Amphipolar, Amphiphilic 2,4-diarylpyrano[2,3-<i>b</i>]indoles as Turn-ON Luminophores in Acidic and Basic Media.

While biologically important buffers [ 66 , 67 ] like HEPES (2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid) or MOPS (3-morpholinopropane-1-sulfonic acid) did not facilitate the water solubility of dye 5 , a clear trend can be identified for aqueous systems at different pH values ( Table 2 ).

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