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Linear Correlations of the Gas Chromatographic Retention Indices of Compounds from Various Taxonomic Groups

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Abstract

Despite the constant improvement of complex computer algorithms for the calculation of gas chromatographic retention indices (RIs), the simplest methods for their evaluation based on linear correlations between the indices of structural analogs from different taxonomic groups, RI1 ≈ aRI2 + b, remain important. It is shown that symbatic variations of the first numerical differences of retention indices, \(\Delta _{{{\text{RI}}}}^{1}\) = RIn + 1 – RIn (equivalent to the first derivatives of the retention indices with respect to the structural parameter varied in the group), are the conditions of correctness for such correlations in the simplest groups (substituted methanes). A monotonic variation of \(\Delta _{{{\text{RI}}}}^{1}\) in one of the groups with the presence of extrema in the other group is an unequivocal sign of the absence of a linear correlation between retention indices. If the values of \(\Delta _{{{\text{RI}}}}^{1}\) in one of the groups increase and decrease in the other, the ranking order of compounds in any one of them should be reversed. It is shown that the simplest relationship RI1 ≈ aRI2 + b is also applicable to more complex taxonomic groups (substituted ethanes, benzenes, and naphthalenes), and it allows one not only to estimate the RIs of compounds not yet characterized but also to refine known reference data.

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Notes

  1. Topological analogs of substituted methanes are, for example, substituted silanes.

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  1. Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russia

    I. G. Zenkevich

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Translated by V. Makhlyarchuk

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Zenkevich, I.G. Linear Correlations of the Gas Chromatographic Retention Indices of Compounds from Various Taxonomic Groups. J Anal Chem 78, 766–775 (2023). https://doi.org/10.1134/S1061934823040160

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