Synthesis and Optical Properties of Fluorescent Core-Trisubstituted Naphthalene Diimide Dyes
作者:Frank Würthner、Cornelia Röger、Shahadat Ahmed
DOI:10.1055/s-2007-983718
日期:2007.6
Efficient synthetic routes to hitherto unknown core-trisubstituted naphthalene diimides (NDIs) starting with 2,6-dichloro-substituted NDIs 1 are described. The reaction of NDIs 1 with ethylene diamine as solvent, affords the ethylene-diamine-bridged core-trisubstituted NDIs 2 in very good yield. The substitution of the chlorine atom of 2 with alkylamino or alkoxy nucleophiles leads to triamino- or alkoxy-diamino-substituted NDIs. UV/Vis spectroscopy revealed that the electronic properties of NDI chromophores bearing three core substituents are strongly influenced by the nature of the substituents. NDIs which are tri(alkylamino)-substituted at the naphthalene core exhibit high (up to 70%) fluorescence quantum yields.
本文介绍了从 2,6-二氯取代的 NDIs 1 开始合成迄今未知的核-三取代萘二亚胺(NDIs)的高效合成路线。NDIs 1 以乙烯二胺为溶剂进行反应,可以得到乙烯二胺桥接的核-三取代 NDIs 2,收率非常高。用烷基氨基或烷氧基亲核物取代 2 的氯原子,可得到三氨基或烷氧基二氨基取代的 NDI。紫外/可见光谱显示,含有三个核心取代基的 NDI 发色团的电子特性受到取代基性质的强烈影响。在萘核上被三(烷基氨基)取代的 NDI 具有很高的荧光量子产率(高达 70%)。