Home Crystal structure of 2-acetylpyrrole S-methylthiosemicarbazonium hydroiodide, C8H13IN4S
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Crystal structure of 2-acetylpyrrole S-methylthiosemicarbazonium hydroiodide, C8H13IN4S

  • Hao Wu , Kai Kou , Shu-Yang Liu and Yuan Wang EMAIL logo
Published/Copyright: October 27, 2017

Abstract

C8H13IN4S, monoclinic, P21/n (no. 14), a = 5.9563(4) Å, b = 12.8592(8) Å, c = 16.1795(10) Å, β = 99.450(1)°, V = 1222.42(14) Å3, Z = 4, Rgt(F) = 0.0228, wRref(F2) = 0.0535, T = 296 K.

CCDC no.: 1578708

The asymmetric unit of the title crystal structure is shown in the upper part of the figure, whereas the hydrogen bonding scheme is shown in the lower part. 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:Yellow block
Size:0.15 × 0.15 × 0.10 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:2.76m−1
Diffractometer, scan mode:Bruker APEX-II, φ and ω-scans
2θmax, completeness:25°, >99%
N(hkl)measured, N(hkl)unique, Rint:6139, 2146, 0.020
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1880
N(param)refined:127
Programs:Bruker programs [1], SHELX [2]
Table 2

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

AtomxyzUiso*/Ueq
I1−0.08624(4)0.340072(15)0.093888(12)0.04865(9)
S1−0.04359(14)0.22772(6)0.32909(6)0.0537(2)
N10.8020(4)−0.04470(18)0.23107(15)0.0439(6)
H10.7559−0.04840.27860.053*
N20.4354(4)0.07985(18)0.23997(14)0.0386(5)
N30.2459(4)0.14077(17)0.24625(15)0.0398(5)
H30.18150.17790.20490.048*
N40.2524(4)0.0743(2)0.37718(15)0.0484(6)
H4A0.35870.03200.36950.058*
H4B0.20110.07390.42390.058*
C10.9810(5)−0.0976(2)0.2104(2)0.0526(8)
H1A1.0730−0.14390.24480.063*
C21.0037(5)−0.0716(3)0.1311(2)0.0566(9)
H21.1131−0.09660.10120.068*
C30.8312(5)0.0002(3)0.1024(2)0.0531(8)
H3A0.80640.03190.05010.064*
C40.7054(5)0.0154(2)0.16527(17)0.0393(6)
C50.5086(5)0.0802(2)0.16959(17)0.0371(6)
C60.4087(5)0.1408(3)0.09352(19)0.0527(8)
H6A0.49440.12760.04930.079*
H6B0.41420.21370.10660.079*
H6C0.25340.12000.07590.079*
C70.1689(5)0.1393(2)0.31804(18)0.0379(6)
C8−0.1612(6)0.1736(3)0.4149(2)0.0559(9)
H8A−0.28310.21710.42680.084*
H8B−0.04500.16980.46350.084*
H8C−0.21850.10510.40030.084*

Source of material

Thiosemicarbazide (0.091 g, 1 mmol) and iodomethane (0.142 g, 1 mmol) were dissolved in an ethanol solution (10 mL). The mixture was stirred for 1 h under refluxing, and then 2-acetylpyrrole (0.109 g, 1 mmol) was added. The resulting solution was stirred for another 2 h under the same conditions, and then left in air for a few days, yielding yellow block-shaped crystals.

Experimental details

The hydrogen atoms were placed at calculated positions and refined as riding atoms with isotropic displacement parameters.

Discussion

In the past few decades, thiosemicarbazones (TSCs) and their metal complexes have been of interest to chemists and biologists because of their wide range of pharmacological effects [3, 4] . Our previous work shows that several TSC bearing pyrrole units have potential antitumor activity [5]. As part of our ongoing studies on TSCs, the title compound was synthesized and characterized by X-ray diffraction.

In the title structure, there are one protonated thiosemicarbazone molecule and one iodide anion in the asymmetric unit. The bond length of C7—N3 of the thiosemicarbazone moeity is 1.317(4) Å, which is quite shorter than that of the normal C—N bond, while slightly longer than that of the common C = N bond. This fact indicates that the C7—N3 should be a double bond and the N3 atoms may be protonated. In the crystal, intermolecular N—H⋯I hydrogen bonds between all terminal N—H donors of the title cation and the iodide anions link them into a 2D supermolecular network. The geometric parameters of the title cation are in the expected ranges [6]. The same is true for the N—H⋯I hydrogen bonds of a cation with NH2 and NH functionality both connected to the iodide counter anions [7].

References

Bruker: APEX2, SAINT, and SADABS. Bruker AXS Inc., Madison, WI, USA (2009).Search in Google Scholar

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

Palanimuthu, D.; Shinde, S. V.; Somasundaram, K.; Samuelson, A. G.: In vitro and in vivo anticancer activity of copper bis(thiosemicarbazone) complexes. J. Med. Chem. 56 (2013) 722–734.10.1021/jm300938rSearch in Google Scholar PubMed

Matesanz, A. I.; Leitao, I.; Souza, P.: Palladium(II) and platinum(II) bis(thiosemicarbazone) complexes of the 2,6-diacetylpyridine series with high cytotoxic activity in cisplatin resistant A2780cisR tumor cells and reduced toxicity. J. Inorg. Biochem. 125 (2013) 26–31.10.1016/j.jinorgbio.2013.04.005Search in Google Scholar PubMed

Li, X.-J.; Mao, P.-D.; Wu, W.-N.; Kou, K.; Liu, S.-Y.; Wang, Y.: Ni(II)/Cu(II) complexes with two pyrrole thiosemicarbazone ligands: Crystal structures and DNA interaction. Chin. J. Inorg. Chem. doi:10.11862/CJIC.2017.151.10.11862/CJIC.2017.151Search in Google Scholar

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Received: 2017-7-2
Accepted: 2017-10-8
Published Online: 2017-10-27
Published in Print: 2018-1-26

©2018 Hao Wu 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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