Non-classical donor–acceptor–donor chromophores. A strategy for high two-photon brightness
作者:Adina I. Ciuciu、Dikhi Firmansyah、Vincent Hugues、Mireille Blanchard-Desce、Daniel T. Gryko、Lucia Flamigni
DOI:10.1039/c4tc00234b
日期:——
Rod-like π-expanded bis-imidazo[1,2-a]pyridines were designed and synthesized. Strategic placement of a central electron-poor unit at position C3 of the imidazo[1,2-a]pyridine core resulted in donor–acceptor–donor quadrupolar systems. We further demonstrated the applicability of the Ortoleva–King–Chichibabin tandem process in the preparation of complex imidazo[1,2-a]pyridines. The monomer model heterocycles
设计并合成了棒状的π-扩展的双咪唑并[1,2- a ]吡啶。在咪唑并[1,2- a ]吡啶核的C3位置上中央电子贫乏单元的战略定位导致了供体-受体-供体四极体系。我们进一步证明了Ortoleva–King–Chichibabin串联工艺在制备复杂的咪唑并[1,2- a ]吡啶中的适用性。单体模型杂环因在C2和C3处的取代而不同,显示出的发光特性略微取决于取代模式和共轭延伸。最高的发光量子产率(φ FL约模型化合物显示0.2)在C3处没有取代,而其他化合物的测量值较低。对于四极体系,甲苯的量子产率在ϕ fl = 0.7至ϕ fl > 0.9的范围内变化。除了双-咪唑并[1,2一]吡啶具有两个甲基基团,具有φ FL在甲苯= 0.69和0.35在二氯甲烷中,发光性能只略微通过在溶剂中的变化的影响。大多数荧光寿命为1-2 ns,辐射速率常数达到ca的值。6×10 8 s -1。强度为77 K的强磷