Hydration of simple amides. FTIR spectra of HDO and theoretical studies

Article Abstract:

The hydration of simple formamide (F), N-methylformamide (NMF), N,N-dimethylformamide (DMF), acetamide (A), N-methylacetamide (NMA) and N,N'-dimethylacetamide (DMA) is analyzed in aqueous solutions by using Fourier transform infrared (FTIR) spectra of HDO isotopically diluted in [H.sub.2]O. The increased stability of the hydration sphere of NMA relative to DMA and of NMF relative to DMF has its origin in different geometries and also the stability of water cages containing the amides.

Technology application, Optical properties, Amides, Hydration (Chemistry)

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Hydration sphere of tetrabutylammonium cation. FTIR studies of HDO spectra

Article Abstract:

Fourier transform infrared spectroscopy is used to study the hydration of tetrabutylammonium cation, Bu4N+, in aqueous solutions of Bu4NBr, Bu4NCl and BU4NF salts. It is shown that the energetic state of water H-bonds and water O...O distances are similar to the one for bulk water. However, the population of H-bonds around the cation is larger. Hydrophobic hydration is also considered an entropy effect.

Research, Hydration, Rehydration solutions, Cations

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Ion hydration in LiPF6, NaPF6 and KPF6 aqueous solutions derived from infrared HDO spectra

Article Abstract:

Hydration of KPF6, NaPF6, and LiPF6 is studied in aqueous solutions by means of FTIR spectra of HDO isotopically diluted in H2O. Results shows that the outermost hydration sphere of cations, which is possible to detect with IR spectroscopy, depends on the kind of anion.

All Other Basic Inorganic Chemical Manufacturing, Phosphorus & Compounds, Fluorine compounds, Phosphorus compounds, Aqueous solution reactions

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