Coupling molecular rigidity and flexibility on fused backbones for NIR-II photothermal conversion

Journal article

The photophysical properties of novel 2-quinolinone derivatives were examined to evaluate their potential as photocatalysts using fluorescence and UV-Vis absorbance spectroscopy. The fluorescence quantum yields were determined via the relative comparative method, using target absorbance values at a specific wavelength to prepare solutions and comparing these measurements to the reference molecule carbostyril-124. Molar absorptivity values were also calculated to assess the light absorption properties for each compound. Among the derivatives, PAV-3 presented with the highest molar absorptivity and fluorescence quantum yield values (ε= 15297.3 M-1 cm-1, ΦF= 17.1%), while PAV-5 showed the lowest (ε= 4796.2 M-1 cm-1, ΦF= 2.3%). The reduced photophysical properties of PAV-5 were a direct result of the derivative\u27s rigid structure, which allowed for a greater portion of absorbed light to be dissipated through non-radiative pathways, marking this derivative as the most promising 2-quinolinone derivative for photocatalytic applications

Authors: He, Y; Liao, H; Lyu, S; Xu, X-Q; Li, Z

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Royal Society of Chemistry
• Journal: Chemical Science
• Volume: 12
• Issue: 14
• Pages: 5177-5184
• Publication date: 2021-04-15
• DOI: 10.1039/d1sc00060h
• EISSN: 2041-6539
• ISSN: 2041-6520
• Language: English
• Keywords: Coupling (piping); Chemistry; Molecular physics; Nanotechnology; Rigidity (electromagnetism); Structural rigidity; Chemical physics; Flexibility (engineering); Stereochemistry; Optoelectronics; Organic chemistry; Photothermal therapy; Hydrogen bond; Molecule; Intramolecular force; Materials science; Composite material; Photochemistry; Structural engineering