Relation between the structure of organic compounds and their retention time in gas chromatography

Retention indexes of alkanes and alkenes on 2 stationary phases (octadecene and dimethylsulfolane, at 25 Deg) were plotted on diagrams in which the index on an apolar phase is one and the index on a polar phase is the other axis. Branched isomers were spread along parallel lines in a repeated pattern; the \"roofing tile effect.\" Data were also plotted for Me carboxylates, the stationary phases being squalane and polypropylene sebacate, for C13-19 cyclohexyl and Ph alkanes Apiezon and polyphenyl ether; there was a const. shift due to change of cyclohexyl to Ph. A close relationship was found between structure and retention time of isomeric pentanols, hexanols, cycloalkanes, and alkenes. [on SciFinder (R)]