The fluorophobic effect of highly fluorinated alkyl terminal chain of rod-like molecule can efficiently promote the formation of semctic phase and improve the stability of mesophase. In order to investigate the influence of semi-fluorinated chain on mesomorphism of disctoic molecules, a series of new triphenylene derivatives C₁₈H₆(OC_nH_2n＋1)₅(OCOC₂H₄C₆F₁₃) with a semi-fluorinated chain, and their hydrocarbon analogues, C₁₈H₆(OC_nH_2n＋1)₅(OCOC₈H₁₇), n＝4～9, were synthesized. Studies of DSC and POM texture observations revealed that these triphenylene derivatives showed enantiotropic hexagonal columnar mesophases. Compared with the hydrocarbon ester chain, the semi-fluorinated ester chain increased the melting points and clearing points, and stabilized the columnar mesophase of triphenylene discogens.

Key words: triphenylene, discotic liquid crystal, perfluorinated chain, columnar mesophase