Studies on trifluoromethanesulfonic acid. Part 2. Conductivities of solutions of metal trifluoromethanesulfonates and other bases in trifluoromethanesulfonic acid

Abstract

. Can. J . Chem. 58,22(1980) Electrical conductivity measurements are reported for solutions in trifluoromethanesulfonic acid of a number of simple and complex bases. including univalent and divalent metal trifluoromethanesulfonates. The univalent metal salts, water. aniline, and acetic acid behave a s fully dissociated bases, while the alkaline earth metal salts show considerable ion association. The trifluoromethanesulfonate anion appears to have an abnormally high mobility, as compared to the metal cations. and is believed to conduct by a proton-transfer mechanism. Dissociation constants for some n e a k organic bases and association constants for strontium and barium trifluoromethanesulfonates are estimated. Sulfuric acid behaves as a weak electrolyte, while sulfur trioxide is effectively a non-electrolyte. The conductivities of potassium nitrate and potassium dihydrogenphosphate are consistent nith the formation of the nitryl cation and the phosphate acidium ion. respectively. DAVID G. R U S S E L L~~ JOHN B. SENIOR. Can. J . Chem. 58,22(1980). On rapporte les mesures de conductivite electrique d'un certain nombre de bases simples et complexes incluant les trifluoromethane sulfonates de metaux mono et bivalents en solution dans I'acide trifluoromethane sulfonique. I.es sels de metaux monovalents. l'eau, I'aniline et l'acide acetique se comportent comme des bases totalement dissociees alors que les sels de metaux alcalino terreux montrent une tres grande association d'ions. L'anion trifl~~oromethanesulfonique semble avoir une grande mobilite qui est anormale si on la compare B celle des cations metalliques et on pense que cette mobilite est due a un mecanisme de transfert de proton. On evalue les constantes de dissociation de quelques bases organiques faibles et les constantes d'association des trifluoromethanesulfonates de strontium et de barium. L'acide sulfurique se comporte comme un electrolyte faible alors que l'anhydride sulfurique est effectivement un non electrolyte. Les conductivites du nitrate et du phosphate diacide de potassium sont en accord avec la formation du cation nitryle et de I'ion phosphate acidium respectivement.[Traduit par le journal]

Molecular dynamics simulations of triflic acid and triflate ion/water mixtures: A proton conducting electrolytic component in fuel cells

“…The box sizes and densities obtained from equilibration are shown in Table 3. The computed triflic acid density is 1.692 g cm À3 at 300 K and is in excellent agreement with the experimental [46] density of 1.698 g cm À3 at 298.15 K.…”

Kristallstruktur, Phasenumwandlung und Kaliumionenleitfähigkeit von Kaliumtrifluormethylsulfonat

“…In spa È teren Arbeiten [6] Z. Anorg [6], Aktivita Ètskoeffizienten [7]) ermittelt. Kaliumtriflat findet wie andere Triflate als Bestandteil polymerer fester Elektrolyte sowie in der organischen Synthese Verwendung [8,9].…”

Azole substituted polyphosphazenes as nonhumidified proton conducting membranes

“…Triflic acid is a strong acid with a conductivity of $10 À5 S cm À1 at room temperature. 36 Proton transfer of triflic acid to different azole derivatives was previously reported 37 and the study indicated the effect of pK a of the azole molecules on proton conductivity of azole-TA systems. However later studies showed that proton conductivity of the azole immobilized systems depends mostly on the acid ratio and the mobility of the polymer chains rather than the pK a values.…”