https://scholars.lib.ntu.edu.tw/handle/123456789/626307
標題: | Mono-Heteroatom Substitution for Harnessing Excited-State Structural Planarization of Dihydrodibenzo[a,c]phenazines | 作者: | Chen Y Chen D.-G Chen Y.-A Wu C.-H Chang K.-H Meng F.-Y Chen M.-C Lin J.-A Huang C.-Y Su J Tian H PI-TAI CHOU |
關鍵字: | fluorescence; heterocycles; photoinduced planarization; sensors; substituent effects | 公開日期: | 2019 | 卷: | 25 | 期: | 72 | 起(迄)頁: | 16755-16764 | 來源出版物: | Chemistry - A European Journal | 摘要: | With the aim of generalizing the structure–properties relationship of bending heterocyclic molecules that undergo prominent photoinduced structural planarization (PISP), a series of new dihydrodibenzo[ac]phenazine derivatives in which one nitrogen atom is replaced by oxygen (PNO), sulfur (PNS), selenium (PNSe), or dimethylmethanediyl (PNC) was strategically designed and synthesized. Compounds PNO, PNS, and PNSe have significantly nonplanar geometries in the ground state, which undergo PISP to give a planarlike conformer and hence a large emission Stokes shift. A combination of femtosecond early relaxation dynamics and computational approaches established an R*→I* (intermediate)→P* sequential kinetic pattern for PNS and PNSe, whereas PNO undergoes R*→P* one-step kinetics. The polarization ability of the substituted heteroatoms, which is in the order O |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076089813&doi=10.1002%2fchem.201904900&partnerID=40&md5=dc31a335a225d79907bbedc64296a7b7 https://scholars.lib.ntu.edu.tw/handle/123456789/626307 |
ISSN: | 09476539 | DOI: | 10.1002/chem.201904900 | SDG/關鍵字: | Excited states; Fluorescence; Ground state; Sensors; Synthesis (chemical); Computational approach; Heteroatom substitution; Heterocycles; Heterocyclic molecules; Lone pair electrons; Planarization; Relaxation dynamics; Substituent effect; Selenium compounds |
顯示於: | 化學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。