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 and blood 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.