SYNTHESIS, ABSORPTION-SPECTRA, AND PHOTOSTABILITY OF TRIARYLMETHANE DYE ETHYNYLOGUES CONTAINING TRIFLUOROMETHYL GROUP(S)

Triarylmethane dye ethynylogues 7'-11' containing trifluoromethyl grou p(s) are synthesized in moderate to good yields by treating 1,1,3-tria ryl-2-propyn-1-ols, prepared from diaryl ketones and lithium arylacety lides bearing trifluoromethyl group(s), with perchloric acid. The firs t absorption bands of a series of triarylmethane dye ethynylogues cont aining trifluoromethyl group(s) 11' are observed around 700 nm. The ph otostability of the triarylmethane dyes is also examined.