Oxygen-sulfur chelates

Other anionic species include the ions [Ge(S03F)6]2 and [Sn(S03F)5] formed by oxidation of the element with S206F2in HSO3F, the nitrate [Sn(N03)6]2", and SnCl5(THF)".64 There are also distorted tbp spirocyclic oxygen or sulfur chelated anions (e.g., 8-IV and 8-V) that are nonrigid in solution, oxalates [M(ox)3]2", and other carboxylates. 

I Redox Indicators 10.7.2 Ion Selective Electrodes iOJJ Gas Chromatography I0.7.3.J Volatile metal chelates 10.73.2 Ligands coniaining oxygen, sulfur or nitrogen 10.7.3.3 Stationary phases steric hindrance... 

Chelating compounds are the most important class of compounds that can be used and applied in the processes of solid-phase extraction (SPE) of transition and non-transition metal ions. The reason for this interest and conclusion is the presence of certain donor atoms, mainly nitrogen, oxygen, sulfur, and phosphoms in these compounds. The donor atoms are the active centers and are known to be responsible for the incorporation of certain selectivity characteristics into the newly modified solid phases. However, the reported mles controlling such incorporated selectivity toward certain metal ions are mainly based on several important factors ... 

Another interesting class of phosphine-free and highly stable catalysts developed by Lemcoff and coworkers has sulfur-chelation in place of oxygen (Figure 11.4) [44,45]. This catalyst was foimd to be inert at room temperature and could be activated thermally or photochemically for ROMP and RCM [46,47]. 

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