Showing papers by "Bachcha Singh published in 2013"
TL;DR: In this paper, a series of Schiff base calamitic liquid crystal; methyl 4-(4′-nalkoxybenzylideneamino)benzoate (MABAB), H2n+1C n OC6H4C(H)=NC6H 4COOCH3 (n = 6, 8, 10, 12, 14, 16) has been synthesized and characterised by elemental analyses, Fourier transform infrared spectroscopy (FT-IR), 1H and 13C Nuclear Magnetic Resonance (NMR) spectrograph
Abstract: A new series of Schiff base calamitic liquid crystal; methyl 4-(4′-n-alkoxybenzylideneamino)benzoate (MABAB), H2n+1C n OC6H4C(H)=NC6H4COOCH3 (n = 6, 8, 10, 12, 14, 16) has been synthesised and characterised by elemental analyses, Fourier transform infrared spectroscopy (FT-IR), 1H and 13C Nuclear Magnetic Resonance (NMR) spectroscopy. The mesomorphic properties of these compounds were studied by differential scanning calorimetry (DSC) and polarising optical microscopy (POM). All members of the series exhibit enantiotropic smectic A (SmA) mesophase. Temperature-dependent micro-Raman study of one of the members, MABAB-10 has been employed to identify phase transitions and the molecular rearrangement therein. Analysis of Raman marker bands; C–H in-plane bending, C–C stretching of phenyl rings and –C(H)=N– linking group of core confirms the transitions clearly as observed through DSC and POM. An in situ Raman measurement of C–H in-plane bending mode has also been performed to visualise the molecular changes m...
22 citations
TL;DR: In this article, a new liquid crystalline material containing diester linking group ethyl-[4-(4′-decyloxy)benzoyloxy]-benzoate (4-EDBB) was synthesized.
15 citations
TL;DR: The Raman, IR and DFT study confirm that Cu metal has good binding affinity to the isolated adenine base.
9 citations
TL;DR: A new series of Schiff's base mesogenic ligands with a polar methyl ester as an end group, methyl 4-(4′-(alkoxy)-2 hydroxybenzylideneamino) benzoates, CnLH (n = 6, 8, 10, 12, 14, 16) and their copper(II and nickel(II) complexes have been synthesized They were characterized by elemental analyses, Fourier transform infrared (FT-IR), 1H and 13C nuclear magnetic resonance, and UV-VIS spectroscopy as discussed by the authors.
Abstract: A new series of Schiff's base mesogenic ligands with a polar methyl ester as an end group, methyl 4-(4′-(alkoxy)-2 hydroxybenzylideneamino) benzoates, CnLH (n = 6, 8, 10, 12, 14, 16) and their copper(II) and nickel(II) complexes have been synthesized They were characterized by elemental analyses, Fourier transform infrared (FT-IR), 1H and 13C nuclear magnetic resonance, and UV-VIS spectroscopy The mesomorphic properties of these compounds were investigated by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) The ligands exhibit an enantiotropic SmA mesophase with a high-temperature range and thermal stability The square planar copper(II) complexes show enantiotropic SmA mesophase, but the nickel(II) complexes are nonmesogenic in nature The thermal stability of the compounds was also determined by thermo gravimetric analyses Density functional theory (DFT) calculations were performed using GAUSSIAN-03 program at B3LYP level to obtain the stable electronic structure of th
5 citations