Gas chromatographic retention behavior of polycyclic aromatic sulfur heterocyclic compounds, (dibenzothiophene, naphtho[b]thiophenes, benzo[b]naphthothiophenes and alkyl-substituted derivatives) on stationary phases of different selectivity

Retention indices for 80 polycyclic aromatic sulfur heterocyclic compounds (PASHs) were determined by using high-resolution capillary gas chromatograp hy (GC) with three different stationary phases: a 5% (mole fraction) phenyl -substituted methylpolysiloxane column, a 50% (mole fraction) phenyl-substi tuted methylpolysiloxane column and a smectic Liquid crystalline column. Re tention data were obtained for the following PASHs: dibenzothiophene, 28 al kyldibenzothiophenes, naphtho[1,2-b]thiophene, seven of the eight possible methylnaphtho[1,2-b]thiophenes, naphtho[2,1-b]thiophene, all eight methylna phtho[2, 1-b]thiophenes, naphtho[2,3-b]thiophene, the three benzo[b]naphtho thiophene isomers (benzo[b]naphtho[1,2-d]thiophene, benzo[b]naphtho[2,1-d]t hiophene and benzo[b]naphtho[2,3-d]thiophene), and all 30 possible methylbe nzo[b]naphthothiophene isomers. Molecular descriptors [length, breadth, thi ckness (T), and length-to-breadth ratio (LIB)] were calculated for all the compounds studied. Correlations for retention on the liquid crystalline pha se and solute geometry (LIB and T) ratios were investigated, and the retent ion was found to be highly correlated with LIE resulting in correlation coe fficients ranging from r = 0.68 to r = 0.98. Published by Elsevier Science B.V.