Murakami, Yoichi; Motooka, Ayumu; Enomoto, Riku; Niimi, Kazuki; Kaiho, Atsushi; Kiyoyanagi, Noriko published an article about the compound: 2,5-Diphenyloxazole( cas:92-71-7,SMILESS:C1(C2=CC=CC=C2)=NC=C(C3=CC=CC=C3)O1 ).Related Products of 92-71-7. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:92-71-7) through the article.
In this article, visible-to-UV photon upconversion (UV-UC) by triplet-triplet annihilation in the emission range shorter than 340 nm, which is previously unexplored, is presented and the relevant physicochem. characteristics are elucidated. Investigations were carried out in several deaerated solvents using acridone and naphthalene derivatives as a sensitizer and emitter, resp. Both upconversion quantum efficiency and sample photostability under continuous photoirradiation strongly depended on the solvent. The former dependence is governed by the solvent polarity, which affects the triplet energy level matching between the sensitizer and emitter because of the solvatochromism of the sensitizer. To elucidate the latter, first we investigated the photodegradation of samples without the emitter, which revealed that the sensitizer degradation rate is correlated with the difference between the frontier orbital energy levels of the sensitizer and solvent. Inclusion of the emitter effectively suppressed the degradation of the sensitizer, which is ascribed to fast quenching of the triplet sensitizer by the emitter and justifies the use of ketonic sensitizers for UV-UC in solvents. A theor. model was developed to acquire insight into the observed temporal decays of the upconverted emission intensity under continuous photoirradiation The theor. curves generated by this model fitted the exptl. decay curves well, which allowed the reaction rate between the emitter and solvent to be obtained.
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Reference:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica