Thermodynamic and mechanical properties of supramolecular gel based on bisterpyridine ligand formed via a cooperative model

Supramolecular gels hold immense potential in materials science, particularly in the development of functional materials for optoelectronics, sensors, and soft robotics. Their tunable mechanical properties and hierarchical self-assembly facilitate precise control over material structures and functions. Herein, we present a comprehensive study of the photophysical and mechanical properties of a supramolecular gel derived from a bisterpyridine ligand. The bisterpyridine ligand 1, incorporating alanine moieties as chiral units, was successfully synthesized. Notably, 1 exhibited gelation in aromatic solvents such as toluene and xylene, forming a supramolecular gel with a distinctive twisted fiber morphology. The heating and cooling curves exhibited non-sigmoidal shapes, indicating that supramolecular gel 1 prepared in toluene, was formed via a cooperative mechanism. The Gibbs free energy was calculated to be −32.82 kcal mol⁻¹. Furthermore, supramolecular gel 1 displayed strong blue emission, highlighting its potential for optoelectronic applications. The mechanical properties of 1 were investigated via rheometry, revealing a pronounced thixotropic behavior, indicative of a reversible gelation process. These findings underscore the adaptability and multifunctionality of supramolecular gel 1, making it a promising candidate for advanced material applications.