Synthesis, solvatochromic properties and biological evaluation of some novel azo-hydrazone tautomeric dyes
作者:Asadollah Mohammadi、Hossein Ghafoori、Bahram Ghalami-Choobar、Reyhaneh Rohinejad
DOI:10.1016/j.molliq.2014.07.005
日期:2014.10
Five novel azo-hydrazone tautomeric dyes 3a-e were synthesized in two steps using Knoevenagel condensation and azo coupling reaction. The structures of the new compounds were confirmed by UV-vis, IR and NMR spectroscopies. Spectral data indicated that these dyes exist predominantly in the hydrazone tautomeric form in solutions. In addition, the absorption ability of the dyes showed that the solvent effect on UV-vis absorption spectra is complex and effectively depends on the nature of the substituent on the diazo component. The effects of acidic and basic media on the visible absorption spectra of the dyes were also examined. The antibacterial and antioxidant activities of the dyes were characterized using the agar well diffusion and ferric reducing antioxidant power (FRAP) methods, respectively. The synthesized dyes exhibited both antioxidant and antibacterial activities. (C) 2014 Elsevier B.V. All rights reserved.