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Chemical compound
Trithiazyl trichloride is the inorganic compound with the formula . A white solid, it is a precursor to other sulfur nitrides, but has no commercial applications.
Structure.
The molecule is a 6-membered ring of alternating nitrogen and sulfur atoms, where each sulfur atom is attached to one chlorine atom by a single bond. The molecule contains alternating single and double bonds in the core. The molecule has C3v symmetry. The core is slightly ruffled structure with S-N distances of 160.5 pm. The S-Cl distances are 208 pm, and the chlorine atoms are mutually "cis". The S centers are tetravalent and pyramidal. In contrast to the NSCl connectivity, nitrosyl chloride has the connectivity ONCl.
Synthesis and reactions.
Trithiazyl trichloride is obtained by chlorination of tetrasulfur tetranitride or thiazyl fluoride monomer:
At 100 °C in vacuum, thiazyl chloride trimer undergoes cracking to thiazyl chloride monomer, which is a green gas.
In N≡S−Cl, chlorine is bonded to sulfur, in contrast to nitrosyl chloride O=N–Cl, where chlorine is bonded to nitrogen. In contrast, with six fewer electrons, cyanuric chloride is a planar ring.
Alkoxide or silver salts displace the chlorides:
(-NS(Cl)-)3 + 3 NaOR → (-NS(OR)-)3 + 3 NaCl
(-NS(Cl)-)3 + 3 AgX → (-NS(X)-)3 + 3 AgCl
Treating thiazyl chloride with sulfur in the presence of antimony pentachloride gives dithionitronium hexachloroantimonate:
It reacts with nitriles to dithiadiazolium chlorides:
Sulfur trioxide successively oxidizes the compound at the sulfur atoms to , which exists as stereoisomers.