1,8-Diazafluoren-9-one

1,8-Diazafluoren-9-one
Names
	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
CAS Number	54078-29-4 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	633891 ;
PubChem CID	725961;
UNII	V3B9KD3X5K ;
CompTox Dashboard (EPA)	DTXSID10352406 ;
	InChI InChI=1S/C11H6N2O/c14-11-9-7(3-1-5-12-9)8-4-2-6-13-10(8)11/h1-6H Key: FOSUVSBKUIWVKI-UHFFFAOYSA-N ; InChI=1/C11H6N2O/c14-11-9-7(3-1-5-12-9)8-4-2-6-13-10(8)11/h1-6H Key: FOSUVSBKUIWVKI-UHFFFAOYAH;
	SMILES O=C1C3=C(C=CC=N3)C2=C1N=CC=C2; O=C3c1ncccc1c2c3nccc2;
Properties
Chemical formula	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:
Pictograms
NFPA 704 (fire diamond)	2 1 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

1,8-Diazafluoren-9-one (DFO) is an aromatic ketone first synthesized in 1950. It is used to find fingerprints on porous surfaces. It makes fingerprints glow when they are lit by blue-green light.

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.

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