Identification of alkylbenzenes up to C12 by capillary gas chromatography and gas chromatography-mass spectrometry : II. Retention indices on OV-101 columns and retention-molecular structure correlations

Abstract Synthesized multicomponent mixtures of alkylbenzenes with carbon atom numbers greater than ten were analyzed by capillary gas chromatography on the poly(dimethyl silicone) stationary phase OV-101 and gas chromatography-mass spectrometry with electron impact ionization. From the mass spectra acquired, the molecular weights were determined and the alkyl substituents specified. The assignment of the positions of the alkyl substituents of C 11 and C 12 alkylbenzenes was based on correlations between the retention data and molecular structures of alkylbenzenes arranged into homologous series. Retention indices on OV-101 at 1OO°C and temperature coefficients, d I /d T , are given for 34 C 7 –C 10 , 34 C 11 and 42 C 12 alkylbenzenes. The regularities of the chromatographic retention behaviour of alkylbenzenes are summarized.