Malachite Green leucocyanide

De Gaouck and LeFevre (25) also studied the conductivity of alcoholic solutions of Malachite Green leucocyanide and Brilliant Green leucocyanide. They found a definite reversibility for the conductance data with alternate irradiation and dark periods only after the first irradiation. Typical resistance for the photochromic dye systems are shown in Figure... 

Absorption and fluorescence spectra of 7-aminocoumarin derivatives have been recorded and the photophysics of coumarin inclusion complexes with 0- and y-cyclodextrins investigated. Solvent effects on the photophysical behaviour of pyrrolocoumarin derivatives are similar to those on the psorolens . Vibronic exciton bands and the absorption spectra of Eosin Y dimers have been analysed theoretically and compared with experimental data. Picosecond spectroscopic studies have been made on the ionic photodissociation dynamics of malachite green leucocyanide . The lowest state produces ions within 0.1 to 0.5 ns whilst for higher states 6-13 ps are sufficient for the development of charge separation. The photophysics of crystal violet in a series of n-... 

Cyanide ion is apparently not a very good leaving group because the only known examples of photoreactive substrates are those that yield intermediates of high stability like the triaiylmethane derivatives, malachite green leucocyanide, 18... 

Acetone is a convenient actinometer for vapor-phase studies of aldehydes and ketones, since Ico is 1.0 at temperatures above 120° and at wavelengtl from 2500-3200 A. In solution, the photolysis of uranyl oxalate is generally useful, and Malachite green leucocyanide is useful for low intensities of light. ... 

Photochromism of the thin gel films using Malachite Green Leucocyanide (MGLC) 18, having the largest s, as the former example and photochromism of super-fine particles of spiropyran 19 or spironaphthooxazine 20 in thin gel film, as the latter example, have been proposed (Scheme 28-2). 

A concentration cell has been described which is based upon the ionic photodissociation of the leucocyanides of the triphenylmethane dyes crystal violet or malachite green in acetonitrile or alcohol, as in reaction (4).28 This reaction is... 

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