Counteranion-controlled aggregation-induced emission in 10H-pyrido[1,2-a]-5-indolium salts: structure–property relationships and anion–π+ interactions

Shota Mizuno; Haruka Suzuki; Kunihiko Kato; Yasuhiro Kubota; Toshiyasu Inuzuka; Takayuki Ban; Kazumasa Funabiki

doi:10.1039/D5NJ03620H

You do not have JavaScript enabled. Please enable JavaScript to access the full features of the site or access our non-JavaScript page.

Counteranion-controlled aggregation-induced emission in 10H-pyrido[1,2-a]-5-indolium salts: structure–property relationships and anion–π⁺ interactions†

Shota Mizuno,

^a Haruka Suzuki,^a Kunihiko Kato,^a Yasuhiro Kubota,^a Toshiyasu Inuzuka,^b Takayuki Ban

^a and Kazumasa Funabiki

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry and Biomolecular Science, Gifu University, 1-1, Yanagido, Gifu 501-1193, Japan
E-mail: funabiki.Kazumasa.m6@f.gifu-u.ac.jp

^b Division of Instrumental Analysis, Life Science Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

Abstract

We synthesized fluorescent 10H-pyrido[1,2-a]-5-indolium salts and studied the variations in their optical and structural properties with different counteranions. Spectroscopic and crystallographic analyses revealed anion-dependent changes in absorption coefficients, fluorescence intensity, and intermolecular interactions. Furthermore, the compounds exhibited aggregation-induced emission (AIE) behavior. These findings highlight the potential of anion control for tuning the fluorescence behavior of advanced dyes and photofunctional materials

Download options Please wait...

Supplementary files

Article information

DOI: https://doi.org/10.1039/D5NJ03620H
Article type: Paper
Submitted: 09 Sep 2025
Accepted: 28 Oct 2025
First published: 29 Oct 2025

Download Citation

New J. Chem., 2025, Advance Article

Permissions

Request permissions

Counteranion-controlled aggregation-induced emission in 10H-pyrido[1,2-a]-5-indolium salts: structure–property relationships and anion–π⁺ interactions

S. Mizuno, H. Suzuki, K. Kato, Y. Kubota, T. Inuzuka, T. Ban and K. Funabiki, New J. Chem., 2025, Advance Article , DOI: 10.1039/D5NJ03620H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

New Journal of Chemistry