2,5-Diphenyloxazole

changed changed 447082693 PPO_chem.png 200px 2,5-Diphenyl-1,3-oxazole PPO, DPO, POP correct CAS 92-71-7 correct FDA 2P8A647RYF 7105 202-181-3 correct chemspider 6838 1S/C15H11NO/c1-3-7-12(8-4-1)14-11-16-15(17-14)13-9-5-2-6-10-13/h1-11H CNRNYORZJGVOSY-UHFFFAOYSA-N C1=CC=C(C=C1)C2=CN=C(O2)C3=CC=CC=C3 15 11 1 1 greenish powder 1.094 g/cm3 (100 °C) 1.6231 (100 °C) 71 Haynes, William M. 2016 CRC Handbook of Chemistry and Physics 97th CRC Press 9781498754293 3.232 360 07 Warning 302 319 413 264 264+265 270 273 280 301+317 305+351+338 330 337+317 501 2,5-Diphenyloxazole (PPO) is an organic scintillator. 10.1002/chem.201404093 25335882 Current Status on Plastic Scintillators Modifications Chemistry - A European Journal 20 48 15660–15685 2014 Bertrand Guillaume H. V. Hamel Matthieu Sguerra Fabien 2014ChEuJ..2015660B https://cea.hal.science/cea-01827633 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. References Category:Oxazoles