Home The crystal structure of 4-(2,4-dichlorophenyl)-2-(4-fluorophenyl)-5-methyl-1H-imidazole, C16H11Cl2FN2
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The crystal structure of 4-(2,4-dichlorophenyl)-2-(4-fluorophenyl)-5-methyl-1H-imidazole, C16H11Cl2FN2

  • Yiting Li , Xiaochun Zhang , Xingshang Weng and Xuewen Zhuang ORCID logo EMAIL logo
Published/Copyright: August 1, 2023

Abstract

C16H11Cl2FN2, orthorhombic, Pbca (no. 61), a = 9.6732(3) Å, b = 15.5602(5) Å, c = 19.0881(6) Å, V = 2873.08(16) Å3, Z = 8, Rgt(F) = 0.0361, wRref(F2) = 0.0958, T = 193 K.

CCDC no.: 2271252

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: White block
Size: 0.13 × 0.12 × 0.10 mm
Wavelength: GaKα radiation (1.34139 Å)
μ: 2.72 mm−1
Diffractometer, scan mode: Bruker D8 VENTURE Metaljet PHOTON II, φ and ω
θmax, completeness: 60.2°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 21,290, 3187, 0.034
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 2676
N(param)refined: 191
Programs: Bruker [1], Olex2 [2], Shelx [3, 4]
Table 2:

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

Atom x y z Uiso*/Ueq
C1 0.37982 (18) 0.71881 (11) 0.67183 (9) 0.0254 (4)
H1 0.320198 0.716760 0.711347 0.030*
C2 0.3451 (2) 0.76974 (12) 0.61494 (10) 0.0303 (4)
H2A 0.261626 0.801866 0.614609 0.036*
C3 0.4344 (2) 0.77267 (12) 0.55907 (10) 0.0309 (4)
C4 0.5554 (2) 0.72626 (13) 0.55657 (10) 0.0322 (4)
H4 0.614906 0.729539 0.517068 0.039*
C5 0.58778 (18) 0.67469 (12) 0.61326 (9) 0.0280 (4)
H5 0.670241 0.641547 0.612401 0.034*
C6 0.50133 (16) 0.67052 (11) 0.67173 (9) 0.0210 (3)
C7 0.53886 (16) 0.61660 (11) 0.73151 (8) 0.0202 (3)
C8 0.45144 (18) 0.50648 (13) 0.89341 (9) 0.0291 (4)
H8A 0.449078 0.548851 0.931372 0.044*
H8B 0.502632 0.455541 0.908861 0.044*
H8C 0.356782 0.489992 0.880981 0.044*
C9 0.52105 (16) 0.54453 (11) 0.83113 (8) 0.0213 (3)
C10 0.65103 (16) 0.53515 (11) 0.80352 (8) 0.0200 (3)
C11 0.76826 (16) 0.48138 (11) 0.82622 (9) 0.0210 (3)
C12 0.82737 (18) 0.42600 (11) 0.77729 (9) 0.0256 (4)
H12 0.787086 0.422142 0.732011 0.031*
C13 0.94261 (19) 0.37635 (12) 0.79211 (10) 0.0300 (4)
H13 0.981818 0.339837 0.757521 0.036*
C14 0.99907 (18) 0.38131 (12) 0.85849 (10) 0.0288 (4)
C15 0.94334 (18) 0.43371 (11) 0.90933 (10) 0.0268 (4)
H15 0.982446 0.435620 0.954953 0.032*
C16 0.82888 (17) 0.48374 (11) 0.89273 (9) 0.0223 (3)
Cl1 0.76681 (5) 0.55241 (3) 0.95703 (2) 0.03110 (13)
Cl2 1.14429 (5) 0.31997 (4) 0.87839 (3) 0.04310 (16)
F1 0.40097 (15) 0.82401 (8) 0.50387 (6) 0.0471 (3)
N1 0.66163 (13) 0.58027 (9) 0.74103 (7) 0.0212 (3)
N2 0.45240 (13) 0.59719 (9) 0.78538 (7) 0.0214 (3)
H2 0.366766 0.615394 0.790066 0.026*

1 Source of material

Add 4-fluorobenzamidine hydrochloride (2.02 g, 10.0 mmol), 2,4-dichlorophenylacetone (1.75 g, 10.0 mmol), K2CO3 (1.52 g, 1.1 equivalent), and dry EtOH (60 mL) in an oven dried 100 mL round bottom flask. Stir the reaction mixture for 12 h at 75 °C. Monitor the reaction progress by TLC. After completion of the reaction evaporate the excess EtOH in a rotary evaporator. Dilute the crude reaction mixture with water (60 mL). Extract the reaction mixture with DCM. Dry the organic layer over anhydrous Na2SO4. Remove the organic layer through evaporation under a vacuum. Purify the residue by column chromatography to yield 4-(2,4-dichlorophenyl)-2-(4-fluorophenyl)-5-methyl-4,5-dihydro-1H-imidazole as white solid 2.74 g, 85 %. (hexane/ethyl acetate as eluent). The product was dissolved in the mixed solvent (methanol: ethyl acetate = 1:1) and stored at 6 °C to provide white needle crystals.

2 Experimental details

Using Olex2 [2], the structure was solved with the Shelxt [3] structure solution program and refined with the Shelxl [4] refinement package.

3 Comment

Imidazoles are widely used in the various fields such as pharmaceutical industry [5], polymer industry [6], material science [7] and so on. Currently, imidazole and its derivatives are the most commonly used substances in printed circuit boards (PCBs) for protecting copper against oxidation in the presence of water and salt in the air. This is achieved through the formation of an organic solderability preservative (OSP) film on the surface of the copper [8], [9], [10]. The self-assembling ability of imidazole is attributed to its orderly coordinating ability of nitrogen-containing heterocycles on copper surfaces.

The crystal structure mentioned in the title is formed by molecules that exhibit characteristic bonds, including C7–N1, C7–N2, and C9–C10. The lengths of these bonds are 1.328(2), 1.359(2), and 1.371(2) Å, respectively. The angle formed by C16–C11–N1 is 139.3 °C, which was probably influenced by the steric hindrance of the C8–C9 bond [11]. The bond lengths and angles are in the expected ranges.


Corresponding author: Xuewen Zhuang, Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou, Guangdong 510665, P.R. China, E-mail:

Funding source: GuangDong Basic and Applied Basic Research Foundation

Award Identifier / Grant number: 2022A1515110983

Funding source: Science and Technology Program of Guangzhou, China

Award Identifier / Grant number: 202201010309

Funding source: Key Research and Development Program of Guangzhou

Award Identifier / Grant number: 20220602JBGS02

Funding source: Research on Key Technologies and Applications of Cutting-Edge New Materials in Emerging Strategic Industry Clusters

Award Identifier / Grant number: 2022GDASZH-2022010109

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

  2. Research funding: This study was supported by GuangDong Basic and Applied Basic Research Foundation (2022A1515110983), Science and Technology Program of Guangzhou, China (202201010309), Key Research and Development Program of Guangzhou (20220602JBGS02), and Research on Key Technologies and Applications of Cutting-Edge New Materials in Emerging Strategic Industry Clusters (2022GDASZH-2022010109).

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

References

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Received: 2023-06-24
Accepted: 2023-07-19
Published Online: 2023-08-01
Published in Print: 2023-10-26

© 2023 the author(s), published by De Gruyter, Berlin/Boston

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

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