Lower Critical Solution Temperature Active Supramolecular π‐Systems for Smart Applications

Stimuli‐responsive supramolecular systems have emerged as an essential requirement for a wide range of smart applications in material sciences and biology. Among various responses, thermal response is a common functional characteristic of macromolecular and supramolecular systems. For example, polyacrylamides and their variants are known to exhibit a phenomenon called lower critical solution temperature (LCST) under aqueous conditions, which is a heat‐induced phase change from a transparent to opaque state. Similarly, numerous amphiphilic supramolecular systems are known to exhibit LCST properties. π‐Conjugated molecules are emerging as preferred building blocks for the construction of LCST active supramolecular materials owing to their inherent electronic and optical properties, which are sensitive to temperature variations. A variety of amphiphilic π‐systems have been reported for the creation of dynamic and adaptive LCST materials, and a combined analysis of such materials is important for further developments. In this minireview, we describe how researchers have exploited the LCST property of supramolecular π‐systems for various smart applications, such as smart windows and nanothermometers, and discuss their future potential and challenges.