Names | |
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Preferred IUPAC name
2,2′,2′′,2′′′-[(3′,6′-Dihydroxy-3-oxo-3H-spiro[[2]benzofuran-1,9′-xanthene]-2′,7′-diyl)bis(methylenenitrilo)]tetraacetic acid | |
Other names
Fluorexon
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.014.507 |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C30H26N2O13 | |
Molar mass | 622.53 g/mol |
Melting point | Decomposes |
Boiling point | N/A |
Slightly soluble | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Calcein, also known as fluorexon, fluorescein complex, is a fluorescent dye with excitation and emission wavelengths of 495 and 515 nm, respectively, and has the appearance of orange crystals. Calcein self-quenches at concentrations above 70 mM and is commonly used as an indicator of lipid vesicle leakage.[1][2][3] It has also been traditionally used as a complexometric indicator for titration of calcium ions with EDTA, and for fluorometric determination of calcium.