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In this study we have shown that water soluble fluorescent squaraine dyes can be produced as organic salts in combination with a range of organic cations although some cations, it was found, limit solubility. Chemical analysis of twenty-four such squaraine salts showed that only one existed in the solid-state as the pure organic salt, all others existed as hydrates with varying amounts of crystalline...
Here we report that the difficulties encountered in the synthesis of a dual-pendant sulfonate bis(indolenine)squaraine dye can be overcome through the use of equimolar amounts of the common reaction catalyst, thus creating an organic salt between the sulfonate groups and the protonated catalyst. Thus, a range of water-soluble dyes can further be prepared, by simply altering the catalyst. Crystal structures...
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