Novel azo disperse dyes derived from N-benzyl–N-ethyl–aniline: Synthesis, solvatochromic and optical properties

Volumetric, ultrasonic and UV absorption studies on interactions of antibiotic drug chloramphenicol with glycine and its dipeptide in aqueous solutions at T = (288.15–318.15) K

“…So, partial molar volume of transfer and partial molar isentropic compression of transfer can be expressed as follows: causes extended conjugation resonance [85]. This effect is attributed to the increase in interactions of glycine and its dipeptide with aqueous chloramphenicol solutions that clearly supports and justifies our thermodynamic data.…”

Intermolecular interactions of α-amino acids and glycyl dipeptides with the drug domiphen bromide in aqueous solutions analyzed by volumetric and UV–vis spectroscopy methods

“…S2 shows that the absorption maximum for different amino acids and dipeptide in 0.0450 mmolÁdm À3 aqueous DB solution follows the sequence: glycyl-Lleucine > glycyl-L-valine > glycylglycine > L-leucine > L-valine > Lalanine > glycine. The bathochromic shift observed in case of amino acids/dipeptides with DB concentration indicates the coordination of ions of DB with amino acids/dipeptide by breaking the solvent layers of water that causes extended conjugation resonance [39,3]. This effect is attributed to the increase in interactions between amino acids/dipeptides and DB that clearly supports and justifies our volumetric data.…”

Novel push–pull heterocyclic azo disperse dyes containing piperazine moiety: Synthesis, spectral properties, antioxidant activity and dyeing performance on polyester fibers

“…The diazonium salts were prepared in good yield from equimolar mixture of corresponding heterocyclic aromatic amines (2a-f) and nitrous acid according to the previously described methods [14]. After completion of diazotization, the azo liquor was slowly added to a stirred solution of 1-(4-bromobenzyl)-4-phenylpiperazine (1) dissolved in 10 mL of glacial acetic acid and 2-3 mL of DMF in acidic medium by adjusting the pH at 5.5-6.0 and the temperature was maintained at 0-4 °C.…”

“…Furthermore, push-pull azo dyes with heterocyclic components as disperse colorants have been intensively investigated to produce bright and strong color shades on synthetic textile fibers. These results led to the development of commercial products which replaced the conventional azo-benzene disperse dyes [11][12][13][14][15][16][17].…”