Add time:09/29/2019         Source:infona.pl

A synthesis of high-purity SILICON DISULFIDE (cas 13759-10-9) SiS 2 is described, and the F.t.-Raman spectrum of the solid is reported for the first time. The standard massic energy of reaction of SiS 2 (cr) with fluorine was measured in a bomb calorimeter. The combustion reaction was shown to proceed as follows: SiS 2 (cr)+8F 2 (g)=SiF 4 (g)+2SF 6 (g). The derived standard molar enthalpy of formation is: Δ f H m o (SiS 2 , cr, 298.15 K)=−(254.6±2.9) kJ·mol −1 . This value differs significantly from those determined by solution-reaction calorimetry, but is in fair agreement with results obtained by means of third-law treatments of high-temperature equilibria. The ratio of molar enthalpies of dissociation of the “first” and “second” bonds in SiS 2 (g), κ=D m o (S–SiS)/D m o (SiS)=(0.57±0.03), is similar to κs reported previously for SiO 2 and SiSe 2 .

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