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Se 5 S in CS 2  solution at 20°C spontaneously decomposes to give a mixture of 8 selenium-rich cyclic molecules which have been identified by reversed-phase HPLC and  77 Se NMR spectroscopy as Se 6 , Se 7 , Se 8 , Se 6 S, Se 7 S, 1,2-Se 6 S 2 , 1,5-Se 6 S 2 , and 1,4-Se 4 S 2 . NMR spectra of Se 5 S, Se 7 S, and 1,5-Se 6 S 2  have been measured for the first time; Raman spectra of solid Se 5 S and Se 7 S as well as crystal data of Se 7 S are reported in addition. A mechanism based on nucleophilic attack on Se 5 S is proposed for the formation of the products.

Spectroscopic Characterization of the Selenium-Rich Heterocycles Se 5 S, Se 7 S, and 1,5-Se 6 S 2