Thiazyl chloride trimer
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| Names | |
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| Other names
thionitrosyl chloride | |
| Identifiers | |
| 3D model (JSmol) |
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| Properties | |
| Cl3N3S3 | |
| Molar mass | 244.55 g·mol−1 |
| Appearance | white solid |
| Melting point | 168 ºC |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Thiazyl chloride trimer is the inorganic compound with the formula S3N3Cl3. It is a white solid. It is a reagent in main group chemistry,[1] but has no commercial applications.
Structure
The molecule has C3v symmetry. The S3N3 core is slightly ruffled structure with S-N distances of 160.5 pm. The three chloride groups are attached to sulfur with S-Cl distance of 208 pm, and are mutually cis, as the S centers are pyramidal. In contrast to the NSCl connectivity, nitrosyl chloride has the connectivity ONCl.[2][3]
Synthesis and reactions
It is obtained by chlorination of tetrasulfur tetranitride:
- 3/4 S4N4 + 1.5 Cl2 → S3N3Cl3
At 100 ºC in vacuum, thiazyl chloride trimer undergoes cracking to thiazyl chloride monomer, which is a green gas.
- S3N3Cl3 → 3 NS-Cl
In NSCl, chloride is bonded to the chalcogen, in contrast to nitrosyl chloride with an N-Cl bond. In contrast, with six fewer electrons, cyanuric chloride is a planar ring.
It reacts with nitriles to dithiadiazolium chlorides:[2]
- RCN + 2/3 S3N3Cl3 → [RCN2S2]Cl + 1/2 Cl2 + 1/2 N2
The compound oxidizes to the S(VI) compound S3N3O3Cl3, which exists as isomers.
References
- ↑ William L. Jolly, Keith D. Maguire (1967). "Sulfur Nitrogen Chlorides". Inorg. Synth. IX. doi:10.1002/9780470132401.ch27.
- 1 2 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
- ↑ Wiegers, G. A.; Vos, A. (1966). "The Crystal Structures of Two Sulfur-Nitrogen Compounds with (S-N)3 Rings. II. Trithiazylchloride, (NSCl)3, at -130 C". Acta Crystallographica. 20: 192.