Syntheses and Physical Properties of Liquid Crystals Containing Ferrocene (XX) : A study on a steric effect on a liquid crystalline formation of liquid crystalline ferrocene derivatives for using a dynamic viscoelastic measurment

Abstract

A new compounds, 4-[ω-(cholesteryloxycarbonyl)alkoxycarbonyl]biphenyl(CABP-n, where n is the carbon number of the flexible chain), were synthesized and their dynamic viscoelastic properties were measured. The results obtained here were discussed with those of [4-[ω-(cholesteryloxycarbonyl)alkoxycarbonyl]phenyll ferrocene(CAPF-n, where n is the carboll number of the flexible chain) from point of view of a steric effect of ferrocenyl group. The storage modulus of elasticity (G') of CAPF・9 was changed continuously around the clearing temperature, while an abrupt change of G' was observed at clearing temperature in CABP-9. It is considered that the continuous changing of G' in CAPF-n at around Tcl is attributed to be a steric effect of ferrocenyl group.