organic compounds
(E)-N′-(5-Bromo-2-hydroxy-3-methoxybenzylidene)-1H-indole-3-carbohydrazide
aZibo Vocational Institute, Zibo 255314, People's Republic of China
*Correspondence e-mail: lixiaoyan_zb@126.com
There are three independent moleculesi n the 18H16BrN3O3, in which the dihedral angles between the indole and benzene rings are 76.9 (2), 4.9 (2), and 70.9 (2)°. All three molecules exist in a trans configuration with respect to the methylidene units. In each molecule, there is one intramolecular O—H⋯N hydrogen bond. In the crystal, N—H⋯O hydrogen bonds occur.
of the title compound, CRelated literature
For the syntheses and crystal structures of hydrazone compounds, see: Hashemian et al. (2011); Lei (2011); Shalash et al. (2010). For the crystal structures of similar compounds reported recently by the author, see: Li (2011a,b).
Experimental
Crystal data
|
Refinement
|
Data collection: SMART (Bruker, 1998); cell SAINT (Bruker, 1998); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536811039195/qm2030sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811039195/qm2030Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811039195/qm2030Isup3.cml
A mixture of 1H-indole-3-carbohydrazide (0.189 g, 1 mmol) and 5-bromo-2-hydroxy-3-methoxybenzaldehyde (0.231 g, 1 mmol) in 30 ml of ethanol containing few drops of acetic acid was refluxed for about 1 h. On cooling to room temperature, a solid precipitate was formed. The solid was filtered and then recrystallized from methanol. Colourless crystals, suitable for X-ray
were obtained by slow evaporation of a solution of the title compound in methanol.The NH H-atoms were located from a difference Fourier map and were freely refined. The OH and C-bound H-atoms were positioned geometrically and refined using a riding model: O—H = 0.82 Å, C—H = 0.93 – 0.97 Å, for CH, CH2 and CH3 H-atoms, with Uiso(H) = k × Ueq(O,C), where k = 1.5 for OH and CH3 H-atoms, and k = 1.2 for all other H-atoms.
In the last few years,
have attracted much attention for their syntheses and crystal structures (Hashemian et al., 2011; Lei, 2011; Shalash et al., 2010). As a continuation of our work on such compounds (Li, 2011a,b), the author reports herein on the of the new title hydrazone compound.In the
of the title compound there are three (A, B and C) independent molecules (Fig. 1). The bond distances and angles are comparable to those observed in similar compounds (Li, 2011a,b). The dihedral angles between the indole ring and the benzene ring in the three molecules are 76.9 (2), 175.1 (2), and 70.9 (2)° for molecules A, B and C, respectively. All the molecules exist in the trans configuration with respect to the methylidene units. In each molecule there is an O—H···N intramolecular hydrogen bond (Table 1).For the syntheses and crystal structures of hydrazone compounds, see: Hashemian et al. (2011); Lei (2011); Shalash et al. (2010). For the crystal structures of similar compounds reported recently by the author, see: Li (2011a,b).
Data collection: SMART (Bruker, 1998); cell
SAINT (Bruker, 1998); data reduction: SAINT (Bruker, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. The molecular structure of the three independent molecules of the title compound, showing the atom labelling scheme. The displacement ellipsoids are drawn at the 30% probability level. Intramolecular O—H···N hydrogen bonds are indicated by dashed lines. The C-bound H-atoms have been omitted for clarity. |
C18H16BrN3O3 | F(000) = 2448 |
Mr = 402.25 | Dx = 1.584 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
a = 15.023 (3) Å | Cell parameters from 2672 reflections |
b = 13.860 (3) Å | θ = 2.2–24.1° |
c = 24.856 (4) Å | µ = 2.46 mm−1 |
β = 102.192 (2)° | T = 298 K |
V = 5058.8 (17) Å3 | Block, colourless |
Z = 12 | 0.13 × 0.10 × 0.07 mm |
Bruker SMART CCD area-detector diffractometer | 8466 independent reflections |
Radiation source: fine-focus sealed tube | 3662 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.089 |
ω scans | θmax = 25.1°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −17→17 |
Tmin = 0.740, Tmax = 0.847 | k = −16→13 |
23383 measured reflections | l = −29→29 |
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)] = 0.051 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.125 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.97 | w = 1/[σ2(Fo2) + (0.0382P)2] where P = (Fo2 + 2Fc2)/3 |
8466 reflections | (Δ/σ)max = 0.001 |
700 parameters | Δρmax = 0.37 e Å−3 |
24 restraints | Δρmin = −0.40 e Å−3 |
C18H16BrN3O3 | V = 5058.8 (17) Å3 |
Mr = 402.25 | Z = 12 |
Monoclinic, P21/c | Mo Kα radiation |
a = 15.023 (3) Å | µ = 2.46 mm−1 |
b = 13.860 (3) Å | T = 298 K |
c = 24.856 (4) Å | 0.13 × 0.10 × 0.07 mm |
β = 102.192 (2)° |
Bruker SMART CCD area-detector diffractometer | 8466 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 3662 reflections with I > 2σ(I) |
Tmin = 0.740, Tmax = 0.847 | Rint = 0.089 |
23383 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 24 restraints |
wR(F2) = 0.125 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.97 | Δρmax = 0.37 e Å−3 |
8466 reflections | Δρmin = −0.40 e Å−3 |
700 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 | ||
Br1 | −0.13842 (5) | 0.56908 (5) | −0.07512 (3) | 0.0692 (3) | |
Br2 | 0.45231 (5) | 0.10110 (5) | 0.56823 (3) | 0.0636 (2) | |
Br3 | 0.76185 (5) | 0.12527 (6) | 0.56406 (3) | 0.0737 (3) | |
O1 | 0.1220 (3) | 0.7483 (3) | 0.11481 (16) | 0.0553 (12) | |
H1 | 0.1607 | 0.7817 | 0.1049 | 0.083* | |
O2 | 0.0106 (3) | 0.6169 (3) | 0.13414 (16) | 0.0543 (12) | |
O3 | 0.3570 (3) | 1.0251 (3) | 0.05230 (17) | 0.0708 (14) | |
O4 | 0.1845 (3) | 0.2543 (3) | 0.37313 (15) | 0.0516 (11) | |
H4 | 0.1532 | 0.2979 | 0.3816 | 0.077* | |
O5 | 0.3003 (3) | 0.1246 (3) | 0.35743 (15) | 0.0529 (12) | |
O6 | −0.0514 (3) | 0.5403 (3) | 0.43114 (15) | 0.0500 (11) | |
O7 | 0.4976 (3) | 0.2696 (3) | 0.36521 (16) | 0.0627 (13) | |
H7 | 0.4652 | 0.3129 | 0.3729 | 0.094* | |
O8 | 0.6141 (3) | 0.1372 (3) | 0.35256 (17) | 0.0634 (13) | |
O9 | 0.2472 (3) | 0.5454 (3) | 0.41487 (16) | 0.0584 (13) | |
N1 | 0.1844 (3) | 0.8539 (3) | 0.0440 (2) | 0.0435 (14) | |
N2 | 0.2421 (4) | 0.9215 (4) | 0.0291 (2) | 0.0528 (15) | |
N3 | 0.4718 (5) | 1.0844 (7) | 0.2278 (3) | 0.094 (3) | |
N4 | 0.1192 (3) | 0.3660 (3) | 0.44138 (19) | 0.0381 (13) | |
N5 | 0.0606 (3) | 0.4335 (3) | 0.45502 (19) | 0.0395 (13) | |
N6 | −0.1466 (3) | 0.6116 (4) | 0.25086 (19) | 0.0441 (13) | |
N7 | 0.4287 (4) | 0.3826 (3) | 0.4301 (2) | 0.0470 (14) | |
N8 | 0.3669 (4) | 0.4477 (4) | 0.4423 (2) | 0.0488 (14) | |
N9 | 0.1693 (3) | 0.6162 (4) | 0.2334 (2) | 0.0485 (14) | |
C1 | 0.0654 (4) | 0.7401 (4) | 0.0170 (3) | 0.0388 (16) | |
C2 | 0.0651 (4) | 0.7112 (4) | 0.0700 (2) | 0.0357 (15) | |
C3 | 0.0035 (4) | 0.6407 (4) | 0.0800 (3) | 0.0425 (16) | |
C4 | −0.0565 (4) | 0.5993 (4) | 0.0363 (2) | 0.0419 (16) | |
H4A | −0.0972 | 0.5523 | 0.0426 | 0.050* | |
C5 | −0.0556 (4) | 0.6283 (4) | −0.0165 (2) | 0.0423 (16) | |
C6 | 0.0027 (4) | 0.6985 (4) | −0.0275 (2) | 0.0440 (16) | |
H6A | 0.0009 | 0.7182 | −0.0634 | 0.053* | |
C7 | 0.1276 (4) | 0.8133 (4) | 0.0048 (3) | 0.0451 (17) | |
H7A | 0.1263 | 0.8307 | −0.0315 | 0.054* | |
C8 | 0.3041 (5) | 0.9683 (5) | 0.0672 (3) | 0.0513 (19) | |
C9 | 0.3046 (5) | 0.9496 (4) | 0.1269 (3) | 0.067 (2) | |
H9A | 0.2424 | 0.9515 | 0.1320 | 0.080* | |
H9B | 0.3280 | 0.8852 | 0.1362 | 0.080* | |
C10 | 0.3597 (5) | 1.0191 (5) | 0.1653 (3) | 0.0482 (17) | |
C11 | 0.4412 (6) | 1.0053 (6) | 0.1978 (4) | 0.082 (3) | |
H11 | 0.4736 | 0.9477 | 0.1996 | 0.098* | |
C12 | 0.4076 (7) | 1.1530 (6) | 0.2146 (3) | 0.069 (2) | |
C13 | 0.4077 (7) | 1.2471 (7) | 0.2351 (3) | 0.106 (3) | |
H13 | 0.4569 | 1.2724 | 0.2602 | 0.128* | |
C14 | 0.3348 (9) | 1.2962 (7) | 0.2166 (4) | 0.117 (4) | |
H14 | 0.3336 | 1.3581 | 0.2309 | 0.141* | |
C15 | 0.2586 (7) | 1.2692 (7) | 0.1785 (4) | 0.107 (3) | |
H15 | 0.2095 | 1.3108 | 0.1677 | 0.129* | |
C16 | 0.2583 (6) | 1.1721 (6) | 0.1558 (3) | 0.077 (2) | |
H16 | 0.2095 | 1.1488 | 0.1296 | 0.093* | |
C17 | 0.3359 (5) | 1.1157 (5) | 0.1759 (3) | 0.0471 (17) | |
C18 | −0.0485 (4) | 0.5440 (4) | 0.1464 (2) | 0.0617 (19) | |
H18A | −0.1104 | 0.5603 | 0.1299 | 0.093* | |
H18B | −0.0419 | 0.5388 | 0.1855 | 0.093* | |
H18C | −0.0333 | 0.4834 | 0.1319 | 0.093* | |
C19 | 0.2422 (4) | 0.2557 (4) | 0.4718 (2) | 0.0341 (15) | |
C20 | 0.2423 (4) | 0.2217 (4) | 0.4187 (2) | 0.0352 (15) | |
C21 | 0.3056 (4) | 0.1522 (4) | 0.4109 (2) | 0.0408 (16) | |
C22 | 0.3683 (4) | 0.1168 (4) | 0.4554 (2) | 0.0394 (15) | |
H22 | 0.4110 | 0.0710 | 0.4503 | 0.047* | |
C23 | 0.3665 (4) | 0.1504 (4) | 0.5075 (2) | 0.0370 (15) | |
C24 | 0.3055 (4) | 0.2189 (4) | 0.5165 (2) | 0.0400 (16) | |
H24 | 0.3062 | 0.2406 | 0.5519 | 0.048* | |
C25 | 0.1756 (4) | 0.3268 (4) | 0.4806 (2) | 0.0377 (16) | |
H25 | 0.1741 | 0.3443 | 0.5165 | 0.045* | |
C26 | 0.0009 (4) | 0.4826 (4) | 0.4160 (2) | 0.0372 (16) | |
C27 | 0.0038 (4) | 0.4648 (4) | 0.3569 (2) | 0.0438 (16) | |
H27A | 0.0670 | 0.4630 | 0.3535 | 0.053* | |
H27B | −0.0225 | 0.4020 | 0.3463 | 0.053* | |
C28 | −0.0453 (4) | 0.5385 (4) | 0.3178 (2) | 0.0381 (16) | |
C29 | −0.1248 (5) | 0.5292 (4) | 0.2810 (3) | 0.0459 (17) | |
H29 | −0.1604 | 0.4737 | 0.2767 | 0.055* | |
C30 | −0.0782 (4) | 0.6774 (4) | 0.2689 (2) | 0.0362 (15) | |
C31 | −0.0676 (5) | 0.7714 (4) | 0.2514 (2) | 0.0493 (17) | |
H31 | −0.1119 | 0.8001 | 0.2244 | 0.059* | |
C32 | 0.0090 (5) | 0.8194 (4) | 0.2748 (3) | 0.058 (2) | |
H32 | 0.0181 | 0.8815 | 0.2629 | 0.070* | |
C33 | 0.0748 (5) | 0.7777 (5) | 0.3165 (3) | 0.0570 (19) | |
H33 | 0.1260 | 0.8134 | 0.3325 | 0.068* | |
C34 | 0.0656 (4) | 0.6847 (4) | 0.3345 (2) | 0.0441 (17) | |
H34 | 0.1103 | 0.6566 | 0.3615 | 0.053* | |
C35 | −0.0130 (4) | 0.6344 (4) | 0.3106 (2) | 0.0331 (15) | |
C36 | 0.3667 (4) | 0.0585 (4) | 0.3462 (2) | 0.0610 (19) | |
H36A | 0.4263 | 0.0857 | 0.3581 | 0.091* | |
H36B | 0.3556 | 0.0460 | 0.3073 | 0.091* | |
H36C | 0.3628 | −0.0008 | 0.3655 | 0.091* | |
C37 | 0.5529 (4) | 0.2773 (4) | 0.4631 (3) | 0.0392 (16) | |
C38 | 0.5555 (4) | 0.2401 (5) | 0.4113 (3) | 0.0473 (17) | |
C39 | 0.6188 (4) | 0.1688 (4) | 0.4054 (3) | 0.0479 (17) | |
C40 | 0.6801 (4) | 0.1356 (4) | 0.4512 (3) | 0.0517 (18) | |
H40 | 0.7223 | 0.0882 | 0.4476 | 0.062* | |
C41 | 0.6779 (4) | 0.1733 (4) | 0.5021 (3) | 0.0468 (17) | |
C42 | 0.6149 (4) | 0.2428 (4) | 0.5089 (3) | 0.0478 (17) | |
H42 | 0.6140 | 0.2663 | 0.5439 | 0.057* | |
C43 | 0.4858 (4) | 0.3477 (4) | 0.4714 (3) | 0.0487 (18) | |
H43 | 0.4841 | 0.3678 | 0.5069 | 0.058* | |
C44 | 0.3035 (5) | 0.4900 (4) | 0.4022 (3) | 0.0478 (18) | |
C45 | 0.3064 (4) | 0.4670 (4) | 0.3435 (2) | 0.0585 (19) | |
H45A | 0.3695 | 0.4600 | 0.3406 | 0.070* | |
H45B | 0.2765 | 0.4055 | 0.3337 | 0.070* | |
C46 | 0.2620 (5) | 0.5416 (4) | 0.3027 (3) | 0.0456 (17) | |
C47 | 0.1861 (5) | 0.5327 (5) | 0.2626 (3) | 0.0521 (18) | |
H47 | 0.1505 | 0.4773 | 0.2559 | 0.063* | |
C48 | 0.2355 (4) | 0.6824 (5) | 0.2549 (3) | 0.0413 (16) | |
C49 | 0.2486 (5) | 0.7766 (5) | 0.2387 (3) | 0.060 (2) | |
H49 | 0.2088 | 0.8058 | 0.2095 | 0.072* | |
C50 | 0.3221 (6) | 0.8232 (5) | 0.2678 (3) | 0.072 (2) | |
H50 | 0.3324 | 0.8863 | 0.2579 | 0.087* | |
C51 | 0.3831 (5) | 0.7821 (6) | 0.3117 (3) | 0.077 (2) | |
H51 | 0.4327 | 0.8173 | 0.3305 | 0.093* | |
C52 | 0.3694 (5) | 0.6884 (5) | 0.3271 (3) | 0.065 (2) | |
H52 | 0.4100 | 0.6599 | 0.3562 | 0.078* | |
C53 | 0.2944 (4) | 0.6371 (4) | 0.2989 (3) | 0.0413 (16) | |
C54 | 0.6771 (4) | 0.0682 (4) | 0.3442 (2) | 0.064 (2) | |
H54A | 0.7375 | 0.0941 | 0.3550 | 0.096* | |
H54B | 0.6655 | 0.0508 | 0.3059 | 0.096* | |
H54C | 0.6717 | 0.0120 | 0.3659 | 0.096* | |
H8 | 0.363 (4) | 0.456 (4) | 0.4777 (8) | 0.080* | |
H5 | 0.060 (4) | 0.437 (4) | 0.4910 (7) | 0.080* | |
H2 | 0.240 (4) | 0.924 (4) | −0.0074 (7) | 0.080* | |
H6 | −0.196 (2) | 0.622 (4) | 0.2240 (17) | 0.080* | |
H9 | 0.119 (2) | 0.620 (4) | 0.2067 (17) | 0.080* | |
H3 | 0.5281 (18) | 1.084 (4) | 0.249 (2) | 0.080* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br1 | 0.0570 (5) | 0.0826 (5) | 0.0592 (5) | −0.0098 (4) | −0.0077 (4) | −0.0082 (4) |
Br2 | 0.0562 (5) | 0.0761 (5) | 0.0501 (4) | 0.0204 (4) | −0.0076 (4) | 0.0116 (4) |
Br3 | 0.0615 (5) | 0.0934 (6) | 0.0574 (5) | 0.0157 (5) | −0.0074 (4) | 0.0110 (4) |
O1 | 0.066 (3) | 0.062 (3) | 0.038 (3) | −0.019 (3) | 0.010 (2) | −0.003 (2) |
O2 | 0.065 (3) | 0.054 (3) | 0.043 (3) | −0.021 (2) | 0.009 (2) | 0.010 (2) |
O3 | 0.099 (4) | 0.069 (3) | 0.050 (3) | −0.045 (3) | 0.027 (3) | −0.007 (2) |
O4 | 0.057 (3) | 0.059 (3) | 0.037 (3) | 0.025 (2) | 0.006 (2) | 0.002 (2) |
O5 | 0.050 (3) | 0.069 (3) | 0.037 (3) | 0.024 (2) | 0.003 (2) | −0.011 (2) |
O6 | 0.061 (3) | 0.051 (3) | 0.040 (3) | 0.031 (2) | 0.016 (2) | 0.006 (2) |
O7 | 0.063 (3) | 0.077 (4) | 0.046 (3) | 0.035 (3) | 0.008 (3) | 0.011 (3) |
O8 | 0.061 (3) | 0.082 (3) | 0.046 (3) | 0.036 (3) | 0.009 (3) | 0.000 (3) |
O9 | 0.068 (3) | 0.060 (3) | 0.051 (3) | 0.032 (3) | 0.020 (3) | 0.011 (2) |
N1 | 0.049 (4) | 0.035 (3) | 0.052 (4) | −0.009 (3) | 0.022 (3) | 0.001 (3) |
N2 | 0.059 (4) | 0.052 (4) | 0.052 (4) | −0.014 (3) | 0.022 (4) | −0.003 (3) |
N3 | 0.044 (5) | 0.146 (8) | 0.076 (6) | −0.031 (6) | −0.023 (4) | 0.032 (5) |
N4 | 0.037 (3) | 0.028 (3) | 0.050 (3) | 0.014 (3) | 0.011 (3) | 0.007 (3) |
N5 | 0.046 (3) | 0.040 (3) | 0.032 (3) | 0.015 (3) | 0.007 (3) | 0.003 (3) |
N6 | 0.043 (4) | 0.045 (3) | 0.036 (3) | 0.005 (3) | −0.009 (3) | −0.004 (3) |
N7 | 0.055 (4) | 0.041 (3) | 0.050 (4) | 0.011 (3) | 0.022 (3) | 0.004 (3) |
N8 | 0.059 (4) | 0.049 (3) | 0.044 (4) | 0.016 (3) | 0.022 (3) | 0.006 (3) |
N9 | 0.049 (4) | 0.051 (4) | 0.042 (4) | −0.003 (4) | 0.001 (3) | −0.002 (3) |
C1 | 0.040 (4) | 0.036 (4) | 0.043 (4) | 0.004 (3) | 0.016 (4) | 0.001 (3) |
C2 | 0.045 (4) | 0.030 (4) | 0.032 (4) | −0.001 (3) | 0.008 (4) | −0.001 (3) |
C3 | 0.047 (4) | 0.039 (4) | 0.045 (4) | 0.001 (4) | 0.017 (4) | 0.008 (3) |
C4 | 0.038 (4) | 0.038 (4) | 0.046 (4) | −0.006 (3) | 0.001 (4) | 0.004 (3) |
C5 | 0.042 (4) | 0.047 (4) | 0.035 (4) | 0.001 (3) | 0.000 (3) | −0.009 (3) |
C6 | 0.050 (4) | 0.046 (4) | 0.035 (4) | 0.001 (4) | 0.006 (4) | 0.003 (3) |
C7 | 0.060 (5) | 0.039 (4) | 0.039 (4) | −0.001 (4) | 0.016 (4) | 0.000 (3) |
C8 | 0.074 (6) | 0.037 (4) | 0.048 (5) | −0.008 (4) | 0.023 (4) | −0.003 (4) |
C9 | 0.096 (6) | 0.058 (5) | 0.053 (5) | −0.027 (4) | 0.032 (4) | −0.013 (4) |
C10 | 0.047 (5) | 0.056 (5) | 0.042 (4) | −0.008 (4) | 0.010 (4) | 0.002 (4) |
C11 | 0.066 (7) | 0.086 (7) | 0.093 (7) | −0.001 (6) | 0.020 (6) | 0.033 (6) |
C12 | 0.089 (7) | 0.065 (6) | 0.049 (5) | −0.037 (5) | 0.010 (5) | −0.005 (5) |
C13 | 0.147 (7) | 0.111 (7) | 0.063 (5) | −0.048 (6) | 0.026 (5) | −0.012 (5) |
C14 | 0.178 (8) | 0.083 (6) | 0.107 (7) | −0.011 (6) | 0.070 (7) | −0.010 (5) |
C15 | 0.126 (7) | 0.103 (6) | 0.107 (7) | 0.042 (6) | 0.056 (6) | 0.057 (6) |
C16 | 0.092 (7) | 0.095 (7) | 0.047 (5) | 0.004 (6) | 0.022 (5) | 0.034 (5) |
C17 | 0.058 (5) | 0.048 (5) | 0.035 (4) | −0.016 (4) | 0.008 (4) | 0.003 (4) |
C18 | 0.072 (5) | 0.060 (4) | 0.058 (5) | −0.012 (4) | 0.024 (4) | 0.020 (4) |
C19 | 0.040 (4) | 0.030 (3) | 0.032 (4) | 0.002 (3) | 0.007 (3) | 0.002 (3) |
C20 | 0.039 (4) | 0.031 (4) | 0.034 (4) | 0.016 (3) | 0.003 (4) | 0.011 (3) |
C21 | 0.041 (4) | 0.048 (4) | 0.030 (4) | 0.004 (3) | 0.000 (3) | −0.004 (3) |
C22 | 0.035 (4) | 0.037 (4) | 0.045 (4) | 0.008 (3) | 0.007 (3) | −0.005 (3) |
C23 | 0.032 (4) | 0.036 (4) | 0.042 (4) | 0.006 (3) | 0.003 (3) | 0.001 (3) |
C24 | 0.048 (4) | 0.039 (4) | 0.031 (4) | 0.005 (3) | 0.005 (3) | 0.006 (3) |
C25 | 0.038 (4) | 0.038 (4) | 0.035 (4) | 0.002 (3) | 0.006 (3) | 0.002 (3) |
C26 | 0.049 (4) | 0.028 (4) | 0.036 (4) | 0.009 (3) | 0.011 (4) | 0.005 (3) |
C27 | 0.058 (4) | 0.034 (4) | 0.041 (4) | 0.013 (3) | 0.013 (4) | 0.006 (3) |
C28 | 0.041 (4) | 0.042 (4) | 0.031 (4) | 0.013 (4) | 0.008 (3) | −0.004 (3) |
C29 | 0.062 (5) | 0.029 (4) | 0.047 (4) | 0.002 (4) | 0.011 (4) | −0.001 (3) |
C30 | 0.053 (5) | 0.033 (4) | 0.021 (4) | 0.001 (3) | 0.002 (3) | 0.000 (3) |
C31 | 0.067 (5) | 0.040 (4) | 0.035 (4) | 0.004 (4) | −0.001 (4) | 0.006 (3) |
C32 | 0.086 (6) | 0.038 (4) | 0.049 (5) | −0.004 (4) | 0.012 (5) | −0.001 (4) |
C33 | 0.064 (5) | 0.055 (5) | 0.051 (5) | −0.018 (4) | 0.010 (4) | −0.017 (4) |
C34 | 0.039 (4) | 0.057 (5) | 0.030 (4) | 0.004 (4) | −0.006 (3) | −0.009 (3) |
C35 | 0.044 (4) | 0.032 (4) | 0.021 (4) | 0.004 (3) | 0.003 (3) | −0.009 (3) |
C36 | 0.060 (5) | 0.070 (5) | 0.054 (5) | 0.018 (4) | 0.014 (4) | −0.019 (4) |
C37 | 0.029 (4) | 0.045 (4) | 0.041 (4) | 0.006 (3) | 0.003 (3) | 0.009 (3) |
C38 | 0.039 (4) | 0.058 (5) | 0.043 (5) | 0.006 (4) | 0.004 (4) | 0.009 (4) |
C39 | 0.040 (4) | 0.060 (5) | 0.043 (5) | 0.004 (4) | 0.009 (4) | 0.007 (4) |
C40 | 0.045 (4) | 0.055 (4) | 0.055 (5) | 0.012 (4) | 0.011 (4) | 0.005 (4) |
C41 | 0.034 (4) | 0.054 (4) | 0.047 (5) | 0.003 (4) | −0.005 (4) | 0.014 (4) |
C42 | 0.047 (5) | 0.055 (4) | 0.042 (4) | −0.004 (4) | 0.011 (4) | −0.004 (4) |
C43 | 0.051 (5) | 0.047 (4) | 0.052 (5) | 0.005 (4) | 0.023 (4) | 0.004 (4) |
C44 | 0.050 (5) | 0.039 (4) | 0.056 (5) | 0.007 (4) | 0.015 (4) | 0.014 (4) |
C45 | 0.078 (5) | 0.051 (4) | 0.050 (5) | 0.024 (4) | 0.022 (4) | 0.012 (4) |
C46 | 0.061 (5) | 0.042 (4) | 0.038 (4) | 0.009 (4) | 0.019 (4) | 0.003 (4) |
C47 | 0.060 (5) | 0.038 (4) | 0.060 (5) | −0.007 (4) | 0.017 (4) | −0.003 (4) |
C48 | 0.046 (5) | 0.044 (4) | 0.034 (4) | 0.005 (4) | 0.010 (4) | −0.002 (4) |
C49 | 0.091 (6) | 0.041 (5) | 0.047 (5) | 0.008 (4) | 0.013 (5) | 0.004 (4) |
C50 | 0.109 (7) | 0.057 (5) | 0.054 (6) | −0.019 (5) | 0.024 (5) | −0.019 (5) |
C51 | 0.094 (7) | 0.079 (6) | 0.054 (5) | −0.028 (5) | 0.002 (5) | −0.029 (5) |
C52 | 0.071 (6) | 0.064 (5) | 0.056 (5) | −0.002 (5) | 0.005 (4) | −0.006 (4) |
C53 | 0.045 (5) | 0.039 (4) | 0.040 (4) | 0.001 (4) | 0.009 (4) | −0.005 (3) |
C54 | 0.062 (5) | 0.079 (5) | 0.056 (5) | 0.021 (4) | 0.022 (4) | 0.001 (4) |
Br1—C5 | 1.892 (6) | C16—H16 | 0.9300 |
Br2—C23 | 1.893 (5) | C18—H18A | 0.9600 |
Br3—C41 | 1.894 (6) | C18—H18B | 0.9600 |
O1—C2 | 1.354 (6) | C18—H18C | 0.9600 |
O1—H1 | 0.8200 | C19—C24 | 1.396 (7) |
O2—C3 | 1.368 (6) | C19—C20 | 1.402 (7) |
O2—C18 | 1.421 (6) | C19—C25 | 1.454 (7) |
O3—C8 | 1.231 (6) | C20—C21 | 1.397 (7) |
O4—C20 | 1.350 (6) | C21—C22 | 1.382 (7) |
O4—H4 | 0.8200 | C22—C23 | 1.382 (7) |
O5—C21 | 1.369 (6) | C22—H22 | 0.9300 |
O5—C36 | 1.425 (6) | C23—C24 | 1.370 (7) |
O6—C26 | 1.234 (6) | C24—H24 | 0.9300 |
O7—C38 | 1.346 (6) | C25—H25 | 0.9300 |
O7—H7 | 0.8200 | C26—C27 | 1.500 (7) |
O8—C39 | 1.371 (7) | C27—C28 | 1.493 (7) |
O8—C54 | 1.392 (6) | C27—H27A | 0.9700 |
O9—C44 | 1.230 (6) | C27—H27B | 0.9700 |
N1—C7 | 1.281 (6) | C28—C29 | 1.348 (7) |
N1—N2 | 1.380 (6) | C28—C35 | 1.439 (7) |
N2—C8 | 1.346 (7) | C29—H29 | 0.9300 |
N2—H2 | 0.901 (10) | C30—C31 | 1.393 (7) |
N3—C12 | 1.344 (9) | C30—C35 | 1.400 (7) |
N3—C11 | 1.352 (9) | C31—C32 | 1.349 (7) |
N3—H3 | 0.896 (10) | C31—H31 | 0.9300 |
N4—C25 | 1.271 (6) | C32—C33 | 1.398 (8) |
N4—N5 | 1.376 (6) | C32—H32 | 0.9300 |
N5—C26 | 1.356 (6) | C33—C34 | 1.381 (7) |
N5—H5 | 0.898 (10) | C33—H33 | 0.9300 |
N6—C29 | 1.367 (7) | C34—C35 | 1.391 (7) |
N6—C30 | 1.376 (7) | C34—H34 | 0.9300 |
N6—H6 | 0.900 (10) | C36—H36A | 0.9600 |
N7—C43 | 1.285 (7) | C36—H36B | 0.9600 |
N7—N8 | 1.373 (6) | C36—H36C | 0.9600 |
N8—C44 | 1.357 (7) | C37—C42 | 1.394 (7) |
N8—H8 | 0.902 (10) | C37—C38 | 1.397 (8) |
N9—C47 | 1.361 (7) | C37—C43 | 1.448 (7) |
N9—C48 | 1.376 (7) | C38—C39 | 1.401 (7) |
N9—H9 | 0.894 (10) | C39—C40 | 1.383 (7) |
C1—C2 | 1.380 (7) | C40—C41 | 1.376 (8) |
C1—C6 | 1.415 (7) | C40—H40 | 0.9300 |
C1—C7 | 1.454 (7) | C41—C42 | 1.386 (7) |
C2—C3 | 1.403 (7) | C42—H42 | 0.9300 |
C3—C4 | 1.381 (7) | C43—H43 | 0.9300 |
C4—C5 | 1.377 (7) | C44—C45 | 1.505 (8) |
C4—H4A | 0.9300 | C45—C46 | 1.502 (7) |
C5—C6 | 1.373 (7) | C45—H45A | 0.9700 |
C6—H6A | 0.9300 | C45—H45B | 0.9700 |
C7—H7A | 0.9300 | C46—C47 | 1.352 (7) |
C8—C9 | 1.504 (8) | C46—C53 | 1.420 (8) |
C9—C10 | 1.479 (8) | C47—H47 | 0.9300 |
C9—H9A | 0.9700 | C48—C49 | 1.393 (8) |
C9—H9B | 0.9700 | C48—C53 | 1.401 (7) |
C10—C11 | 1.331 (9) | C49—C50 | 1.350 (8) |
C10—C17 | 1.425 (8) | C49—H49 | 0.9300 |
C11—H11 | 0.9300 | C50—C51 | 1.390 (9) |
C12—C17 | 1.383 (9) | C50—H50 | 0.9300 |
C12—C13 | 1.401 (10) | C51—C52 | 1.381 (8) |
C13—C14 | 1.289 (11) | C51—H51 | 0.9300 |
C13—H13 | 0.9300 | C52—C53 | 1.391 (8) |
C14—C15 | 1.375 (11) | C52—H52 | 0.9300 |
C14—H14 | 0.9300 | C54—H54A | 0.9600 |
C15—C16 | 1.458 (10) | C54—H54B | 0.9600 |
C15—H15 | 0.9300 | C54—H54C | 0.9600 |
C16—C17 | 1.405 (8) | ||
C2—O1—H1 | 109.5 | C19—C24—H24 | 120.3 |
C3—O2—C18 | 117.4 (5) | N4—C25—C19 | 122.8 (6) |
C20—O4—H4 | 109.5 | N4—C25—H25 | 118.6 |
C21—O5—C36 | 118.0 (4) | C19—C25—H25 | 118.6 |
C38—O7—H7 | 109.5 | O6—C26—N5 | 118.3 (5) |
C39—O8—C54 | 117.6 (5) | O6—C26—C27 | 123.8 (6) |
C7—N1—N2 | 116.6 (5) | N5—C26—C27 | 117.8 (5) |
C8—N2—N1 | 121.2 (5) | C28—C27—C26 | 114.4 (5) |
C8—N2—H2 | 124 (4) | C28—C27—H27A | 108.7 |
N1—N2—H2 | 114 (4) | C26—C27—H27A | 108.7 |
C12—N3—C11 | 107.2 (7) | C28—C27—H27B | 108.7 |
C12—N3—H3 | 134 (4) | C26—C27—H27B | 108.7 |
C11—N3—H3 | 119 (4) | H27A—C27—H27B | 107.6 |
C25—N4—N5 | 117.3 (5) | C29—C28—C35 | 106.1 (6) |
C26—N5—N4 | 121.7 (5) | C29—C28—C27 | 128.4 (6) |
C26—N5—H5 | 122 (4) | C35—C28—C27 | 125.4 (6) |
N4—N5—H5 | 115 (4) | C28—C29—N6 | 111.6 (6) |
C29—N6—C30 | 107.3 (5) | C28—C29—H29 | 124.2 |
C29—N6—H6 | 128 (4) | N6—C29—H29 | 124.2 |
C30—N6—H6 | 125 (4) | N6—C30—C31 | 130.1 (6) |
C43—N7—N8 | 116.1 (5) | N6—C30—C35 | 108.5 (5) |
C44—N8—N7 | 121.7 (5) | C31—C30—C35 | 121.4 (6) |
C44—N8—H8 | 119 (4) | C32—C31—C30 | 118.1 (6) |
N7—N8—H8 | 119 (4) | C32—C31—H31 | 121.0 |
C47—N9—C48 | 108.8 (5) | C30—C31—H31 | 121.0 |
C47—N9—H9 | 118 (4) | C31—C32—C33 | 121.4 (6) |
C48—N9—H9 | 133 (4) | C31—C32—H32 | 119.3 |
C2—C1—C6 | 119.4 (5) | C33—C32—H32 | 119.3 |
C2—C1—C7 | 122.3 (6) | C34—C33—C32 | 121.5 (6) |
C6—C1—C7 | 118.3 (6) | C34—C33—H33 | 119.3 |
O1—C2—C1 | 123.1 (5) | C32—C33—H33 | 119.3 |
O1—C2—C3 | 116.4 (5) | C33—C34—C35 | 117.6 (6) |
C1—C2—C3 | 120.4 (6) | C33—C34—H34 | 121.2 |
O2—C3—C4 | 125.1 (5) | C35—C34—H34 | 121.2 |
O2—C3—C2 | 115.1 (6) | C34—C35—C30 | 120.0 (5) |
C4—C3—C2 | 119.8 (6) | C34—C35—C28 | 133.4 (6) |
C5—C4—C3 | 119.5 (5) | C30—C35—C28 | 106.5 (5) |
C5—C4—H4A | 120.3 | O5—C36—H36A | 109.5 |
C3—C4—H4A | 120.3 | O5—C36—H36B | 109.5 |
C6—C5—C4 | 122.1 (6) | H36A—C36—H36B | 109.5 |
C6—C5—Br1 | 119.8 (5) | O5—C36—H36C | 109.5 |
C4—C5—Br1 | 118.1 (5) | H36A—C36—H36C | 109.5 |
C5—C6—C1 | 118.8 (6) | H36B—C36—H36C | 109.5 |
C5—C6—H6A | 120.6 | C42—C37—C38 | 118.9 (6) |
C1—C6—H6A | 120.6 | C42—C37—C43 | 118.7 (6) |
N1—C7—C1 | 120.1 (6) | C38—C37—C43 | 122.4 (6) |
N1—C7—H7A | 120.0 | O7—C38—C37 | 122.3 (6) |
C1—C7—H7A | 120.0 | O7—C38—C39 | 117.1 (6) |
O3—C8—N2 | 119.4 (6) | C37—C38—C39 | 120.6 (6) |
O3—C8—C9 | 122.5 (7) | O8—C39—C40 | 124.9 (6) |
N2—C8—C9 | 118.1 (6) | O8—C39—C38 | 115.2 (6) |
C10—C9—C8 | 114.3 (5) | C40—C39—C38 | 119.8 (6) |
C10—C9—H9A | 108.7 | C41—C40—C39 | 119.3 (6) |
C8—C9—H9A | 108.7 | C41—C40—H40 | 120.3 |
C10—C9—H9B | 108.7 | C39—C40—H40 | 120.3 |
C8—C9—H9B | 108.7 | C40—C41—C42 | 121.8 (6) |
H9A—C9—H9B | 107.6 | C40—C41—Br3 | 118.3 (5) |
C11—C10—C17 | 104.9 (7) | C42—C41—Br3 | 119.9 (5) |
C11—C10—C9 | 128.0 (8) | C41—C42—C37 | 119.6 (6) |
C17—C10—C9 | 127.1 (7) | C41—C42—H42 | 120.2 |
C10—C11—N3 | 112.3 (8) | C37—C42—H42 | 120.2 |
C10—C11—H11 | 123.8 | N7—C43—C37 | 120.5 (6) |
N3—C11—H11 | 123.8 | N7—C43—H43 | 119.7 |
N3—C12—C17 | 108.6 (7) | C37—C43—H43 | 119.7 |
N3—C12—C13 | 128.6 (10) | O9—C44—N8 | 119.8 (6) |
C17—C12—C13 | 122.8 (9) | O9—C44—C45 | 122.8 (6) |
C14—C13—C12 | 115.3 (10) | N8—C44—C45 | 117.4 (6) |
C14—C13—H13 | 122.4 | C46—C45—C44 | 114.1 (5) |
C12—C13—H13 | 122.4 | C46—C45—H45A | 108.7 |
C13—C14—C15 | 128.5 (11) | C44—C45—H45A | 108.7 |
C13—C14—H14 | 115.7 | C46—C45—H45B | 108.7 |
C15—C14—H14 | 115.7 | C44—C45—H45B | 108.7 |
C14—C15—C16 | 116.9 (9) | H45A—C45—H45B | 107.6 |
C14—C15—H15 | 121.6 | C47—C46—C53 | 106.4 (6) |
C16—C15—H15 | 121.6 | C47—C46—C45 | 128.3 (6) |
C17—C16—C15 | 116.2 (8) | C53—C46—C45 | 125.3 (7) |
C17—C16—H16 | 121.9 | C46—C47—N9 | 110.4 (6) |
C15—C16—H16 | 121.9 | C46—C47—H47 | 124.8 |
C12—C17—C16 | 120.3 (7) | N9—C47—H47 | 124.8 |
C12—C17—C10 | 106.9 (7) | N9—C48—C49 | 130.4 (7) |
C16—C17—C10 | 132.8 (7) | N9—C48—C53 | 106.8 (5) |
O2—C18—H18A | 109.5 | C49—C48—C53 | 122.8 (7) |
O2—C18—H18B | 109.5 | C50—C49—C48 | 116.3 (7) |
H18A—C18—H18B | 109.5 | C50—C49—H49 | 121.9 |
O2—C18—H18C | 109.5 | C48—C49—H49 | 121.9 |
H18A—C18—H18C | 109.5 | C49—C50—C51 | 123.6 (7) |
H18B—C18—H18C | 109.5 | C49—C50—H50 | 118.2 |
C24—C19—C20 | 119.4 (5) | C51—C50—H50 | 118.2 |
C24—C19—C25 | 120.2 (5) | C52—C51—C50 | 119.4 (7) |
C20—C19—C25 | 120.5 (5) | C52—C51—H51 | 120.3 |
O4—C20—C21 | 116.7 (5) | C50—C51—H51 | 120.3 |
O4—C20—C19 | 123.3 (5) | C51—C52—C53 | 119.6 (7) |
C21—C20—C19 | 119.9 (5) | C51—C52—H52 | 120.2 |
O5—C21—C22 | 124.7 (5) | C53—C52—H52 | 120.2 |
O5—C21—C20 | 115.2 (5) | C52—C53—C48 | 118.4 (6) |
C22—C21—C20 | 120.1 (6) | C52—C53—C46 | 134.1 (7) |
C21—C22—C23 | 119.1 (5) | C48—C53—C46 | 107.5 (6) |
C21—C22—H22 | 120.4 | O8—C54—H54A | 109.5 |
C23—C22—H22 | 120.4 | O8—C54—H54B | 109.5 |
C24—C23—C22 | 122.1 (5) | H54A—C54—H54B | 109.5 |
C24—C23—Br2 | 119.2 (5) | O8—C54—H54C | 109.5 |
C22—C23—Br2 | 118.8 (4) | H54A—C54—H54C | 109.5 |
C23—C24—C19 | 119.4 (6) | H54B—C54—H54C | 109.5 |
C23—C24—H24 | 120.3 |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3···O8i | 0.90 (1) | 2.73 (4) | 3.453 (8) | 138 (5) |
N9—H9···O2 | 0.89 (1) | 2.16 (2) | 3.048 (6) | 171 (6) |
N6—H6···O5ii | 0.90 (1) | 2.28 (2) | 3.159 (6) | 165 (5) |
N2—H2···O9iii | 0.90 (1) | 2.01 (2) | 2.893 (6) | 168 (6) |
N5—H5···O6iv | 0.90 (1) | 1.99 (1) | 2.885 (6) | 174 (5) |
N8—H8···O3v | 0.90 (1) | 1.89 (1) | 2.795 (6) | 179 (6) |
O7—H7···N7 | 0.82 | 1.90 | 2.615 (6) | 146 |
O4—H4···N4 | 0.82 | 1.92 | 2.634 (6) | 145 |
O1—H1···N1 | 0.82 | 1.91 | 2.610 (6) | 143 |
Symmetry codes: (i) x, y+1, z; (ii) −x, y+1/2, −z+1/2; (iii) x, −y+3/2, z−1/2; (iv) −x, −y+1, −z+1; (v) x, −y+3/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C18H16BrN3O3 |
Mr | 402.25 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 298 |
a, b, c (Å) | 15.023 (3), 13.860 (3), 24.856 (4) |
β (°) | 102.192 (2) |
V (Å3) | 5058.8 (17) |
Z | 12 |
Radiation type | Mo Kα |
µ (mm−1) | 2.46 |
Crystal size (mm) | 0.13 × 0.10 × 0.07 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.740, 0.847 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 23383, 8466, 3662 |
Rint | 0.089 |
(sin θ/λ)max (Å−1) | 0.596 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.125, 0.97 |
No. of reflections | 8466 |
No. of parameters | 700 |
No. of restraints | 24 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.37, −0.40 |
Computer programs: SMART (Bruker, 1998), SAINT (Bruker, 1998), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3···O8i | 0.896 (10) | 2.73 (4) | 3.453 (8) | 138 (5) |
N9—H9···O2 | 0.894 (10) | 2.162 (16) | 3.048 (6) | 171 (6) |
N6—H6···O5ii | 0.900 (10) | 2.28 (2) | 3.159 (6) | 165 (5) |
N2—H2···O9iii | 0.901 (10) | 2.005 (17) | 2.893 (6) | 168 (6) |
N5—H5···O6iv | 0.898 (10) | 1.991 (13) | 2.885 (6) | 174 (5) |
N8—H8···O3v | 0.902 (10) | 1.893 (12) | 2.795 (6) | 179 (6) |
O7—H7···N7 | 0.82 | 1.90 | 2.615 (6) | 145.9 |
O4—H4···N4 | 0.82 | 1.92 | 2.634 (6) | 145.3 |
O1—H1···N1 | 0.82 | 1.91 | 2.610 (6) | 142.6 |
Symmetry codes: (i) x, y+1, z; (ii) −x, y+1/2, −z+1/2; (iii) x, −y+3/2, z−1/2; (iv) −x, −y+1, −z+1; (v) x, −y+3/2, z+1/2. |
Acknowledgements
The author is grateful to the Zibo Vocational Institute for supporting this work.
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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.
In the last few years, hydrazones have attracted much attention for their syntheses and crystal structures (Hashemian et al., 2011; Lei, 2011; Shalash et al., 2010). As a continuation of our work on such compounds (Li, 2011a,b), the author reports herein on the crystal structure of the new title hydrazone compound.
In the asymmetric unit of the title compound there are three (A, B and C) independent molecules (Fig. 1). The bond distances and angles are comparable to those observed in similar compounds (Li, 2011a,b). The dihedral angles between the indole ring and the benzene ring in the three molecules are 76.9 (2), 175.1 (2), and 70.9 (2)° for molecules A, B and C, respectively. All the molecules exist in the trans configuration with respect to the methylidene units. In each molecule there is an O—H···N intramolecular hydrogen bond (Table 1).