Names | |
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Preferred IUPAC name
9H-Cyclopenta[1,2-b:4,3-b′]dipyridin-9-one | |
Other names
DFO
9H-1,8-Diazafluoren-9-one 9H-Pyrido[3′,2′:3,4]cyclopenta[1,2-b]pyridin-9-one | |
Identifiers | |
3D model (JSmol)
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ChemSpider | |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C11H6N2O | |
Molar mass | 182.182 g·mol−1 |
Appearance | Yellow powder |
Melting point | 229–233 °C (444–451 °F; 502–506 K) |
Hazards | |
GHS labelling: | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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1,8-Diazafluoren-9-one (DFO) is an aromatic ketone first synthesized in 1950. It is used to find fingerprints on porous surfaces.[1][2] It makes fingerprints glow when they are lit by blue-green light.[2]
DFO reacts with amino acids present in the fingerprint to form highly fluorescent derivatives. Excitation with light at ~470 nm results in emission at ~570 nm.[2]