Chiroptical Properties of Oligomeric Squaraine Dyes

低聚方酸菁染料的手性光学性质

• 批准号: 451483110
• 负责人: Professor Dr. Christoph Lambert
• 金额: --
• 依托单位: Institut für Organische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/451483110?language=en
• 关键词: Chiroptical; Properties; Oligomeric; Squaraine; Dyes

Chiral chromophores are widely used as chiroptical molecular sensors, as catalyst in photochemical reactions and as emitters in OLEDs with circular polarized luminescence (CPL). The generation of strong chiroptical effects, that is, a high rotatory strength of circular dichroism and an intense circular polarized luminescence, are in focus of the development and application of chiral chromophores. Molecular oligomeric and polymeric squaraine dyes also possess a broad potential for applications in biomedicine and optoelectronic devices. They show intense absorption bands in the red to near-infrared spectral region with high fluorescence quantum yields. Thus, we intend to use these advantageous optical properties and to extend them with chiroptical properties. The synthesis of chiral oligomeric squaraine dyes and the characterisation of their chiroptical properties for future applications in optoelectronic devices thus is the prime goal of this project. Hereby, we shall incorporate the chiral centre directly into the pi-system of the indolenine squaraine dyes, and not, as has be done in previously known chiral squaraines, by simply attaching chiral side chains. In that way, we hope to increase the chiroptical properties significantly. These properties shall further be enhanced by the synthesis of dimers and helical foldamers, because for oligomers we expect a coupling of optical transitions of monomeric squaraines by the exciton chirality effect.

手性发色团被广泛用作手性分子传感器，在光化学反应中用作催化剂，在具有圆形极化发光（CPL）的OLED中用作催化剂。强烈的手性效应的产生，即圆形二色性的高旋转强度和强烈的圆形极化发光，是手性发色团的发展和应用的重点。分子寡聚和聚合物方形染料在生物医学和光电设备中的应用也具有广泛的潜力。它们显示出具有高荧光量子产率的红色至近红外光谱区域的强烈吸收带。因此，我们打算使用这些有利的光学特性，并使用手柄性能扩展它们。手性寡聚方形染料的合成及其在光电设备中未来应用的手性特性的表征是该项目的主要目标。在此，我们将直接将手性中心直接纳入吲哚美氨酸方形染料的PI系统中，而不是像以前已知的手性方形链中那样简单地连接手性侧链，而不是像以前已知的手性方形。这样，我们希望大幅度提高手势性能。这些特性应通过二聚体和螺旋折叠剂的合成进一步增强，因为对于低聚物，我们期望通过激子手性效应偶联单体方形的光学跃迁。