Piercing Molecular Graphenes: Precision Synthesis and Photophysics of NBN-Edged Porous Molecular Carbons DOI
Yang Yu, Asier E. Izu, José Manuel Marín-Beloqui

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 28, 2025

Bottom-up solution-phase synthesis of atomically precise porous nanographenes is a challenging endeavor. In particular, molecular carbons with multiple pores and heteroatoms remain unknown. Herein, we report three (2PNG, 3PNG, 7PNG) NBN-doped zigzag edges, in which 7PNG possesses seven pores. X-ray crystallographic diffraction scanning tunneling microscopy reveal their unique pore structures self-assembly behaviors. Interestingly, the HOMO-LUMO overlap these molecules gradually decreases as size molecule increases, induces peripheral-to-core excitations promotes intersystem crossing. Steady-state transient spectroscopy, along DFT calculations, excited-state dynamics size-dependent energy-transfer mechanism systems. Our study describes new strategy for producing minimal wave function overlaps at almost planar geometry by segmenting electronic graphene insertion pores, forcing excitation to occur between periphery core, great potential phosphorescent delayed fluorescence emitters.

Language: Английский

Synthesis and Chiroptical Properties of a Saddle-Shaped Quadruple Helicene with a Cyclooctatetrapyrrole Core DOI
Xu‐Lang Chen,

Si-Qian Yu,

Ziming Cheng

et al.

Organic Letters, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

A quadruple helicene with a cyclooctatetrapyrrole core was synthesized via simple Ullmann reaction. Its single-crystal structure exhibits saddle shape. The compound shows fluorescence emission λem = 575 nm and good chiroptical properties, including dissymmetric absorption factor (|gabs|) of 5.84 × 10–3 (|glum|) 1.21 10–2.

Language: Английский

Citations

0
Chiral nanographenes exhibiting circularly polarized luminescence DOI Creative Commons
V. Ravi Kumar,

J. Páez,

Sandra Míguez‐Lago

et al.

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Chiral nanographenes: molecular architecture, key constituents, and their circularly polarized luminescence.

Language: Английский

Citations

0
Double [8]Helicene Featuring a Dibenzo[g,p]chrysene Core: Synthesis and Chiroptical Response DOI
Xu‐Lang Chen, Ziming Cheng, Zhaoliang Zheng

et al.

Organic Letters, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Double [8]helicene 1, featuring a dibenzo[g,p]chrysene core, was synthesized via the Scholl reaction, and its structure unambiguously confirmed by single-crystal X-ray diffraction analysis of dicationic salt [1-Cl]2+·(SbCl6-)2. The compound exhibits red fluorescence with an emission maximum at 618 nm (λem) quantum yield 16.2%, highlighting potential in optoelectronic applications. Furthermore, circular dichroism (CD) circularly polarized luminescence (CPL) measurements reveal notable chiroptical activity, absorption dissymmetry factors |gabs| = 5.11 × 10-3 |glum| 7.1 10-4, respectively.

Language: Английский

Citations

0
Piercing Molecular Graphenes: Precision Synthesis and Photophysics of NBN-Edged Porous Molecular Carbons DOI
Yang Yu, Asier E. Izu, José Manuel Marín-Beloqui

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 28, 2025

Bottom-up solution-phase synthesis of atomically precise porous nanographenes is a challenging endeavor. In particular, molecular carbons with multiple pores and heteroatoms remain unknown. Herein, we report three (2PNG, 3PNG, 7PNG) NBN-doped zigzag edges, in which 7PNG possesses seven pores. X-ray crystallographic diffraction scanning tunneling microscopy reveal their unique pore structures self-assembly behaviors. Interestingly, the HOMO-LUMO overlap these molecules gradually decreases as size molecule increases, induces peripheral-to-core excitations promotes intersystem crossing. Steady-state transient spectroscopy, along DFT calculations, excited-state dynamics size-dependent energy-transfer mechanism systems. Our study describes new strategy for producing minimal wave function overlaps at almost planar geometry by segmenting electronic graphene insertion pores, forcing excitation to occur between periphery core, great potential phosphorescent delayed fluorescence emitters.

Language: Английский

Citations

0