Dielectric investigations of a racemic AFLC host (+/-)-12F1M7

Dielectric spectra of a racemic liquid crystal (+/-)12F1M7 synthezised rece ntly were measured as a function of temperature on planar and homeotropical ly aligned samples. The complex dielectric behaviour inside the apparent me sogenic phases studied is presented. Cells prepared on gold-coated glass su bstrates were used to obtain good characteristics in a wide frequency and t emperature range. Additionally transparent indium-tin-oxide (ITO) with rubb ed polyimide-coated glass substrates were also used for surface aligned sam ples. A pronounced difference between "ITO" and "gold" cells emerges due to surface conditions. The results are discussed with respect to earlier meas urements on optically pure S(+)-12F1M7.