AI Insight
This study presents a series of heterohelicene compounds rigidified through tetracoordinate boron centers, designed to achieve fragment-precise short-range charge transfer. The molecular architecture constrains conformational flexibility, enabling narrow-bandwidth near-infrared (NIR) emission by localizing the charge transfer between specific molecular fragments. The structural rigidity imposed by the boron coordination environment suppresses vibrational relaxation pathways, resulting in well-defined, narrow emission profiles in the NIR spectral region.
Why it matters
Narrow NIR-emitting organic materials are highly sought after for applications in bioimaging, night-vision displays, and optical communications, where spectral purity and emission efficiency are critical. This work provides a rational molecular design strategy that could guide the development of next-generation organic NIR emitters with controlled optical properties.
