Article
Chemistry, Multidisciplinary
Jovan San Martin, Nhu Dang, Emily Raulerson, Matthew C. Beard, Joseph Hartenberger, Yong Yan
Summary: It has been found that metal-halide perovskites used as photocatalysts for CO2 reduction in organic solvents may face issues due to photoredox organic transformations involving the solvent, resulting in CO production rather than CO2 reduction products. The rate of CO generation in organic solvents can be orders of magnitude higher than typical CO2 reduction pathways.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Organic
Kenta Tanaka, Mami Kishimoto, Yuta Tanaka, Yusuke Kamiyama, Yosuke Asada, Mayumi Sukekawa, Naoya Ohtsuka, Toshiyasu Suzuki, Norie Momiyama, Kiyoshi Honda, Yujiro Hoshino
Summary: New moderately oxidizing thioxanthylium photoredox catalysts have been developed that can efficiently promote radical-cation Diels-Alder reactions under green light irradiation. These catalysts have relatively moderate excited-state reduction potentials and can tolerate beta-halogenostyrenes, producing synthetically useful halocyclohexenes.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Yasuomi Yamazaki, Masahiko Miyaji, Osamu Ishitani
Summary: This article summarizes the catalytic systems used for the reduction of low-concentration CO2, including the process of CO2 insertion into catalysts and the application of reaction media.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yuezhi Mao, Matthias Loipersberger, Kareesa J. Kron, Jeffrey S. Derrick, Christopher J. Chang, Shaama Mallikarjun Sharada, Martin Head-Gordon
Summary: ALMO-EDA(solv) is a computational method that allows for the study of intermolecular interactions in solution by incorporating solvent effects. By applying this method to model complexes related to CO2 reduction catalysis, it was shown that substituents can have significant impacts on the stability of molecular structures. This extension of ALMO-EDA provides a valuable tool for understanding intermolecular interactions and their effects on chemical reactivity in solution.
Article
Chemistry, Multidisciplinary
Kaeden Teindl, Brian O. O. Patrick, Eva M. M. Nichols
Summary: This study investigates the contribution of proton transfer driving forces in molecular catalysts for electrochemical CO2 reduction. By synthesizing a series of catalysts with tunable pK(a) and varying acidity of exogenous acids, it is found that the kinetics of catalytic turnover are more sensitive to variations in SCS pK(a) when using more acidic exogenous acids and to variations in exogenous acid pK(a) when SCS acidity is increased.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Jing Du, Yuan-Yuan Ma, Wen-Jing Cui, Si -Meng Zhang, Zhan-Gang Han, Run-Han Li, Xing-Qi Han, Wei Guan, Yong-Hui Wang, Ying-Qi Li, Yang Liu, Fei-Yang Yu, Kai-Qiang Wei, Hua-Qiao Tan, Zhen-Hui Kang, Yang-Guang Li
Summary: In this study, the electron-transfer mechanism in heterogeneous photocatalytic CO2 reduction reaction was investigated using a new type of metal-organic framework as model photocatalysts. The results revealed the significant regulation role of different polyoxometalate units on electron transfer and photocatalytic activities.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Meng-Ting Ming, Yu-Chen Wang, Wei-Xue Tao, Wen-Jie Shi, Di-Chang Zhong, Tong-Bu Lu
Summary: Unlocking the potential of sustainable fuel production through the development of highly efficient CO2 reduction catalysts under visible light irradiation remains an ongoing challenge. Herein, a strategically designed Zr-based metal-organic framework (MOF) photocatalyst, incorporating binuclear cobalt complexes as catalytic sites, achieved an impressive CO yield, outperforming its mononuclear counterpart and showcasing exceptional catalytic capabilities. Experimental findings and Density Functional Theory (DFT) calculations revealed the synergistic catalytic effect between the two Co sites and the heightened light absorption attributed to the incorporation of the amino group. By offering a bioinspired approach to designing efficient dual-atom MOF photocatalysts for CO2 reduction, this study has significant implications for the future of sustainable energy production.
Article
Chemistry, Multidisciplinary
Siyuan Chen, Fucheng Yang, Hongyi Gao, Junyong Wang, Xiao Chen, Xiaowei Zhang, Jie Li, Ang Li
Summary: In this study, Zn(II) porphyrin was used to coordinate with titanium oxo clusters to enhance the photoelectric conversion ability and CO2 adsorption capacity of NH2-MIL125(Ti), leading to an 11-fold increase in CO2/CO conversion efficiency.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Chemistry, Organic
Dong Yeun Jeong, Youngmin You
Summary: This paper explores the effectiveness of organic photoredox catalysts with long excited-state lifetimes as promising alternatives to transition-metal-complex photocatalysts. It focuses on the structures and photophysics enabling such long lifetimes, comparing them with typical Ir(III) and Ru(II) based catalysts. Recent demonstrations of the synthetic utility of these organic catalysts are also provided.
Article
Chemistry, Physical
Xifeng Luo, Ran Jiang, Ziang Ma, Tiantian Yang, Hui Liu, Hui Deng, Wenhong Wu, Cunku Dong, Xi-Wen Du
Summary: This study elucidated the effect of Ag's work function on the electrochemical reduction of CO2 to CO by controlling the ratio of exposed crystalline planes. It was found that a higher proportion of Ag(110) to Ag(100) leads to a lower work function, resulting in enhanced electrochemical activity and selectivity for CO production. This research demonstrates a promising strategy to improve the electrochemical performance of metal catalysts by tuning their work functions through regulating exposed crystalline planes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Lin Chen, Quan Qu, Chuan-Kun Ran, Wei Wang, Wei Zhang, Yi He, Li-Li Liao, Jian-Heng Ye, Da-Gang Yu
Summary: We report a novel visible-light photocatalytic carboxylation of C-N bonds in cyclic amines with CO2 via consecutive photo-induced electron transfer (ConPET). It is the first photocatalytic reductive ring-opening reaction of azetidines, pyrrolidines, and piperidines. This strategy enables the transformation of easily available cyclic amines into valuable amino acids in moderate-to-excellent yields. The method features mild and transition-metal-free conditions, high selectivity, good functional-group tolerance, facile scalability, and product derivations. Mechanistic studies suggest that ConPET plays a key role in generating highly reactive photocatalysts for the reductive activation of cyclic amines.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Joseph M. Edgecomb, Sara N. Alektiar, Nicholas G. W. Cowper, Jennifer A. Sowin, Zachary K. Wickens
Summary: We report a new class of electrophotocatalysts, polycyclic aromatic hydrocarbons, which can promote the reduction of unactivated carbonyl compounds and generate versatile ketyl radical intermediates. This catalytic platform enables challenging intermolecular ketyl radical coupling reactions, including those that classic reductants have failed to promote. The study provides an approach to expand the array of reactive radical intermediates generated via electrophotocatalysis.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Ali Molaei Aghdam, Kamran Valizadeh, Amir Bateni, Nazanin Sojoodi, Mehdi Shaeban Jahanian, Anjan Kumar, Jinlian Giao
Summary: In this study, the CO2 reduction mechanisms on Cu-CNT(8, 0) and V-C-52 as catalysts were investigated, revealing key steps and parameters involved in the process.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Environmental Sciences
Yang Yu, Chang Liu, Shaojia Gu, Yuhui Wei, Lei Li, Qing Qu
Summary: Upgrading and recycling spent catalysts into high-perform bio-catalysts can address palladium resource shortages and environmental problems. By using Escherichia coli as an electron transfer intermediate, the recovery efficiency of palladium exceeded 98.6%.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Multidisciplinary
Wenkai Xu, Gui-Rong Zhang, Jiansong Wang, Hui Yu, Weiwei Zhang, Liu-Liu Shen, Donghai Mei
Summary: Efficient electron transfer from photosensitizer to catalytic sites is crucial for effective artificial photosynthesis. In this study, it was found that simple fluorination of the organic linkers in the MIL-101(Fe) photocatalyst significantly increased the photocatalytic CO2-to-CO conversion rate. The fluorinated linkers enhanced the interaction between the photocatalyst and photosensitizer via hydrogen bonding, facilitating their intermolecular electron transfer. This strategy can also be applied to other Fe-based metal-organic frameworks photocatalysts.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Selin Bac, Megan E. Fieser, Shaama Mallikarjun Sharada
Summary: This study investigates the catalytic cycle and turnover frequencies for C(sp(3))-Cl activation and dechlorination by Rh(i) complexes, using density functional theory and the energetic span model. The results show that NaH has a significantly higher turnover frequency than NaHCO2, suggesting its potential as a promising salt for alkylchloride dechlorination with Rh(i) complexes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Selin Bac, Shaama Mallikarjun Sharada
Summary: This study used density functional theory and the energetic span model to investigate the activity of atomically dispersed Pt on rutile TiO2 (110) towards low-temperature CO oxidation. The highest TOF pathway, the TER mechanism, was ruled out due to Pt's instability in an intermediate state when bound to two CO molecules. Overall, it was concluded that H1 exhibits little activity towards CO oxidation.
Article
Chemistry, Physical
Selin Bac, Stephen Jon Quiton, Kareesa J. Kron, Jeongmin Chae, Urbashi Mitra, Shaama Mallikarjun Sharada
Summary: This work examines the viability of matrix completion methods as cost-effective alternatives to full nuclear Hessians for calculating quantum and variational effects in chemical reactions. The study finds that the harmonic variety-based matrix completion algorithm demonstrates robustness in chemical reactions and accurately recovers key observables.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Kareesa J. Kron, Andres Rodriguez-Katakura, Pranesh Regu, Maria N. Reed, Rachelle Elhessen, Shaama Mallikarjun Sharada
Summary: This work utilizes a genetic algorithm to discover organic catalysts for photoredox CO2 reduction with high activity and resistance to degradation. The algorithm combines activity and degradation descriptors to construct the fitness function and evaluates its performance based on electron transfer barriers. The majority of predicted catalysts show improved performance compared to experimental ones. This study recommends 25 catalysts for further experimental investigation.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Kareesa J. Kron, Jonathan Ryan Hunt, Jahan M. Dawlaty, Shaama Mallikarjun Sharada
Summary: Interactions between excited-state arenes and amines can lead to the formation of structures with distinct emission behavior. A computational protocol is established to calculate and validate these excited-state complexes, and fluorescence spectroscopy is used for experimental verification. The results show that charge transfer interactions play a predominant role in the emissions, and solvent dielectric strongly affects the emission frequency but not the extent of charge separation.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Physical
Stephen Jon Quiton, Jeongmin Chae, Selin Bac, Kareesa Kron, Urbashi Mitra, Shaama Mallikarjun Sharada
Summary: This paper presents the development of a novel matrix completion algorithm that reduces computational effort in reaction rate coefficient calculations and demonstrates high predictive accuracy in various types of reactions.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Chemistry, Physical
Selin Bac, Abhilash Patra, Kareesa J. Kron, Shaama Mallikarjun Sharada
Summary: This paper provides an overview of state-of-the-art techniques for efficiently calculating second and higher nuclear derivatives of quantum mechanical energy. Machine learning, automatic differentiation, and matrix completion are emerging methods that show promise in overcoming the challenges of high costs and memory for such calculations. These methods enable reliable predictions of quantum mechanical energy responses to nuclear perturbations.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Physical
Zhenzhuo Lan, Jacob Toney, Shaama Mallikarjun Sharada
Summary: This study computationally investigates the mechanism and active site identification of methane hydroxylation by monocopper complexes. The results suggest that the oxyl species is the likely active site, and spin crossing may provide a lower energy pathway for hydroxylation.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Correction
Chemistry, Physical
Kareesa J. Kron, Jonathan Ryan Hunt, Jahan M. Dawlaty, Shaama Mallikarjun Sharada
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Berk Delibas, Kareesa J. Kron, Daniel E. Cotton, Noemi Salazar, Shaama Mallikarjun Sharada, Jahan M. Dawlaty
Summary: Through IR spectroscopy, we discovered that a characteristic frequency varies with the Hammett parameter of substituents in the reaction of amines with CO2 to form carbamate bonds. Computational evidence shows that the vibrational frequency of the adducted CO2 can predict the energy of carbamate formation. Our work is significant in the field of CO2 capture research, as spectroscopic observables, such as IR frequencies, can serve as descriptors of driving forces.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Nancy G. Bush, Mikiyas K. Assefa, Selin Bac, Shaama Mallikarjun Sharada, Megan E. Fieser
Summary: In the presence of (xantphos)RhCl catalyst, reaction of poly(vinyl chloride) (PVC) with triethyl silane in THF leads to partial reduction of PVC via hydrodechlorination. Increasing catalyst loading or using N,N-dimethylacetamide (DMA) as a solvent decreases the selectivity for hydrodechlorination. Reaction of PVC with sodium formate in THF affords excellent selectivity for hydrodechlorination along with complete PVC dechlorination, while higher catalyst loadings are required. In contrast, reaction of PVC with NaH in DMA exhibits good selectivity for dehydrochlorination and higher reaction rates.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Kristopher M. Koskela, Stephen J. Quiton, Shaama Mallikarjun Sharada, Travis J. Williams, Richard L. Brutchey
Summary: This study demonstrates the facile dissolution of zinc oxide using a binary alkahest system. The dissolution mechanism involves the binding of thiols to the zinc oxide surface, followed by the addition of other ligands and cleavage of the zinc complex. The insights gained from this study can inform the dissolution of other bulk oxides into inks for solution processed thin films.