Enhancing Fluorescence in Both Solution and Solid States Induced by Imine Cage Formation

Bhandari, P and Ahmed, S and Saha, R and Mukherjee, PS (2023) Enhancing Fluorescence in Both Solution and Solid States Induced by Imine Cage Formation. In: Chemistry - A European Journal .

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Abstract

Developing luminescent materials that exhibit strong emissions in both solution and solid phases is highly desirable and challenging. Herein, we report imine-bond directed formation of a rigid organic cage (TPE-cage) that was synthesized by 2+4 imine condensation of a TPE-cored tetra-aldehyde (TPE-TA) with a clip-like diamine (XA) to illustrate confinement-induced fluorescence enhancement. Compared to the non-emissive TPE-TA (�F=0.26 %) in the dichloromethane (DCM) solution, the TPE-cage achieved a remarkable (~520-fold) emission enhancement (�F=70.38 %). In contrast, a monomeric tetra-imine model compound (TPE-model) showed only a minor enhancement (�F=0.56 %) in emission compared to the parent tetra-aldehyde TPE-TA. The emission of TPE-cage was further enhanced by ~1.5-fold (�F=80.96 %) in the aggregated state owing to aggregation-induced emission enhancement (AIEE). This approach establishes the potential for synthesizing luminescent materials with high emission in both solution and solid-state by employing a single-step imine condensation reaction. © 2023 Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	Chemistry - A European Journal
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Department/Centre:	Others
Date Deposited:	04 Mar 2024 10:05
Last Modified:	04 Mar 2024 10:05
URI:	https://eprints.iisc.ac.in/id/eprint/84083

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