Mohamadpour Farzaneh, Amani Ali Mohammad
Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.
Front Chem. 2024 Aug 8;12:1407071. doi: 10.3389/fchem.2024.1407071. eCollection 2024.
Typically, organic dyes show lower excited state lifetimes, a key hindrance in the development of efficient photoredox processes. Due to their distinctive qualities and efficiency, a particular class of organic chromophores has drawn considerable interest from the scientific community. Thermally activated delayed fluorescence (TADF), is only seen in molecules with a minimal energy gap (usually less than 0.2 eV) between their lowest two excited states, i.e., singlet excited state (S) and triplet excited state (T), is a distinctive property of the molecules under study. Isophthalonitriles are a promising family of chromophores for use as organic photocatalysts because of the ease with which their redox potentials may be adjusted and the prolonged singlet excited states resulting from TADF.
A sustainable process for the photosynthesis of polyfunctionalized dihydro-2-oxypyrroles has been developed using the Michael-Mannich cyclocondensation of amines, dialkyl acetylenedicarboxylates, and formaldehyde. The development of a green radical synthesis strategy for this family of chemicals is discussed in detail in the current work. This work used a novel halogenated dicyanobenzene-based photosensitizer was used as a photocatalyst. It was dissolved in ethanol, exposed to air at ambient temperature, and triggered by a blue light-emitting diode as a renewable energy source. This project's main goal is to use a novel conveniently accessible, reasonably priced donor-acceptor (D-A) based on halogenated cyanoarene.
When exposed to visible light, the 3DPAFIPN [2,4,6-tris(diphenylamino)-5-fluoroisophthalonitrile] photocatalyst, which is a thermally activated delayed fluorescence (TADF), can induce single-electron transfer (SET), providing a simple and green method that is highly effective, energy-efficient, and environmentally friendly. Also, we calculated the turnover number (TON) and turnover frequency (TOF) for polyfunctionalized dihydro-2-oxypyrroles. Gram-scale cyclization has also been shown to be a practical technique for use in industrial applications.
通常情况下，有机染料的激发态寿命较短，这是高效光氧化还原过程发展的一个关键障碍。由于其独特的性质和效率，一类特殊的有机发色团引起了科学界的广泛关注。热活化延迟荧光（TADF）是所研究分子的一种独特性质，仅在其最低的两个激发态之间具有最小能隙（通常小于0.2电子伏特）的分子中出现，即单重激发态（S）和三重激发态（T）。间苯二甲腈是一类很有前景的用作有机光催化剂的发色团，因为其氧化还原电位易于调节，且热活化延迟荧光会导致单重激发态延长。
利用胺、二烷基乙炔二羧酸酯和甲醛的迈克尔 - 曼尼希环缩合反应，开发了一种用于多官能化二氢 - 2 - 氧代吡咯光合作用的可持续工艺。当前工作详细讨论了该类化学品绿色自由基合成策略的发展。这项工作使用了一种新型的基于卤代二氰基苯的光敏剂作为光催化剂。它溶解在乙醇中，在环境温度下暴露于空气中，并由蓝光发光二极管作为可再生能源触发。该项目的主要目标是使用一种基于卤代氰基芳烃的新型方便可得、价格合理的供体 - 受体（D - A）。
当暴露于可见光时，作为热活化延迟荧光（TADF）的3DPAFIPN [2,4,6 - 三（二苯胺基）-5 - 氟间苯二甲腈]光催化剂可诱导单电子转移（SET），提供了一种简单、绿色且高效、节能和环保的方法。此外，我们计算了多官能化二氢 - 2 - 氧代吡咯的周转数（TON）和周转频率（TOF）。克级环化也已被证明是一种适用于工业应用的实用技术。
