Butyl PBD

Butyl PBD or b-PBD (short for butyl-phenyl-bipheny-oxydiazole^[1]) is a fluorescent organic compound used in the Liquid Scintillator Neutrino Detector (LSND) at Los Alamos National Laboratory, USA.^[1]

Butyl PBD

Names
Preferred IUPAC name 2-([1,1′-Biphenyl]-4-yl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole
Other names 2-(4-tert-Butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole 2-(4-Biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole
Identifiers
CAS Number	15082-28-7 Y
3D model (JSmol)	Interactive image
ChemSpider	76483 Y
ECHA InfoCard	100.035.563
EC Number	239-135-7
PubChem CID	84782
UNII	YKR9AP6LRZ Y
CompTox Dashboard (EPA)	DTXSID5065851
InChI InChI=1S/C24H22N2O/c1-24(2,3)21-15-13-20(14-16-21)23-26-25-22(27-23)19-11-9-18(10-12-19)17-7-5-4-6-8-17/h4-16H,1-3H3 Y Key: XZCJVWCMJYNSQO-UHFFFAOYSA-N Y InChI=1/C24H22N2O/c1-24(2,3)21-15-13-20(14-16-21)23-26-25-22(27-23)19-11-9-18(10-12-19)17-7-5-4-6-8-17/h4-16H,1-3H3 Key: XZCJVWCMJYNSQO-UHFFFAOYAT
SMILES CC(C)(C)c1ccc(cc1)c2nnc(o2)c3ccc(cc3)c4ccccc4
Properties
Chemical formula	C24H22N2O
Molar mass	354.44 g mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

The fluorescent emission of b-PBD is at λ_em = 364 nm for excitation at λ_ex = 305 nm (in ethanol solution).^[2] As a scintillant in the LSND, it was used at a concentration of 31 mg/L (87 μmol/L) dissolved in mineral oil.^[1]