Part 1: synthesis and visible absorption spectra of some new monoazo dyes derived from ethyl 2-amino-4-(4'-substitutedphenyl)thiophenes.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014;
131:319-328. [PMID:
24835934 DOI:
10.1016/j.saa.2014.04.042]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 04/07/2014] [Indexed: 06/03/2023]
Abstract
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.
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