Abstract
The synthesis of some novel derivatives of 4-[ N,N-bis(β-hydroxyethyl)- amino]azobenzene is reported, and the effects of ortho-substituents on photoinduced trans → cis isomerism about the azo group, mass spectral behavior, and the photost ability of these dyes are described. An ortho-nitro group inhibits trans → cis photo- isomerism about the azo group and affords poor photostability. Those ortho-substituted dyes showing a greater tendency to undergo photoinduced trans → cis isomerism and recover quickly are also more photostable and less subject to rupture at the β-nitrogen- carbon bond in the mass spectrometer. The photolysis experiments were done using acetate and triacetate film and fiber, and the mass spectrometric analyses were done by direct probe using the electron-impact technique.
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