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  • 1
    Digitale Medien
    Digitale Medien
    Volumes and heat capacities of water andN-methylformamide in mixtures of these solvents (1977)
    Springer
    Journal of solution chemistry 6 (1977), S. 571-580 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Densities ; apparent molar volumes ; heat capacities ; apparent molar heat capacities ; binary aqueous solutions ; N-methylformamide ; water ; amides
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The densities of mixtures ofN-methylformamide (NMF) and water (W) have been measured at 5, 15, 25, 35, and 45°C, and the heat capacities of the same system at 25°C, both over the whole mole-fraction range. From the experimental data the apparent molar volumes (Φv) and heat capacities (Φc) of NMF and of water are evaluated. The relatively small difference between the partial molar volumes or heat capacities at infinite dilution and the corresponding molar volumes or heat capacities of the pure liquids for both NMF and water suggests that with regard to these quantities replacement of a NMF molecule by a water molecule or vice versa produces no drastic changes. The partial molar volume of water at infinite dilution in NMF is smaller than the molar volume of pure water, but the corresponding partial molar heat capacity is unexpectedly high.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00655371
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  • 2
    Digitale Medien
    Digitale Medien
    Hydrophobic hydration of some different types of quaternary ammonium bromides in mixtures of water andN,N-dimethylformamide (1979)
    Springer
    Journal of solution chemistry 8 (1979), S. 25-34 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Enthalpies of solution ; hydrophobic hydration ; quaternary ammonium bromides ; solvent mixtures ; water and DMF
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Enthalpies of solution of methyltributylammonium bromide, tetraethanolammonium bromide, and three azoniaspiroalkane bromides in binary solvent mixtures of water and N,N-dimethylformamide have been measured calorimetrically at 298.15oK over the whole mole fraction range. The results are interpreted in terms of a simple hydration model with two parameters and compared with those of the corresponding tetraalkylammonium bromides. Enthalpic studies with different types of quaternary ammonium bromides are useful in reexamining the assumptions and limitations of the hydration model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00646806
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  • 3
    Digitale Medien
    Digitale Medien
    Solvation and hydrophobic hydration of different types of alkylamines inN,N-dimethylformamide and water mixtures (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 533-547 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Enthalpies of solution ; enthalpies of transfer ; alkylamines ; DMF-water mixtures ; DMF-NMF mixtures ; hydrophobic hydration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Enthalpies of solution of twelve amines of different type have been determined at 25°C in mixtures of N,N-dimethylformamide and water over the whole composition range. The enthalpies of transfer from water to the mixtures deviate substantially from a linear dependence on the mole fraction of water. These deviations appear to contain additive contributions of the different alkyl groups. By application of a simple hydration model the enthalpic effect of hydrophobic hydration has been calculated for each amine. For alkylamines this is determined by the number and size of the alkyl groups present in the molecule. The contribution of each alkyl group is the same in primary, secondary and tertiary amines. Results for the different alkyl groups show a close relationship with values for alcohols obtained previously. Differences between alcohols and amines can be attributed to differences in the hydrophobic hydration of the parts of the solute molecules which are adjacent to the polar group. The influence of the polar group does not seem to extend beyond the second carbon atom.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00646934
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  • 4
    Digitale Medien
    Digitale Medien
    Heat capacities and volumes of NaI in mixtures of dimethylformamide and several non-electrolytes (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 923-936 
    Details
    ISSN: 1572-8927
    Schlagwort(e): NaI ; apparent molar heat capacities ; apparent molar volumes ; DMF-nonelectrolyte mixtures
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Heat capacities and densities of solutions of NaI in mixtures of N,N-dimethylformanide (DMF) with isobutanol, formamide, acetone, tetrahydrofuran, ethylene glycol, 2-methoxyethanol, n-propanol and benzo-15-crown-5-ether have been measured at 25°C. The apparent molar volumes of NaI in mixtures of DMF with isobutanol, formamide, ethylene glycol, n-propanol, and 2-methoxyethanol increase with the amount of these non-electrolytes, while in the systems containing acetone, tetrahydrofuran and benzo-15-crown-5 ether a decrease is observed. The apparent molar heat capacity of NaI in the system containing the crown ether is higher than that in pure DMF. In all other cases Cp,ϕ of NaI decreases with the amount of non-electrolyte. Finally, the non-ideal contributions to heat capacity and volume as a result of the interaction between pairs of unlike solutes, respectively cXY and vXY with X=NaI and Y=non-electrolyte, are calculated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00653077
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