P.Pardhasaradhi , V. G. K. M. Pisipati , P. V. Datta Prasad
Temperature gradient of refractive indices, dne/dT and dno/dT of a number of symmetric dimeric liquid crystals m.OnO.m compounds namely ?,?-bis(p-n-alkylanilinebenzylidene-p'-oxy) alkanes are estimated using the refractive index data. Most of these materials show nematic phase except very few compounds. All these compounds exhibit more than 100 OC clearing temperatures due to the presence of second monomer. The TCO exhibits even odd effect with the spacer ‘n’ and alkyl chain number ‘m’ values.
Symmetric Dimeric Liquid Crystals, Temperature Gradient of Refractive Indices, Cross Over Temperatures.