Effects of Counterions with Multiple Charges on the Linear and Nonlinear Optical Properties of Polymethine Salts

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• 作者：Zhong’an Li ; Hyeongeu Kim ; San-Hui Chi ; Joel M. Hales ; Sei-Hum Jang ; Joseph W. Perry ; Alex K.-Y. Jen
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：May 10, 2016
• 年：2016
• 卷：28
• 期：9
• 页码：3115-3121
• 全文大小：354K
• 年卷期：0
• ISSN：1520-5002

文摘

Counterions with multiple charges have been used to organize polymethines into multichromophore salt complexes. The intramolecular Coulombic interactions between multiply charged counterions and polymethines can play a significant role in modifying intermolecular interactions (i.e., aggregation). Here, we report a detailed study of the linear and nonlinear optical properties of such complexes with dications and hexacations over a large range of molecular concentrations. Our results have demonstrated that, despite strong intramolecular interactions, the preorganization of chromophores into the multichromophore salt constructs with multiple charges can provide a steric repulsive effect that can mitigate intermolecular interactions in the solid state. This results in a more efficient translation between microscopic and macroscopic optical properties for highly polarizable polymethines, which is essential for all optical signal switching.