Synthesis, characterization and intramolecular cyclisation study of three new liquid crystals

B. Saïdat, M. H. Guermouche, J.-P. Bayle
2004 Journal de Physique IV : Proceedings  
Internal cyclization of three new phenyldiazene liquid crystals (R is an alkyl substituent with 4, 6 or 8 carbons) with activated methylene group in the ortho position to the diazo linkage was studied . The initial liquid crystals was synthesised and characterized by 1 H NMR, electrospray mass spectrometry and differential scanning calorimetry. The final compound was characterized by 1 H NMR and differential scanning calorimetry. The kinetic of cyclization was studied at different temperatures
more » ... erent temperatures and followed by reversed phase HPLC and a UV detection. For all the temperatures used, it appeared that the cyclisation was a first order reaction for the three compounds. The Arrhenius plot (ln reaction constant k against 1000/T) gave the mean activation energy of the cyclisation.
doi:10.1051/jp4:2004122026 fatcat:c26yf2zm3reglirfoonvgadmm4