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Acta Cryst. (2008). E64, o1053    [ doi:10.1107/S160053680800812X ]

(E)-4-[(4-Amino-5-bromopyridin-3-yl)iminomethyl]phenol

M. Cai, M. Zhang and Y. Hu

Abstract top

In the molecule of the title compound, C12H10BrN3O, the pyridine and benzene rings are oriented at a dihedral angle of 34.93 (3)°. Intramolecular N-H...N and N-H...Br hydrogen bonds result in the formation of two non-planar five-membered rings. In the crystal structure, intermolecular O-H...N and N-H...O hydrogen bonds link the molecules to form a three-dimensional network.

Comment top

Schiff bases, as substrates, are important organic intermediates. Their recent applications in asymmetric catalytic hydrogenation, asymmetric chemical reduction and oxidation and asymmetric alkylidation of carbon atom, as well as reactions with Lawessen regent are very active (Liu et al., 2002). We have recently synthesized the novel title compound, (I), and report herein its crystal structure.

In the molecule of the title compound, (I), (Fig. 1) the bond lengths and angles are within normal ranges. Rings A (N1/C1–C5) and B (C7–C12) are, of course, planar and the dihedral angle between them is A/B = 34.93 (3)°. The intramolecular N—H···N and N—H···Br hydrogen bonds (Table 1) result in the formation of two non-planar five-membered rings; C (N2/C4/C5/N3/H3B) and D (Br1/C1/C5/N3/H3A).

In the crystal structure, intermolecular O—H···N and N—H···O hydrogen bonds (Table 1) link the molecules to form a three-dimensional network (Fig. 2), in which they may be effective in the stabilization of the structure.

Related literature top

For general background, see: Liu et al. (2002).

Experimental top

5-bromopyridine-3,4-diamine (1.88 g, 10 mmol) was added to a solution of 4-hydroxybenzaldehyde (1.22 g, 10 mmol)in MeOH (50 ml). The solution was refluxed for 10 h, and then dried over magnesium sulfate, filtered and the volatiles were removed under reduced pressure. The crude product was further purified and recystallized from MeOH affording yellow crystals of (I) (yield; 70%).

Refinement top

H atoms (for NH2) were located in a difference synthesis and refined isotropically [N—H = 0.876 (10) and 0.889 (10) Å; Uiso(H) = 0.028 (8) and 0.027 (8) Å2]. The remaining H atoms were positioned geometrically, with O—H = 0.82 Å (for OH) and C—H = 0.93 Å for aromatic H, respectively, and constrained to ride on their parent atoms with Uiso(H) = xUeq(C,O), where x = 1.5 for OH H and x = 1.2 for aromatic H atoms.

Computing details top

Data collection: CrystalClear (Rigaku/MSC, 2005); cell refinement: CrystalClear (Rigaku/MSC, 2005); data reduction: CrystalClear (Rigaku/MSC, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Bruker, 1997); software used to prepare material for publication: SHELXTL (Bruker, 1997) and PLATON (Spek, 2003).

Figures top
[Figure 1] Fig. 1. The molecular structure of the title molecule, with the atom-numbering scheme. Displacement ellipsoids are drawn at the 35% probability level.
[Figure 2] Fig. 2. A partial packing diagram of (I). Hydrogen bonds are shown as dashed lines.
(E)-4-[(4-amino-5-bromopyridin-3-yl)iminomethyl]phenol top
Crystal data top
C12H10BrN3OF000 = 584
Mr = 292.14Dx = 1.692 Mg m−3
Monoclinic, P21/nMo Kα radiation
λ = 0.71073 Å
Hall symbol: -P 2ynCell parameters from 3259 reflections
a = 4.9607 (10) Åθ = 1.9–27.8º
b = 15.586 (3) ŵ = 3.57 mm−1
c = 14.906 (3) ÅT = 113 (2) K
β = 95.65 (3)ºPlate, yellow
V = 1146.9 (4) Å30.10 × 0.08 × 0.06 mm
Z = 4
Data collection top
Rigaku Saturn
diffractometer		2739 independent reflections
Radiation source: rotating anode2123 reflections with I > 2σ(I)
Monochromator: confocalRint = 0.053
T = 113(2) Kθmax = 27.9º
ω scansθmin = 2.6º
Absorption correction: multi-scan
(Blessing, 1995)		h = −6→6
Tmin = 0.717, Tmax = 0.814k = −20→20
14191 measured reflectionsl = −19→19
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.040H atoms treated by a mixture of
independent and constrained refinement
wR(F2) = 0.100  w = 1/[σ2(Fo2) + (0.0558P)2 + 0.0115P]
where P = (Fo2 + 2Fc2)/3
S = 1.02(Δ/σ)max = 0.001
2739 reflectionsΔρmax = 0.53 e Å−3
163 parametersΔρmin = −0.59 e Å−3
2 restraintsExtinction correction: none
Primary atom site location: structure-invariant direct methods
Crystal data top
C12H10BrN3OV = 1146.9 (4) Å3
Mr = 292.14Z = 4
Monoclinic, P21/nMo Kα
a = 4.9607 (10) ŵ = 3.57 mm−1
b = 15.586 (3) ÅT = 113 (2) K
c = 14.906 (3) Å0.10 × 0.08 × 0.06 mm
β = 95.65 (3)º
Data collection top
Rigaku Saturn
diffractometer		2739 independent reflections
Absorption correction: multi-scan
(Blessing, 1995)		2123 reflections with I > 2σ(I)
Tmin = 0.717, Tmax = 0.814Rint = 0.053
14191 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0402 restraints
wR(F2) = 0.100H atoms treated by a mixture of
independent and constrained refinement
S = 1.02Δρmax = 0.53 e Å−3
2739 reflectionsΔρmin = −0.59 e Å−3
163 parameters
Special details top

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 > 2sigma(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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Br10.22060 (6)0.579793 (19)0.40491 (2)0.03830 (14)
O11.2134 (4)0.29970 (11)−0.18529 (12)0.0258 (4)
H11.27910.2515−0.18710.039*
N1−0.0149 (4)0.34708 (13)0.29398 (14)0.0207 (5)
N20.4754 (4)0.40060 (14)0.12855 (15)0.0214 (5)
N30.5400 (5)0.53733 (15)0.23987 (17)0.0263 (5)
C10.1953 (5)0.48149 (16)0.32940 (17)0.0213 (5)
C20.0159 (5)0.41727 (16)0.34483 (18)0.0220 (6)
H2−0.08860.42310.39300.026*
C30.1392 (5)0.34101 (15)0.22483 (17)0.0197 (5)
H30.12060.29210.18900.024*
C40.3231 (5)0.40235 (16)0.20351 (17)0.0199 (5)
C50.3553 (5)0.47740 (16)0.25818 (17)0.0202 (5)
C60.5619 (5)0.32877 (16)0.10100 (17)0.0209 (5)
H60.52000.27890.13100.025*
C70.7226 (5)0.32179 (16)0.02482 (17)0.0192 (5)
C80.7946 (5)0.39343 (16)−0.02422 (18)0.0224 (6)
H80.73180.4474−0.00980.027*
C90.9575 (5)0.38505 (16)−0.09363 (18)0.0232 (6)
H91.00210.4333−0.12570.028*
C101.0566 (5)0.30420 (16)−0.11623 (17)0.0202 (5)
C110.9849 (5)0.23290 (16)−0.06839 (17)0.0208 (5)
H111.04750.1789−0.08290.025*
C120.8202 (5)0.24182 (16)0.00099 (17)0.0213 (6)
H120.77360.19330.03240.026*
H3A0.508 (6)0.5891 (10)0.2593 (19)0.028 (8)*
H3B0.590 (5)0.5330 (19)0.1844 (9)0.027 (8)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Br10.0515 (2)0.02764 (19)0.0375 (2)−0.00060 (13)0.01289 (16)−0.01098 (13)
O10.0335 (11)0.0214 (9)0.0253 (10)0.0049 (8)0.0168 (8)0.0036 (8)
N10.0210 (11)0.0234 (11)0.0186 (11)0.0013 (9)0.0061 (9)0.0025 (9)
N20.0192 (11)0.0245 (11)0.0212 (12)0.0001 (9)0.0060 (9)0.0012 (9)
N30.0292 (13)0.0188 (12)0.0321 (14)−0.0044 (10)0.0090 (11)−0.0002 (10)
C10.0241 (13)0.0191 (12)0.0207 (13)0.0038 (10)0.0024 (11)−0.0032 (10)
C20.0235 (14)0.0238 (13)0.0195 (13)0.0042 (11)0.0067 (11)0.0009 (11)
C30.0220 (13)0.0181 (12)0.0194 (13)0.0009 (10)0.0038 (10)−0.0005 (10)
C40.0211 (13)0.0219 (12)0.0171 (13)0.0029 (10)0.0040 (10)0.0014 (10)
C50.0205 (13)0.0185 (12)0.0211 (13)0.0032 (10)0.0003 (10)0.0015 (10)
C60.0187 (13)0.0227 (13)0.0216 (13)−0.0001 (10)0.0042 (10)0.0021 (11)
C70.0181 (12)0.0229 (13)0.0168 (13)−0.0019 (10)0.0030 (10)0.0001 (10)
C80.0235 (13)0.0191 (12)0.0253 (14)0.0027 (11)0.0063 (11)0.0031 (11)
C90.0269 (14)0.0180 (12)0.0259 (14)0.0019 (11)0.0093 (11)0.0058 (11)
C100.0196 (13)0.0223 (12)0.0193 (13)−0.0008 (10)0.0039 (10)0.0022 (10)
C110.0222 (13)0.0186 (12)0.0222 (13)−0.0003 (10)0.0054 (11)−0.0001 (10)
C120.0228 (13)0.0187 (12)0.0229 (14)−0.0013 (10)0.0059 (11)0.0025 (10)
Geometric parameters (Å, °) top
Br1—C11.898 (2)C3—H30.9300
O1—C101.352 (3)C4—C51.426 (3)
O1—H10.8200C6—C71.455 (3)
N1—C21.331 (3)C6—H60.9300
N1—C31.346 (3)C7—C121.396 (3)
N2—C61.281 (3)C7—C81.400 (3)
N2—C41.409 (3)C8—C91.380 (4)
N3—C51.355 (3)C8—H80.9300
N3—H3A0.876 (10)C9—C101.406 (3)
N3—H3B0.889 (10)C9—H90.9300
C1—C21.374 (4)C10—C111.386 (3)
C1—C51.388 (4)C11—C121.387 (3)
C2—H20.9300C11—H110.9300
C3—C41.380 (3)C12—H120.9300
C10—O1—H1109.5N2—C6—C7122.8 (2)
C2—N1—C3116.9 (2)N2—C6—H6118.6
C6—N2—C4119.6 (2)C7—C6—H6118.6
C5—N3—H3A115 (2)C12—C7—C8117.8 (2)
C5—N3—H3B113.1 (19)C12—C7—C6119.7 (2)
H3A—N3—H3B117 (3)C8—C7—C6122.4 (2)
C2—C1—C5121.5 (2)C9—C8—C7120.9 (2)
C2—C1—Br1119.7 (2)C9—C8—H8119.5
C5—C1—Br1118.76 (19)C7—C8—H8119.5
N1—C2—C1122.9 (2)C8—C9—C10120.6 (2)
N1—C2—H2118.5C8—C9—H9119.7
C1—C2—H2118.5C10—C9—H9119.7
N1—C3—C4124.5 (2)O1—C10—C11123.1 (2)
N1—C3—H3117.8O1—C10—C9118.0 (2)
C4—C3—H3117.8C11—C10—C9118.8 (2)
C3—C4—N2126.0 (2)C10—C11—C12120.2 (2)
C3—C4—C5118.4 (2)C10—C11—H11119.9
N2—C4—C5115.5 (2)C12—C11—H11119.9
N3—C5—C1124.8 (2)C11—C12—C7121.6 (2)
N3—C5—C4119.4 (2)C11—C12—H12119.2
C1—C5—C4115.8 (2)C7—C12—H12119.2
C3—N1—C2—C1−0.2 (4)N2—C4—C5—C1176.8 (2)
C5—C1—C2—N10.7 (4)C4—N2—C6—C7−179.3 (2)
Br1—C1—C2—N1179.2 (2)N2—C6—C7—C12177.2 (2)
C2—N1—C3—C4−0.4 (4)N2—C6—C7—C8−0.1 (4)
N1—C3—C4—N2−175.8 (2)C12—C7—C8—C9−0.2 (4)
N1—C3—C4—C50.4 (4)C6—C7—C8—C9177.1 (2)
C6—N2—C4—C3−35.7 (4)C7—C8—C9—C10−0.5 (4)
C6—N2—C4—C5148.0 (2)C8—C9—C10—O1179.5 (2)
C2—C1—C5—N3−178.7 (2)C8—C9—C10—C110.8 (4)
Br1—C1—C5—N32.9 (3)O1—C10—C11—C12−179.1 (2)
C2—C1—C5—C4−0.7 (4)C9—C10—C11—C12−0.6 (4)
Br1—C1—C5—C4−179.13 (17)C10—C11—C12—C7−0.1 (4)
C3—C4—C5—N3178.2 (2)C8—C7—C12—C110.5 (4)
N2—C4—C5—N3−5.1 (3)C6—C7—C12—C11−176.9 (2)
C3—C4—C5—C10.2 (3)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1—H1···N1i0.821.882.688 (3)167
N3—H3A···Br10.877 (18)2.72 (3)3.125 (4)110.0 (19)
N3—H3A···O1ii0.877 (18)2.54 (2)2.967 (5)111.0 (19)
N3—H3B···N20.889 (16)2.28 (3)2.700 (5)109 (2)
Symmetry codes: (i) x+3/2, −y+1/2, z−1/2; (ii) −x+2, −y+1, −z.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1—H1···N1i0.821.882.688 (3)167
N3—H3A···Br10.877 (18)2.72 (3)3.125 (4)110.0 (19)
N3—H3A···O1ii0.877 (18)2.54 (2)2.967 (5)111.0 (19)
N3—H3B···N20.889 (16)2.28 (3)2.700 (5)109 (2)
Symmetry codes: (i) x+3/2, −y+1/2, z−1/2; (ii) −x+2, −y+1, −z.
references
References top

Blessing, R. H. (1995). Acta Cryst. A51, 33–38.

Bruker (1997). SHELXTL. Version 5.10. Bruker AXS Inc., Madison, Wisconsin, USA.

Liu, X.-L., Liu, Y.-H., Shi, Y.-C. & Jian, P.-M. (2002). Chin. J. Org. Chem. 22, 482-488.

Rigaku/MSC (2005). CrystalClear. Rigaku/MSC, The Woodlands, Texas, USA.

Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.

Spek, A. L. (2003). J. Appl. Cryst. 36, 7–13.