Thymolphthalein Explained

Thymolphthalein is a phthalein dye used as an acid–base (pH) indicator. Its transition range is around pH 9.3–10.5. Below this pH, it is colorless; above, it is blue. The molar extinction coefficient for the blue thymolphthalein dianion is 38,000 M−1 cm−1 at 595 nm.[1]

Thymolphthalein is also known to have use as a laxative[2] and for disappearing ink.[3]

Preparation

Thymolphthalein can be synthesized from thymol and phthalic anhydride.

See also

Notes and References

  1. Hahn HH . Cheuk SF . Elfenbein S . Wood WB . Studies on the Pathogenesis of Fever: Xix. Localization of Pyrogen in Granulocytes. The Journal of Experimental Medicine. 131 . 4 . 701–9 . April 1970 . 5430784 . 2138774 . 10.1084/jem.131.4.701.
  2. Hubacher . MH . Doernberg . S . Horner . A . 1953 . Laxatives: chemical structure and potency of phthaleins and hydroxyanthraquinones . Journal of the American Pharmaceutical Association . 42 . 1. 23–30 . 13034620 . 10.1002/jps.3030420108 .
  3. Web site: Disappearing Ink. Katz. David A.. 1982. www.chymist.com. August 14, 2017.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Thymolphthalein".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.