Abstract
A number of new triarylmethane and styryl dyes with 1,1-dihydropolyfluoroalkyl groups at the nitrogen atoms have been prepared. We have studied the influence of polyfluoroalkyl groups on the colour of these triarylmethane and styryl dyes. The accumulation of N-polyfluoroalkyl radicals in the molecule of triarylmethane dyes exerts a hypsochromic shift of absorption maxima. The styryl dyes absorb at shorter wavelengths than the styryl dyes with dimethylamino groups. These demonstrate the lessening of the basicity of the nitrogen atom, bonded with the 1,1-dihydropolyfluoroalkyl radicals. Nevertheless, RNCH 2(CF 2CF 2) n H groups show themselves in the triphenylmethane and styryl dyes as sufficiently strong auxochromes.
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