The preparation of some new thiophene and thianaphthene dyes and their derivatives has been presented and discussed. The absorption spectra of 3-Thianaphthene Malachite Green, 2-Thianaphthene Malachite Green and its derivatives, 3-Thiophene Malachite Green and its derivatives have been determined and compared with the absorption spectra of Malachite Green. An interpretation of the bathochromic effects of the thiophene and thianaphthene rings in triarylmethane dyes has been offered.
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