An exploration of triarylmethane leucohydroxides

To explore the possibilities of the potential use of photochromism of triarylmethane leucohydroxides and leucobisulfites , five leucohydroxides (see Table [5]) and five leucobisulfites were synthesized and two leucohydroxides and one leucobisulfite were investigated in a variety of solvents with different Brownstein Coefficients. Malachite green leucohydroxide and crystal violet leucohydroxide showed opposite behavior in the same basic solutions, while both of them were dramati cally affected by the change in solutions basicity. Photodegradation induced by repeated exposure (fatigue) manifested itself in the form of lower photo -induced optical density, with a constant halflife in malachite green leucohydroxide and in the form of longer halflife and constant optical density in crystal violet leucohydroxide. The three tested compounds were very sensitive to ambient oxygen and carbon dioxide