Molekulare Zusammensetzung von flüssigem Schwefel. Teil 2: Qualitative Analyse und Isolierung von S7, S12, α-S18 und S20 |
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Authors: | Ralf Steudel Hans-Joachim Musle |
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Institution: | Ralf Steudel,Hans-Joachim Mäusle |
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Abstract: | Molecular Composition of Liquid Sulfur. Part 2: Qualitative Analysis and Preparation of S7, S12, α-S18, and S20 from S8 Raman spectra of sulfur melts (115–300°C), of quenched melts and of CS2 extracts of quenched melts show besides S8 the presence of S6 and S7. Formation of S7 from S8 at 120°C takes more than 8 h; the S7 equilibrium concentration increases with temperature. Pure crystalline S7, S12, α-S18 and S20 are prepared on a preparative scale by fractional extraction, crystallization, flotation and precipitation of quenched sulfur melts. Also a mixture of larger rings (Sx; x? = 25) has been isolated. Infrared and Raman spectra of α-S18, S20 and Sx are reported. |
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