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The interaction of quinones with ground and electronically excited states of xanthene dyes was investigated. Ground state xanthene derivatives form aggregates with quinones. Apparent association constants range from 20 to 1500 M −1 , depending on the particular xanthene derivative-quinone...
The study presents the photophysical characteristics in ethanol and benzene of four fluorescent 1,8-naphthalimides dyes containing polymerizing groups bound to imide nitrogen atom as well as an amino group in 4-position to naphthalene ring. The polymerization of styrene or methylmethacrylate in...
Photochromic spiropyrans have attracted much current attention because of their potential applications including optical memories and light-controlling media. The colored form of the compound, however, is thermally unstable and bleached. Numerous potential metal complexes were synthesized to...
The influence of mixed coupling on the properties of C.I. Pigment Yellow 12 is studied. Carboxy and sulfo derivatives of acetoacetanilide were used as the second modifying coupling components. The results showed that the state of the crystal and particle size changed; the pigment flowability and...
Compound 5-(8,8-dicyanoheptafulven-3-yl)-2-hydroxy-1,3-xylyl-18-crown-5 is a novel non-benzenoid crown ether dye derived from 8,8-dicyanoheptafulvene together with a crown ether having a phenolic hydroxide group in its cavity. The color change on deprotonation has been UV/Vis-spectroscopically...
Two series of 3-sulfopropyl styryl cyanine dyes were synthesized by condensation of (un) substituted benzothiazole betaine with a view to studying their spectral characterization and silver halide photosensitization properties. The structures of the dyes evaluated by elemental analysis, 1 H NMR,...
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