Highly Emissive Luminogens Based on Imidazo[1,2-<i>a</i>]pyridine for Electroluminescent Applications
作者:Natarajan Nagarajan、Gunasekaran Velmurugan、Asit Prakash、Nanda Shakti、Monica Katiyar、Ponnambalam Venuvanalingam、Rajalingam Renganathan
DOI:10.1002/asia.201301061
日期:2014.1
A search for novel organic luminogens led us to design and synthesize some N‐fused imidazole derivatives based on imidazo[1,2‐a]pyridine as the core and arylamine and imidazole as the peripheral groups. The fluorophores were synthesized through a multicomponent cascade reaction (A3 coupling) of a heterocyclic azine with an aldehyde and alkyne, followed by Suzuki coupling and a multicomponent cyclization
对新型有机发光剂的探索促使我们设计和合成了一些以咪唑并[1,2- a ]吡啶为核心,芳基胺和咪唑为外围基团的N稠合咪唑衍生物。荧光团是通过杂环嗪与醛和炔烃的多组分级联反应(A 3偶联),随后的Suzuki偶联和多组分环化反应合成的。所有化合物都表现出有趣的光物理响应,尤其是含芳基胺的衍生物,由于有效的电荷从供体芳基胺迁移到咪唑[1,2- a],因此在发射光谱中表现出强烈的正溶剂溶变色,表明极性更强的激发态。]吡啶受体。量子产率在0.2到0.7范围内,并且取决于取代模式,最明显的是基于C2位置的供体基团。此外,使用四参数Catalán和Kamlet-Taft溶剂标度,讨论了一般溶剂和特定溶剂对荧光团光物理性质的影响。通过循环伏安法,热重分析和AFM方法探索了化合物的出色的热,电化学和形态稳定性。此外,为了了解分子的结构,键和带隙,进行了DFT计算。咪唑[1,2- a]的电致发光性能通过制备具有ITO