Home Physical Sciences The crystal structure of 4-chloro-3,5-dinitroaniline, C6H4ClN3O4
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The crystal structure of 4-chloro-3,5-dinitroaniline, C6H4ClN3O4

  • Wang Jianlong EMAIL logo , Zhang Tianbei and Chen Lizhen
Published/Copyright: February 25, 2017

Abstract

C6H4ClN3O4, monoclinic, Cc (no. 9), a = 14.1945(7) Å, b = 8.1107(3) Å, c = 15.3834(6) Å, β = 115.472(6)°, V = 1598.90(12) Å3, Z = 8, Rgt(F) = 0.0269, wRref(F2) = 0.0669, T = 105.6 K.

CCDC no.:: 1528750

The two crystallographically independent molecules of the title crystal structure are shown in the figure. Tables 1 and 2 contain details on crystal structure and measurement conditions and a list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Brownish red block
Size:0.50 × 0.35 × 0.08 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:4.7 cm−1
Diffractometer, scan mode:Xcalibur, ω-scans
2θmax, completeness:52°, >99%
N(hkl)measured, N(hkl)unique, Rint:6746, 2817, 0.025
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 2743
N(param)refined:253
Programs:CrysAlisPRO [1], SHELX [2], OLEX2 [3]
Table 2:

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

AtomxyzUiso*/Ueq
Cl1−0.27657(4)−0.20277(6)−0.21736(4)0.01674(14)
O5−0.31206(14)−0.3147(2)0.03255(12)0.0200(4)
O3−0.08117(14)−0.2233(2)−0.24315(12)0.0188(4)
O4−0.31047(15)−0.1024(2)−0.05187(14)0.0229(4)
O1−0.04694(14)−0.4856(2)−0.22877(12)0.0207(4)
N1−0.07356(15)−0.3566(2)−0.20375(13)0.0143(4)
N30.04874(16)−0.5335(3)0.12546(13)0.0197(5)
H3A0.1034−0.57260.12210.024*
H3B0.0422−0.54050.17840.024*
N2−0.27819(15)−0.2369(2)−0.01607(13)0.0142(4)
C3−0.01844(19)−0.4478(3)−0.04011(15)0.0134(5)
H30.0381−0.4959−0.04580.016*
C2−0.09293(18)−0.3644(3)−0.11685(15)0.0119(5)
C4−0.02805(18)−0.4600(3)0.04634(15)0.0131(5)
C1−0.18116(19)−0.2901(3)−0.11618(16)0.0120(5)
C6−0.18946(19)−0.3083(3)−0.02876(16)0.0122(5)
C5−0.11649(18)−0.3898(3)0.04997(15)0.0133(5)
H5−0.1260−0.39840.10600.016*
Cl2−0.27376(4)−0.67217(6)−0.23098(4)0.01614(13)
O6−0.00013(15)−0.8617(2)−0.22916(12)0.0220(4)
O9−0.25860(15)−0.6992(2)0.05115(12)0.0251(4)
O8−0.36188(14)−0.7317(2)−0.09930(13)0.0245(4)
O7−0.16757(15)−0.8849(2)−0.31063(11)0.0209(4)
N60.05061(16)−1.0357(2)0.09724(13)0.0167(4)
H6A0.1020−1.08040.09050.020*
H6B0.0475−1.04060.15180.020*
N5−0.27561(16)−0.7382(2)−0.03103(14)0.0165(4)
N4−0.08922(17)−0.8693(2)−0.23525(14)0.0159(4)
C7−0.18559(18)−0.7890(3)−0.13825(16)0.0120(5)
C10−0.02612(18)−0.9566(3)0.02117(16)0.0124(5)
C12−0.18703(19)−0.8014(3)−0.04777(17)0.0127(5)
C9−0.02283(19)−0.9469(3)−0.06826(16)0.0129(5)
H90.0318−0.9958−0.07680.016*
C8−0.10028(18)−0.8649(3)−0.14372(16)0.0125(5)
C11−0.11030(19)−0.8806(3)0.03037(16)0.0135(5)
H11−0.1145−0.88350.08900.016*

Source of material

The title compound was prepared from 4-chloro-3,5-dinitrobenzoic acid by a Schmidt reaction. It was recrystallized from ethyl acetate to give brownish-red crystals suitable for single-crystal X-ray diffraction.

Experimental details

All H atoms were positioned geometrically and treated as riding, with C—H bond lengths constrained to 0.93 Å, and refined as ride with Uiso(H) = 1.2 Ueq(C). The N—H bond lengths were constrained to 0.86 Å, and refined as ride with Uiso(H) = 1.5–1.8 Ueq(N).

Discussion

Polynitroaryl compounds play an important role in energetic material area [4], [5]. The thermal stability of explosive molecules can be achieved by the introduction of amino groups at the aromatic ring [6], [7], [8]. 4-Chloro-3,5-dinitroaniline is an important precursor with the amino groups and nitroaryl for the synthesis of the derivatives of 2,2′,3,3′,5,5′,6,6′-octanitroazo-benzene (DCONAB), which is a kind of new thermally stable insensitive high explosive [9, 10] . According to our research, the melting point of 4-chloro-3,5-dinitroaniline is 481.2 K, apparently different from the result taken from the literature [9], which should be 461.2 K. In order to confirm the molecular structure single crystals were grown and X-ray diffraction experiment was completed.

As shown in figure two crystallographically independent, 4-chloro-3,5-dinitroaniline molecules are present in the asymmetric unit. The two rings are approximately parallel. Owing to space steric effect, the dihedral angle of the nitro groups and their parent rings are 47.2° (N1/O2,O3), 37.8° (N2/O2,O5), 36.7 (N4/O6,O7) and 28.8° (N5/O8,O9), respectively.

Acknowledgement

We thank the Center of Testing and Analysis, Beijing University of Chemical Technoly, for support.

References

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Received: 2016-7-22
Accepted: 2017-1-21
Published Online: 2017-2-25
Published in Print: 2017-3-1

©2017 Wang Jianlong et al., published by De Gruyter.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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