Synthesis of Highly Luminescent Chiral Nanographene. Issue 4 (20th December 2022)

• Record Type: Journal Article
• Authors: Li, Ji‐Kun; Chen, Xing‐Yu; Zhao, Wen‐Long; Guo, Yun‐Long; Zhang, Yi; Wang, Xin‐Chang; Sue, Andrew C.‐H.; Cao, Xiao‐Yu; Li, Meng; Chen, Chuan‐Feng; Wang, Xiao‐Ye
• Is Part Of: Angewandte Chemie international edition. Volume 62:Issue 4(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-20
• Subjects: Chirality -- Circularly Polarized Luminescence -- Helicene -- Nanographene -- Polycycles; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202215367
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Chiral nanographenes with both high fluorescence quantum yields ( Φ F ) and large dissymmetry factors ( g lum ) are essential to the development of circularly polarized luminescence (CPL) materials. However, most studies have been focused on the improvement of g lum, whereas how to design highly emissive chiral nanographenes is still unclear. In this work, we propose a new design strategy to achieve chiral nanographenes with high Φ F by helical π‐extension of strongly luminescent chromophores while maintaining the frontier molecular orbital (FMO) distribution pattern. Chiral nanographene with perylene as the core and two dibenzo[6]helicene fragments as the wings has been synthesized, which exhibits a record high Φ F of 93 % among the reported chiral nanographenes and excellent CPL brightness ( B CPL ) of 32 M −1 cm −1 . Abstract : A perylene‐based chiral nanographene has been synthesized through helical π‐extension of highly emissive chromophores whilst maintaining the frontier molecular orbital distributions. This nanographene exhibits excellent luminescence properties, with a record high Φ F of 93 % among chiral nanographenes and a remarkable CPL brightness of 32 M −1 cm −1 .