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3, 3-bis(4-hydroxynaphthalen-1-yl)-1, 3-dihydro-2-benzofuran-1-one
Practically insoluble in water; soluble in ethanol
a-Naphtholphthalein is used as a pH indicator and operates in the pH ranges between 7.3 and 8.7.
Optical carbon dioxide sensor based on the colorimetric change of pH indicator a-naphtholphthalein with the internal reference fluorescent CIS/ZnS qua.It is also used in the designing of optical carbon dioxide sensor based on fluorescence intensity.a-Naphtholphthalein has been described for use in the design of an optical CO2 sensor based on the fluorescence intensity changes of Tetraphenylporphyrin (sc-215304) due to absorption changes of alpha-Naphtholphthalein embedded in a polymer.