Real structure of formamide entrapped by AOT nonaqueous reverse micelles: FT-IR and (super 1)H NMR studies

Article Abstract:

Noninvasive techniques such as FT-IR and (super 1)H NMR spectroscopy are used to investigate the solubilization of formamide (FA) and its aqueous solution (FA-water) by sodium 1,4-bis(2-ethylhexyl)-sulfosuccinate (AOT) in heptane or isooctane reverse micelles, respectively. The comparison of the chemical shift of AOT in reverse micelles with FA and the FA-water mixture in the polar core of the aggregate shows that there is a strong preferential solvation of Na(super +) by FA and the AOT's sulfonate group by water.

Brazil, Fourier transform infrared spectroscopy, Structure

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On the possibility that cyclodextrins' chiral cavities can be available on AOT n-heptane reverse micelles. A UV-visible and induced circular dichroism study

Article Abstract:

Novel sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles (RMs) made with the AOT surfactant, water, n-heptane and two different cyclodextrins (hydroxypropyl (hp)-[beta]-CD and Mod-[beta]-CD) are examined. The results have shown that RMs with a chiral hydrophobic and hydrophilic nanostructured cavity in the same aggregates can be formed and that the cyclodextrin chiral cavity is available for a guest in an organic medium such as the RMs.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Sulfur Compounds, Sulphur compounds, Circular dichroism

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Use of microdevices to determine the diffusion coefficient of electrochemically generated species: application to binary solvent mixtures and micellar solutions

Article Abstract:

A new approach is described for determining the diffusion coefficient (D) of redox species. The values of D for ferrocene and the ferrocenium cation are different and have agreed well with the chemical affinity of both species for the cationic micelle.

Diffusion, Diffusion (Physics), Metallocenes

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