Synthesis and Structure‐Photophysics Evaluation of 2‐
<i>N</i>
‐Amino‐quinazolines: Small Molecule Fluorophores for Solution and Solid State
作者:Miho Motoyama、Thu‐Hong Doan、Paulina Hibner‐Kulicka、Ryo Otake、Malgorzata Lukarska、Jean‐Francois Lohier、Kota Ozawa、Shinkoh Nanbu、Carole Alayrac、Yumiko Suzuki、Bernhard Witulski
DOI:10.1002/asia.202100534
日期:2021.8.2
2-N-aminoquinazolines show a positive solvatochromism and are fluorescent in solution and in solid state with quantum yields up to 0.73. Increase in electron donor strength of the 2-amino substituent causes a red-shift of the intramolecular charge transfer (ICT) band (300–400 nm); whereas the photoluminescence emission maxima (350–450 nm) is also red-shifted significantly along with an enhancement in photoluminescence
2- N-氨基喹唑啉通过连续的S N Ar 官能化制备。X 射线结构显示 2- N-吗啉基团的氮孤对与缺电子喹唑啉核共轭,因此代表电子推挽系统。2- N-氨基喹唑啉显示正溶剂化显色性,在溶液和固态下均发荧光,量子产率高达 0.73。2-氨基取代基的电子供体强度增加导致分子内电荷转移(ICT)带(300-400 nm)红移;而光致发光发射最大值(350-450 nm)也随着光致发光效率的提高而显着红移。HOMO-LUMO 能量是通过电化学和光物理方法的组合估计的,并且与通过计算方法获得的能量相关。ICT 特性理论上归因于 SAC-CI 方法中对 Rydberg-MO 的激发,这可以解释为 n-π* 激发。7-Amino-2- N-morpholino-4-甲氧基喹唑啉对酸性条件有反应,光致发光强度显着增加,揭示了一种新的开启/关闭荧光探针。