Supramolecular Assembly and Circularly Polarized Phosphorescence of Tridentate Platinum‐Isocyanide Complexes Modified with a Chiral Leucine Derivative

Abstract Recently, the exploration of circularly polarized luminescence (CPL)‐active materials has attracted extensive attention. Herein, a pair of enantiomeric tridentate platinum‐isocyanide complexes ( D/L )‐ 5 decorated with a chiral leucine methyl ester are reported. The enhanced red phosphorescence and amplified CPL of ( D/L )‐ 5 with a luminescent dissymmetric factor up to 0.008 and quantum yield of 67% are achieved via solution‐state aggregation, benefiting from the highly‐ordered nanobelt assembly as revealed by microscopic analyses. On the basis of the temperature‐dependent absorption, 2D NOESY NMR and powder X‐ray diffraction spectral investigations, these nanobelts are proposed to form via the cooperative assembly pathway with a head‐to‐tail molecular stacking. This work provides insight into the mechanism of supramolecular chirality amplification and important information for the design and synthesis of high‐performance CPL‐active materials.