Alizarin blue

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Description

Alizarine blue crystallizes in brownish-violet needles from a benzene solution. When prepared in a saturated alcoholic solution, alizarin blue is used as an acid-base indicator. It changes from pink at pH 0.0 to yellow at pH 2.6. It also changes from yellow at pH 6.0 to green at pH 7.6.

See also [[alizarin|alizarin]].

Synonyms and Related Terms

5,6-dihydroxynaphtho[2,3-f]-quinoline-7,12-dione; 7,8-dihydroxy-5,6-phthaloquinoline; CI 67410; bleu d'alizarine (Fr.); blu d' alizarina (It.); azul de alizarina (Port.); Alizarine Blue R;

Physical and Chemical Properties

Soluble in glacial acetic acid, amyl alcohol and hot benzene. Slightly soluble in ethanol, ether and cold benzene. Insoluble in water.

Composition C17H9NO4
Melting Point 268-270 C
Molecular Weight 291.25

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 234