Syntheses and physical properties of ferrocene derivatives (XIII) - Liquidcrystallinity of omega-[4-(4-methoxyphenoxycarbonyl)phenoxycarbonyl] alkyl4-ferrocenylbenzoate with octyl and nonyl groups as an alkyl one

Two monosubstituted ferrocene derivatives, 8-[4-(4-methoxyphenoxycarbonyl)p henoxycarbonyl]octyl 4-ferrocenylbenzoate (MPAF-8) and 9-[4-(4-methoxypheno xycarbonyl)phenoxycarbonyl] nonyl 4-ferrocenylbenzoate (MPAF-9), were synth esized and their phase transition behavior was studied using a differential scanning calorimeter. a polarizing microscope and an X-ray diffractometer. MPAF-8 exhibited two liquid crystalline phases in both heating and cooling processes at approximately room temperature. In the heating process. a cry stal-crystal phase transition behavior was ascertained. The phase transitio n behavior of MPAF-9 was very similar to that of MPAF-8 except for the beha vior of the crystal-crystal phase transition in the heating process. In MPA F-B. one crystalline phase was transformed into another crystalline phase c ompletely. On the other hand, this transformation was observed in part in M PAF-9, and as a result, the melting behavior was observed two times in the heating process.