Aug 2026· Angewandte Chemie· pp.
e8182546
· 0 citations· 41 references
Medicine
Abstract
Developing artificial photosynthesis systems that couple hydrogen peroxide (H2O2) production with organic valorization remains challenging due to rapid carrier recombination. Herein, indazole-linked covalent organic frameworks (COFs) were constructed via Cadogan reductive cyclization of nitro-functionalized imine-linked precursors, which converts labile imine linkages into robust indazole linkages while preserving high crystallinity and enhancing visible-light harvesting ability. Remarkably, in a synergistic system coupling H2O2 production with furfuryl alcohol oxidation, indazole-linked COFs exhibited a nearly 5.6-fold enhancement in photocatalytic performance compared to its imine-linked counterpart. Combined in situ DRIFTS and DFT calculations revealed that the indazole linkage optimizes interfacial reaction kinetics and facilitates substrate adsorption through polarized nitrogen sites. This work establishes heterocyclic linkage engineering as an effective strategy for designing advanced crystalline photocatalysts toward integrated solar energy conversion.
Achieving a photocatalytic reductive quenching cycle that enables direct oxidation of the photocatalyst radical anion by H(I) species, without requiring stoichiometric oxidants or cocatalysts, remains a long-standing challenge in artificial photoredox catalysis. Here we report a bioinspired approach based on the lignin...
Xiang-Feng Lin, A. Umar, Jia-Xian Zheng et al.· Science Advances· 0 citations
Polymorphism in covalent organic frameworks (COFs) offers a unique platform to decipher structure-property relationships, yet its impact on excited-state dynamics remains unexplored. Herein, we construct two chemically identical but topologically distinct 1D and 2D COF polymorphs to correlate framework architecture wit...
Innovation of sustainable and efficient catalytic systems for controlled aerobic oxidation of alcohols remains a fundamental challenge in green chemistry. Here, we report a phenothiazine‐functionalized covalent organic cage (
P
2
D
3
R
) as a robust heterogeneous platform for photocatalytic dehydrogenat...
S. Pratibha, Neha Gautam, Pallab Bhandari et al.· Annalen der Pharmacie· 0 citations
Photocatalytic oxygen reduction reaction (ORR) is a promising route for sustainable H2O2 synthesis, enabling on-demand production and in situ water remediation, yet it is still hampered by poor charge separation and migration, as well as sluggish O2 adsorption and activation. Herein, salen-based covalent organic polyme...
Jin Song, Shuang Cheng, Yijia Xu et al.· Small· 1 citation
Viologen-linked covalent organic frameworks (Vio-COFs) are an emerging class of charged, redox-active porous materials that effectively combine long-range structural order with tunable electronic and ionic functionalities. The incorporation of viologen units imparts intrinsic positive charge, reversible redox activity,...
Qamar-un-nisa Tariq, Si-Yun Deng, Yan-Ling Yao et al.· Materials Futures· 0 citations
Addressing the dual challenges of radioiodine pollution and rising CO
2
emissions, we report a series of five robust imidazole‐based covalent organic polymers (
iCOP1–5
) synthesized via a microwave‐assisted, one‐pot [3 + 2] cyclopentannulation reaction. The design strategy leverages a nitrogen‐rich tetra‐ethynyl...
Noorullah Baig, Hassan H. Hammud, Suchetha Shetty et al.· ChemNanoMat· 0 citations
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