Water DMSO solutions

When the 4 1 water DMSO solution was used for the Ag deposition on wejo-PS, the porous layers peeled of after the immersion plating. No distinct maximum has been observed at these conditions for macro-PS. 

DMSO (dimethyl siilphoxide) solution and the anode solution is a water-DMSO solution saturated with potassium iodide. Ihe cathode is a platinum wire, while the anode is a silver rod. As the pK of the thymolphthalein indicator used to sense the pH in the titration cell is temperature-dependent, the titration cell should be kept at a constant temperature (within 0.2 °C) to achieve maximum precision. This can be done either by water-jacketing the titration cell, or by continuously blowing air of constant temperature around the cell. 

Lin, D.-J., C.-L. Chang, C.-K. Lee, and L.-P. Cheng. 2006b. Preparation and Characterization of Microporous PVDF/PMMA Composite Membranes by Phase Inversion in Water/ DMSO Solutions. European Polymer Journal 42(10) 2407-2418. doi 10.1016/j. eurpolymj.2006.05.008. 

Koulkes-Pujo and coworkers studied the radiolytic reduction of Ce in water-DMSO mixtures and found that while in water G(Ce ) is 2.5, the addition of DMSO increases the yield very much and leads to G(Ce )= 18.1 for 1.4 m DMSO. At higher concentrations of DMSO the yields decrease down to 14.4 for pure DMSO. The high value of G(Ce ) was explained on the basis that all species created by ionization of the medium, including H, OH, HjOj and HO2, are rendered reducing in the presence of DMSO. It is not necessary to increase the DMSO concentration beyond 0.5 m to increase significantly the reduction yield. In aqueous solution without DMSO the Ce reduction is accompanied by O2 formation with a yield near 0.8, however in the presence of DMSO, Oj is never formed. The increased yield of reduction and the absence of O2 formation might have implications in radiobiochemistry. ... 

Extreme care should be taken when handling DMSO solutions, as one of its other characteristics is its ability to absorb through the skin taking your sample with it This can obviously be a source of extreme hazard. Wash off any accidental spillages with plenty of water - immediately (This goes for all other solvents too). 

ABH is relatively insoluble when directly added to water or buffer, and therefore it should be pre-dissolved in DMSO prior to addition of an aliquot to an aqueous reaction medium. Stock solutions at a concentration of 50 mM ABH in DMSO work well. Since both reactive groups on ABH are stable in aqueous environments as long as the solution is protected from light, a secondary stock solution may be made from the initial organic preparation by adding an aliquot to the hydrazide reaction buffer (0.1 M sodium acetate, pH 5.5 O Shannessy et al., 1984 O Shannessy and Quarles, 1985). Make a 1 10 dilution of the ABH/DMSO solution in the reaction buffer. This solution may be stored in the dark at 4°C without decomposition. 

However, certain contradictions can be seen from the data of Tables 1 and 2. Indeed, the molecular weights determined for aqueous solutions of these p- and s-fraclions in the SEC experiments (Table 1) coincided well with the results of light scattering for DMSO solutions (Table 2) but why did the molecular weights differ so considerably from the light scattering data (Table 2) for the solutions of given copolymers in pure water, where, in... 

In the first step, phenolic monomers were reacted with potassium hydroxide in DMSO solution to form the potassium arylate salts, which were then dried in situ by azeotropic distillation of the water with toluene. After removal of a portion... 

Polymer Solubility. The modified polymers were soluble in DMSO, dimethylacetamide, dimethylformamide and formic acid. They were insoluble in water, methanol and xylene. Above about 57% degree of substitution, the polymers were also soluble in butyrolactone and acetic acid. Solubility parameters were determined for each polymer by the titration procedure as described in the literature (65). The polymer was dissolved in DMSO and titrated with xylene for the low end of the solubility parameter and a second DMSO solution was titrated with water for the high end of the solubility parameter range. These solubility parameters and some other solubility data are summarized in Table II. 

For our sample, these equations give a molecular weight of 59,900 and 69,740 for the water and DMSO solutions, respectively, with an average value of 64,850. The molecular weight of the fully substituted polymer would be 240,240. 

Polymers containing pendant carbamate functional groups can be prepared by the reaction of phenyl isocyanate with poly(vinyl alcohol) in homogeneous dimethylsulfoxide solutions using a tri-ethylamine catalyst. These modified polymers are soluble in dimethyl sulfoxide, dimethylacetamide, dimethylformamide and formic acid but are insoluble in water, methanol and xylene. Above about 50% degree of substitution, the polymers are also soluble in acetic acid and butyrolactone. The modified polymers contain aromatic, C = 0, NH and CN bands in the infrared and show a diminished OH absorption. Similar results were noted in the NMR spectroscopy. These modified polymers show a lower specific and intrinsic viscosity in DMSO solutions than does the unmodified poly(vinyl alcohol) and this viscosity decreases as the degree of substitution increases. 

The reaction of the p-nitrophenyl esters with the polymer (4) was studied in dimethyl sulfoxide ( DMSO ) solution in the presence of triethylamine at 25°C. The poly-L-lysine derivatives obtained have different IR absorption spectra from those of the starting compounds, and have absorptions assigned to the nucleic acid bases. Poly( e,N-Ade-L-lysine )(5) was soluble in DMSO and ethylene glycol, and also in water below pH 3, where it was present as a protonated form. In dimethylformamide (... 

Unfortunately, these nonionic but polar fullerene adducts exhibit virtually no water solubility over the whole pH range, indicating that even four polyethylene units are not sufficient to provide tme water solubility. However, as mentioned before for other fulleienes, by diluting DMSO solutions with various amounts of water stable aqueous phases containing dispersed fullerenes can be obtained. 

The reactions with superoxide were studied in DMSO containing a controlled amount of water (.06%), which was in excess over the superoxide and complex concentrations 49). Water present in the DMSO solution plays an important role and enables the catal5rtic decomposition of O2. Under absolute water-free conditions only a stoichiometric reaction between O2 and the complex could be observed and the... 

Nitrobenzoylamino)-2,2-dimethylpropanamide (143 R = Me) reacts in methanol-DMSO solution with sodium methoxide to yield 5,5-dimethyl-2-(4-nitrophenyl)imidazol-4(5//)-one (144 R = Me). The 4-methoxyphenyl derivative and the parent phenyl derivative react similarly, as do compounds in which variation of the 2-substitutent (R = Pr , Ph, 4-O2NC6H4) was made. The mechanism of the cyclization probably involves initial formation of the anion of the alkanamide (145), which adds to the carbonyl group of the benzamido moiety to yield the tetrahedral oxyanion (146) proton transfer and dehydration then yield the heterocycle (144). The kinetics of hydrolysis in water at 70 °C and pH 2-11 of A-glycidylmorpholine (147) have been reported. ... 

The influence of concentration and type of supporting electrolyte [49, 52] and also temperature [50] on the Zn(II) electroreduction was investigated in water-DMSO and water-HMPA mixtures. The change of kinetic parameters under the influence of these factors was similar to that observed in pure aqueous solutions. 

---