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Bo CB, Bu Q, Li X, Ma G, Wei D, Guo C, Dai B, Liu N. Highly Active and Robust Ruthenium Complexes Based on Hemilability of Hybrid Ligands for C–H Oxidation. J Org Chem 2020; 85:4324-4334. [DOI: 10.1021/acs.joc.0c00025] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Chun-Bo Bo
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Qingqing Bu
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Xue Li
- College of Chemistry and Molecular Engineering, Center of Computational Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan 450001, People’s Republic of China
| | - Ge Ma
- Cancer Institute, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, People’s Republic of China
| | - Donghui Wei
- College of Chemistry and Molecular Engineering, Center of Computational Chemistry, Zhengzhou University, 100 Science Avenue, Zhengzhou, Henan 450001, People’s Republic of China
| | - Cheng Guo
- Cancer Institute, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, People’s Republic of China
| | - Bin Dai
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Ning Liu
- School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
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2
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Kuyuldar S, Burda C, Connick WB. Tuning two-electron transfer in terpyridine-based platinum(ii) pincer complexes. RSC Adv 2019; 9:21116-21124. [PMID: 35521348 PMCID: PMC9066165 DOI: 10.1039/c9ra03939b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 06/24/2019] [Indexed: 01/31/2023] Open
Abstract
An important factor in obtaining reversible multi-electron transfer is overcoming large changes in coordination geometry. One strategy is to use ligands that can support the geometries favored before and after the electron transfer. Pip2NCN− pincer and terpyridine ligands are used to support square planar Pt(ii) and octahedral Pt(iv). For the Pt(ii) complexes, [Pt(Z-pip2NCN)(R-tpy)]+ (Z = NO2, MeO, H; R = H, tertyl butyl, tolyl), 1H NMR spectroscopy shows that the Z-pip2NCN− ligand is monodentate whereas the R-terpyridyl ligand is tridentate. The availability of flanking piperidyl groups of the monodentate pincer ligand is essential for the stabilization of the metal center upon oxidation. Pt(Z-pip2NCN)(R-tpy)+ complexes undergo two-electron platinum centered oxidation near 0.4 V and two Pt(tpy) centered reductions near −1.0 V and −1.5 V. An estimate of nox/nred = 1.8 is consistent with an oxidation that involves two-electron transfer per Pt center. Variation in the pincer-(Z) and terpyridine-(R) substituents allows for tuning of the oxidation process over a 260 mV range and the two reduction processes over ranges of 230 mV (first reduction) and 290 mV (second reduction step). Square planar Pt(ii) terpyridine complexes with pincer ligands undergo two-electron oxidation and variation in the ligand substituents allows for tuning of the two-electron oxidation process over a 260 mV range.![]()
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Affiliation(s)
- Seher Kuyuldar
- University of Cincinnati, Department of Chemistry 2600 Clifton Ave. Cincinnati OH 45221 USA.,Case Western Reserve University, Department of Chemistry 10900 Euclid Ave. Cleveland OH 44106 USA
| | - Clemens Burda
- Case Western Reserve University, Department of Chemistry 10900 Euclid Ave. Cleveland OH 44106 USA
| | - William B Connick
- University of Cincinnati, Department of Chemistry 2600 Clifton Ave. Cincinnati OH 45221 USA
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3
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Manrique E, Fontrodona X, Rodríguez M, Romero I. A Ruthenium(II) Aqua Complex as Efficient Chemical and Photochemical Catalyst for Alkene and Alcohol Oxidation. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801206] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ester Manrique
- Departament de Quimica and Serveis Tècnics de Recerca Universitat de Girona C/Mª Aurèlia Capmany 69 17003 Girona Spain
| | - Xavier Fontrodona
- Departament de Quimica and Serveis Tècnics de Recerca Universitat de Girona C/Mª Aurèlia Capmany 69 17003 Girona Spain
| | - Montserrat Rodríguez
- Departament de Quimica and Serveis Tècnics de Recerca Universitat de Girona C/Mª Aurèlia Capmany 69 17003 Girona Spain
| | - Isabel Romero
- Departament de Quimica and Serveis Tècnics de Recerca Universitat de Girona C/Mª Aurèlia Capmany 69 17003 Girona Spain
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4
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Shimoyama Y, Ishizuka T, Kotani H, Kojima T. Ruthenium(II) Complexes Having a Pincer-Type Ligand with Two N
-Heterocyclic Carbene Moieties. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yoshihiro Shimoyama
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 305-8571 1-1-1 Tennoudai Tsukuba Ibaraki Japan
| | - Tomoya Ishizuka
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 305-8571 1-1-1 Tennoudai Tsukuba Ibaraki Japan
| | - Hiroaki Kotani
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 305-8571 1-1-1 Tennoudai Tsukuba Ibaraki Japan
| | - Takahiko Kojima
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 305-8571 1-1-1 Tennoudai Tsukuba Ibaraki Japan
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5
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Gupta SK, Choudhury J. A Mixed N-Heterocyclic Carbene/2,2′-Bipyridine-Supported Robust Ruthenium(II) Oxidation Precatalyst for Benzylic C−H Oxidation. ChemCatChem 2017. [DOI: 10.1002/cctc.201700177] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Suraj K. Gupta
- Organometallics & Smart Materials Laboratory; Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal 462 066 India
| | - Joyanta Choudhury
- Organometallics & Smart Materials Laboratory; Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal 462 066 India
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6
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Octahedral Ruthenium Complex with Exclusive Metal-Centered Chirality for Highly Effective Asymmetric Catalysis. J Am Chem Soc 2017; 139:4322-4325. [PMID: 28290685 DOI: 10.1021/jacs.7b01098] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A novel ruthenium catalyst is introduced which contains solely achiral ligands and acquires its chirality entirely from octahedral centrochirality. The configurationally stable catalyst is demonstrated to catalyze the alkynylation of trifluoromethyl ketones with very high enantioselectivity (up to >99% ee) at low catalyst loadings (down to 0.2 mol%).
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7
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Liu HJ, Gil-Sepulcre M, Francàs L, Nolis P, Parella T, Benet-Buchholz J, Fontrodona X, García-Antón J, Romero N, Llobet A, Escriche L, Bofill R, Sala X. Mononuclear ruthenium compounds bearing N-donor and N-heterocyclic carbene ligands: structure and oxidative catalysis. Dalton Trans 2017; 46:2829-2843. [PMID: 28177011 DOI: 10.1039/c6dt04729g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new CNNC carbene-phthalazine tetradentate ligand has been synthesised, which in the reaction with [Ru(T)Cl3] (T = trpy, tpm, bpea; trpy = 2,2';6',2''-terpyridine; tpm = tris(pyrazol-1-yl)methane; bpea = N,N-bis(pyridin-2-ylmethyl)ethanamine) in MeOH or iPrOH undergoes a C-N bond scission due to the nucleophilic attack of a solvent molecule, with the subsequent formation of the mononuclear complexes cis-[Ru(PhthaPz-OR)(trpy)X]n+, [Ru(PhthaPz-OMe)(tpm)X]n+ and trans,fac-[Ru(PhthaPz-OMe)(bpea)X]n+ (X = Cl, n = 1; X = H2O, n = 2; PhthaPz-OR = 1-(4-alkoxyphthalazin-1-yl)-3-methyl-1H-imidazol-3-ium), named 1a+/2a2+ (R = Me), 1b+/2b2+ (R = iPr), 3+/42+ and 5+/62+, respectively. Interestingly, regulation of the stability regions of different Ru oxidation states is obtained by different ligand combinations, going from 62+, where Ru(iii) is clearly stable and mono-electronic transfers are favoured, to 2a2+/2b2+, where Ru(iii) is almost unstable with regard to its disproportionation. The catalytic performance of the Ru-OH2 complexes in chemical water oxidation at pH 1.0 points to poor stability (ligand oxidation), with subsequent evolution of CO2 together with O2, especially for 42+ and 62+. In electrochemically driven water oxidation, the highest TOF values are obtained for 2a2+ at pH 1.0. In alkene epoxidation, complexes favouring bi-electronic transfer processes show better performances and selectivities than those favouring mono-electronic transfers, while alkenes containing electron-donor groups show better performances than those bearing electron-withdrawing groups. Finally, when cis-β-methylstyrene is employed as the substrate, no cis/trans isomerization takes place, thus indicating the existence of a stereospecific process.
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Affiliation(s)
- Hai-Jie Liu
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Marcos Gil-Sepulcre
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Laia Francàs
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Catalonia, Spain
| | - Pau Nolis
- Servei de Ressonància Magnètica Nuclear, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain
| | - Teodor Parella
- Servei de Ressonància Magnètica Nuclear, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Catalonia, Spain
| | - Xavier Fontrodona
- Serveis Tècnics de Recerca, Edifici P-II, Campus Montilivi, Universitat de Girona, 17071 Girona, Catalonia, Spain
| | - Jordi García-Antón
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Nuria Romero
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Antoni Llobet
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain. and Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Catalonia, Spain
| | - Lluís Escriche
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Roger Bofill
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
| | - Xavier Sala
- Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain.
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8
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Ferrer Í, Fontrodona X, Roig A, Rodríguez M, Romero I. A Recoverable Ruthenium Aqua Complex Supported on Silica Particles: An Efficient Epoxidation Catalyst. Chemistry 2017; 23:4096-4107. [DOI: 10.1002/chem.201604463] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Íngrid Ferrer
- Departament de Química and Serveis Tècnics de Recerca; Universitat de Girona; Campus de Montilivi 17003 Girona Spain
| | - Xavier Fontrodona
- Departament de Química and Serveis Tècnics de Recerca; Universitat de Girona; Campus de Montilivi 17003 Girona Spain
| | - Anna Roig
- Institut de Ciència de Materials de Barcelona; ICMAB (CSIC), Campus UAB; 08193 Bellaterra Spain
| | - Montserrat Rodríguez
- Departament de Química and Serveis Tècnics de Recerca; Universitat de Girona; Campus de Montilivi 17003 Girona Spain
| | - Isabel Romero
- Departament de Química and Serveis Tècnics de Recerca; Universitat de Girona; Campus de Montilivi 17003 Girona Spain
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9
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Shimoyama Y, Ishizuka T, Kotani H, Shiota Y, Yoshizawa K, Mieda K, Ogura T, Okajima T, Nozawa S, Kojima T. A Ruthenium(III)-Oxyl Complex Bearing Strong Radical Character. Angew Chem Int Ed Engl 2016; 55:14041-14045. [PMID: 27709765 DOI: 10.1002/anie.201607861] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 09/15/2016] [Indexed: 11/07/2022]
Abstract
Proton-coupled electron-transfer oxidation of a RuII -OH2 complex, having an N-heterocyclic carbene ligand, gives a RuIII -O. species, which has an electronically equivalent structure of the RuIV =O species, in an acidic aqueous solution. The RuIII -O. complex was characterized by spectroscopic methods and DFT calculations. The oxidation state of the Ru center was shown to be close to +3; the Ru-O bond showed a lower-energy Raman scattering at 732 cm-1 and the Ru-O bond length was estimated to be 1.77(1) Å. The RuIII -O. complex exhibits high reactivity in substrate oxidation under catalytic conditions; particularly, benzaldehyde and the derivatives are oxidized to the corresponding benzoic acid through C-H abstraction from the formyl group by the RuIII -O. complex bearing a strong radical character as the active species.
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Affiliation(s)
- Yoshihiro Shimoyama
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8571, Japan
| | - Tomoya Ishizuka
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8571, Japan
| | - Hiroaki Kotani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8571, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering, Kyushu University, Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University, Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan
| | - Kaoru Mieda
- Picobiology Institute, Graduate School of Life Science, University of Hyogo, RSC-UH Leading Program Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan
| | - Takashi Ogura
- Picobiology Institute, Graduate School of Life Science, University of Hyogo, RSC-UH Leading Program Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan
| | - Toshihiro Okajima
- Kyushu Synchrotron Light Research Center, 8-7 Yayoigaoka, Tosu, Saga, 841-0005, Japan
| | - Shunsuke Nozawa
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan
| | - Takahiko Kojima
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8571, Japan.
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10
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Shimoyama Y, Ishizuka T, Kotani H, Shiota Y, Yoshizawa K, Mieda K, Ogura T, Okajima T, Nozawa S, Kojima T. A Ruthenium(III)-Oxyl Complex Bearing Strong Radical Character. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607861] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yoshihiro Shimoyama
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
| | - Tomoya Ishizuka
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
| | - Hiroaki Kotani
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering; Kyushu University; Motooka, Nishi-Ku Fukuoka 819-0395 Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering; Kyushu University; Motooka, Nishi-Ku Fukuoka 819-0395 Japan
| | - Kaoru Mieda
- Picobiology Institute, Graduate School of Life Science; University of Hyogo; RSC-UH Leading Program Center; 1-1-1 Kouto, Sayo-cho, Sayo-gun Hyogo 679-5148 Japan
| | - Takashi Ogura
- Picobiology Institute, Graduate School of Life Science; University of Hyogo; RSC-UH Leading Program Center; 1-1-1 Kouto, Sayo-cho, Sayo-gun Hyogo 679-5148 Japan
| | - Toshihiro Okajima
- Kyushu Synchrotron Light Research Center; 8-7 Yayoigaoka, Tosu Saga 841-0005 Japan
| | - Shunsuke Nozawa
- Photon Factory; Institute of Materials Structure Science; High Energy Accelerator Research Organization (KEK); 1-1 Oho, Tsukuba Ibaraki 305-0801 Japan
| | - Takahiko Kojima
- Department of Chemistry; Faculty of Pure and Applied Sciences; University of Tsukuba; 1-1-1 Tennoudai, Tsukuba Ibaraki 305-8571 Japan
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11
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12
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Lv Z, Zheng W, Chen Z, Tang Z, Mo W, Yin G. Synergistic oxygen atom transfer by ruthenium complexes with non-redox metal ions. Dalton Trans 2016; 45:11369-83. [PMID: 27333442 DOI: 10.1039/c6dt01077f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Non-redox metal ions can affect the reactivity of active redox metal ions in versatile biological and heterogeneous oxidation processes; however, the intrinsic roles of these non-redox ions still remain elusive. This work demonstrates the first example of the use of non-redox metal ions as Lewis acids to sharply improve the catalytic oxygen atom transfer efficiency of a ruthenium complex bearing the classic 2,2'-bipyridine ligand. In the absence of Lewis acid, the oxidation of ruthenium(ii) complex by PhI(OAc)2 generates the Ru(iv)[double bond, length as m-dash]O species, which is very sluggish for olefin epoxidation. When Ru(bpy)2Cl2 was tested as a catalyst alone, only 21.2% of cyclooctene was converted, and the yield of 1,2-epoxycyclooctane was only 6.7%. As evidenced by electronic absorption spectra and EPR studies, both the oxidation of Ru(ii) by PhI(OAc)2 and the reduction of Ru(iv)[double bond, length as m-dash]O by olefin are kinetically slow. However, adding non-redox metal ions such as Al(iii) can sharply improve the oxygen transfer efficiency of the catalyst to 100% conversion with 89.9% yield of epoxide under identical conditions. Through various spectroscopic characterizations, an adduct of Ru(iv)[double bond, length as m-dash]O with Al(iii), Ru(iv)[double bond, length as m-dash]O/Al(iii), was proposed to serve as the active species for epoxidation, which in turn generated a Ru(iii)-O-Ru(iii) dimer as the reduced form. In particular, both the oxygen transfer from Ru(iv)[double bond, length as m-dash]O/Al(iii) to olefin and the oxidation of Ru(iii)-O-Ru(iii) back to the active Ru(iv)[double bond, length as m-dash]O/Al(iii) species in the catalytic cycle can be remarkably accelerated by adding a non-redox metal, such as Al(iii). These results have important implications for the role played by non-redox metal ions in catalytic oxidation at redox metal centers as well as for the understanding of the redox mechanism of ruthenium catalysts in the oxygen atom transfer reaction.
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Affiliation(s)
- Zhanao Lv
- Key laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Key laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
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13
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Dakkach M, Fontrodona X, Parella T, Atlamsani A, Romero I, Rodríguez M. Polypyrrole-functionalized ruthenium carbene catalysts as efficient heterogeneous systems for olefin epoxidation. Dalton Trans 2014; 43:9916-23. [PMID: 24848551 DOI: 10.1039/c4dt00698d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
New Ru complexes containing the bpea-pyr ligand (bpea-pyr stands for N,N-bis(pyridin-2-ylmethyl)-3-(1H-pyrrol-1-yl)propan-1-amine), with the formula [RuCl2(bpea-pyr)(dmso)] (isomeric complexes 2a and 2b) or [Ru(CN-Me)(bpea-pyr)X)](n+) (CN-Me = 3-methyl-1-(pyridin-2-yl)-1H-imidazol-3-ium-2-ide; X = Cl, 3, or X = H2O, 4), have been prepared and fully characterized. Complexes 3 and 4 have been anchored onto an electrode surface through electropolymerization of the attached pyrrole group, yielding stable polypyrrole films. The electrochemical behaviour of 4, which displays a bielectronic Ru(IV/II) redox pair in solution, is dramatically affected by the electropolymerization process leading to the occurrence of two monoelectronic Ru(IV/III) and Ru(III/II) redox pairs in the heterogeneous system. A carbon felt modified electrode containing complex 4 (C-felt/poly-4) has been evaluated as a heterogeneous catalyst in the epoxidation of various olefin substrates using PhI(OAc)2 as an oxidant, displaying TON values of several thousands in all cases and good selectivity for the epoxide product.
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Affiliation(s)
- Mohamed Dakkach
- Departament de Química i Serveis Tècnics de Recerca, Universitat de Girona, Campus de Montilivi, E-17071 Girona, Spain.
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14
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Hu WT, Zhu LG. Synthesis, structures, and catalytic oxidation of three aqua-coordinated and oxo-bridged diruthenium(III) complexes with sulfobenzoate and 2,2′-bipyridine. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.824076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Wen-Ting Hu
- a Department of Chemistry , Zhejiang University , Hangzhou , P.R. China
| | - Long-Guan Zhu
- a Department of Chemistry , Zhejiang University , Hangzhou , P.R. China
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15
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Dakkach M, Atlamsani A, Parella T, Fontrodona X, Romero I, Rodríguez M. New Aqua N-Heterocyclic Carbene Ru(II) Complexes with Two-Electron Process as Selective Epoxidation Catalysts: An Evaluation of Geometrical and Electronic Effects. Inorg Chem 2013; 52:5077-87. [DOI: 10.1021/ic302863h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Mohamed Dakkach
- Departament de Química i Serveis Tècnics de Recerca, Universitat de Girona, Campus de Montilivi, E-17071
Girona, Spain
- Laboratoire
des Matériaux et Systèmes Interfaciaux, Département
de Chimie, Faculté des Sciences,
B.P. 2121, 93000 Tétouan, Morocco
| | - Ahmed Atlamsani
- Laboratoire
des Matériaux et Systèmes Interfaciaux, Département
de Chimie, Faculté des Sciences,
B.P. 2121, 93000 Tétouan, Morocco
| | - Teodor Parella
- Departament de Química i Servei de RMN, Universitat Autònoma de Barcelona, Cerdanyola
del Vallès, E-08193 Barcelona, Spain
| | - Xavier Fontrodona
- Departament de Química i Serveis Tècnics de Recerca, Universitat de Girona, Campus de Montilivi, E-17071
Girona, Spain
| | - Isabel Romero
- Departament de Química i Serveis Tècnics de Recerca, Universitat de Girona, Campus de Montilivi, E-17071
Girona, Spain
| | - Montserrat Rodríguez
- Departament de Química i Serveis Tècnics de Recerca, Universitat de Girona, Campus de Montilivi, E-17071
Girona, Spain
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Vaquer L, Riente P, Sala X, Jansat S, Benet-Buchholz J, Llobet A, Pericàs MA. Molecular ruthenium complexes anchored on magnetic nanoparticles that act as powerful and magnetically recyclable stereospecific epoxidation catalysts. Catal Sci Technol 2013. [DOI: 10.1039/c2cy20616a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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