Development of Imidazo[1,2-<i>a</i>]pyridine Derivatives with an Intramolecular Hydrogen-Bonded Seven-Membered Ring Exhibiting Bright ESIPT Luminescence in the Solid State
作者:Toshiki Mutai、Tatsuya Muramatsu、Isao Yoshikawa、Hirohiko Houjou、Masaru Ogura
DOI:10.1021/acs.orglett.9b00455
日期:2019.4.5
Imidazo[1,2-a]pyridine derivatives with different hydroxyaryl units (1–3), which could potentially form an intramolecular hydrogen-bonded seven-membered ring in either a planar or a twisted conformation, were newly developed, and the effect of conformation and steric repulsion on the excited-state intramolecular proton transfer (ESIPT) luminescence was evaluated. Among them, 1 and 2 formed an intramolecular
咪唑并[1,2一]具有不同羟基芳基单元(吡啶衍生物1 - 3),这有可能形成在任何一个平面的或扭曲的构象的分子内氢键键合的7元环,被新开发的,及效果构象和空间排斥对激发态分子内质子转移(ESIPT)发光的评价。其中1和2在结晶状态下形成分子内氢键合的七元环,并且在固态下表现出有效的ESIPT发光(量子产率高达0.45)。