Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Solvation of ions. XXVII. Comparison of methods to calculate single ion free energies of transfer in mixed solvents (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 847-861 
    Details
    ISSN: 1572-8927
    Keywords: Single ion free energies of transfer ; tetraphenylarsonium tetraphenylboride assumption ; liquid junction potential assumption ; Ag+ ion ; acetonitrile ; dimethylsulfoxide ; dimethylformamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Free energies of transfer of ions from water to mixtures of water with acetonitrile (AN), with dimethylformamide (DMF), with dimethylsulfoxide (DMSO), and with ethylene glycol have been determined using both the tetraphenylarsonium tetraphenylboride [TATB] and the negligible liquid junction potential [E j ] assumptions. By making use of ΔG tr (Ag+)[TATB]=12 kJ-mol−1 for transfer from DMSO to AN and by assuming negligible liquid junction potential in the cell $${\text{Ag|AgNO}}_{\text{3}} {\text{(0}}{\text{.01}}M{\text{),S}}\parallel {\text{Et}}_{\text{4}} {\text{NPic(0}}{\text{.1}}M{\text{),AN}}\parallel {\text{AgNO}}_{\text{3}} {\text{(0}}{\text{.01}}M{\text{),AN|Ag}}$$ single ion free energies of transfer of silver ion ΔG tr (Ag+)[E j ] from DMSO to 35 pure and mixed solvents show a standard deviation of only 2 kJ-mol−1 when compared with ΔG tr (Ag+) calculated from the TATB assumption that ΔG tr (Ph 4 As+)=ΔG tr (Ph 4 B−). The ferrocene assumption [Fc] also gives acceptable agreement with ΔG tr (Ag+)[TATB] provided that the solvents are not highly aqueous. Other cells with other junctions give less acceptable agreement between the E j and TATB assumptions. It is essential that the salt bridge is always tetraethylammonium picrate in AN, if the E j assumption is assumed. Because of the ease of making potentiometric measurements compared with the difficulty of measurements required for the TATB assumption, the negligible liquid junction potential method in the cell shown is recommended for estimating transfer free energies of single ions. The ferrocene assumption is acceptable only for non-structured aprotic solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649297
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Solvation of ions, part XXX. Thermodynamics of transfer of copper ions from water to solvent mixtures (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 495-508 
    Details
    ISSN: 1572-8927
    Keywords: Thermodynamic transfer quantities ; acetonitrile ; pyridine ; 2-hydroxycyanoethane ; aqueous organic solvent mixtures ; Cu2+, Cu+, and Ag+ ions ; hydrometallurgy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Free energies and Walden products show that the Cu+ and Ag+ ions are specifically solvated by acetonitrile (AN), 2-hydroxycyanoethane (HAN), and by pyridine (Py) whereas Na+ is specifically solvated by water, in mixtures of these organics with water. The Cu2+ ion is specifically solvated by pyridine in pyridine-water mixtures, but by water in acetonitrile-water mixtures. Ion-solvent, coordinated solvent-bulk solvent, and solvent-solvent interactions produce large entropy losses in the order Cu+≫Ag+〉Na+ for transfer of these ions from water to dilute acetonitrile-water. The metallurgically important oxidations of copper, silver, CuS and Cu2 with CuSO4 in water are strongly favored in an enthalpic and free energy sense by the addition of acetonitrile, but addition of acetonitrile also produces a large loss of entropy for the reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647111
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...