |
O31 | 0.1299 (15) | 0.0261 (9) | 0.0518 (10) | −0.0025 (9) | −0.0255 (10) | 0.0012 (7) |
O32 | 0.0745 (10) | 0.0410 (9) | 0.0342 (8) | −0.0051 (7) | −0.0184 (7) | −0.0049 (7) |
N10 | 0.0214 (6) | 0.0257 (8) | 0.0238 (8) | −0.0073 (6) | −0.0023 (5) | −0.0060 (6) |
N14 | 0.0320 (8) | 0.0295 (9) | 0.0342 (9) | −0.0105 (6) | −0.0042 (7) | −0.0046 (7) |
N17 | 0.0288 (7) | 0.0265 (8) | 0.0334 (9) | −0.0077 (6) | −0.0018 (6) | −0.0089 (7) |
N24 | 0.0514 (10) | 0.0411 (11) | 0.0333 (10) | −0.0107 (8) | 0.0014 (8) | 0.0017 (8) |
N27 | 0.0262 (7) | 0.0343 (9) | 0.0256 (8) | −0.0111 (6) | 0.0021 (6) | −0.0062 (7) |
N34 | 0.0530 (10) | 0.0289 (10) | 0.0329 (10) | −0.0029 (7) | −0.0038 (8) | 0.0004 (8) |
N37 | 0.0272 (7) | 0.0300 (9) | 0.0280 (8) | −0.0070 (6) | −0.0024 (6) | −0.0030 (7) |
C11 | 0.0182 (8) | 0.0269 (10) | 0.0293 (10) | −0.0048 (7) | −0.0015 (7) | −0.0060 (8) |
C12 | 0.0295 (9) | 0.0317 (10) | 0.0232 (9) | −0.0058 (7) | −0.0037 (7) | −0.0025 (8) |
C13 | 0.0288 (9) | 0.0237 (9) | 0.0326 (10) | −0.0074 (7) | −0.0018 (7) | 0.0005 (8) |
C14 | 0.0206 (8) | 0.0231 (9) | 0.0312 (10) | −0.0049 (7) | −0.0037 (7) | −0.0047 (8) |
C15 | 0.0328 (9) | 0.0319 (10) | 0.0244 (10) | −0.0091 (8) | −0.0024 (7) | −0.0040 (8) |
C16 | 0.0278 (8) | 0.0250 (9) | 0.0290 (10) | −0.0089 (7) | 0.0000 (7) | −0.0022 (8) |
C17 | 0.0215 (8) | 0.0317 (11) | 0.0291 (10) | −0.0039 (7) | −0.0018 (7) | −0.0063 (8) |
C18 | 0.0304 (9) | 0.0290 (10) | 0.0338 (11) | −0.0091 (7) | −0.0046 (7) | −0.0084 (8) |
C19 | 0.0258 (8) | 0.0302 (10) | 0.0223 (9) | −0.0088 (7) | −0.0038 (7) | −0.0056 (7) |
C21 | 0.0259 (8) | 0.0347 (10) | 0.0270 (10) | −0.0129 (7) | 0.0033 (7) | −0.0075 (8) |
C22 | 0.0424 (10) | 0.0354 (11) | 0.0346 (11) | −0.0161 (8) | −0.0016 (8) | −0.0123 (9) |
C23 | 0.0467 (11) | 0.0293 (11) | 0.0412 (12) | −0.0148 (9) | 0.0002 (9) | −0.0038 (9) |
C24 | 0.0368 (10) | 0.0343 (11) | 0.0265 (10) | −0.0118 (8) | 0.0015 (8) | −0.0008 (8) |
C25 | 0.0344 (9) | 0.0363 (11) | 0.0262 (10) | −0.0132 (8) | 0.0000 (7) | −0.0087 (8) |
C26 | 0.0346 (9) | 0.0287 (10) | 0.0315 (10) | −0.0118 (8) | 0.0007 (8) | −0.0068 (8) |
C27 | 0.0257 (8) | 0.0403 (12) | 0.0280 (10) | −0.0160 (8) | 0.0004 (7) | −0.0100 (9) |
C28 | 0.0238 (8) | 0.0375 (10) | 0.0250 (10) | −0.0088 (7) | −0.0023 (7) | −0.0060 (8) |
C29 | 0.0241 (8) | 0.0269 (9) | 0.0246 (9) | −0.0051 (7) | −0.0031 (7) | −0.0041 (7) |
C31 | 0.0243 (8) | 0.0302 (10) | 0.0269 (10) | −0.0113 (7) | −0.0012 (7) | −0.0036 (8) |
C32 | 0.0425 (10) | 0.0322 (11) | 0.0324 (11) | −0.0152 (8) | −0.0027 (8) | −0.0098 (9) |
C33 | 0.0474 (11) | 0.0250 (10) | 0.0385 (12) | −0.0109 (8) | −0.0013 (9) | −0.0049 (9) |
C34 | 0.0333 (9) | 0.0261 (10) | 0.0268 (10) | −0.0071 (7) | −0.0008 (7) | −0.0011 (8) |
C35 | 0.0289 (9) | 0.0310 (10) | 0.0261 (10) | −0.0077 (7) | −0.0020 (7) | −0.0056 (8) |
C36 | 0.0268 (8) | 0.0246 (9) | 0.0332 (10) | −0.0073 (7) | 0.0001 (7) | −0.0053 (8) |
C37 | 0.0300 (9) | 0.0343 (11) | 0.0285 (10) | −0.0127 (8) | −0.0047 (7) | −0.0080 (8) |
C38 | 0.0252 (8) | 0.0296 (10) | 0.0287 (10) | −0.0093 (7) | −0.0034 (7) | −0.0029 (8) |
C39 | 0.0232 (8) | 0.0284 (9) | 0.0248 (9) | −0.0083 (7) | −0.0009 (7) | −0.0027 (7) |
N10—C39 | 1.4641 (19) | C29—H29B | 0.99 |
N10—C19 | 1.468 (2) | C22—C23 | 1.385 (3) |
N10—C29 | 1.4693 (19) | C22—H22 | 0.95 |
C11—C16 | 1.393 (2) | C23—C24 | 1.389 (3) |
C11—C12 | 1.394 (2) | C23—H23 | 0.95 |
C11—C17 | 1.472 (2) | C24—C25 | 1.382 (2) |
C17—N17 | 1.263 (2) | C24—N24 | 1.470 (2) |
C17—H17 | 0.95 | N24—O22 | 1.219 (2) |
N17—C18 | 1.454 (2) | N24—O21 | 1.230 (2) |
C18—C19 | 1.524 (2) | C25—C26 | 1.384 (2) |
C18—H18A | 0.99 | C25—H25 | 0.95 |
C18—H18B | 0.99 | C26—H26 | 0.95 |
C19—H19A | 0.99 | C31—C32 | 1.381 (2) |
C19—H19B | 0.99 | C31—C36 | 1.393 (2) |
C12—C13 | 1.387 (2) | C31—C37 | 1.487 (2) |
C12—H12 | 0.95 | C37—N37 | 1.257 (2) |
C13—C14 | 1.376 (2) | C37—H37 | 0.95 |
C13—H13 | 0.95 | N37—C38 | 1.468 (2) |
C14—C15 | 1.387 (2) | C38—C39 | 1.522 (2) |
C14—N14 | 1.466 (2) | C38—H38A | 0.99 |
N14—O12 | 1.2223 (19) | C38—H38B | 0.99 |
N14—O11 | 1.2260 (19) | C39—H39A | 0.99 |
C15—C16 | 1.382 (2) | C39—H39B | 0.99 |
C15—H15 | 0.95 | C32—C33 | 1.383 (3) |
C16—H16 | 0.95 | C32—H32 | 0.95 |
C21—C22 | 1.387 (2) | C33—C34 | 1.382 (2) |
C21—C26 | 1.395 (2) | C33—H33 | 0.95 |
C21—C27 | 1.480 (2) | C34—C35 | 1.378 (2) |
C27—N27 | 1.259 (2) | C34—N34 | 1.475 (2) |
C27—H27 | 0.95 | N34—O31 | 1.217 (2) |
N27—C28 | 1.456 (2) | N34—O32 | 1.2218 (19) |
C28—C29 | 1.527 (2) | C35—C36 | 1.386 (2) |
C28—H28A | 0.99 | C35—H35 | 0.95 |
C28—H28B | 0.99 | C36—H36 | 0.95 |
C29—H29A | 0.99 | ||
C19—N10—C29 | 111.74 (11) | C28—C29—H29B | 109.1 |
C29—N10—C39 | 112.10 (12) | H29A—C29—H29B | 107.8 |
C39—N10—C19 | 111.24 (12) | C23—C22—C21 | 120.32 (17) |
C16—C11—C12 | 119.36 (15) | C23—C22—H22 | 119.8 |
C16—C11—C17 | 121.76 (15) | C21—C22—H22 | 119.8 |
C12—C11—C17 | 118.87 (15) | C22—C23—C24 | 118.61 (17) |
N17—C17—C11 | 123.28 (16) | C22—C23—H23 | 120.7 |
N17—C17—H17 | 118.4 | C24—C23—H23 | 120.7 |
C11—C17—H17 | 118.4 | C25—C24—C23 | 122.53 (17) |
C17—N17—C18 | 116.94 (15) | C25—C24—N24 | 118.66 (16) |
N17—C18—C19 | 110.28 (13) | C23—C24—N24 | 118.80 (17) |
N17—C18—H18A | 109.6 | O22—N24—O21 | 123.57 (17) |
C19—C18—H18A | 109.6 | O22—N24—C24 | 118.36 (17) |
N17—C18—H18B | 109.6 | O21—N24—C24 | 118.06 (17) |
C19—C18—H18B | 109.6 | C24—C25—C26 | 117.77 (16) |
H18A—C18—H18B | 108.1 | C24—C25—H25 | 121.1 |
N10—C19—C18 | 111.72 (12) | C26—C25—H25 | 121.1 |
N10—C19—H19A | 109.3 | C25—C26—C21 | 121.23 (17) |
C18—C19—H19A | 109.3 | C25—C26—H26 | 119.4 |
N10—C19—H19B | 109.3 | C21—C26—H26 | 119.4 |
C18—C19—H19B | 109.3 | C32—C31—C36 | 119.32 (16) |
H19A—C19—H19B | 107.9 | C32—C31—C37 | 120.85 (15) |
C13—C12—C11 | 120.76 (16) | C36—C31—C37 | 119.82 (15) |
C13—C12—H12 | 119.6 | N37—C37—C31 | 121.42 (15) |
C11—C12—H12 | 119.6 | N37—C37—H37 | 119.3 |
C14—C13—C12 | 118.35 (16) | C31—C37—H37 | 119.3 |
C14—C13—H13 | 120.8 | C37—N37—C38 | 121.08 (15) |
C12—C13—H13 | 120.8 | N37—C38—C39 | 119.45 (14) |
C13—C14—C15 | 122.44 (15) | N37—C38—H38A | 107.5 |
C13—C14—N14 | 118.67 (15) | C39—C38—H38A | 107.5 |
C15—C14—N14 | 118.88 (15) | N37—C38—H38B | 107.5 |
O12—N14—O11 | 122.66 (15) | C39—C38—H38B | 107.5 |
O12—N14—C14 | 118.46 (15) | H38A—C38—H38B | 107.0 |
O11—N14—C14 | 118.87 (14) | N10—C39—C38 | 114.66 (13) |
C16—C15—C14 | 118.58 (16) | N10—C39—H39A | 108.6 |
C16—C15—H15 | 120.7 | C38—C39—H39A | 108.6 |
C14—C15—H15 | 120.7 | N10—C39—H39B | 108.6 |
C15—C16—C11 | 120.51 (16) | C38—C39—H39B | 108.6 |
C15—C16—H16 | 119.7 | H39A—C39—H39B | 107.6 |
C11—C16—H16 | 119.7 | C31—C32—C33 | 120.61 (16) |
C22—C21—C26 | 119.53 (16) | C31—C32—H32 | 119.7 |
C22—C21—C27 | 120.37 (16) | C33—C32—H32 | 119.7 |
C26—C21—C27 | 120.09 (16) | C34—C33—C32 | 118.45 (17) |
N27—C27—C21 | 122.25 (16) | C34—C33—H33 | 120.8 |
N27—C27—H27 | 118.9 | C32—C33—H33 | 120.8 |
C21—C27—H27 | 118.9 | C35—C34—C33 | 122.82 (16) |
C27—N27—C28 | 116.65 (15) | C35—C34—N34 | 118.57 (15) |
N27—C28—C29 | 109.44 (12) | C33—C34—N34 | 118.59 (16) |
N27—C28—H28A | 109.8 | O31—N34—O32 | 123.41 (16) |
C29—C28—H28A | 109.8 | O31—N34—C34 | 118.00 (16) |
N27—C28—H28B | 109.8 | O32—N34—C34 | 118.58 (15) |
C29—C28—H28B | 109.8 | C34—C35—C36 | 117.48 (16) |
H28A—C28—H28B | 108.2 | C34—C35—H35 | 121.3 |
N10—C29—C28 | 112.50 (13) | C36—C35—H35 | 121.3 |
N10—C29—H29A | 109.1 | C35—C36—C31 | 121.29 (16) |
C28—C29—H29A | 109.1 | C35—C36—H36 | 119.4 |
N10—C29—H29B | 109.1 | C31—C36—H36 | 119.4 |
C19—N10—C29—C28 | 74.96 (17) | C17—C11—C16—C15 | −177.36 (14) |
C29—N10—C39—C38 | 67.46 (17) | C26—C21—C27—N27 | 4.3 (2) |
C39—N10—C19—C18 | 76.85 (17) | C39—N10—C29—C28 | −159.38 (13) |
N10—C19—C18—N17 | 171.04 (13) | C26—C21—C22—C23 | −0.2 (3) |
N10—C29—C28—N27 | 55.99 (18) | C27—C21—C22—C23 | 178.72 (15) |
N10—C39—C38—N37 | 66.70 (19) | C21—C22—C23—C24 | −0.6 (3) |
C19—C18—N17—C17 | −128.34 (16) | C22—C23—C24—C25 | 0.6 (3) |
C29—C28—N27—C27 | −108.10 (16) | C22—C23—C24—N24 | −178.47 (16) |
C39—C38—N37—C37 | −1.3 (2) | C25—C24—N24—O22 | −6.7 (2) |
C18—N17—C17—C11 | 178.49 (13) | C23—C24—N24—O22 | 172.43 (17) |
C28—N27—C27—C21 | 175.43 (14) | C25—C24—N24—O21 | 172.54 (17) |
C38—N37—C37—C31 | 178.49 (14) | C23—C24—C25—C26 | 0.3 (3) |
N17—C17—C11—C12 | −175.56 (15) | N24—C24—C25—C26 | 179.39 (15) |
N27—C27—C21—C22 | −174.65 (16) | C24—C25—C26—C21 | −1.2 (2) |
N37—C37—C31—C32 | −170.11 (16) | C22—C21—C26—C25 | 1.2 (2) |
C13—C14—N14—O11 | −15.3 (2) | C27—C21—C26—C25 | −177.76 (15) |
C23—C24—N24—O21 | −8.4 (3) | C36—C31—C37—N37 | 8.6 (2) |
C33—C34—N34—O31 | 0.4 (3) | C19—N10—C39—C38 | −166.61 (13) |
C16—C11—C17—N17 | 3.2 (2) | C36—C31—C32—C33 | −1.6 (3) |
C29—N10—C19—C18 | −157.03 (13) | C37—C31—C32—C33 | 177.08 (16) |
C16—C11—C12—C13 | −1.1 (2) | C31—C32—C33—C34 | 1.8 (3) |
C17—C11—C12—C13 | 177.68 (14) | C32—C33—C34—C35 | −1.0 (3) |
C11—C12—C13—C14 | 0.1 (2) | C32—C33—C34—N34 | −179.14 (16) |
C12—C13—C14—C15 | 0.7 (2) | C35—C34—N34—O31 | −177.79 (18) |
C12—C13—C14—N14 | −177.98 (13) | C35—C34—N34—O32 | 1.2 (2) |
C13—C14—N14—O12 | 163.48 (16) | C33—C34—N34—O32 | 179.42 (17) |
C15—C14—N14—O12 | −15.3 (2) | C33—C34—C35—C36 | 0.1 (3) |
C15—C14—N14—O11 | 165.92 (15) | N34—C34—C35—C36 | 178.22 (15) |
C13—C14—C15—C16 | −0.5 (2) | C34—C35—C36—C31 | 0.1 (2) |
N14—C14—C15—C16 | 178.25 (14) | C32—C31—C36—C35 | 0.6 (2) |
C14—C15—C16—C11 | −0.6 (2) | C37—C31—C36—C35 | −178.05 (15) |
C12—C11—C16—C15 | 1.4 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
C29—H29B···O32i | 0.99 | 2.60 | 3.540 (2) | 159 |
C37—H37···N10 | 0.95 | 2.53 | 3.138 (2) | 122 |
Symmetry code: (i) −x+1, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C27H27N7O6 |
Mr | 545.56 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 120 |
a, b, c (Å) | 7.8020 (2), 12.5233 (5), 13.8920 (6) |
α, β, γ (°) | 83.5872 (18), 89.022 (2), 72.611 (2) |
V (Å3) | 1287.01 (8) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.20 × 0.09 × 0.04 |
Data collection | |
Diffractometer | Nonius KappaCCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2003) |
Tmin, Tmax | 0.977, 0.996 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 26427, 5891, 3714 |
Rint | 0.08 |
(sin θ/λ)max (Å−1) | 0.651 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.124, 1.04 |
No. of reflections | 5891 |
No. of parameters | 362 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.24, −0.22 |
Computer programs: COLLECT (Hooft, 1999), DENZO (Otwinowski & Minor, 1997) and COLLECT, DENZO and COLLECT, OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997), OSCAIL and SHELXL97 (Sheldrick, 1997), PLATON (Spek, 2003), SHELXL97 and PRPKAPPA (Ferguson, 1999).
C19—N10—C29 | 111.74 (11) | C39—N10—C19 | 111.24 (12) |
C29—N10—C39 | 112.10 (12) | ||
C19—N10—C29—C28 | 74.96 (17) | C18—N17—C17—C11 | 178.49 (13) |
C29—N10—C39—C38 | 67.46 (17) | C28—N27—C27—C21 | 175.43 (14) |
C39—N10—C19—C18 | 76.85 (17) | C38—N37—C37—C31 | 178.49 (14) |
N10—C19—C18—N17 | 171.04 (13) | N17—C17—C11—C12 | −175.56 (15) |
N10—C29—C28—N27 | 55.99 (18) | N27—C27—C21—C22 | −174.65 (16) |
N10—C39—C38—N37 | 66.70 (19) | N37—C37—C31—C32 | −170.11 (16) |
C19—C18—N17—C17 | −128.34 (16) | C13—C14—N14—O11 | −15.3 (2) |
C29—C28—N27—C27 | −108.10 (16) | C23—C24—N24—O21 | −8.4 (3) |
C39—C38—N37—C37 | −1.3 (2) | C33—C34—N34—O31 | 0.4 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C29—H29B···O32i | 0.99 | 2.60 | 3.540 (2) | 159 |
C37—H37···N10 | 0.95 | 2.53 | 3.138 (2) | 122 |
Symmetry code: (i) −x+1, −y+1, −z+1. |
Acknowledgements
X-ray data were collected at the EPSRC X-ray Crystallographic Service, University of Southampton, England. The authors thank the staff for all their help and advice. JLW thanks CNPq and FAPERJ for financial support.
References
Bernstein, J., Davis, R. E., Shimoni, L. & Chang, N.-L. (1995). Angew. Chem. Int. Ed. Engl. 34, 1555–1573. CrossRef CAS Web of Science Google Scholar
Ferguson, G. (1999). PRPKAPPA. University of Guelph, Canada. Google Scholar
Hooft, R. W. W. (1999). COLLECT. Nonius BV, Delft, The Netherlands. Google Scholar
McArdle, P. (2003). OSCAIL for Windows. Version 10. Crystallography Centre, Chemistry Department, NUI Galway, Ireland. Google Scholar
Otwinowski, Z. & Minor, W. (1997). Methods in Enzymology, Vol. 276, Macromolecular Crystallography, Part A, edited by C. W. Carter Jr & R. M. Sweet, pp. 307–326. New York: Academic Press. Google Scholar
Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2003). SADABS. Version 2.10. University of Göttingen, Germany. Google Scholar
Spek, A. L. (2003). J. Appl. Cryst. 36, 7–13. Web of Science CrossRef CAS IUCr Journals Google Scholar
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In continuation of our studies on the molecular and supramolecular structures in nitrophenylimines, we now report our findings on the title compound, (I). In the molecules of (I), the three crystallographically independent NCH2CH2N=CHC6H4NO2 fragments all adopt different conformations, as shown by the leading torsion angles (Table 1). In particular, the N10—Cn9 and Cn8—Nn7 bonds (n = 1–3) are antiperiplanar when n = 1, but synclinal for both n = 2 and n = 3, while the Cn9—Cn8 and Nn7—Cn7 bonds are anticlinal when n = 1 and n = 2, but synperiplanar when n = 3. In addition, the dihedral angles between the Cn1–Cn6 aryl rings and the corresponding nitro groups are 15.5 (2), 7.8 (2) and 0.8 (2)° for n = 1–3, respectively.
The central atom, N10, has a pyramidal configuration (Table 1), as expected, and there is a single intramolecular C—H···N hydrogen bond (Table 2), with amine atom C37 as donor and atom N10 as acceptor in an S(6) motif (Bernstein et al., 1995); this interaction probably has a significant influence on the conformation of the N10/C39/C38/N37/C37 fragment. In addition, the C21–C26 and C31–C36 aryl rings within the molecule make a dihedral angle of only 2.0 (2)°; the interplanar spacing is ca 3.64 Å, and the ring-centroid separation is 3.931 (2) Å, corresponding to a ring offset of ca 1.48 Å. Despite the fairly large interplanar spacing, this weak intramolecular interaction may have some influence on the overall conformation.
The molecules of (I) are linked weakly into centrosymmetric dimers by a single C—H···O hydrogen bond (Table 2) and a single π–π stacking interaction links these dimers into a chain. Methylene atom C29 in the molecule at (x, y, z) acts as a hydrogen-bond donor, via atom H29B, to nitro atom O32 in the molecule at (1 − x, 1 − y, 1 − z), so forming a centrosymmetric R22(26) ring centred at (1/2, 1/2, 1/2) (Fig. 2). The C11–C16 aryl rings in the molecules at (x, y, z) and (-x, −y, −z) are strictly parallel, with an interplanar spacing of 3.428 (2)°; the ring-centroid separation is 3.549 (2) Å, corresponding to a ring offset of 0.919 (2) Å. Propagation by inversion of these two interactions then generates a chain running parallel to the [111] direction (Fig. 2).
Just one chain passes through each unit cell; the only possible direction-specific interaction between adjacent chains is a second π–π stacking interaction, this time intermolecular, between the C21–C26 and C31–C36 rings in the molecules at (x, y, z) and (1 ± x, y, z). Again the dihedral angle between the rings is only 2.0 (2)°, with an interplanar spacing now of ca 3.46 Å; the ring-centroid separation is 3.924 (2) Å, corresponding to a ring offset of ca 1.85 Å, so this interaction is possibly weaker than the intramolecular stacking interaction. The effect of this interaction is to link [111] chains into (01–1) sheets.
Thus the three independent NCH2CH2N=CHC6H4NO2 fragments all participate in a different range of direction-specific non-covalent interactions. When n = 1, the aryl rings are involved in intermolecular π···π stacking; when n = 3, there is an intramolecular C—H···N hydrogen bond, while the two fragments with n = 2 and 3 participate not only in intermolecular C—H···O hydrogen bonding but also in both intra- and intermolecular stacking interactions. Accordingly, it would not be expected that these three limbs of the molecule should adopt similar conformations.