Hydrochloric Acid → HCID 88636013, compound

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Reaction Steps

14.5 g Sodium hydroxide and 9.0 g water are heated to ca. 130° C. and 8.53 g 1-decyloxypyrene-3,6,8-trisulfonate (structure IV, R=decyl, M=Na) are added to the melt in small portions under stirring. The temperature is raised within 30 min to 190° C. The mixture is cooled, cautiously acidified with concentrated hydrochloric acid, and the resulting precipitate is filtered and recrystallized from a saturated aqueous salt solution. For further purification it is recrystallized from aqueous ethanol. Yield is 2.6 g of yellow crystals that decompose at above 232° C. and which have a green fluorescence that is strongly pH-dependent in the pH 6-8 range.

Provenance & Evidence