1
|
Zhang R, Shi J, Fu L, Liu YG, Jia Y, Han Z, Yuan K, Jiang HY. Direct Photocatalytic Methane Oxidation to Formaldehyde by N Doping Co-Decorated Mixed Crystal TiO 2. ACS NANO 2024; 18:12994-13005. [PMID: 38721844 DOI: 10.1021/acsnano.4c01318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
In this paper, N-doped TiO2 mixed crystals are prepared via direct calcination of TiN for highly selective oxidation of CH4 to HCHO at room temperature. The structures of the prepared TiO2 samples are characterized to be N-doped TiO2 of anatase and rutile mixed crystals. The crystal structures of TiO2 samples are determined by XRD spectra and Raman spectra, while N doping is demonstrated by TEM mapping, ONH inorganic element analysis, and high-resolution XPS results. Significantly, the production rate of HCHO is as high as 23.5 mmol·g-1·h-1 with a selectivity over 90%. Mechanism studies reveal that H2O is the main oxygen source and acts through the formation of ·OH. DFT calculations indicate that the construction of a mixed crystal structure and N-doping modification mainly act by increasing the adsorption capacity of H2O. An efficient photocatalyst was prepared by us to convert CH4 to HCHO with high yield and selectivity, greatly promoting the development of the photocatalytic CH4 conversion study.
Collapse
Affiliation(s)
- Ruixue Zhang
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Jiale Shi
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Lei Fu
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Ya-Ge Liu
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Yibing Jia
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Zhenyu Han
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Kun Yuan
- College of Chemical Engineering and Technology, Tianshui Normal University, Tianshui 741001, P. R. China
| | - Hai-Ying Jiang
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education and the Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, P.R. China
| |
Collapse
|
2
|
Chen J, Bai LQ, Dai YF, Deng LC, Wang Y, Zhang T, Chen KJ. Assembly of an iron-based complex into a metal-organic framework: a space confinement strategy for isolation of mono-iron complexes to protect from dimerization. Dalton Trans 2023; 52:18053-18060. [PMID: 37990915 DOI: 10.1039/d3dt02558f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Non-heme mononuclear iron complexes, especially when supported by tripodal tetradentate ligands, show promising C-H bond activation efficiency in catalytic reactions. Nevertheless, they intrinsically decay readily to their dinuclear form, and the dimerization process is inevitable in homogenous solution, which dramatically hinders their further application. Hence, we demonstrate that the mononuclear iron complex [(TPA)FeII-2L]2+ (L = labile ligands, mainly solvent molecules) was successfully encapsulated in a highly robust metal-organic framework UiO-66 via a two-step "ship-in-a-bottle" strategy. The nearly perfect size matching of the octahedral cages of the host UiO-66 provides ideal space confinement for the guest complex to protect from dimerization and dramatically increases the mono-nuclear complex stability compared to its un-confined state. The successful encapsulation of [(TPA)FeII-2L]2+ in UiO-66 was verified thoroughly by spectroscopy, microscopy, N2 adsorption, and electrochemistry characterization techniques. This work shows that encapsulating an unstable molecular complex in MOFs via a two-step "ship-in-a-bottle" strategy highlights opportunities for extending the heterogenization of homogeneous complexes.
Collapse
Affiliation(s)
- Juan Chen
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong 518057, China.
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
- Chongqing Innovation Center, Northwestern Polytechnical University, Chongqing, 401135, China
| | - Lu-Qi Bai
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
| | - Yi-Fei Dai
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
| | - Li-Cheng Deng
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
| | - Yu Wang
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
| | - Tao Zhang
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
| | - Kai-Jie Chen
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
| |
Collapse
|
3
|
Luo L, Han X, Wang K, Xu Y, Xiong L, Ma J, Guo Z, Tang J. Nearly 100% selective and visible-light-driven methane conversion to formaldehyde via. single-atom Cu and W δ. Nat Commun 2023; 14:2690. [PMID: 37165020 PMCID: PMC10172301 DOI: 10.1038/s41467-023-38334-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 04/25/2023] [Indexed: 05/12/2023] Open
Abstract
Direct solar-driven methane (CH4) reforming is highly desirable but challenging, particularly to achieve a value-added product with high selectivity. Here, we identify a synergistic ensemble effect of atomically dispersed copper (Cu) species and partially reduced tungsten (Wδ+), stabilised over an oxygen-vacancy-rich WO3, which enables exceptional photocatalytic CH4 conversion to formaldehyde (HCHO) under visible light, leading to nearly 100% selectivity, a very high yield of 4979.0 μmol·g-1 within 2 h, and the normalised mass activity of 8.5 × 106 μmol·g-1Cu·h-1 of HCHO at ambient temperature. In-situ EPR and XPS analyses indicate that the Cu species serve as the electron acceptor, promoting the photo-induced electron transfer from the conduction band to O2, generating reactive •OOH radicals. In parallel, the adjacent Wδ+ species act as the hole acceptor and the preferred adsorption and activation site of H2O to produce hydroxyl radicals (•OH), and thus activate CH4 to methyl radicals (•CH3). The synergy of the adjacent dual active sites boosts the overall efficiency and selectivity of the conversion process.
Collapse
Affiliation(s)
- Lei Luo
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, 710127, Xi'an, People's Republic of China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Zhongshan Road 457, 116023, Dalian, People's Republic of China
| | - Xiaoyu Han
- Department of Chemistry, The University of Manchester, Manchester, M13 9PL, UK
| | - Keran Wang
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, 710127, Xi'an, People's Republic of China
| | - Youxun Xu
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - Lunqiao Xiong
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - Jiani Ma
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, 710127, Xi'an, People's Republic of China
| | - Zhengxiao Guo
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, 999077, Hong Kong, People's Republic of China.
| | - Junwang Tang
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK.
| |
Collapse
|
4
|
Wang K, Luo L, Wang C, Tang J. Photocatalytic methane activation by dual reaction sites co-modified WO3. CHINESE JOURNAL OF CATALYSIS 2023. [DOI: 10.1016/s1872-2067(22)64169-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
|
5
|
Luo L, Fu L, Liu H, Xu Y, Xing J, Chang CR, Yang DY, Tang J. Synergy of Pd atoms and oxygen vacancies on In 2O 3 for methane conversion under visible light. Nat Commun 2022; 13:2930. [PMID: 35614052 PMCID: PMC9132922 DOI: 10.1038/s41467-022-30434-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 04/25/2022] [Indexed: 11/25/2022] Open
Abstract
Methane (CH4) oxidation to high value chemicals under mild conditions through photocatalysis is a sustainable and appealing pathway, nevertheless confronting the critical issues regarding both conversion and selectivity. Herein, under visible irradiation (420 nm), the synergy of palladium (Pd) atom cocatalyst and oxygen vacancies (OVs) on In2O3 nanorods enables superior photocatalytic CH4 activation by O2. The optimized catalyst reaches ca. 100 μmol h-1 of C1 oxygenates, with a selectivity of primary products (CH3OH and CH3OOH) up to 82.5%. Mechanism investigation elucidates that such superior photocatalysis is induced by the dedicated function of Pd single atoms and oxygen vacancies on boosting hole and electron transfer, respectively. O2 is proven to be the only oxygen source for CH3OH production, while H2O acts as the promoter for efficient CH4 activation through ·OH production and facilitates product desorption as indicated by DFT modeling. This work thus provides new understandings on simultaneous regulation of both activity and selectivity by the synergy of single atom cocatalysts and oxygen vacancies.
Collapse
Affiliation(s)
- Lei Luo
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an, PR China
| | - Lei Fu
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an, PR China
| | - Huifen Liu
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an, PR China
| | - Youxun Xu
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK
| | - Jialiang Xing
- Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The Energy and Catalysis Hub, College of Chemistry and Materials Science, Northwest University, Xi'an, PR China
| | - Chun-Ran Chang
- Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, PR China
| | - Dong-Yuan Yang
- Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, PR China.
- Shaanxi Yanchang Petroleum (Group) Corp. Ltd., Xi'an, 710069, PR China.
| | - Junwang Tang
- Department of Chemical Engineering, University College London, Torrington Place, London, WC1E 7JE, UK.
| |
Collapse
|
6
|
Sye KM, Leahy CA, Vura-Weis J. Low quantum efficiency of μ-oxo iron bisporphyrin photocatalysts explained with femtosecond M-edge XANES. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01081j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transient optical absorption and M-edge XANES identifies the predominant formation of an iron(iii) ion pair state over the desired iron(ii)/iron(iv)-oxo state as the source of poor photon-to-product yield in μ-oxo iron bisporphyrin photocatalysts.
Collapse
Affiliation(s)
- Kori M. Sye
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, Illinois 61801, USA
| | - Clare A. Leahy
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, Illinois 61801, USA
| | - Josh Vura-Weis
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, Illinois 61801, USA
| |
Collapse
|
7
|
Sousa SF, Ertem MZ, Faustino LA, Machado AEH, Concepcion JJ, Maia PIS, Patrocinio AOT. Mechanistic investigation of the aerobic oxidation of 2-pyridylacetate coordinated to a Ru(II) polypyridyl complex. Dalton Trans 2021; 50:15248-15259. [PMID: 34632989 DOI: 10.1039/d1dt02461b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new ruthenium polypyridyl complex, [Ru(bpy)2(acpy)]+ (acpy = 2-pyridylacetate, bpy = 2,2'-bipyridine), was synthesized and fully characterized. Distinct from the previously reported analog, [Ru(bpy)2(pic)]+ (pic = 2-pyridylcarboxylate), the new complex is unstable under aerobic conditions and undergoes oxidation to yield the corresponding α-keto-2-pyridyl-acetate (acpyoxi) coordinated to the RuII center. The reaction is one of the few examples of C-H activation at mild conditions using O2 as the primary oxidant and can provide mechanistic insights with important implications for catalysis. Theoretical and experimental investigations of this aerobic oxidative transformation indicate that it takes place in two steps, first producing the α-hydroxo-2-pyridyl-acetate analog and then the final product. The observed rate constant for the first oxidation was in the order of 10-2 h-1. The reaction is hindered in the presence of coordinating solvents indicating the role of the metal center in the process. Theoretical calculations at the M06-L level of theory were performed for multiple reaction pathways in order to gain insights into the most probable mechanism. Our results indicate that O2 binding to [Ru(bpy)2(acpy)]+ is favored by the relative instability of the six-ring chelate formed by the acpy ligand and the resulting RuIII-OO˙- superoxo is stabilized by the carboxylate group in the coordination sphere. C-H activation by this species involves high activation free energies (ΔG‡ = 41.1 kcal mol-1), thus the formation of a diruthenium μ-peroxo intermediate, [(RuIII(bpy)2(O-acpy))2O2]2+via interaction of a second [Ru(bpy)2(acpy)]+ was examined as an alternative pathway. The dimer yields two RuIVO centers with a low ΔG‡ of 2.3 kcal mol-1. The resulting RuIVO species can activate C-H bonds in acpy (ΔG‡ = 23.1 kcal mol-1) to produce the coordinated α-hydroxo-2-pyridylacetate. Further oxidation of this intermediate leads to the α-keto-2-pyridyl-acetate product. The findings provide new insights into the mechanism of C-H activation catalyzed by transition-metal complexes using O2 as the sole oxygen source.
Collapse
Affiliation(s)
- Sinval F Sousa
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
| | - Mehmed Z Ertem
- Chemistry Division, Energy & Photon Sciences Directorate, Brookhaven National Laboratory, Upton, USA.
| | - Leandro A Faustino
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
| | - Antonio Eduardo H Machado
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
| | - Javier J Concepcion
- Chemistry Division, Energy & Photon Sciences Directorate, Brookhaven National Laboratory, Upton, USA.
| | - Pedro I S Maia
- Núcleo de Desenvolvimento de Compostos Bioativos (NDCBio), Universidade Federal do Triângulo Mineiro, Av. Dr. Randolfo Borges 1400, 38025-440 Uberaba, MG, Brazil
| | - Antonio Otavio T Patrocinio
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
| |
Collapse
|
8
|
Singh S, Nautiyal D, Thetiot F, Le Poul N, Goswami T, Kumar A, Kumar S. Bioinspired Heterobimetallic Photocatalyst ( RuIIchrom-FeIIIcat) for Visible-Light-Driven C-H Oxidation of Organic Substrates via Dioxygen Activation. Inorg Chem 2021; 60:16059-16064. [PMID: 34662098 DOI: 10.1021/acs.inorgchem.1c02514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report a bioinspired heterobimetallic photocatalyst RuIIchrom-FeIIIcat and its relevant applications toward visible-light-driven C-H bond oxidation of a series of hydrocarbons using O2 as the O-atom source. The RuII center absorbs visible light near 460 nm and triggers a cascade of electrons to FeIII to afford a catalytically active high-valent FeIV═O species. The in situ formed FeIV═O has been employed for several high-impact oxidation reactions in the presence of triethanolamine (TEOA) as the sacrificial electron donor.
Collapse
Affiliation(s)
- Siddhant Singh
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun 248001, Uttarakhand, India
| | - Divyanshu Nautiyal
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun 248001, Uttarakhand, India
| | - Franck Thetiot
- CEMCA, CNRS, UMR 6521, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, CS 93837, Brest 29238, France
| | - Nicolas Le Poul
- CEMCA, CNRS, UMR 6521, Université de Bretagne Occidentale, 6 avenue Le Gorgeu, CS 93837, Brest 29238, France
| | - Tapas Goswami
- Department of Chemistry, University of Petroleum and Energy Studies, Bidholi, Dehradun 248007, Uttarakhand, India
| | - Arun Kumar
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun 248001, Uttarakhand, India
| | - Sushil Kumar
- Department of Chemistry, University of Petroleum and Energy Studies, Bidholi, Dehradun 248007, Uttarakhand, India
| |
Collapse
|
9
|
Baran W, Cholewiński M, Sobczak A, Adamek E. A New Mechanism of the Selective Photodegradation of Antibiotics in the Catalytic System Containing TiO 2 and the Inorganic Cations. Int J Mol Sci 2021; 22:8696. [PMID: 34445408 PMCID: PMC8395856 DOI: 10.3390/ijms22168696] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/09/2021] [Accepted: 08/11/2021] [Indexed: 12/20/2022] Open
Abstract
The mechanism of sulfisoxazole (SFF) selective removal by photocatalysis in the presence of titanium (IV) oxide (TiO2) and iron (III) chloride (FeCl3) was explained and the kinetics and degradation pathways of SFF and other antibiotics were compared. The effects of selected inorganic ions, oxygen conditions, pH, sorption processes and formation of coordination compounds on the photocatalytic process in the presence of TiO2 were also determined. The Fe3+ compounds added to the irradiated sulfonamide (SN) solution underwent surface sorption on TiO2 particles and act as acceptors of excited electrons. Most likely, the SFF degradation is also intensified by organic radicals or cation organic radicals. These radicals can be initially generated by reaction with electron holes, hydroxyl radicals and as a result of electron transfer mediated by iron ions and then participate in propagation processes. The high sensitivity of SFF to decomposition caused by organic radicals is associated with the steric effect and the high bond polarity of the amide substituent.
Collapse
Affiliation(s)
| | | | | | - Ewa Adamek
- Department of General and Analytical Chemistry, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Jagiellońska 4, 41-200 Sosnowiec, Poland; (W.B.); (M.C.); (A.S.)
| |
Collapse
|
10
|
Latifi R, Palluccio TD, Ye W, Minnick JL, Glinton KS, Rybak-Akimova EV, de Visser SP, Tahsini L. pH Changes That Induce an Axial Ligand Effect on Nonheme Iron(IV) Oxo Complexes with an Appended Aminopropyl Functionality. Inorg Chem 2021; 60:13821-13832. [PMID: 34291939 DOI: 10.1021/acs.inorgchem.1c01312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nonheme iron enzymes often utilize a high-valent iron(IV) oxo species for the biosynthesis of natural products, but their high reactivity often precludes structural and functional studies of these complexes. In this work, a combined experimental and computational study is presented on a biomimetic nonheme iron(IV) oxo complex bearing an aminopyridine macrocyclic ligand and its reactivity toward olefin epoxidation upon changes in the identity and coordination ability of the axial ligand. Herein, we show a dramatic effect of the pH on the oxygen-atom-transfer (OAT) reaction with substrates. In particular, these changes have occurred because of protonation of the axial-bound pendant amine group, where its coordination to iron is replaced by a solvent molecule or anionic ligand. This axial ligand effect influences the catalysis, and we observe enhanced cyclooctene epoxidation yields and turnover numbers in the presence of the unbound protonated pendant amine group. Density functional theory studies were performed to support the experiments and highlight that replacement of the pendant amine with a neutral or anionic ligand dramatically lowers the rate-determining barriers of cyclooctene epoxidation. The computational work further establishes that the change in OAT is due to electrostatic interactions of the pendant amine cation that favorably affect the barrier heights.
Collapse
Affiliation(s)
- Reza Latifi
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Taryn D Palluccio
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United States
| | - Wanhua Ye
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United States
| | - Jennifer L Minnick
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Kwame S Glinton
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Elena V Rybak-Akimova
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, United States
| | - Sam P de Visser
- Manchester Institute of Biotechnology and Department of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M1 7DN, United Kingdom
| | - Laleh Tahsini
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| |
Collapse
|
11
|
Huang S, Ouyang T, Zheng B, Dan M, Liu Z. Enhanced Photoelectrocatalytic Activities for CH
3
OH‐to‐HCHO Conversion on Fe
2
O
3
/MoO
3
: Fe‐O‐Mo Covalency Dominates the Intrinsic Activity. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101058] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sheng Huang
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Ting Ouyang
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Bang‐Feng Zheng
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Meng Dan
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Zhao‐Qing Liu
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| |
Collapse
|
12
|
Huang S, Ouyang T, Zheng B, Dan M, Liu Z. Enhanced Photoelectrocatalytic Activities for CH
3
OH‐to‐HCHO Conversion on Fe
2
O
3
/MoO
3
: Fe‐O‐Mo Covalency Dominates the Intrinsic Activity. Angew Chem Int Ed Engl 2021; 60:9546-9552. [DOI: 10.1002/anie.202101058] [Citation(s) in RCA: 104] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Indexed: 11/11/2022]
Affiliation(s)
- Sheng Huang
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Ting Ouyang
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Bang‐Feng Zheng
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Meng Dan
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| | - Zhao‐Qing Liu
- School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials/Huangpu Hydrogen Innovation Center Guangzhou University Guangzhou Higher Education Mega Center No. 230 Wai Huan Xi Road 510006 Guangzhou P. R. China
| |
Collapse
|
13
|
Song H, Meng X, Wang S, Zhou W, Song S, Kako T, Ye J. Selective Photo-oxidation of Methane to Methanol with Oxygen over Dual-Cocatalyst-Modified Titanium Dioxide. ACS Catal 2020. [DOI: 10.1021/acscatal.0c04329] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hui Song
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0814, Japan
| | - Xianguang Meng
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Hebei Provincial Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering, North China University of Science and Technology, Tangshan 063210, P. R. China
| | - Shengyao Wang
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- College of Science, Huazhong Agricultural University, Wuhan 430070, P. R. China
| | - Wei Zhou
- Department of Applied Physics, Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Faculty of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Shuang Song
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Tetsuya Kako
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Jinhua Ye
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0814, Japan
- TJU-NIMS International Collaboration Laboratory, School of Material Science and Engineering, Tianjin University, Tianjin 300072, P. R. China
| |
Collapse
|
14
|
Liu C, Batista ER, Aguirre NF, Yang P, Cawkwell MJ, Jakubikova E. SCC-DFTB Parameters for Fe-C Interactions. J Phys Chem A 2020; 124:9674-9682. [PMID: 33164521 DOI: 10.1021/acs.jpca.0c08202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present an optimized density-functional tight-binding (DFTB) parameterization for iron-based complexes based on the popular trans3d set of parameters. The transferability of the original and optimized parameterizations is assessed using a set of 50 iron complexes, which include carbonyl, cyanide, polypyridine, and cyclometalated ligands. DFTB-optimized structures predicted using the trans3d parameters show a good agreement with both experimental crystal geometries and density functional theory (DFT)-optimized structures for Fe-N bond lengths. Conversely, Fe-C bond lengths are systematically overestimated. We improve the accuracy of Fe-C interactions by truncating the Fe-O repulsive potential and reparameterizing the Fe-C repulsive potential using a training set of six isolated iron complexes. The new trans3d*-LANLFeC parameter set can produce accurate Fe-C bond lengths in both geometry optimizations and molecular dynamics (MD) simulations, without significantly affecting the accuracy of Fe-N bond lengths. Moreover, the potential energy curves of Fe-C interactions are considerably improved. This improved parameterization may open the door to accurate MD simulations at the DFTB level of theory for large systems containing iron complexes, such as sensitizer-semiconductor assemblies in dye-sensitized solar cells, that are not easily accessible with DFT approaches because of the large number of atoms.
Collapse
Affiliation(s)
- Chang Liu
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States.,Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Enrique R Batista
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Néstor F Aguirre
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Ping Yang
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - M J Cawkwell
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Elena Jakubikova
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27606, United States
| |
Collapse
|
15
|
Zhou W, Wu X, Miao M, Wang Z, Chen L, Shan S, Cao G, Yu D. Light Runs Across Iron Catalysts in Organic Transformations. Chemistry 2020; 26:15052-15064. [DOI: 10.1002/chem.202000508] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/24/2020] [Indexed: 12/23/2022]
Affiliation(s)
- Wen‐Jun Zhou
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education College of Chemistry Sichuan University Chengdu 610064 P. R. China
- College of Chemistry and Chemical Engineering Neijiang Normal University Neijiang 641100 P. R. China
| | - Xu‐Dong Wu
- Faculty of Material and Chemical Engineering Yibin University Yibin, Sichuan 644007 P. R. China
| | - Meng Miao
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education College of Chemistry Sichuan University Chengdu 610064 P. R. China
| | - Zhe‐Hao Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education College of Chemistry Sichuan University Chengdu 610064 P. R. China
| | - Liang Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education College of Chemistry Sichuan University Chengdu 610064 P. R. China
| | - Si‐Yi Shan
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education College of Chemistry Sichuan University Chengdu 610064 P. R. China
| | - Guang‐Mei Cao
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education College of Chemistry Sichuan University Chengdu 610064 P. R. China
| | - Da‐Gang Yu
- Key Laboratory of Green Chemistry & Technology of Ministry of, Education College of Chemistry Sichuan University Chengdu 610064 P. R. China
- Beijing National Laboratory for Molecular Sciences Beijing 100190 P. R. China
| |
Collapse
|
16
|
Vicens L, Olivo G, Costas M. Rational Design of Bioinspired Catalysts for Selective Oxidations. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02073] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Laia Vicens
- Institut de Quı́mica Computacional i Catàlisi (IQCC) and Departament de Quı́mica, Universitat de Girona, Campus de Montilivi, 17071 Girona, Spain
| | - Giorgio Olivo
- Institut de Quı́mica Computacional i Catàlisi (IQCC) and Departament de Quı́mica, Universitat de Girona, Campus de Montilivi, 17071 Girona, Spain
| | - Miquel Costas
- Institut de Quı́mica Computacional i Catàlisi (IQCC) and Departament de Quı́mica, Universitat de Girona, Campus de Montilivi, 17071 Girona, Spain
| |
Collapse
|
17
|
Du YD, Zhou CY, To WP, Wang HX, Che CM. Iron porphyrin catalysed light driven C-H bond amination and alkene aziridination with organic azides. Chem Sci 2020; 11:4680-4686. [PMID: 34122922 PMCID: PMC8159214 DOI: 10.1039/d0sc00784f] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Visible light driven nitrene transfer and insertion reactions of organic azides are an attractive strategy for the design of C-N bond formation reactions under mild reaction conditions, the challenge being lack of selectivity as a free nitrene reactive intermediate is usually involved. Herein is described an iron(iii) porphyrin catalysed sp3 C-H amination and alkene aziridination with selectivity by using organic azides as the nitrogen source under blue LED light (469 nm) irradiation. The photochemical reactions display chemo- and regio-selectivity and are effective for the late-stage functionalization of natural and bioactive compounds with complexity. Mechanistic studies revealed that iron porphyrin plays a dual role as a photosensitizer and as a catalyst giving rise to a reactive iron-nitrene intermediate for subsequent C-N bond formation.
Collapse
Affiliation(s)
- Yi-Dan Du
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong China .,Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry 354 Feng Lin Road Shanghai China
| | - Cong-Ying Zhou
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong China
| | - Wai-Pong To
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong China
| | - Hai-Xu Wang
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong China
| | - Chi-Ming Che
- State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong China .,HKU Shenzhen Institute of Research & Innovation Shenzhen China.,Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry 354 Feng Lin Road Shanghai China
| |
Collapse
|
18
|
Singh B, Das RS. Studies on the oxidative degradation of paracetamol by a μ-oxo-diiron(III) complex. CAN J CHEM 2020. [DOI: 10.1139/cjc-2019-0193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In higher organisms, metalloenzymes like cytochrome P450, containing a Fe(III) metal center, play an active role in metabolism of paracetamol (APAP). Here, we have chosen a mimicking μ-oxo-diiron complex, [Fe(III)2(μ-O)(phen)4(H2O)2]4+(1, phen = 1,10-phenanthroline), to study spectrophotometrically the kinetics of the redox interactions with APAP. In acidic buffer media (pH = 3.4–5.1), APAP quantitatively reduces 1 following first-order reaction kinetics. Each molecule of 1 accepts two electrons from APAP and is reduced to ferroin [Fe(phen)3]2+. On oxidation, APAP produces N-acetyl-p-benzoquinone imine (NAPQI), which on hydrolysis results in a mixture of benzoquinone, quinone oxime, acetamide, and acetic acid. In reaction media due to successive deprotonations, 1 exists in equilibrium with the species [Fe(III)2(μ-O)(phen)4(H2O)(OH)]3+(1a) and [Fe(III)2(μ-O)(phen)4(OH)2]2+(1b) (pKa= 3.71 and 5.28, respectively). The kinetic analyses suggest for an unusual reactivity order as 1 < 1a ≫ 1b. The mechanistic possibilities suggest that although 1 is reduced by concerted electron transfer (ET) – proton transfer (PT) mechanism, 1a and 1b may be reduced by a concerted PT–ET mechanism where a slow proton-abstraction step is followed by a rapid ET process. It seems that the initial activation of the bridging μ-oxo group by a proton-abstraction results in the higher reactivity of 1a.
Collapse
Affiliation(s)
- Bula Singh
- Department of Chemistry, Visva-Bharati, Santiniketan 731235, India
| | - Ranendu Sekhar Das
- Department of Chemistry, Ranaghat College, Nadia, West Bengal 741201, India
| |
Collapse
|
19
|
Vöhringer P. Vibrations tell the tale. A time-resolved mid-infrared perspective of the photochemistry of iron complexes. Dalton Trans 2020; 49:256-266. [DOI: 10.1039/c9dt04165f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Time-resolved infrared spectroscopies are used to elucidate multiscalar photochemical processes of iron complexes.
Collapse
Affiliation(s)
- Peter Vöhringer
- Abteilung für Molekulare Physikalische Chemie
- Institut für Physikalische und Theoretische Chemie
- Rheinische Friedrich-Wilhelms-Universität
- 53115 Bonn
- Germany
| |
Collapse
|
20
|
Song H, Meng X, Wang S, Zhou W, Wang X, Kako T, Ye J. Direct and Selective Photocatalytic Oxidation of CH 4 to Oxygenates with O 2 on Cocatalysts/ZnO at Room Temperature in Water. J Am Chem Soc 2019; 141:20507-20515. [PMID: 31834789 DOI: 10.1021/jacs.9b11440] [Citation(s) in RCA: 136] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Direct conversion of methane into methanol and other liquid oxygenates still confronts considerable challenges in activating the first C-H bond of methane and inhibiting overoxidation. Here, we report that ZnO loaded with appropriate cocatalysts (Pt, Pd, Au, or Ag) enables direct oxidation of methane to methanol and formaldehyde in water using only molecular oxygen as the oxidant under mild light irradiation at room temperature. Up to 250 micromoles of liquid oxygenates with ∼95% selectivity is achieved for 2 h over 10 mg of ZnO loaded with 0.1 wt % of Au. Experiments with isotopically labeled oxygen and water reveal that molecular O2, rather than water, is the source of oxygen for direct CH4 oxidation. We find that ZnO and cocatalyst could concertedly activate CH4 and O2 into methyl radical and mildly oxidative intermediate (hydroperoxyl radical) in water, which are two key precursor intermediates for generating oxygenated liquid products in direct CH4 oxidation. Our study underlines two equally significant aspects for realizing direct and selective photooxidation of CH4 to liquid oxygenates, i.e., efficient C-H bond activation of CH4 and controllable activation of O2.
Collapse
Affiliation(s)
- Hui Song
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan.,Graduate School of Chemical Sciences and Engineering , Hokkaido University , Sapporo 060-0814 , Japan
| | - Xianguang Meng
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan.,Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering , North China University of Science and Technology , Tangshan 063210 , P. R. China
| | - Shengyao Wang
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Wei Zhou
- Department of Applied Physics, Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Faculty of Science , Tianjin University , Tianjin 300072 , P. R. China
| | - Xusheng Wang
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Tetsuya Kako
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Jinhua Ye
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan.,Graduate School of Chemical Sciences and Engineering , Hokkaido University , Sapporo 060-0814 , Japan.,TJU-NIMS International Collaboration Laboratory, School of Material Science and Engineering , Tianjin University , Tianjin 300072 , P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Tianjin 300072 , P. R. China
| |
Collapse
|
21
|
Cordes Née Kupper C, Morganti M, Klawitter I, Schremmer C, Dechert S, Meyer F. Disproportionation Equilibrium of a μ-Oxodiiron(III) Complex Giving Rise to C-H Activation Reactivity: Structural Snapshot of a Unique Oxoiron(IV) Adduct. Angew Chem Int Ed Engl 2019; 58:10855-10858. [PMID: 31094040 DOI: 10.1002/anie.201900683] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Indexed: 01/08/2023]
Abstract
μ-Oxodiiron(III) species are air-stable and unreactive products of autoxidation processes of monomeric heme and non-heme iron(II) complexes. Now, the organometallic [(LNHC )FeIII -(μ-O)-FeIII (LNHC )]4+ complex 1 (LNHC is a macrocyclic tetracarbene) is shown to be reactive in C-H activation without addition of further oxidants. Studying the oxidation of dihydroanthracene, it was found that 1 thermally disproportionates in MeCN solution into its oxoiron(IV) (2) and iron(II) components; the former is the active species in the observed oxidation processes. Possible cleavage scenarios for 1 are shown by scrambling experiments and structural characterization of an unprecedented adduct of 1 and oxoiron(IV) complex 2. Kinetic analysis gave an equilibrium constant for the disproportionation of 1, which is very small (Keq =7.5±2.5×10-8 m). Increasing Keq might by a useful strategy for circumventing the formation of dead-end μ-oxodiiron(III) products during Fe-based homogeneous oxidation catalysis.
Collapse
Affiliation(s)
| | - Massimiliano Morganti
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstr. 4, d-37077, Göttingen, Germany
| | - Iris Klawitter
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstr. 4, d-37077, Göttingen, Germany
| | - Claudia Schremmer
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstr. 4, d-37077, Göttingen, Germany
| | - Sebastian Dechert
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstr. 4, d-37077, Göttingen, Germany
| | - Franc Meyer
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstr. 4, d-37077, Göttingen, Germany
| |
Collapse
|
22
|
Cordes (née Kupper) C, Morganti M, Klawitter I, Schremmer C, Dechert S, Meyer F. Disproportionation Equilibrium of a
μ
‐Oxodiiron(III) Complex Giving Rise to C−H Activation Reactivity: Structural Snapshot of a Unique Oxoiron(IV) Adduct. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900683] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | - Massimiliano Morganti
- Universität GöttingenInstitut für Anorganische Chemie Tammannstr. 4 d-37077 Göttingen Germany
| | - Iris Klawitter
- Universität GöttingenInstitut für Anorganische Chemie Tammannstr. 4 d-37077 Göttingen Germany
| | - Claudia Schremmer
- Universität GöttingenInstitut für Anorganische Chemie Tammannstr. 4 d-37077 Göttingen Germany
| | - Sebastian Dechert
- Universität GöttingenInstitut für Anorganische Chemie Tammannstr. 4 d-37077 Göttingen Germany
| | - Franc Meyer
- Universität GöttingenInstitut für Anorganische Chemie Tammannstr. 4 d-37077 Göttingen Germany
| |
Collapse
|
23
|
|
24
|
Chen J, Unjaroen D, Stepanovic S, van Dam A, Gruden M, Browne WR. Selective Photo-Induced Oxidation with O 2 of a Non-Heme Iron(III) Complex to a Bis(imine-pyridyl)iron(II) Complex. Inorg Chem 2018; 57:4510-4515. [PMID: 29601196 PMCID: PMC5906753 DOI: 10.1021/acs.inorgchem.8b00187] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Non-heme iron(II)
complexes of pentadentate N4Py (N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methylamine)
type ligands undergo visible light-driven oxidation to their iron(III)
state in the presence of O2 without ligand degradation.
Under mildly basic conditions, however, highly selective base catalyzed
ligand degradation with O2, to form a well-defined pyridyl-imine
iron(II) complex and an iron(III) picolinate complex, is accelerated
photochemically. Specifically, a pyridyl-CH2 moiety is
lost from the ligand, yielding a potentially N4 coordinating ligand
containing an imine motif. The involvement of reactive oxygen species
other than O2 is excluded; instead, deprotonation at the
benzylic positions to generate an amine radical is proposed as the
rate determining step. The selective nature of the transformation
holds implications for efforts to increase catalyst robustness through
ligand design. Photoaccelerated oxidation
of an aminopyridyl ligand bound
to an Fe(III) ion to a well-defined imine-based Fe(II) complex involves
initial alkyl C−H deprotonation followed by reaction with O2 to form an alkyl peroxyl radical. Intramolecular C−H
abstraction followed by C−N bond cleavage yields picoline aldehyde
and a pyridyl-imine complex. The selectivity of the reaction prevents
further oxidation and holds implications for ligand degradation under
conditions used in oxidation catalysis with peroxides.
Collapse
Affiliation(s)
- Juan Chen
- Stratingh Institute for Chemistry, Faculty of Science and Engineering , University of Groningen , Nijenborgh 4 , 9747AG Groningen , The Netherlands
| | - Duenpen Unjaroen
- Stratingh Institute for Chemistry, Faculty of Science and Engineering , University of Groningen , Nijenborgh 4 , 9747AG Groningen , The Netherlands
| | - Stepan Stepanovic
- University of Belgrade , Faculty of Chemistry , Studentski trg 12-16 , 11000 Belgrade , Serbia
| | - Annie van Dam
- Interfaculty Mass Spectrometry Center , University of Groningen , Groningen , The Netherlands
| | - Maja Gruden
- University of Belgrade , Faculty of Chemistry , Studentski trg 12-16 , 11000 Belgrade , Serbia
| | - Wesley R Browne
- Stratingh Institute for Chemistry, Faculty of Science and Engineering , University of Groningen , Nijenborgh 4 , 9747AG Groningen , The Netherlands
| |
Collapse
|
25
|
Chen J, Stepanovic S, Draksharapu A, Gruden M, Browne WR. A Non-Heme Iron Photocatalyst for Light-Driven Aerobic Oxidation of Methanol. Angew Chem Int Ed Engl 2018; 57:3207-3211. [PMID: 29334586 PMCID: PMC5887871 DOI: 10.1002/anie.201712678] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Indexed: 11/29/2022]
Abstract
Non‐heme (L)FeIII and (L)FeIII‐O‐FeIII(L) complexes (L=1,1‐di(pyridin‐2‐yl)‐N,N‐bis(pyridin‐2‐ylmethyl)ethan‐1‐amine) underwent reduction under irradiation to the FeII state with concomitant oxidation of methanol to methanal, without the need for a secondary photosensitizer. Spectroscopic and DFT studies support a mechanism in which irradiation results in charge‐transfer excitation of a FeIII−μ‐O−FeIII complex to generate [(L)FeIV=O]2+ (observed transiently during irradiation in acetonitrile), and an equivalent of (L)FeII. Under aerobic conditions, irradiation accelerates reoxidation from the FeII to the FeIII state with O2, thus closing the cycle of methanol oxidation to methanal.
Collapse
Affiliation(s)
- Juan Chen
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, Faculty of Science and Engineering, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands
| | - Stepan Stepanovic
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000, Belgrade, Serbia
| | - Apparao Draksharapu
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, Faculty of Science and Engineering, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands.,Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN, 55455, USA
| | - Maja Gruden
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000, Belgrade, Serbia
| | - Wesley R Browne
- Molecular Inorganic Chemistry, Stratingh Institute for Chemistry, Faculty of Science and Engineering, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands
| |
Collapse
|