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Oszajca M, Nitek W, Rafalska-Łasocha A, Pamin K, Połtowicz J, Łasocha W. Synthesis, crystal structure and selected properties of three new 4-propylanilinium polyoxomolybdates. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Sławińska A, Tyszka-Czochara M, Serda P, Oszajca M, Ruggiero-Mikołajczyk M, Pamin K, Napruszewska BD, Prochownik E, Łasocha W. New Organic-Inorganic Hybrid Compounds Based on Sodium Peroxidomolybdates (VI) and Derivatives of Pyridine Acids: Structure Determination and Catalytic Properties. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5976. [PMID: 36079356 PMCID: PMC9457328 DOI: 10.3390/ma15175976] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 08/24/2022] [Accepted: 08/26/2022] [Indexed: 06/15/2023]
Abstract
Two organic-inorganic hybrids based on sodium peroxidomolybdates(VI) and 3,5-dicarboxylic pyridine acid (Na-35dcpa) or N-oxide isonicotinic acid (Na-isoO) have been synthesized and characterized. All compounds contain inorganic parts: a pentagonal bipyramid with molybdenum center, and an organic part containing 3,5-dicarboxylic pyridine acid or N-oxide isonicotinic acid moieties. The type of organic part used in the synthesis influences the crystal structure of obtained compounds. This aspect can be interesting for crystal engineering. Crystal structures were determined using powder X-ray diffraction or single crystal diffraction for compounds Na-35dcpa and Na-isoO, respectively. Elemental analysis was used to check the purity of the obtained compounds, while X-ray Powder Diffraction (XRPD) vs. temp. was applied to verify their stability. Moreover, all the compounds were examined by Infrared (IR) spectroscopy. Their catalytic activity was tested in the Baeyer-Villiger (BV) oxidation of cyclohexanone to ε-caprolactone in the oxygen-aldehyde system. The highest catalytic activity in the BV oxidation was observed for Na-35dcpa. The compounds were also tested for biological activity on human normal cells (fibroblasts) and colon cancer cell lines (HT-29, LoVo, SW 620, HCT 116). All compounds were cytotoxic against tumor cells with metastatic characteristics, which makes them interesting and promising candidates for further investigations of specific anticancer mechanisms.
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Affiliation(s)
- Adrianna Sławińska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
| | | | - Paweł Serda
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Marcin Oszajca
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Małgorzata Ruggiero-Mikołajczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
| | - Katarzyna Pamin
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
| | - Bogna D. Napruszewska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
| | - Ewelina Prochownik
- Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland
| | - Wiesław Łasocha
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
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Cherkashinin G, Eilhardt R, Nappini S, Cococcioni M, Píš I, Dal Zilio S, Bondino F, Marzari N, Magnano E, Alff L. Energy Level Alignment at the Cobalt Phosphate/Electrolyte Interface: Intrinsic Stability vs Interfacial Chemical Reactions in 5 V Lithium Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2022; 14:543-556. [PMID: 34932299 DOI: 10.1021/acsami.1c16296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The intrinsic stability of the 5 V LiCoPO4-LiCo2P3O10 thin-film (carbon-free) cathode material coated with MoO3 thin layer is studied using a comprehensive synchrotron electron spectroscopy in situ approach combined with first-principle calculations. The atomic-molecular level study demonstrates fully reversible electronic properties of the cathode after the first electrochemical cycle. The polyanionic oxide is not involved in chemical reactions with the fluoroethylene-containing liquid electrolyte even when charged to 5.1 V vs Li+/Li. The high stability of the cathode is explained on the basis of the developed energy level model. In contrast, the chemical composition of the cathode-electrolyte interface evolves continuously by involving MoO3 in the decomposition reaction with consequent leaching of oxide from the surface. The proposed mechanisms of chemical reactions are attributed to external electrolyte oxidation via charge transfer from the relevant electron level to the MoO3 valence band state and internal electrolyte oxidation via proton transfer to the solvents. This study provides a deeper insight into the development of both a doping strategy to enhance the electronic conductivity of high-voltage cathode materials and an efficient surface coating against unfavorable interfacial chemical reactions.
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Affiliation(s)
- Gennady Cherkashinin
- Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 2, D-64287 Darmstadt, Germany
| | - Robert Eilhardt
- Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 2, D-64287 Darmstadt, Germany
| | - Silvia Nappini
- IOM CNR Laboratorio TASC, Strada Statale 14, km 163,5 in Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Matteo Cococcioni
- Physics Department, University of Pavia, Via Bassi 6, I-27100 Pavia, Italy
| | - Igor Píš
- IOM CNR Laboratorio TASC, Strada Statale 14, km 163,5 in Area Science Park, 34149 Basovizza, Trieste, Italy
- Elettra─Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy
| | - Simone Dal Zilio
- IOM CNR Laboratorio TASC, Strada Statale 14, km 163,5 in Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Federica Bondino
- IOM CNR Laboratorio TASC, Strada Statale 14, km 163,5 in Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Nicola Marzari
- Theory and Simulation of Materials (THEOS), and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Elena Magnano
- IOM CNR Laboratorio TASC, Strada Statale 14, km 163,5 in Area Science Park, 34149 Basovizza, Trieste, Italy
- Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, Johannesburg, South Africa
| | - Lambert Alff
- Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 2, D-64287 Darmstadt, Germany
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Sławińska A, Tyszka-Czochara M, Serda P, Oszajca M, Ruggiero-Mikołajczyk M, Pamin K, Karcz R, Łasocha W. Newly-Obtained Two Organic-Inorganic Hybrid Compounds Based on Potassium Peroxidomolybdate and Dicarboxypyridinic Acid: Structure Determination, Catalytic Properties, and Cytotoxic Effects of Eight Peroxidomolybdates in Colon and Hepatic Cancer Cells. MATERIALS (BASEL, SWITZERLAND) 2021; 15:ma15010241. [PMID: 35009389 PMCID: PMC8746204 DOI: 10.3390/ma15010241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/22/2021] [Accepted: 12/23/2021] [Indexed: 05/03/2023]
Abstract
Two new organic-inorganic hybrid compounds containing dicarboxylic pyridine acids have been obtained and characterized. Both compounds are potassium oxidodiperoxidomolybdates with 2,6-dicarboxylicpyridine acid or 3,5-dicarboxylicpyridine acid moieties, respectively. The chemical formula for the first one is C14H7K3Mo2N2O18 denoted as K26dcpa, the second C7H4K1Mo1N1O11.5-K35dcpa. Their crystal structures were determined using single crystal (K26dcpa) or XRPD-X-ray powder diffraction techniques (K35dcpa). The purity of the compounds was confirmed by elemental analysis. Their thermal stability was determined with the use of non-ambient XRPD. In addition, they were examined by IR spectroscopy methods and catalytic activity studies were performed for them. Catalytic tests in the Baeyer-Villiger reaction and biological activity have been performed for eight compounds: K26dcpa, K35dcpa, and six peroxidomolybdates previously obtained by our group. The anti-proliferative activity of peroxidomolybdenum compounds after 24 h of incubation was studied in vitro against three selected human tumor cell lines (SW620, LoVo, HEP G2) and normal human cells (fibroblasts). The data were expressed as IC50 values. The structure of the investigated oxodiperoxomolybdenum compounds was shown to have influence on the biological activity and catalytic properties. It has been shown that the newly-obtained compound, K35dcpa, is a very efficient catalyst in the Baeyer-Villiger reaction. The best biological activity results were obtained for Na-picO (previously obtained by us), which is a very effective anti-cancer agent towards SW 620 colorectal adenocarcinoma cells.
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Affiliation(s)
- Adrianna Sławińska
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland; (A.S.); (M.R.-M.); (K.P.); (R.K.)
| | | | - Paweł Serda
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (P.S.); (M.O.)
| | - Marcin Oszajca
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (P.S.); (M.O.)
| | - Małgorzata Ruggiero-Mikołajczyk
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland; (A.S.); (M.R.-M.); (K.P.); (R.K.)
| | - Katarzyna Pamin
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland; (A.S.); (M.R.-M.); (K.P.); (R.K.)
| | - Robert Karcz
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland; (A.S.); (M.R.-M.); (K.P.); (R.K.)
| | - Wiesław Łasocha
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland; (A.S.); (M.R.-M.); (K.P.); (R.K.)
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland; (P.S.); (M.O.)
- Correspondence:
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SBA-15 Supported Silver Catalyst for the Efficient Aerobic Oxidation of Toluene Under Solvent-Free Conditions. Catal Letters 2021. [DOI: 10.1007/s10562-021-03845-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Annušová A, Bodík M, Hagara J, Kotlár M, Halahovets Y, Mičušík M, Chlpík J, Cirák J, Hofbauerová M, Jergel M, Majková E, Šiffalovič P. On the extraction of MoO x photothermally active nanoparticles by gel filtration from a byproduct of few-layer MoS 2 exfoliation. NANOTECHNOLOGY 2020; 32:045708. [PMID: 33140739 DOI: 10.1088/1361-6528/abc035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Gel filtration is a versatile technique employed for biological molecules and nanoparticles, offering their reproducible classification based on size and shape. Colloidal nanoparticles are of significant interest in biomedical applications due to a large number of solution-based bioconjugation procedures. Nevertheless, the inherent polydispersity of the nanoparticles produced by various techniques necessitates the employment of high yield separation and purification techniques. Here we demonstrate the employment of gel filtration on non-stoichiometric plasmonic MoO x nanoparticles, prepared by an oxidation process during liquid-phase exfoliation of few-layer MoS2 nanosheets. This resulted in the separation of two types of MoO x particles, in the form of two different chromatographic fractions. They showed different sizes, morphological and optical properties. The fraction containing smaller particles with diameters of 1-4 nm, exhibited an increased absorbance peak in the near IR region and responded with a significant temperature increase to laser irradiation at the wavelength close to the maximal absorption. The fraction with the larger particles from 3 up to 10 nm, showed weak photoluminescence and a preferred orientation upon the deposition on a planar substrate. However, it had no absorbance in the near IR compared to the former fraction. According to our knowledge, this is the first time that the gel filtration was applied to the separation of molybdenum oxide nanomaterials. This step ensured the isolation of plasmonic MoO x nanoparticles suitable for further bioconjugation and target photothermal treatment.
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Affiliation(s)
- Adriana Annušová
- Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia. Centre for Advanced Material Application, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
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Diniz J, Nunes C, Monteiro O. Novel approach to synthesise MoO3-TiO2 nanocomposites for the photo-assisted oxidation of benzyl alcohol to benzaldehyde. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.108099] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Sławińska A, Serda P, Oszajca M, Pamin K, Połtowicz J, Łasocha W. Synthesis, crystal structure and selected properties of two new peroxidomolybdates. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Simple Hybrids Based on Mo or W Oxides and Diamines: Structure Determination and Catalytic Properties. Catal Letters 2020. [DOI: 10.1007/s10562-019-02935-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Abstract
Crystalline hybrid catalysts based on molybdenum or tungsten oxide and aliphatic diamines were synthesized via simple, eco-friendly reproducible methodologies, starting from commercially available and relatively inexpensive organic and inorganic precursors, and using water as solvent under mild conditions. The crystal structures of the obtained fine powdered solids were solved ab initio from powder X-ray diffraction data. The type of organic component (1,2-diaminoethane, 1,2-diaminopropane, 1,3-diaminopropane) may play a structure-directing role. On the other hand, different metals (M = Mo, W) may lead to isostructural one-dimensional hybrids of the type MO3(L) with the same bidentate diamine ligand L. The prepared catalysts were investigated for the liquid phase oxidation of saturated and unsaturated hydrocarbons (cis-cyclooctene, cyclooctane), using different types of oxidants (O2, H2O2, tert-butyl hydroperoxide). Differences in catalytic performances associated with distinct structural features were investigated.
Graphic Abstract
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10
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Kazemi M. Magnetically reusable nanocatalysts in biginelli synthesis of dihydropyrimidinones (DHPMs). SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1720740] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Mosstafa Kazemi
- Young Researchers and Elite Club, Islamic Azad University, Ilam, Iran
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11
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Nasibipour M, Safaei E, Wojtczak A, Jagličić Z, Galindo A, Masoumpour MS. A biradical oxo-molybdenum complex containing semiquinone and o-aminophenol benzoxazole-based ligands. RSC Adv 2020; 10:40853-40866. [PMID: 35519205 PMCID: PMC9059147 DOI: 10.1039/d0ra06351g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 10/16/2020] [Indexed: 12/27/2022] Open
Abstract
We report a new mononuclear molybdenum(iv) complex, MoOLBISLSQ, in which LSQ (2,4-di-tert-butyl o-semibenzoquinone ligand) has been prepared from the reaction of the o-iminosemibenzoquinone form of a tridentate non-innocent benzoxazole ligand, LBIS, and MoO2(acac)2. The complex was characterized by X-ray crystallography, elemental analysis, IR and UV-vis spectroscopy and magnetic susceptibility measurements. The crystal structure of MoOLBISLSQ revealed a distorted octahedral geometry around the metal centre, surrounded by one O and two N atoms of LBIS and two O atoms of LSQ. The effective magnetic moment (μeff) of MoOLBISLSQ decreased from 2.36 to 0.2 μB in the temperature range of 290 to 2 K, indicating a singlet ground state caused by antiferromagnetic coupling between the metal and ligand centred unpaired electrons. Also, the latter led to the EPR silence of the complex. Cyclic voltammetry (CV) studies indicate both ligand and metal-centered redox processes. MoOLBISLSQ was applied as a catalyst for the oxidative cleavage of cyclohexene to adipic acid and selective oxidation of sulfides to sulfones with aqueous hydrogen peroxide. Biradical molybdenum(iv) complex, MoOLBISLSQ, has been prepared from the reaction of the o-iminosemibenzoquinone form of a tridentate non-innocent benzoxazole ligand, LBIS, and MoO2(acac)2 and used as catalyst in oxidation reaction..![]()
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Affiliation(s)
- Mina Nasibipour
- Department of Chemistry
- College of Sciences
- Shiraz University
- Shiraz
- Iran
| | - Elham Safaei
- Department of Chemistry
- College of Sciences
- Shiraz University
- Shiraz
- Iran
| | - Andrzej Wojtczak
- Nicolaus Copernicus University
- Faculty of Chemistry
- 87-100 Torun
- Poland
| | - Zvonko Jagličić
- Institute of Mathematics
- Physics and Mechanics & Faculty of Civil and Geodetic Engineering
- University of Ljubljana
- Ljubljana
- Slovenia
| | - Agustín Galindo
- Departamento de Química Inorgánica
- Facultad de Química
- Universidad de Sevilla
- 41071 Sevilla
- Spain
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Pamin K, Tabor E, Górecka S, Kubiak WW, Rutkowska-Zbik D, Połtowicz J. Three Generations of Cobalt Porphyrins as Catalysts in the Oxidation of Cycloalkanes. CHEMSUSCHEM 2019; 12:684-691. [PMID: 30426703 DOI: 10.1002/cssc.201802198] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/09/2018] [Indexed: 06/09/2023]
Abstract
Three generations of cobalt porphyrins were synthesized, physicochemically characterized by FTIR and UV/Vis spectroscopy as well as cyclic voltammetry and applied as catalysts in the oxidation of cycloalkanes with atmospheric molecular oxygen under mild conditions. All examined catalysts were active in the tested reaction, and their catalytic activity varied with the nature and number of substituents on the porphyrin ring. Introduction of electron-withdrawing or electron-donating substituents at the porphyrin rings increases the activity of metalloporphyrin complexes. It was found, for the first time, that generation II cobalt porphyrins show higher activity in cycloalkane oxidation than cobalt porphyrins of generation III. The lower catalytic activity of generation III cobalt porphyrins can be attributed to the saddle-shaped deformation of the porphyrin macrocycle. DFT modeling of Co porphyrins and their interactions with molecular oxygen provided explanations for the observed effects. On the basis of prior reports and the obtained results, a reaction mechanism is proposed and discussed.
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Affiliation(s)
- Katarzyna Pamin
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Krakow, Poland
| | - Edyta Tabor
- J. Heyrovský Institute of Physical Chemistry of the CAS, Dolejškova 2155/3, 182 23, Praha, Czech Republic
| | - Sylwia Górecka
- Department of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Krakow, Poland
| | - Władysław W Kubiak
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059, Krakow, Poland
| | - Dorota Rutkowska-Zbik
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Krakow, Poland
| | - Jan Połtowicz
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239, Krakow, Poland
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Shul'pin GB, Vinogradov MM, Shul'pina LS. Oxidative functionalization of C–H compounds induced by the extremely efficient osmium catalysts (a review). Catal Sci Technol 2018. [DOI: 10.1039/c8cy00659h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In recent years, osmium complexes have found applications not only in thecis-hydroxylation of olefins but also very efficient in the oxygenation of C–H compounds (saturated and aromatic hydrocarbons and alcohols) by hydrogen peroxide as well as organic peroxides.
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Affiliation(s)
- Georgiy B. Shul'pin
- Semenov Institute of Chemical Physics
- Russian Academy of Sciences
- Moscow
- Russia
- Plekhanov Russian University of Economics
| | - Mikhail M. Vinogradov
- Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
| | - Lidia S. Shul'pina
- Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
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14
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Stereoselective Alkane Oxidation with meta-Chloroperoxybenzoic Acid (MCPBA) Catalyzed by Organometallic Cobalt Complexes. Molecules 2016; 21:molecules21111593. [PMID: 27879680 PMCID: PMC6273550 DOI: 10.3390/molecules21111593] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Revised: 11/15/2016] [Accepted: 11/16/2016] [Indexed: 01/21/2023] Open
Abstract
Cobalt pi-complexes, previously described in the literature and specially synthesized and characterized in this work, were used as catalysts in homogeneous oxidation of organic compounds with peroxides. These complexes contain pi-butadienyl and pi-cyclopentadienyl ligands: [(tetramethylcyclobutadiene)(benzene)cobalt] hexafluorophosphate, [(C4Me4)Co(C6H6)]PF6 (1); diiodo(carbonyl)(pentamethylcyclopentadienyl)cobalt, Cp*Co(CO)I2 (2); diiodo(carbonyl)(cyclopentadienyl)cobalt, CpCo(CO)I2 (3); (tetramethylcyclobutadiene)(dicarbonyl)(iodo)cobalt, (C4Me4)Co(CO)2I (4); [(tetramethylcyclobutadiene)(acetonitrile)(2,2′-bipyridyl)cobalt] hexafluorophosphate, [(C4Me4)Co(bipy)(MeCN)]PF6 (5); bis[dicarbonyl(B-cyclohexylborole)]cobalt, [(C4H4BCy)Co(CO)2]2 (6); [(pentamethylcyclopentadienyl)(iodo)(1,10-phenanthroline)cobalt] hexafluorophosphate, [Cp*Co(phen)I]PF6 (7); diiodo(cyclopentadienyl)cobalt, [CpCoI2]2 (8); [(cyclopentadienyl)(iodo)(2,2′-bipyridyl)cobalt] hexafluorophosphate, [CpCo(bipy)I]PF6 (9); and [(pentamethylcyclopentadienyl)(iodo)(2,2′-bipyridyl)cobalt] hexafluorophosphate, [Cp*Co(bipy)I]PF6 (10). Complexes 1 and 2 catalyze very efficient and stereoselective oxygenation of tertiary C–H bonds in isomeric dimethylcyclohexanes with MCBA: cyclohexanols are produced in 39 and 53% yields and with the trans/cis ratio (of isomers with mutual trans- or cis-configuration of two methyl groups) 0.05 and 0.06, respectively. Addition of nitric acid as co-catalyst dramatically enhances both the yield of oxygenates and stereoselectivity parameter. In contrast to compounds 1 and 2, complexes 9 and 10 turned out to be very poor catalysts (the yields of oxygenates in the reaction with cis-1,2-dimethylcyclohexane were only 5%–7% and trans/cis ratio 0.8 indicated that the oxidation is not stereoselective). The chromatograms of the reaction mixture obtained before and after reduction with PPh3 are very similar, which testifies that alkyl hydroperoxides are not formed in this oxidation. It can be thus concluded that the interaction of the alkanes with MCPBA occurs without the formation of free radicals. The complexes catalyze oxidation of alcohols with tert-butylhydroperoxide (TBHP). For example, tert-BuOOH efficiently oxidizes 1-phenylethanol to acetophenone in 98% yield if compound 1 is used as a catalyst.
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