3D Boranil Complexes with Aggregation-Amplified Circularly Polarized Luminescence.

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Organic Electronics

Background:

• Small organic molecules with strong circularly polarized luminescence (CPL) are crucial for chiroptical devices and sensors.
• Developing molecules with high luminescence dissymmetry factors remains a significant challenge in materials science.

Purpose of the Study:

• To design and synthesize novel CPL-active boron-difluoride (BF2) complexes.
• To investigate the photophysical properties, including aggregation-amplified CPL, of these new complexes.

Main Methods:

• Synthesis of a new family of N̂O-chelated BF2 complexes fused with [2.2]paracyclophane.
• Characterization of photophysical properties in solution and solid states.
• Structural analysis using X-ray diffraction and theoretical calculations (TD-DFT).

Main Results:

• Successful synthesis of CPL-active BF2 complexes, denoted as (Rp)/(Sp)-3a-3e.
• Observed aggregation-amplified CPL with moderate dissymmetry factors and quantum yields.
• Correlation between structural features and photophysical behavior established through X-ray diffraction and TD-DFT.

Conclusions:

• The novel BF2 complexes exhibit promising CPL properties suitable for chiroptical applications.
• The fusion strategy with [2.2]paracyclophane effectively enhances CPL activity through aggregation.
• These findings provide insights into designing advanced CPL materials for sensing and optoelectronics.