Controlling Sign and Magnitude of Circularly Polarized Luminescence of Axially Chiral Schiff‐Base Boron Difluoride Complexes Bearing Polyethylene Glycol Chains

Chirality, Journal Year: 2025, Volume and Issue: 37(1)

Published: Jan. 1, 2025

ABSTRACT The synthesis, structure, and circularly polarized luminescence (CPL) properties of axially chiral boron difluoride complexes are described. A series optically pure bis (boron difluoride) were prepared in 5 steps from commercially available ( S )‐ or R )‐BINOL as starting materials. found to exhibit similar yellow photoluminescence solution, regardless the type substituents on nitrogen atoms. Notably, for complex with polyethylene glycol chains, homogeneous transparent films formed by drop‐cast method, showing intense CPL a different sign that solution state. Density functional theory (DFT) calculations performed understand their photophysical behavior including configuration‐dependent properties.

Language: Английский

---

Axially-chiral boramidine for detailed (chir)optical studies

Chemical Science, Journal Year: 2024, Volume and Issue: 15(17), P. 6530 - 6535

Published: Jan. 1, 2024

The inclusion of boron atoms into chiral π-conjugated systems is an effective strategy to unlock unique chiroptical properties. Herein, the preparation and characterization a configurationally stable axially-chiral boramidine are reported, showcasing absorption in UV domain, deep-blue fluorescence (Φ up 94%), ca. |10-3| gabs glum values. Detailed photophysical studies quantum-chemical calculations clearly elucidate deactivation pathways emissive state triplet excited states, involving increased spin-orbit coupling between lowest singlet upper state.

Language: Английский

---

Switching of Circularly Polarized Luminescence via Dynamic Axial Chirality Control of Chiral Bis(Boron difluoride) Complexes with Salen Ligands

ChemPhotoChem, Journal Year: 2024, Volume and Issue: unknown

Published: May 22, 2024

Abstract The intensity and handedness of circularly polarized luminescence (CPL) were successfully controlled by dynamic molecular motion in solutions. Bis(boron difluoride) complexes with chiral salen ligands synthesized their photophysical properties investigated. Although these showed rapid rotation about the C−N bond axis solution at room temperature, two conformers assigned as atropisomers observed NMR spectra low temperature. Furthermore, equilibrium was found to change depending on external environment, such solvent allowing precise control CPL without color shifts. Theoretical calculations based density functional theory (DFT) revealed that intramolecular exciton coupling is key changes properties.

Language: Английский

---

Blue Luminescent Boron Complexes Based on N,N‐Type Imidazo[1,5‐a]pyridine Ligand for Mitochondrial Imaging

Asian Journal of Organic Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: June 14, 2024

Abstract We have synthesized two boron complexes based on N , ‐type bidentate imidazo[1,5‐ a ]pyridine ligands exhibiting blue emission with good quantum yields in solution. The transient absorption and theoretical studies of the indicated intramolecular charge transfer nature. In addition, one specific complex, 1 was found to work as mitochondrial imaging agent.

Language: Английский

---

In silico study on helicenes in hydrophobic natural deep eutectic solvent

FlatChem, Journal Year: 2024, Volume and Issue: unknown, P. 100769 - 100769

Published: Oct. 1, 2024

Language: Английский

---