organic compounds
2,2′-[1,5-Bis(4-aminophenyl)-1,5-dihydrobenzo[1,2-d;4,5-d′]diimidazole-2,6-diyl]diphenol
aDepartment of Chemistry, J.J. Strossmayer University, Osijek, Franje Kuhača 20, HR-31000 Osijek, Croatia, and bLaboratory of General and Inorganic Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10002 Zagreb, Croatia
*Correspondence e-mail: ablagus@kemija.unios.hr
The title molecule, C32H24N6O2, has a crystallographic inversion centre in the middle of the benzodiimidazole core. It exists as the enol–imine tautomeric form and exhibits a strong intramolecular O—H⋯N hydrogen bond. The dihedral angles between the planes of the 2-hydroxyphenyl and 4-aminophenyl substituents and the plane of the benzodiimidazole unit [12.69 (8) and 84.71 (8)°, respectively] differ significantly due to steric reasons. In the crystal, molecules are linked by C—H⋯π interactions, forming a two-dimensional network.
Related literature
Benzodiimidazole and its derivatives are capable of adopting various coordination modes as well as forming multiple hydrogen bonds, see: Aakeröy et al. (2001); Holman et al. (2001). For the structures of benzodiimidazole derivatives with aromatic substituents, see: Boydston et al. (2006, 2007); Lin et al. (2004). For their pharmacological applications, see: Ansari & Lal (2009); Demirayak et al. (2011); Schulz & Skibo (2000). For applications of benzodiimidazole derivatives as ligands in coordination chemistry, see: Jiang et al. (2008). Some of their metal complexes have the property of metal-to-ligand charge-transfer excited states, see: Wang et al. (2011); Ohno et al. (1992).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2003); cell CrysAlis RED (Oxford Diffraction, 2003); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999), PARST97 (Nardelli, 1995) and Mercury (Macrae et al., 2008).
Supporting information
https://doi.org/10.1107/S1600536811036737/kp2351sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811036737/kp2351Isup2.hkl
The title compound has been prepared as a part of an investigation of the synthesis and characterisation of Schiff base ligands and their metal complexes. The compound (I) was derived from 1,5-dihydrobenzo[1,2 - d;4,5-d']diimidazole in an attempt of template synthesis of copper(II) complexes with Schiff base ligand prepared from p-phenylenediamine and salycylaldehyde. It is known that metal Shiff base complexes have very low solubility and that it is hard to prepare appropriate single crystals for the X-ray structure analysis. For these reasons we examined the possibility of getting crystal suitable for X-ray analysis by slow synthesis reaction through liquid diffusion method. The expected compound was prepared in U-tube in such a way that one arm contained ethanolic metal-aldehydate solution (1 mmol of copper(II) chloride dihydrate and 2 mmol of salycilaldehyde) and the other one ethanolic diamine solution (2 mmol of p-phenylenediamine). Chloroform was in between two solutions. The resulting precipitate was orange plated crystals.
The position of hydrogen atoms bounded to N3 and O1 were located in the difference Fourier map and refined. Hydrogen atoms bounded to carbon were treated as riding atoms with C–H = 0.93 Å. Isotropic thermal parameters were set up as Uiso(H) = 1.2 Ueq.
Benzodiimidazole and its derivatives are capable of adopting various coordination modes as well as forming multiple hydrogen bonds, which may provide a tool in crystal-engineering design for assembling building blocks into multi-dimensional structures (Aakeröy et al., 2001; Holman et al., 2001; Lin et al., 2004; Boydston et al., 2006; Boydston et al., 2007; Jiang et al., 2008). These compounds as potential complexing agents have been extensively investigated in recent years and were found to have a broad scope for spin crossover and biological activity. Benzodiimidazole and its derivatives are potential antitumor agents as inhibitors (Schulz & Skibo, 2000; Ansari & Lal, 2009; Demirayak, et al., 2011) and some of their metal complexes have the property of metal-to-ligand charge-transfer excited states (Ohno et al.,1992; Wang et al., 2011).
In this paper we report the synthesis and solid state structure of a novel heterocyclic system, the compound (I) containing benzodiimidazole core as a central moiety. The imidazole rings of later are substituted with 2–OH– and 4–aminobenzyl. Molecule is centrosymmetric with imposed inversion centre and placed in 2(a) special position of the πi [3.514 Å (i): x, –y–1/2, z –1/2; π refers to the C1–C6 aromatic system centroid] linked molecules into a two-dimensional network. Surprisingly, primary N3 amino groups are not involved in significant intermolecular interactions. Nevertheless, weak attraction probably exists between primary amino group with C12-to-C17 aromatic ring at the distance slightly less than 3.5 Å (Fig. 2). Crystal packing is shown in Fig. 3.
P21/c. Molecular stereochemistry is defined by orientation of 2–OH– and 4–aminobenzyl substituent planes to the plane of benzodiimidazole (Fig. 1). Although 2-OH-benzyl is involved in forming of strong intramolecular O1–H···N2 hydrogen bond [O1-H···N2, 2.582 (2) Å] with benzodiimidazole moiety its plane deviates significantly from coplanarity with benzodiimidazole (interplanar angle 12.69°). Due to the spatial reasons the interplanar angle between the planes of 4–aminobenzyl and benzodiimidazole is 84.71°. A weak intermolecular hydrogen interactions C14–H14···Benzodiimidazole and its derivatives are capable of adopting various coordination modes as well as forming multiple hydrogen bonds, see: Aakeröy et al. (2001); Holman et al. (2001). For the structures of benzodiimidazole derivatives with aromatic substituents, see: Boydston et al. (2006, 2007); Lin et al. (2004). For their pharmacological applications, see: Ansari & Lal (2009); Demirayak et al. (2011); Schulz & Skibo (2000). For applications of benzodiimidazole derivatives as ligands in coordination chemistry, see: Jiang et al. (2008). Some of their metal complexes have the property of metal-to-ligand charge-transfer excited states, see: Wang et al. (2011); Ohno et al. (1992).
Data collection: CrysAlis CCD (Oxford Diffraction, 2003); cell
CrysAlis RED (Oxford Diffraction, 2003); data reduction: CrysAlis RED (Oxford Diffraction, 2003); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999), PARST97 (Nardelli, 1995) and Mercury (Macrae et al., 2008).C32H24N6O2 | F(000) = 548 |
Mr = 524.57 | Dx = 1.403 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71069 Å |
Hall symbol: -P 2ybc | Cell parameters from 2702 reflections |
a = 6.5181 (3) Å | θ = 4–27° |
b = 13.3206 (7) Å | µ = 0.09 mm−1 |
c = 14.3081 (7) Å | T = 298 K |
β = 91.680 (4)° | Prism, brown |
V = 1241.77 (11) Å3 | 0.3 × 0.1 × 0.1 mm |
Z = 2 |
Oxford Diffraction Xcalibur CCD diffractometer | 1605 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.052 |
Graphite monochromator | θmax = 27.0°, θmin = 3.7° |
ω scans | h = −8→8 |
15503 measured reflections | k = −16→17 |
2702 independent reflections | l = −18→18 |
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) = 0.123 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | w = 1/[σ2(Fo2) + (0.0516P)2 + 0.1714P] where P = (Fo2 + 2Fc2)/3 |
2702 reflections | (Δ/σ)max = 0.001 |
190 parameters | Δρmax = 0.17 e Å−3 |
0 restraints | Δρmin = −0.16 e Å−3 |
C32H24N6O2 | V = 1241.77 (11) Å3 |
Mr = 524.57 | Z = 2 |
Monoclinic, P21/c | Mo Kα radiation |
a = 6.5181 (3) Å | µ = 0.09 mm−1 |
b = 13.3206 (7) Å | T = 298 K |
c = 14.3081 (7) Å | 0.3 × 0.1 × 0.1 mm |
β = 91.680 (4)° |
Oxford Diffraction Xcalibur CCD diffractometer | 1605 reflections with I > 2σ(I) |
15503 measured reflections | Rint = 0.052 |
2702 independent reflections |
R[F2 > 2σ(F2)] = 0.053 | 0 restraints |
wR(F2) = 0.123 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | Δρmax = 0.17 e Å−3 |
2702 reflections | Δρmin = −0.16 e Å−3 |
190 parameters |
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 | ||
O1 | −0.6794 (3) | 0.55326 (12) | 0.29326 (12) | 0.0681 (5) | |
H1 | −0.549 (4) | 0.5627 (18) | 0.3187 (17) | 0.082* | |
N1 | −0.2776 (2) | 0.35831 (11) | 0.44335 (11) | 0.0445 (4) | |
N2 | −0.3419 (2) | 0.51109 (12) | 0.38381 (11) | 0.0482 (4) | |
N3 | −0.3167 (4) | −0.02530 (16) | 0.60297 (17) | 0.0715 (6) | |
H3A | −0.295 (4) | −0.077 (2) | 0.5640 (19) | 0.086* | |
H3B | −0.424 (4) | −0.0300 (19) | 0.6421 (19) | 0.086* | |
C1 | −0.7197 (3) | 0.45382 (16) | 0.29194 (14) | 0.0492 (5) | |
C2 | −0.5877 (3) | 0.38185 (15) | 0.33432 (13) | 0.0446 (5) | |
C3 | −0.6341 (3) | 0.28103 (16) | 0.31968 (15) | 0.0534 (6) | |
H3 | −0.5461 | 0.2325 | 0.3448 | 0.064* | |
C4 | −0.8066 (3) | 0.25088 (17) | 0.26907 (15) | 0.0593 (6) | |
H4 | −0.8327 | 0.1830 | 0.2593 | 0.071* | |
C5 | −0.9399 (3) | 0.32224 (19) | 0.23309 (16) | 0.0618 (6) | |
H5 | −1.0591 | 0.3024 | 0.2009 | 0.074* | |
C6 | −0.8976 (3) | 0.42242 (18) | 0.24457 (15) | 0.0582 (6) | |
H6 | −0.9891 | 0.4700 | 0.2203 | 0.070* | |
C7 | −0.4052 (3) | 0.41599 (15) | 0.38676 (13) | 0.0449 (5) | |
C9 | −0.1660 (3) | 0.51705 (14) | 0.44101 (13) | 0.0444 (5) | |
C10 | −0.1229 (3) | 0.42139 (14) | 0.47848 (14) | 0.0438 (5) | |
C11 | 0.0420 (3) | 0.40088 (14) | 0.53848 (14) | 0.0463 (5) | |
H11 | 0.0676 | 0.3373 | 0.5630 | 0.056* | |
C12 | −0.3013 (3) | 0.25779 (13) | 0.47880 (13) | 0.0410 (5) | |
C13 | −0.4253 (3) | 0.24106 (15) | 0.55365 (14) | 0.0481 (5) | |
H13 | −0.5027 | 0.2932 | 0.5777 | 0.058* | |
C14 | −0.4337 (3) | 0.14674 (16) | 0.59246 (15) | 0.0552 (6) | |
H14 | −0.5182 | 0.1358 | 0.6427 | 0.066* | |
C15 | −0.3202 (3) | 0.06807 (15) | 0.55872 (15) | 0.0502 (5) | |
C16 | −0.2049 (3) | 0.08554 (16) | 0.48043 (17) | 0.0604 (6) | |
H16 | −0.1349 | 0.0326 | 0.4535 | 0.072* | |
C17 | −0.1923 (3) | 0.17967 (16) | 0.44203 (16) | 0.0560 (6) | |
H17 | −0.1099 | 0.1906 | 0.3910 | 0.067* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0738 (11) | 0.0511 (10) | 0.0777 (12) | 0.0089 (8) | −0.0240 (9) | −0.0015 (8) |
N1 | 0.0454 (9) | 0.0404 (10) | 0.0473 (10) | −0.0055 (7) | −0.0058 (8) | 0.0064 (7) |
N2 | 0.0500 (10) | 0.0449 (11) | 0.0492 (10) | −0.0047 (8) | −0.0061 (8) | 0.0068 (8) |
N3 | 0.0841 (15) | 0.0528 (13) | 0.0764 (16) | −0.0128 (11) | −0.0182 (12) | 0.0168 (11) |
C1 | 0.0499 (12) | 0.0538 (14) | 0.0438 (12) | 0.0053 (10) | 0.0007 (10) | −0.0017 (10) |
C2 | 0.0428 (11) | 0.0497 (13) | 0.0414 (11) | −0.0026 (9) | 0.0003 (9) | 0.0031 (9) |
C3 | 0.0566 (13) | 0.0503 (13) | 0.0527 (13) | −0.0070 (10) | −0.0088 (10) | 0.0101 (10) |
C4 | 0.0654 (14) | 0.0585 (15) | 0.0534 (14) | −0.0162 (12) | −0.0074 (11) | 0.0032 (11) |
C5 | 0.0514 (13) | 0.0803 (18) | 0.0532 (14) | −0.0080 (12) | −0.0085 (11) | −0.0006 (12) |
C6 | 0.0496 (12) | 0.0732 (17) | 0.0513 (14) | 0.0106 (11) | −0.0057 (10) | −0.0036 (11) |
C7 | 0.0471 (11) | 0.0445 (13) | 0.0431 (12) | −0.0009 (9) | −0.0004 (9) | 0.0047 (9) |
C9 | 0.0456 (11) | 0.0450 (12) | 0.0424 (12) | −0.0014 (9) | −0.0015 (9) | 0.0056 (9) |
C10 | 0.0441 (11) | 0.0420 (12) | 0.0451 (12) | −0.0061 (9) | 0.0002 (9) | 0.0038 (9) |
C11 | 0.0508 (11) | 0.0381 (12) | 0.0495 (12) | −0.0032 (9) | −0.0038 (9) | 0.0102 (9) |
C12 | 0.0434 (10) | 0.0351 (11) | 0.0441 (12) | −0.0027 (8) | −0.0042 (9) | 0.0062 (9) |
C13 | 0.0573 (12) | 0.0428 (12) | 0.0444 (12) | −0.0050 (9) | 0.0048 (10) | −0.0067 (9) |
C14 | 0.0681 (14) | 0.0530 (14) | 0.0447 (13) | −0.0141 (11) | 0.0073 (11) | 0.0008 (10) |
C15 | 0.0524 (12) | 0.0429 (13) | 0.0544 (14) | −0.0091 (10) | −0.0129 (10) | 0.0077 (10) |
C16 | 0.0605 (13) | 0.0451 (13) | 0.0756 (17) | 0.0090 (11) | 0.0030 (12) | 0.0007 (11) |
C17 | 0.0539 (12) | 0.0515 (14) | 0.0634 (15) | 0.0031 (10) | 0.0168 (11) | 0.0080 (11) |
O1—C1 | 1.350 (2) | C5—C6 | 1.372 (3) |
O1—H1 | 0.92 (3) | C5—H5 | 0.9300 |
N1—C7 | 1.378 (2) | C6—H6 | 0.9300 |
N1—C10 | 1.395 (2) | C9—C11i | 1.386 (3) |
N1—C12 | 1.442 (2) | C9—C10 | 1.407 (3) |
N2—C7 | 1.334 (2) | C10—C11 | 1.383 (3) |
N2—C9 | 1.391 (2) | C11—C9i | 1.386 (3) |
N3—C15 | 1.395 (3) | C11—H11 | 0.9300 |
N3—H3A | 0.90 (3) | C12—C17 | 1.373 (3) |
N3—H3B | 0.91 (2) | C12—C13 | 1.379 (3) |
C1—C6 | 1.390 (3) | C13—C14 | 1.375 (3) |
C1—C2 | 1.413 (3) | C13—H13 | 0.9300 |
C2—C3 | 1.391 (3) | C14—C15 | 1.378 (3) |
C2—C7 | 1.460 (3) | C14—H14 | 0.9300 |
C3—C4 | 1.379 (3) | C15—C16 | 1.387 (3) |
C3—H3 | 0.9300 | C16—C17 | 1.372 (3) |
C4—C5 | 1.377 (3) | C16—H16 | 0.9300 |
C4—H4 | 0.9300 | C17—H17 | 0.9300 |
C1—O1—H1 | 108.4 (15) | N1—C7—C2 | 126.65 (17) |
C7—N1—C10 | 107.06 (15) | C11i—C9—N2 | 129.41 (18) |
C7—N1—C12 | 130.96 (15) | C11i—C9—C10 | 121.67 (17) |
C10—N1—C12 | 121.10 (15) | N2—C9—C10 | 108.92 (17) |
C7—N2—C9 | 106.63 (16) | C11—C10—N1 | 130.18 (17) |
C15—N3—H3A | 113.7 (17) | C11—C10—C9 | 123.91 (17) |
C15—N3—H3B | 109.8 (16) | N1—C10—C9 | 105.91 (16) |
H3A—N3—H3B | 118 (2) | C10—C11—C9i | 114.41 (17) |
O1—C1—C6 | 117.47 (19) | C10—C11—H11 | 122.8 |
O1—C1—C2 | 122.94 (19) | C9i—C11—H11 | 122.8 |
C6—C1—C2 | 119.6 (2) | C17—C12—C13 | 119.79 (18) |
C3—C2—C1 | 117.61 (18) | C17—C12—N1 | 120.46 (17) |
C3—C2—C7 | 123.25 (18) | C13—C12—N1 | 119.65 (17) |
C1—C2—C7 | 119.06 (18) | C14—C13—C12 | 119.50 (19) |
C4—C3—C2 | 122.0 (2) | C14—C13—H13 | 120.3 |
C4—C3—H3 | 119.0 | C12—C13—H13 | 120.3 |
C2—C3—H3 | 119.0 | C13—C14—C15 | 121.7 (2) |
C5—C4—C3 | 119.4 (2) | C13—C14—H14 | 119.2 |
C5—C4—H4 | 120.3 | C15—C14—H14 | 119.2 |
C3—C4—H4 | 120.3 | C14—C15—C16 | 117.68 (19) |
C6—C5—C4 | 120.3 (2) | C14—C15—N3 | 121.4 (2) |
C6—C5—H5 | 119.9 | C16—C15—N3 | 120.9 (2) |
C4—C5—H5 | 119.9 | C17—C16—C15 | 121.1 (2) |
C5—C6—C1 | 120.9 (2) | C17—C16—H16 | 119.4 |
C5—C6—H6 | 119.6 | C15—C16—H16 | 119.4 |
C1—C6—H6 | 119.6 | C16—C17—C12 | 120.1 (2) |
N2—C7—N1 | 111.48 (16) | C16—C17—H17 | 120.0 |
N2—C7—C2 | 121.87 (17) | C12—C17—H17 | 120.0 |
Symmetry code: (i) −x, −y+1, −z+1. |
Cg is the centroid of the C1–C6 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N2 | 0.92 | 1.76 | 2.582 (2) | 147 |
C14—H14···Cgii | 0.93 | 2.60 | 3.514 (2) | 167 |
Symmetry code: (ii) x, −y+1/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C32H24N6O2 |
Mr | 524.57 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 298 |
a, b, c (Å) | 6.5181 (3), 13.3206 (7), 14.3081 (7) |
β (°) | 91.680 (4) |
V (Å3) | 1241.77 (11) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.3 × 0.1 × 0.1 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur CCD |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 15503, 2702, 1605 |
Rint | 0.052 |
(sin θ/λ)max (Å−1) | 0.639 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.053, 0.123, 1.02 |
No. of reflections | 2702 |
No. of parameters | 190 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.17, −0.16 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2003), CrysAlis RED (Oxford Diffraction, 2003), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997), WinGX (Farrugia, 1999), PARST97 (Nardelli, 1995) and Mercury (Macrae et al., 2008).
Cg is the centroid of the C1–C6 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···N2 | 0.92 | 1.76 | 2.582 (2) | 147 |
C14—H14···Cgi | 0.93 | 2.60 | 3.514 (2) | 167 |
Symmetry code: (i) x, −y+1/2, z+1/2. |
Acknowledgements
Financial support by the Ministry of Science, Education and Sport of the Republic of Croatia is gratefully acknowledged (grant No. 119–1193079–3069).
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Benzodiimidazole and its derivatives are capable of adopting various coordination modes as well as forming multiple hydrogen bonds, which may provide a tool in crystal-engineering design for assembling building blocks into multi-dimensional structures (Aakeröy et al., 2001; Holman et al., 2001; Lin et al., 2004; Boydston et al., 2006; Boydston et al., 2007; Jiang et al., 2008). These compounds as potential complexing agents have been extensively investigated in recent years and were found to have a broad scope for spin crossover and biological activity. Benzodiimidazole and its derivatives are potential antitumor agents as inhibitors (Schulz & Skibo, 2000; Ansari & Lal, 2009; Demirayak, et al., 2011) and some of their metal complexes have the property of metal-to-ligand charge-transfer excited states (Ohno et al.,1992; Wang et al., 2011).
In this paper we report the synthesis and solid state structure of a novel heterocyclic system, the compound (I) containing benzodiimidazole core as a central moiety. The imidazole rings of later are substituted with 2–OH– and 4–aminobenzyl. Molecule is centrosymmetric with imposed inversion centre and placed in 2(a) special position of the space group P21/c. Molecular stereochemistry is defined by orientation of 2–OH– and 4–aminobenzyl substituent planes to the plane of benzodiimidazole (Fig. 1). Although 2-OH-benzyl is involved in forming of strong intramolecular O1–H···N2 hydrogen bond [O1-H···N2, 2.582 (2) Å] with benzodiimidazole moiety its plane deviates significantly from coplanarity with benzodiimidazole (interplanar angle 12.69°). Due to the spatial reasons the interplanar angle between the planes of 4–aminobenzyl and benzodiimidazole is 84.71°. A weak intermolecular hydrogen interactions C14–H14···πi [3.514 Å (i): x, –y–1/2, z –1/2; π refers to the C1–C6 aromatic system centroid] linked molecules into a two-dimensional network. Surprisingly, primary N3 amino groups are not involved in significant intermolecular interactions. Nevertheless, weak attraction probably exists between primary amino group with C12-to-C17 aromatic ring at the distance slightly less than 3.5 Å (Fig. 2). Crystal packing is shown in Fig. 3.