Light-Emitting Coordination Polymers: Stimuli-Responsive Gels, PMMA-Based Composite Films, and UV-Shielding

Lanthanide-based light-emitting coordination polymers (CPs) and CP gels (CPGs) have significance for applications in optical systems, image processing/multiplexing, and optical sensors. In this study, we report two new luminescent CPs (EuL-CP (<b>1</b>) and TbL-CP (<b>2</b>)) and CPGs (EuL-gel (<b>5</b>) and TbL-gel (<b>6</b>)) using lanthanide(III) ions (Ln(III) = Eu(III) and Tb(III)) and 4-(4-carboxyphenyl)-2,2:6,2-terpyridine ligand (<b>L</b>) capable of forming stable thermoreversible gels. Probable structures of EuL-CP (<b>1</b>) and TbL-CP (<b>2</b>) and the formations of EuL-gel (<b>5</b>) and TbL-gel (<b>6</b>) are proposed based on adequate computational studies. The CPGs are stimuli-responsive and could be utilized as invisible security inks for encryption. Further, poly(methyl methacrylate) (PMMA) polymer doped with respective CPs (0.75 wt %) is found to be suitable for forming composite films with UV-shielding properties.