Self‐Limiting Polymerization‐Induced Crystallization‐Driven Self‐Assembly (SL‐PI‐CDSA) Enables Templated Synthesis of Chiral Plasmonic, Hybrid 2D Hexagonal Assemblies

ABSTRACT Examples of self‐regulating synthetic self‐assembly are relatively few, with most known chemical systems relying on kinetic rather than thermodynamic control. Herein, we demonstrate the rapid generation ( t ≤ 5 min) of size‐tunable ultralow dispersity ( Ð ≤ 1.01) 2D hexagonal nanosheets governed by self‐limiting self‐assembly (SLSA). Self‐assembly in natural systems occurs with exquisite control of structure, function, and dimension. We demonstrate that key aspects of biological assembly can be rationally applied toward the development of bottom‐up approaches for the construction of chiral nanomaterials. To this end, self‐limiting polymerization‐induced crystallization‐driven self‐assembly (SL‐PI‐CDSA) of modular and templating aryl isocyanide (AIC) monomers yields functional 2D assemblies permitting post‐polymerization/assembly modifications. Detailed study of the internal and external structure of the hexagonal nanosheets reveals topological defects which offer mechanistic insights into both their assembly and subsequent utilization. Specifically, these features enable fabrication of chiral hybrid organic–inorganic nanomaterials incorporating chiral plasmonic metal nanoparticles (MNPs). Our results suggest that the synergistic interplay of template‐driven confinement and hierarchical chirality induce symmetry breaking of in situ‐generated gold MNPs. We anticipate that the platform presented will facilitate fabrication of new hybrid, chiral organic–inorganic nanostructures.