Home Crystal structure of (E)-4-((2-fluoro-3-(trifluoromethyl)benzylidene)amino)-3-methyl-1H-1,2,4-triazole-5(4H)-thione, C11H8F4N4S
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Crystal structure of (E)-4-((2-fluoro-3-(trifluoromethyl)benzylidene)amino)-3-methyl-1H-1,2,4-triazole-5(4H)-thione, C11H8F4N4S

  • Mohamed Reda Aouad EMAIL logo , Mouslim Messali , Nadjet Rezki , Abdelkader Zarrouk and Ismail Warad EMAIL logo
Published/Copyright: December 7, 2018

Abstract

C11H8F4N4S, monoclinic, P21/c (no. 14), a = 4.4773(4) Å, b = 4.1089(11) Å, c = 20.1449(16) Å, β = 95.425(4)°, V = 1266.85(18) Å3, Z = 4, Rgt(F) = 0.0383, wRref(F2) = 0.1176, T = 273(2) K.

CCDC no.: 1869705

The asymmetric unit of the title crystal structure is shown in the figure. Tables 1 and 2 contain details on crystal structure

Table 1:

Data collection and handling.

Crystal:Colourless block
Size:0.27 × 0.25 × 0.22 mm
Wavelength:Cu Kα radiation (1.54178 Å)
μ:2.73 mm−1
Diffractometer, scan mode:Bruker X8 Prospector APEX-II,
θmax, completeness:67.2°, 99%
N(hkl)measured, N(hkl)unique, Rint:19933, 2239, 0.041
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1920
N(param)refined:182
Programs:Bruker [1], SHELX [2, 3] , Olex2 [4]
Table 2:

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

AtomxyzUiso*/Ueq
F00.4372(3)0.44835(8)0.25276(6)0.0739(4)
S11.12989(14)0.49484(4)0.40955(3)0.0806(3)
F1−0.0909(3)0.46474(11)0.17394(8)0.0922(5)
F20.2600(3)0.46174(11)0.10948(7)0.0910(5)
F3−0.1212(3)0.37171(13)0.09074(8)0.1029(5)
N11.4424(4)0.36895(13)0.48894(9)0.0706(5)
H11.53690.41260.51220.085*
N21.4923(4)0.27423(14)0.50090(9)0.0705(5)
N31.1452(3)0.29822(11)0.41752(7)0.0550(4)
N40.9438(4)0.26523(12)0.36596(8)0.0589(4)
C11.2355(4)0.38815(14)0.43840(10)0.0598(5)
C21.3105(5)0.23221(15)0.45667(10)0.0619(5)
C30.7799(4)0.32394(15)0.33195(10)0.0602(5)
H30.78880.38810.34260.072*
C40.5765(4)0.29044(14)0.27588(9)0.0548(4)
C50.4121(4)0.35589(14)0.23676(9)0.0548(4)
C60.2257(4)0.33152(14)0.18070(9)0.0573(5)
C70.1981(5)0.23676(16)0.16425(11)0.0719(6)
H70.07240.21830.12710.086*
C80.3564(6)0.16922(17)0.20271(12)0.0811(7)
H80.33630.10550.19140.097*
C90.5441(5)0.19564(15)0.25783(11)0.0684(6)
H90.65020.14950.28320.082*
C101.2794(6)0.12916(16)0.44686(13)0.0832(7)
H10A1.07630.11060.45180.125*
H10B1.41260.09680.47950.125*
H10C1.32900.11280.40300.125*
C110.0687(5)0.40661(17)0.13883(11)0.0680(6)

and measurement conditions and a list of the atoms including atomic coordinates and displacement parameters.

Source of material

Preparation: 1 mmol of 2-fluoro-3-(trifluoromethyl)benzaldehyde and 1 mmol 4-amino-3-methyl-1H-1,2,4-triazole-5(4H)-thione was mixed in 100 mL ethanol; then refluxed for 6 h. The reaction mixture was left to stand for 2 days in an open beaker. When the solvent was almost evaporated a crystalline product appeared, which was filtrated and washed with 100 mL of diethyl ether.

Experimental details

Hydrogen atoms were placed at the calculated positions and refined using a riding model with Uiso(H) = 1.2Ueq or 1.5Ueq of the adjacent non-hydrogen atom. H3 Atom position was localized from the difference map and refined with DFIX 0.87 and Uiso(H) = 1.5Ueq(O3).

Comment

Schiff bases are N-ligands owing a (>C=N-) azomethine functional group which were reported by Hugo Schiff in 1864 [5]. They can be prepared via condensation of a primary amine with ketone or aldehyde compounds, and generally take place under acid catalysis or without catalysts [6]. Schiff bases are useful chelators because of their structural varieties, ease of preparation, and electronic controlling [7]. These ligands coordinate ions via the N-imine and some cases the O-carbonyl to form very stable complexes [5], [6], [7]. The azomethine moiety is involved in essential biological activity and interferes in cell processes. Therefore Schiff-base complexes could be promising medicinal materials due to their diverse pharmacological applications [6], [7], [8], [9].

The molecule crystallizes monoclinically, space group P21/c. According to the results of the single crystal diffraction the thione tautomeric structure was found to be favored over the thiol tautomeric one as seen in the figure. The plane of the aryl ring makes a dihedral angle of 0.6° with the plane of the 1,2,4-triazole ring indicating the exo-isomer favoured over the endo-one. The molecule exhibits one N—H⋯S classical hydrogen with 2.444 Å. No π–π stacking interactions were detected in the crystal.

References

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Received: 2018-09-30
Accepted: 2018-11-12
Published Online: 2018-12-07
Published in Print: 2019-03-26

©2019 Mohamed Reda Aouad et al., published by De Gruyter, Berlin/Boston

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

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