4.7 Article

A hydrogen-atom transfer mechanism in the oxidation of alcohols by [FeO4]2- in aqueous solution

Journal

DALTON TRANSACTIONS
Volume 47, Issue 1, Pages 240-245

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt03830e

Keywords

-

Funding

  1. Hong Kong University Grants Committee Areas of Excellence Scheme [AoE/P-03/08]
  2. Research Grants Council of Hong Kong [CityU 101713, 11301514]

Ask authors/readers for more resources

The ferrate(VI) ion, [FeO4](2-), has attracted much interest in recent years because of its potential use as a green oxidant in organic synthesis and water treatment. Although there have been several reports on the use of ferrate(VI) for the oxidation of alcohols to the corresponding carbonyl compounds, the mechanism remains unclear. In this work, the kinetics of the oxidation of a series of alcohols with alpha-C-H bond dissociation energies ranging from 81 to 95 kcal mol(-1) have been studied by UV/Vis spectrophotometry. The reactions are first-order in both [FeO4](2-) and [alcohol]. The deuterium isotope effects for the oxidation of methanol/d(4)-methanol, ethanol/d(6)-ethanol and benzyl alcohol/d(7)-benzyl alcohol are 18.0 +/- 0.1, 4.1 +/- 0.1 and 11.2 +/- 0.1, respectively. A linear correlation is found between the second-order rate constants and the alpha-C-H bond dissociation energies (BDEs) of the alcohols, consistent with a hydrogen atom transfer (HAT) mechanism. The proposed HAT mechanism is supported by DFT calculations.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

Article Chemistry, Multidisciplinary

(Salen)osmium(VI) nitrides catalyzed glutathione depletion in chemotherapy

Wanqiong Huang, Chen Pan, Yongliang Huang, Tao Huang, Xiaonan Dong, Yunzhou Chen, Huatian Shi, Taichu Lau, Wailun Man, Wenxiu Ni

Summary: Glutathione depletion is a promising strategy for the development of non-platinum anticancer drugs. This study introduces a series of electrophilic (salen)osmium(VI) nitrides that react with glutathione to produce (salen)osmium(III) ammine compounds. In vitro experiments show that these osmium(VI) nitrides exhibit similar cytotoxicity to cisplatin against various types of carcinoma. Mechanistic studies suggest that one representative compound (1) induces glutathione depletion, reactive oxygen species generation, endoplasmic reticulum stress, and ultimately leads to death receptor-mediated apoptosis and autophagy in lung cancer cells. In vivo evaluations demonstrate that 1 effectively inhibits tumor xenograft growth without causing weight loss.

CHINESE CHEMICAL LETTERS (2023)

Article Chemistry, Inorganic & Nuclear

Ring Nitrogenation of Aromatic Amines by the Excited State of an Osmium(VI) Nitrido Complex

Lu-Lu Liu, Li-Xin Wang, Min Peng, Jing Xiang, Huan Yang, Shek-Man Yiu, Tai-Chu Lau

Summary: The reactivity of electrophilic OsVI and RuVI nitrides with amines has been reported before. In this study, a luminescent osmium(VI) nitrido complex was found to undergo ring nitrogenation of aromatic amines under visible light irradiation. The reaction proceeds through nucleophilic addition of the amine nitrogen to the excited state complex. The products were characterized using spectroscopic techniques and X-ray crystallography. The reaction mechanism involves electron transfer and proton transfer steps.

INORGANIC CHEMISTRY (2023)

Article Chemistry, Multidisciplinary

In situ Electropolymerized 3D Microporous Cobalt-Porphyrin Nanofilm for Highly Effective Molecular Electrocatalytic Reduction of Carbon Dioxide

Chao Wang, Yuzhuo Chen, Daijian Su, Wai-Lun Man, Kai-Chung Lau, Lianhuan Han, Liubin Zhao, Dongping Zhan, Xunjin Zhu

Summary: A new molecular electrocatalyst with highly dispersed CoN4 sites was synthesized for CO2 reduction reaction. The catalyst shortens the electron transfer pathway, accelerates the redox kinetics, and improves durability. Experimental results showed that it achieved high current density and CO conversion rate in commercial flow cells.

ADVANCED MATERIALS (2023)

Article Chemistry, Inorganic & Nuclear

Structure and Reactivity of a Seven-Coordinate Ruthenium Iodosylbenzene Complex

Yunling Pan, Miaomiao Zhou, Rui Wang, Dan Song, Shek-Man Yiu, Jianhui Xie, Kai-Chung Lau, Tai-Chu Lau, Yingying Liu

Summary: In this study, a new type of seven-coordinate ruthenium-iodosylbenzene complex was reported, which exhibited high reactivity towards various organic substrates through undergoing O-atom transfer and C-H bond activation reactions. The X-ray crystal structure of this complex revealed a distorted pentagonal bipyramidal geometry. This work provides insights for the development of new highly reactive oxidizing agents based on seven-coordinate geometry.

INORGANIC CHEMISTRY (2023)

Article Chemistry, Multidisciplinary

Visible Light-Induced Oxidation of Alcohols by a Luminescent Osmium(VI) Nitrido Complex: Evidence for the Generation of PhIO plus as a Highly Active Oxidant in the Presence of PhIO

Jing Xiang, Yi Pan, Lu-Lu Liu, Li-Xin Wang, Huan Yang, Shun-Cheung Cheng, Shek-Man Yiu, Chi-Fai Leung, Chi-Chiu Ko, Kai-Chung Lau, Tai-Chu Lau

Summary: Although the oxidation of alcohols by metal nitrido complexes has not been studied extensively, this report demonstrates the visible-light-induced oxidation of primary and secondary alcohols to carbonyl compounds using a strongly luminescent osmium(VI) nitrido complex (OsN). The proposed mechanism involves the rate-limiting hydrogen-atom transfer from the alpha-carbon of the alcohol to OsN*. Attempts to catalytically oxidize alcohols by OsN* using PhIO as the terminal oxidant resulted in the formation of novel osmium(IV) iminato complexes where the nitrido ligand is bonded to a 6-carbon of the alcohol. Experimental and theoretical studies suggest that OsN* is reductively quenched by PhIO to generate highly active PhIO+ oxidant, which readily undergoes alpha- and 6- C-H activation of alcohols.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2023)

Article Chemistry, Physical

Light-Driven Reduction of CO2 to CO in Water with a Cobalt Molecular Catalyst and an Organic Sensitizer

Pui-Yu Ho, Shun-Cheung Cheng, Fei Yu, Yau-Yuen Yeung, Wen-Xiu Ni, Chi-Chiu Ko, Chi-Fai Leung, Tai-Chu Lau, Marc Robert

Summary: We present an efficient visible light-driven CO2 reduction system that operates in water without the use of noble metals or rare materials. By employing a cobalt complex as a catalyst, an organic triazatriangulenium salt as a photosensitizer, and BIH + TEOA as a sacrificial reductant, we achieved CO and formate production with high selectivity and total turnover numbers exceeding 3700. The addition of a weak Brönsted acid further improved the catalysis, resulting in a selectivity of 93% and a total turnover number of 19,000 for CO production. The photocatalytic system demonstrated excellent performance even in pure water, with a turnover number of 2600 and a selectivity of 94% using TEA as the sacrificial reductant.

ACS CATALYSIS (2023)

Article Chemistry, Multidisciplinary

Blue Electrophosphorescence from Iridium(III) Phosphors Bearing Asymmetric Di-N-aryl 6-(trifluoromethyl)-2H-imidazo[4,5-b]pyridin-2-ylidene Chelates

Jie Yan, Zi-Qi Feng, Yixin Wu, Dong-Ying Zhou, Shek-Man Yiu, Chin-Yiu Chan, Yi Pan, Kai Chung Lau, Liang-Sheng Liao, Yun Chi

Summary: Efficient blue phosphors for OLEDs remain challenging. Researchers have synthesized a series of Ir(III) complexes and studied their structures and photophysical properties to overcome this challenge. Some of the emitters can undergo interconversion without decomposition in a specific solvent. The synthesized Ir(III) complexes exhibit good luminescence properties and show potential for making blue OLEDs.

ADVANCED MATERIALS (2023)

Article Chemistry, Inorganic & Nuclear

Chalcogen atom abstraction from NCE- (E = O, S, Se) and i-Pr2S by the excited state of a luminescent tricyano osmium(vi) nitride

Li-Xin Wang, Miaomiao Zhou, Lu-Lu Liu, Jing Xiang, Ji-Yan Liu, Kai-Chung Lau, Tai-Chu Lau

Summary: Upon irradiation by blue LED (>460 nm), tricyano osmium nitrido complex [Os-VI(N)(L)(CN)(3)]- (OsN) can abstract chalcogen atoms from anions NCE- (E = O, S, Se) to form metal chalcogenonitrosyls [Os-II(NuE)(L)(CN)(3)]- (OsNE) and CN-. The photoreaction of OsN with organic sulfide, such as diisopropyl sulfide, also results in S atom abstraction and the formation of OsNS and Os-NvC(CH3)(2). The X-ray crystallographic study reveals the N-O, N-S, and N-Se bond distances of 1.206, 1.507, and 1.675 Å in (PPh4)[Os-II(NuE)(L)(CN)(3)].

INORGANIC CHEMISTRY FRONTIERS (2023)

Article Chemistry, Physical

Ferrocene/ferrocenium, cobaltocene/ cobaltocenium and nickelocene/nickelocenium: from gas phase ionization energy to one-electron reduction potential in solvated medium

Hongyan Zhao, Yi Pan, Kai-Chung Lau

Summary: This article proposes a theoretical procedure for accurately determining the reduction potentials of three metallocene couples. By calculating the gas phase ionization energy and the solvation free energy, the one-electron reduction potential is obtained. The SMD model yields the best estimation for the solvation free energy and provides reliable values for the reduction potentials.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2023)

Article Optics

Fragmentation dynamics of acetylene in collision with highly charged ions: Concerted and sequential breakage of CH and CC bonds

Yue Gao, Yi Pan, Shenyue Xu, Kai-Chung Lau, Hang Yuan, Zhenyu Yan, Dalong Guo, Dongmei Zhao, Xiaolong Zhu, Shuncheng Yan, Shaofeng Zhang, Zhongfeng Xu, Xinwen Ma

Summary: The three-body fragmentation of C2H23+ to H+ + C+ + CH+ resulting from CH and CC bond breaking is studied under 50-keV/u Ne8+ impact. All three fragments are detected in coincidence with a scattered projectile (either Ne7+ or Ne6+) using a reaction microscope, and their momentum vectors and kinetic energies are obtained. Four distinct structures are observed in the energy correlation spectra, indicating multiple fragmentation mechanisms contributing to the H+ + C+ + CH+ channel. Newton diagrams and Dalitz plots are used to trace these fragmentation mechanisms. It is found that both concerted fragmentation and sequential pathways involving CH bond breaking prior to CC contribute to this channel. The possible electronic states of the C2H23+ precursor that contribute to the identified fragmentation mechanisms are analyzed using quantum chemical calculations. Furthermore, the influence of collision dynamics between the projectile and target on the dissociation mechanisms is discussed by comparing the contributions from the T1I2 channel and the reversed T2I1 channel, where one electron is transferred while ionizing the other two. The T2I1 channel is observed to be more efficient in initiating fragmentation mechanisms with higher kinetic energy release.

PHYSICAL REVIEW A (2023)

Article Chemistry, Multidisciplinary

In situ Electropolymerized 3D Microporous Cobalt-Porphyrin Nanofilm for Highly Effective Molecular Electrocatalytic Reduction of Carbon Dioxide

Chao Wang, Yuzhuo Chen, Daijian Su, Wai-Lun Man, Kai-Chung Lau, Lianhuan Han, Liubin Zhao, Dongping Zhan, Xunjin Zhu

Summary: The new electrocatalyst EP-CoP shows improved efficiency and durability in CO2 reduction reactions by enhancing the dispersion of CoN4 sites and optimizing redox kinetics. In commercial flow cells, EP-CoP demonstrates excellent catalytic performance under various overpotential conditions.

ADVANCED MATERIALS (2023)

Article Chemistry, Multidisciplinary

Visible-Light-Driven CO2 Reduction with Homobimetallic Complexes. Cooperativity between Metals and Activation of Different Pathways

Jaya Bharti, Lingjing Chen, Zhenguo Guo, Lin Cheng, Joel Wellauer, Oliver S. Wenger, Niklas von Wolff, Kai-Chung Lau, Tai-Chu Lau, Gui Chen, Marc Robert

Summary: Visible-light-driven reduction of CO2 to CO and formate was achieved using a copper bisquaterpyridine complex, with the presence of a weak acid and a sensitizer. The reaction showed high selectivity for formate and CO.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2023)

Article Chemistry, Inorganic & Nuclear

Synthesis, structure and photoluminescence of Cu(i) complexes containing new functionalized 1,2,3-triazole ligands

Li-Xin Wang, Shun-Cheung Cheng, Yingying Liu, Chi-Fai Leung, Ji-Yan Liu, Chi-Chiu Ko, Tai-Chu Lau, Jing Xiang

Summary: A series of new copper(I) complexes have been synthesized and characterized. These complexes exhibit tunable emission spectra in solution and their molecular structures have been determined by X-ray crystallography. Density functional theory calculations reveal the characteristics of these complexes.

DALTON TRANSACTIONS (2023)

Article Chemistry, Inorganic & Nuclear

Minutely dispersed ruthenium in tremella-like N-doped carbon for enhanced visible-light-driven photocatalytic hydrogen production by CdS quantum dots

Jianhui Xie, Yijun Li, Denggen Nie, Leiyu Wang, Jing Chen, Bing Li, Jian-Bo He, Zhenguo Guo, Tai-Chu Lau

Summary: This study investigates the enhancement of semiconductor activity by anchoring CdS quantum dots on an N-doped carbon support with trace ruthenium dispersed as a cocatalyst. The experimental results demonstrate that the Ru/NC/CdS-5 catalyst with low ruthenium loading exhibits the highest photocatalytic activity and significantly improves hydrogen production rate.

INORGANIC CHEMISTRY FRONTIERS (2022)

Article Chemistry, Inorganic & Nuclear

The impact of Lewis acid variation on reactions with di-tert-butyl diazo diesters

Vaibhav Bedi, Dipendu Mandal, Zahid Hussain, Shi-Ming Chen, Yile Wu, Zheng-Wang Qu, Stefan Grimme, Douglas W. Stephan

Summary: The reaction of (tBuO(2)CN)(2) with 9-BBN leads to the formation of a bicyclic heterocyclic compound, while its reactions with BF3 or [Et3Si][B(C6F5)(4)] result in the isolation of different compounds. Computational studies reveal that the steric and electronic properties of the Lewis acid are important in the formation of one of the compounds.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Post-synthetic molecular modifications based on Schiff base condensation reactions for designing functional paddlewheel diruthenium(ii,ii) complexes

Chisa Itoh, Haruka Yoshino, Taku Kitayama, Wataru Kosaka, Hitoshi Miyasaka

Summary: A new synthetic route for constructing functional paddlewheel diruthenium(II,II) complexes was developed, utilizing Schiff base condensation reactions. The attached Schiff base groups significantly affected the electronic states of the resulting complexes, as revealed by cyclic voltammetry and DFT calculations.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

The pressure-stabilized polymorph of indium triiodide

Danrui Ni, Haozhe Wang, Xianghan Xu, Weiwei Xie, Robert J. Cava

Summary: A layered rhombohedral polymorph of indium(iii) triiodide is synthesized at high pressure and temperature. It has an orange color, which is different from ambient pressure InI3, which has a monoclinic molecular structure and a light-yellow color.

DALTON TRANSACTIONS (2024)

Review Chemistry, Inorganic & Nuclear

Unlocking the catalytic potential of gold(II) complexes: a comprehensive reassessment

Juan Carlos Perez-Sanchez, Raquel P. Herrera, M. Concepcion Gimeno

Summary: Gold(II) complexes have been less utilized in catalysis compared to their gold(I) and gold(III) counterparts. However, gold(II) complexes offer potential in homo-coupling and cross-coupling reactions, as they are more easily accessible through simplified oxidation and reduction processes. Gold(II) exhibits characteristics of both soft acid gold(I) and hard acid gold(III). This review explores the unique reactivity and potential applications of gold(II) species, highlighting their significance in catalytic transformations.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Enhancing isoprene polymerization with high activity and adjustable monomer enchainment using cyclooctyl-fused iminopyridine iron precatalysts

Nighat Yousuf, Yanping Ma, Qaiser Mahmood, Wenjuan Zhang, Yizhou Wang, Hassan Saeed, Wen-Hua Sun

Summary: In this study, a series of structurally rigid cyclooctyl-fused iminopyridine iron complexes were synthesized and used with methylaluminoxane for isoprene polymerization. The extent of steric hindrance of the ligand framework was found to significantly affect catalytic performance, with less hindrance leading to better activity and stability.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Improving the performance of perovskite solar cells using a dual-hole transport layer

Chenghao Song, Huiwei Du, Menglei Xu, Jie Yang, Xinyu Zhang, Jungan Wang, Yuanfang Zhang, Chengjun Gu, Rui Li, Tao Hong, Jingji Zhang, Jiangying Wang, Yongchun Ye

Summary: This study improves the performance of perovskite solar cells by using a dual-hole transport layer strategy. This strategy enhances the charge transfer efficiency of the transport layer, reduces charge recombination, and improves the quality of the perovskite film layer. Ultimately, the stability of the device is enhanced.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Aryl selenonium vs. aryl sulfonium counterions in polyoxometalate chemistry: the impact of Se+ cationic centers on the photocatalytic reduction of dichromate

Mahender Singh, Aakash Yadav, Ranjit Singh, Chullikkattil P. Pradeep

Summary: A new aryl selenonium polyoxometalate hybrid was developed and compared with an aryl sulfonium polyoxometalate hybrid in terms of their photocatalytic properties. It was found that the aryl selenonium hybrid exhibited better catalytic performance, which could be attributed to the larger atomic radii of selenium stabilizing the photogenerated electron-hole pair more efficiently. Additionally, the generation of elemental selenium through cleavage of C-Se bonds during catalysis was observed.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Construction of core-shell CoSe2/ZnIn2S4 heterostructures for efficient visible-light-driven photocatalytic hydrogen evolution

Yuhan Xie, Boyu Dong, Xuemin Wang, Siyuan Wang, Jinxi Chen, Yongbing Lou

Summary: This study successfully fabricated visible-light-responsive three-dimensional core-shell CoSe2/ZnIn2S4 heterostructures and achieved attractive activity in photocatalytic hydrogen evolution. The presence of CoSe2 improved light absorption and accelerated charge transfer kinetics. The strong interaction between CoSe2 and ZnIn2S4 reduced charge recombination, further enhancing photocatalytic activity for hydrogen evolution.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Promising TMDC-like optical and excitonic properties of the TiBr2 2H monolayer

Andre L. de O. Batista, Joao Marcos T. Palheta, Mauricio J. Piotrowski, Celso R. C. Rego, Diego Guedes-Sobrinho, Alexandre C. Dias

Summary: This study presents a simulation protocol that provides a solid foundation for exploring two-dimensional materials. Using the TiBr2 2H monolayer as an example, the study reveals its promising properties for optoelectronic and valleytronic applications, including its stability, spin-orbit coupling effects, and optical helicity selection rule.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

The {Cu2I2} cluster bearing metal organic frameworks: crystal structures and fluorescence detecting performances towards cysteine and explosive molecules

Jiang Jiang, Zi-Wei Li, Zhi-Zhuan Zhang, Bin Tan, Zhao-Feng Wu, Xiao-Ying Huang

Summary: In this work, two metal organic frameworks (MOFs) containing {Cu2I2} clusters, Eu-CuI-INA and Sr-K-CuI-INA, were synthesized and characterized. Both materials have a three-dimensional structure with {Cu2I2} clusters coordinated by INA(-) ligands and Eu3+ or Sr2+ ions. The Sr-K-CuI-INA material exhibited sensitive fluorescence sensing behaviors towards cysteine and nitro-bearing molecules, showing potential applications in bio and explosive molecule sensing. This work provides a good reference for designing fluorescent MOF probes containing CuI molecules.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Coral-like CoSe2@N-doped carbon with a high initial coulombic efficiency as advanced anode materials for Na-ion batteries

Zhiya Lin, Jiasheng Wu, Qianwen Ye, Yulong Chen, Hai Jia, Xiaohui Huang, Shaoming Ying

Summary: Na-ion batteries (NIBs) have attracted great interest as a potential technology for grid-scale energy storage due to the wide distribution, low cost, and environmental friendliness of sodium resources. However, their implementation is hindered by low rate capability and cycling stability caused by the large ionic size of Na+. In this study, a three-dimensional nanoarchitectured coral-like CoSe2@N-doped carbon (CL-CoSe2@NC) was synthesized, and it exhibited improved sodium storage properties with better electrode kinetics and a stable SEI film.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Mechanism of photocatalytic CO2 reduction to HCO2H by a robust multifunctional iridium complex

Ya-Qiong Zhang, Yu Zhang, Guoping Zeng, Rong-Zhen Liao, Man Li

Summary: The mechanism and selectivity of CO2 reduction under visible light were investigated using density functional calculations. The results showed that a tetradentate PNNP-type Iridium(III) complex exhibited high activity and selectivity in the reaction.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Enhanced thermoelectric properties of In-filled Co4Sb12 by dispersion of reduced graphene oxide

Sanyukta Ghosh, Shubhanth Jain, Soumya Ranjan Mishra, Gerda Rogl, Peter Rogl, Ernst Bauer, B. S. Murty, A. Govindaraj, Ramesh Chandra Mallik

Summary: In this study, reduced graphene oxide (rGO) was uniformly dispersed in the In0.5Co4Sb12 bulk material by ultrasonication, which effectively reduced the lattice thermal conductivity and improved the thermoelectric efficiency.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

An effective visible-light driven fumarate production from gaseous CO2 and pyruvate by the cationic zinc porphyrin-based photocatalytic system with dual biocatalysts

Mika Takeuchi, Yutaka Amao

Summary: This study developed an effective visible-light driven system for fumaric acid production using renewable resources such as biomass derivatives, providing an alternative to the current petroleum-based synthesis methods.

DALTON TRANSACTIONS (2024)

Article Chemistry, Inorganic & Nuclear

Tin-doped NiFe2O4 nanoblocks grown on an iron foil for efficient and stable water splitting at large current densities

Juan Jian, Meiting Wang, Zhuo Wang, Jingwen Meng, Yuqin Yang, Limin Chang

Summary: Developing low-cost and self-supported bifunctional catalysts is crucial for highly efficient water splitting devices. In this study, nano-NiFe2O4 was directly grown onto iron foil surface and Sn4+ was introduced into the NiFe2O4. The resulting Sn-NiFe2O4/IF showed low overpotentials and high current densities during oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), making it a promising catalyst for large-scale hydrogen production.

DALTON TRANSACTIONS (2024)