Impact of Ion‐Pairing Effects on Linear and Nonlinear Photophysical Properties of Polymethine Dyes**,ChemPhysChem

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Impact of Ion‐Pairing Effects on Linear and Nonlinear Photophysical Properties of Polymethine Dyes**
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-11-11 , DOI: 10.1002/cphc.202000731
Simon Pascal _{1,

2} , San‐Hui Chi ₃ , Joseph W. Perry ₃ , Chantal Andraud ₁ , Olivier Maury ₁

Affiliation

The two‐photon absorption (2PA) and photophysics of heptamethine dyes featuring cyanine or dipolar electronic structures have been compared for the first time. The perfectly delocalized cyanine system is classically characterized by a two‐photon transition matching the vibronic component of its lower energy absorption band. The dipolar species is generated by ion‐pairing with a hard counterion in a non‐dissociating solvent and displays significant modifications oft he optical properties, including a significant hypochromic shift of absorption, weaker emission and 2PA matching the lower energy transition, thus revealing symmetry breaking within the polymethine electronic structure.

中文翻译：

离子对效应对聚次甲基染料线性和非线性光物理性质的影响**

首次比较了具有花青或偶极电子结构的七甲胺染料的双光子吸收（2PA）和光物理特性。的完美离域Ç yanine系统经典特征在于双光子跃迁匹配其较低的能量吸收带的电子振动分量。双极性物质是通过在非解离溶剂中与硬抗衡离子进行离子配对而产生的，并且显示出光学性质的显着变化，包括吸收的显色性显着偏移，发射强度较弱以及与较低能量跃迁匹配的2PA，因此揭示了对称性破坏在聚次甲基电子结构中。

更新日期：2020-12-02

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