Electron Deficient Monomers that Optimize Nucleation and Enhance the Photocatalytic Redox Activity of Carbon Nitrides. Issue 42 (9th September 2019)

• Record Type: Journal Article
• Authors: Zhang, Guigang; Liu, Minghui; Heil, Tobias; Zafeiratos, Spiros; Savateev, Aleksandr; Antonietti, Markus; Wang, Xinchen
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 42(2019)
• Page Start: 14950
• Page End: 14954
• Publication Date: 2019-09-09
• Subjects: carbon nitride -- electron deficient monomers -- packing geometry -- photocatalysis -- water splitting; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201908322
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Polymeric carbon nitride (PCN) is usually synthesized from nitrogen‐rich monomers such as cyanamide, melamine, and urea, but is rather disordered in many cases. Now, a new allotrope of carbon nitride with internal heterostructures was obtained by co‐condensation of very electron poor monomers (for example, 5‐amino‐tetrazole and nucleobases) in the presence of mild molten salts (for example, NaCl/KCl) to mediate the polymerization kinetics and thus modulate the local structure, charge carrier properties, and most importantly the HOMO and LUMO levels. Results reveal that the as‐prepared NaK‐PHI‐A material shows excellent photo‐redox activities because of a nanometric hetero‐structure which enhances visible light absorption and promotes charge separation in the different domains. Abstract : It's better in a melt : Copolymerization with electron‐deficient monomers in a salt melt optimizes the nucleation, local packing mode, band structure, and optical properties of carbon nitride polymers.