Ion-molecular interactions in solutions of methanesulfonic acid in diethylamine according to IR spectroscopy data

Infrared Studies of the Reaction of Methanesulfonic Acid with Trimethylamine on Surfaces

“…It is clear that the peaks due to the salt are essentially the same as those in the DRIFTS spectra of the silicon surface exposed to gaseous MSA and then to gaseous TMA (see Figure c), establishing that the MSA–amine reaction on the surface forms the trimethylaminium methanesulfonate salt. In the transmission spectrum of the salt, there are also a number of strong peaks in the 900–1300 cm –1 region which are similar to those reported in a liquid mixture of MSA with diethylamine but which are not accessible in the DRIFTS studies because of the strong absorptions by the silicon substrate and halocarbon wax on the ZnSe windows. The presence of the peak at 1362 cm –1 in the MSA spectrum (Figure a) but not in the salt spectrum (Figure ) supports the previous assignment of the 1362 cm –1 peak to undissociated molecular MSA and the 1342 cm –1 peak to the CH 3 SO 3 – anion.…”

“…Thus, the changes shown are due to the uptake and/or reaction of MSA or TMA, with positive peaks representing new or increased absorptions and negative peaks representing losses compared to the silicon powder alone. In the case of exposure to MSA (Figure a), the most prominent change is a new peak at 1362 cm –1 attributable to the asymmetric stretch of S(O)(O). − A small peak at 3036 cm –1 results from the stretch of OH of MSA, ν(OH). , The negative peak at 3743 cm –1 is due to a decrease in the free O–H on the surface, − which can occur due either to hydrogen bonding with a species such as MSA, or to reaction. When the silicon surface was purged with dry air after the MSA exposure, the peak at 1362 cm –1 decreases, while the negative peak at 3743 cm –1 remains.…”

“…The time dependence of the growth of each of these new peaks (under dry conditions) is similar, suggesting that either they are attributable to the same species or they are different species but formed simultaneously. Using literature data for mixtures of MSA and diethylamine in the liquid-phase, of alkanesulfonic acids, esters and salts, and of methyl methanesulfonate in the liquid and solid states, these peaks were tentatively assigned as follows: 775 cm –1 , ν(C–S) or ν(S–O); 1036 cm –1 , ν s ((S(O)(O)); 2750 and 3043 cm –1 , ν(CH).…”

Influence of TiO2 as Filler on the Discharge Characteristics of a Proton Battery

“…Methanesulfonic acid can be dissolved in polymer blend matrix of PMMA/PVP by virtue of coordinative interaction between MSA and polar groups present in the polymers [17]. The appearance of characteristic peaks at 763 cm -1 , 981 cm -1 and 1137cm -1 corresponds to MSA, ν s (C-S), ρ s+as (CH 3 ) and ν as (SO 3 -) respectively [18]. The symmetric stretching of C-S bond in MSA is shifted from 763 to 776cm -1 in polymer blend electrolyte and it is disappeared in nano composite as shown in Figure 1(I).…”