The first examples of triphenylmethane dye ethynologues (i.e, p-dimethylaminophenylethynylxanthenylium, thioxanthenylium, and selenoxanthenylium perchlorates) absorbing in the near i.r. (up to 802 nm in CH2Cl2) have been synthesized by treatment of the corresponding alcohols with acids.
S. Akiyama, S. Nakatsuji, K. Nakashima and M. Watanabe, J. Chem. Soc., Chem. Commun., 1987, 710 DOI: 10.1039/C39870000710
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