PDF Publication Title:
Text from PDF Page: 160
150 Ingo Krossing Fig. 12 Charge delocalization in S82+ teractions leads to the observed slightly shortened S-S bond lengths and the small long-short-short-long bond lengths alternation starting from the api- cal sulfur atom [23]. 7.4 Bonding in S192+ Little is known about the S192+ dication and no quantum chemical calcula- tion of this species has been reported to date. However, by analogy to the bonding modes established for S82+ it was suggested that the marked bond length alternation within the two seven membered rings, which decreases with increasing distance from the tricoordinate sulfur atoms, is due to mul- tiple 3p2!3s* interactions. The tricoordinate sulfur atoms in S192+ are, pre- sumably, the only atoms that only possess a 3s2 lone pair, but no 3p2 lone pair orbital. The unfavorable localized positive charge formally residing on the two tricoordinate chalcogen atoms is then delocalized by several 3p2!3s* interactions, which transfer electron density from the vicinal 3p2 lone pair orbitals into the empty, antibonding 3s* orbital of the bonds adja- cent to the tricoordinate atoms. Therefore the bonds around the tricoordi- nate chalcogen atoms are relatively long. Strong interactions around the tri- coordinate sulfur atoms, in turn, induce a positive charge to reside on the vicinal sulfur atoms which is then subsequently delocalized by the formation of further 3p2!3s* interactions. This and the bond lengths alternation in- herent in an S7 ring [30, 31] lead to the bond lengths alternation observed throughout the seven membered rings. 8 Summary, Conclusion, and Outlook Homoatomic sulfur cation are a fascinating class of compounds that maxi- mize non-classical bonding in their solid state structures. Synthesis as well as quantum chemical calculations of these species are difficult but yet possi- ble tasks and their structures and bonding interactions are now well under- stood. Structure and bonding of the in the solid state characterized sulfurPDF Image | Topics in Current Chemistry
PDF Search Title:
Topics in Current ChemistryOriginal File Name Searched:
Elemental-Sulfur-und-Sulfur-Rich-Compounds-I.pdfDIY PDF Search: Google It | Yahoo | Bing
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
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |