Article
Chemistry, Physical
Matthew Nava, Agnes E. Thorarinsdottir, Nazario Lopez, Christopher C. Cummins, Daniel G. Nocera
Summary: Understanding the redox reactions and processes in metal-air and specifically lithium-air batteries, especially the chemistry of peroxide dianion O22-, is crucial for the advancement of this promising energy-storage technology. The electron transfer kinetics and redox reaction chemistry of isolated peroxide dianion encapsulated within a hexacarboxamide cryptand are reviewed. Further research on the electron transfer properties and the chemical reactions of peroxide dianion will contribute to the development of rechargeable lithium-air batteries.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jie Yang, Yukun Zhao, Mengyu Duan, Chaoyuan Deng, Yufan Zhang, Yu Lei, Jikun Li, Wenjing Song, Chuncheng Chen, Jincai Zhao
Summary: In this study, the efficient dioxygenation of alkenes to diols or alpha-hydroxy ketones under mild conditions was achieved by adding bicarbonate in a heterogenous photoelectrochemical cell. The role of bicarbonate-derived radicals in the reaction was identified and a triple role mechanism was proposed.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Renli Chen, Shenlong Jiang, Qun Zhang, Yi Luo
Summary: A mechanistic study of a PTCDA2-/TiO2 dye-sensitized photocatalytic system reveals a vibrationally excited-state-selective, visible-light photo-catalytic hydrogen evolution reaction. An intermediate complex (IC) state with a lifetime of about 12 ps mediates the interfacial electron transfer (IET) channel from a specific excited state of PTCDA2- to the conduction band continuum of TiO2.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Applied
Natalia Llopis, Patricia Gisbert, Alejandro Baeza
Summary: The use of HFIP solvent in the oxidative cleavage of indoles results in higher yields of 2-ketoacetanilides, and it is also suitable for oxidation of various pyrroles and furans derivatives. The sustainable and practical nature of HFIP is demonstrated by its successful recycling up to 4 cycles in larger-scale reactions.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Alexander V. Smolin, Mikhail N. Mikhailov, Aleksey F. Gadzaov, Leonid M. Kustov
Summary: This study examines the correlation of rCO2 oxidation on polycrystalline Pt in H2CO3, identifying the mechanisms of the reaction using quantum chemical and DFT calculations. The energy parameters of rCO2 oxidation under open-circuit and electrochemical conditions show correspondence, indicating the stability of certain systems based on Pt-13.
Article
Cell Biology
Wenping Xiang, Zhigang Yang, Hui Xue, Jingbo Wang, Fanyan Niu, Jie Wang, Chao Chen, Yaming Wang, Jiangxia Pang, Baojun Wang
Summary: The study demonstrated that microglia activation regulated by ATP through the P2Y12 receptor pathway may be closely related to the development of delayed encephalopathy after acute carbon monoxide poisoning. The results also showed that the use of a P2Y12 receptor antagonist could alleviate the symptoms associated with the condition.
Article
Chemistry, Applied
Natalia Llopis, Patricia Gisbert, Alejandro Baeza, Jara Correa-Campillo
Summary: This study describes the oxidative dehydrogenation of N-heterocyclic compounds using H2O2 as an oxidant in combination with polar solvents such as 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) and H2O. The best yields for heteroaromatic compounds were generally achieved in HFIP, but it is surprising that using a non-toxic solvent like H2O also gave good yields. Additionally, this method can be implemented on a larger scale and the HFIP solvent can be reused.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Sotirios Mavrikis, Maximilian Goeltz, Stefan Rosiwal, Ling Wang, Carlos Ponce de Leon
Summary: This study explores the impact of potassium carbonate electrolytes and their key properties on H2O2 production, and finds that CO32- plays an important role in the electrochemical generation of H2O2 through 2e(-) WOR. Utilizing boron-doped diamond material, efficient H2O2 production can be achieved in highly concentrated K2CO3 solutions.
Article
Chemistry, Multidisciplinary
K. Yuvaraj, Jeremy C. Mullins, Thayalan Rajeshkumar, Iskander Douair, Laurent Maron, Cameron Jones
Summary: Reactions of a dimagnesium(i) compound with simple Lewis bases and CO led to the reductive tetramerisation of the diatomic molecule. The competition between the formation of magnesium squarate and magnesium metallo-ketene products was observed at room temperature. The selective formation of magnesium squarate was achieved at elevated temperature.
Article
Chemistry, Applied
Shaohua Xie, Xing Zhang, Peng Xu, Braden Hatcher, Yuxi Liu, Lu Ma, Steven N. Ehrlich, Sampyo Hong, Fudong Liu
Summary: With ideal metal utilization efficiency and homogeneous active sites, single atom catalysts (SACs) have attracted extensive attention in heterogeneous catalysis field. In this study, the surface acidity of Pt SACs was tuned through modification with acidic WO3 and basic MgO. It was found that WO3 modified Pt/Al2O3 showed superior activity in methanol decomposition, while MgO modified Pt/Al2O3 performed better in CO oxidation under the reaction condition with H2O.
Article
Microbiology
Caitlin K. Wilson, Gary M. King
Summary: The study suggests that temporary, periodic exposure to permissive growth temperatures could help maintain populations of thermophiles in mesothermal habitats after deposition from the atmosphere or other sources. The different thermophiles tested in the study showed varying responses to temperature fluctuations, with some being able to grow and oxidize CO under different conditions, while others were limited to specific temperature ranges.
Article
Chemistry, Applied
J. Carbajo, A. Quintanilla, A. L. Garcia-Costa, J. Gonzalez-Julian, M. Belmonte, P. Miranzo, M. Osendi, J. A. Casas
Summary: The study showed that the formation of carbon monoxide in the Catalytic Wet Peroxide Oxidation process is significantly lower compared to the conventional Fenton process. Different solid catalysts can achieve a more gradual oxidation of phenol and aromatic intermediates, resulting in lower CO emissions.
Article
Chemistry, Multidisciplinary
Xiongfei Zheng, Ili Zulkifly, Andreas Heilmann, Caitilin McManus, Simon Aldridge
Summary: Two BNB-type frustrated Lewis pairs with different B-bound fluoroaryl groups are capable of capturing gaseous CO reversibly at/above room temperature, with migration of an aryl substituent to the electrophilic carbon of the CO guest. This reversibility allows for release of captured carbon monoxide in the temperature range 40-70 degrees C, enabling potential CO sensing based on color changes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Tsz-Kan Ma, Diyuan Li, Jonathan D. Wilden
Summary: Mechanistic studies of a reactive oxygen species mediated electrochemical radical reaction of alkyl iodides are described. Hydroxyl radicals and ozone are identified as the active species involved in the formation of alkyl radicals under mildly reducing potential (-1.0 V vs. Ag QRE) in buffered acidic conditions (pH 3.6).
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Roberto Camposeco, Salvador Castillo, Rodolfo Zanella
Summary: The catalytic oxidation of C3H8 and CO by Pd nanoparticles supported on MnOx/TiO2 synthesized by the sol-gel method was investigated. The results showed a strong interaction between Pd and MnOx/TiO2, and the annealing temperature of the TiO2 support influenced the catalytic properties of the Pd-MnOx/TiO2 catalyst. The catalysts with 1 and 2 wt% of Pd loading supported on MnOx/TiO2 exhibited excellent catalytic activity for the oxidation of C3H8 and CO at different temperature intervals.
Article
Chemistry, Inorganic & Nuclear
Andre K. Eckhardt, Martin-Louis Y. Riu, Peter Muller, Christopher C. Cummins
Summary: In this study, further reactivity studies of the N(3)PA molecule were conducted, including strain-promoted 1,3-dipolar cycloaddition with cyclooctyne and Staudinger-type reactivity. The click reaction was found to be faster than the dissociation of N(3)PA. The Staudinger-type reactivity allowed transfer of the NPA fragment to a base-stabilized silylene.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Daniel M. Loh, Matthew Nava, Daniel G. Nocera
Summary: The use of conductive polypyrrole-silicon nanowire devices for intracellular delivery shows comparable kinetics to solution-based methods, but with significantly less cargo loading required. This hybrid polymer-semiconductor platform extends existing intracellular delivery methods and connects electrical signaling from artificial systems to biological molecular transduction.
Article
Chemistry, Multidisciplinary
Feng Zhai, Tiansi Xin, Michael B. Geeson, Christopher C. Cummins
Summary: In this study, a sustainable method for the production of phosphite was reported using condensed phosphates as catalysts and hydride reagents. The method offers a more sustainable approach to accessing reduced phosphorus compounds and provides a means to close the modern phosphorus cycle.
ACS CENTRAL SCIENCE
(2022)
Article
Chemistry, Physical
Matthew Nava, Agnes E. Thorarinsdottir, Nazario Lopez, Christopher C. Cummins, Daniel G. Nocera
Summary: Understanding the redox reactions and processes in metal-air and specifically lithium-air batteries, especially the chemistry of peroxide dianion O22-, is crucial for the advancement of this promising energy-storage technology. The electron transfer kinetics and redox reaction chemistry of isolated peroxide dianion encapsulated within a hexacarboxamide cryptand are reviewed. Further research on the electron transfer properties and the chemical reactions of peroxide dianion will contribute to the development of rechargeable lithium-air batteries.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Tomoaki Sakurada, Yeongsu Cho, Watcharaphol Paritmongkol, Woo Seok Lee, Ruomeng Wan, Annlin Su, Wenbi Shcherbakov-Wu, Peter Mueller, Heather J. Kulik, William A. Tisdale
Summary: This work reports a chemically robust yellow emissive one-dimensional (1D) semiconductor, silver 2,6-difluorophenylselenolate-AgSePhF2(2,6), which belongs to the class of hybrid low-dimensional semiconductors. Introduction of fluorine atoms at the (2,6) position of the phenyl ring induces a structural transition from 2D sheets to 1D chains. AgSePhF2(2,6) exhibits strongly dispersive conduction and valence bands along the 1D crystal axis. Visible photoluminescence with prompt and delayed components is observed at room temperature.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Kevin Qian, Scott M. Shepard, Tiansi Xin, Gyeongjin Park, Christopher C. Cummins
Summary: Commercial phosphorus pentoxide can react with certain N-donor bases to form adducts P2O5L2 and P4O10L3 (L = DABCO, pyridine, 4-tert-butylpyridine). The DABCO adducts were characterized using single-crystal X-ray diffraction. It is proposed that interconversion between P2O5L2 and P4O10L3 occurs through a phosphate-walk mechanism, which was evaluated using DFT calculations. P2O5(pyridine)2 can efficiently transfer monomeric diphosphorus pentoxide to phosphorus oxyanion nucleophiles, resulting in substituted trimetaphosphates and cyclo-phosphonate-diphosphates (P3O8R)2- (R1 = nucleosidyl, phosphoryl, alkyl, aryl, vinyl, alkynyl, H, F). Hydrolytic ring-opening of these compounds produces linear derivatives [R1(PO3)2PO3H]3- , and nucleophilic ring-opening yields linear disubstituted [R1(PO3)2PO2R2]3- compounds.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Taryn D. Palluccio, Meaghan E. Germain, Marco Marazzi, Manuel Temprado, Jared S. Silvia, Peter Mueller, Christopher C. Cummins, Jack V. Davis, Leonardo F. Serafim, Burjor Captain, Carl D. Hoff, Elena V. Rybak-Akimova
Summary: This study describes the synthesis and structures of nitrile complexes of V (N[(t) Bu] Ar) (3), 2 (Ar = 3,5-Me2C6H3). The thermochemical and kinetic data for their formation were determined using various techniques. The extent of back-bonding from metal to coordinated nitrile reveals a different role of electron donation compared to the related complex Mo (N[(t) Bu] Ar) (3), 1. Kinetic studies show similar rate constants for nitrile binding to 2, but the activation parameters depend on the nature of R in RCN. Density functional theory (DFT) calculations support the formation of a π-stacking interaction between a pendant arene of the metal anilide and the arene substituent on the incoming nitrile in favorable cases.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Tiansi Xin, Christopher C. Cummins
Summary: Solvent-free mechanochemical phosphorylation of acetylides using condensed phosphates provides a more sustainable method for synthesizing alkynyl phosphonates and organophosphorus chemicals.
ACS CENTRAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Gregory D. Thiabaud, Miriam Schwalm, Sajal Sen, Ali Barandov, Jacob Simon, Peter Harvey, Virginia Spanoudaki, Peter Muller, Jonathan L. Sessler, Alan Jasanoff
Summary: This study successfully synthesized a molecular probe that allows assessment of intracellular calcium levels through fluorescence, photoacoustic, and magnetic resonance imaging techniques, which can be detected in brain tissue.
Article
Chemistry, Multidisciplinary
Tiansi Xin, Christopher C. Cummins
Summary: This study reports the synthesis and structural characterization of free, uncomplexed phosphet-2-ones for the first time. Unsaturated four-membered phosphacycles were prepared by phosphinidene transfer from dibenzo-7-phosphanorbornadiene compounds to cyclopropenones. The reaction is proposed to proceed through ketene-ylide and ketene-phosphaalkene intermediates. Further transformations of the phosphet-2-ones yielded more phosphet-2-ones and 1,2-dihydrophosphetes, including two furanone derivatives which are postulated to be produced by intramolecular phosphine-catalyzed [3 + 2] annulations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Keita Tanaka, Martin-Louis Y. Riu, Brian Valladares, Christopher C. Cummins
Summary: In this study, a new class of Azophosphines and N-heterocyclic iminophosphoranes (NHIPs) were successfully synthesized. The NHIPs exhibited tunability of steric demands and good basicity. The facile and scalable synthesis of NHIPs suggests their potential applications in synthetic chemistry.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Tiansi Xin, Michael B. Geeson, Hui Zhu, Zheng-Wang Qu, Stefan Grimme, Christopher C. Cummins
Summary: The structural characterization and scalable preparation of iron-phosphido complex FpP(Bu-t)(F) and its precursor FpP(Bu-t)(Cl) are reported, along with their relevance in organoiron catalytic cycle. The discovery of a more efficient catalytic system and successful synthesis of phosphirane compounds are also discussed.
Article
Materials Science, Multidisciplinary
William J. Mullin, Peter Mueller, Anthony J. Schaefer, Elisa Guzman, Steven E. Wheeler, Samuel W. Thomas
Summary: This study investigates the stacking interactions between aromatic rings and heterocycles, revealing that fluorinated side-chains and electron-rich units have interactions in the solid state, while electron-deficient units are incompatible. These interactions play a significant role in compound stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)