1,721,230 research outputs found
Reaction of piperazine with trimethylacetic arylcarboxylic anhydride; A convenient method for preparing monoacylated piperazine derivatives
No full text[[abstract]]A series of monosubstituted piperazine derivatives were obtained by the reaction of piperazine with trimethylacetic arylcarboxylic anhydrides in good yields, which were prepared in situ from arylcarboxylic acid with trimethylacetyl chloride in the presence of triethylamine.[[note]]SC
Synthesis and mesogenic properties of azo-dye liquid crystals
No full text[[abstract]]Azo-dye liquid crystals with strong amino electro-donating and moderately flexible carboxylate electron-withdrawing groups were synthesized, and their mesogenic properties were studied.[[note]]SC
New synthesis of N,N-disubstituted (4-aminophenyl)diazenyl-1,3,4-thiadiazole, and mesogenic study and molecular modeling of its H-bonded complexes with a series of m-alkoxybenzoic acid derivatives
No full text[[abstract]]A new N,N-disubstituted (4-aminophenyl)diazenyl-1,3 4-thiadiazole, an azo dye, was synthesized from the reaction of the 1-decanoyl-4-phenylpiperazine in acetone. in situ, with the diazonium salt prepared from 1,3,4-thiadiazol-2-amine and NaNO2 in H3PO4. The azo dye was found to form complexes with a series of m-alkoxybenzoic acid by intermolecular H-bonding. The mesogenic behavior of the complexes were investigated by polarizing optical microscopy and differential scanning calorimetry. A study of the representing complex by powder X-ray diffraction and molecular modeling was further undertaken to locate the H-bonding position.[[note]]SC
Synthesis and study of azo dye compounds: variation of mesogenic behaviour with length of alkyl chains
No full text[[abstract]]The mesogenic behaviours of two azo dye liquid crystals, 1 and 4, differ because of the different length of terminal alkyl chains; azo dye 1 shows a SmB phase, azo dye 4 shows nematic and SmA phases during thermal processing. The molecular stackings of these two azo dye liquid crystals are compared on the basis of crystallographic studies to explain such unexpected mesogenic behaviour.[[note]]SC
Mesogenic study of the H-bonded complexes of N,N-disubstituted aminophenylazo-(4)-1,3,4-thiadiazole with p-alkoxybenzoic acids
No full text[[abstract]]A 2-diazenyl substituted 1,3,4-thiadiazole formed complexes with a series of p-alkoxybenzoic acid by intermolecular hydrogen bonding. The complexes were investigated by polarizing optical microscopy and differential scanning calorimetry to understand the resulting mesogenic behaviours. A study of the complex by powder XRD and molecular modelling was further undertaken to locate the position of hydrogen bonding.[[note]]SC
Synthesis of a new azo dye sensor and its chelation with Ag+
No full text[[abstract]]A new azo dye containing thiadiazoline ring was synthesized from the reaction of the diazobenzaldehyde with O-aminothiophenol, which was characterized by NMR, IR spectroscopy and high resolution mass spectrometry. This dye compound can chelatc Ag+ in CH2C[[note]]SC
Levelized cost of electricity considering electrochemical energy storage cycle-life degradations
No full textCost benefit analysis and data analytics for renewable energy and electrical energy storage
No full textVariation in molecular stacking resulting from the different polarity of liquid crystalline molecules: synthesis and study of azo dye compounds
No full text[[abstract]]To investigate the effect of molecular polarity on the packing of liquid crystalline molecules, two liquid crystals, N,N-disubstituted aminophenylazo-4-alkylbenzenes, were synthesized and studied by single crystal structure determination. A comparison of the resulting molecular stacking with that of N, N-disubstituted aminophenylazo-4-butylbenzoate was made.[[note]]SC
Single crystal XRD study of 4,4-dipyridyl - p-ethoxybenzoic acid and N,N-dipyridylpiperazine - p-ethoxybenzoic acid co-crystals: Direct evidence of H-bond interaction in the corresponding liquid-crystalline mesogenic phases
No full text- …
