The central role of the metal ion for photoactivity: Zn– <i>vs.</i> Ni–Mabiq
作者:Raphael Lauenstein、Sophie L. Mader、Henrieta Derondeau、Oaikhena Z. Esezobor、Matthias Block、Armin J. Römer、Christian Jandl、Eberhard Riedle、Ville R. I. Kaila、Jürgen Hauer、Erling Thyrhaug、Corinna R. Hess
DOI:10.1039/d0sc06096h
日期:——
The development of earth-abundant photoredox catalysts remains a challenge. Studies of Ni- and Zn-Mabiq complexes demonstrate how the coordinating metal ion influences the photochemistry, photodynamics and reactivity of photocatalysts.
Redox and photocatalytic properties of a Ni<sup>II</sup> complex with a macrocyclic biquinazoline (Mabiq) ligand
作者:Michael Grübel、Irene Bosque、Philipp J. Altmann、Thorsten Bach、Corinna R. Hess
DOI:10.1039/c7sc05320g
日期:——
reaction, the first-row transition metal compound is comparable if not superior to [Ru(bpy)3]2+ in terms of efficiency (turnover number) and chemoselectivity. Studies using a series of sacrificial donor amines indicate that the excited state redox potential of [Ni(Mabiq)]+* is ≥1.25 V vs. SCE. This value is similar to the excited state potential of commonly employed noble metal based photocatalysts. The Ni-Mabiq
[EN] POLYMERIC SYSTEMS CONTAINING CHROMOPHORIC UNITS FOR PHOTO-DRIVEN CATALYSIS AND WATER SPLITTING<br/>[FR] SYSTÈMES POLYMÈRES CONTENANT DES MOTIFS CHROMOPHORES POUR PHOTOCATALYSE ET DISSOCIATION D'EAU
申请人:UNIV NORTH CAROLINA
公开号:WO2012103309A2
公开(公告)日:2012-08-02
A polymer (e.g., a photocatalytic polymer) that contains chromophoric units therein (e.g., covalently coupled therein, in the polymer backbones and/or side chains), is described. In some embodiments, the polymer comprises: (a) a first ligand as a first repeating monomeric unit therein (e.g., as part of the polymer backbones and/or side chains); (b) a transition metal (e.g., Ru, Ir, Fe, Co, etc.) complexed with said first ligand to form a chromophoric unit or transition metal photocatalyst therewith; and (c) optionally but preferably at least one additional ligand (e.g., one or two) complexed with said transition metal to form said chromophoric unit or transition metal photocatalyst; and (d) optionally but preferably a second monomeric unit copolymerized with said first monomeric unit. Compositions containing the same and methods of using the same are also described.
Heterogenization of [Ru(bpy)3]Cl2 on Ordered Mesoporous Silica Materials for Photocatalytic Applications
Herein, the preparation and characterization of three Ru-based heterogeneous photocatalysts supported on ordered mesoporous silica materials are reported. The photocatalytic activity of these catalysts was evaluated through oxidation, reduction, cycloaddition and carboxylation reactions and their efficiencies are comparable to the parent [Ru(bpy)3]Cl2 in homogeneous conditions. These photocatalysts are efficiently recovered even after five reactions cycles offering new opportunities in sustainable chemistry