Composite nanofibers doped with a phosphorescent Re(I) complex having restricted conjugation plane in its diamine ligand: Preparation, characterization, photophysical property and oxygen-sensing performance
摘要:
In this paper, we report a Re(I) complex of Re(CO)(3)(Cl-PYO)Br, where Cl-PYO stands for 2-(4-chlorophenyl)-5-(pyridin-2-yl)-1,3,4-oxadiazole, including its synthesis, identification, molecular structure, theoretical calculation and photophysical character. Re(CO)(3)(Cl-PYO)Br is found to be a yellow emitter with long excited state lifetime in pure N-2 atmosphere. Theoretical calculation result suggests that this emission comes from a triplet metal-to-ligand-charge-transfer excited state. By doping Re(CO)(3)(Cl-PYO)Br into a polymer supporting matrix of poly(vinylpyrrolidone), the emission of the resulted composite materials is found to be sensitive towards various oxygen concentrations. The maximum sensitivity is obtained to be 7.88. Owing to the porous structure of fibrous poly(vinylpyrrolidone) matrix, a short response time of 11 s towards molecular oxygen is also realized with high photostability. (C) 2013 Elsevier B.V. All rights reserved.
Iodine-promoted one-pot synthesis of 1,3,4-oxadiazole scaffolds <i>via</i> sp<sup>3</sup> C–H functionalization of azaarenes
作者:Geeta Sai Mani、Kavitha Donthiboina、Nagula Shankaraiah、Ahmed Kamal
DOI:10.1039/c9nj03573g
日期:——
for the synthesis of 2,5-disubstituted 1,3,4-oxadiazole scaffolds has been developed via sp3 C–H functionalization. Gratifyingly, this method involves oxidative amination with concomitant base-mediated cyclization of methylhetarenes and acylhydrazines by employing iodine and Cs2CO3. The key features of the present method include good functional group tolerance, a clean protocol, metal-free conditions
通过sp 3 C–H官能化开发了一种有效的碘介导的一锅合成方案,用于合成2,5-二取代的1,3,4-恶二唑支架。令人欣慰的是,该方法涉及通过使用碘和Cs 2 CO 3进行氧化胺化反应,并伴随碱介导的甲基戊烯和酰基肼的环化反应。本方法的关键特征包括良好的官能团耐受性,清洁的方案,无金属的条件和高收率,使得该方案成为合成生物活性分子及其关键构件的有吸引力的策略。
Palladium catalyzed direct C–H arylation of 1,3,4-oxadiazole using ligand combination approach
作者:Sneha Prasad Bakare、Mahendra Patil
DOI:10.1016/j.tet.2024.133885
日期:2024.4
The use of combination of readily available ligands in palladiumcatalyzedC–Harylation of 1,3,4-oxadiazole with iodoarenes as well as bromoarenes is reported. The combination of phenanthroline monohydrate (Phen.HO) and triphenyl phosphine (PPh) with Pd catalyst exhibited improved catalytical activity compared to a single ligandused separately in the reaction. A wide range of 2,5-diarylated-1,3,4-oxadiazoles