Syntheses and physical properties of ferrocene derivatives (XIV) dynamic viscoelastic property of liquid crystalline ferrocene derivatives containingcholesteryl group as a mesogenic one

The dynamic viscoelastic properties for [4-[omega-(cholesteryloxy carbonyl) alkoxycarbonyl]phenyl]ferrocenes with hexyloxy and octyloxy groups as an al koxyl group were measured as functions of temperature and frequency. These samples showed liquid crystallinity. The results obtained here suggest that a kind of molecular order exists in the temperature range from the clearin g point to about 20 degrees above it, in the liquid phase. Furthermore, the values of apparent activation energy in the liquid crystalline phase are a s large as those of a primary dispersion of polymers, and its activation en ergy is not affected by the structural change at the clearing point.