Part 1: synthesis and visible absorption spectra of some new monoazo dyes derived from ethyl 2-amino-4-(4'-substitutedphenyl)thiophenes.
Series of monoazo dyes from some ethyl 2-amino-4-(4'-substitutedphenyl) thiophenes were prepared and characterized. The structure of the substances was confirmed by FT-IR, (1)H NMR and mass spectroscopic techniques. The relationship among the structure of the dyes, their absorption characteristics and the solvatochromic and halochromic behaviors of the dyes were investigated. Introduction of electron-accepting substituent into the diazo moiety results in large bathochromic shifts in all solvents used. The dyes exhibited positive solvatochromism and their solvatochromic properties were discussed in relation to tautomerism.
Gazi University, Faculty of Science, Department of Chemistry, 06500 Teknikokullar, Ankara, Turkey.
Banu
B
Babür
Gazi University, Faculty of Science, Department of Chemistry, 06500 Teknikokullar, Ankara, Turkey. Electronic address: nertan@gazi.edu.tr.
Nermin
N
Ertan
D000586:Amination; D001391:Azo Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D004396:Coloring Agents / Q000138:chemical synthesis / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D013053:Spectrophotometry; D013876:Thiophenes / Q000138:chemical synthesis / Q000737:chemistry*
D001391:Azo Compounds; D004396:Coloring Agents; D013876:Thiophenes
Absorption spectra; Azo dyes; Halochromism; Solvent effect; Substituent effect; Thiophene