Summary
The free energy of partition of a methylene group\(\Delta G_{CH_2 }^ \circ \) is constant within a homologous series down to C5 and nearly constant to C3, contrary to the finding of Golovnya and Grigoryeva [5]. Retention indices are linear with carbon number: values may be extrapolated from higher carbon numbers to C5 within experimental uncertainty, to C4 with error no greater than 5 units and to C3 with error no greater than 10 units. Error in extrapolating the logarithm of the adjusted retention time, log t′R, to C5 is thus negligible, to C4 has possible error up to 5b/100 and to C3 up to 10b/100, whereb is the slope of the plot of log t′R against carbon number.
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Hawkes, S.J. Uncertainty resulting from inconstancy in the slope of the log plot of homologous series. Chromatographia 28, 237–240 (1989). https://doi.org/10.1007/BF02260767
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DOI: https://doi.org/10.1007/BF02260767