1
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Cheng QY, Wang T, Hu J, Chen HY, Xu JJ. In Situ Probing the Short-Lived Intermediates in Visible-Light Heterogeneous Photocatalysis by Mass Spectrometry. Anal Chem 2023; 95:14150-14157. [PMID: 37665645 DOI: 10.1021/acs.analchem.3c03494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2023]
Abstract
Visible-light-mediated heterogeneous photocatalysis has recently emerged as an environmentally friendly and energy-sustainable alternative for organic transformations. Despite the advancements in developing wide varieties of photocatalysts during the past decades, the accurate probing and identification of the photogenerated species, especially the short-lived radical intermediates, are still challenging. In this work, we reported a hybrid ion emitter that integrated with a pico-liter heterogeneous photocatalytic reactor, which was fabricated by depositing the photocatalyst (e.g., TiO2) into the front tip of a quartz micropipette. Benefited from the dual-function feature of the hybrid micropipette (i.e., a clog-free tip-confined pico-liter reactor for heterogeneous photocatalysis and an ion emitter for nanoelectrospray ionization), sensitized photoredox reactions at the catalyst-solution interface can be triggered upon visible-light irradiation using a cheap LED laser (453 nm), and the newly produced transient radical intermediates can be rapidly transformed into gaseous ions for mass spectrometric identification. Using this novel low-delay coupling device, photogenerated intermediates, including the cationic radicals produced during the photooxidation of anilines and the anionic radicals produced during the photoreduction of quinones, were successfully captured by mass spectrometry. We believe that our hybrid photochemical microreactor/ion emitter has provided a new and powerful tool for exploring the complicated heterogeneous photochemical processes, especially their ultrafast initial transformations.
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Affiliation(s)
- Qiu-Yue Cheng
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Ting Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Jun Hu
- School of Life Sciences and Health Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Hong-Yuan Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Jing-Juan Xu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
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2
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He Z, Moreno JA, Swain M, Wu J, Kwon O. Aminodealkenylation: Ozonolysis and copper catalysis convert C(sp 3)-C(sp 2) bonds to C(sp 3)-N bonds. Science 2023; 381:877-886. [PMID: 37616345 PMCID: PMC10753956 DOI: 10.1126/science.adi4758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 07/25/2023] [Indexed: 08/26/2023]
Abstract
Great efforts have been directed toward alkene π bond amination. In contrast, analogous functionalization of the adjacent C(sp3)-C(sp2) σ bonds is much rarer. Here we report how ozonolysis and copper catalysis under mild reaction conditions enable alkene C(sp3)-C(sp2) σ bond-rupturing cross-coupling reactions for the construction of new C(sp3)-N bonds. We have used this unconventional transformation for late-stage modification of hormones, pharmaceutical reagents, peptides, and nucleosides. Furthermore, we have coupled abundantly available terpenes and terpenoids with nitrogen nucleophiles to access artificial terpenoid alkaloids and complex chiral amines. In addition, we applied a commodity chemical, α-methylstyrene, as a methylation reagent to prepare methylated nucleosides directly from canonical nucleosides in one synthetic step. Our mechanistic investigation implicates an unusual copper ion pair cooperative process.
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Affiliation(s)
- Zhiqi He
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
| | - Jose Antonio Moreno
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
| | - Manisha Swain
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
| | - Jason Wu
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
| | - Ohyun Kwon
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
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3
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Structures, Binding and Clustering Energies of Cu2+(MeOH)n=1-8 Clusters and Temperature Effects : A DFT Study. Polyhedron 2023. [DOI: 10.1016/j.poly.2023.116343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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4
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Da-yang TE, Fifen JJ, Conradie J, Conradie MM. Structures, temperature effect, binding and clustering energies of Cu2+(MeOH)n=1-8 clusters and extrapolations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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Gemeda FT, Vorobyev V, Tarnovsky AN. Ultrafast Solution-Phase Photophysical and Photochemical Dynamics of Hexaiodobismuthate(III), the Heart of Bismuth Halide Perovskite Solar Cells. J Phys Chem B 2022; 126:1254-1267. [PMID: 35118867 DOI: 10.1021/acs.jpcb.1c10350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ultrafast relaxation pathways in a hexaiodide bismuth(III) complex, BiI63-, excited at 530 nm in acetonitrile solution are studied by means of femtosecond transient absorption spectroscopy supported by steady-state absorption/emission measurements and DFT computations. Radiationless relaxation out of the Franck-Condon, largely metal-centered (MC) triply degenerate 3T1u state (46 ± 19 fs), is driven by vibronic coupling due to the Jahn-Teller effect in the excited state. The relaxation populates two lower-energy states: a ligand-to-metal charge transfer (LMCT) excited state of 3π I(5pπ) → Bi(6p) nature and a luminescent "trap" 3A1u(3P0) MC state. Coherent population transfer from the initial 3T1u into the 3π LMCT state occurs in an oscillatory, stepwise manner at ∼190 and ∼550 fs with a population ratio of ∼4:1. The 3π LMCT state decays with a 2.9 ps lifetime, yielding two short-lived reaction intermediates of which the first one reforms the parent ground state with a 15 ps time constant, and the second one decays on a ∼5 ps timescale generating the triplet product species, which persists to the longest 2 ns delay times investigated. This product is identified as the η2 metal-ligated diiodide-bismuth adduct with the intramolecularly formed I-I bond, [(η2-I2)Bi(II)I4]3-, which is the species of interest for solar energy conversion and storage applications. The lifetime of the "trap" 3A1u state is estimated to be 13 ns from the photoluminescence quenching of BiI63-. The findings give insight into the excited-state relaxation dynamics and the photochemical reaction mechanisms in halide complexes of heavy ns2 metal ions.
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Affiliation(s)
- Firew T Gemeda
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Vasily Vorobyev
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Alexander N Tarnovsky
- Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
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6
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Wang C, Fan W, Li Z, Xiong J, Zhang W, Wang Z. Sonochemistry-assisted photocontrolled atom transfer radical polymerization enabled by manganese carbonyl. Polym Chem 2022. [DOI: 10.1039/d2py00682k] [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
Sonochemistry-assisted photocontrolled atom transfer radical polymerization (SAP-ATRP) is developed to circumvent the problem caused by the low penetration depth of light.
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Affiliation(s)
- Chen Wang
- Frontiers Science Center for Flexible Electronics & Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, Xi'an 710072, China
| | - Wenru Fan
- Frontiers Science Center for Flexible Electronics & Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, Xi'an 710072, China
| | - Zexuan Li
- Frontiers Science Center for Flexible Electronics & Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, Xi'an 710072, China
| | - Jiaqiang Xiong
- Department of Obstetrics and Gynecology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Wei Zhang
- Department of Obstetrics and Gynecology, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Zhenhua Wang
- Frontiers Science Center for Flexible Electronics & Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, Xi'an 710072, China
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7
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Yang Q, Wang YH, Qiao Y, Gau M, Carroll PJ, Walsh PJ, Schelter EJ. Photocatalytic C-H activation and the subtle role of chlorine radical complexation in reactivity. Science 2021; 372:847-852. [PMID: 34016778 DOI: 10.1126/science.abd8408] [Citation(s) in RCA: 106] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 01/14/2021] [Accepted: 04/13/2021] [Indexed: 12/24/2022]
Abstract
The functionalization of methane, ethane, and other alkanes derived from fossil fuels is a central goal in the chemical enterprise. Recently, a photocatalytic system comprising [CeIVCl5(OR)]2- [CeIV, cerium(IV); OR, -OCH3 or -OCCl2CH3] was disclosed. The system was reportedly capable of alkane activation by alkoxy radicals (RO•) formed by CeIV-OR bond photolysis. In this work, we present evidence that the reported carbon-hydrogen (C-H) activation of alkanes is instead mediated by the photocatalyst [NEt4]2[CeCl6] (NEt4 +, tetraethylammonium), and RO• are not intermediates. Spectroscopic analyses and kinetics were investigated for C-H activation to identify chlorine radical (Cl•) generation as the rate-limiting step. Density functional theory calculations support the formation of [Cl•][alcohol] adducts when alcohols are present, which can manifest a masked RO• character. This result serves as an important cautionary note for interpretation of radical trapping experiments.
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Affiliation(s)
- Qiaomu Yang
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Yu-Heng Wang
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Yusen Qiao
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Michael Gau
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Patrick J Carroll
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Patrick J Walsh
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA.
| | - Eric J Schelter
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA.
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8
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Trupp L, Bruttomesso AC, Eliseeva SV, Petoud S, Ramírez JA, Barja BC. A Six-Armed Phenhomazine Ligand with a Potential "Turn-Off" Copper(II) Sensing Capability through Terbium(III) Luminescence Quenching. Chemistry 2020; 26:12645-12653. [PMID: 32501589 DOI: 10.1002/chem.202002282] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Indexed: 01/22/2023]
Abstract
Herein, the design, synthesis, and characterization of a phenhomazine ligand are described. The ligand has six pendant acetate arms designed for the combined coordination of copper(II) and lanthanide(III) ions, with the perspective of developing a "turn-off" copper sensor. The key step for the ligand preparation was the one-step endomethylene bridge fission of a diamino Tröger's base with a concomitant alkylation. Fluorescence and absorption spectroscopies as well as nuclear magnetic resonance (NMR) experiments were performed to analyze and understand the coordination properties of the ligand. Transition metal coordination was driven by the synergistic effect of the free nitrogen atoms of the diazocinic core and the two central acetate arms attached to those nitrogen atoms, whereas lanthanide coordination is performed by the external acetate arms, presumably forming a self-assembled 2:2 metallosupramolecular structure. The terbium complex shows the typical green emission with narrow bands and long luminescence lifetimes. The luminescence quenching produced by the presence of copper(II) ions was analyzed. This work sets, therefore, a starting point for the development of a phenhomazine-based "turn-off" copper(II) sensor.
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Affiliation(s)
- Leandro Trupp
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de, Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Instituto de Química Física de los Materiales, Medio Ambiente y, Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Departamento de Química Orgánica, Facultad de, Ciencias Exactas y Naturales, Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica, (UMYMFOR), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Centre de Biophysique Moléculaire, Centre National de la, Recherche Scientifique (CNRS), UPR 4301, 45071, Orléans Cedex 2, France
| | - Andrea C Bruttomesso
- Departamento de Química Orgánica, Facultad de, Ciencias Exactas y Naturales, Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica, (UMYMFOR), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina
| | - Svetlana V Eliseeva
- Centre de Biophysique Moléculaire, Centre National de la, Recherche Scientifique (CNRS), UPR 4301, 45071, Orléans Cedex 2, France
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, Centre National de la, Recherche Scientifique (CNRS), UPR 4301, 45071, Orléans Cedex 2, France
| | - Javier A Ramírez
- Departamento de Química Orgánica, Facultad de, Ciencias Exactas y Naturales, Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica, (UMYMFOR), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina
| | - Beatriz C Barja
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de, Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Instituto de Química Física de los Materiales, Medio Ambiente y, Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina
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9
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Structural Features of 1,3,4-Thiadiazole-Derived Ligands and Their Zn(II) and Cu(II) Complexes Which Demonstrate Synergistic Antibacterial Effects with Kanamycin. Int J Mol Sci 2020; 21:ijms21165735. [PMID: 32785125 PMCID: PMC7461131 DOI: 10.3390/ijms21165735] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/03/2020] [Accepted: 08/07/2020] [Indexed: 12/15/2022] Open
Abstract
Classical synthetic protocols were applied for the isolation of three novel 1,3,4-thiadiazole derivatives which were then complexed with the biologically important Cu(II) and Zn(II) ions. All free ligands and their corresponding complexes were characterized using a number of spectroscopic techniques including Ultraviolet-visible (UV–vis), Fluorescence, Infrared (FT-IR), tandem liquid chromatography-mass (LC-MS), X-ray diffraction (XRD), and Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C, HSQC, HMBC). The results obtained are consistent with the formation of dihydrate complexes, in which the chelation of the metal ion occurs via one of the thiadiazole nitrogen atoms and the deprotonated hydroxyl group of the neighboring resorcynyl moiety. The Zn(II) complexes utilize a 1:1 ligand–metal ratio, while in the Cu(II) complexes the ligand–metal ratio is 2:1. Although the antibacterial testing identified moderate activity of the compounds against the tested bacterial strains and additionally modest antioxidant activity, a strong synergistic antibacterial effect against Staphylococcus aureus, using concomitant treatment of thiadiazole derivatives with the commercial antibiotic kanamycin, was observed. The most active thiadiazole derivative demonstrated a minimal inhibitory concentration (MIC) of 500 μg/mL while it was 125 μg/mL in the presence of kanamycin. Moreover, in the presence of few thiadiazole derivatives the MIC value of kanamycin decreased from 0.39 μg/mL to 0.5 μg/mL. The antioxidant activity (IC50) of the most active thiadiazole derivative was determined as 0.13 mM which was nearly three-fold lower compared to that of TROLOX (0.5 mM).
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10
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An Q, Wang Z, Chen Y, Wang X, Zhang K, Pan H, Liu W, Zuo Z. Cerium-Catalyzed C-H Functionalizations of Alkanes Utilizing Alcohols as Hydrogen Atom Transfer Agents. J Am Chem Soc 2020; 142:6216-6226. [PMID: 32181657 DOI: 10.1021/jacs.0c00212] [Citation(s) in RCA: 104] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Modern photoredox catalysis has traditionally relied upon metal-to-ligand charge-transfer (MLCT) excitation of metal polypyridyl complexes for the utilization of light energy for the activation of organic substrates. Here, we demonstrate the catalytic application of ligand-to-metal charge-transfer (LMCT) excitation of cerium alkoxide complexes for the facile activation of alkanes utilizing abundant and inexpensive cerium trichloride as the catalyst. As demonstrated by cerium-catalyzed C-H amination and the alkylation of hydrocarbons, this reaction manifold has enabled the facile use of abundant alcohols as practical and selective hydrogen atom transfer (HAT) agents via the direct access of energetically challenging alkoxy radicals. Furthermore, the LMCT excitation event has been investigated through a series of spectroscopic experiments, revealing a rapid bond homolysis process and an effective production of alkoxy radicals, collectively ruling out the LMCT/homolysis event as the rate-determining step of this C-H functionalization.
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Affiliation(s)
- Qing An
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.,University of Chinese Academy of Science, Shanghai 100049, China
| | - Ziyu Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.,University of Chinese Academy of Science, Shanghai 100049, China
| | - Yuegang Chen
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Xin Wang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.,University of Chinese Academy of Science, Shanghai 100049, China
| | - Kaining Zhang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.,University of Chinese Academy of Science, Shanghai 100049, China
| | - Hui Pan
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.,University of Chinese Academy of Science, Shanghai 100049, China
| | - Weimin Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.,STU & SIOM Joint Laboratory for Superintense Lasers and the Applications, Shanghai 201210, China
| | - Zhiwei Zuo
- School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.,State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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11
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Swain A, Cho B, Gautam R, Curtis CJ, Tomat E, Huxter V. Ultrafast Dynamics of Tripyrrindiones in Solution Mediated by Hydrogen-Bonding Interactions. J Phys Chem B 2019; 123:5524-5535. [DOI: 10.1021/acs.jpcb.9b01916] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Alicia Swain
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Byungmoon Cho
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Ritika Gautam
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Clayton J. Curtis
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Elisa Tomat
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Vanessa Huxter
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
- Department of Physics, University of Arizona, Tucson, Arizona 85721, United States
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12
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Mereshchenko AS, Myasnikova OS, Panov MS, Kochemirovsky VA, Skripkin MY, Budkina DS, Tarnovsky AN. Solvent Effects on Nonradiative Relaxation Dynamics of Low-Energy Ligand-Field Excited States: A CuCl 42- Complex. J Phys Chem B 2017; 121:4562-4568. [PMID: 28384409 DOI: 10.1021/acs.jpcb.7b02015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nonradiative relaxation dynamics of CuCl42- complexes photoexcited into the highest-energy ligand-field electronic state (2A1) is studied in acetonitrile, dichloromethane, and chloroform solvents, as well as in acetonitrile-water and in acetonitrile-deuterated water mixtures. Due to ultrafast internal conversion, this excited state directly converts to the electronic ground state in dichloromethane and chloroform. The nonradiative relaxation constant is similar in anhydrous acetonitrile. Addition of water to acetonitrile solutions efficiently quenches the excited ligand-field 2A1 state. The quenching is proposed to be due to the diffusion-controlled formation of an electronically excited pentacoordinated [CuCl4H2O]2- encounter complex or a short-lived exciplex of similar structure, in which the electronic excitation energy transfers into the O-H stretch of the coordinated H2O molecule. This is followed by the dissociation of the pentacoordinated species, resulting in the reformation of the ground-state CuCl42- and free H2O molecules.
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Affiliation(s)
- Andrey S Mereshchenko
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Olesya S Myasnikova
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Maxim S Panov
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | | | - Mikhail Yu Skripkin
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
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13
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Karcz D, Matwijczuk A, Boroń B, Creaven B, Fiedor L, Niewiadomy A, Gagoś M. Isolation and spectroscopic characterization of Zn(II), Cu(II), and Pd(II) complexes of 1,3,4-thiadiazole-derived ligand. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.08.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Mereshchenko AS, Olshin PK, Myasnikova OS, Panov MS, Kochemirovsky VA, Skripkin MY, Moroz PN, Zamkov M, Tarnovsky AN. Ultrafast Photochemistry of Copper(II) Monochlorocomplexes in Methanol and Acetonitrile by Broadband Deep-UV-to-Near-IR Femtosecond Transient Absorption Spectroscopy. J Phys Chem A 2016; 120:1833-44. [PMID: 26901567 DOI: 10.1021/acs.jpca.5b12509] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photochemistry of copper(II) monochlorocomplexes in methanol and acetonitrile solutions is studied by UV-pump/broadband deep-UV-to-near-IR probe femtosecond transient absorption spectroscopy. Upon 255 and 266 nm excitation, the complexes in acetonitrile and methanol, respectively, are promoted to the excited ligand-to-metal charge transfer (LMCT) state, which has a short (sub-250 fs) lifetime. From the LMCT state, the complexes decay via internal conversion to lower-lying ligand field (LF) d-d excited states or the vibrationally hot ground electronic state. A minor fraction of the excited complexes relaxes to the LF electronic excited states, which are relatively long-lived with lifetimes >1 ns. Also, in methanol solutions, about 3% of the LMCT-excited copper(II) monochlorocomplexes dissociate forming copper(I) solvatocomplexes and chlorine atoms, which then further react forming long-lived photoproducts. In acetonitrile, about 50% of the LMCT-excited copper(II) monochlorocomplexes dissociate forming radical and ionic products in a ratio of 3:2. Another minor process observed following excitation only in methanol solutions is the re-equilibration between several forms of the copper(II) ground-state complexes present in solutions. This re-equilibration occurs on a time scale from sub-nanoseconds to nanoseconds.
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Affiliation(s)
- Andrey S Mereshchenko
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | - Pavel K Olshin
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | - Olesya S Myasnikova
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | - Maxim S Panov
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | | | - Mikhail Yu Skripkin
- Saint-Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
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15
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Le Person A, Siampiringue M, Sarakha M, Moncomble A, Cornard JP. The photo-degradation of mesotrione, a triketone herbicide, in the presence of Cu II ions. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.09.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kochemirovsky VA, Skripkin MY, Tveryanovich YS, Mereshchenko AS, Gorbunov AO, Panov MS, Tumkin II, Safonov SV. Laser-induced copper deposition from aqueous and aqueous–organic solutions: state of the art and prospects of research. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4535] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mereshchenko AS, Olshin PK, Karabaeva KE, Panov MS, Wilson RM, Kochemirovsky VA, Skripkin MY, Tveryanovich YS, Tarnovsky AN. Mechanism of Formation of Copper(II) Chloro Complexes Revealed by Transient Absorption Spectroscopy and DFT/TDDFT Calculations. J Phys Chem B 2015; 119:8754-63. [PMID: 26079181 DOI: 10.1021/acs.jpcb.5b03889] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Copper(II) complexes are extremely labile with typical ligand exchange rate constants on the order of 10(6)-10(9) M(-1) s(-1). As a result, it is often difficult to identify the actual formation mechanism of these complexes. In this work, using UV-vis transient absorption when probing in a broad time range (20 ps to 8 μs) in conjunction with DFT/TDDFT calculations, we studied the dynamics and underlying reaction mechanisms of the formation of extremely labile copper(II) CuCl4(2-) chloro complexes from copper(II) CuCl3(-) trichloro complexes and chloride ions. These two species, produced via photochemical dissociation of CuCl4(2-) upon 420 nm excitation into the ligand-to-metal-charge-transfer electronic state, are found to recombine into parent complexes with bimolecular rate constants of (9.0 ± 0.1) × 10(7) and (5.3 ± 0.4) × 10(8) M(-1) s(-1) in acetonitrile and dichloromethane, respectively. In dichloromethane, recombination occurs via a simple one-step addition. In acetonitrile, where [CuCl3](-) reacts with the solvent to form a [CuCl3CH3CN](-) complex in less than 20 ps, recombination takes place via ligand exchange described by the associative interchange mechanism that involves a [CuCl4CH3CN](2-) intermediate. In both solvents, the recombination reaction is potential energy controlled.
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Affiliation(s)
- Andrey S Mereshchenko
- †Institute of Chemistry, Saint-Petersburg State University, 198504 Saint-Petersburg, Russian Federation
| | - Pavel K Olshin
- †Institute of Chemistry, Saint-Petersburg State University, 198504 Saint-Petersburg, Russian Federation
| | - Kanykey E Karabaeva
- ‡Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Maxim S Panov
- †Institute of Chemistry, Saint-Petersburg State University, 198504 Saint-Petersburg, Russian Federation
| | - R Marshall Wilson
- ‡Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Vladimir A Kochemirovsky
- †Institute of Chemistry, Saint-Petersburg State University, 198504 Saint-Petersburg, Russian Federation
| | - Mikhail Yu Skripkin
- †Institute of Chemistry, Saint-Petersburg State University, 198504 Saint-Petersburg, Russian Federation
| | - Yury S Tveryanovich
- †Institute of Chemistry, Saint-Petersburg State University, 198504 Saint-Petersburg, Russian Federation
| | - Alexander N Tarnovsky
- ‡Department of Chemistry and the Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States
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Photochemistry of copper(II) chlorocomplexes in acetonitrile: Trapping the ligand-to-metal charge transfer excited state relaxations pathways. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.10.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ciftci M, Tasdelen MA, Yagci Y. Sunlight induced atom transfer radical polymerization by using dimanganese decacarbonyl. Polym Chem 2014. [DOI: 10.1039/c3py01009k] [Citation(s) in RCA: 132] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Golubeva EN, Zubanova EM, Melnikov MY, Gostev FE, Shelaev IV, Nadtochenko VA. Femtosecond spectroscopy and TD-DFT calculations of CuCl42− excited states. Dalton Trans 2014; 43:17820-7. [DOI: 10.1039/c4dt01409j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Photoinduced processes of tetrahexylammonium tetrachlorocuprate [(C6H13)4N]2CuIICl4 in chloro-organic solvents were investigated by steady state photolysis and femtosecond transient absorption spectroscopy, as well as TD-DFT calculations of excited terms.
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Affiliation(s)
| | | | | | | | | | - Victor A. Nadtochenko
- Moscow, Russia
- Moscow, Russia
- Moscow Institute of Physics and Technology State University 9 Institutskiy per
- , Russian Federation
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