Gibbs energy of solution and molecular structural coefficients of 85 solutes on 20 gas chromatographic stationary phases

García-Domínguez, José Antonio; Santiuste, J. M.; Dai, Qiong

doi:10.1016/s0021-9673(97)00625-0

Cited by 10 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, scattering is so large for these straight lines that the straight lines are possibly parallel to the abscissae axis, pointing to negligible effect of the stationary phase polarity. These results, therefore, agree with those in the literature [24,37,38,39,40].…”

Section: Nonpolar Interactions and Connectivity Indicessupporting

confidence: 93%

“…The relationship between sπ H 2 and the solute dipole moment, as well as the relationship between nonpolar interactions and the SP polarity, have been shown. l.logL 16 decreases with increasing SP polarity, while sπ H 2 increases with increasing SP polarity [37,38,39]. The cavity dispersion interaction is, however, usually described as c+l.logL 16 .…”

Section: Nonpolar Interactions and Connectivity Indicesmentioning

confidence: 99%

See 1 more Smart Citation

Interactions between 33 solutes and four cyano-containing stationary phases: gas chromatographic activity coefficients and the solvation parameter model

Santiuste

Takács²

2003

Analytical and Bioanalytical Chemistry

View full text Add to dashboard Cite

Infinite-dilution gas-liquid chromatographic activity coefficients at 393.15 K (with their thermal and athermal components) and derived excess partial molar Gibbs energies, enthalpies, and entropies have been determined for each of 33 solutes of different polarity on four stationary phases with cyano groups, using retention data taken from the literature. The strongest interactions predicted by the solvation model are the dipolarity/polarizability, the acidic solute-basic stationary phase interaction, and nonpolar cavity formation and dispersion. These interactions were compared with those evaluated from the solute activity coefficients; the effect of the solute connectivity index and dipole moment on nonpolar and polar interactions, respectively, is discussed. The dependence of the thermal activity coefficient on nonpolar interactions, and the influence of stationary phase polarity on the four solute-stationary phase interactions, were evaluated. The nonpolar interaction increases with increasing connectivity and with increasing athermal activity coefficient. The dipolarity/polarizability interaction increases with increasing solute dipole moment. Finally, polar interactions increase with increasing stationary phase polarity whereas the nonpolar interaction is independent of stationary phase polarity.

show abstract

Section: Nonpolar Interactions and Connectivity Indicessupporting

confidence: 93%