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Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296

6-(4-Bromo­phenyl)-6,7-di­hydro-1,3-dioxolo­[4,5-g]­quinolin-8(5H)-one: bilayers built from N—H⋯O, C—H⋯O and C—H⋯π(arene) hydrogen bonds

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aDepartment of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB24 3UE, Scotland, bDepartamento de Química Inorgánica y Orgánica, ­Universidad de Jaén, 23071 Jaén, Spain, cGrupo de Investigación de Compuestos Heterociclícos, Departamento de Química, Universidad de Valle, AA 25360, Colombia, and dSchool of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland
*Correspondence e-mail: cg@st-andrews.ac.uk

(Received 29 September 2004; accepted 30 September 2004; online 22 October 2004)

Molecules of the title compound, C16H12BrNO3, exhibit a polarized molecular–electronic structure. A combination of one N—H⋯O hydrogen bond and one C—H⋯O hydrogen bond links the mol­ecules into sheets, and pairs of sheets are linked into bilayers by a single C—H⋯π(arene) hydrogen bond.

Comment

As part of a synthetic programme targeted on compounds displaying important biological properties, we have recently focused on hydro­quinoline derivatives because the dioxolotetra­hydro­quinolin-8-one structure, for example, has been found in compounds used as antimitotic and antitumour agents (Prager & Thredgold, 1968[Prager, R. & Thredgold, M. (1968). Aust. J. Chem. 21, 229-241.]; Donnelly & Farrell, 1990[Donnelly, J. A. & Farrell, D. F. (1990). Tetrahedron, 46, 885-894.]; Kurasawa et al., 2000[Kurasawa, Y., Tsuruoka, A., Rikiishi, N., Fujiwara, N., Okamoto, Y. & Kim, H. S. (2000). J. Heterocycl. Chem. 37, 791-798.]; Zhang et al., 2000[Zhang, S.-X., Feng, J., Kuo, S.-C., Brossi, A., Hamel, E., Tropsha, A. & Li, K.-H. (2000). J. Med. Chem. 43, 167-176.]). We report here the molecular and supramolecular structure of 6-(4-bromo-phenyl)-6,7-di­hydro-1,3-­dioxolo­[4,5-g]­quinolin-8(5H)-one, (I[link]), which has been synthesized by 6-endo intramolecular cyclization from the corresponding 2-amino­chalcone; the structures of a range of these precursors have been reported recently (Low, Cobo, Nogueras et al., 2004[Low, J. N., Cobo, J., Nogueras, M., Cuervo, P., Abonia, R. & Glidewell, C. (2004). Acta Cryst. C60, o744-o750.]).

The mol­ecule of (I[link]) contains a stereogenic centre at atom C10 (Fig. 1[link]); the reference mol­ecule was selected as one having an S configuration, but the centrosymmetric space group accommodates equal numbers of R and S enantiomers. In addition to the two planar carbocyclic rings, the mol­ecule contains two heterocyclic rings, both of which are non-planar. The five-membered ring is folded across the O⋯O line, and for the atom sequence O1—C2—O3—C3a—C7a, the ring-puckering parameter φ2 (Cremer & Pople, 1975[Cremer, D. & Pople, J. A. (1975). J. Am. Chem. Soc. 97, 1354-1358.]) has a value of 37 (2)°, consistent with an envelope conformation (Evans & Boeyens, 1989[Evans, D. G. & Boeyens, J. C. A. (1989). Acta Cryst. B45, 581-590.]). For the nitro­gen-containing ring, the parameters corresponding to the atom sequence N5—C5—C6—C8—C9—C10 are θ = 52.3 (5)° and φ = 291.5 (6)°, corresponding closely to an envelope conformation, where the idealized values are θ = 54.7° and φ = (60n)°; in (I[link]), the ring is folded along the N5⋯C9 line.

[Scheme 1]

The bond distances in (I[link]) (Table 1[link]) provide evidence for some polarization of the molecular–electronic structure. Within the central ring of the fused tricyclic unit, the C3a—C4 and C7—C7a bonds are shorter than the typical values found in delocalized aromatic rings (Allen et al., 1987[Allen, F. H., Kennard, O., Watson, D. G., Brammer, L., Orpen, A. G. & Taylor, R. (1987). J. Chem. Soc. Perkin Trans. 2, pp. S1-19.]) and are much shorter than the remaining bonds, which themselves are longer than normal for delocalized aromatic rings. In addition, the C5—N5 bond is shorter than the typical value for bonds of this type involving pyramidal N (mean value = 1.419 Å and lower quartile value = 1.412 Å), and the C6—C8 bond is again much shorter than normal for Car—COR-type bonds (mean value = 1.488 Å and lower quartile value = 1.478 Å). Finally, we note that the C8—O8 bond is also long for its type. These observations, taken together, provide evidence for the importance of the polarized form (Ia[link]) in addition to the conventional aromatic form (I[link]).

The mol­ecules of (I[link]) are linked by a combination of N—H⋯O, C—H⋯O and C—H⋯π(arene) hydrogen bonds (Table 2[link]) into a double-layer structure, whose formation is readily analysed in terms of the simple motifs generated by each of the individual hydrogen bonds. In the first such motif, atom N5 in the mol­ecule at (x, y, z) acts as a hydrogen-bond donor to carbonyl atom O8 in the mol­ecule at (x, [3 \over 2] − y, [1 \over 2] + z), so forming a C(6) chain (Bernstein et al., 1995[Bernstein, J., Davis, R. E., Shimoni, L. & Chang, N.-L. (1995). Angew. Chem. Int. Ed. Engl. 34, 1555-1573.]) running parallel to the [001] direction and generated by the c-glide plane at y = [3 \over 4] (Fig. 2[link]). In addition, aryl atom C12 in the mol­ecule at (x, y, z) acts as a hydrogen-bond donor also to atom O8 but in the mol­ecule at (x, [1 \over 2] − y, [1 \over 2] + z), so forming a C(7) chain parallel to [001], this time generated by the c-glide plane at y = [1 \over 4] (Fig. 3[link]). The combination of these two chain motifs generates a (100) sheet in the form of a (4,4)-net (Batten & Robson, 1998[Batten, S. R. & Robson, R. (1998). Angew. Chem. Int. Ed. 37, 1460-1494.]) built from a single type of R43(20) ring (Fig. 4[link]).

Two sheets of this type, related to one another by inversion, pass through each unit cell, one each in the domains 0.03 < x < 0.41 and 0.59 < x < 0.97; adjacent sheets are linked into pairs by means of a C—H⋯π(arene) hydrogen bond. Atom C2 in the mol­ecule at (x, y, z), which lies in the domain 0.03 < x < 0.41, acts as a hydrogen-bond donor via atom H2A to the C3A–C7A carbocyclic ring in the mol­ecule at (−x, 2 − y, −z), which lies in the domain −0.41 < x < −0.03; the resulting centrosymmetric motif (Fig. 5[link]) serves to link two adjacent sheets into a bilayer, but there are no direction-specific interactions between adjacent bilayers.

It is of interest to compare the supramolecular aggregation of (I[link]) with that in the related compound (II[link]) (Low, Cobo, Ortíz et al., 2004[Low, J. N., Cobo, J., Ortíz, A., Cuervo, P., Abonia, R. & Glidewell, C. (2004). Acta Cryst. E60, o1057-o1059.]), in which N—H bonds are absent. In (II[link]), the mol­ecules are linked into chains of rings by a combination of C—H⋯O and C—H⋯π(arene) hydrogen bonds, both of which utilize aromatic C—H bonds.

[Figure 1]
Figure 1
The S enantiomer of (I[link]), showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level.
[Figure 2]
Figure 2
Part of the crystal structure of (I[link]), showing the formation of a C(6) chain along [001] built from N—H⋯O hydrogen bonds. For clarity, H atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*) or a hash (#) are at the symmetry positions (x, [3 \over 2] − y, [1 \over 2] + z) and (x, y, 1 + z), respectively.
[Figure 3]
Figure 3
Part of the crystal structure of (I[link]), showing the formation of a C(7) chain along [001] built from C—H⋯O hydrogen bonds. For clarity, H atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*) or a hash (#) are at the symmetry positions (x, [1 \over 2] − y, [1 \over 2] + z) and (x, y, 1 + z), respectively.
[Figure 4]
Figure 4
A stereoview of part of the crystal structure of (I[link]), showing the formation of a (100) sheet of R43(20) rings. For clarity, H atoms not involved in the motifs shown have been omitted.
[Figure 5]
Figure 5
Part of the crystal structure of (I[link]), showing the formation of a centrosymmetric dimer built from C—H⋯π(arene) hydrogen bonds. For clarity, H atoms bonded to N atoms or to the C atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*) are at the symmetry position (−x, 2 − y, −z).

Experimental

For the synthesis of (I[link]), a mixture of 1-(6-amino-1,3-benzodioxol-5-yl)-3-(4-bromo­phenyl)­prop-2-en-1-one (0.2 g, 0.58 mmol), 2-propan­ol (15 ml) and 4-toluene­sulfonic acid (50 mg) was heated under reflux for 2 h. After cooling, the solvent was removed under reduced pressure and the residue was purified by column chromatography on silica gel using hexane–ethyl acetate (4:1 v/v) as eluant. The product, (I[link]) (75% yield; m.p. 490 K), is a yellow luminescent solid. MS (70 eV): m/e (%): 345/347 (90/85, [M+]), 190 (100, [M—C6H4Br]), 163 (61, [M—CH2 = CHC6H4Br]). Crystals suitable for single-crystal X-ray diffraction were grown from a solution in 2-propanol.

Crystal data
  • C16H12BrNO3

  • Mr = 346.18

  • Monoclinic, P21/c

  • a = 21.2470 (11) Å

  • b = 5.8263 (3) Å

  • c = 11.4131 (6) Å

  • β = 98.197 (3)°

  • V = 1398.41 (13) Å3

  • Z = 4

  • Dx = 1.644 Mg m−3

  • Mo Kα radiation

  • Cell parameters from 3166 reflections

  • θ = 3.6–27.5°

  • μ = 2.95 mm−1

  • T = 120 (2) K

  • Plate, yellow

  • 0.18 × 0.18 × 0.04 mm

Data collection
  • Nonius KappaCCD diffractometer

  • φ scans, and ω scans with κ offsets

  • Absorption correction: multi-scan (SADABS; Sheldrick, 2003[Sheldrick, G. M. (2003). SADABS. Version 2.10. University of Göttingen, Germany.]) Tmin = 0.619, Tmax = 0.891

  • 14 573 measured reflections

  • 3166 independent reflections

  • 2329 reflections with I > 2σ(I)

  • Rint = 0.054

  • θmax = 27.5°

  • h = −27 → 27

  • k = −6 → 7

  • l = −14 → 14

Refinement
  • Refinement on F2

  • R[F2 > 2σ(F2)] = 0.046

  • wR(F2) = 0.131

  • S = 1.07

  • 3166 reflections

  • 190 parameters

  • H-atom parameters constrained

  • w = 1/[σ2(Fo2) + (0.0578P)2 + 2.4187P] where P = (Fo2 + 2Fc2)/3

  • (Δ/σ)max = 0.001

  • Δρmax = 1.29 e Å−3

  • Δρmin = −0.88 e Å−3

Table 1
Selected interatomic distances (Å)

C3A—C4 1.365 (5)
C4—C5 1.420 (5)
C5—C6 1.414 (5)
C6—C7 1.424 (5)
C7—C7a 1.356 (5)
C7a—C3a 1.396 (5)
C5—N5 1.368 (4)
C6—C8 1.447 (5)
C8—O8 1.241 (4)

Table 2
Hydrogen-bonding geometry (Å, °)

Cg1 is the centroid of the C3a/C4–C7/C7a ring.

D—H⋯A D—H H⋯A DA D—H⋯A
N5—H5⋯O8i 0.96 1.92 2.867 (3) 170
C12—H12⋯O8ii 0.95 2.38 3.319 (5) 170
C2—H2ACg1iii 0.99 2.74 3.550 (4) 140
Symmetry codes: (i) [x,{\script{3\over 2}}-y,{\script{1\over 2}}+z]; (ii) [x,{\script{1\over 2}}-y,{\script{1\over 2}}+z]; (iii) -x,2-y,-z.

Space group P21/c was uniquely assigned from the systematic absences. All H atoms were located from difference maps and then treated as riding atoms, with C—H distances of 0.95 (aromatic), 0.99 (CH2) or 1.00 Å (aliphatic CH), and an N—H distance of 0.96 Å [Uiso(H) = 1.2Ueq(C,N)]. The atom labelling follows that used for the 1-(6-amino-1,3-benzodioxol-5-yl)-3-aryl­prop-2-en-1-one precursor compounds (Low, Cobo, Nogueras et al., 2004[Low, J. N., Cobo, J., Nogueras, M., Cuervo, P., Abonia, R. & Glidewell, C. (2004). Acta Cryst. C60, o744-o750.]).

Data collection: COLLECT (Hooft, 1999[Hooft, R. W. W. (1999). COLLECT. Nonius BV, Delft, The Netherlands.]); cell refinement: DENZO (Otwinowski & Minor, 1997[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.]) and COLLECT; data reduction: DENZO and COLLECT; program(s) used to solve structure: OSCAIL (McArdle, 2003[McArdle, P. (2003). OSCAIL for Windows. Version 10. Crystallography Centre, Chemistry Department, NUI Galway, Ireland.]) and SHELXS97 (Sheldrick, 1997[Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany.]); program(s) used to refine structure: OSCAIL and SHELXL97 (Sheldrick, 1997[Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany.]); molecular graphics: PLATON (Spek, 2003[Spek, A. L. (2003). J. Appl. Cryst. 36, 7-13.]); software used to prepare material for publication: SHELXL97 and PRPKAPPA (Ferguson, 1999[Ferguson, G. (1999). PRPKAPPA. University of Guelph, Canada.]).

Supporting information


Comment top

As part of a synthetic programme targeted on compounds displaying important biological properties, we have recently focused on hydroquinoline derivatives because the dioxolotetrahydroquinolin-8-one structure, for example, has been found in compounds used as antimitotic and antitumour agents (Prager & Thredgold, 1968; Donnelly & Farrell, 1990; Kurasawa et al., 2000; Zhang et al., 2000). We report here the molecular and supramolecular structure of 6-(4-bromo-phenyl)-6,7-dihydro-5H-[1,3]dioxolo[4,5-g]quinolin-8-one, (I), which has been synthesized by 6-endo intramolecular cyclization from the corresponding 2-aminochalcone; the structures of a range of these precursors have recently been reported (Low, Cobo, Nogueras et al., 2004).

The molecule of (I) contains a stereogenic centre at atom C10 (Fig. 1); the reference molecule was selected as one having an S configuration, but the centrosymmetric space group accommodates equal numbers of R and S enantiomers. In addition to the two planar carbocyclic rings, the molecule contains two heterocyclic rings, both of which are non-planar. The five-membered ring is folded across the O···O line, and for the atom sequence O1—C2—O3—C3A—C7A, the ring-puckering parameter ϕ2 (Cremer & Pople, 1975) has a value of 37 (2)°, consistent with the envelope conformation (Evans & Boeyens, 1989). For the nitrogen-containing ring, the parameters corresponding to the atom sequence N5—C5—C6—C8—C9—C10 are θ = 52.3 (5)° and ϕ = 291.5 (6), corresponding closely to an envelope conformation, where the idealized values are θ = 54.7° and ϕ = (60n)°; in (I), the ring is folded along the N5···C9 line.

The bond distances in (I) (Table 1) provide evidence for some polarization of the molecular–electronic structure. Within the central ring of the fused tricyclic unit, the C3A—C4 and C7—C7A bonds are shorter than the typical values found in delocalized aromatic rings (Allen et al., 1987) and are much shorter than the remaining bonds, which themselves are longer than normal for delocalized aromatic rings. In addition, the C5—N5 bond is shorter than the typical value for bonds of this type involving pyramidal N (mean value 1.419 Å; lower quartile value 1.412 Å), and the C6—C8 bond is again much shorter than normal for Car—COR-type bonds (mean value 1.488 Å, lower quartile value 1.478 Å). Finally, we note that the C8—O8 bond is also long for its type. These observations, taken together, provide evidence for the importance of the polarized form (Ia) in addition to the conventional aromatic form (I).

The molecules of (I) are linked by a combination of N—H···O, C—H···O and C—H···π(arene) hydrogen bonds (Table 2) into a double-layer structure, whose formation is readily analyzed in terms of the simple motifs generated by each of the individual hydrogen bonds. In the first such motif, atom N5 in the molecule at (x, y, z) acts as a hydrogen-bond donor to carbonyl atom O8 in the molecule at (x, 1.5 − y, 0.5 + z), so forming a C(6) chain (Bernstein et al., 1995), running parallel to the [001] direction and generated by the c-glide plane at y = 0.75 (Fig. 2). In addition, aryl atom C12 in the molecule at (x, y, z) acts as a hydrogen-bond donor also to atom O8 but in the molecule at (x, 0.5 − y, 0.5 + z), so forming a C(7) chain parallel to [001], this time generated by the c-glide plane at y = 0.25 (Fig. 3). The combination of these two chain motifs generates a (100) sheet in the form of a (4,4)-net (Batten & Robson, 1998) built from a single type of R34(20) ring (Fig. 4).

Two sheets of this type, related to one another by inversion, pass through each unit cell, one each in the domains 0.03 < x < 0.41 and 0.59 < x < 0.97; adjacent sheets are linked into pairs by means of a C—H···π(arene) hydrogen bond. Atom C2 in the molecule at (x, y, z), which lies in the domain 0.03 < x < 0.41, acts as a hydrogen-bond donor via atom H2A to the C3A–C7A carbocyclic ring in the molecule at (-x, 2 − y, −z), which lies in the domain −0.41 < x < −0.03; the resulting centrosymmetric motif (Fig. 5) serves to link two adjacent sheets into a bilayer, but there are no direction-specific interactions between adjacent bilayers.

It is of interest to compare the supramolecular aggregation of (I) with that in the related compound (II) (Low, Cobo, Ortíz et al., 2004), in which N—H bonds are absent. In (II), the molecules are linked into chains of rings by a combination of C—H···O and C—H···π(arene) hydrogen bonds, both of which utilize aromatic C—H bonds. Cg1 is the centroid of the C3A/C4–C7/C7A ring.

Experimental top

For the synthesis of (I) a mixture of 1-(6-amino-1,3-benzodioxol-5-yl)-3-(4-bromophenyl)prop-2-en-1-one (0.2 g, 0.58 mmol), 2-propanol (15 ml) and 4-toluenesulfonic acid (50 mg) was heated under reflux for 2 h. After cooling, the solvent was removed under reduced pressure and the residue was purified by column chromatography on silica gel using hexane–ethyl acetate (4:1, v/v) as eluant. The product, (I) (75% yield; m.p. 490 K), is a yellow luminescent solid. MS (70 eV): m/e (%): 345/347 (90/85, [M+]), 190 (100), [M—C6H4Br]), 163 (61), [M—CH2=CHC6H4Br]). Crystals suitable for single-crystal X-ray diffraction were grown from a solution in 2-propanol.

Refinement top

Space group P21/c was uniquely assigned from the systematic absences. All H atoms were located from difference maps, and then treated as riding atoms, with C—H distances of 1.00 (atom C10), 0.95 (aromatic) or 0.99 Å (CH2) and an N—H distance of 0.96 Å, and with Uiso(H) = 1.2Ueq(C,N). The atom-labelling follows that used for the 1-(6-amino-1,3-benzodioxol-5-yl)-3-arylprop-2-en-1-one precursor compounds (Low, Cobo, Nogueras et al., 2004).

Computing details top

Data collection: COLLECT (Hooft, 1999); cell refinement: DENZO (Otwinowski & Minor, 1997) and COLLECT; data reduction: DENZO (Otwinowski & Minor, 1997) 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).

Figures top
[Figure 1] Fig. 1. The S enantiomer of (I), showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level.
[Figure 2] Fig. 2. Part of the crystal structure of (I), showing the formation of a C(6) chain along [001] built from N—H···O hydrogen bonds. For clarity, H atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*) or a hash (#) are at the symmetry positions (x, 1.5 − y, 0.5 + z) and (x, y, 1 + z), respectively.
[Figure 3] Fig. 3. Part of the crystal structure of (I), showing the formation of a C(7) chain along [001] built from C—H···O hydrogen bonds. For clarity, H atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*) or a hash (#) are at the symmetry positions (x, 0.5 − y, 0.5 + z) and (x, y, 1 + z), respectively.
[Figure 4] Fig. 4. A stereoview of part of the crystal structure of (I), showing the formation of a (100) sheet of R34(20) rings. For clarity, H atoms not involved in the motifs shown have been omitted.
[Figure 5] Fig. 5. Part of the crystal structure of (I), showing the formation of a centrosymmetric dimer built from C—H···π(arene) hydrogen bonds. For clarity, H atoms bonded to N atoms or to the C atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*) are at the symmetry position (-x, 2 − y, −z).
6-(4-Bromophenyl)-6,7-dihydro-1,3-dioxolo[4,5-g]quinolin-8(5H)-one top
Crystal data top
C16H12BrNO3F(000) = 696
Mr = 346.18Dx = 1.644 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 3166 reflections
a = 21.2470 (11) Åθ = 3.6–27.5°
b = 5.8263 (3) ŵ = 2.95 mm1
c = 11.4131 (6) ÅT = 120 K
β = 98.197 (3)°Plate, yellow
V = 1398.41 (13) Å30.18 × 0.18 × 0.04 mm
Z = 4
Data collection top
Nonius KappaCCD
diffractometer
3166 independent reflections
Radiation source: fine-focus sealed X-ray tube2329 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.054
ϕ scans, and ω scans with κ offsetsθmax = 27.5°, θmin = 3.6°
Absorption correction: multi-scan
(SADABS; Sheldrick, 2003)
h = 2727
Tmin = 0.619, Tmax = 0.891k = 67
14573 measured reflectionsl = 1414
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.046Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.131H-atom parameters constrained
S = 1.07 w = 1/[σ2(Fo2) + (0.0578P)2 + 2.4187P]
where P = (Fo2 + 2Fc2)/3
3166 reflections(Δ/σ)max = 0.001
190 parametersΔρmax = 1.29 e Å3
0 restraintsΔρmin = 0.88 e Å3
Crystal data top
C16H12BrNO3V = 1398.41 (13) Å3
Mr = 346.18Z = 4
Monoclinic, P21/cMo Kα radiation
a = 21.2470 (11) ŵ = 2.95 mm1
b = 5.8263 (3) ÅT = 120 K
c = 11.4131 (6) Å0.18 × 0.18 × 0.04 mm
β = 98.197 (3)°
Data collection top
Nonius KappaCCD
diffractometer
3166 independent reflections
Absorption correction: multi-scan
(SADABS; Sheldrick, 2003)
2329 reflections with I > 2σ(I)
Tmin = 0.619, Tmax = 0.891Rint = 0.054
14573 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0460 restraints
wR(F2) = 0.131H-atom parameters constrained
S = 1.07Δρmax = 1.29 e Å3
3166 reflectionsΔρmin = 0.88 e Å3
190 parameters
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Br140.475584 (18)0.66273 (8)0.63741 (3)0.04391 (18)
O10.03463 (12)1.0776 (5)0.1556 (2)0.0330 (6)
O30.04465 (12)1.3103 (4)0.0106 (2)0.0294 (6)
O80.20169 (12)0.4244 (4)0.0591 (2)0.0281 (5)
N50.21863 (13)0.8716 (5)0.2189 (2)0.0245 (6)
C20.01441 (18)1.2891 (6)0.1107 (3)0.0291 (8)
C3A0.08805 (16)1.1376 (6)0.0287 (3)0.0228 (7)
C40.13109 (16)1.0989 (6)0.1274 (3)0.0237 (7)
C50.17195 (15)0.9066 (6)0.1249 (3)0.0223 (7)
C60.16483 (15)0.7576 (6)0.0261 (3)0.0225 (7)
C70.11890 (16)0.8058 (6)0.0744 (3)0.0255 (7)
C7A0.08238 (16)0.9957 (6)0.0708 (3)0.0250 (7)
C80.20693 (16)0.5629 (6)0.0243 (3)0.0232 (7)
C90.25972 (17)0.5399 (6)0.1262 (3)0.0275 (7)
C100.24398 (17)0.6416 (6)0.2419 (3)0.0268 (7)
C110.30174 (16)0.6497 (6)0.3375 (3)0.0258 (7)
C120.31097 (18)0.4750 (7)0.4206 (3)0.0331 (8)
C130.36354 (18)0.4776 (7)0.5091 (3)0.0343 (8)
C140.40543 (17)0.6562 (7)0.5139 (3)0.0294 (8)
C150.39783 (18)0.8316 (7)0.4331 (3)0.0332 (8)
C160.34613 (18)0.8277 (6)0.3441 (3)0.0311 (8)
H2A0.03241.29040.11420.035*
H2B0.02681.41900.15840.035*
H40.13361.19620.19470.028*
H50.21210.95690.28810.029*
H70.11400.70810.14180.031*
H9A0.29810.61710.10520.033*
H9B0.27000.37520.13860.033*
H100.21060.54440.27080.032*
H120.28130.35250.41730.040*
H130.37010.35660.56530.041*
H150.42760.95410.43800.040*
H160.34080.94740.28700.037*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Br140.0303 (2)0.0694 (3)0.0291 (2)0.0001 (2)0.00602 (16)0.00020 (18)
O10.0359 (14)0.0393 (15)0.0202 (12)0.0087 (12)0.0083 (10)0.0031 (10)
O30.0334 (14)0.0325 (14)0.0200 (12)0.0081 (11)0.0039 (10)0.0005 (9)
O80.0378 (14)0.0283 (13)0.0188 (12)0.0023 (11)0.0063 (10)0.0000 (9)
N50.0249 (15)0.0318 (16)0.0159 (13)0.0030 (12)0.0003 (11)0.0014 (11)
C20.0303 (19)0.030 (2)0.0251 (17)0.0019 (15)0.0030 (14)0.0011 (14)
C3A0.0236 (16)0.0267 (17)0.0188 (16)0.0007 (14)0.0049 (13)0.0003 (13)
C40.0269 (17)0.0268 (17)0.0177 (16)0.0021 (14)0.0041 (13)0.0003 (12)
C50.0205 (16)0.0291 (18)0.0174 (16)0.0037 (13)0.0036 (12)0.0014 (12)
C60.0207 (16)0.0289 (17)0.0180 (15)0.0028 (14)0.0031 (13)0.0003 (13)
C70.0243 (17)0.0322 (19)0.0201 (16)0.0027 (14)0.0040 (13)0.0034 (13)
C7A0.0242 (16)0.0317 (19)0.0185 (16)0.0017 (14)0.0006 (13)0.0012 (13)
C80.0239 (17)0.0287 (18)0.0180 (16)0.0039 (14)0.0065 (13)0.0013 (13)
C90.0296 (18)0.032 (2)0.0215 (17)0.0022 (15)0.0060 (14)0.0020 (14)
C100.0250 (17)0.0304 (19)0.0244 (17)0.0014 (15)0.0013 (14)0.0030 (14)
C110.0233 (17)0.0334 (19)0.0205 (16)0.0032 (15)0.0026 (13)0.0038 (13)
C120.034 (2)0.0290 (19)0.035 (2)0.0031 (16)0.0010 (16)0.0001 (15)
C130.037 (2)0.034 (2)0.0298 (19)0.0034 (17)0.0038 (15)0.0076 (15)
C140.0220 (17)0.042 (2)0.0241 (18)0.0026 (16)0.0019 (14)0.0015 (15)
C150.0260 (18)0.038 (2)0.035 (2)0.0101 (16)0.0033 (15)0.0000 (16)
C160.0319 (19)0.033 (2)0.0271 (18)0.0002 (16)0.0008 (15)0.0069 (15)
Geometric parameters (Å, º) top
O1—C7A1.383 (4)C7—H70.95
O1—C21.424 (5)C8—C91.502 (5)
C2—O31.446 (4)C9—C101.528 (5)
C2—H2A0.99C9—H9A0.99
C2—H2B0.99C9—H9B0.99
O3—C3A1.360 (4)C10—C111.522 (5)
C3A—C41.365 (5)C10—H101.00
C4—C51.420 (5)C11—C121.386 (5)
C5—C61.414 (5)C11—C161.397 (5)
C6—C71.424 (5)C12—C131.395 (5)
C7—C7A1.356 (5)C12—H120.95
C7A—C3A1.396 (5)C13—C141.366 (5)
C5—N51.368 (4)C13—H130.95
C6—C81.447 (5)C14—C151.370 (5)
C8—O81.241 (4)C14—Br141.901 (3)
C4—H40.95C15—C161.386 (5)
N5—C101.454 (4)C15—H150.95
N5—H50.96C16—H160.95
C7A—O1—C2106.0 (3)C6—C8—C9117.0 (3)
O1—C2—O3107.6 (3)C8—C9—C10113.8 (3)
O1—C2—H2A110.2C8—C9—H9A108.8
O3—C2—H2A110.2C10—C9—H9A108.8
O1—C2—H2B110.2C8—C9—H9B108.8
O3—C2—H2B110.2C10—C9—H9B108.8
H2A—C2—H2B108.5H9A—C9—H9B107.7
C3A—O3—C2106.3 (2)N5—C10—C11109.9 (3)
O3—C3A—C4127.4 (3)N5—C10—C9108.8 (3)
O3—C3A—C7A109.7 (3)C11—C10—C9112.2 (3)
C4—C3A—C7A122.9 (3)N5—C10—H10108.6
C3A—C4—C5117.0 (3)C11—C10—H10108.6
C3A—C4—H4121.5C9—C10—H10108.6
C5—C4—H4121.5C12—C11—C16118.7 (3)
N5—C5—C6121.1 (3)C12—C11—C10119.3 (3)
N5—C5—C4118.6 (3)C16—C11—C10122.1 (3)
C6—C5—C4120.3 (3)C11—C12—C13120.5 (3)
C5—N5—C10119.2 (3)C11—C12—H12119.7
C5—N5—H5113.2C13—C12—H12119.7
C10—N5—H5114.9C14—C13—C12119.2 (3)
C5—C6—C7120.3 (3)C14—C13—H13120.4
C5—C6—C8119.8 (3)C12—C13—H13120.4
C7—C6—C8119.8 (3)C13—C14—C15121.9 (3)
C7A—C7—C6117.8 (3)C13—C14—Br14118.9 (3)
C7A—C7—H7121.1C15—C14—Br14119.3 (3)
C6—C7—H7121.1C14—C15—C16119.1 (3)
C7—C7A—O1128.8 (3)C14—C15—H15120.5
C7—C7A—C3A121.7 (3)C16—C15—H15120.5
O1—C7A—C3A109.5 (3)C15—C16—C11120.7 (3)
O8—C8—C6122.2 (3)C15—C16—H16119.7
O8—C8—C9120.8 (3)C11—C16—H16119.7
C7A—O1—C2—O38.9 (4)C5—C6—C8—O8178.4 (3)
O1—C2—O3—C3A9.1 (4)C7—C6—C8—O85.3 (5)
C2—O3—C3A—C4174.9 (3)C5—C6—C8—C94.3 (5)
C2—O3—C3A—C7A5.8 (4)C7—C6—C8—C9172.1 (3)
O3—C3A—C4—C5179.7 (3)O8—C8—C9—C10153.3 (3)
C7A—C3A—C4—C51.2 (5)C6—C8—C9—C1029.3 (4)
C3A—C4—C5—N5175.5 (3)C5—N5—C10—C11171.2 (3)
C3A—C4—C5—C63.4 (5)C5—N5—C10—C948.0 (4)
C6—C5—N5—C1024.8 (5)C8—C9—C10—N549.0 (4)
C4—C5—N5—C10156.3 (3)C8—C9—C10—C11170.9 (3)
N5—C5—C6—C7175.6 (3)N5—C10—C11—C12142.0 (3)
C4—C5—C6—C73.3 (5)C9—C10—C11—C1296.8 (4)
N5—C5—C6—C80.8 (5)N5—C10—C11—C1638.2 (4)
C4—C5—C6—C8179.7 (3)C9—C10—C11—C1683.0 (4)
C5—C6—C7—C7A0.8 (5)C16—C11—C12—C130.1 (5)
C8—C6—C7—C7A177.1 (3)C10—C11—C12—C13179.9 (3)
C6—C7—C7A—O1179.3 (3)C11—C12—C13—C140.9 (6)
C6—C7—C7A—C3A1.5 (5)C12—C13—C14—C151.0 (6)
C2—O1—C7A—C7176.5 (4)C12—C13—C14—Br14178.2 (3)
C2—O1—C7A—C3A5.4 (4)C13—C14—C15—C160.1 (6)
O3—C3A—C7A—C7177.9 (3)Br14—C14—C15—C16179.1 (3)
C4—C3A—C7A—C71.4 (5)C14—C15—C16—C110.9 (6)
O3—C3A—C7A—O10.3 (4)C12—C11—C16—C151.0 (5)
C4—C3A—C7A—O1179.6 (3)C10—C11—C16—C15179.2 (3)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N5—H5···O8i0.961.922.867 (3)170
C12—H12···O8ii0.952.383.319 (5)170
C2—H2A···Cg1iii0.992.743.550 (4)140
Symmetry codes: (i) x, y+3/2, z+1/2; (ii) x, y+1/2, z+1/2; (iii) x, y+2, z.

Experimental details

Crystal data
Chemical formulaC16H12BrNO3
Mr346.18
Crystal system, space groupMonoclinic, P21/c
Temperature (K)120
a, b, c (Å)21.2470 (11), 5.8263 (3), 11.4131 (6)
β (°) 98.197 (3)
V3)1398.41 (13)
Z4
Radiation typeMo Kα
µ (mm1)2.95
Crystal size (mm)0.18 × 0.18 × 0.04
Data collection
DiffractometerNonius KappaCCD
diffractometer
Absorption correctionMulti-scan
(SADABS; Sheldrick, 2003)
Tmin, Tmax0.619, 0.891
No. of measured, independent and
observed [I > 2σ(I)] reflections
14573, 3166, 2329
Rint0.054
(sin θ/λ)max1)0.650
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.046, 0.131, 1.07
No. of reflections3166
No. of parameters190
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)1.29, 0.88

Computer programs: COLLECT (Hooft, 1999), DENZO (Otwinowski & Minor, 1997) and COLLECT, OSCAIL (McArdle, 2003) and SHELXS97 (Sheldrick, 1997), OSCAIL and SHELXL97 (Sheldrick, 1997), PLATON (Spek, 2003), SHELXL97 and PRPKAPPA (Ferguson, 1999).

Selected bond lengths (Å) top
C3A—C41.365 (5)C7A—C3A1.396 (5)
C4—C51.420 (5)C5—N51.368 (4)
C5—C61.414 (5)C6—C81.447 (5)
C6—C71.424 (5)C8—O81.241 (4)
C7—C7A1.356 (5)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N5—H5···O8i0.961.922.867 (3)170
C12—H12···O8ii0.952.383.319 (5)170
C2—H2A···Cg1iii0.992.743.550 (4)140
Symmetry codes: (i) x, y+3/2, z+1/2; (ii) x, y+1/2, z+1/2; (iii) x, y+2, z.
 

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. JNL thanks NCR Self-Service, Dundee, for grants that have provided computing facilities for this work. RA thanks the Fundación para la Promoción de la Investigación y la Tecnología (Banco de la República) and the Universidad del Valle for financial support. PC thanks COLCIENCIAS for a doctoral fellowship. JC thanks the Junta de Andalucía and the Universidad de Jaén for financial support.

References

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