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The title compound, C24H19N3O, crystallizes in the centrosymmetric space group P21/a with one mol­ecule in the asymmetric unit. The tetra­hydro­pyridine ring has a boat conformation. The dihedral angle between the fused pyridine rings is 16.2 (1)°. The equatorial and axial orientations of the two phenyl groups with respect to the tetra­hydro­pyridine ring are confirmed. The nitroso group is coplanar with the attached C—N—C group. The interplanar angle formed between the fused tetra­hydro­pyridine and benzene planes is 13.4 (1)°. The crystal packing is stabilized by an intermolecular C—H...O hydrogen bond, which forms a C(9) graph-set chain running along the [001] direction.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S0108270102022758/na1587sup1.cif
Contains datablocks I, global

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S0108270102022758/na1587Isup2.hkl
Contains datablock I

CCDC reference: 208028

Comment top

Nitrosamines are known to exhibit carcinogenic properties (Magee et al., 1976; Ferguson, 1975). Ever since the first demonstration of carcinogenicity in N-nitroso compounds (Magee & Barnes, 1956), there have been extensive biochemical and physicochemical studies on their structure-activity relationships (Lijinsky, 1984; Magee et al., 1976). However, there is little information on the detailed geometries of N-nitroso compounds, although several solution NMR spectroscopic investigations have been carried out (Fraser & Grindley, 1975; Forrest et al., 1974; Ellis et al., 1974; Priya et al., 1992). Certain N-nitrosoureas are used as antitumour agents or antibiotics (Sapse et al., 1988).

1,6-Naphthyridines have extensive pharmacological properties. These derivatives have antiinflammatory (Di Braccio et al., 1997), antibacterial (Hong et al., 1997), antitumour (Chen et al.., 1997), cardiotonic (Mohan & Mishra, 1997), and anticonvulsant and insecticidal (Damon & Nadelson, 1981) properties. They exhibit unique photophysical, photochemical and optical properties due to the charge-transfer interaction between the donor and acceptor substituents. They can behave as nonlinear optical materials, which have various applications in the field of telecommunications (Murugan, 1997). In addition, 1,6-naphthyridine derivatives are also used as novel potent adenosine 3',5'-cyclic phosphate phosphodiesterase III inhibitors (Singh et al., 1995).

We have undertaken the synthesis and structural analysis of a series of cyclic nitrosamines (Senthilkumar et al., 1992, 1995; Ravinderan et al., 1992; Priya et al., 1992). The 1,6-naphthyridine system is known (Reed et al., 1988; Vinick, 1989), but only a few structural data have been reported to date (Balogh et al., 1986; Goméz de Andérez et al., 1992; Govindasamy et al., 2000). Against this background, and in order to obtain detailed information about stereochemical and conformational changes induced by the substituents on the title compound, (I), in the solid state, its X-ray structure determination has been carried out and the results are presented here. \sch

Fig. 1 shows a view of (I) with the atom-numbering scheme. The N2—N3 and N3O bond lengths and the N2—N3—O bond angle are comparable with the previously reported values of 1.331 (2) Å, 1.231 (2) Å and 115.3 (1)°, respectively (Priya et al., 1992). The N2—N3 bond exhibits partial double-bond character, which leads to restricted rotation about the bond, as also found from solution NMR studies (Cooney & Brownstein, 1974). The N—C distances in (I) agree well with the literature values (Allen et al., 1987).

The nitroso group of (I) has a coplanar orientation with respect to atoms C2 and C3, as is evident from the C3—N2—N3—O and C2—N2—N3—O torsion angles, respectively. The C11—C1—C2—C19 torsion angle shows that the phenyl ring attached at C2 is equatorially disposed in the naphthyridine system. The C11—C12—C3—C13 torsion angle shows that the phenyl group attached at C3 is axially oriented in the naphthyridine system. A similar effect has also been observed by Lavaanya et al. (2001). The dihedral angle between the fused pyridine rings is 16.2 (1)°. The interplanar angle formed between the fused tetrahydropyridine and benzo planes is 13.4 (1)°. The angle between the planes of the C13—C18 and C19—C24 phenyl rings is 88.9 (1)°.

The substitution of a methyl or nitroso group at the N2 position has been shown to exert a large influence on the conformation of the ring and the orientation of the ring substituents (Vierhapper, 1980; Baliah & Natarajan, 1989). The tetrahydropyridine ring of (I) has a boat conformation, with a total puckering amplitude (Cremer & Pople, 1975) of QT = 0.520 (2) Å and with values of the lowest displacement asymmetry parameters (Nardelli, 1983) of ΔS(C1) = 0.015 (1) and ΔS(N2—C2) = 0.019 (1).

In addition to van der Waals interactions, the crystal packing of (I) is stabilized by an C—H···O intermolecular hydrogen bond, with C5—H5 0.93, H5—Oi 2.47 and C5···Oi 3.179 (3) Å, and C5—H5···Oi 133° [symmetry code: (i) x + 1/2, 3/2 − y, 1 + z]. This intermolecular hydrogen bond forms a C(9) (Bernstein et al., 1995) graph-set chain, O—N3—N2—C3—C12—C4—C10—C5—H5, running along the [001] direction (Fig. 2).

Experimental top

The title compound was obtained by the nitrosation of the corresponding amine with NaNO2/HCl in ethanol. Diffraction quality crystals of (I) were obtained by recrystallization from ethanol. The parent amine, 1,3-diphenyl-1,2,3,4-tetrahydrobenzo[b][1,6]naphthyridine, was obtained by the action of NaN3/H2SO4 on 2,4,6,8-tetraphenyl-3,7-diazabicyclo[3.3.1]nonan-9-one (Sivakumar, 2000) as a non-crystalline product.

Refinement top

All H atoms were geometrically fixed and allowed to ride on their parent atoms, with C—H distances in the range 0.86–0.96 Å, and Uiso = 1.5eq(C) for methyl H atoms and 1.2Ueq(C) for other H atoms.

Computing details top

Data collection: CAD-4 EXPRESS (Enraf-Nonius, 1994); cell refinement: CAD-4 EXPRESS; data reduction: XCAD4 (Harms & Wocadlo, 1995); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ZORTEP (Zsolnai, 1997) and PLATON (Spek, 2000); software used to prepare material for publication: SHELX97 and PARST (Nardelli, 1995).

Figures top
[Figure 1] Fig. 1. The molecular structure of (I) with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level and H atoms are shown as small spheres of arbitrary radii.
[Figure 2] Fig. 2. Part of the crystal structure of (I), with the hydrogen-bonding scheme shown as dashed lines
2-Nitroso-1,3-diphenyl-1,2,3,4-tetrahydrobenzo[b][1,6]naphthyridine top
Crystal data top
C24H19N3OF(000) = 768
Mr = 365.42Dx = 1.290 Mg m3
Monoclinic, P21/aCu Kα radiation, λ = 1.54180 Å
a = 9.713 (6) ÅCell parameters from 25 reflections
b = 19.265 (8) Åθ = 4.4–68.0°
c = 10.450 (2) ŵ = 0.64 mm1
β = 105.74 (3)°T = 293 K
V = 1882.1 (14) Å3Plate, pale yellow
Z = 40.2 × 0.2 × 0.15 mm
Data collection top
Enraf-Nonius CAD-4
diffractometer
Rint = 0.052
Radiation source: fine-focus sealed tubeθmax = 68.0°, θmin = 4.4°
Graphite monochromatorh = 1111
non–profiled w/2θ scansk = 023
3876 measured reflectionsl = 1212
3435 independent reflections3 standard reflections every 100 reflections
2660 reflections with I > 2σ(I) intensity decay: none
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)] = 0.057Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.172H-atom parameters constrained
S = 1.07 w = 1/[σ2(Fo2) + (0.1135P)2 + 0.167P]
where P = (Fo2 + 2Fc2)/3
3435 reflections(Δ/σ)max < 0.001
253 parametersΔρmax = 0.23 e Å3
0 restraintsΔρmin = 0.20 e Å3
Crystal data top
C24H19N3OV = 1882.1 (14) Å3
Mr = 365.42Z = 4
Monoclinic, P21/aCu Kα radiation
a = 9.713 (6) ŵ = 0.64 mm1
b = 19.265 (8) ÅT = 293 K
c = 10.450 (2) Å0.2 × 0.2 × 0.15 mm
β = 105.74 (3)°
Data collection top
Enraf-Nonius CAD-4
diffractometer
Rint = 0.052
3876 measured reflections3 standard reflections every 100 reflections
3435 independent reflections intensity decay: none
2660 reflections with I > 2σ(I)
Refinement top
R[F2 > 2σ(F2)] = 0.0570 restraints
wR(F2) = 0.172H-atom parameters constrained
S = 1.07Δρmax = 0.23 e Å3
3435 reflectionsΔρmin = 0.20 e Å3
253 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 > 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) top
xyzUiso*/Ueq
O0.2538 (2)0.74971 (9)0.15540 (15)0.0822 (5)
N10.26428 (18)0.85872 (8)0.22203 (15)0.0560 (4)
N20.14707 (17)0.81452 (8)0.00869 (15)0.0519 (4)
N30.2456 (2)0.76712 (9)0.04006 (17)0.0672 (5)
C10.0730 (2)0.88174 (11)0.02359 (18)0.0566 (5)
H1A0.15250.88310.01600.068*
H1B0.03970.92900.02680.068*
C20.0481 (2)0.83912 (9)0.06702 (18)0.0510 (4)
H20.00530.79820.09670.061*
C30.1325 (2)0.83110 (10)0.15039 (18)0.0536 (5)
H30.17620.79250.18630.064*
C40.0682 (2)0.81396 (10)0.3577 (2)0.0571 (5)
H40.00270.79770.40100.069*
C50.2679 (3)0.80539 (12)0.5640 (2)0.0682 (6)
H50.20640.79030.61260.082*
C60.4089 (3)0.81350 (11)0.6254 (2)0.0716 (6)
H60.44270.80430.71590.086*
C70.5048 (3)0.83554 (11)0.5549 (2)0.0681 (6)
H70.60140.84070.59830.082*
C80.4556 (2)0.84951 (11)0.4216 (2)0.0636 (5)
H80.51940.86430.37510.076*
C90.3103 (2)0.84176 (9)0.35445 (19)0.0538 (5)
C100.2133 (2)0.81961 (9)0.42672 (19)0.0561 (5)
C110.1265 (2)0.85525 (10)0.16292 (18)0.0518 (4)
C120.0236 (2)0.83237 (9)0.22719 (18)0.0515 (4)
C130.2166 (2)0.89604 (10)0.16495 (17)0.0532 (5)
C140.3646 (2)0.89194 (13)0.1294 (2)0.0685 (6)
H140.40910.85050.09610.082*
C150.4473 (3)0.94873 (15)0.1426 (3)0.0781 (7)
H150.54660.94540.11860.094*
C160.3817 (3)1.00969 (14)0.1911 (3)0.0796 (7)
H160.43671.04800.20010.095*
C170.2354 (3)1.01483 (13)0.2266 (2)0.0729 (6)
H170.19181.05670.25880.087*
C180.1518 (2)0.95774 (11)0.2149 (2)0.0613 (5)
H180.05260.96120.24060.074*
C190.12092 (19)0.88110 (9)0.18879 (17)0.0487 (4)
C200.0778 (2)0.87241 (11)0.30400 (19)0.0610 (5)
H200.01280.83770.30840.073*
C210.1313 (3)0.91526 (13)0.4122 (2)0.0713 (6)
H210.10100.90930.48870.086*
C220.2287 (3)0.96660 (12)0.4083 (2)0.0689 (6)
H220.26350.99550.48130.083*
C230.2742 (2)0.97476 (11)0.2953 (2)0.0634 (5)
H230.34171.00850.29250.076*
C240.2195 (2)0.93276 (10)0.18588 (19)0.0558 (5)
H240.24920.93930.10930.067*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
O0.0965 (13)0.0837 (11)0.0689 (10)0.0292 (9)0.0266 (9)0.0193 (8)
N10.0563 (10)0.0551 (9)0.0562 (9)0.0051 (7)0.0148 (7)0.0006 (7)
N20.0516 (9)0.0517 (8)0.0536 (8)0.0102 (7)0.0163 (7)0.0031 (6)
N30.0756 (12)0.0641 (10)0.0609 (10)0.0189 (9)0.0168 (9)0.0077 (8)
C10.0520 (11)0.0630 (11)0.0554 (10)0.0091 (9)0.0156 (9)0.0051 (8)
C20.0517 (11)0.0504 (9)0.0540 (10)0.0011 (8)0.0196 (8)0.0020 (7)
C30.0583 (12)0.0568 (10)0.0494 (10)0.0075 (8)0.0207 (8)0.0039 (8)
C40.0651 (12)0.0527 (10)0.0556 (10)0.0024 (9)0.0196 (9)0.0070 (8)
C50.0779 (15)0.0669 (13)0.0562 (11)0.0001 (11)0.0121 (10)0.0109 (9)
C60.0878 (17)0.0592 (12)0.0579 (12)0.0039 (11)0.0029 (11)0.0046 (9)
C70.0636 (13)0.0549 (11)0.0753 (13)0.0004 (9)0.0005 (11)0.0001 (9)
C80.0603 (13)0.0588 (11)0.0673 (12)0.0019 (9)0.0097 (10)0.0008 (9)
C90.0573 (11)0.0432 (9)0.0585 (10)0.0005 (8)0.0117 (9)0.0008 (7)
C100.0635 (12)0.0467 (9)0.0563 (11)0.0020 (8)0.0134 (9)0.0048 (8)
C110.0541 (11)0.0490 (9)0.0534 (10)0.0029 (8)0.0167 (8)0.0003 (7)
C120.0549 (11)0.0479 (9)0.0521 (10)0.0045 (8)0.0153 (8)0.0012 (7)
C130.0539 (11)0.0636 (11)0.0475 (9)0.0037 (8)0.0231 (8)0.0041 (8)
C140.0547 (12)0.0814 (14)0.0752 (13)0.0093 (10)0.0274 (10)0.0064 (11)
C150.0491 (12)0.1019 (18)0.0882 (16)0.0055 (12)0.0269 (11)0.0037 (14)
C160.0764 (16)0.0807 (16)0.0917 (16)0.0113 (13)0.0399 (13)0.0009 (13)
C170.0743 (15)0.0663 (13)0.0873 (15)0.0003 (11)0.0376 (13)0.0034 (11)
C180.0534 (11)0.0657 (12)0.0686 (12)0.0046 (9)0.0228 (9)0.0019 (9)
C190.0461 (10)0.0514 (9)0.0494 (9)0.0049 (7)0.0144 (8)0.0027 (7)
C200.0687 (13)0.0633 (11)0.0575 (11)0.0006 (10)0.0281 (10)0.0051 (9)
C210.0887 (17)0.0784 (14)0.0544 (11)0.0057 (12)0.0322 (11)0.0018 (10)
C220.0809 (15)0.0644 (12)0.0605 (12)0.0058 (11)0.0176 (11)0.0099 (10)
C230.0666 (13)0.0534 (11)0.0700 (12)0.0066 (9)0.0180 (10)0.0060 (9)
C240.0574 (11)0.0573 (11)0.0556 (10)0.0024 (8)0.0204 (9)0.0024 (8)
Geometric parameters (Å, º) top
O—N31.233 (2)C8—H80.9300
N1—C111.315 (3)C9—C101.423 (3)
N1—C91.373 (2)C11—C121.417 (3)
N2—N31.321 (2)C13—C181.380 (3)
N2—C21.479 (2)C13—C141.386 (3)
N2—C31.484 (2)C14—C151.386 (3)
C1—C111.497 (3)C14—H140.9300
C1—C21.533 (3)C15—C161.366 (4)
C1—H1A0.9700C15—H150.9300
C1—H1B0.9700C16—C171.372 (4)
C2—C191.512 (3)C16—H160.9300
C2—H20.9800C17—C181.392 (3)
C3—C121.511 (3)C17—H170.9300
C3—C131.524 (3)C18—H180.9300
C3—H30.9800C19—C241.387 (3)
C4—C121.361 (3)C19—C201.388 (2)
C4—C101.402 (3)C20—C211.383 (3)
C4—H40.9300C20—H200.9300
C5—C61.355 (4)C21—C221.377 (3)
C5—C101.414 (3)C21—H210.9300
C5—H50.9300C22—C231.377 (3)
C6—C71.401 (4)C22—H220.9300
C6—H60.9300C23—C241.384 (3)
C7—C81.371 (3)C23—H230.9300
C7—H70.9300C24—H240.9300
C8—C91.404 (3)
C11—N1—C9118.22 (17)C5—C10—C9118.4 (2)
N3—N2—C2121.6 (2)N1—C11—C12123.51 (17)
N3—N2—C3113.4 (2)N1—C11—C1118.72 (17)
C2—N2—C3124.43 (15)C12—C11—C1117.60 (18)
O—N3—N2114.4 (2)C4—C12—C11118.81 (19)
C11—C1—C2115.09 (16)C4—C12—C3121.92 (18)
C11—C1—H1A108.5C11—C12—C3119.25 (17)
C2—C1—H1A108.5C18—C13—C14118.97 (19)
C11—C1—H1B108.5C18—C13—C3122.89 (18)
C2—C1—H1B108.5C14—C13—C3118.12 (18)
H1A—C1—H1B107.5C13—C14—C15121.0 (2)
N2—C2—C19113.48 (16)C13—C14—H14119.5
N2—C2—C1110.02 (15)C15—C14—H14119.5
C19—C2—C1109.79 (15)C16—C15—C14119.4 (2)
N2—C2—H2107.8C16—C15—H15120.3
C19—C2—H2107.8C14—C15—H15120.3
C1—C2—H2107.8C15—C16—C17120.5 (2)
N2—C3—C12110.1 (2)C15—C16—H16119.8
N2—C3—C13111.6 (2)C17—C16—H16119.8
C12—C3—C13114.93 (16)C16—C17—C18120.3 (2)
N2—C3—H3106.6C16—C17—H17119.8
C12—C3—H3106.6C18—C17—H17119.8
C13—C3—H3106.6C13—C18—C17119.8 (2)
C12—C4—C10119.84 (19)C13—C18—H18120.1
C12—C4—H4120.1C17—C18—H18120.1
C10—C4—H4120.1C24—C19—C20118.55 (18)
C6—C5—C10120.8 (2)C24—C19—C2122.24 (16)
C6—C5—H5119.6C20—C19—C2118.91 (17)
C10—C5—H5119.6C21—C20—C19120.2 (2)
C5—C6—C7121.1 (2)C21—C20—H20119.9
C5—C6—H6119.5C19—C20—H20119.9
C7—C6—H6119.5C22—C21—C20120.86 (19)
C8—C7—C6119.7 (2)C22—C21—H21119.6
C8—C7—H7120.1C20—C21—H21119.6
C6—C7—H7120.1C23—C22—C21119.3 (2)
C7—C8—C9120.9 (2)C23—C22—H22120.3
C7—C8—H8119.6C21—C22—H22120.3
C9—C8—H8119.6C22—C23—C24120.1 (2)
N1—C9—C8119.12 (19)C22—C23—H23120.0
N1—C9—C10121.65 (18)C24—C23—H23120.0
C8—C9—C10119.16 (18)C23—C24—C19120.94 (18)
C4—C10—C5123.7 (2)C23—C24—H24119.5
C4—C10—C9117.89 (18)C19—C24—H24119.5
C2—N2—N3—O5.0 (3)N1—C11—C12—C41.1 (3)
C3—N2—N3—O176.1 (2)C1—C11—C12—C4174.12 (17)
N3—N2—C2—C1968.4 (2)N1—C11—C12—C3179.35 (17)
C3—N2—C2—C19121.55 (19)C1—C11—C12—C34.1 (3)
N3—N2—C2—C1168.15 (18)N2—C3—C12—C4148.61 (17)
C3—N2—C2—C11.9 (2)C13—C3—C12—C484.4 (2)
C11—C1—C2—N238.0 (2)N2—C3—C12—C1133.2 (2)
C11—C1—C2—C19163.6 (2)C13—C3—C12—C1193.8 (2)
N3—N2—C3—C12133.87 (17)N2—C3—C13—C18110.5 (2)
C2—N2—C3—C1236.9 (2)C12—C3—C13—C1815.8 (2)
N3—N2—C3—C1397.3 (2)N2—C3—C13—C1471.2 (2)
C2—N2—C3—C1392.0 (2)C12—C3—C13—C14162.57 (17)
C10—C5—C6—C70.6 (4)C18—C13—C14—C150.4 (3)
C5—C6—C7—C80.3 (3)C3—C13—C14—C15178.8 (2)
C6—C7—C8—C90.2 (3)C13—C14—C15—C160.2 (4)
C11—N1—C9—C8175.84 (17)C14—C15—C16—C170.1 (4)
C11—N1—C9—C101.2 (3)C15—C16—C17—C180.6 (4)
C7—C8—C9—N1177.61 (18)C14—C13—C18—C171.0 (3)
C7—C8—C9—C100.5 (3)C3—C13—C18—C17179.34 (18)
C12—C4—C10—C5176.35 (19)C16—C17—C18—C131.2 (3)
C12—C4—C10—C92.8 (3)N2—C2—C19—C2445.2 (2)
C6—C5—C10—C4178.4 (2)C1—C2—C19—C2478.4 (2)
C6—C5—C10—C90.8 (3)N2—C2—C19—C20141.18 (17)
N1—C9—C10—C41.4 (3)C1—C2—C19—C2095.2 (2)
C8—C9—C10—C4178.49 (18)C24—C19—C20—C210.9 (3)
N1—C9—C10—C5177.79 (18)C2—C19—C20—C21173.01 (19)
C8—C9—C10—C50.7 (3)C19—C20—C21—C220.7 (3)
C9—N1—C11—C122.5 (3)C20—C21—C22—C230.6 (4)
C9—N1—C11—C1172.66 (16)C21—C22—C23—C241.5 (3)
C2—C1—C11—N1142.07 (18)C22—C23—C24—C191.3 (3)
C2—C1—C11—C1242.5 (2)C20—C19—C24—C230.1 (3)
C10—C4—C12—C111.7 (3)C2—C19—C24—C23173.79 (18)
C10—C4—C12—C3176.49 (17)

Experimental details

Crystal data
Chemical formulaC24H19N3O
Mr365.42
Crystal system, space groupMonoclinic, P21/a
Temperature (K)293
a, b, c (Å)9.713 (6), 19.265 (8), 10.450 (2)
β (°) 105.74 (3)
V3)1882.1 (14)
Z4
Radiation typeCu Kα
µ (mm1)0.64
Crystal size (mm)0.2 × 0.2 × 0.15
Data collection
DiffractometerEnraf-Nonius CAD-4
diffractometer
Absorption correction
No. of measured, independent and
observed [I > 2σ(I)] reflections
3876, 3435, 2660
Rint0.052
(sin θ/λ)max1)0.601
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.057, 0.172, 1.07
No. of reflections3435
No. of parameters253
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)0.23, 0.20

Computer programs: CAD-4 EXPRESS (Enraf-Nonius, 1994), CAD-4 EXPRESS, XCAD4 (Harms & Wocadlo, 1995), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), ZORTEP (Zsolnai, 1997) and PLATON (Spek, 2000), SHELX97 and PARST (Nardelli, 1995).

Selected geometric parameters (Å, º) top
O—N31.233 (2)N2—C31.484 (2)
N1—C111.315 (3)C1—C111.497 (3)
N1—C91.373 (2)C2—C191.512 (3)
N2—N31.321 (2)C3—C131.524 (3)
N2—C21.479 (2)
N3—N2—C2121.6 (2)N2—C3—C12110.1 (2)
N3—N2—C3113.4 (2)N2—C3—C13111.6 (2)
O—N3—N2114.4 (2)
C2—N2—N3—O5.0 (3)C1—C11—C12—C34.1 (3)
C3—N2—N3—O176.1 (2)C13—C3—C12—C1193.8 (2)
C11—C1—C2—C19163.6 (2)C1—C2—C19—C2478.4 (2)
N1—C11—C12—C41.1 (3)
 

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