2,5-Diphenyloxazole

2,5-Diphenyloxazole
Names
	Preferred IUPAC name 2,5-Diphenyl-1,3-oxazole
	Other names PPO, DPO, POP
Identifiers
CAS Number	92-71-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	6838 ;
ECHA InfoCard	100.001.984
EC Number	202-181-3;
PubChem CID	7105;
UNII	2P8A647RYF ;
CompTox Dashboard (EPA)	DTXSID7059060 ;
	InChI InChI=1S/C15H11NO/c1-3-7-12(8-4-1)14-11-16-15(17-14)13-9-5-2-6-10-13/h1-11H Key: CNRNYORZJGVOSY-UHFFFAOYSA-N;
	SMILES C1=CC=C(C=C1)C2=CN=C(O2)C3=CC=CC=C3;
Properties
Chemical formula	C15H11NO
Molar mass	221.259 g·mol−1
Appearance	greenish powder
Density	1.094 g/cm3 (100 °C)
Melting point	71 °C (160 °F; 344 K)
Boiling point	360 °C (680 °F; 633 K)
Refractive index (nD)	1.6231 (100 °C)
Hazards
	GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H302, H319, H413
Precautionary statements	P264, P264+P265, P270, P273, P280, P301+P317, P305+P351+P338, P330, P337+P317, P501
	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

2,5-Diphenyloxazole (PPO) is an organic scintillator. It is used as a wavelength shifter (also called a "primary shifter" or "fluor"), which means that it converts shorter wavelength light to longer wavelength light. Its output spectrum peaks at 385 nm, which is in the range of UV light.

PPO was used as the scintillator in the Borexino solar neutrino experiment, which led to precision spectroscopy of Solar neutrinos, as well as the discovery of geoneutrinos.