Hexabenzocoronenes Bearing Odd Carbon Alkyl Chains as Columnar Discotic Liquid Crystal

摘要

Two HBC derivatives (HBC-C_(13) and HBC-C_(15)), both containing 6 odd-carbon alkyl chains surrounding the rigid plane core, were investigated as discotic liquid crystal. The difference between their thermal behaviors has been investigated by using differential scanning calorimetry (DSC). Their mesomorphic phase behavior was observed by polarizing optical microscopy (POM). A remarkable odd-even effect in the phase transition temperatures was observed for all HBC derivatives (HBC-C12, HBC-C_(13), HBC-C_(14), HBC-C_(15) and HBC-C_(16)).