1
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Insights into Molecular Structure of Pterins Suitable for Biomedical Applications. Int J Mol Sci 2022; 23:ijms232315222. [PMID: 36499560 PMCID: PMC9737128 DOI: 10.3390/ijms232315222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/22/2022] [Accepted: 11/30/2022] [Indexed: 12/07/2022] Open
Abstract
Pterins are an inseparable part of living organisms. Pterins participate in metabolic reactions mostly as tetrahydropterins. Dihydropterins are usually intermediates of these reactions, whereas oxidized pterins can be biomarkers of diseases. In this review, we analyze the available data on the quantum chemistry of unconjugated pterins as well as their photonics. This gives a comprehensive overview about the electronic structure of pterins and offers some benefits for biomedicine applications: (1) one can affect the enzymatic reactions of aromatic amino acid hydroxylases, NO synthases, and alkylglycerol monooxygenase through UV irradiation of H4pterins since UV provokes electron donor reactions of H4pterins; (2) the emission properties of H2pterins and oxidized pterins can be used in fluorescence diagnostics; (3) two-photon absorption (TPA) should be used in such pterin-related infrared therapy because single-photon absorption in the UV range is inefficient and scatters in vivo; (4) one can affect pathogen organisms through TPA excitation of H4pterin cofactors, such as the molybdenum cofactor, leading to its detachment from proteins and subsequent oxidation; (5) metal nanostructures can be used for the UV-vis, fluorescence, and Raman spectroscopy detection of pterin biomarkers. Therefore, we investigated both the biochemistry and physical chemistry of pterins and suggested some potential prospects for pterin-related biomedicine.
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2
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Agarwal RG, Coste SC, Groff BD, Heuer AM, Noh H, Parada GA, Wise CF, Nichols EM, Warren JJ, Mayer JM. Free Energies of Proton-Coupled Electron Transfer Reagents and Their Applications. Chem Rev 2021; 122:1-49. [PMID: 34928136 DOI: 10.1021/acs.chemrev.1c00521] [Citation(s) in RCA: 126] [Impact Index Per Article: 42.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We present an update and revision to our 2010 review on the topic of proton-coupled electron transfer (PCET) reagent thermochemistry. Over the past decade, the data and thermochemical formalisms presented in that review have been of value to multiple fields. Concurrently, there have been advances in the thermochemical cycles and experimental methods used to measure these values. This Review (i) summarizes those advancements, (ii) corrects systematic errors in our prior review that shifted many of the absolute values in the tabulated data, (iii) provides updated tables of thermochemical values, and (iv) discusses new conclusions and opportunities from the assembled data and associated techniques. We advocate for updated thermochemical cycles that provide greater clarity and reduce experimental barriers to the calculation and measurement of Gibbs free energies for the conversion of X to XHn in PCET reactions. In particular, we demonstrate the utility and generality of reporting potentials of hydrogenation, E°(V vs H2), in almost any solvent and how these values are connected to more widely reported bond dissociation free energies (BDFEs). The tabulated data demonstrate that E°(V vs H2) and BDFEs are generally insensitive to the nature of the solvent and, in some cases, even to the phase (gas versus solution). This Review also presents introductions to several emerging fields in PCET thermochemistry to give readers windows into the diversity of research being performed. Some of the next frontiers in this rapidly growing field are coordination-induced bond weakening, PCET in novel solvent environments, and reactions at material interfaces.
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Affiliation(s)
- Rishi G Agarwal
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Scott C Coste
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Benjamin D Groff
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Abigail M Heuer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Hyunho Noh
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Giovanny A Parada
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.,Department of Chemistry, The College of New Jersey, Ewing, New Jersey 08628, United States
| | - Catherine F Wise
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Eva M Nichols
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Jeffrey J Warren
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - James M Mayer
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
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3
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Kojima T. Study on Proton-Coupled Electron Transfer in Transition Metal Complexes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takahiko Kojima
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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4
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Abstract
High-valent oxocobalt(IV) species have been invoked as key intermediates in oxidative catalysis, but investigations into the chemistry of proton-coupled redox reactions of such species have been limited. Herein, the reactivity of an established water oxidation catalyst, [Co4O4(OAc)4(py)4][PF6], toward H-atom abstraction reactions is described. Mechanistic analyses and density functional theory (DFT) calculations support a concerted proton-electron transfer (CPET) pathway in which the high energy intermediates formed in stepwise pathways are bypassed. Natural bond orbital (NBO) calculations point to cooperative donor-acceptor σ interactions at the transition state, whereby the H-atom of the substrate is transferred to an orbital delocalized over a Co3(μ3-O) fragment. The mechanistic insights provide design principles for the development of catalytic C-H activation processes mediated by a multimetallic oxo metal cluster.
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5
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Ishizuka T, Itogawa M, Shimomura H, Shiota Y, Kotani H, Yoshizawa K, Kojima T. Redox properties of a bipyrimidine-bridged dinuclear ruthenium(II) complex. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.108150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Kotani H, Shimomura H, Ikeda K, Ishizuka T, Shiota Y, Yoshizawa K, Kojima T. Mechanistic Insight into Concerted Proton-Electron Transfer of a Ru(IV)-Oxo Complex: A Possible Oxidative Asynchronicity. J Am Chem Soc 2020; 142:16982-16989. [PMID: 32924508 DOI: 10.1021/jacs.0c05738] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have thoroughly investigated the oxidation of benzyl alcohol (BA) derivatives by a RuIV(O) complex (RuIV(O)) in the absence or presence of Brønsted acids in order to elucidate the proton-coupled electron-transfer (PCET) mechanisms in C-H oxidation on the basis of a kinetic analysis. Oxidation of BA derivatives by RuIV(O) without acids proceeded through concerted proton-electron transfer (CPET) with a large kinetic isotope effect (KIE). In contrast, the oxidation of 3,4,5-trimethoxy-BA ((MeO)3-BA) by RuIV(O) was accelerated by the addition of acids, in which the KIE value reached 1.1 with TFA (550 mM), indicating an alteration of the PCET mechanism from CPET to stepwise electron transfer (ET) followed by proton transfer (PT). Although the oxidized products of BA derivatives were confirmed to be the corresponding benzaldehydes in the range of acid concentrations (0-550 mM), a one-electron-reduction potential of RuIV(O) was positively shifted with increases in the concentrations of acids. The elevated reduction potential of RuIV(O) strongly influenced the PCET mechanisms in the oxidation of (MeO)3-BA, changing the mechanism from CPET to ET/PT, as evidenced by the driving-force dependence of logarithms of reaction rate constants in light of the Marcus theory of ET. In addition, dependence of activation parameters on acid concentrations suggested that an oxidative asynchronous CPET, which is not an admixture of the CPET and ET/PT mechanisms, is probably operative in the boundary region (0 mM < [TFA] < 50 mM) involving a one-proton-interacted RuIV(O)···H+ as a dominant reactive species.
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Affiliation(s)
- Hiroaki Kotani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba and CREST (JST), 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Hinatsu Shimomura
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba and CREST (JST), 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Kei Ikeda
- Institute for Materials Chemistry and Engineering, Kyushu University and CREST (JST), Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
| | - Tomoya Ishizuka
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba and CREST (JST), 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering, Kyushu University and CREST (JST), Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University and CREST (JST), Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
| | - Takahiko Kojima
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba and CREST (JST), 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
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7
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Dutta M, Bania KK, Pratihar S. A Remote 'Imidazole'-Based Ruthenium(II) Para-Cymene Pre-catalyst for the Selective Oxidation Reaction of Alkyl Arenes and Alcohols. Chem Asian J 2020; 15:926-932. [PMID: 32031753 DOI: 10.1002/asia.201901760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 01/21/2020] [Indexed: 11/12/2022]
Abstract
Herein we disclosed the use of a remote 'imidazole'-based precatalyst [(para-cymene)RuII (L)Cl]+ , C-1 where L=2-(4-substituted-phenyl)-1H-imidazo[4,5-f][1,10] phenanthroline) for the selective oxidation of a variety of alkyl arenes/heteroarenes and alcohols to their corresponding aldehydes or ketones in presence of tert-butyl hydroperoxide (TBHP). The remote 'imidazole' moiety present in the complex facilitates the activation of oxidant and subsequent generation of active species via the release of para-cymene from C-1, which in-turn was less effective without the 'imidazole' moiety. The mechanistic features of C-1 promoted oxidation of alkyl arenes were also assessed from spectroscopic, kinetic, and few control experiments. The substrate scope for C-1 promoted oxidation reaction was assessed based on the selective oxidation of 27-different alkyl arenes/heteroarenes and 25 different alcohols to their corresponding aldehydes/ketones in moderate to good yields.
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Affiliation(s)
- Manali Dutta
- Department of Chemical Sciences, Tezpur University, Napaam, Assam, 784028, India
| | - Kusum K Bania
- Department of Chemical Sciences, Tezpur University, Napaam, Assam, 784028, India
| | - Sanjay Pratihar
- Department of Chemical Sciences, Tezpur University, Napaam, Assam, 784028, India.,Inorganic Materials and Catalysis Division, CSIR-Central Salt and Marine Chemical Research Institute, G. B. Marg, Bhavnagar, Gujarat, 364002, India
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8
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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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9
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Han Q, Guo XX, Zhou XT, Ji HB. Efficient selective oxidation of alcohols to carbonyl compounds catalyzed by Ru-terpyridine complexes with molecular oxygen. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2019.107544] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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Kojima T. Development of functionality of metal complexes based on proton-coupled electron transfer. Dalton Trans 2020; 49:7284-7293. [DOI: 10.1039/d0dt00898b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Proton-coupled electron transfer (PCET) is ubiquitous and fundamental in many kinds of redox reactions. In this paper, are described PCET reactions in metal complexes to highlight their useful and unique properties and functionalities.
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Affiliation(s)
- Takahiko Kojima
- Department of Chemistry
- Faculty of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
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11
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Shinomiya R, Araki H, Momotake A, Kotani H, Kojima T, Yamamoto Y. Identification of Intermediates in Peroxidase Catalytic Cycle of a DNAzyme Possessing Heme. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190157] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ryosuke Shinomiya
- Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Haruka Araki
- Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Atsuya Momotake
- Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Hiroaki Kotani
- Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Takahiko Kojima
- Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Yasuhiko Yamamoto
- Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
- Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
- Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
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12
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Dutta M, Bania KK, Pratihar S. Remote ‘Imidazole’ Based Ruthenium(II)
p
‐Cymene Precatalyst for Selective Oxidative Cleavage of C−C Multiple Bonds. ChemCatChem 2019. [DOI: 10.1002/cctc.201900242] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Manali Dutta
- Department of Chemical SciencesTezpur University, Napaam Assam-784028 India
| | - Kusum Kumar Bania
- Department of Chemical SciencesTezpur University, Napaam Assam-784028 India
| | - Sanjay Pratihar
- Department of Chemical SciencesTezpur University, Napaam Assam-784028 India
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13
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Wang JX, Zhou XT, Han Q, Guo XX, Liu XH, Xue C, Ji HB. Efficient and selective oxidation of alcohols to carbonyl compounds at room temperature by a ruthenium complex catalyst and hydrogen peroxide. NEW J CHEM 2019. [DOI: 10.1039/c9nj04393d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
An efficient system comprising a ruthenium complex and hydrogen peroxide was developed for the oxidation of various primary and secondary alcohols at room temperature.
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Affiliation(s)
- Jie-Xiang Wang
- School of Chemical Engineering
- Guangdong University of Petrochemical Technology
- Maoming 515000
- P. R. China
| | - Xian-Tai Zhou
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Zhuhai 519082
- P. R. China
| | - Qi Han
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Zhuhai 519082
- P. R. China
| | - Xiao-Xuan Guo
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Zhuhai 519082
- P. R. China
| | - Xiao-Hui Liu
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Zhuhai 519082
- P. R. China
| | - Can Xue
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Zhuhai 519082
- P. R. China
| | - Hong-Bing Ji
- School of Chemical Engineering
- Guangdong University of Petrochemical Technology
- Maoming 515000
- P. R. China
- Fine Chemical Industry Research Institute
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14
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Kotani H, Shimomura H, Horimoto M, Ishizuka T, Shiota Y, Yoshizawa K, Yanagisawa S, Kawahara-Nakagawa Y, Kubo M, Kojima T. Fundamental electron-transfer and proton-coupled electron-transfer properties of Ru(iv)-oxo complexes. Dalton Trans 2019; 48:13154-13161. [DOI: 10.1039/c9dt02734c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reorganization energies (λ) of electron transfer (ET) and proton-coupled ET (PCET) from electron donors to isolated RuIV(O) complexes were determined to be in the range of 1.70–1.88 eV (ET) and 1.20–1.26 eV (PCET).
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Affiliation(s)
- Hiroaki Kotani
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Hinatsu Shimomura
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Momoka Horimoto
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Tomoya Ishizuka
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering
- Kyushu University
- Fukuoka 819-0395
- Japan
| | | | | | - Minoru Kubo
- Graduate School of Life Science
- University of Hyogo
- Hyogo 678-1297
- Japan
| | - Takahiko Kojima
- Department of Chemistry
- Graduate School of Pure and Applied Sciences
- University of Tsukuba and CREST (JST)
- Tsukuba
- Japan
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15
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Kotani H, Kaida S, Ishizuka T, Mieda K, Sakaguchi M, Ogura T, Shiota Y, Yoshizawa K, Kojima T. Importance of the Reactant-State Potentials of Chromium(V)–Oxo Complexes to Determine the Reactivity in Hydrogen-Atom Transfer Reactions. Inorg Chem 2018; 57:13929-13936. [DOI: 10.1021/acs.inorgchem.8b02453] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Hiroaki Kotani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Suzue Kaida
- 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
| | - Kaoru Mieda
- Graduate School of Life Science, University of Hyogo, Kouto, Hyogo 678-1297, Japan
| | - Miyuki Sakaguchi
- Graduate School of Life Science, University of Hyogo, Kouto, Hyogo 678-1297, Japan
| | - Takashi Ogura
- Graduate School of Life Science, University of Hyogo, Kouto, Hyogo 678-1297, 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
- Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Nishi-ku, Kyoto 615-8520, 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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16
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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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17
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Li J, Banerjee A, Preston DR, Shay BJ, Adhikary A, Sevilla MD, Loloee R, Staples RJ, Chavez FA. Thermally Induced Oxidation of [Fe II(tacn) 2](OTf) 2 (tacn = 1,4,7-triazacyclononane). Eur J Inorg Chem 2017; 2017:5529-5535. [PMID: 30416372 PMCID: PMC6221196 DOI: 10.1002/ejic.201701190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Indexed: 12/12/2022]
Abstract
We previously reported the spin-crossover (SC) properties of [FeII(tacn)2](OTf)2 (1) (tacn = 1,4,7-triazacyclononane) [Eur. J. Inorg. Chem. 2013, 2115]. Upon heating under dynamic vacuum, 1 undergoes oxidation to generate a low spin iron(III) complex. The oxidation of the iron center was found to be facilitated by initial oxidation of the ligand via loss of an H atom. The resulting complex was hypothesized to have the formulation [FeIII(tacn)(tacn-H)](OTf)2 (2) where tacn-H is N-deprotonated tacn. The formulation was confirmed by ESI-MS. The powder EPR spectrum of the oxidized product at 77 K reveals the formation of a low-spin iron(III) species with rhombic spectrum (g = 1.98, 2.10, 2.19). We have indirectly detected H2 formation during the heating of 1 by reacting the headspace with HgO. Formation of water (1HNMR in anhydrous d6-DMSO) and elemental mercury were observed. To further support this claim, we independently synthesized [FeIII(tacn)2](OTf)3 (3) and treated it with one equiv base yielding 2. The structures of 3 was characterized by X-ray crystallography. Compound 2 also exhibits a low spin iron(III) rhombic signal (g = 1.97, 2.11, 2.23) in DMF at 77 K. Variable temperature magnetic susceptibility measurements indicate that 3 undergoes gradual spin increase from 2 to 400 K. DFT studies indicate that the deprotonated nitrogen in 2 forms a bond to iron(III) exhibiting double bond character (Fe-N, 1.807 Å).
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Affiliation(s)
- Jia Li
- Department of Chemistry, Oakland University, Rochester, MI 48309-4477, USA
| | - Atanu Banerjee
- Department of Chemistry, Oakland University, Rochester, MI 48309-4477, USA
| | - Debra R Preston
- Department of Chemistry, Oakland University, Rochester, MI 48309-4477, USA
| | - Brian J Shay
- Biomedical Mass Spectrometry Facility, University of Michigan, Ann Arbor, MI 48109-0632, USA
| | - Amitiva Adhikary
- Department of Chemistry, Oakland University, Rochester, MI 48309-4477, USA
| | - Michael D Sevilla
- Department of Chemistry, Oakland University, Rochester, MI 48309-4477, USA
| | - Reza Loloee
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI, 48824-1322, USA
| | - Richard J Staples
- Department of Chemistry, Michigan State University, East Lansing, MI 48824-1044, USA
| | - Ferman A Chavez
- Department of Chemistry, Oakland University, Rochester, MI 48309-4477, USA
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Uraguchi D, Torii M, Ooi T. Acridinium Betaine as a Single-Electron-Transfer Catalyst: Design and Application to Dimerization of Oxindoles. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00265] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Masahiro Torii
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Takashi Ooi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Applied
Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
- CREST,
Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464-8601, Japan
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Ishizuka T, Kotani H, Kojima T. Characteristics and reactivity of ruthenium–oxo complexes. Dalton Trans 2016; 45:16727-16750. [DOI: 10.1039/c6dt03024f] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this perspective, we have surveyed the synthetic procedure, characteristics, and reactivity of high-valent ruthenium–oxo complexes.
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Affiliation(s)
| | - Hiroaki Kotani
- Department of Chemistry
- University of Tsukuba
- Tsukuba
- Japan
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