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| CAS No.: | 28950-34-7 |
|---|---|
| Name: | 1$l^{4},3,5$l^{4},7-tetrathia-2,4,6,8-tetrazacycloocta-1,4,5,8-tetraene |
| Article Data: | 43 |
| Molecular Structure: | |
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| Formula: | N4S4 |
| Molecular Weight: | 184.291 |
| Synonyms: | 1,3,5,7,2,4,6,8-Tetrathia(3,7-SIV)tetrazocine(9CI); Sulfur nitride (S4N4) (6CI,8CI); Nitrogen sulfide (N4S4); Tetranitrogentetrasulfide; Tetrasulfur tetranitride |
| Density: | 2.28g/cm3 |
| Melting Point: | 178°; mp 180° |
| Boiling Point: | °Cat760mmHg |
| Flash Point: | °C |
| Safety: | An explosive sensitive to friction, shock, or heating above 100°C or contact with Ba(ClO3)2. Sensitivity increases with purity. Endothermic nitride can explosively decompose on friction, shock, or heating. When heated to decomposition it emits very toxic fumes of SOx and NOx. |
| PSA: | 164.22000 |
| LogP: | 1.06960 |
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Chemistry
S4N4 is stable to air. It is, however, unstable in the thermodynamic sense with a positive enthalpy of formation of +460 kJ mol−1. This endothermic enthalpy of formation anticipates its inherent instability, and originates in the difference in energy of S4N4 compared to its highly stable decomposition products:
Because one of its decomposition products is a gas, S4N4 is an explosive. Purer samples tend to be more explosive. Small samples can be detonated by striking with a hammer.
S4N4 is thermochromic, changing from pale yellow below −30 °C to orange at room temperature to deep red above 100 °C.
IUPAC Name: 2$l^{4},4,6$l^{4},8-Tetrathia-1,3,5,7-tetrazacycloocta-1,2,5,6-tetraene
The MF of Tetranitrogen tetrasulfide (CAS NO.28950-34-7) is N4S4.
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The MW of Tetranitrogen tetrasulfide (CAS NO.28950-34-7) is 184.29.
Synonyms of Tetranitrogen tetrasulfide (CAS NO.28950-34-7): Tetranitrogen tetrasulfide ; Tetrasulfur tetranitride
Solubility in other solvents: CS2, benzene
Solubility in water: Insoluble
Appearance Orange solid
Index of Refraction: 1.123
Density: 2.28 g/ml
Melting Point: 187 °C
Uses
Many important S-N compounds are prepared from S4N4.
Production
S4N4 was first prepared in 1835 by W. Gregory, by the reaction of sulfur monochloride with ammonia.Until recently, S4N4 was prepared by the reaction of ammonia with SCl2 in carbon tetrachloride followed by extraction into dioxane, producing sulfur and ammonium chloride as side-products:
4 NH4Cl + 6 S2Cl2 → S4N4 + 16 HCl + S8
Safety Profile
S4N4 is shock-sensitive, thus grinding solid samples should be avoided. Purer samples are reportedly more sensitive than those contaminated with elemental sulfur.
Specification
It is an inorganic compound with the formula S4N4. This gold-poppy coloured solid is the most important binary sulfur nitride, which are compounds that contain only the elements sulfur and nitrogen. It is a precursor to many S-N compounds and has attracted wide interest for its unusual structure and bonding.
Nitrogen and sulfur have similar electronegativities. When atoms are so evenly matched, they often form extensive families of covalently bonded structures. Indeed, a large number of S-N and S-NH compounds are known with S4N4 as their parent.
S4N4 adopts an unusual “extreme cradle” structure, with D2d point group symmetry. It can be viewed as a derivative of a hypothetical eight-membered ring of alternating sulfur and nitrogen atoms. The pairs of sulfur atoms across the ring are separated by 2.586 Å, resulting in a cage-like structure as determined by single crystal X-Ray diffraction. The nature of the "transannular" S–S interactions remains a matter of investigation because it is significantly shorter than the sum of the van der Waal's distances but has been explained in the context of molecular orbital theory. The bonding in S4N4 is considered to be delocalized, which is indicated by the fact that the bond distances between neighboring sulfur and nitrogen atoms are almost the same.