Dimerization Reactions in Sunlight. IV.1 Photodimerization of Thianaphthene-1,1-dioxide and its Substituted Derivatives and of 3-Benzylidene-6,7-benzophthalide
of N,α-diphenyl nitrone have been investigated in the 2- or 3-substituted (methyl, phenyl, chloro, bromo, piperidino, acetyl) benzo[b]thiopheneS-oxide and SS-dioxide series. The S-oxide and SS-dioxide derivatives show the same ability to form adducts. The 2,3-dihydrobenzo[b]-thieno[2,3-d]isoxazolidines are generally formed only as a single regioisomer, except in the case of 2-methyl dipolarophiles
已经研究了N,α-二苯基硝酮的1,3-偶极环加成反应是在2-或3-取代的(甲基,苯基,氯,溴,哌啶子基,乙酰基)苯并[ b ]噻吩S-氧化物和SS-二氧化物系列中进行的。 。该小号氧化物和SS二氧化物衍生物显示出,以形成加合物的能力相同。2,3-二氢苯并[ b ]-噻吩[2,3- d]异恶唑烷通常仅以单一的区域异构体形式形成,除了2-甲基双极性亲和剂形成两个区域异构体的情况以外。在CNDO / S计算和光电光谱电离势的基础上,根据边界轨道相互作用来讨论区域选择性。具有肘形形状的硝酮可能导致非对映异构体的形成,但实际上仅形成了反式-异恶唑烷。S-氧化物系列中的立体选择性较低,因为我们仅与3-甲基双极性亲和剂获得一种加合物,但与3-苯基衍生物同时获得了顺式和反式表位。溴衍生物不导致任何加合物。X给出了两种加合物的-射线结构,其对应于将硝基添加至苯并[ b ]噻吩SS-二氧化物和2-甲基衍生物。
Photomechanical Luminescence from Through‐Space Conjugated AIEgens
fluorescence enhancement are observed for P-BTO crystals under UV light, which is attributed to the formation of photodimer 2P-BTO. Although 2P-BTO is poorly π-conjugated because of the central cyclobutanering, it exhibits prominent through-space conjugation and aggregation-induced emission (AIE), affording strong solid-state blue fluorescence at 415 nm with an excellent quantum yield of up to 96.2 %
switching in molecular aggregates by the topological [2+2] photocycloaddition of thianaphthene-dioxide derivatives promises a way to regulate molecular stacking and alter photophysical processes. It was demonstrated that such a photocycloaddition can occur when derivatives are doped in selective polymer matrixes, which paves the way for the visualization of macrophase separation in polymerblends.
Efficient photoactivation behavior of bright solid-state fluorescence of a variety of benzo[b]thiophene 1,1-dioxide derivatives luminogens is achieved based on a controllable self-assembly and efficient intermolecular [2+2] photodimerization reaction, which provides a simple and effective pathway to construct smart photoresponsive materials and fresh AIEgens with excellent photostability in purely
基于可控的自组装和高效的分子间[2+2]光二聚反应,实现了多种苯并[ b ]噻吩1,1-二氧化物衍生物发光体的明亮固态荧光的高效光活化行为,提供了一种简单且高效的光活化行为。在纯空间共轭中构建具有优异光稳定性的智能光响应材料和新鲜 AIEgen 的有效途径。