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首页> 外文期刊>Chemistry: A European journal >Synthesis, fluorescence, and two-photon absorption of a series of elongated rodlike and banana-shaped quadrupolar fluorophores: A comprehensive study of structure-property relationships
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Synthesis, fluorescence, and two-photon absorption of a series of elongated rodlike and banana-shaped quadrupolar fluorophores: A comprehensive study of structure-property relationships

机译：一系列细长的棒状和香蕉形四极荧光团的合成，荧光和双光子吸收：结构-性质关系的综合研究

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摘要

An extensive series of push-push and pull-pull derivatives was prepared from the symmetrical functionalization of an ambivalent core with conjugated rods made from arylene-vinylene or arylene-ethynylene building blocks, bearing different acceptor or donor end-groups. Their absorption and photoluminescence, as well as their two-photon-absorption (TPA) properties in the near infrared (NIR) region, were systematically investigated to derive structure-property relationships and to lay the guidelines for both spectral tuning and amplification of molecular TPA in the target region. Whatever the nature of the core or of the connectors, push-push systems were found to be more efficient than pull-pull systems, and planarization of the core (fluorene versus biphenyl) always leads to an increase in the TPA cross sections. In contrast, increasing the conjugation length as well as replacement of a phenylene moiety by a thienylene moiety in the conjugated rods did not necessarily lead to increased TPA responses. The present study also demonstrated that the topology of the conjugated rods can dramatically influence the TPA properties. This is of particular interest in terms of molecular engineering for specific applications, as both TPA properties and photoluminescence characteristics can be considerably affected. Thus, it becomes possible to optimize the transparency/TPA and fluorescence/TPA efficiency tradeoffs for optical limiting in the red-NIR region (700-900nm) and for two-photon-excited fluorescence (TPEF) microscopy applications, respectively.
机译：通过使用由亚芳基-亚乙烯基或亚芳基-亚乙炔基结构单元制成的带有不同受体或供体端基的共轭棒对价骨架的对称官能化，制备了一系列广泛的推挽式和推挽式衍生物。系统地研究了它们的吸收和光致发光，以及它们在近红外（NIR）区域的双光子吸收（TPA）特性，以推导其结构性质关系，并为分子TPA的光谱调谐和扩增奠定了指南在目标区域中。无论芯或连接器的性质如何，都发现推-推系统比拉-推系统更有效，并且芯的平面化（芴与联苯）总是导致TPA横截面增加。相反，在共轭棒中增加共轭长度以及用亚噻吩部分取代亚苯基部分并不一定导致TPA响应增加。本研究还表明，共轭棒的拓扑结构可以显着影响TPA性能。对于特定应用的分子工程而言，这尤其令人感兴趣，因为TPA特性和光致发光特性都会受到很大影响。因此，有可能分别优化红色/ NIR区域（700-900nm）的光学限制和两光子激发荧光（TPEF）显微镜应用的透明度/ TPA和荧光/ TPA效率折衷。

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