In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Visible-to-UV triplet-triplet annihilation upconversion from a thermally activated delayed fluorescence/pyrene pair in an air-saturated solution, published in 2019-11-30, which mentions a compound: 92-71-7, mainly applied to thermally activated delayed fluorescence pyrene triplet annihilation upconversion, Application In Synthesis of 2,5-Diphenyloxazole.
Despite increasing use of triplet-triplet annihilation upconversion (TTA-UC) of low-energy visible light, the generation of UV photons by TTA remains challenging because of the difficulty in finding sensitizers and acceptors with suitable energy levels. Here, we report efficient, photostable visible-to-UV TTA-UC in an air-saturated solution using a new pair with suitable energy levels: a thermally activated delayed fluorescence (TADF) mol. and pyrene. 4CzIPN, which has extremely small energy difference ΔEST (0.083 eV), was used as the TADF sensitizer to promote effective triplet energy transfer to the acceptor. When oleic acid was used as an effective singlet oxygen receptor in an air-saturated solution, the 4CzIPN/pyrene pair exhibited bright upconverted emission at 370-430 nm under 445 nm laser excitation, but no noticeable upconverted emission was observed when 4CzIPN was paired with previously reported UV-emitting acceptors [2,5-diphenyloxazole (PPO), p-terphenyl, and p-quaterphenyl]. TTA was confirmed by the quadratic dependence of the upconverted emission intensity on the 445 nm laser power d. The maximum quantum yield of the upconverted emission from the 4CzIPN/pyrene pair was 0.66%, which is considerable when compared with that of a previously reported visible-to-UV TTA-UC system with a biacetyl/PPO pair (0.58%).
This literature about this compound(92-71-7)Application In Synthesis of 2,5-Diphenyloxazolehas given us a lot of inspiration, and I hope that the research on this compound(2,5-Diphenyloxazole) can be further advanced. Maybe we can get more compounds in a similar way.
Reference:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica