Home Physical Sciences The crystal structure of methyl N-(4-bromophenyl)carbamate, C8H8BrNO2
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The crystal structure of methyl N-(4-bromophenyl)carbamate, C8H8BrNO2

  • Zbigniew Karczmarzyk EMAIL logo , Monika Pitucha , Waldemar Wysocki , Maja Morawiak , Karolina Sobótka-Polska and Zofia Urbańczyk-Lipkowska
Published/Copyright: September 16, 2017

Abstract

C8H8BrNO2, orthorhombic, Pbca (no. 61), a = 10.1313(3) Å, b = 8.5416(4) Å, c = 20.4597(7) Å, V = 1770.53(12) Å3, Z = 8, Rgt(F) = 0.0394, wRref(F2) = 0.1214, T = 296 K.

CCDC no.:: 1571273

The asymmetric unit of the title crystal structure is 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:Cubes, colourless
Size:0.60 × 0.57 × 0.41 mm
Wavelength:Cu Kα radiation (1.54178 Å)
μ:6.01 mm−1
Diffractometer, scan mode:Bruker APEXII, φ and ω
2θmax, completeness:68.6°, >99%
N(hkl)measured, N(hkl)unique, Rint:31984, 1615, 0.157
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1387
N(param)refined:113
Programs:Bruker [1], SIR92 [2], SHELX [3], ORTEP, WinGX [4]
Table 2

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

AtomxyzUiso*/Ueq
Br10.05084(4)0.21611(6)0.75316(2)0.0706(3)
O2−0.00847(19)−0.2979(3)0.48416(11)0.0610(6)
O30.18764(18)−0.3619(4)0.44039(12)0.0735(7)
N10.1858(2)−0.2062(3)0.52492(15)0.0579(7)
H10.256(5)−0.221(5)0.520(2)0.087*
C20.1099(3)−0.2891(4)0.48368(14)0.0514(7)
C40.1238(3)−0.4590(5)0.39248(18)0.0788(11)
H410.1892−0.50470.36430.118*
H420.0756−0.54060.41410.118*
H430.0642−0.39670.36700.118*
C110.1474(2)−0.1122(4)0.57745(14)0.0492(6)
C120.0181(3)−0.0686(4)0.59023(16)0.0584(7)
H12−0.0499−0.10410.56360.088*
C13−0.0093(3)0.0279(4)0.64274(16)0.0597(8)
H13−0.09600.05670.65140.090*
  1. aOccupancy: 0.854(7).

Source of material

The title compound was prepared by the following method: The mixture of cyanoacetic acid hydrazide (0.01 mol), 4-bromophenyl isocyanate (0.01 mole) and methanol (15 mL) was heated with reflux for 0.5 h. After cooling the solution, the precipitated compound was filtered and crystallized from methanol. Crystals were grown by slow evaporation of an ethanol solution.

Experimental details

The N-bound H atom was located by difference Fourier synthesis and refined freely. The remaining H atoms were positioned geometrically and treated as riding on their parent C atoms with C—H distances of 0.96 Å (CH3) and 0.93 Å (aromatic). All H atoms were refined with isotropic displacement parameters taken as Uiso(H) = 1.5Ueq(C,N) in refinement procedure.

Discussion

The title compound was prepared as a part of our study on the synthesis of novel semicarbazide derivatives as potential anti-microbial agents [5]. We expected to receive 1-cyanoacetylo-4-(4-bromophenyl)semicarbazide in the reaction of cyanoacetic acid hydrazide, 4-bromophenyl isocyanate and methanol according to the literature data [6], but during the reaction methyl N-(4-bromophenyl)carbamate was obtained. We suppose that instead of the isocyanate reaction with the hydrazide, the isocyanate reacted with the methanol, which was the reaction medium giving the title compound.

The molecule is nearly planar with the mean planes of the benzene ring and carbamate group twisted relative to each other by an angle of 9.69(12)°. The bond lengths and angles have normal values and they are in good agreement with those observed in related structures of methyl N-(4-chlorophenyl)carbamate [7] and methyl N-(4-nitrophenyl)carbamate [8].

In the crystal structure of the title compound, molecules related by 21 symmetry axis are linked into chains parallel to [100] direction via N1—H1⋯O2i hydrogen bonds [N1—H1 = 0.73(5) Å, H1⋯O2 = 2.39(5) Å, N1⋯O2 = 3.103(3) Å, N1—H1—O2 = 165(4)° and i = 1/2 + x, 1/2 − y, −z]. Moreover, the molecules related by centre of inversion form dimers through non-classical, very weak C4—H42⋯O2ii hydrogen bonds [C4—H42 = 0.96 Å, H42⋯O2 = 2.59 Å, C42⋯O2 = 3.471(4) Å, C4—H42—O2 = 153° and ii = 1 − x, 1 − y, −z]. The combination of these two intermolecular motifs gives hydrogen bonding molecular planes parallel to (010) net plane.

References

Bruker. APEX2 (Version 2.1.4), SAINT (Version 7.34A) and SADABS (Version 2004/1). Bruker AXS Inc., Madison, Wisconsin, USA (2005).Search in Google Scholar

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Sheldrick, G. M.: A short history of SHELX. Acta Crystallogr. A64 (2008) 112–122.10.1107/S0108767307043930Search in Google Scholar PubMed

Farrugia, L. J.: WinGX and ORTEP for windows: an update. Appl. Cryst. 45 (2012) 849–854.10.1107/S0021889812029111Search in Google Scholar

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Received: 2017-4-28
Accepted: 2017-8-29
Published Online: 2017-9-16
Published in Print: 2017-11-27

©2017 Zbigniew Karczmarzyk et al., published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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