Disulfide ion

The addition of disulfide ions to a polarized 1,3-diyne system occurs in the same manner (77HOU947). 

Disulfides can be prepared by treatment of alkyl halides with disulfide ions and also indirectly by the reaction of Bunte salts (see 10-41) with acid solutions of iodide, thiocyanate ion, or thiourea, or by pyrolysis or treatment with hydrogen peroxide. Alkyl halides also give disulfides when refluxed with sulfur and NaOH, and with piperidinium tetrathiotungstate or piperidinium tetrathiomolybdate. ... 

However, since the authors assumed that no hexasulfide and negligible amounts of tri- and disulfide ions were present in their solutions at pH values of 11-12, these data can be only approximately correct. In any case, it is obvious that the acidity of aqueous sulfanes increases with increasing sulfur content, as it does in the gas phase. 

H2S (hydrogen sulfide, colorless), HS (hydrogen sulfide ion, colorless), (sulfide ion, colorless), 82 (disulfide ion, orange), 83 (trisulfide ion, orange). 

Pyrite (FeS2) is often called fool s gold because of its golden yellow color. It contains the disulfide ion (S22-), the sulfur analogue of the peroxide ion (022-). 

The disulfide ion (S2 ) can, like O2-, coordinate either side-on or as a bridge ... 

In case that disulfide ion, is present in the solution, the thio-... 

Mercuric sulfide is soluble in a solution of sodium sulfide and sodium hydroxide (to repress hydrolysis of the sulfide, vhich vould decrease the sulfide ion concentration), but not in a solution of ammoniunt sulfide and ammonium hydroxide, in which the sulfide-ion concentration is smaller. The other suWdes listed are soluble in both solutions. CuS, AgoS, BioSg, CdS, PbS, ZnS, CoS, NiS, FeS, MnS, and SnS are not soluble in sulfide solutions, but most of these form complex sulfides by fusion with NhoS or KoS. Although SnS is not soluble in Na S or (NH4)oS solutions, it dissolves in solutions containing both sulfide and disulfide, Na- S. or (NH4)2S2, or sulfide and peroxide. The disulfide ion. So—, or peroxide oxidizes the tin to the stannic level, and the sulfostannate ion is then formed ... 

Tetradialkyl disulfide ions (R2SS-SSR2 ) R=Me, R = Me 27.5 at 0 K 115 Equilibrium 1996JAM/ILL... 

Suppose that we take ferrous oxide (FeO), which has the NaCl structure, and replace the oxide ion with the disulfide ion (82 ). The stracture in Figure 60 shows each 82 ion aligned along the c-axis. Make sure that you can see that this is indeed the NaCl structure with the 82 ions replacing the chloride ions and Fe replacing the sodium ions. 

No, the alignment of the disulfide ions along the c-axis extends or elongates the unit cell in the c-direction and makes it tetragonal rather than isometric. 

There are three sets of four disulfide ions. In the middle layer we see one set, each member of which has the same orientation. Although it is not obvious, this arrangement of disulfide ions retains the isometric symmetry of the NaCl structure. A sample of pyrite is shown in Figure 62. 

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