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α-naphtholphthalein
Sign in to saveα-Naphtholphthalein (C28H18O4) is a phthalein dye used as a pH indicator with a visual transition from colorless/reddish to greenish blue at pH 7.3–8.7.
Chemical data
- Formula
- C28H18O4
- Molecular weight
- 418.4 g/mol
- IUPAC name
- 3,3-bis(4-hydroxynaphthalen-1-yl)-2-benzofuran-1-one
- SMILES
- C1=CC=C2C(=C1)C(=CC=C2O)C3(C4=CC=CC=C4C(=O)O3)C5=CC=C(C6=CC=CC=C65)O
- InChIKey
- HQHBAGKIEAOSNM-UHFFFAOYSA-N
- XLogP
- 6.3
- Polar surface area
- 66.8 Ų
- H-bond donors
- 2
- H-bond acceptors
- 4
- Formal charge
- 0
via PubChem
Wikidata facts
- Subclass of
- chemical compound
- Mass
- 418.121
Show 4 more facts
- Commons category
- 1-Naphtholphthalein
- chemical formula
- C₂₈H₁₈O₄
- canonical SMILES
- C1=CC=C2C(=C1)C(=CC=C2O)C3(C4=CC=CC=C4C(=O)O3)C5=CC=C(C6=CC=CC=C65)O
- melting point
- 239.0
Sources (2)
via Wikidata · CC0
~1 min read
Encyclopedic overview
1 sectionsContents
- References
α-Naphtholphthalein (C28H18O4) is a phthalein dye used as a pH indicator with a visual transition from colorless/reddish to greenish blue at pH 7.3–8.7.
==References==
Excerpted from Wikipedia’s “α-naphtholphthalein” article, available under the CC BY-SA 4.0 licence.