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Wang X, Li J, Kou M, Dou W, Bai D, Tang X, Tang Y, Liu W. Dual-Function Precious-Metal-Free Metal-Organic Framework for Photocatalytic Conversion and Chemical Fixation of Carbon Dioxide. Inorg Chem 2023; 62:19015-19024. [PMID: 37919966 DOI: 10.1021/acs.inorgchem.3c02765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2023]
Abstract
Highly efficient transformation of carbon dioxide (CO2) into value-added chemicals is considered a promising route for clean production and future energy sustainability, which is crucial for realizing a carbon-neutral economy. It remains a great challenge to develop highly stable and active catalysts with low-cost, environmentally friendly, and nontoxic materials for catalytic conversion of CO2. Herein, a precious-metal-free and heterogeneous MOF (LTG-FeZr) catalyst, composed of bis(terpyridine)iron(II) complexes and zirconium(IV) ions, was designed and prepared via a metalloligand approach. LTG-FeZr, with a robust framework and regular 1D channels not only can achieve the photocatalytic reduction of CO2 to HCOOH with a high conversion rate (up to 265 μmol·g-1·h-1) under visible-light irradiation but also exhibits exceptional catalytic activities toward the synthesis of cyclic carbonates via cycloaddition reactions of various epoxides and CO2 in the absence of light. Possible mechanisms for two different conversion processes of CO2 catalyzed by LTG-FeZr have been proposed. LTG-FeZr represents an ideal dual-function MOF platform for the catalytic conversion and utilization of CO2 in all weather conditions.
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Affiliation(s)
- Xiaoli Wang
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- College of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810016, China
| | - Jingzhe Li
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Manchang Kou
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Wei Dou
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Dongjie Bai
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Xiaoliang Tang
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- College of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810016, China
- Academy of Plateau Science and Sustainability, People's Government of Qinghai Province & Beijing Normal University, Xining 810016, China
| | - Yu Tang
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Weisheng Liu
- MOE Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Engineering Research Center of Rare Earth Functional Materials, Ministry of Education, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- College of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810016, China
- Academy of Plateau Science and Sustainability, People's Government of Qinghai Province & Beijing Normal University, Xining 810016, China
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2
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Fan F, Zhao L, Zeng Q, Zhang L, Zhang X, Wang T, Fu Y. Self-Catalysis Transformation of Metal-Organic Coordination Polymers. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37473422 DOI: 10.1021/acsami.3c07521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
Designing a multidimensional transformation of metal-organic coordination polymers (MOPs) is highly attractive yet very challenging. Herein, by combining the dynamicity of the coordination bond with the controllability of the chemical reaction, the concept of self-catalysis transformation of MOPs is first proposed. It uses the metal in MOPs as the catalyst to catalyze the chemical reaction of the ligand in the frameworks, simultaneously changing the coordination environment of the metal and the structure of the ligand, resulting in the controllable multidimensional transformation in the morphology and structure of MOPs. The self-catalysis transformation of MOPs can be triggered by heat or light, and crystals with various morphologies and structures can be obtained. Significantly, because the self-catalysis reaction is constraint in the framework, the products at different transformation processes are relatively stable. Monitoring and characterizing the transformation of MOPs give evidences for the exploration of the self-catalysis reaction, and a plausible transformation mechanism is proposed and proved. It can be foreseen that this novel self-catalysis transformation strategy might open up a new direction for the diverse development of MOPs and provide a powerful tool for the study of organic reaction mechanism.
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Affiliation(s)
- Fuqiang Fan
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Lin Zhao
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Qingqi Zeng
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Liying Zhang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Xuemin Zhang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Tieqiang Wang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
| | - Yu Fu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China
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3
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Zhu W, Sharma N, Lee YM, El-Khouly ME, Fukuzumi S, Nam W. Use of Singlet Oxygen in the Generation of a Mononuclear Nonheme Iron(IV)-Oxo Complex. Inorg Chem 2023; 62:4116-4123. [PMID: 36862977 DOI: 10.1021/acs.inorgchem.2c04020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
Nonheme iron(III)-superoxo intermediates are generated in the activation of dioxygen (O2) by nonheme iron(II) complexes and then converted to iron(IV)-oxo species by reacting with hydrogen donor substrates with relatively weak C-H bonds. If singlet oxygen (1O2) with ca. 1 eV higher energy than the ground state triplet oxygen (3O2) is employed, iron(IV)-oxo complexes can be synthesized using hydrogen donor substrates with much stronger C-H bonds. However, 1O2 has never been used in generating iron(IV)-oxo complexes. Herein, we report that a nonheme iron(IV)-oxo species, [FeIV(O)(TMC)]2+ (TMC = tetramethylcyclam), is generated using 1O2, which is produced with boron subphthalocyanine chloride (SubPc) as a photosensitizer, and hydrogen donor substrates with relatively strong C-H bonds, such as toluene (BDE = 89.5 kcal mol-1), via electron transfer from [FeII(TMC)]2+ to 1O2, which is energetically more favorable by 0.98 eV, as compared with electron transfer from [FeII(TMC)]2+ to 3O2. Electron transfer from [FeII(TMC)]2+ to 1O2 produces an iron(III)-superoxo complex, [FeIII(O2)(TMC)]2+, followed by abstracting a hydrogen atom from toluene by [FeIII(O2)(TMC)]2+ to form an iron(III)-hydroperoxo complex, [FeIII(OOH)(TMC)]2+, that is further converted to the [FeIV(O)(TMC)]2+ species. Thus, the present study reports the first example of generating a mononuclear nonheme iron(IV)-oxo complex with the use of singlet oxygen, instead of triplet oxygen, and a hydrogen atom donor with relatively strong C-H bonds. Detailed mechanistic aspects, such as the detection of 1O2 emission, the quenching by [FeII(TMC)]2+, and the quantum yields, have also been discussed to provide valuable mechanistic insights into understanding nonheme iron-oxo chemistry.
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Affiliation(s)
- Wenjuan Zhu
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Namita Sharma
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Yong-Min Lee
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Mohamed E El-Khouly
- Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology, New Borg El-Arab 21934, Alexandria, Egypt
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Wonwoo Nam
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Korea
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4
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Monsour CG, Decosto CM, Tafolla-Aguirre BJ, Morales LA, Selke M. Singlet Oxygen Generation, Quenching, and Reactivity with Metal Thiolates. Photochem Photobiol 2021; 97:1219-1240. [PMID: 34242405 DOI: 10.1111/php.13487] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 07/08/2021] [Indexed: 11/28/2022]
Abstract
Metal thiolate complexes can act as photosensitizers for the generation of singlet oxygen, quenchers of singlet oxygen, and they may undergo chemical reactions with singlet oxygen leading to oxidized thiolate ligands. This review covers all of the chemical reactions of thiolate ligands with singlet oxygen (through early 2021). Since some of these reactions are self-sensitized photooxidations, singlet oxygen generation by metal complexes is also discussed. Mechanistic features such as the effects of protic vs. aprotic conditions are presented and compared with the comparatively well-understood photooxidation of organic sulfides. In general, the total rate of singlet oxygen removal correlates with the nucleophilicity of the thiolate ligand which in turn can be influenced by the metal. Some interesting patterns of reactivity have been noted as a result of this survey: Metal thiolate complexes bearing arylthiolate ligands appear to exclusively produce sulfinate (metal-bound sulfone) products upon reaction with singlet oxygen. In contrast, metal thiolate complexes bearing alkylthiolate ligands may produce sulfinate and/or sulfenate (metal-bound sulfoxide) products. Several mechanistic pathways have been proposed for these reactions, but the exact nature of any intermediates remains unknown at this time.
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Affiliation(s)
- Charlotte G Monsour
- Department of Chemistry and Biochemistry, California State University, Los Angeles
| | - Cassandra M Decosto
- Department of Chemistry and Biochemistry, California State University, Los Angeles
| | | | - Luis A Morales
- Department of Chemistry and Biochemistry, California State University, Los Angeles
| | - Matthias Selke
- Department of Chemistry and Biochemistry, California State University, Los Angeles
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5
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Cao M, Zhu J, Zhi Z, Ye B, Yao S, Zhang X. Thermodynamic Resolution of Pharmaceutical Precursor Modafinil Acid on the Basis of
Chiral‐at‐Metal
Strategy. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202000729] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Man‐Li Cao
- Department of Chemistry, Guangdong University of Education Guangzhou Guangdong 510303 China
| | - Jun‐Ling Zhu
- Department of Chemistry, Guangdong University of Education Guangzhou Guangdong 510303 China
| | - Zhong‐Lan Zhi
- Department of Chemistry, Guangdong University of Education Guangzhou Guangdong 510303 China
| | - Bao‐Hui Ye
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat‐sen University Guangzhou Guangdong 510275 China
| | - Su‐Yang Yao
- Department of Chemistry, Guangdong University of Education Guangzhou Guangdong 510303 China
| | - Xiu‐Lian Zhang
- Department of Chemistry, Guangdong University of Education Guangzhou Guangdong 510303 China
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Aguirre-Araque JS, Guimaraes RR, Toma HE. Chemistry of ternary monocarboxyterpyridine-bipyridine-trimercaptotriazine ruthenium complexes and application in dye sensitized solar cells. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114513] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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7
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Gómez A, Jara G, Flores E, Maldonado T, Godoy F, Muñoz-Osses M, Vega A, Mera R, Silva C, Pavez J. Synthesis of mono/dinuclear rhenium(i) tricarbonyl substituted with 4-mercaptopyridine related ligands: spectral and theoretical evidence of thiolate/thione interconversion. NEW J CHEM 2020. [DOI: 10.1039/d0nj02328k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
κ1-S complexes show solvent-mediated tautomerism. The S–S bridge cleavage in κ1-N derivatives is attributed to the presence of a proton source.
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Affiliation(s)
- Alejandra Gómez
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Geraldine Jara
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Erick Flores
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Tamara Maldonado
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Fernando Godoy
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Michelle Muñoz-Osses
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Andrés Vega
- Departamento de Ciencias Químicas
- Facultad de Ciencias Exactas
- Universidad Andrés Bello
- Viña del Mar
- Chile
| | - Raul Mera
- Departamento de Ciencias del Ambiente
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Carlos Silva
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
| | - Jorge Pavez
- Departamento de Química de los Materiales
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Chile
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8
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Yasuda J, Inoue K, Mizuno K, Arai S, Uehara K, Kikuchi A, Yan YN, Yamanishi K, Kataoka Y, Kato M, Kawai A, Kawamoto T. Photooxidation Reactions of Cyclometalated Palladium(II) and Platinum(II) Complexes. Inorg Chem 2019; 58:15720-15725. [PMID: 31718162 DOI: 10.1021/acs.inorgchem.9b01492] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New C,N,S-cyclometalated palladium(II) and platinum(II) complexes have been synthesized and their structural, electrochemical, and photochemical properties examined. The blue color of these complexes in solution changed to yellow under visible-light irradiation. By measurement of the absorption spectra for quantifying changes in color, isosbestic points for each complex clearly indicated the presence of only two species responsible for the change of color. X-ray analysis revealed that the visible-light-induced yellow species were S-oxygenated sulfinato complexes. Photosensitized generation of singlet oxygen (1O2) was confirmed by the direct detection of singlet oxygen luminescence at 1275 nm. The present cyclometalated palladium(II) and platinum(II) complexes are efficient photosensitizers of singlet oxygen, which rapidly reacts with coordinating sulfur atoms.
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Affiliation(s)
- Jun Yasuda
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Keisuke Inoue
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Koichi Mizuno
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Shiho Arai
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Koushi Uehara
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Asumi Kikuchi
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Yin-Nan Yan
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Katsunori Yamanishi
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
| | - Yusuke Kataoka
- Department of Material Science, Interdisciplinary Graduate School of Science and Engineering , Shimane University , 1060 Nishikawatsu , Matsue 690-8504 , Japan
| | - Mai Kato
- Department of Chemistry , Tokyo Institute of Technology , 2-12-1 Ohokayama, Meguro-ku , Tokyo 152-8551 , Japan
| | - Akio Kawai
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan.,Department of Chemistry , Tokyo Institute of Technology , 2-12-1 Ohokayama, Meguro-ku , Tokyo 152-8551 , Japan
| | - Tatsuya Kawamoto
- Department of Chemistry, Faculty of Science , Kanagawa University , 2946 Tsuchiya , Hiratsuka 259-1293 , Japan
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9
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Yin S, Wang X, Jiang J, Xiao H, Li X. Synthesis of terpyridine-containing Pd(II) complexes and evaluation of their catalytic activity. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.126925] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Li LP, Peng HL, Ye BH. Thermodynamic Resolution and Enantioselective Synthesis of C2-Symmetric Bis-sulfoxides Based on Chiral Iridium(III) Complexes. Inorg Chem 2019; 58:12245-12253. [PMID: 31483628 DOI: 10.1021/acs.inorgchem.9b01682] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enantiopure Λ-[Ir(dfppy)2(MeCN)2](PF6) and Δ-[Ir(dfppy)2(MeCN)2](PF6) (where dfppy is (4,6-difluoropheny)pyridine) were demonstrated to preferentially react with (S,S)-1,2-bis(arylsulfinyl)ethane and (R,R)-1,2-bis(arylsulfinyl)ethane, respectively, under thermodynamic equilibrium. Sequential treatment of Λ-[Ir(dfppy)2(MeCN)2](PF6) and Δ-[Ir(dfppy)2(MeCN)2](PF6) with C2-symmetric bis-sulfoxides led to diastereoselective formation of the corresponding diastereomers Λ-[Ir(dfppy)2(R,R)-bis-sulfoxide)](PF6) in 90-92% and Δ-[Ir(dfppy)2(S,S)-bis-sulfoxide)](PF6) in 88-90%, respectively. The uncoordinated (R,S)-bis-sulfoxides were afforded in 45% with >97% de values. Enantiopure (S,S)-bis-sulfoxides and (R,R)-bis-sulfoxides were respectively obtained by the release of sulfoxide ligands from the corresponding complexes in the presence of glycine in yields of 20-21% with 97-99% ee values. The enantioreceptors Λ-[Ir(dfppy)2(MeCN)2](PF6) and Δ-[Ir(dfppy)2(MeCN)2](PF6) can be recycled and reused in the next reaction cycle. Moreover, a protocol for asymmetric oxidation of prochiral bis-sulfide into enantiopure C2 symmetric bis-sulfoxide was also developed in a high enantioselectivity. The absolute configurations at the metal centers and sulfur atoms were determined by X-ray crystallography.
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Affiliation(s)
- Li-Ping Li
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry , Sun Yat-sen University , Guangzhou 510275 , China
| | - He-Long Peng
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry , Sun Yat-sen University , Guangzhou 510275 , China
| | - Bao-Hui Ye
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry , Sun Yat-sen University , Guangzhou 510275 , China
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11
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Cagan DA, Garcia AC, Li K, Ashen-Garry D, Tadle AC, Zhang D, Nelms KJ, Liu Y, Shallenberger JR, Stapleton JJ, Selke M. Chemistry of Singlet Oxygen with a Cadmium-Sulfur Cluster: Physical Quenching versus Photooxidation. J Am Chem Soc 2019; 141:67-71. [PMID: 30575375 DOI: 10.1021/jacs.8b10516] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigated the chemistry of singlet oxygen with a cadmium-sulfur cluster, (Me4N)2[Cd4(SPh)10]. This cluster was used as a model for cadmium-sulfur nanoparticles. Such nanoparticles are often used in conjunction with photosensitizers (for singlet oxygen generation or dye-sensitized solar cells), and hence, it is important to determine if cadmium-sulfur moieties physically quench and/or chemically react with singlet oxygen. We found that (Me4N)2[Cd4(SPh)10] is indeed a very strong quencher of singlet oxygen with total rate constants for 1O2 removal of (5.8 ± 1.3) × 108 M-1 s-1 in acetonitrile and (1.2 ± 0.5) × 108 M-1 s-1 in CD3OD. Physical quenching predominates, but chemical reaction leading to decomposition of the cluster and formation of sulfinate is also significant, with a rate constant of (4.1 ± 0.6) × 106 M-1 s-1 in methanol. Commercially available cadmium-sulfur quantum dots ("lumidots") show similar singlet oxygen quenching rate constants, based on the molar concentration of the quantum dots.
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Affiliation(s)
- David A Cagan
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - Arman C Garcia
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - Kin Li
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - David Ashen-Garry
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - Abegail C Tadle
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - Dong Zhang
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - Katherine J Nelms
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - Yangyang Liu
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
| | - Jeffrey R Shallenberger
- Materials Characterization Laboratory , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Joshua J Stapleton
- Materials Characterization Laboratory , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Matthias Selke
- Department of Chemistry and Biochemistry , California State University , Los Angeles , California 90032 , United States
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