By introducing the ethenyl-based group as an indispensable component of theπ-conjugation system between ligand quinoline ring and substituted-phenyl ring can amplify the conjugation and the addition of NO2 group can further strengthen this effect which results in the rigid, planar structure. The increasing conjugation effect narrows the HOMO-LUMO gap which makes the spectra bands red-shifted.
我们通过在配体喹啉环和苯环之间引入乙烯基作为共轭效应传递体,使取代基和苯环之间的共轭效应增加,使分子结构具有刚性平面的结构,导致HOMO-LUMO能隙变窄,光谱红移。
参考来源 - 金属有机配合物发光材料的理论研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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