Home Physical Sciences The crystal structure of trichlorobis(pyridine-2,6-dithio-κS-carbomethylamido)antimony(III), [SbCl3(C9H11N3S2)2]
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The crystal structure of trichlorobis(pyridine-2,6-dithio-κS-carbomethylamido)antimony(III), [SbCl3(C9H11N3S2)2]

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Published/Copyright: August 9, 2024

Abstract

[SbCl3(C9H11N3S2)2], monoclinic, P21/n (no. 14), a = 13.8069(4) Å, b = 13.5739(6) Å, c = 14.0182(5) Å, β = 94.231(3)°, V = 2,620.04(17) Å3, Z = 4, R gt (F) = 0.0329, wRref(F2) = 0.0726, T = 153 K.

CCDC no.: 2374488

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: Yellow prism
Size: 0.32 × 0.28 × 0.20 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 1.70 mm−1
Diffractometer, scan mode: STOE IPDS 2, rotation method
θmax, completeness: 27.5°, >99 %
N(hkl)measured, N(hkl)unique, Rint: 34,269, 5,965, 0.039
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 5,231
N(param)refined: 309
Programs: X-RED, 1 X-AREA, 1 SHELX, 2 , 3 ORTEP-3 4
Table 2:

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

Atom x y z Uiso*/Ueq
Sb1 0.64366 (2) 0.24601 (2) 0.53951 (2) 0.01768 (6)
Cl1 0.78386 (6) 0.14400 (6) 0.57836 (6) 0.02799 (17)
Cl2 0.67120 (6) 0.33885 (6) 0.68384 (5) 0.02716 (16)
Cl3 0.53975 (6) 0.13044 (6) 0.61169 (6) 0.03006 (18)
S1A 0.08071 (5) 0.39812 (6) 0.86473 (5) 0.02098 (15)
S2A 0.45442 (6) 0.36408 (9) 0.47917 (7) 0.0397 (2)
N1A 0.23472 (17) 0.34382 (17) 0.64476 (17) 0.0166 (5)
N2A 0.05054 (18) 0.3262 (2) 0.69011 (19) 0.0208 (5)
H1N 0.069 (3) 0.310 (3) 0.638 (3) 0.024 (10)*
N3A 0.2649 (2) 0.3541 (2) 0.46135 (19) 0.0243 (6)
H2N 0.211 (3) 0.348 (3) 0.488 (3) 0.051 (13)*
C1A 0.2180 (2) 0.34679 (19) 0.7378 (2) 0.0148 (5)
C2A 0.2914 (2) 0.3423 (2) 0.8109 (2) 0.0197 (6)
H2A 0.276750 0.345868 0.875933 0.024*
C3A 0.3865 (2) 0.3326 (2) 0.7867 (2) 0.0240 (6)
H3A 0.438097 0.326279 0.834938 0.029*
C4A 0.4047 (2) 0.3324 (2) 0.6912 (2) 0.0235 (6)
H4A 0.469456 0.327467 0.672841 0.028*
C5A 0.3277 (2) 0.3395 (2) 0.6223 (2) 0.0186 (6)
C6A 0.1134 (2) 0.3545 (2) 0.7597 (2) 0.0158 (5)
C7A −0.0541 (2) 0.3225 (3) 0.6984 (3) 0.0315 (8)
H7A −0.068097 0.279183 0.751592 0.047*
H7B −0.086215 0.296775 0.638804 0.047*
H7C −0.078327 0.388874 0.710227 0.047*
C8A 0.3439 (2) 0.3505 (2) 0.5183 (2) 0.0204 (6)
C9A 0.2612 (3) 0.3709 (3) 0.3583 (2) 0.0327 (8)
H9A 0.273164 0.440766 0.345879 0.049*
H9B 0.197014 0.352417 0.329416 0.049*
H9C 0.311049 0.330898 0.330463 0.049*
S1B 0.59722 (6) 0.32279 (8) −0.03756 (7) 0.0350 (2)
S2B 0.80156 (6) 0.40692 (6) 0.48082 (5) 0.02731 (17)
N1B 0.73429 (17) 0.40148 (17) 0.20157 (17) 0.0166 (5)
N2B 0.76630 (19) 0.4087 (2) 0.01454 (18) 0.0218 (5)
H3N 0.800 (3) 0.440 (3) 0.059 (3) 0.023 (9)*
N3B 0.88898 (19) 0.4177 (2) 0.31998 (19) 0.0219 (5)
H4N 0.888 (3) 0.421 (3) 0.262 (3) 0.035 (11)*
C1B 0.6576 (2) 0.4000 (2) 0.1375 (2) 0.0180 (6)
C2B 0.5622 (2) 0.4135 (2) 0.1621 (2) 0.0245 (6)
H2B 0.509376 0.413291 0.114652 0.029*
C3B 0.5472 (2) 0.4273 (3) 0.2575 (2) 0.0272 (7)
H3B 0.483334 0.437372 0.276534 0.033*
C4B 0.6256 (2) 0.4264 (2) 0.3255 (2) 0.0222 (6)
H4B 0.616374 0.434493 0.391498 0.027*
C5B 0.7176 (2) 0.4134 (2) 0.2941 (2) 0.0175 (5)
C6B 0.6791 (2) 0.3809 (2) 0.0363 (2) 0.0196 (6)
C7B 0.8055 (3) 0.3971 (3) −0.0785 (2) 0.0284 (7)
H7D 0.856477 0.346790 −0.074292 0.043*
H7E 0.832859 0.459950 −0.098104 0.043*
H7F 0.753427 0.376911 −0.125787 0.043*
C8B 0.8070 (2) 0.4124 (2) 0.3621 (2) 0.0184 (6)
C9B 0.9852 (2) 0.4178 (3) 0.3698 (3) 0.0340 (8)
H9D 0.994569 0.478947 0.406517 0.051*
H9E 1.034461 0.413155 0.323167 0.051*
H9F 0.991378 0.361325 0.413434 0.051*

1 Source of materials

The synthesis of the title compound was performed using standard Schlenk technique 5 with Argon (5.9 Nippon gases) as inert gas. Pyridine-2,6-dithiocarbomethylamide was prepared according to a literature procedure. 6

In a representative experiment 495 mg (2.2 mmol) of pyridine-2,6-dithiocarbomethylamide was dissolved in 10 mL THF (purified in Mbraun SPS 800, VWR AnalaR). The solution was cooled in an ice-ethanol bath to −10 °C. 2 mL of n-butyllithium (2.5 M in hexanes, Merck) were added slowly. The solution turns red and was allowed to reach room temperature over 20 min. Afterward the solution was cooled down to −10 °C again and 0.5 g of SbCl3 (Merck, distilled before use, 2.2 mmol) dissolved in THF (40 mass%) and 10 mL of pure THF were added. The solution turned yellowish-green immediately. The solution was stirred at room temperature overnight. The solvent was removed under reduced pressure and was replaced with 10 mL of chloroform (Fisher scientific, stabilized with amylene, dried over molecular sieves 3 Å and activated alumina). The suspension was filtrated, the residue was washed with additional 5 mL of CHCl3. The solvent was removed under reduced pressure from the filtrate. 1 mL of CDCl3 was added for NMR. NMR analysis of the bulk product showed the formation of a product mixture. From the residue suspension orange crystals of the title compound suitable for X-ray diffraction were obtained after 6 weeks standing at room temperature. Large yellow prisms, decomposition point: 157 °C.

2 Experimental details

The carbon-bound H atoms were geometrically placed (C–H = 0.95–0.98 Å) and refined as riding atoms with Uiso(H) = 1.2–1.5 Ueq(C). The N-bound H-atoms were located in a difference Fourier map and their positions and isotropic displacement parameters were refined using isotropic approximation.

3 Comment

Pyridine-2,6-dithiocarbomethylamide has been used as chelate ligand to prepare several nickel, iron, and copper complexes. 6 , 7 , 8 , 9 Herein we describe the crystal structure of an adduct formed out of pyridine-2,6-dithiocarbomethylamide and antimony trichloride. The crystal structure was obtained as a side product during our work about chelate complexes of antimony. 10 , 11

The asymmetric unit of the crystal structure contains one molecule antimony trichloride, SbCl3, and two molecules of pyridine-2,6-dithiocarbomethylamide. The formation of a chelate complex, as initially intended, was not observed. Instead an adduct or simple coordination compound was formed, wherein three pyridine-2,6-dithiocarbomethylamide molecules coordinate via one sulfur atom each at the antimony atom. The bond lengths Sb1–Cl1 [2.4095(8) Å], Sb1–Cl2 [2.3901(8) Å], and Sb1–Cl3 [2.3995(8) Å] correspond well with the sum of covalent radii of 2.40 Å [r(Sb) = 1.41 Å, r(Cl) = 0.99 Å]. 12 The atomic distances Sb1⋯S2A [3.128(1) Å], Sb1⋯S2B [3.2349(8) Å] and Sb1⋯S1A [3.2050(8) Å] are substantial longer than the sum of covalent radii of 2.45 Å [r(S) = 1.04 Å], but shorter than the sum of van der Waals radii of 3.86 Å [r(Sb) = 2.06 Å, r(S) = 1.80 Å]. 13 The last interaction between Sb1 and S1A is not shown in the figure, since the sulfur atom belongs to a symmetry equivalent molecule of pyridine-2,6-dithiocarbomethylamide on the position x + 1/2, −y + 1/2, z − 1/2. The interactions with three chlorine and three sulfur atoms making the antimony atom hexacoordinated. The coordination geometry at the antimony atom can be classified as distorted octahedral. The trans bond angles vary between 169.68(3)° for Cl3–Sb1–S2B and 175.32(3)° for Cl1–Sb1–S2A. The cis bond angles in the distorted octahedron vary from 77.67(2)° for Cl3–Sb1–S1A to 111.57(2)° for S2B–Sb1–S1A.

The thiocarbomethylamide units of the ligand molecules have conformational flexibility to rotate around the bonds C1–C6 and C5–C8 (in both molecules A and B). Both groups adopt a conformation in the solid state where the sulfur atoms are oriented away from the pyridine nitrogen atom. The same conformation of thiocarbomethylamide units was observed in the crystal structure of pyridine-2,6-dithiocarbomethylamide. 14 This conformation allows the formation of hydrogen bonds between the N–H groups at N2 and N3 with the pyridine nitrogen atom N1 (in molecules A and B). On the other side, the sulfur atoms are oriented in lateral positions at the pyridine-2,6-dithiocarbomethylamide and allow coordination with the antimony atom in the present structure. Further hydrogen bonds are formed between N–H respectively C–H groups and sulfur atoms, forming a complicated threedimensional network in the solid state.

There are a few related crystal structures containing pyridine-2,6-dithiocarbomethylamide as ligand in nickel and copper complexes. 7 , 8 , 9 However, a comparison of these structures with the title compound is not fruitful, since the ligand molecule acts in these complexes as chelate ligand.


Corresponding author: Uwe Böhme, Institut für Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Str. 29, 09599 Freiberg, Germany, E-mail:

Acknowledgments

The authors thank TU Bergakademie Freiberg (Freiberg, Germany) for financial support. Open Access Funding by the Publication Fund of the TU Bergakademie Freiberg.

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

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

  3. Research funding: TU Bergakademie Freiberg (Freiberg, Germany).

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Received: 2024-06-24
Accepted: 2024-07-30
Published Online: 2024-08-09
Published in Print: 2024-10-28

© 2024 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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