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NMR Studies of Ion Solvation in Non-Aqueous Solvents

It is not surprising that NMR was also applied to the study of cation solvation in non-aqueous media. Most solvent molecules contain protons, but in the case of [Pg.223]

Another method of examining ion-solvent interactions is to study the chemical shifts of the solute ions. This type of investigation has been carried out for the Li +, 2 Na+, and TP cations and for the CP, Br , and P anions. [Pg.224]

Solvation of the halide ions in various solvents has been studied by measuring the chemical shifts for Cl , Br , and 1 in water and several other polar solvents [23]. The chemical shifts are strongly solvent dependent and correlate to the UV absorption band energy corresponding to charge transfer to the solvent. [Pg.225]

Polar molecular solutes have been used to probe the donor-acceptor properties of polar solvents. chemical shifts have been measured for interaction between trifluoroiodomethane and the solvent molecule as electron pair donor [24]. As interaction between the donor molecule and the iodine atom in this molecule increases, electron density at the fluorine atoms increases with a resulting positive chemical shift in the NMR signal. An excellent correlation between these shifts and the Gutmann donor number was reported [24]. [Pg.226]

The chemical shifts in triethylphosphine oxide measured in polar solvents is used to define the acceptor number scale for solvent acidity [25]. In this case, the oxygen atom in the P=0 bond acts as an electron pair donor to the solvent as a Lewis acid. The resulting inductive effect lowers the electron density at the phosphorus atom and results in a chemical shift which depends on solvent acidity. [Pg.226]


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Aqueous ions

In aqueous solvents

Ion solvation

Ions, NMR

Non-aqueous

Non-aqueous solvation

Non-aqueous solvents

Non-solvent

Solvate ions

Solvation of ions

Solvation studies

Solvation/solvents

Solvent aqueous

Solvent solvating

Solvent studies

Solvents, NMR

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