(E)-3-{[(2-Bromo-3-methyl­phen­yl)imino]­meth­yl}benzene-1,2-diol: crystal structure and Hirshfeld surface analysis

Doğan, O.E.; Dege, N.; Ağar, E.; Fritsky, I.O.

doi:10.1107/S2056989019015718

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ISSN: 2056-9890

Volume 75| Part 12| December 2019| Pages 1930-1933

https://doi.org/10.1107/S2056989019015718

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(E)-3-{[(2-Bromo-3-methylphenyl)imino]methyl}benzene-1,2-diol: crystal structure and Hirshfeld surface analysis

Onur Erman Doğan,^a ^* Necmi Dege,^b ^* Erbil Ağar ^a and Igor O. Fritsky ^c ^*

^aOndokuz Mayıs University, Faculty of Arts and Sciences, Department of Chemistry, 55139 Samsun, Turkey, ^bOndokuz Mayıs University, Faculty of Arts and Sciences, Department of Physics, 55139 Samsun, Turkey, and ^cDepartment of Chemistry, Taras Shevchenko National University of Kyiv, 64, Vladimirska Str., Kiev 01601, Ukraine
^*Correspondence e-mail: oedogan@omu.edu.tr, necmid@omu.edu.tr, ifritsky@univ.kiev.ua

Edited by J. T. Mague, Tulane University, USA (Received 17 October 2019; accepted 20 November 2019; online 26 November 2019)

The title compound, C₁₄H₁₂BrNO₂, was synthesized by the condensation reaction of 2,3-dihydroxybenzaldehyde and 2-bromo-3-methylaniline. It crystallizes in the centrosymmetric triclinic space group P $[\overline{1}]$ . The configuration about the C=N bond is E. The dihedral angle between the planes of the 5-(2-bromo-3-methylphenyl ring and the catechol ring is 2.80 (17)°. In the crystal, O—H⋯O hydrogen-bond interactions consolidate the crystal packing.

Keywords: crystal structure; Schiff base; O⋯O interaction; Hirshfeld surface analysis; hydrogen bonds.

CCDC reference: 1967023

1. Chemical context

Schiff bases containing an azomethine or imine (–C=N–) unit are condensation products of primary amines and carbonyl compounds that were first reported by Hugo Schiff (1864 ). Schiff bases have a wide variety of applications in many areas of biological, organic and inorganic chemistry. The medicinal uses and applications of Schiff bases and their metal complexes are of increasing clinical and commercial importance and are increasingly significant in the medicinal and pharmaceutical fields because of their extensive range of biological activities (Karthikeyan et al., 2006 ).

2. Structural commentary

The structure of the title compound is shown in Fig. 1. It crystallizes in the centrosymmetric P $[\overline{1}]$ space group with Z = 4 (Z′ = 2). The two crystallographically independent molecules have nearly the same geometrical parameters and the primary difference between them is the rotational orientation of H2 and H4A. The discussion will therefore be limited to that of the molecule containing O1. The molecular structure is constructed from two individually planar rings. The whole molecule is approximately planar, with a maximum deviation of 0.117 (3) Å from planarity for the hydroxyl O1 atom of the catechol ring. The dihedral angle between the two benzene ring planes is 2.80 (17)°. The methyl C1 atom deviates from the plane of the C2–C7 benzene ring by 0.039 (2) Å while C9 deviates from the plane of the C9–C14 benzene ring by 0.024 (3) Å. The C8—N1—C7—C6 and C14— C9—C8—N1 torsion angles are −1.6 (5) and −1.1 (5)°, respectively. The planar molecular conformation of each molecule is stabilized by an intramolecular O—H⋯N hydrogen bond (Table 1).

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N1	0.82	1.85	2.571 (3)	146
O3—H3⋯N2	0.82	1.85	2.560 (3)	145
O4—H4A⋯O1	0.82	2.02	2.790 (4)	157
O2—H2⋯O3	0.82	2.11	2.875 (3)	156
C8—H8⋯O4ⁱ	0.93	2.54	3.383 (4)	151
Symmetry code: (i) -x, -y+1, -z+1.

Figure 1
The molecular structure of the title compound with the atomic numbering scheme. The dashed lines indicate the intramolecular O—H⋯N hydrogen bonds. Displacement ellipsoids are drawn at the 30% probability level.

3. Supramolecular features

In the crystal, the Schiff base units are linked by O—H⋯O and C—H⋯O hydrogen bonds (O4—H4A⋯O1, O2—H2⋯O3 and C8—H8⋯O4ⁱ; symmetry code as in Table 1), forming a tape structure along the a-axis direction (Fig. 2). The tapes are stacked into layers parallel to the benzene plane via π–π interactions (Fig. 2) with centroid–centroid distances of 3.750 (2) and 3.783 (2) Å, respectively, for Cg1⋯Cg2(1 − x, 1 − y, 1 − z) and Cg3⋯Cg4(−x, 1 − y, −z), where Cg1, Cg2, Cg3 and Cg4 are the centroids of the C2–C7, C9–C14, C16–C21 and C23–C28 rings, respectively.

Figure 2
A partial view of the crystal packing of the title compound. Intra- and intermolecular hydrogen bonds are shown as dotted lines while the π-stacking interactions are depicted by dashed lines.

4. Database survey

A search of the Cambridge Structural Database (CSD, version 5.40, update Nov 2018; Groom et al., 2016 ) for the (E)-N-(2-bromophenyl)-1-phenylmethanimine skeleton yielded nine hits. The N1—C8 bond in the title structure is the same length within standard uncertainties as those in the structures of 2-bromo-N-salicylideneaniline (Burr & Hobson, 1969 ), N-(2-bromophenyl)-1-(2-fluorophenyl)methanimine (Kaur & Choudhury, 2014 ), 2-[(E)-(2,4-dibromophenylimino)methyl]-4-bromophenol (Bharti et al., 2017 ), N-(2-bromo-4-methylphenyl)naphthaldimine (Elmali et al., 1998 ), N-(2-methylbenzylidene)-2-bromoaniline (Ojala et al., 2007 ), 2-{[(2-bromophenyl)imino]methyl}-4-chlorophenol (Guo, 2011 ), 2-{[(2-bromophenyl)imino]methyl}-4-chlorophenol (Zhao & Zhang, 2012 ), 2-{[(2-bromophenyl)imino]methyl}-6-methylphenol (Karadağ et al., 2010 ), 2-{[(2-bromophenyl)imino]methyl}-4-(trifluoromethoxy)phenol (Tanak et al., 2012 ). The C=N bond lengths in these structures vary from 1.270 (3) to 1.295 (5) Å and the C—O bond lengths from 1.336 (5) to 1.366 (2) Å. The molecular conformations of these structures are also not planar, with dihedral angles between the phenyl rings varying between 5.00 (5) and 47.62 (9)°. It is likely that the intramolecular O—H⋯N hydrogen bond, where the imine N atom acts as an hydrogen-bond acceptor, is an important prerequisite for the tautomeric shift toward the phenol–imine form. In fact, in all eight structures of the phenol–imine tautomers, hydrogen bonds of this type are observed.

5. Hirshfeld surface analysis

Hirshfeld surface analysis of the title compound was performed utilizing the CrystalExplorer program (Turner et al., 2017 ). The three-dimensional d_norm surface is a useful tool for analysing and visualizing the intermolecular interactions and utilizes the function of the normalized distances d_e and d_i, where d_e and d_i are the distances from a given point on the surface to the nearest atom outside and inside, respectively. The blue, white and red colour convention used for the d_norm-mapped Hirshfeld surfaces indicates the interatomic contacts longer, equal to or shorter than the van der Waals separations. The standard-resolution molecular three-dimensional (d_norm) plot with d_e and d_i for the title compound is shown in Fig. 3. The bright-red spots near the oxygen and hydrogen atoms indicate donors and acceptors of a potential O—H⋯O interaction. As can be seen from the two-dimensional fingerprint plots (scattering points spread up to d_e = d_i = 1.5 Å; Fig. 4), the dominant interaction in the title compound originates from H⋯H contacts, which are the major contributor (42.4%) to the total Hirshfeld surface. The contribution from the O⋯H/H⋯O contacts (13.5%) is represented by a pair of sharp spikes that are characteristic of hydrogen-bonding interactions (Fig. 4). Other significant interactions are Br⋯H/H⋯Br (12.9%) and C⋯H/H⋯C (15.3%). While it is likely there are other identifiable points of contact that can be highlighted in the crystal, these may be of limited significance and do not require detailed discussion nor illustration. The interactions are visualized in Fig. 5.

Figure 3
View of the three-dimensional Hirshfeld surface of the title compound plotted over d_norm, d_e and d_i.

Figure 4
Two-dimensional fingerprint plots of the crystal with the relative contributions of the atom pairs to the Hirshfeld surface.

Figure 5
Hirshfeld surface mapped over d_norm to visualize the intermolecular interactions.

6. Synthesis and crystallization

A mixture of 2,3-dihydroxybenzaldehyde (34.5 mg, 0.25 mmol) and 2-bromo-3-methylaniline (46.5 mg, 0.25 mmol) was stirred with ethanol (30 mL) at 377 K for 5 h, affording the title compound (49.73 mg, yield 65% m.p. 410–412 K). Single crystals suitable for X-ray measurements were obtained by recrystallization from ethanol at room temperature.

7. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2. The hydroxy H atom was located in a difference-Fourier map, and the hydroxy group was allowed to rotate during the refinement procedure (AFIX 147); O—H = 0.82 Å with U_iso(H) = 1.5U_eq(O). The C-bound H atoms were positioned geometrically and refined using a riding model: C—H = 0.93 Å with U_iso(H) = 1.2U_eq(C) for aromatic H atoms and C—H = 0.96 Å with U_iso(H) = 1.5U_eq(C) for methyl H atoms.

Table 2
Experimental details

Crystal data
Chemical formula	C₁₄H₁₂BrNO₂
M_r	306.16
Crystal system, space group	Triclinic, P $[\overline{1}]$
Temperature (K)	296
a, b, c (Å)	8.2301 (5), 10.1593 (6), 15.9428 (9)
α, β, γ (°)	102.496 (5), 90.597 (5), 103.213 (5)
V (Å³)	1264.46 (13)
Z	4
Radiation type	Mo Kα
μ (mm⁻¹)	3.24
Crystal size (mm)	0.49 × 0.31 × 0.21

Data collection
Diffractometer	Stoe IPDS 2
Absorption correction	Integration (X-RED32; Stoe & Cie, 2002 )
T_min, T_max	0.441, 0.663
No. of measured, independent and observed [I > 2σ(I)] reflections	13105, 4958, 3352
R_int	0.044
(sin θ/λ)_max (Å⁻¹)	0.617

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.038, 0.081, 0.97
No. of reflections	4958
No. of parameters	331
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.38, −0.26
Computer programs: X-AREA and X-RED32 (Stoe & Cie, 2002), SHELXT2018 (Sheldrick, 2015a ), SHELXL2018 (Sheldrick, 2015b ), ORTEP-3 for Windows and WinGX (Farrugia, 2012 ), Mercury (Macrae et al., 2006 ) and PLATON (Spek, 2009 ).

Supporting information

CCDC reference: 1967023

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989019015718/mw2151sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989019015718/mw2151Isup2.hkl

Supporting information file. DOI: https://doi.org/10.1107/S2056989019015718/mw2151Isup3.cml

checkCIF report

Computing details top

Data collection: X-AREA (Stoe & Cie, 2002); cell refinement: X-AREA (Stoe & Cie, 2002); data reduction: X-RED32 (Stoe & Cie, 2002); program(s) used to solve structure: WinGX (Farrugia, 2012); program(s) used to refine structure: SHELXT2018 (Sheldrick, 2015a), SHELXL2018 (Sheldrick, 2015b); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: Mercury (Macrae et al., 2006), WinGX (Farrugia, 2012) and PLATON (Spek, 2009).

(E)-3-{[(2-Bromo-3-methylphenyl)imino]methyl}benzene-1,2-diol top

Crystal data top

C₁₄H₁₂BrNO₂	Z = 4
M_r = 306.16	F(000) = 616
Triclinic, P1	D_x = 1.608 Mg m⁻³
a = 8.2301 (5) Å	Mo Kα radiation, λ = 0.71073 Å
b = 10.1593 (6) Å	Cell parameters from 15203 reflections
c = 15.9428 (9) Å	θ = 2.1–32.4°
α = 102.496 (5)°	µ = 3.24 mm⁻¹
β = 90.597 (5)°	T = 296 K
γ = 103.213 (5)°	Column, red
V = 1264.46 (13) Å³	0.49 × 0.31 × 0.21 mm

Data collection top

Stoe IPDS 2 diffractometer	4958 independent reflections
Radiation source: sealed X-ray tube, 12 x 0.4 mm long-fine focus	3352 reflections with I > 2σ(I)
Plane graphite monochromator	R_int = 0.044
Detector resolution: 6.67 pixels mm^-1	θ_max = 26.0°, θ_min = 2.1°
rotation method scans	h = −10→10
Absorption correction: integration (X-RED32; Stoe & Cie, 2002)	k = −12→12
T_min = 0.441, T_max = 0.663	l = −19→19
13105 measured reflections

Refinement top

Refinement on F²	Primary atom site location: intrinsic phasing
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.038	H-atom parameters constrained
wR(F²) = 0.081	w = 1/[σ²(F_o²) + (0.0365P)²] where P = (F_o² + 2F_c²)/3
S = 0.97	(Δ/σ)_max = 0.001
4958 reflections	Δρ_max = 0.38 e Å⁻³
331 parameters	Δρ_min = −0.26 e Å⁻³
0 restraints

Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
Br1	0.47553 (5)	0.73422 (3)	0.43378 (2)	0.06496 (13)
Br2	0.27549 (6)	0.20843 (4)	0.05124 (2)	0.07628 (15)
O1	0.1481 (3)	0.4451 (2)	0.34610 (15)	0.0653 (7)
H1	0.211056	0.487560	0.388310	0.098*
O3	0.1364 (4)	0.4958 (2)	0.16060 (16)	0.0691 (7)
H3	0.189385	0.466512	0.120398	0.104*
N1	0.2564 (3)	0.5099 (2)	0.50502 (16)	0.0470 (6)
N2	0.2469 (3)	0.4778 (3)	0.01003 (16)	0.0532 (7)
O4	0.0206 (4)	0.6518 (3)	0.29811 (17)	0.0822 (8)
H4A	0.064074	0.586678	0.297637	0.123*
O2	−0.0441 (4)	0.2540 (3)	0.21486 (16)	0.0897 (9)
H2	0.016348	0.330320	0.214834	0.135*
C7	0.3645 (4)	0.6053 (3)	0.57103 (19)	0.0457 (7)
C9	0.0451 (4)	0.3067 (3)	0.4473 (2)	0.0469 (7)
C8	0.1507 (4)	0.4002 (3)	0.5163 (2)	0.0490 (7)
H8	0.143775	0.382141	0.571109	0.059*
C2	0.4759 (4)	0.7195 (3)	0.5508 (2)	0.0458 (7)
C14	0.0503 (4)	0.3320 (3)	0.3637 (2)	0.0500 (8)
C16	0.3400 (4)	0.2699 (3)	−0.0509 (2)	0.0531 (8)
C21	0.3160 (4)	0.3988 (3)	−0.0583 (2)	0.0525 (8)
C23	0.1469 (4)	0.6720 (3)	0.0803 (2)	0.0538 (8)
C22	0.2142 (4)	0.5943 (4)	0.0084 (2)	0.0584 (9)
H22	0.234551	0.629736	−0.040566	0.070*
C28	0.1130 (4)	0.6197 (3)	0.1544 (2)	0.0525 (8)
C12	−0.1530 (5)	0.1178 (3)	0.3120 (2)	0.0645 (9)
H12	−0.218773	0.053589	0.266809	0.077*
C3	0.5838 (4)	0.8201 (3)	0.6109 (2)	0.0534 (8)
C17	0.4073 (4)	0.1854 (4)	−0.1138 (2)	0.0613 (9)
C26	0.0233 (5)	0.8244 (4)	0.2207 (3)	0.0676 (10)
H26	−0.017827	0.875467	0.267836	0.081*
C27	0.0531 (4)	0.6990 (4)	0.2243 (2)	0.0603 (9)
C13	−0.0486 (4)	0.2341 (3)	0.2961 (2)	0.0586 (9)
C10	−0.0661 (4)	0.1862 (3)	0.4616 (2)	0.0593 (9)
H10	−0.073250	0.169793	0.516793	0.071*
C20	0.3657 (5)	0.4421 (4)	−0.1328 (2)	0.0656 (10)
H20	0.351806	0.527272	−0.140140	0.079*
C11	−0.1625 (5)	0.0941 (4)	0.3947 (3)	0.0669 (10)
H11	−0.235219	0.014899	0.404432	0.080*
C4	0.5836 (5)	0.8024 (4)	0.6942 (2)	0.0641 (9)
H4	0.656723	0.867053	0.736383	0.077*
C24	0.1153 (5)	0.8017 (4)	0.0781 (3)	0.0666 (10)
H24	0.136398	0.837047	0.029072	0.080*
C6	0.3679 (5)	0.5952 (3)	0.6565 (2)	0.0597 (9)
H6	0.294647	0.522244	0.673039	0.072*
C5	0.4778 (5)	0.6914 (4)	0.7163 (2)	0.0710 (11)
H5	0.481124	0.681646	0.772972	0.085*
C18	0.4550 (5)	0.2344 (4)	−0.1862 (2)	0.0675 (10)
H18	0.501793	0.180660	−0.229667	0.081*
C25	0.0539 (5)	0.8763 (4)	0.1473 (3)	0.0710 (10)
H25	0.032795	0.961647	0.145094	0.085*
C19	0.4346 (5)	0.3615 (4)	−0.1952 (2)	0.0743 (11)
H19	0.468248	0.392695	−0.244387	0.089*
C1	0.6961 (5)	0.9453 (3)	0.5889 (3)	0.0729 (11)
H1B	0.774499	0.916334	0.549065	0.109*
H1C	0.755569	1.004995	0.640409	0.109*
H1D	0.629921	0.994500	0.563320	0.109*
C15	0.4311 (6)	0.0463 (4)	−0.1053 (3)	0.0857 (12)
H15A	0.501966	0.057822	−0.054737	0.129*
H15B	0.482042	0.005655	−0.155138	0.129*
H15C	0.324472	−0.013470	−0.100577	0.129*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Br1	0.0871 (3)	0.0575 (2)	0.0514 (2)	0.01015 (18)	0.01253 (18)	0.02160 (16)
Br2	0.1074 (3)	0.0777 (3)	0.0517 (2)	0.0241 (2)	0.0085 (2)	0.02912 (19)
O1	0.0832 (18)	0.0563 (13)	0.0492 (13)	−0.0038 (12)	−0.0037 (12)	0.0181 (11)
O3	0.095 (2)	0.0653 (14)	0.0560 (15)	0.0260 (13)	0.0267 (13)	0.0235 (12)
N1	0.0517 (16)	0.0429 (13)	0.0485 (15)	0.0138 (12)	0.0063 (12)	0.0120 (11)
N2	0.0559 (17)	0.0566 (15)	0.0434 (15)	0.0037 (13)	0.0064 (12)	0.0133 (12)
O4	0.110 (2)	0.096 (2)	0.0532 (15)	0.0456 (17)	0.0244 (15)	0.0214 (14)
O2	0.115 (2)	0.0826 (18)	0.0498 (15)	−0.0168 (16)	−0.0007 (14)	0.0115 (13)
C7	0.0526 (19)	0.0452 (15)	0.0429 (16)	0.0179 (14)	0.0054 (14)	0.0107 (13)
C9	0.0467 (19)	0.0469 (16)	0.0495 (18)	0.0145 (14)	0.0074 (14)	0.0123 (14)
C8	0.052 (2)	0.0548 (17)	0.0459 (17)	0.0204 (15)	0.0081 (15)	0.0160 (14)
C2	0.0482 (19)	0.0482 (15)	0.0479 (17)	0.0212 (14)	0.0097 (14)	0.0144 (13)
C14	0.052 (2)	0.0486 (16)	0.0497 (18)	0.0118 (14)	0.0095 (15)	0.0107 (14)
C16	0.050 (2)	0.0652 (19)	0.0398 (17)	0.0051 (16)	−0.0037 (14)	0.0126 (15)
C21	0.050 (2)	0.0598 (18)	0.0447 (18)	0.0037 (15)	0.0022 (15)	0.0155 (15)
C23	0.0451 (19)	0.0603 (18)	0.0529 (19)	0.0031 (15)	0.0017 (15)	0.0158 (15)
C22	0.053 (2)	0.068 (2)	0.054 (2)	0.0024 (17)	0.0030 (16)	0.0263 (17)
C28	0.051 (2)	0.0578 (18)	0.0454 (18)	0.0059 (15)	0.0039 (15)	0.0117 (15)
C12	0.062 (2)	0.0557 (19)	0.066 (2)	0.0038 (17)	0.0031 (18)	0.0029 (16)
C3	0.052 (2)	0.0503 (17)	0.059 (2)	0.0159 (15)	0.0051 (16)	0.0100 (15)
C17	0.058 (2)	0.072 (2)	0.050 (2)	0.0108 (18)	−0.0099 (17)	0.0095 (17)
C26	0.059 (2)	0.072 (2)	0.067 (2)	0.0160 (19)	0.0002 (18)	0.0036 (18)
C27	0.057 (2)	0.066 (2)	0.054 (2)	0.0095 (17)	0.0022 (16)	0.0113 (16)
C13	0.063 (2)	0.0601 (19)	0.051 (2)	0.0121 (17)	0.0086 (16)	0.0112 (16)
C10	0.056 (2)	0.0600 (19)	0.065 (2)	0.0098 (17)	0.0154 (17)	0.0250 (17)
C20	0.082 (3)	0.070 (2)	0.0445 (19)	0.0119 (19)	0.0161 (18)	0.0191 (17)
C11	0.057 (2)	0.059 (2)	0.081 (3)	0.0024 (17)	0.012 (2)	0.0190 (19)
C4	0.062 (2)	0.067 (2)	0.057 (2)	0.0120 (18)	−0.0103 (17)	0.0047 (17)
C24	0.065 (2)	0.065 (2)	0.074 (3)	0.0099 (18)	0.0035 (19)	0.0310 (19)
C6	0.067 (2)	0.0626 (19)	0.0497 (19)	0.0089 (17)	0.0052 (17)	0.0206 (16)
C5	0.085 (3)	0.079 (2)	0.046 (2)	0.008 (2)	−0.0057 (19)	0.0187 (18)
C18	0.065 (2)	0.086 (3)	0.046 (2)	0.016 (2)	0.0061 (18)	0.0049 (18)
C25	0.067 (3)	0.059 (2)	0.086 (3)	0.0149 (19)	0.003 (2)	0.014 (2)
C19	0.084 (3)	0.089 (3)	0.052 (2)	0.013 (2)	0.017 (2)	0.026 (2)
C1	0.068 (3)	0.056 (2)	0.089 (3)	0.0034 (18)	0.000 (2)	0.0165 (19)
C15	0.106 (4)	0.092 (3)	0.069 (3)	0.045 (3)	0.002 (2)	0.015 (2)

Geometric parameters (Å, º) top

Br1—C2	1.903 (3)	C12—C11	1.391 (5)
Br2—C16	1.905 (3)	C12—H12	0.9300
O1—C14	1.330 (3)	C3—C4	1.379 (5)
O1—H1	0.8200	C3—C1	1.502 (4)
O3—C28	1.340 (4)	C17—C18	1.379 (5)
O3—H3	0.8200	C17—C15	1.504 (5)
N1—C8	1.295 (4)	C26—C27	1.364 (5)
N1—C7	1.408 (4)	C26—C25	1.388 (5)
N2—C22	1.277 (4)	C26—H26	0.9300
N2—C21	1.413 (4)	C10—C11	1.361 (5)
O4—C27	1.370 (4)	C10—H10	0.9300
O4—H4A	0.8200	C20—C19	1.361 (5)
O2—C13	1.354 (4)	C20—H20	0.9300
O2—H2	0.8200	C11—H11	0.9300
C7—C6	1.390 (4)	C4—C5	1.373 (5)
C7—C2	1.404 (4)	C4—H4	0.9300
C9—C14	1.411 (4)	C24—C25	1.368 (5)
C9—C10	1.415 (4)	C24—H24	0.9300
C9—C8	1.421 (4)	C6—C5	1.363 (5)
C8—H8	0.9300	C6—H6	0.9300
C2—C3	1.377 (5)	C5—H5	0.9300
C14—C13	1.399 (5)	C18—C19	1.377 (5)
C16—C17	1.381 (5)	C18—H18	0.9300
C16—C21	1.397 (5)	C25—H25	0.9300
C21—C20	1.388 (4)	C19—H19	0.9300
C23—C28	1.403 (4)	C1—H1B	0.9600
C23—C24	1.408 (5)	C1—H1C	0.9600
C23—C22	1.436 (5)	C1—H1D	0.9600
C22—H22	0.9300	C15—H15A	0.9600
C28—C27	1.392 (5)	C15—H15B	0.9600
C12—C13	1.367 (4)	C15—H15C	0.9600

C14—O1—H1	109.5	C26—C27—O4	118.4 (3)
C28—O3—H3	109.5	C26—C27—C28	121.0 (3)
C8—N1—C7	124.1 (3)	O4—C27—C28	120.7 (3)
C22—N2—C21	123.9 (3)	O2—C13—C12	119.2 (3)
C27—O4—H4A	109.5	O2—C13—C14	120.7 (3)
C13—O2—H2	109.5	C12—C13—C14	120.1 (3)
C6—C7—C2	116.9 (3)	C11—C10—C9	120.1 (3)
C6—C7—N1	124.1 (3)	C11—C10—H10	120.0
C2—C7—N1	119.0 (3)	C9—C10—H10	120.0
C14—C9—C10	119.1 (3)	C19—C20—C21	120.8 (4)
C14—C9—C8	120.6 (3)	C19—C20—H20	119.6
C10—C9—C8	120.2 (3)	C21—C20—H20	119.6
N1—C8—C9	121.8 (3)	C10—C11—C12	120.4 (3)
N1—C8—H8	119.1	C10—C11—H11	119.8
C9—C8—H8	119.1	C12—C11—H11	119.8
C3—C2—C7	123.4 (3)	C5—C4—C3	121.4 (3)
C3—C2—Br1	119.0 (2)	C5—C4—H4	119.3
C7—C2—Br1	117.6 (2)	C3—C4—H4	119.3
O1—C14—C13	118.4 (3)	C25—C24—C23	120.7 (3)
O1—C14—C9	122.3 (3)	C25—C24—H24	119.7
C13—C14—C9	119.3 (3)	C23—C24—H24	119.7
C17—C16—C21	123.3 (3)	C5—C6—C7	120.4 (3)
C17—C16—Br2	118.8 (3)	C5—C6—H6	119.8
C21—C16—Br2	118.0 (3)	C7—C6—H6	119.8
C20—C21—C16	116.9 (3)	C6—C5—C4	121.0 (3)
C20—C21—N2	124.1 (3)	C6—C5—H5	119.5
C16—C21—N2	118.9 (3)	C4—C5—H5	119.5
C28—C23—C24	118.9 (3)	C19—C18—C17	121.1 (4)
C28—C23—C22	120.2 (3)	C19—C18—H18	119.4
C24—C23—C22	121.0 (3)	C17—C18—H18	119.4
N2—C22—C23	121.8 (3)	C24—C25—C26	119.9 (4)
N2—C22—H22	119.1	C24—C25—H25	120.1
C23—C22—H22	119.1	C26—C25—H25	120.1
O3—C28—C27	118.5 (3)	C20—C19—C18	120.7 (3)
O3—C28—C23	122.3 (3)	C20—C19—H19	119.6
C27—C28—C23	119.1 (3)	C18—C19—H19	119.6
C13—C12—C11	121.0 (3)	C3—C1—H1B	109.5
C13—C12—H12	119.5	C3—C1—H1C	109.5
C11—C12—H12	119.5	H1B—C1—H1C	109.5
C2—C3—C4	116.8 (3)	C3—C1—H1D	109.5
C2—C3—C1	122.8 (3)	H1B—C1—H1D	109.5
C4—C3—C1	120.4 (3)	H1C—C1—H1D	109.5
C18—C17—C16	117.1 (3)	C17—C15—H15A	109.5
C18—C17—C15	120.2 (4)	C17—C15—H15B	109.5
C16—C17—C15	122.7 (3)	H15A—C15—H15B	109.5
C27—C26—C25	120.5 (4)	C17—C15—H15C	109.5
C27—C26—H26	119.8	H15A—C15—H15C	109.5
C25—C26—H26	119.8	H15B—C15—H15C	109.5

C8—N1—C7—C6	−1.6 (5)	Br2—C16—C17—C15	0.3 (5)
C8—N1—C7—C2	179.0 (3)	C25—C26—C27—O4	−179.9 (3)
C7—N1—C8—C9	−179.6 (3)	C25—C26—C27—C28	−0.7 (5)
C14—C9—C8—N1	−1.1 (5)	O3—C28—C27—C26	−178.5 (3)
C10—C9—C8—N1	178.5 (3)	C23—C28—C27—C26	1.6 (5)
C6—C7—C2—C3	−0.9 (5)	O3—C28—C27—O4	0.8 (5)
N1—C7—C2—C3	178.5 (3)	C23—C28—C27—O4	−179.2 (3)
C6—C7—C2—Br1	179.2 (2)	C11—C12—C13—O2	−179.4 (4)
N1—C7—C2—Br1	−1.4 (4)	C11—C12—C13—C14	−0.4 (6)
C10—C9—C14—O1	178.0 (3)	O1—C14—C13—O2	0.2 (5)
C8—C9—C14—O1	−2.4 (5)	C9—C14—C13—O2	−178.7 (3)
C10—C9—C14—C13	−3.1 (5)	O1—C14—C13—C12	−178.8 (3)
C8—C9—C14—C13	176.5 (3)	C9—C14—C13—C12	2.2 (5)
C17—C16—C21—C20	−1.0 (5)	C14—C9—C10—C11	2.0 (5)
Br2—C16—C21—C20	179.3 (2)	C8—C9—C10—C11	−177.5 (3)
C17—C16—C21—N2	−179.7 (3)	C16—C21—C20—C19	0.0 (5)
Br2—C16—C21—N2	0.6 (4)	N2—C21—C20—C19	178.6 (3)
C22—N2—C21—C20	4.1 (5)	C9—C10—C11—C12	−0.2 (6)
C22—N2—C21—C16	−177.3 (3)	C13—C12—C11—C10	−0.7 (6)
C21—N2—C22—C23	−178.8 (3)	C2—C3—C4—C5	−1.5 (6)
C28—C23—C22—N2	−0.9 (5)	C1—C3—C4—C5	177.7 (4)
C24—C23—C22—N2	178.5 (3)	C28—C23—C24—C25	0.6 (5)
C24—C23—C28—O3	178.5 (3)	C22—C23—C24—C25	−178.9 (3)
C22—C23—C28—O3	−2.1 (5)	C2—C7—C6—C5	−1.3 (5)
C24—C23—C28—C27	−1.5 (5)	N1—C7—C6—C5	179.3 (3)
C22—C23—C28—C27	177.9 (3)	C7—C6—C5—C4	2.0 (6)
C7—C2—C3—C4	2.3 (5)	C3—C4—C5—C6	−0.6 (6)
Br1—C2—C3—C4	−177.8 (3)	C16—C17—C18—C19	−0.6 (5)
C7—C2—C3—C1	−176.9 (3)	C15—C17—C18—C19	−179.9 (4)
Br1—C2—C3—C1	3.0 (5)	C23—C24—C25—C26	0.4 (6)
C21—C16—C17—C18	1.3 (5)	C27—C26—C25—C24	−0.4 (6)
Br2—C16—C17—C18	−179.0 (2)	C21—C20—C19—C18	0.7 (6)
C21—C16—C17—C15	−179.5 (3)	C17—C18—C19—C20	−0.3 (6)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1···N1	0.82	1.85	2.571 (3)	146
O3—H3···Br2	0.82	2.86	3.499 (2)	136
O3—H3···N2	0.82	1.85	2.560 (3)	145
O4—H4A···O1	0.82	2.02	2.790 (4)	157
O4—H4A···O3	0.82	2.32	2.731 (4)	112
O2—H2···O1	0.82	2.29	2.724 (3)	114
O2—H2···O3	0.82	2.11	2.875 (3)	156
C8—H8···O4ⁱ	0.93	2.54	3.383 (4)	151

Symmetry code: (i) −x, −y+1, −z+1.

Acknowledgements

The authors acknowledge the Faculty of Arts and Sciences, Ondokuz Mayıs University, Turkey, for the use of the Stoe IPDS 2 diffractometer (purchased under grant F.279 of the University Research Fund).

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