39777-26-9Relevant articles and documents
Phase Transitions in N(p-n-Butoxybenzylidene)p-n-Alkyl Anilines: Densitiy and Refractive Index Studies
Rao, N. V. S.,Potukuchi, D. M.,Pisipati, V. G. K. M.
, p. 71 - 87 (2007/10/02)
The density and refractive index variation with temperature in N(p-n-butoxybenzylidene)p-n-alkylanilines viz., 4O.m compounds for m = 4 to 12 are presented.The density, thermal expansion coefficient and the refractive index results infer first order character for IN, AB and CB transitions and a second order character for NA and AC transitions.Pretransitional effects are discussed at IN and AB transitions.The odd-even effect is observed at both the IN and NA phase transitions.The variation of refractive index anisotropy as a function of temperature, in the nematic phase of the compounds in a homologous series has shown an interesting p henomena.The temperature dependence of nematic refractive index anisotropy yields mean field exponent ν = 1 in the vicinity of NA transition.The influence of molecular chemical constitution, the nematic thermal range and the McMillan parameter values on the order of NA transition is discussed in detail.
