FIELD: chemistry.
SUBSTANCE: invention relates to chemical industry, namely to a novel heterocyclic compound, which can be used as a colour or fluorescent indicator for visual detection of two transitions in the range of pH=2–1.7 and pH=1.7–1.5 in aqueous media and as a fluorescent indicator of the transition pH=1.7–1.5 in biological fluids. Invention compound is 5-[4'-(1",3",7"-trimethixant-2"-yl)phenyl] 10,15,20-tris-(N-methylpyridinium-3'-yl)porphyrin triiodide.
EFFECT: described is compound 5-[4'-(1",3",7"-trimethixant-2"-yl)phenyl] 10,15,20-tris-(N-methylpyridinium-3'-yl)porphyrin triiodide for use as a pH indicator of strongly acidic media.
1 cl, 3 dwg, 2 ex
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