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首页> 外文期刊>RSC Advances >Design, synthesis and electronic properties of push-pull-push type dye
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Design, synthesis and electronic properties of push-pull-push type dye

机译：推挽式染料的设计，合成及电子性能

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A Sonogashira cross-coupling protocol was employed for the construction of a push-pull-push type dye. An ethynyl pi-spacer extends the effective pi-conjugation length between push and pull units without altering the planarity of the electron donor/acceptor pair. The variation of the strength of the alkyne pi-spacer electron push (or donor) units of these dyes has a strong effect on the shifting of both absorption and emission maxima and thereby on the Stokes shift. The dyes were solvatochromic and their solvatochromicity was highly dependent on the electron push unit. Strong red shifted emissions were likely to arise due to the internal charge transfer (ICT) from the electron push unit to the electron pull unit. Calculated energy values of HOMO -> LUMO transitions are in good accordance with experimental observations. Alkyne conjugated electron push units (-C C-Ar; Ar = Ph, Ph-OMe, Ph-NMe2) are more effective to increase the E-HOMO levels. Overall, experimental and theoretical results of the push-pull-push dyes indicate that they can be used as promising conjugated materials with predictable electronic properties for optoelectronic devices.
机译：Sonogashira交叉偶联方案用于构建推挽式染料。乙炔基pi间隔基可在推拉单元之间延长有效pi共轭长度，而不会改变电子供体/受体对的平面度。这些染料的炔基π-间隔基电子推动（或供体）单元强度的变化对吸收和发射最大值的移动都有很大影响，从而对斯托克斯位移也有很大的影响。染料是溶剂变色的，它们的溶剂变色高度依赖于电子推动单元。由于从电子推动单元到电子牵引单元的内部电荷转移（ICT），很可能会产生强烈的红移发射。计算出的HOMO-> LUMO跃迁的能量值与实验观察结果非常吻合。炔共轭电子推动单元（-C C-Ar; Ar = Ph，Ph-OMe，Ph-NMe2）对提高E-HOMO水平更有效。总体而言，推挽式染料的实验和理论结果表明，它们可以用作具有前景的共轭材料，并具有可预测的电子性能，可用于光电器件。

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