Home Physical Sciences Crystal structure of the triclinic modification of 1-methyl-4-nitroimidzole, C4H5N3O2
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Crystal structure of the triclinic modification of 1-methyl-4-nitroimidzole, C4H5N3O2

  • Wang Jianlong EMAIL logo , Lian Pengbao and Chen Lizhen
Published/Copyright: May 26, 2017

Abstract

C4H5N3O2, triclinic, P1 (no. 1), a = 3.8976(6) Å, b = 5.7235(8) Å, c = 6.2670(10) Å, α = 89.630(12)°, β = 84.800(13)°, γ = 76.970(13)°, V = 135.63(4) Å3, Z = 1, Rgt(F) = 0.0519, wRref(F2) = 0.1303, T = 104.8 K.

CCDC no.:: 1549000

The asymmetric unit of the title crystal structure is shown in the figure. Tables 1 contains details on crystal structure and measurement conditions. Tables 2 lists the atoms with their coordinates and displacement parameters.

Table 1

Data collection and handling.

Crystal:Colourless block
Size:0.40 × 0.13 × 0.05 mm
Wavelength:Mo Kα radiation (0.7107 Å)
μ:1.3 cm−1
Diffractometer, scan mode:Xcalibur Eos Gemini, ω-scans
2θmax, completeness:52.0°, 99%
N(hkl)measured, N(hkl)unique, Rint:1610, 1062, 0.032
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1018
N(param)refined:83
Programs:CrysAlisPRO [1], SHELX [2], OLEX2 [3]
Table 2

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

AtomxyzUiso*/Ueq
N2−0.4443(6)−0.1521(5)−0.5265(4)0.0210(6)
N3−0.1740(6)−0.0846(4)−0.2030(4)0.0226(6)
O1−0.0785(6)0.0609(4)−0.0913(3)0.0292(6)
O2−0.1321(6)−0.3008(4)−0.1614(4)0.0344(6)
C3−0.4190(7)0.2372(5)−0.4574(5)0.0207(6)
H3−0.37480.3743−0.39010.025*
N1−0.5720(6)0.2260(4)−0.6438(4)0.0199(6)
C4−0.7062(8)0.4237(5)−0.7864(5)0.0247(7)
H4A−0.50990.4916−0.84700.037*
H4B−0.88200.5482−0.70480.037*
H4C−0.81620.3631−0.90250.037*
C1−0.5821(7)−0.0088(5)−0.6771(5)0.0223(6)
H1−0.6785−0.0626−0.79660.027*
C2−0.3441(7)0.0029(5)−0.3899(5)0.0194(7)

Source of material

The title compound was prepared by nitration of 1-methylimidzole. The title compound was recrystallized from ethyl acetate solution at room temperature to give colorless crystals suitable for single-crystal X-ray diffraction.

Experimental details

All hydrogen atoms were identified in difference Fourier syntheses. The coordinates of the H-atoms at the imidzole ring and methyl group were refined with the C—H distance fixed to 0.95° and 0.98 Å, respectively. The Uiso values of the hydrogen atoms of methyl groups were set to 1.5Ueq(C) and the Uiso values of the hydrogen atoms of imidzole ring were set to 1.2Ueq(C).

Discussion

Nitro derivatives of imidazole have attracted attention in conjunction with their favorable detonation performance [4, 5] . Especially, 1-methyl-2,4,5-trinitroimidazole is an energetic compound with good performance [6, 7] . In order to study the mechanism of synthesis of 1-methyl-2,4,5-trinitroimidazole, the title compound was prepared by the nitration of 1-methylimidazole. The title compound was crystallized to determine the position of the nitro group by means of X-ray diffraction.

As shown in the figure, the molecular structure, contains a planar imidzole ring to which the nitro group is linked in C2 position. The nitro group is almost in the same plane as the imidazole ring due to conjugation.

All bond lengths and angels are in the expected ranges and agree with those derived from the crystal structure of the monoclinic polymorph of this compound [8].

Acknowledgement

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

References

1 Agilent Technologies: CrysAlis PRO Software system, version 1.171.35.15. Agilent Technologies UK Ltd, Oxford, UK (2011).Search in Google Scholar

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3 Dolomanov, O. V.; Bourhis, L. J.; Gildea, R. J.; Howard, J. A. K.; Puschmann, H.: OLEX2: a complete structure solution, refinement and analysis program. J. Appl. Cryst. 42 (2009) 339–341.10.1107/S0021889808042726Search in Google Scholar

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Received: 2017-2-1
Accepted: 2017-5-10
Published Online: 2017-5-26
Published in Print: 2017-7-26

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

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

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  61. Corrigendum
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