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..:· -14- B. Allotropes The smaller and more important molecular species have been mentioned · in the section on sulphur vapour. There we refer only to those which can be either prepared or stored at room temperature. Sulphur atoms recombine at room temperature immediately. They can,__. however, be produced in solution through photolysis, or through nuclear reactions. s2 has been trapped at low temperature, and s3, thiozone, undoubtedly can also be stored in inert solutions. s4 and s5 are so little known that their stability is difficult to judge. s and s are not yet 79 described, but both probably are quite stable and might ultimately be isolated in pure form. Cyclohexa Sulphur. Cyclohexa sulphur can be prepared after the methods of Aten or Engel (42) which have been widely used but not significantly improved. Concentrated hydrochloric acid is slowly sti~red into a concen• . ,...._, trated thiosulfate solution at 0° to l0°C. Cyclohexa sulphur and cyloocta -sulphur are then extracted from the mothe~ liquid with toluene or benzene. On evaporation or cooling of the extract cyclohexa sulphur crystallizes in dark yellow-red rhombohedral crystals with a yield of about 12%. The ·mechanism of the cyclohexa sulphur formation has been carefully studied.(43). · () . . ~- The intermediate products are polythionate chains which undergo ring closure, and not, as commonly described in. textbooks, free atoms or small. ,. molecules of elemental sulphur. Cyclo S6 can also be prepared ~y the · specific reaction (27). Cyclohexa sulphur is thermodynamically unstable, but as pure crystal or in pure solution it can be stored for extended periods of time, even at ..... ;... '' ·_,PDF Image | ELEMENTAL SULPHUR
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