Topics in Current Chemistry

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40 Ralf Steudel · Bodo Eckert Fig. 15 Geometries of various isomers of the S8 molecule calculated at the B3LYP/ 6–31G(2df) level; bond lengths in pm [79] Table 17 Relative enthalpies of the S8 isomers shown in Fig. 15 (in kJ mol􏱐1) calculated at the 3X(MP2) level [79] Species Crown-S8 (1) Cluster-S8 (2) Exo-endo-S8 (3) Twisted ring-S8 (4) Boat-S8 (5) Chair-S8 (6) S7=Sax (7) S7=Seq (8) Triplet-chain-S8 (9) DH􏰹298 DG􏰹298 0.0 0.0 33.3 28.3 35.2 27.8 37.7 30.1 44.8 41.1 57.0 48.5 92.9 82.5 95.8 86.6 154.4 129.1 is the S7 ring which undergoes facile pseudorotation with an activation bar- rier of only 4 kJ mol􏱐1 (see above, allotropes of S7) [69]. 2.2.3 Allotropes Consisting of Long Chains One of the most interesting properties of sulfur atoms is the ability to form long polymeric chain molecules. At least three crystalline allotropes of mac-

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Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info

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