Coordination-driven [2+2] metallo-macrocycles isomers: conformational control and photophysical properties

In recent years, fluorescent supramolecular materials have received significant attention due to their wide application prospects. However, the relationship between conformation of supramolecules and photophysical properties remains an open question. this study, two rhomboidal metallacycle isomers, SA SB, self-assembled with trans- cis-isomers tetraphenylethylene-based ditopic pyridyl ligands (LA LB), a 120° di-platinum (II) acceptor were prepared. Compared SB constructed by cis- tetraphenylethylene (TPE)-based ligand LB, curved trans-TPE-based LA can restrict molecular motions aromatic groups on TPE exhibits better light-emitting properties. Moreover, also exhibited fluorescence stability than isomer towards molecules strongly electron-withdrawing groups. This work provides new platform explore corresponding