Sulfur tetrachloride

Using Lewis structures and VSEPR, give the VSEPR formula for each of the following species and predict its shape (a) sulfur tetrachloride (b) iodine trichloride (c) 1F4 ... 

Reactions with excess chlorine or fluorine yield sulfur tetrachloride, SCL, or hexafluoride, SFe. These reactions occur under cold conditions. 

Sulfur, unlike oxygen, has the capacity to expand its valence shell beyond the normal octet of electrons to form hypervalent compounds such as sulfur tetrafluoride (SF4) with 10 electrons in the outermost shell and sulfur hexafluoride (SF6) containing 12 electrons in the valence shell.63,7 The chemistry of hypervalent sulfur started in 1873 with the discovery of the unstable compound sulfur tetrachloride (SCI4). The existence of hypervalent sulfur compounds is an important feature of the chemistry of sulfur and the precise nature of the bonding in these molecules has remained a puzzling problem. 

Write the chemical formula for each of the following compounds (a) diboron trioxide, (b) dinitrogen pentasulfide, (c) phosphorus triiodide, (d) sulfur tetrachloride, (e) silicon sulfide, (f) hydrogen sulfide, (g) tetraphosphorus hexoxide. 

Sulfur tetrachloride and arsenic trifluoride combine readily to form SC14 2AsF3 (Ruff and Thiel, 1904, 251). The substance is a pale yellow solid which is very hygroscopic. It hydrolyzes rapidly in water or NaOH solution and attacks organic matter. Glass is attacked only slowly. 

Sulfur diimide should be obtained most simply by ammonolysis of a halide of tetravalent sulfur. Sulfur tetrachloride or trithiazylchloride (XLIV) are available as acid halides for such a reaction. The former is very readily decomposed by ammonia, but S(NH)2 cannot be identified among the reaction products which consist chiefly of S4N4, NH4C1, and chlorine (43). Only an organic derivative of (XLII) could be prepared in a solvolytic reaction of this sort with SC14, in which butylamine gave the n-butylimide (XLIII) (53). 

Synthesis and General Properties. Sulfur tetrachloride, a pale yellow crystalline solid, is prepared best by chlorination of sulfur dichloride at —78° (I). Selenium tetrachloride also pale yellow is available corn-... 

SCI4 Sulfur tetrachloride Sulfur(IV) chloride 11. CH3—C(=0)C1 Acetyl chloride ... 

Addition of sulfur tetrachloride to unsatd. carbon-carhon bonds... 

Addition of selenium and sulfur tetrachlorides to unsatd. carhon-carhon bonds... 

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