Recent Advances in NIR-Switchable Multi-Redox Systems Based on Organic Molecules
Takashi Harimoto1,2, Yusuke Ishigaki1
1Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 6, 2024
Summary
Organic electrochromic molecules offer eco-friendly near-infrared (NIR) switching. This review highlights small molecules with heteroatoms and π-extension for stable NIR absorption control, crucial for advanced material and life science applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Electrochemistry
Background:
- Electrochromic systems switching near-infrared (NIR) absorption are vital for material and life sciences.
- Organic electrochromic systems are desirable for reduced environmental impact and enhanced biocompatibility.
- Achieving reversible and durable NIR absorption switching in organic molecules remains a significant challenge.
Purpose of the Study:
- To review advances in organic electrochromic small molecules for NIR absorption switching.
- To focus on strategies like heteroatom incorporation and π-extension for improved stability.
- To present studies on electrochemical, spectroscopic, and structural properties of these molecules.
Main Methods:
- Focus on redox-active small molecules with controlled redox states.
- Analysis of electrochemical properties for redox interconversion.
- Spectroscopic and structural characterization of charged states.
Main Results:
- Incorporation of heteroatoms and π-extension enhance charge/spin delocalization.
- Well-defined small molecules demonstrate effective ON/OFF switching of NIR absorption.
- Strategies improve reversibility and durability during redox cycling.
Conclusions:
- Organic small molecules with tailored structures are promising for stable NIR electrochromism.
- Precise control over redox states is key to achieving desired optical switching.
- These advancements pave the way for practical applications in material and life sciences.
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