7,10-Diphenylfluoranthene grafted polysiloxane as a highly selective stationary phase for gas chromatography.

A novel 7,10-diphenylfluoranthene grafted polysiloxane (DPFP) was synthesized and statically coated on a fused-silica capillary column. High column efficiency (3864 plates per m) was achieved for naphthalene at 120°C. Thermo-gravimetric analysis showed that the DPFP polymer began to decompose at 380°C. The chromatogram of polyethylene pyrolysis products indicated that the maximum allowable temperature of the DPFP column could reach 360°C. By relying on its specific π-π stacking and dipole-induced dipole interactions with aromatic solutes, the DPFP stationary phase achieved excellent resolution for substituted benzene and aromatic hydrocarbons with satisfactory peak shapes, as well as showed superiority to current stationary phases that failed to resolve some critical pairs. Moreover, DPFP also showed good selectivity and resolving ability for Grob test mixtures, fatty acid esters, and ethers.