2-(1-Naphthyl)-5-phenyloxazole [for scintillation spectrometry] TCI N0068

Chemical Identity

CAS No.: 846-63-9
PubChem: CID 11196533·SID 87573464
Formula: C19H13NO
Molecular weight: 271.3 g/mol
Purity: >99.0%(HPLC)(N)

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 5-naphthalen-1-yl-2-phenyl-1,3-oxazole
SMILES: C1=CC=C(C=C1)C2=NC=C(O2)C3=CC=CC4=CC=CC=C43
InChIKey: HRQYHEPZYHRWGN-UHFFFAOYSA-N

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TCI N0068, 2-(1-Naphthyl)-5-phenyloxazole — known among researchers more familiarly as α-NPO — is an aromatic oxazole compound formulated specifically for scintillation spectrometry. The material functions as a secondary scintillator, or wavelength shifter, within liquid scintillation cocktails: the component that captures energy from the primary scintillator and re-emits it at a wavelength better matched to the sensitivity of the photomultiplier tube. Its role is particularly important in low-level radioactivity measurements such as tritium and carbon-14 isotope counting, where every photon reaching the detector contributes to a usable count.

The properties that make this compound the preferred choice are its high energy transfer efficiency together with the shift of emission toward longer wavelengths compared with conventional primary scintillators. The oxazole structure conjugated with naphthyl and phenyl rings produces a delocalised electron system that supports strong fluorescence with good quantum yield. The dedicated grade for scintillation spectrometry means the material has been controlled against impurities capable of causing quenching, so that the counting response remains linear and stable across a measurement series rather than drifting as the cocktail ages.

In Indonesian laboratories, the compound is presented as a crystalline solid that dissolves readily in aromatic solvents, making it convenient to prepare into cocktail formulations in-house. It is typically found in radiochemistry and radiotracer facilities, nuclear research institutions, university analytical chemistry laboratories, and environmental and biomedical groups that rely on liquid scintillation counting for low-activity samples where commercial pre-mixed cocktails do not meet the specific requirements of the method.

Related TCI products

Liquid scintillation cocktail formulation — serves as the secondary scintillator that shifts primary emission into the spectral region where photomultiplier tubes respond most efficiently, raising overall counting yield.
Tritium counting — supports low-level radioactivity measurement of the weak beta emitter, where improved wavelength matching materially increases the fraction of decay events that are actually registered.
Carbon-14 measurement — assists radiocarbon-labelled sample counting by maximising light output per decay event, which is decisive when sample activity is close to the instrument background.
Radiotracer studies in biochemistry — enables detection of labelled metabolites and reaction products in research work where isotope quantities are deliberately kept small to limit radiological exposure.
Environmental radioactivity monitoring — suits analysis of water and environmental samples with low isotope content, since the scintillation-grade control against quenching impurities keeps the counting response linear and reproducible.

Brand	TCI (Tokyo Chemical Industry)
CAS number	846-63-9
Molecular formula	—
Purity	—
Category	Analytical Chemistry > Analytical Reagents > Scintillators
Pack sizes	available in standard TCI catalogue pack sizes; please confirm the pack size when ordering
Physical form	crystalline solid, readily soluble in aromatic solvents
Storage	keep in a tightly closed original container, protected from light

Grade: special grade for scintillation spectrometry, controlled against quenching impurities

Store the material in its tightly closed original container in a cool, dry place, protected from light and away from oxidising agents, since prolonged light exposure may affect the fluorescence performance of the compound. Amber glass or the supplied original packaging is suitable; avoid transferring into containers that may introduce impurities capable of causing quenching. Handle the solid in a well-ventilated area or fume hood, using gloves, safety glasses, and a laboratory coat, and avoid generating or inhaling dust. When preparing cocktail solutions, work with aromatic solvents only under adequate ventilation and observe the relevant solvent precautions. Consult the manufacturer's safety data sheet before first use, and dispose of residues in accordance with applicable laboratory waste procedures.

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