The effects of cyclic terminal groups in 4-aminoazobenzene and related azo dyes. Part 3. Electronic absorption spectra of some monoazo dyes derived from N-phenylmorpholine, N-(phenyl)thiomorpholine, N-(phenyl)thiomorpholine 1,1-dioxide, and N-acetyl-N′-phenylpiperazine
作者:Geoffrey Hallas、Richard Marsden、John D. Hepworth、Donald Mason
DOI:10.1039/p29860000123
日期:——
Monoazo dyes containing a terminal morpholino group absorb hypsochromically in comparision with their piperidino counterparts as a result of electron withdrawal by the oxygen atom. Similar shifts are observed with related dyes possessing other γ-heteroatoms in the donor group. In acid solution, protonation takes place at the β-azo nitrogen atom (azonium tautomer) and at the terminal nitrogen atom (ammonium
含有末端吗啉代基团的单偶氮染料与其哌啶子基染料相比,由于氧原子的电子撤离而被七色吸收。对于在供体组中具有其他γ-杂原子的相关染料,观察到了类似的变化。在酸溶液中,质子化在β-偶氮氮原子(偶氮鎓互变异构体)和末端氮原子(铵互变异构体)上发生,其程度取决于γ-取代基的诱导作用。