No abstract

Differential scanning calorimetry (DSC) analyses were obtained on a DSC 2910 TA instruments. 1 H NMR and 13 C NMR spectra were obtained with CDCl3 as a solvent on a Varian 300 MHz spectrometer. Chemical shifts are given in parts per million () and are relative to the signal of tetramethylsilane (δ = 0 ppm for 1 H) as internal reference for solutions in CDCl3. FT-IR/ATR spectra were measured using a Varian 640-IR spectrometer between 4000 and 500 cm -1 and with a resolution of 4 cm -1 . All spectra were performed with 16 scans and are given in wavenumbers (cm -1 ).CHN analyses were performed on a Perkin-Elmer 2400 CHN Elemental Analyzer. The melting points, phase transition temperatures and mesomorphic textures were taken using a polarizing optical microscrope (POM) Olympus BX43, equipped with a Mettler Toledo FP82HT Hot Stage with an FP90 Central Processor at a heating/cooling rate of 10 °C min -1 (magnification: 10x).X-ray diffraction (XRD) experiments were performed with the X'Pert-PRO (PANalytical) diffractometer system using the linear monochromatic Cu K1 beam ( = 1.5405 Å), with an applied power of 1.2 kVA. The scans were performed in continuous mode from 2 o to 30 o (2 angle) and diffracted radiation collected with the X'Celerator detector. The powder was placed on a glass plate and the patterns collected at the mesophase temperature, by cooling from the isotropic. The experimental procedure is described following the Scheme I.Scheme I. Preparation of Azobenzenes LC.