Hexafluoroarsenate complexes

The hexafluoroantimonate and hexafluoroarsenate complexes were found to be particularly stable.91 645,646 Deno et al.648 investigated solutions of carboxylic acids in sulfuric acid and oleum. They observed protonation at lower acid concentrations and dehydration, giving acyl cations, at higher acidities [Eq. (3.95)]. 

Although 1,3,5-triselenane (120 R = H) is unstable, the heterocycle and its oligomers form relatively stable complexes with silver salts. With silver hexafluoroarsenate in sulfur dioxide, for example, 1,3,5-triselenane affords a complex [[(CH2Se)3]2Ag]AsF6 in which the silver atom is equidistant from all the selenium atoms in both heterocyclic subunits <83JOM(249)97>. 

Dicarbadodecaborane(12), l,2-(l,2-ethanediyl)-, 29 101 B10O3SC11H22,2-( 1,2-Dicarbadodecaborane-(12)-l-yl)ethanol, 4-methylbenzenesul-fonate ester, 29 102 BaCl2, Barium dichloride, 29 110 BrAsFgS, cyc/o-Heptasulfur(l + ), bromo-, hexafluoroarsenate(l—), 27 336 BrCH], Methane, bromo-, osmium and ruthenium complexes, 27 201, 205 BrC gHj9, Benzene, l-bromo-2,4,6-tri-ferf-butyl-, 27 236... 

Although charge transfer complexes with Sg, metal complexes with ionic sulfur moieties/ and several covalent compounds containing homocyclic sulfur rings are well established, the reaction of cyc/o-octasulfur with silver hexafluoroarsenate in liquid sulfur dioxide provides a new synthetic pathway to a coordination compound of a neutral Sg ring/ Earlier work has shown that metal hexafluo-roarsenates form complexes with very weak O, N, and S donors, using liquid sulfur dioxide as solvent/... 

Silver hexafluoroarsenate is a white crystalline solid, sensitive to moisture and light. Therefore, it should be stored in a dark sealed tube. It is very soluble in SO2, insoluble in nonpolar solvents such as dichloromethane, and soluble in complexing solvents such as acetonitrile and dioxane with complex formation. Contact with such solvents should be avoided, since the solvent complexes are very stable and the salt is no longer useful for complexation. 

Bis(cydo-octasulfur)silver( 1 +) hexafluoroarsenate(l —) is a moisture-sensitive pale yellow crystalline solid that decomposes in the daylight to yield black AgjS. It can be stored indefinitely in a dark sealed tube under nitrogen. The compound is soluble only in SO2, insoluble in nondonor solvents, and decomposes in donor solvents, yielding the solvent complex and elemental sulfur. 

Conductive salts for the electrolyte mixture are to be chosen with preferably low lattice energy. So solvation is easy and a high percentage of the solute might be dissociated in the solution. For most systems salts of lithium are chosen which are combined with big complex anions such as, e.g. lithium perchlorate LiC104, lithium tetrafluoroborate LiBF4, lithium hexafluoroarsenate LiAsFg, lithium hexafluoropho-... 

---