scholarly journals Controlling the Optical and Catalytic Properties of Artificial Metalloenzyme Photocatalysts Using Chemogenetic Engineering

2022 ◽  
Author(s):  
Yasmine S Zubi ◽  
Bingqing Liu ◽  
Yifan Gu ◽  
Dipankar Sahoo ◽  
Jared C Lewis

Visible light photocatalysis enables a broad range of organic transformations that proceed via single electron or energy transfer. Metal polypyridyl complexes are among the most commonly employed visible light photocatalysts....

2021 ◽  
Author(s):  
Yasmine S. Zubi ◽  
Bingqing Liu ◽  
Yifan Gu ◽  
Dipankar Sahoo ◽  
Jared Lewis

Visible light photocatalysis enables a broad range of organic transformations that proceed via single electron or energy transfer. Metal polypyridyl complexes are among the most commonly employed visible light photocatalysts. The photophysical properties of these complexes have been extensively studied and can be tuned by modifying the substituents on the pyridine ligands. On the other hand, ligand modifications that enable substrate binding to control reaction selectivity remain rare. Given the exquisite control that enzymes exert over electron and energy transfer processes in nature, we envisioned that artificial metalloenzymes (ArMs) created by incorporating Ru(II) polypyridyl complexes into a suitable protein scaffold could provide a means to control photocatalyst properties. This study describes approaches to create covalent and non-covalent ArMs from a variety of Ru(II) polypyridyl cofactors and a prolyl oligopeptidase scaffold. A panel of ArMs with enhanced photophysical properties were engineered, and the nature of the scaffold/cofactor interactions in these systems was investigated. These ArMs provided higher yields and rates than Ru(Bpy)32+ for the reductive cyclization of dienones and the [2+2] photocycloaddition between C-cinnamoyl imidazole and 4-methoxystyrene, suggesting that protein scaffolds could provide a means to improve the efficiency of visible light photocatalysts.


2020 ◽  
Vol 07 ◽  
Author(s):  
Avik K. Bagdi ◽  
Papiya Sikdar

Abstract:: Organic synthesis under environment friendly conditions has great impact in the sustainable development. In this context, visible light photocatalysis has emerged as a green model as this offers an energy-efficient pathway towards the organic transformation. Different transition-metal catalysts (Ir-, Ru-, Cu- etc) and organic dyes (eosin Y, rose bengal, methylene blue etc) are well-known photocatalysts in organic synthesis. Apart from the well-known organophotoredox catalysts, rhodamines (Rhodamine B and Rhodamine 6G) have been also employed as efficient photocatalysts for different organic transformations. In this review, we will focus on the photocatalysis by rhodamines in organic synthesis. Mechanistic pathway of the methodologies will also be discussed. We believe this review will stimulate the employment of rhodamines in the visible light photocatalysis for efficient organic transformations in the future.


2018 ◽  
Vol 54 (96) ◽  
pp. 13587-13590 ◽  
Author(s):  
Yuxing Huang ◽  
Zhuo Xin ◽  
Wenlong Yao ◽  
Qi Hu ◽  
Zhuohua Li ◽  
...  

A novel recyclable composite catalyst (Fe3O4-RB/LDH) formed by stable self-assembly of Fe3O4 NPs, rose bengal, and layered double hydroxides can catalyze various organic transformations with high efficiency in water under visible light irradiation.


2014 ◽  
Vol 43 (1) ◽  
pp. 473-486 ◽  
Author(s):  
Xianjun Lang ◽  
Xiaodong Chen ◽  
Jincai Zhao

2015 ◽  
Vol 6 (10) ◽  
pp. 5366-5382 ◽  
Author(s):  
Guillaume Duret ◽  
Robert Quinlan ◽  
Philippe Bisseret ◽  
Nicolas Blanchard

Activation of stable boron species with visible-light allows the creation of boryl and/or carbon radicals through single electron- or energy transfer.


2020 ◽  
Vol 49 (4) ◽  
pp. 1032-1047 ◽  
Author(s):  
Sherif Okeil ◽  
Sandeep Yadav ◽  
Michael Bruns ◽  
Alexander Zintler ◽  
Leopoldo Molina-Luna ◽  
...  

Titanium chalcogenides are valuable candidates for visible light photocatalysis at high efficiency levels. TiS2/TiO2 core shell heterostructures are able to increase this efficiency by an effective quenching of the exiton recombination.


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