79945-47-4Relevant academic research and scientific papers
SYNTHESIS AND LIQUID CRYSTAL PROPERTIES OF SUBSTITUTED 5-(ARYLCARBONYLOXY)-2-(p-CYANOPHENYL)PYRIMIDINES
Mikhaleva, M. A.,Igonina, G. A.,Savel'ev, V. A.
, p. 320 - 325 (1995)
Liquid crystal p-substituted benzoates, biphenylcarboxylates, and benzoyloxybenzoates were obtained on the basis of 5-hydroxy-2-(p-cyanophenyl)pyrimidine.The development of nematogenicity by the esters due to the p-cyanophenyl grouping was noted, and the appearance of the smectic mesophase by the variation of the ring framework of the acid fragment of the molecule was investigated.
4-(4-n-heptylbenzoyloxy)benzoic Acid
Blake, Alexander J.,Fallis, Ian A.,Parsons, Simon,Schroeder, Martin,Bruce, Duncan W.
, p. 194 - 197 (1996)
In the title compound, C21H24O4, the molecules exist as hydrogen-bonded dimers. The hydrogen bonds occur pairwise, involve the carboxylic acid groups and are of the form C=O...HO-C. The O...O distances are 2.53 (1) and 2.5
Nematic phases of bent-core mesogens
Keith, Christina,Lehmann, Anne,Baumeister, Ute,Prehm, Marko,Tschierske, Carsten
body text, p. 1704 - 1721 (2011/10/19)
Bent-core mesogens derived from 4-cyanoresorcinol with terminal alkyl chains have been synthesized and investigated by polarizing microscopy, XRD and electro-optical methods. Short chain compounds have exclusively nematic phases which can be cooled to ambient temperature. These nematic phases are similar to ordinary nematic phases with only nearest neighbour correlation (N) whereas long chain compounds form SmC-type cybotactic clusters and these cybotactic nematic phases (NcybC) can be regarded as strongly fragmented SmC phases. The chain length dependent as well as temperature dependent structural transition from N to NcybC is continuous and associated with a change of the position and intensity of the small angle scattering in the XRD patterns. Moreover, a temperature dependent stepwise transition from cybotactic nematic phases to different types of non-polar and tilted smectic phases (SmC (I) and SmC(II)) is observed with a mesophase composed of elongated, but not yet fused cybotactic clusters (CybC) as an intermediate state of this transition. This improves the understanding of the nature and special properties of the nematic phases formed by bent-core molecules as well as their transition to smectic phases and it paves the way to new materials with spontaneous or field-induced biaxial nematic phases at ambient temperatures.
