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Acta Crystallogr Sect E Struct Rep Online. 2010 March 1; 66(Pt 3): o622.
Published online 2010 February 13. doi:  10.1107/S1600536810005234
PMCID: PMC2983609

2,7-Bis­(trichloro­meth­yl)-1,8-naphthyridine1

Abstract

The complete mol­ecule of the title compound, C10H4Cl6N2, is generated by crystallographic twofold symmetry, with two C atoms lying on the rotation axis; the 1,8-naphthyridine ring is almost planar with an r.m.s. deviation of 0.0002 Å. In the crystal structure, the mol­ecules are stacked in an anti­parallel manner along [001]. Short Cl(...)Cl [3.3502 (4)] and Cl(...)N [3.2004 (11)–3.2220 (10) Å] contacts are observed in the crystal structure.

Related literature

For bond-length data, see: Allen et al. (1987 [triangle]). For graph-set notation of hydrogen-bond motifs, see: Bernstein et al. (1995 [triangle]). For related structures, see: Fun et al. (2009 [triangle]); Wang et al. (2008 [triangle]). For background to the properties and applications of 1,8-naphthyridines, see: Braccio et al. (2008 [triangle]); Chen et al. (2001 [triangle]); Ferrarini et al. (1998 [triangle]; 2000 [triangle]). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 [triangle]).

An external file that holds a picture, illustration, etc.
Object name is e-66-0o622-scheme1.jpg

Experimental

Crystal data

  • C10H4Cl6N2
  • M r = 364.85
  • Monoclinic, An external file that holds a picture, illustration, etc.
Object name is e-66-0o622-efi2.jpg
  • a = 19.9154 (4) Å
  • b = 6.5977 (1) Å
  • c = 10.5975 (2) Å
  • β = 111.483 (2)°
  • V = 1295.73 (4) Å3
  • Z = 4
  • Mo Kα radiation
  • μ = 1.30 mm−1
  • T = 100 K
  • 0.40 × 0.26 × 0.05 mm

Data collection

  • Bruker APEXII CCD diffractometer
  • Absorption correction: multi-scan (SADABS; Bruker, 2005 [triangle]) T min = 0.624, T max = 0.944
  • 28872 measured reflections
  • 4010 independent reflections
  • 3136 reflections with I > 2σ(I)
  • R int = 0.053

Refinement

  • R[F 2 > 2σ(F 2)] = 0.035
  • wR(F 2) = 0.089
  • S = 1.05
  • 4010 reflections
  • 91 parameters
  • All H-atom parameters refined
  • Δρmax = 0.64 e Å−3
  • Δρmin = −0.56 e Å−3

Data collection: APEX2 (Bruker, 2005 [triangle]); cell refinement: SAINT (Bruker, 2005 [triangle]); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008 [triangle]); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009 [triangle]).

Supplementary Material

Crystal structure: contains datablocks global, I. DOI: 10.1107/S1600536810005234/hb5307sup1.cif

Structure factors: contains datablocks I. DOI: 10.1107/S1600536810005234/hb5307Isup2.hkl

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Acknowledgments

SPG thanks the CSIR and DST, Government of India for funds and ACM acknowledges the UGC for a fellowship. The authors also thank the Malaysian Government and Universiti Sains Malaysia for the Research University Golden Goose grant No. 1001/PFIZIK/811012.

supplementary crystallographic information

Comment

The substituted 1,8-naphthyridine compounds have been studied for their chemical and biological activities for a long time. They show various biological activities such as antibacterial (Chen et al., 2001; Ferrarini et al., 1998), anti-inflammatory (Braccio et al., 2008) as well as antihypertensive (Ferrarini et al., 2000) properties. Trichloromethyl-substituted heterocyclic compounds are of great importance due to their broad spectrum biological activities. These interesting properties prompt us to synthesise the title compound (I) and its crystal structure was reported.

The asymmetric unit of the title molecule (Fig. 1), C10H4Cl6N2, contains one half-molecule with two shared C atoms (C3 and C4) lying on a twofold rotation axis. The 1,8-naphthyridine ring is planar with the r.m.s. deviation of 0.0002 (2) Å. One Cl atom (Cl3) of the trichloromethyl substitutent is co-planar with the 1,8-naphthyridine ring which can be indicated by the torsion angle C1–C2–C6–Cl3 = 1.85 (14) Å whereas the other two Cl atoms are in the (+)-anti-clinal and (-)-anti-clinal configurations with the torsion angles C1–C2–C6–Cl1 = 122.04 (10)° and C1–C2–C6–Cl2 = -119.02 (10)°, respectively. The C1—H1···Cl3 intramolecular interaction (Table 1) generates S(5) ring motif (Bernstein et al., 1995). The bond distances are of normal values (Allen et al., 1987) and are comparable with related structures (Fun et al., 2009; Wang et al., 2008).

In the crystal structure (Fig. 2), the non-covalent interactions play a significant role in the three-dimensional supramolecular architecture in which the molecules are stacked in an antiparallel manner along the [0 0 1] direction and the neighbouring molecules are interlinked by C—Cl···Cl interactions into polymeric chains along the [0 1 0] direction. The molecules are also consolidated by Cl···Cl [3.3502 (4)Å] and Cl···N [3.2004 (11)–3.2220 (10) Å] short contacts. π···π interactions were observed with the distances of Cg1···Cg1 = 4.2360 (6) Å (symmetry code: -x, 1 - y, 2 - z) and Cg2···Cg2 = 4.2360 (6) Å (symmetry code: -x, 1 - y, 1 - z): Cg1 and Cg2 are the centroids of C1–C4/C5A/N1 and C1A–C2A/C3–C5/N1A, respectively. All these interactions connect the molecules into a three-dimensional supramolecular network.

Experimental

A mixture of N-chlorosuccinimide (500 mg, 4.5 mmol) and triphenylphosphine (500 mg, 4.2 mmol) was moistened with CCl4 (60 ml) in a round bottom flask and stirred at room temperature for 25 min. A solution of 2,7-dimethyl-1,8-naphthyridine (0.9 g, 5.25 mmol) was added to the suspension and the reaction mixture was stirred and heated under reflux for 7 hr. The solution was cooled and filtered. The evaporated filtrate was washed with saturated aqueous Na2CO3 and extracted repeatedly with CHCl3. Drying over anhydrous Na2SO4, the solvent was removed under reduced pressure. The crude product was purified with SiO2 chromatography (eluted with 1% ethylacetate in petroleum ether) to give the title compound as a white crystalline solid. Colorless slabs of (I) were recrystalized from CH2Cl2:hexane (1:10, v/v) by the slow evaporation of the solvent at room temperature after a week.

Refinement

H atoms were located in a difference maps and refined isotropically. The highest residual electron density peak is located at 1.72 Å from H6 and the deepest hole is located at 0.65 Å from Cl2.

Figures

Fig. 1.
The molecular structure of (I) showing 50% probability displacement ellipsoids. Atoms with suffix A were generated by symmetry code -x, y, -1/2 - z.
Fig. 2.
The crystal packing of the title compound viewed along the b axis, N···Cl and C···.Cl short contacts are shown as dashed lines.

Crystal data

C10H4Cl6N2F(000) = 720
Mr = 364.85Dx = 1.870 Mg m3
Monoclinic, C2/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2ycCell parameters from 4010 reflections
a = 19.9154 (4) Åθ = 2.2–40.0°
b = 6.5977 (1) ŵ = 1.30 mm1
c = 10.5975 (2) ÅT = 100 K
β = 111.483 (2)°Slab, colorless
V = 1295.73 (4) Å30.40 × 0.26 × 0.05 mm
Z = 4

Data collection

Bruker APEXII CCD diffractometer4010 independent reflections
Radiation source: sealed tube3136 reflections with I > 2σ(I)
graphiteRint = 0.053
[var phi] and ω scansθmax = 40.0°, θmin = 2.2°
Absorption correction: multi-scan (SADABS; Bruker, 2005)h = −36→34
Tmin = 0.624, Tmax = 0.944k = −11→11
28872 measured reflectionsl = −18→19

Refinement

Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.035Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.089All H-atom parameters refined
S = 1.05w = 1/[σ2(Fo2) + (0.0403P)2 + 0.889P] where P = (Fo2 + 2Fc2)/3
4010 reflections(Δ/σ)max = 0.002
91 parametersΔρmax = 0.64 e Å3
0 restraintsΔρmin = −0.56 e Å3

Special details

Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 120.0 (1) K.
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.

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

xyzUiso*/Ueq
Cl10.090117 (15)0.01827 (4)1.12884 (3)0.01585 (6)
Cl20.194324 (15)0.02817 (4)0.99732 (3)0.01645 (6)
Cl30.202697 (15)0.31574 (4)1.20815 (3)0.01848 (6)
N10.04657 (5)0.21807 (14)0.85379 (9)0.01358 (15)
C10.09721 (6)0.53166 (17)0.96675 (12)0.01599 (18)
C20.09266 (6)0.31794 (16)0.95656 (11)0.01302 (16)
C30.00000.3281 (2)0.75000.0124 (2)
C40.00000.5430 (2)0.75000.0136 (2)
C5−0.05049 (6)0.64457 (17)0.63741 (11)0.01611 (18)
C60.14272 (6)0.17959 (16)1.06796 (10)0.01333 (16)
H6−0.0513 (10)0.788 (3)0.6355 (18)0.021 (4)*
H10.1292 (10)0.598 (3)1.038 (2)0.024 (5)*

Atomic displacement parameters (Å2)

U11U22U33U12U13U23
Cl10.01798 (11)0.01518 (11)0.01362 (10)−0.00263 (8)0.00487 (8)0.00164 (8)
Cl20.01578 (11)0.01700 (12)0.01533 (11)0.00202 (8)0.00425 (8)0.00040 (8)
Cl30.02005 (12)0.01629 (11)0.01330 (11)−0.00383 (9)−0.00076 (8)−0.00181 (8)
N10.0155 (4)0.0114 (3)0.0115 (3)−0.0004 (3)0.0021 (3)0.0002 (3)
C10.0186 (4)0.0110 (4)0.0152 (4)−0.0022 (3)0.0025 (4)−0.0012 (3)
C20.0145 (4)0.0113 (4)0.0123 (4)−0.0008 (3)0.0038 (3)0.0001 (3)
C30.0137 (5)0.0101 (5)0.0117 (5)0.0000.0027 (4)0.000
C40.0173 (6)0.0095 (5)0.0132 (5)0.0000.0045 (5)0.000
C50.0198 (5)0.0104 (4)0.0155 (4)0.0011 (3)0.0033 (4)0.0009 (3)
C60.0148 (4)0.0122 (4)0.0113 (4)−0.0015 (3)0.0028 (3)−0.0007 (3)

Geometric parameters (Å, °)

Cl1—C61.7725 (11)C2—C61.5358 (15)
Cl2—C61.7827 (11)C3—N1i1.3602 (12)
Cl3—C61.7723 (10)C3—C41.418 (2)
N1—C21.3156 (14)C4—C51.4160 (13)
N1—C31.3602 (12)C4—C5i1.4160 (13)
C1—C5i1.3736 (16)C5—C1i1.3737 (16)
C1—C21.4145 (15)C5—H60.95 (2)
C1—H10.90 (2)
C2—N1—C3117.68 (10)C5—C4—C3118.24 (7)
C5i—C1—C2118.28 (10)C5i—C4—C3118.24 (7)
C5i—C1—H1118.1 (14)C1i—C5—C4118.91 (11)
C2—C1—H1123.6 (14)C1i—C5—H6121.6 (11)
N1—C2—C1124.62 (10)C4—C5—H6119.5 (11)
N1—C2—C6113.48 (9)C2—C6—Cl3113.05 (7)
C1—C2—C6121.90 (9)C2—C6—Cl1109.44 (7)
N1—C3—N1i115.46 (13)Cl3—C6—Cl1107.82 (6)
N1—C3—C4122.27 (6)C2—C6—Cl2108.79 (7)
N1i—C3—C4122.27 (6)Cl3—C6—Cl2108.72 (6)
C5—C4—C5i123.51 (14)Cl1—C6—Cl2108.95 (6)
C3—N1—C2—C10.00 (16)N1i—C3—C4—C5i179.98 (8)
C3—N1—C2—C6−179.95 (8)C5i—C4—C5—C1i180.00 (13)
C5i—C1—C2—N1−0.02 (19)C3—C4—C5—C1i0.00 (13)
C5i—C1—C2—C6179.92 (11)N1—C2—C6—Cl3−178.20 (8)
C2—N1—C3—N1i−179.98 (11)C1—C2—C6—Cl31.85 (14)
C2—N1—C3—C40.02 (11)N1—C2—C6—Cl1−58.01 (11)
N1—C3—C4—C5179.98 (8)C1—C2—C6—Cl1122.04 (10)
N1i—C3—C4—C5−0.02 (8)N1—C2—C6—Cl260.93 (11)
N1—C3—C4—C5i−0.02 (8)C1—C2—C6—Cl2−119.02 (10)

Symmetry codes: (i) −x, y, −z+3/2.

Hydrogen-bond geometry (Å, °)

D—H···AD—HH···AD···AD—H···A
C1—H1···Cl30.90 (2)2.63 (2)3.0085 (12)106.0 (14)

Footnotes

1This paper is dedicated to His Majesty King Bhumibol Adulyadej of Thailand (King Rama IX) for his sustainable development of the country.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5307).

References

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