Home The crystal structure of 1-bromo-4-iodo-benzene, C6H4BrI
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The crystal structure of 1-bromo-4-iodo-benzene, C6H4BrI

  • Eric C. Hosten ORCID logo and Richard Betz ORCID logo EMAIL logo
Published/Copyright: November 12, 2020

Abstract

C6H4BrI, monoclinic, P21/c (no. 14), a = 4.1704(6) Å, b = 5.8242(8) Å, c = 14.929(2) Å, β = 97.315(5)°, V = 359.67(9) Å3, Z = 2, Rgt(F) = 0.0303, wRref(F2) = 0.0982, T = 200 K.

CCDC no.: 2041503

The molecular structure is shown in the Figure. Table 1 contains crystallographic data, and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal:Colourless platelet
Size:0.55 × 0.44 × 0.18 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:9.90 mm−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω
θmax, completeness:28.0°, 99%
N(hkl)measured, N(hkl)unique, Rint:2943, 865, 0.042
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 741
N(param)refined:47
Programs:Bruker [1], [, 2], SHELX [3], WinGX/ORTEP [4], Mercury [5], PLATON [6]
Table 2:

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

AtomxyzUiso*/Ueq
C10.6450 (12)0.3659 (8)0.5698 (4)0.0351 (10)
C20.4980 (13)0.5681 (9)0.5891 (3)0.0386 (11)
H20.4969180.6140450.6501510.046*
C30.3519 (14)0.7046 (9)0.5201 (4)0.0404 (12)
H30.2505140.8445920.5332020.049*
I1a0.862 (2)0.1563 (17)0.6714 (5)0.0347 (9)
Br1a0.843 (3)0.184 (3)0.6651 (8)0.0348 (13)
  1. aOccupancy: 0.5.

Source of material

The compound was obtained commercially (Fluka). Crystals suitable for the diffraction study were obtained upon free evaporation of a solution of the compound in acetone.

Experimental details

Carbon-bound H atoms were placed in calculated positions (C–H 0.95 Å) and were included in the refinement in the riding model approximation, with U(H) set to 1.2Ueq(C).

The two halogen atoms show orientational disorder over two positions that has been resolved by a 1:1 distribution model.

Comment

Benzene is one of the most important synthons in chemistry. Via electrophilic substitution reactions a vast variety of functionalized derivatives is readily available. The interplay between activating and deactivating substituents as well as the competition and synergism between inductive and mesomeric effects allows for benzene’s seemingly endless functionalization. The later gives rise to a large toolbox of new synthons that can be applied for the production of dyes, medications, catalysts and ligands for novel coordination compounds. At the beginning of a synthesis of a specific aromatic ligand and in continuation of our interest in the structures of halogenated derivatives of benzene [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], the structure of the title compound was determined. The structure of the latter has been determined previously [17]; however, the chosen technique of powder diffraction precluded the availability of 3D coordinates. Furthermore, structural information about the title compound as a ligand in a ruthenium coordination compound [18] as well as a co-crystallizate with a derivative of pyridine [19] is available.

The title structure shows the presence of a para-substituted derivative of benzene featuring a bromo as well as an iodo substituent. The asymmetric unit consists of half a molecule. The two halogen atoms show orientational disorder over their two positions. The carbon-halogen bond lengths of 1.879(15) Å and 2.064(11)° for bromine and iodine, respectively, are in good agreement with other bromophenyl and iodophenyl compounds whose metrical parameters have been deposited with the Cambridge Structural Database [20]. Intracyclic C–C–C angles are found in a very narrow range of 119.2(5)–120.6(5)°.

In the crystal, dispersive halogen…halogen contacts are observed whose range falls up to more than 0.1 Å below the sum of van-der-Waals radii of the atoms participating in them. These connect the molecules to undulated sheets along [1 0 1/2]. π-Stacking is not a prominent feature in the crystal structure of the title compound as the shortest distance between two centers of gravity was measured at 4.170(3) Å which corresponds to the length of one of the unit cell’s axes.

It is pertinent to point out that the cell constants found in the present study deviate from the values obtained by means of powder diffraction [17].


Corresponding author: Dr Richard Betz, Department of Chemistry, Nelson Mandela University, Summerstrand Campus (South), University Way, Summerstrand, PO Box 77000, Port Elizabeth 6031, South Africa, E-mail:

Funding source: National Research Foundation

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: National Research Foundation.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-10-03
Accepted: 2020-10-30
Published Online: 2020-11-12
Published in Print: 2021-01-26

© 2020 Eric C. Hosten and Richard Betz, published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

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