Performance analysis and negative dielectric anisotropy behavior of nematic liquid crystal doped with newly synthesized 1-(p-chlorobenzyl)-5-nitrobenzimidazole cobalt complex

Synthesis a group of 5(6)‐substituted benzimidazole Zn(II) and Co(II) complexes and investigation their cytotoxic and antimicrobial activities

“…Structures of compounds were characterized via measurement techniques. Results of 1 H NMR, 13 C NMR, IR, UV-Vis, and elemental analysis values are in accord with the literature data [9]. The 1 H NMR spectra values of benzimidazole ligand and diamagnetic zinc(II) complexes were given in the experimental section.…”

“…There are two values instead of one value for chemical shifts of functional groups because of the 5(6) tautomerization of benzimidazole ligand [10]. Also, in 13 C NMR spectra of compounds 3 and 5 specific chemical shifts values of NCHN and CH 2 groups were observed at 144.6, 144.4, and 145.2144.9;47.4, 47.9, and 47.8 ppm. The ν(C═N) stretching frequencies of imino groups of benzimidazole rings were observed as expected at 1491, 1516, 1490, 1491, and 1494 cm À1 for new compounds (3, 4, 5, 6, and 8).…”

“…All of the reactions were carried out in atmospheric conditions. Starting materials and reagents used in reactions were supplied commercially from Aldrich or Merck Chemical Co. 1 H-NMR (300, 400 MHz) and 13 C-NMR (75, 100 MHz) spectra were recorded using a Bruker Avance 300 MHz Ultrashield and Bruker Avence III 400 MHz FT NMR spectrometer. Infrared (IR) spectra were recorded using an ATR unit from 4000 to 200 cm À1 on a Perkin-Elmer FT-IR spectrophotometer.…”

“…Magnetic measurements were carried out on a Sherwood Scientific apparatus at room temperature by Gouy's method using 3) ligands. Compounds 1, 2, and 7 according to the literature [13] (Figure 1).…”

Electro-optical Performance Investigation of Cholesteric Liquid Crystal Containing Azo Dye: Light Shutter Device Application

“…This method provides information about the polarization response of composites as a result of molecular interactions between the materials in the composites under an external electric field. The complex dielectric constant is expressed with real (e¢) and imaginary (e¢¢) parts and is given as the following equation, [23][24][25][26][27] e à ¼ e 0 À ie 00 ð2Þ…”