Well-Established Allotropes of Sulfur

Well-Established Allotropes of Sulfur A. Molecules with Less Than 6 Atoms 

Thiozone (83) has a ground state of like ozone. It is found together 

Species 84 occurs in a mixture with S3 in the gas phase, as indicated above. It can be synthesized in matrices by photolysis of S4CI2 or S2CI2 (67), or simply by recombination diffusion of 82 (66). This molecule has been identified by its UV and IR spectra. A variety of structures are feasible (Fig. 3a). The planar ring is also the structure proposed for 84 (41) which is considered to be aromatic in character. Calculations indicate that the branched structure, analogous to the SO3 structure, should be most stable (65). The most likely structure for this very unstable molecule is the trans chain. 8pecies 84, as well as 83 and 82, have been identified by mass spectroscopy (7). 

The S5 also occurs in sulfur vapor (7, 24). It is not clear whether the vapor contains cyclopentasulfur or catenapentasulfur, or both. Schmidt 87) proposes that 85 can be prepared from bis-ir-cyclopentadienyl-molybdenum tetrasulfide by reaction with monosulfurdichloride  

Engel 28) prepared cyclohexasulfur in 1891, and Aten (2) identified, in 1914, the rhombohedral crystals, but ingrained notions that Sg should 

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