121995-34-4Relevant academic research and scientific papers
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.
Phase Transition Studies in 40.12
Potukuchi, D. M.,Prabhakar, K.,Rao, N. V. S.,Pisipati, V. G. K. M.,Saran, D.
, p. 181 - 190 (2007/10/02)
The compound N(p-n-butyloxy benzylidene) p-n-dodecyl aniline, 40.12, a higher homologue of 4O.m in the nO.m series, exhibits a phase sequence of NAB.The synthesis and the characterization of the phases are presented.The nature of the phase transitions are determined from the temperature dependence of density and ultrasonic velocity.The nematic-smectic A transition is found to be a weak first order tending to a second order.The results are discussed in the light of the available data on other nO.m compounds.
