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首页> 外文会议>Conference on Linear and Nonlinear Optics of Organic Materials III; Aug 4-6, 2003; San Diego, California, USA >Properties and chemical environment effects of alkylamino styryl pyrazine two-photon fluorophores
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Properties and chemical environment effects of alkylamino styryl pyrazine two-photon fluorophores

机译：烷基氨基苯乙烯基吡嗪二光子荧光团的性质和化学环境效应

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摘要

Advancement over the past decade of materials based on two-photon absorption has been phenomenal; yet, a need for greater understanding of multi-photon processes remains. Questions of design to maximize two-photon absorbance cross-sections and quantum yields have been addressed quantitatively. However, effects of the chemical environment on the absorption and emission processes in these chromophores are largely unexplored. This study presents the effects of 26 different solvents on the absorption and emission characteristics of a set of six new alkylamino-substituted styryl pyrazines. The solvatochromic comparison method is employed to derive structure-optical property relationships within this family of fluorophores, and the effects of solvent polarity, hydrogen bonding and inductive and dispersive forces are discussed. Electrostatic and transition moments are measured and their contributions to two-photon absorbance cross-sections (δ_(TPA)) are discussed. Symmetric D-π-A-π-D molecular architecture is thought to play a very important role in increasing δ_(TPA) by disrupting the degeneracy of excited states and increasing one- and two-photon transition probabilities. The coupling of strong electron donors to strong electron acceptors with symmetric D-π-A-π-D molecular architecture is shown to produce fluorophores with exceptional two-photon activities.
机译：在过去的十年中，基于双光子吸收的材料取得了惊人的进步。然而，仍然需要更多地了解多光子过程。定量解决了最大化双光子吸收截面和量子产率的设计问题。然而，在这些生色团中，化学环境对吸收和发射过程的影响尚待探索。这项研究提出了26种不同溶剂对一组六种新的烷基氨基取代的苯乙烯基吡嗪的吸收和发射特性的影响。采用溶剂变色比较方法来推导该荧光团家族中的结构-光学性质关系，并讨论了溶剂极性，氢键以及感应和分散力的影响。测量了静电和跃迁矩，并讨论了它们对双光子吸收截面（δ_（TPA））的贡献。对称的D-π-A-π-D分子结构被认为通过破坏激发态的简并并增加一光子和二光子跃迁几率在增加δ_（TPA）中起着非常重要的作用。研究表明，强电子给体与具有对称D-π-A-π-D分子结构的强电子受体的偶联会产生具有出色的双光子活性的荧光团。

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