The synthesis and liquid crystal properties of eighteen members of the homologous series of 4′-alkoxy-2,2′,3,3′,5,5′,6,6′-octafluorobiphenyl-4-yl-trans-4-alkylcyclohexane-1-carboxylates are reported. The compounds are low melting nematogens possessing a moderately wide N-I range and have refractive indices comparable with that of fused silica. Because of these properties the compounds may have a potential use as additives to mixtures for the TN mode or in applications where nematogens with a uniquely low refractive index are required.