Interfacial Synthesis of a Monolayered Fluorescent Two‐Dimensional Polymer through Dynamic Imine Chemistry

A fluorescent monolayered two‐dimensional polymer (2DP) containing both tetraphenylethylene (TPE) and imine linkages is synthesized at air‐water interface using the Langmuir‐Blodgett method. We designed TPE‐based monomers with long distances between the TPE and the imine linkages to avoid the charge transfer and therefore keep the fluorescence. A monolayered 2DP provided with more than 104 μm(2) in domain size and around 0.8 nm thickness was obtained through a successive Schiff base reaction at air‐water interface. The nanostructures and fluorescent property of 2DP films were characterized by optical microscopy, SEM, TEM, AFM and fluorescence spectrum. Most importantly, the tip‐enhanced Raman spectroscopy (TERS) was utilized here to confirm the success of the polycondensation of monolayered 2DP.