Summary
The retention index of a planar polynuclear aromatic hydrocarbon on the GC phases OV-101, SE-52, and OV-17 is strictly related only to the boiling point, and less closely to the relative molecular mass. The very approximates relation with connectivity index ins only a consequence of the latter. On a nematic lqiuid crystal phase, a variation of activity coefficient, expressed in terms of a shape factor, also influences the retention of PAH.
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Bartle, K.D., Lee, M.L. & Wise, S.A. Factors affecting the retention of polycyclic aromatic hydrocarbons in gas chromatography. Chromatographia 14, 69–72 (1981). https://doi.org/10.1007/BF02279514
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DOI: https://doi.org/10.1007/BF02279514