Chemical structure of phenolphthalein, a common phthalein dye
Phthalein dyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH.[1] They are formed by the reaction of phthalic anhydride with various phenols. They are a subclass of triarylmethane dyes.
Common phthalein dyes include:
Bromothymol blue
Bromocresol green
Bromocresol purple
Cresol Red
o-Cresolphthalein
Chlorophenol red
Dixylenolphthalein
Guaiacolphthalein
α-Naphtholphthalein
Phenolphthalein
Phenolsulfonphthalein
Tetrabromophenolphthalein
Thymol blue
Thymolphthalein
Xylenolphthalein
^Sabnis, Ram W. (2010). "Phthalein Dyes". Kirk-Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.phthsabn.a01. ISBN 978-0471238966.
Phthaleindyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH. They are formed by the reaction...
dominant use as dyes, many of these dyes react reversibly with acid and base, and thus serve as pH indicators. Zelyonka attack Phthaleindye Wikimedia Commons...
Thymolphthalein is a phthaleindye used as an acid–base (pH) indicator. Its transition range is around pH 9.3–10.5. Below this pH, it is colorless; above...
solutions and pink in basic solutions. It belongs to the class of dyes known as phthaleindyes. Phenolphthalein is slightly soluble in water and usually is...
bromosulfophthalein, and BSP) is a phthaleindye used in liver function tests. Determining the rate of removal of the dye from the blood stream gives a measure...
α-Naphtholphthalein (C28H18O4) is a phthaleindye used as a pH indicator with a visual transition from colorless/reddish to greenish blue at pH 7.3–8...
include the synthesis and description of the plant dye indigo, the discovery of the phthaleindyes, and the investigation of polyacetylenes, oxonium salts...
Bromothymol blue (also known as bromothymol sulfone phthalein and BTB) is a pH indicator. It is mostly used in applications that require measuring substances...
console. Adolf von Baeyer: Chemist. Synthesized indigo, discovered the phthaleindyes, and investigated polyacetylenes, oxonium salts, nitroso compounds (1869)...
yellowish-green fluorescence. The rhodamines, which are closely related to the phthaleins, are formed by the condensation of the alkyl metaaminophenols with phthalic...
(1835–1917) Chemist ~around 1852–1858 Synthesized indigo; discovered the phthaleindyes; proposed the correct formula for indole; introduced the strain theory...
Beilstein 5-19-03-00457 Tamura, Z.; Maeda M. (1997). "Differences between phthaleins and sulfonphthaleins". Yakugaku Zasshi (in Japanese). 117 (10–11): 764–770...
with John J. Abel, a prominent pharmacologist. Abel introduced him to phthalein, from which he and J. T. Geraghty developed the Rowntree test of renal...
earned his doctorate in 1874 under Adolf von Baeyer with his study of phthaleins. Fischer remained with Baeyer in Strassburg as an independent research...
Brønsted-Lowry acid-base functionality have been developed such azo dyes, nitrophenols, phthaleins, and sulfonphthaleins. The Brønsted-Lowry acid-base functionality...
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