Electron Push-Pull Effect of Benzotrithiophene-Based Covalent Organic Frameworks on the Photocatalytic Degradation of Pharmaceuticals and Personal Care Products

Molecules, Journal Year: 2025, Volume and Issue: 30(2), P. 336 - 336

Published: Jan. 16, 2025

A covalent organic framework (COF) has emerged as a promising photocatalyst for the removal of pharmaceutical and personal care product (PPCP) contaminants; however, high-performance COF photocatalysts are still scarce. In this study, three were successfully synthesized by condensation benzo[1,2-b:3,4-b':5,6-b'']trithiophene-2,5,8-tricarbaldehyde (BTT) with 4,4',4''-(1,3,5-triazine-2,4,6-triyl)trianiline (TAPT), 1,3,5-Tris(4-aminophenyl)benzene (TAPB), 4,4',4''-nitrilotris(benzenamine) (TAPA), namely, BTT-TAPA, BTT-TAPB, BTT-TAPT, respectively. The surface areas BTT-TAPT found to be 800.46, 1203.60, 1413.58 cm2∙g-1, respectively, providing abundant active sites photocatalytic reactions. Under visible-light irradiation, exhibited highest rate tetracycline (TC), reaching 82.7% after 240 min. superior performance was attributed its large specific area strong electron-acceptor properties triazine group. Electron paramagnetic resonance capture experiments liquid chromatograph mass spectrometer analysis confirmed that superoxide radicals played pivotal role in degradation TC ciprofloxacin. Moreover, high stability reproducibility during process. This study confirms BTT-based COFs class PPCPs water, their can further optimized tuning structure composition frameworks.

Language: Английский

Functionalized Oxindole Construction via a Cyano Migration and Cyclization Relay Strategy

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

Published: April 24, 2025

A visible-light-induced trifunctionalization of unactivated alkenes for building functionalized oxindoles through a radical cyano migration strategy is reported. This transformation employs tandem alkene sulfonylation-initiated migration/cyclization cascade process. features stable and easily accessible substrates, mild reaction conditions, metal-free catalysts, the capability late-stage functionalization.

Language: Английский