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Wei S, Li K, Zhong S, Zhang R, Wang G, Liu R. Prussian Blue Analogue-Derived Co 3O 4 as Catalysts for Enhanced Selective Oxidation of Cyclohexane Using Molecular Oxygen. ACS Appl Mater Interfaces 2024; 16:7252-7264. [PMID: 38300279 DOI: 10.1021/acsami.3c17478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
Selective conversion of inert C-H bonds in alkanes into high-value-added functional groups (alcohols, ketones, carboxylic acids, etc.) plays a vital role in establishing a green and sustainable chemical industry. Catalytic selective oxidation of cyclohexane to KA oil (cyclohexanol and cyclohexanone) is a typical representative of alkane functionalization. In this work, hollow cage-like Co3O4 (Co3O4-C) and particle Co3O4 (Co3O4-P) were synthesized by calcining two types of Prussian blue analogues (PBAs), which were used to catalyze the selective oxidation of cyclohexane. The Co3O4-C predominantly exposed (311) crystal plane is easier to adsorb cyclohexane than Co3O4-P, which is beneficial to shorten the induction period, accelerate the reaction rate, and improve the conversion. Consequently, Co3O4-C displayed a 10% conversion of cyclohexane within 1 h, and the KA oil selectivity reached 90%. The Co3O4-P exposed (220) crystal plane has a higher molar percentage of oxygen vacancies and more active oxygen species, as well as a strong cyclohexanone adsorption capacity, which is conducive to the deep oxidation of cyclohexanone to adipic acid and other diacid products. The mechanism analysis of cyclohexane oxidation catalyzed by PBA-based Co3O4 shows that it exemplifies the feasibility to tailor the surface of catalysts by modulating the PBAs, which ultimately influences their reaction performance for accelerating the reaction and maintaining high cyclohexane conversion and KA oil selectivity.
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Affiliation(s)
- Shuang Wei
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, CAS, Beijing 100190, P. R. China
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, P. R. China
| | - Kexin Li
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, CAS, Beijing 100190, P. R. China
| | - Sheng Zhong
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, CAS, Beijing 100190, P. R. China
| | - Ruirui Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, CAS, Beijing 100190, P. R. China
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, P. R. China
| | - Guosheng Wang
- College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, P. R. China
| | - Ruixia Liu
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, CAS, Beijing 100190, P. R. China
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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2
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Kadam SA, Sandoval S, Bastl Z, Simkovičová K, Kvítek L, Jašík J, Olszówka JE, Valtera S, Vaidulych M, Morávková J, Sazama P, Kubička D, Travert A, van Bokhoven JA, Fortunelli A, Kleibert A, Kalbáč M, Vajda Š. Cyclohexane Oxidative Dehydrogenation on Graphene-Oxide-Supported Cobalt Ferrite Nanohybrids: Effect of Dynamic Nature of Active Sites on Reaction Selectivity. ACS Catal 2023; 13:13484-13505. [PMID: 37881789 PMCID: PMC10594591 DOI: 10.1021/acscatal.3c02592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 08/25/2023] [Indexed: 10/27/2023]
Abstract
In this work, we investigated cyclohexane oxidative dehydrogenation (ODH) catalyzed by cobalt ferrite nanoparticles supported on reduced graphene oxide (RGO). We aim to identify the active sites that are specifically responsible for full and partial dehydrogenation using advanced spectroscopic techniques such as X-ray photoelectron emission microscopy (XPEEM) and X-ray photoelectron spectroscopy (XPS) along with kinetic analysis. Spectroscopically, we propose that Fe3+/Td sites could exclusively produce benzene through full cyclohexane dehydrogenation, while kinetic analysis shows that oxygen-derived species (O*) are responsible for partial dehydrogenation to form cyclohexene in a single catalytic sojourn. We unravel the dynamic cooperativity between octahedral and tetrahedral sites and the unique role of the support in masking undesired active (Fe3+/Td) sites. This phenomenon was strategically used to control the abundance of these species on the catalyst surface by varying the particle size and the wt % content of the nanoparticles on the RGO support in order to control the reaction selectivity without compromising reaction rates which are otherwise extremely challenging due to the much favorable thermodynamics for complete dehydrogenation and complete combustion under oxidative conditions.
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Affiliation(s)
- Shashikant A. Kadam
- Department
of Nanocatalysis, J. Heyrovsky Institute
of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Stefania Sandoval
- Department
of Low Dimensional Systems, J. Heyrovsky
Institute of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Zdeněk Bastl
- Department
of Low Dimensional Systems, J. Heyrovsky
Institute of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Karolína Simkovičová
- Department
of Nanocatalysis, J. Heyrovsky Institute
of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
- Department
of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. Listopadu 12, 77900 Olomouc, Czech Republic
| | - Libor Kvítek
- Department
of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. Listopadu 12, 77900 Olomouc, Czech Republic
| | - Juraj Jašík
- Department
of Nanocatalysis, J. Heyrovsky Institute
of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Joanna Elżbieta Olszówka
- Department
of Nanocatalysis, J. Heyrovsky Institute
of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Stanislav Valtera
- Department
of Nanocatalysis, J. Heyrovsky Institute
of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
- Department
of Mathematics, Informatics and Cybernetics, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech Republic
| | - Mykhailo Vaidulych
- Department
of Nanocatalysis, J. Heyrovsky Institute
of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Jaroslava Morávková
- Department
of Structure and Dynamics in Catalysis, J. Heyrovsky Institute of Physical Chemistry of the Czech Academy
of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Petr Sazama
- Department
of Structure and Dynamics in Catalysis, J. Heyrovsky Institute of Physical Chemistry of the Czech Academy
of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - David Kubička
- Department
of Petroleum Technology and Alternative Fuels, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech
Republic
| | - Arnaud Travert
- Normandie
Univ., ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, 14000 Caen, France
| | | | | | - Armin Kleibert
- Swiss
Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Martin Kalbáč
- Department
of Low Dimensional Systems, J. Heyrovsky
Institute of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
| | - Štefan Vajda
- Department
of Nanocatalysis, J. Heyrovsky Institute
of Physical Chemistry of the Czech Academy of Sciences v.v.i, Dolejškova 3, 18223 Prague, Czech Republic
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Joaquin HF, Jaime PM, Rodrigo OT. Applying a Green Solvent with Microwave, Ultrasound, and Soxhlet Extraction Techniques to Quantify the Slip Additive cis-1,3-Docosenamide and Nine Oxidative Degradation Byproducts in Polypropylene Samples. Polymers (Basel) 2023; 15:3457. [PMID: 37631513 PMCID: PMC10458392 DOI: 10.3390/polym15163457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 08/15/2023] [Accepted: 08/16/2023] [Indexed: 08/27/2023] Open
Abstract
Erucamide is used as an important slip agent for polymers. However, erucamide can degrade during processing and long-term storage, forming various oxidation products. These degradation products can affect the recovery rates of erucamide. In this study, investigated different solid-liquid extraction methods (Soxhlet, microwave, and ultrasound) and used gas chromatography with mass spectrometry (GC-MS) to quantify erucamide and its degradation byproducts in polypropylene (PP). A multivariable experiment was designed, and a mixed-effect approach was used to analyze the results. Various extraction variables were examined, such as temperature, time, solvents, and PP pretreatments. Using a mixed-effect model with a Kenward-Roger approximation, an R2 of the model of 97% and p values of 0.168, 0.000, and 0.000 were obtained for the technical, solvent, and type of PP pretreatment variables, respectively. The highest average recoveries of erucamide were found with the microwave technique and were 96.4% using dichloromethane, 94.57% using cyclohexane, and 93.05% using limonene. With ultrasound, recoveries ranged between 85 and 92% for dichloromethane and limonene. In addition, it was observed that the extraction method had better recovery results in ground PP than in films and in pellets. Nine oxidative degradation byproducts of erucamide were identified and semi-quantified by GC-MS. The reaction mechanisms for forming each byproduct were proposed. The byproducts that experienced a higher rate of degradation of erucamide were erucamide with a hydroxyl group at position one and 12-amino-6-12-oxo-dodecanoic acid, showing more prominent peaks using the Soxhlet method with cyclohexane and dichloromethane as solvents and polypropylene (PP) films as the type of material used.
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Affiliation(s)
- Hernández Fernández Joaquin
- Chemistry Program, Department of Natural and Exact Sciences, San Pablo Campus, University of Cartagena, Cartagena 130015, Colombia
- Chemical Engineering Program, School of Engineering, Universidad Tecnológica de Bolivar, Parque Industrial y Tecnológico Carlos Vélez Pombo Km 1 Vía Turbaco, Cartagena 130001, Colombia
- Department of Natural and Exact Science, Universidad de la Costa, Barranquilla 080002, Colombia
| | - Pérez Mendoza Jaime
- Complex Fluid Engineering and Food Rheology Research Group (IFCRA), Food Engineering Department, Universidad de Cartagena, Cartagena de Indias 130015, Colombia;
| | - Ortega-Toro Rodrigo
- Food Packaging and Shelf-Life Research Group (FP&SL), Food Engineering Department, Universidad de Cartagena, Cartagena de Indias 130015, Colombia;
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Hilberath T, van Oosten R, Victoria J, Brasselet H, Alcalde M, Woodley JM, Hollmann F. Toward Kilogram-Scale Peroxygenase-Catalyzed Oxyfunctionalization of Cyclohexane. Org Process Res Dev 2023; 27:1384-1389. [PMID: 37496955 PMCID: PMC10367066 DOI: 10.1021/acs.oprd.3c00135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Indexed: 07/28/2023]
Abstract
Mol-scale oxyfunctionalization of cyclohexane to cyclohexanol/cyclohexanone (KA-oil) using an unspecific peroxygenase is reported. Using AaeUPO from Agrocybe aegerita and simple H2O2 as an oxidant, cyclohexanol concentrations of more than 300 mM (>60% yield) at attractive productivities (157 mM h-1, approx. 15 g L-1 h-1) were achieved. Current limitations of the proposed biooxidation system have been identified paving the way for future improvements and implementation.
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Affiliation(s)
- Thomas Hilberath
- Department
of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Remco van Oosten
- Department
of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629HZ Delft, The Netherlands
| | - Juliet Victoria
- Department
of Chemical and Biochemical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Hugo Brasselet
- Atlant.
Innov., Koornmarkt 52, 2611 EH Delft, The Netherlands
| | - Miguel Alcalde
- Department
of Biocatalysis, Institute of Catalysis,
CSIC, 28049 Madrid, Spain
| | - John M. Woodley
- Department
of Chemical and Biochemical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Frank Hollmann
- Department
of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629HZ Delft, The Netherlands
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5
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Alghamdi T, Aina PO, Rownaghi AA, Rezaei F. Influence of Interfering Ions and Adsorption Temperature on Radioactive Iodine Removal Efficiency and Stability of Ni-MOF-74 and Zr-UiO-66. ACS Appl Mater Interfaces 2023. [PMID: 37417685 DOI: 10.1021/acsami.3c05821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
Metal-organic frameworks (MOFs) often exhibit an exceptional adsorption-based separation performance for a variety of gases, ions, and liquids. While most radioactive iodine removal studies focus on the capture of radioactive iodine from off-gas streams, few studies have systematically investigated the effect of structure-property relationships of MOFs on iodine removal performance in the presence of interfering ions in liquid solutions. Herein, we investigated the iodide ion (I-) adsorption performance of two model MOFs (e.g., Ni-MOF-74 and Zr-UiO-66) in liquid phase as a function of iodine concentration (e.g., 0.125 to 0.25 and 0.50 mmol/L) and adsorption temperature (e.g., 25 to 40 and 60 °C), and in the presence of interfering ions such as Cl- and CO32- through batch-mode experiments. Under identical experimental conditions, Ni-MOF-74 outperformed Zr-UiO-66 in immobilizing iodine from the solution by achieving a maximum iodine removal efficiency of 97% at 60 °C. The results showed that the presence of other interfering ions marginally affects the iodine removal efficiency (e.g., capacity and rate of iodine capture) over both MOF adsorbents. The adsorption kinetics was found to be controlled by multiple transport processes encompassing external surface adsorption, intraparticle diffusion, and final equilibrium. Moreover, the leach test results revealed 8 and 12% iodine release from Ni-MOF-74 and Zr-UiO-66, respectively, at 25 °C after 48 h aging. This study establishes guiding principles for sustainable removal of iodine in the presence of Cl- and CO32- species in cyclohexane.
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Affiliation(s)
- Turki Alghamdi
- Linda and Bipin Doshi Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409-1230, United States
| | - Peter O Aina
- Linda and Bipin Doshi Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409-1230, United States
| | - Ali A Rownaghi
- Department of Chemistry, Cleveland State University, 2121 Euclid Ave., Cleveland, Ohio 44115, United States
| | - Fateme Rezaei
- Linda and Bipin Doshi Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409-1230, United States
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Rao S, Zheng Z, Yang C. Effect of Cyclohexane on the Combustion Characteristics of Multi-Component Gasoline Surrogate Fuels. Molecules 2023; 28:4273. [PMID: 37298749 PMCID: PMC10254882 DOI: 10.3390/molecules28114273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 05/16/2023] [Accepted: 05/20/2023] [Indexed: 06/12/2023] Open
Abstract
It has been discovered that there is a dynamic coupling between cycloalkanes and aromatics, which affects the number and types of radicals, thereby controlling the ignition and combustion of fuels. Therefore, it is necessary to analyze the effects of cyclohexane production in multicomponent gasoline surrogate fuels containing cyclohexane. In this study, a five-component gasoline surrogate fuel kinetic model containing cyclohexane was first verified. Then, the effect of cyclohexane addition on the ignition and combustion performance of the surrogate fuel was analyzed. This study shows that the five-component model exhibits good predictive performance for some real gasoline. Meanwhile, the addition of cyclohexane decreases the ignition-delay time of the fuel in the low and high temperature bands, which is caused by the early oxidation and decomposition of cyclohexane molecules, generating more OH radicals; in the medium temperature band, the isomerization and decomposition reactions of cyclohexane oxide cC6H12O2 dominate the temperature sensitivity of the ignition delay, affecting the small molecule reactions that promote the generation of reactive radicals such as OH, thus inhibiting the negative temperature coefficient behavior of the surrogate fuel. The laminar flame speed of the surrogate fuels increased with the increase in the proportion of cyclohexane. This is due to the fact that the laminar flame speed of cyclohexane is higher than that of chain and aromatic hydrocarbons, and the addition of cyclohexane dilutes the ratio of chain and aromatic hydrocarbons in the mixture. In addition, engine simulation studies have shown that at higher engine speeds, the five-component surrogate fuel containing cyclohexane requires lower intake-gas temperatures to achieve positive ignition and are closer to the in-cylinder ignition of real gasoline.
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Affiliation(s)
| | - Zhaolei Zheng
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China; (S.R.); (C.Y.)
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Wilkes TI. Ergosterol extraction: a comparison of methodologies. Access Microbiol 2023; 5:000490.v4. [PMID: 37223062 PMCID: PMC10202395 DOI: 10.1099/acmi.0.000490.v4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 02/17/2023] [Indexed: 05/25/2023] Open
Abstract
Ergosterol is a component of the cell membrane of mycorrhizal fungi and is frequently used to quantify their biomass. Arbuscular mycorrhizal (AM) fungi and ectomycorrhizal (ECM) fungi establish a symbiotic relationship with a respective host plant. Several methods are currently employed for quantification of ergosterol; however, these utilise a series of potentially hazardous chemicals with varying exposure times to the user. The present comparative study aims to ascertain the most reliable method to extract ergosterol whilst limiting hazard exposure to the user. Chloroform, cyclohexane, methanol and methanol hydroxide extraction protocols were applied to a total of 300 samples of root samples and a further 300 growth substrate samples across all protocols. Extracts were analysed via HPLC methodologies. Chromagraphic analysis showed chloroform-based extraction procedures produced a consistently higher concentration of ergosterol in both root and growth substrate samples. Methanol hydroxide, without the addition of cyclohexane, produced a very low concentration of ergosterol, with a reduction of quantified ergosterol of between 80 and 92 % compared to chloroform extractions. Hazard exposure was greatly reduced following the chloroform extraction protocol when compared with other extraction procedures.
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Affiliation(s)
- Thomas I. Wilkes
- School of Life and Medical Sciences, College Lane Campus, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
- School of Water, Energy, and Environment, Cranfield University, Bedford, Bedfordshire, MK43 0AL, UK
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Feng J, Zhang X, Jiang Y, Ruan Q, Wang Q, Zhang J. Preparation and Bioevaluation of a Novel 99mTc-Labeled Glucose Derivative Containing Cyclohexane as a Promising Tumor Imaging Agent. Pharmaceuticals (Basel) 2023; 16:ph16040612. [PMID: 37111368 PMCID: PMC10144323 DOI: 10.3390/ph16040612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 04/06/2023] [Accepted: 04/14/2023] [Indexed: 04/29/2023] Open
Abstract
To develop novel tumor imaging agents with high tumor uptake and excellent tumor/non-target ratios, a glucose derivative containing cyclohexane (CNMCHDG) was synthesized and labeled with Tc-99m. [99mTc]Tc-CNMCHDG was prepared by a kit formulation that was straightforward to operate and fast. Without purification, [99mTc]Tc-CNMCHDG had a high radiochemical purity of over 95% and great in vitro stability and hydrophilicity (log P = -3.65 ± 0.10). In vitro cellular uptake studies showed that the uptake of [99mTc]Tc-CNMCHDG was significantly inhibited by pre-treatment with D-glucose and increased by pre-treatment with insulin. Preliminary cellular studies have demonstrated that the mechanism by which the complex enters into cells may be related to GLUTs. The results of biodistribution and SPECT imaging studies displayed high tumor uptake and good retention of [99mTc]Tc-CNMCHDG in A549 tumor-bearing mice (4.42 ± 0.36%ID/g at 120 min post-injection). Moreover, [99mTc]Tc-CNMCHDG exhibited excellent tumor-to-non-target ratios and a clean imaging background and is a potential candidate for clinical transformation.
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Affiliation(s)
- Junhong Feng
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Xuran Zhang
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Yuhao Jiang
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Qing Ruan
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Qianna Wang
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Junbo Zhang
- Key Laboratory of Radiopharmaceuticals of Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Radiopharmaceuticals (National Medical Products Administration), College of Chemistry, Beijing Normal University, Beijing 100875, China
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9
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Kartavova KE, Mashkin MY, Kostin MY, Finashina ED, Kalmykov KB, Kapustin GI, Pribytkov PV, Tkachenko OP, Mishin IV, Kustov LM, Kustov AL. Rhodium-Based Catalysts: An Impact of the Support Nature on the Catalytic Cyclohexane Ring Opening. Nanomaterials (Basel) 2023; 13:936. [PMID: 36903814 PMCID: PMC10005695 DOI: 10.3390/nano13050936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/23/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Because of the growing demand for high-quality fuels, the light cycle oil fraction improvement including cetane number improvement is important. The main way to reach this improvement is the ring opening of cyclic hydrocarbons, and a highly effective catalyst should be found. Cyclohexane ring openings are a possible option to investigate the catalyst activity. In this work, we investigated rhodium-loaded catalysts prepared using the commercially available industrial supports: single-component ones, SiO2 and Al2O3; and mixed oxides CaO + MgO + Al2O3 and Na2O + SiO2 + Al2O3. The catalysts were prepared by incipient wetness impregnation and investigated by N2 low-temperature adsorption-desorption, XRD, XPS, DRS UV-Vis and DRIFT spectroscopy, SEM, and TEM with EDX. The catalytic tests were performed in cyclohexane ring opening in the range of 275-325 °C. The best result was demonstrated by the sample 1Rh/CaMgAlO: the selectivity to n-hexane was about 75% while the cyclohexane conversion was about 25% at 275 °C. The space-time yield was up to 12 mmoln-hexane gcat-1h-1.
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Affiliation(s)
- Kristina E. Kartavova
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
| | - Mikhail Yu. Mashkin
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Mikhail Yu. Kostin
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | | | | | | | - Petr V. Pribytkov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Olga P. Tkachenko
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Igor V. Mishin
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Leonid M. Kustov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
| | - Alexander L. Kustov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
- Institute of Ecotechnologies, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry RAS, 119991 Moscow, Russia
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10
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Liu Q, Wen M, Guo Y, Song S, Li G, An T. Efficient Catalytic Combustion of Cyclohexane over PdAg/Fe 2O 3 Catalysts under Low-Temperature Conditions: Establishing the Degradation Mechanism Using PTR-TOF-MS and in Situ DRIFTS. ACS Appl Mater Interfaces 2022; 14:55503-55516. [PMID: 36456474 DOI: 10.1021/acsami.2c14515] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Cyclohexane, a typical volatile organic compound (VOC), poses high risks to the environment and humans. Herein, synthesized PdAg/Fe2O3 catalysts exhibited exceptional catalytic performance for cyclohexane combustion at lower temperatures (50% mineralization temperature (T50) of 199 °C, 90% mineralization temperature (T90) of 315 °C) than Pd/Fe2O3 (T50 of 262 °C, T90 of 335 °C) and Fe2O3 (T50 of 305 °C, T90 of 360 °C). In addition, PdAg/Fe2O3 displayed enhanced stability by alloying Ag with Pd. The redox and acidity of the PdAg/Fe2O3 were studied by XPS, H2-TPR, and NH3-TPD. In situ diffuse reflectance infrared Fourier transform spectroscopy and proton-transfer-reaction time-of-flight mass spectrometry were applied to identify the intermediates formed on the catalyst surface and in the tail gas during oxidation, respectively. Results suggested that loading PdAg onto Fe2O3 significantly enhanced the adsorption and activation of oxygen and cyclohexane, oxidative dehydrogenation of cyclohexane to benzene, and catalytic cracking of cyclohexane to olefins at low temperatures. This in-depth study will benefit the design and application of efficient catalysts for the effective combustion of VOCs at low temperatures.
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Affiliation(s)
- Qiuxia Liu
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Meicheng Wen
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Yunlong Guo
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Shengnan Song
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Guiying Li
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
| | - Taicheng An
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou510006, China
- Guangdong Engineering Technology Research Center for Photocatalytic Technology Integration and Equipment, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou510006, China
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11
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González-Galán C, de Fez-Febré M, Giancola S, González-Cobos J, Vidal-Ferran A, Galán-Mascarós JR, Balestra SRG, Calero S. Separation of Volatile Organic Compounds in TAMOF-1. ACS Appl Mater Interfaces 2022; 14:30772-30785. [PMID: 35793095 PMCID: PMC9679997 DOI: 10.1021/acsami.2c05223] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Separation of volatile organic compounds is one of the most studied processes in industry. TAMOF-1 is a homochiral metal-organic framework with a crystalline network of interconnected ≈1 nm channels and has high thermal and chemical stability. Thanks to these features, it can resolve racemic mixtures of chiral drugs as a chiral stationary phase in chromatography. Interestingly, the particular shape and size of its channels, along with the presence of metallic centers and functional groups, allow establishing weak but significant interactions with guest molecules. This opens interesting possibilities not only to resolve racemates but also to separate other organic mixtures, such as saturated/unsaturated and/or linear/branched molecules. In search of these applications, we have studied the separation of volatile organic compounds in TAMOF-1. Monte Carlo simulations in the grand-canonical ensemble have been carried out to evaluate the separation of the selected molecules. Our results predict that TAMOF-1 is able to separate xylene isomers, hexane isomers, and benzene-cyclohexane mixtures. Experimental breakthrough analysis in the gas phase and also in the liquid phase confirms these predictions. Beds of TAMOF-1 are able to recognize the substitution in xylenes and the branching in hexanes, yielding excellent separation and reproducibility, thanks to the chemical and mechanical features of this material.
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Affiliation(s)
- Carmen González-Galán
- Department
of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera Km 1, ES-41013 Seville, Spain
| | - Mabel de Fez-Febré
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
- Departament
de Química Física I Inorgànica, Universitat Rovira i Virgili, Marcel. Lí Domingo 1, 43007 Tarragona, Spain
| | - Stefano Giancola
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
| | - Jesús González-Cobos
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
| | - Anton Vidal-Ferran
- Catalan
Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys 23, ES-08010 Barcelona, Spain
- Department
of Inorganic and Organic Chemistry, University
of Barcelona, C. Martí
i Franquès 1-11, 08028 Barcelona, Spain
| | - José Ramón Galán-Mascarós
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, ES-43007 Tarragona, Spain
- Catalan
Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys 23, ES-08010 Barcelona, Spain
| | - Salvador R. G. Balestra
- Department
of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera Km 1, ES-41013 Seville, Spain
- Instituto
de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones
Científicas (ICMM-CSIC), c/ Sor Juana Inés de La Cruz, 3, 28049 Madrid, Spain
| | - Sofía Calero
- Department
of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera Km 1, ES-41013 Seville, Spain
- Materials
Simulation and Modelling, Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
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12
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MacDonald M, Thoma E, George I, Duvall R. Demonstration of VOC Fenceline Sensors and Canister Grab Sampling near Chemical Facilities in Louisville, Kentucky. Sensors (Basel) 2022; 22:3480. [PMID: 35591173 DOI: 10.3390/s22093480] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/27/2022] [Accepted: 04/28/2022] [Indexed: 02/04/2023]
Abstract
Experimental fenceline sensor pods (SPods) fitted with 30 s duration canister grab sampling (CGS) systems were deployed at a site near chemical facilities in Louisville, KY, from 4 June 2018 to 5 January 2020. The objective of the study was to better understand lower cost 10.6 eV photoionization detector (PID)-based volatile organic compound (VOC) sensors and investigate their utility for near-source emissions detection applications. Prototype SPods containing PID sensor elements from two different manufacturers yielded between 78% and 86% valid data over the study, producing a dataset of over 120,000 collocated pair fenceline measurements averaged into 5-min datapoints. Ten-second time-resolved SPod data from an elevated fenceline sensor signal day are presented, illustrating source emission detections from the direction of a facility 500 m west of the monitoring site. An SPod-triggered CGS acquired in the emission plume on this day contained elevated concentrations of 1,3-butadiene and cyclohexane (36 parts per billion by volume (ppbv) and 637 ppbv, respectively), compounds known to be emitted by this facility. Elevated concentrations of these compounds were observed in a subset of the 61 manual and triggered CGS grab samples acquired during the study, with winds from the west. Using novel wind-resolved visualization and normalization approaches described herein, the collocated pair SPod datasets exhibited similarity in emission source signature. With winds from the west, approximately 50% of SPod readings were above our defined theoretical detection limit indicating persistent measurable VOC signal at this site. Overall, this 19-month study demonstrated reasonable prototype SPod operational performance indicating that improved commercial forms of lower cost PID sensors could be useful for select VOC fenceline monitoring applications.
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13
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Kang S, Noh C, Kang H, Shin JY, Kim SY, Kim S, Son MG, Park E, Song HK, Shin S, Lee S, Kim NK, Jung Y, Lee Y. Dynamics and Entropy of Cyclohexane Rings Control pH-Responsive Reactivity. JACS Au 2021; 1:2070-2079. [PMID: 34841418 PMCID: PMC8611792 DOI: 10.1021/jacsau.1c00354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Indexed: 05/31/2023]
Abstract
Activation entropy (ΔS ‡) is not normally considered the main factor in determining the reactivity of unimolecular reactions. Here, we report that the intramolecular degradation of six-membered ring compounds is mainly determined by the ΔS ‡, which is strongly influenced by the ring-flipping motion and substituent geometry. Starting from the unique difference between the pH-dependent degradation kinetics of geometric isomers of 1,2-cyclohexanecarboxylic acid amide (1,2-CHCAA), where only the cis isomer can readily degrade under weakly acidic conditions (pH < 5.5), we found that the difference originated from the large difference in ΔS ‡ of 16.02 cal·mol-1·K-1. While cis-1,2-CHCAA maintains a preference for the classical chair cyclohexane conformation, trans-1,2-CHCAA shows dynamic interconversion between the chair and twisted boat conformations, which was supported by both MD simulations and VT-NMR analysis. Steric repulsion between the bulky 1,2-substituents of the trans isomer is one of the main reasons for the reduced energy barrier between ring conformations that facilitates dynamic ring inversion motions. Consequently, the more dynamic trans isomer exhibits much a larger loss in entropy during the activation process due to the prepositioning of the reactant than the cis isomer, and the pH-dependent degradation of the trans isomer is effectively suppressed. When the ring inversion motion is inhibited by an additional methyl substituent on the cyclohexane ring, the pH degradability can be dramatically enhanced for even the trans isomer. This study shows a unique example in which spatial arrangement and dynamic properties can strongly influence molecular reactivity in unimolecular reactions, and it will be helpful for the future design of a reactive structure depending on dynamic conformational changes.
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Affiliation(s)
- Sunyoung Kang
- Department
of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Chanwoo Noh
- Department
of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyosik Kang
- Department
of Chemistry, Gachon University, Seongnam, Gyunggido 13120, Republic of Korea
| | - Ji-Yeon Shin
- Advanced
Analysis Center, Korea Institute of Science
and Technology, Seoul 02792, Republic of Korea
- Department
of Life Sciences, Korea University, Seoul 02841, Republic of Korea
| | - So-Young Kim
- Advanced
Analysis Center, Korea Institute of Science
and Technology, Seoul 02792, Republic of Korea
| | - Seulah Kim
- Department
of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Moon-Gi Son
- Department
of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Eunseok Park
- Bruker
Biospin Korea, Seongnam, Gyunggido 13493, Republic of Korea
| | - Hyun Kyu Song
- Department
of Life Sciences, Korea University, Seoul 02841, Republic of Korea
| | - Seokmin Shin
- Department
of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Sanghun Lee
- Department
of Chemistry, Gachon University, Seongnam, Gyunggido 13120, Republic of Korea
| | - Nak-Kyoon Kim
- Advanced
Analysis Center, Korea Institute of Science
and Technology, Seoul 02792, Republic of Korea
| | - YounJoon Jung
- Department
of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Yan Lee
- Department
of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
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14
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Ding D, Feng E, Kotha RR, Chapman NC, Jiang H, Nash JJ, Kenttämaa HI. Spin-Spin Coupling Controls the Gas-Phase Reactivity of Aromatic σ-Type Triradicals. Chemistry 2021; 28:e202102968. [PMID: 34786768 DOI: 10.1002/chem.202102968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Indexed: 11/11/2022]
Abstract
Examination of the reactions of σ-type quinolinium-based triradicals with cyclohexane in the gas phase demonstrated that the radical site that is the least strongly coupled to the other two radical sites reacts first, independent of the intrinsic reactivity of this radical site, in contrast to related biradicals that first react at the most electron-deficient radical site. Abstraction of one or two H atoms and formation of an ion that formally corresponds to a combination of the ion and cyclohexane accompanied by elimination of a H atom ("addition-H") were observed. In all cases except one, the most reactive radical site of the triradicals is intrinsically less reactive than the other two radical sites. The product complex of the first H atom abstraction either dissociates to give the H-atom-abstraction product and the cyclohexyl radical or the more reactive radical site in the produced biradical abstracts a H atom from the cyclohexyl radical. The monoradical product sometimes adds to cyclohexene followed by elimination of a H atom, generating the "addition-H" products. Similar reaction efficiencies were measured for three of the triradicals as for relevant monoradicals. Surprisingly, the remaining three triradicals (all containing a meta-pyridyne moiety) reacted substantially faster than the relevant monoradicals. This is likely due to the exothermic generation of a meta-pyridyne analog that has enough energy to attain the dehydrocarbon atom separation common for H-atom-abstraction transition states of protonated meta-pyridynes.
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Affiliation(s)
- Duanchen Ding
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - Erlu Feng
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - Raghavendhar R Kotha
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - Nathan C Chapman
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - Hanning Jiang
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - John J Nash
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - Hilkka I Kenttämaa
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
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15
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Macreadie LK, Qazvini OT, Babarao R. Reversing Benzene/ Cyclohexane Selectivity through Varying Supramolecular Interactions Using Aliphatic, Isoreticular MOFs. ACS Appl Mater Interfaces 2021; 13:30885-30890. [PMID: 34165976 DOI: 10.1021/acsami.1c08823] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Effective solid-state adsorbent materials, such as metal organic frameworks (MOFs), rely upon tailored void spaces for selective adsorption of one component from a mixture. This is particularly crucial when separating challenging mixtures such as benzene (Bz) and cyclohexane (Cy) requiring a highly expensive and energy intensive process. Employing bulky "3D-linkers" to construct MOFs leads to materials with unique, contoured pore shapes which consequently allow for significant control over guest adsorption preferences. Investigation into these selectivity preferences is key to identifying suitable materials for industrial separations and is an area currently underexplored. Here, we provide an in-depth investigation exploring the selectivity path between planar and 3D-linkers and their preference to adsorb either Cy or Bz. To validate this principle, the adsorption selectivity of Cy and Bz in 3DL-MOF-1 ([Zn4O(pdc)3] (pdc = bicylo[1.1.1]pentane-1,3-dicarboxylate), CUB-5, and MOF-5 was explored. MOF-5 exhibits a selective preference for Cy adsorption at low pressures, contrary to popular belief, while CUB-5 and 3DL-MOF-1 are Bz selective. DFT-D3 calculations and breakthrough simulations explore this behavior and highlight CUB-5 and MOF-5 as strong candidates for future separation materials.
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Affiliation(s)
- Lauren K Macreadie
- School of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
- School of Fundamental Sciences, Massey University, Palmerston North 4442, New Zealand
| | - Omid T Qazvini
- Department of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, U.K
| | - Ravichandar Babarao
- School of Science, RMIT University, Melbourne 3001, Victoria, Australia
- CSIRO, Normanby Road, Clayton 3168, Victoria, Australia
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16
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Dembitsky VM, Gloriozova TA, Poroikov VV. Antitumor Profile of Carbon-Bridged Steroids (CBS) and Triterpenoids. Mar Drugs 2021; 19:324. [PMID: 34205074 PMCID: PMC8228860 DOI: 10.3390/md19060324] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/01/2021] [Accepted: 06/01/2021] [Indexed: 12/12/2022] Open
Abstract
This review focuses on the rare group of carbon-bridged steroids (CBS) and triterpenoids found in various natural sources such as green, yellow-green, and red algae, marine sponges, soft corals, ascidians, starfish, and other marine invertebrates. In addition, this group of rare lipids is found in amoebas, fungi, fungal endophytes, and plants. For convenience, the presented CBS and triterpenoids are divided into four groups, which include: (a) CBS and triterpenoids containing a cyclopropane group; (b) CBS and triterpenoids with cyclopropane ring in the side chain; (c) CBS and triterpenoids containing a cyclobutane group; (d) CBS and triterpenoids containing cyclopentane, cyclohexane or cycloheptane moieties. For the comparative characterization of the antitumor profile, we have added several semi- and synthetic CBS and triterpenoids, with various additional rings, to identify possible promising sources for pharmacologists and the pharmaceutical industry. About 300 CBS and triterpenoids are presented in this review, which demonstrate a wide range of biological activities, but the most pronounced antitumor profile. The review summarizes biological activities both determined experimentally and estimated using the well-known PASS software. According to the data obtained, two-thirds of CBS and triterpenoids show moderate activity levels with a confidence level of 70 to 90%; however, one third of these lipids demonstrate strong antitumor activity with a confidence level exceeding 90%. Several CBS and triterpenoids, from different lipid groups, demonstrate selective action on different types of tumor cells such as renal cancer, sarcoma, pancreatic cancer, prostate cancer, lymphocytic leukemia, myeloid leukemia, liver cancer, and genitourinary cancer with varying degrees of confidence. In addition, the review presents graphical images of the antitumor profile of both individual CBS and triterpenoids groups and individual compounds.
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Affiliation(s)
- Valery M. Dembitsky
- Centre for Applied Research, Innovation and Entrepreneurship, Lethbridge College, 3000 College Drive South, Lethbridge, AB T1K 1L6, Canada
| | - Tatyana A. Gloriozova
- Institute of Biomedical Chemistry, Bldg. 8, 10 Pogodinskaya Str., 119121 Moscow, Russia; (T.A.G.); (V.V.P.)
| | - Vladimir V. Poroikov
- Institute of Biomedical Chemistry, Bldg. 8, 10 Pogodinskaya Str., 119121 Moscow, Russia; (T.A.G.); (V.V.P.)
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17
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Hernández-Monje D, Giraldo L, Moreno-Piraján JC. Enthalpic and Liquid-Phase Adsorption Study of Toluene- Cyclohexane and Toluene-Hexane Binary Systems on Modified Activated Carbons. Molecules 2021; 26:molecules26102839. [PMID: 34064753 PMCID: PMC8151323 DOI: 10.3390/molecules26102839] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/01/2021] [Accepted: 05/04/2021] [Indexed: 12/03/2022] Open
Abstract
The liquid-phase adsorption of toluene in cyclohexane and hexane solutions on modified activated carbons was evaluated; the energy involved in the interaction between these solutions and the solids was determined by immersion enthalpies of pure solvents and their mixtures, and the contribution of the system constituents was calculated by differential enthalpies. The thermal treatment generated modifications that favored adsorption and interaction with the evaluated solutions, since it increased the textural parameters and the basic character of the samples. Cyclohexane could create greater competition with the adsorption sites compared to hexane, but it favored the increase in adsorption capacities (0.416 to 1.026 mmol g−1) and the interactions with the solid evaluated through the immersion enthalpies. The immersion enthalpies of pure solvents (−16.36 to −112.7 J g−1) and mixtures (−25.65 to −104.34 J g−1) had exothermic behaviors that were decreasing due to the possible displacement of solvent molecules when increasing the solute concentration in the mixtures. The differential enthalpies for toluene were negative (−18.63 to −2.14 J), mainly due to the π–π interaction with the solid, while those of the solvent–solid component tended to be positive values (−4.25 to 55.97 J) due to the displacement of the solvent molecules by those of toluene.
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Affiliation(s)
- Diana Hernández-Monje
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Bogotá, Carrera 30 No 45-03, Bogotá 11001, Colombia; (D.H.-M.); (L.G.)
| | - Liliana Giraldo
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Bogotá, Carrera 30 No 45-03, Bogotá 11001, Colombia; (D.H.-M.); (L.G.)
| | - Juan Carlos Moreno-Piraján
- Departamento de Química, Facultad de Ciencias, Universidad de los Andes, Carrera 1 este No 18A-10, Bogotá 111711, Colombia
- Correspondence: ; Tel.: +571-339-4949 (ext. 3465-3478-4753)
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Jankovská Z, Večeř M, Koutník I, Matějová L. A Case Study of Waste Scrap Tyre-Derived Carbon Black Tested for Nitrogen, Carbon Dioxide, and Cyclohexane Adsorption. Molecules 2020; 25:molecules25194445. [PMID: 32992654 PMCID: PMC7582628 DOI: 10.3390/molecules25194445] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/22/2020] [Accepted: 09/25/2020] [Indexed: 11/16/2022] Open
Abstract
Waste scrap tyres were thermally decomposed at the temperature of 600 °C and heating rate of 10 °C·min-1. Decomposition was followed by the TG analysis. The resulting pyrolytic carbon black was chemically activated by a KOH solution at 800 °C. Activated and non-activated carbon black were investigated using high pressure thermogravimetry, where adsorption isotherms of N2, CO2, and cyclohexane were determined. Isotherms were determined over a wide range of pressure, 0.03-4.5 MPa for N2 and 0.03-2 MPa for CO2. In non-activated carbon black, for the same pressure and temperature, a five times greater gas uptake of CO2 than N2 was determined. Contrary to non-activated carbon black, activated carbon black showed improved textural properties with a well-developed irregular mesoporous-macroporous structure with a significant amount of micropores. The sorption capacity of pyrolytic carbon black was also increased by activation. The uptake of CO2 was three times and for cyclohexane ten times higher in activated carbon black than in the non-activated one. Specific surface areas evaluated from linearized forms of Langmuir isotherm and the BET isotherm revealed that for both methods, the values are comparable for non-activated carbon black measured by CO2 and for activated carbon black measured by cyclohexane. It was found out that the N2 sorption capacity of carbon black depends only on its specific surface area size, contrary to CO2 sorption capacity, which is affected by both the size of specific surface area and the nature of carbon black.
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Affiliation(s)
- Zuzana Jankovská
- Faculty of Materials Science and Technology, Department of Chemistry, VŠB—Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech Republic; (M.V.); (I.K.)
- Institute of Environmental Technology, VŠB—Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech Republic;
- Correspondence: ; Tel.:+420-597-324-723
| | - Marek Večeř
- Faculty of Materials Science and Technology, Department of Chemistry, VŠB—Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech Republic; (M.V.); (I.K.)
| | - Ivan Koutník
- Faculty of Materials Science and Technology, Department of Chemistry, VŠB—Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech Republic; (M.V.); (I.K.)
- Institute of Environmental Technology, VŠB—Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech Republic;
| | - Lenka Matějová
- Institute of Environmental Technology, VŠB—Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech Republic;
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Song MY, He QR, Wang YL, Wang HR, Jiang TC, Tang JJ, Gao JM. Exploring Diverse-Ring Analogues on Combretastatin A4 (CA-4) Olefin as Microtubule-Targeting Agents. Int J Mol Sci 2020; 21:E1817. [PMID: 32155790 DOI: 10.3390/ijms21051817] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 03/02/2020] [Accepted: 03/04/2020] [Indexed: 12/17/2022] Open
Abstract
Combretastatin-4 (CA-4) as a tubulin polymerization inhibitor draws extensive attentions. However, due to its weak stability of cis-olefin and poor metabolic stability, structure modifications on cis-configuration are being performed. In this work, we constructed a series of novel CA-4 analogues with linkers on olefin containing diphenylethanone, cis-locked dihydrofuran, α-substituted diphenylethanone, cyclobutane and cyclohexane on its cis-olefin. Cytotoxic activity of all analogues was measured by an SRB assay. Among them, compound 6b, a by-product in the preparation of diphenylethanone analogues, was found to be the most potent cytotoxic agents against HepG2 cells with IC50 values of less than 0.5 μM. The two isomers of 6b induced cellular apoptosis tested by Annexin V-FITC and propidium iodide (PI) double staining, arrested cells in the G2/M phase by PI staining analysis, and disrupted microtubule network by immunohistochemistry study in HepG2 cells. Moreover, 6b-(E) displayed a dose-dependent inhibition effect for tubulin assembly in in vitro tubulin polymerization assay. In addition, molecular docking studies showed that two isomers of 6b could bind efficiently at colchicine binding site of tubulin similar to CA-4.
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20
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Henríquez A, Melin V, Moreno N, Mansilla HD, Contreras D. Optimization of Cyclohexanol and Cyclohexanone Yield in the Photocatalytic Oxofunctionalization of Cyclohexane over Degussa P-25 under Visible Light. Molecules 2019; 24:E2244. [PMID: 31208090 DOI: 10.3390/molecules24122244] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/11/2019] [Accepted: 06/13/2019] [Indexed: 11/16/2022] Open
Abstract
The sustainable transformation of basic chemicals into organic compounds of industrial interest using mild oxidation processes has proved to be challenging. The production of cyclohexanol and cyclohexanone from cyclohexane is of interest to the nylon manufacturing industry. However, the industrial oxidation of cyclohexane is inefficient. Heterogeneous photocatalysis represents an alternative way to synthesize these products, but the optimization of this process is difficult. In this work, the yields of photocatalytic cyclohexane conversion using Degussa P-25 under visible light were optimized. To improve cyclohexanol production, acetonitrile was used as an inert photocatalytic solvent. Experiments showed that the use of the optimized conditions under solar light radiation did not affect the cyclohexanol/cyclohexanone ratio. In addition, the main radical intermediary produced in the reaction was detected by the electronic paramagnetic resonance technique.
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21
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Sutradhar M, Barman TR, Pombeiro AJL, Martins LMDRS. Catalytic Activity of Polynuclear vs. Dinuclear Aroylhydrazone Cu(II) Complexes in Microwave-Assisted Oxidation of Neat Aliphatic and Aromatic Hydrocarbons. Molecules 2018; 24:molecules24010047. [PMID: 30583583 PMCID: PMC6337553 DOI: 10.3390/molecules24010047] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 12/16/2018] [Accepted: 12/21/2018] [Indexed: 11/16/2022] Open
Abstract
One-dimensional (1D) polynuclear Cu(II) complex (1) derived from (5-bromo-2-hydroxybenzylidene)-2-hydroxybenzohydrazide (H₂L) is synthesized and characterized by elemental analysis, IR spectroscopy, ESI-MS, and single crystal X-ray crystallography. Its catalytic performance towards the solvent-free microwave-assisted peroxidative oxidation of aliphatic and aromatic hydrocarbons under mild conditions is compared with that of dinuclear Cu(II) complexes (2 and 3) of the same ligand, previously reported as antiproliferative agents. Polymer 1 exhibits the highest activity, either for the oxidation of cyclohexane (leading to overall yields, based on the alkane, of up to 39% of cyclohexanol and cyclohexanone) or towards the oxidation of toluene (selectively affording benzaldehyde up to a 44% yield), after 2 or 2.5 h of irradiation at 80 or 50 °C, respectively.
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Affiliation(s)
- Manas Sutradhar
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Tannistha Roy Barman
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Armando J L Pombeiro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Luísa M D R S Martins
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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22
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Zhao N, Li Y, Gu J, Fernandes TA, Kirillova MV, Kirillov AM. New Copper(II) Coordination Compounds Assembled from Multifunctional Pyridine-Carboxylate Blocks: Synthesis, Structures, and Catalytic Activity in Cycloalkane Oxidation. Molecules 2018; 24:molecules24010006. [PMID: 30577477 PMCID: PMC6337171 DOI: 10.3390/molecules24010006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Revised: 12/15/2018] [Accepted: 12/18/2018] [Indexed: 11/16/2022] Open
Abstract
Two new copper(II) coordination compounds, namely a 1D coordination polymer [Cu(µ-cpna)(phen)(H2O)]n (1) and a discrete tetracopper(II) derivative [Cu(phen)2(H2O)]2[Cu2(µ-Hdppa)2(Hdppa)2] (2), were hydrothermally synthesized from copper(II) chloride as a metal source, 5-(4-carboxyphenoxy)nicotinic acid (H2cpna) or 5-(3,4-dicarboxylphenyl)picolinic acid (H3dppa) as a principal building block, and 1,10-phenanthroline (phen) as a crystallization mediator. Compounds 1 and 2 were isolated as air-stable microcrystalline solids and fully characterized by elemental and thermogravimetric analyses, IR spectroscopy, powder and single-crystal X-ray diffraction. In the solid state, the structure of 1 discloses the linear interdigitated 1D coordination polymer chains with the 2C1 topology. The crystal structure of an ionic derivative 2 shows that the mono- and dicopper(II) units are extended into the intricate 1D hydrogen-bonded chains with the SP 1-periodic net (4,4)(0,2) topology. Thermal stability and catalytic properties of 1 and 2 were also investigated. In fact, both Cu derivatives act as efficient homogeneous catalysts (catalyst precursors) for the mild oxidation of cycloalkanes by hydrogen peroxide to give the corresponding alcohols and ketones; the substrate scope and the effects of type and amount of acid promoter as well as bond-, regio-, and stereo-selectivity features were investigated.
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Affiliation(s)
- Na Zhao
- Foshan Research Center for Special Functional Building Materials and Their Green Preparation Technology, Guangdong Industry Polytechnic, Guangzhou 510300, China.
| | - Yu Li
- Foshan Research Center for Special Functional Building Materials and Their Green Preparation Technology, Guangdong Industry Polytechnic, Guangzhou 510300, China.
| | - Jinzhong Gu
- College of chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
| | - Tiago A Fernandes
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
| | - Marina V Kirillova
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
| | - Alexander M Kirillov
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
- Peoples' Friendship University of Russia (RUDN University), Research Institute of Chemistry, 6 Miklukho-Maklaya st., Moscow 117198, Russia.
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23
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Sławek A, Grzybowska K, Vicent-Luna JM, Makowski W, Calero S. Adsorption of Cyclohexane in Pure Silica Zeolites: High-Throughput Computational Screening Validated by Experimental Data. Chemphyschem 2018; 19:3364-3371. [PMID: 30457696 DOI: 10.1002/cphc.201800968] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Indexed: 11/09/2022]
Abstract
Adsorption of cyclohexane in pure silica zeolites was studied experimentally and by molecular simulations. Based on the adsorption isobars obtained from the quasi-equilibrated temperature adsorption and desorption (QE-TPDA) measurements and reported adsorption isotherms for high-silica zeolites Y, ZSM-5, and ZSM-11 we refined Lennard-Jones parameters for guest-host interactions available in the literature. Adsorption of cyclohexane from equimolar mixture of twisted-boat and chair conformations has been screened in 171 pure silica zeolitic structures using grand canonical Monte Carlo simulations. Almost 20 frameworks showing extraordinary preference for adsorption of the chair conformation over the twisted boat one or vice versa were found. This selectivity was attributed to the geometry of channels and cavities present in the pore structures, as all t-boat selective structures possess channels or cavities of 8.3-9.1 Å. We also differentiated ways of chair-selectivity depending on the size and shape of the channels or cavities and also on the arrangement of the guest molecules in the pores.
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Affiliation(s)
- Andrzej Sławek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Karolina Grzybowska
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - José Manuel Vicent-Luna
- Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera km 1. ES-41013, Seville, Spain
| | - Wacław Makowski
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Sofía Calero
- Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera km 1. ES-41013, Seville, Spain
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24
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Mo L, Yu W, Cai H, Lou H, Zheng X. Hydrodeoxygenation of Bio-Derived Phenol to Cyclohexane Fuel Catalyzed by Bifunctional Mesoporous Organic-Inorganic Hybrids. Front Chem 2018; 6:216. [PMID: 29963548 PMCID: PMC6010534 DOI: 10.3389/fchem.2018.00216] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 05/25/2018] [Indexed: 11/13/2022] Open
Abstract
In this work, mesoporous silica materials SBA-15 functionalized with propyl/ phenyl-sulfonic acid group were synthesized and loaded with Pt to form bifunctional catalysts. SAXRD, WAXRD, N2 adsorption-desorption, TEM techniques were used to characterize the above bifunctional catalysts. These bifunctional catalysts were applied to the reaction of hydrodeoxygenation (HDO) of bio-derived phenol (PhOH) to produce cyclohexane fuel and showed very good catalytic performances. There were strong synergies between the metal sites and the acid sites on the bifunctional catalysts. This reaction of phenol HDO provides a model system for the catalytic upgrading of biomass-derived fuel.
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Affiliation(s)
- Liuye Mo
- Institute of Innovation & Application, Zhejiang Ocean University, Zhoushan, China
| | - Wanjin Yu
- State Key Laboratory of Fluorinated Greenhouse Gases Replacement and Control Treatment, Zhejiang Research Institute of Chemical Industry, Hangzhou, China
| | - Huangju Cai
- Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, China
| | - Hui Lou
- Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, China
| | - Xiaoming Zheng
- Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, China
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25
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Ribeiro AP, Martins LM, Carabineiro SA, Figueiredo JL, Pombeiro AJ. Gold Nanoparticles Deposited on Surface Modified Carbon Xerogels as Reusable Catalysts for Cyclohexane C-H Activation in the Presence of CO and Water. Molecules 2017; 22:E603. [PMID: 28397772 DOI: 10.3390/molecules22040603] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 03/31/2017] [Accepted: 04/03/2017] [Indexed: 11/21/2022] Open
Abstract
The use of gold as a promotor of alkane hydrocarboxylation is reported for the first time. Cyclohexane hydrocarboxylation to cyclohexanecarboxylic acid (up to 55% yield) with CO, water, and peroxodisulfate in a water/acetonitrile medium at circa 50 °C has been achieved in the presence of gold nanoparticles deposited by a colloidal method on a carbon xerogel in its original form (CX), after oxidation with HNO3 (-ox), or after oxidation with HNO3 and subsequent treatment with NaOH (-ox-Na). Au/CX-ox-Na behaves as re-usable catalyst maintaining its initial activity and selectivity for at least seven consecutive cycles. Green metric values of atom economy or carbon efficiency also attest to the improvement brought by this novel catalytic system to the hydrocarboxylation of cyclohexane.
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26
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Koutian A, Assael MJ, Huber ML, Perkins RA. Reference Correlation of the Thermal Conductivity of Cyclohexane from the Triple Point to 640 K and up to 175 MPa. J Phys Chem Ref Data 2017; 46:013102. [PMID: 28584386 PMCID: PMC5455799 DOI: 10.1063/1.4974325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
New, wide-range reference equations for the thermal conductivity of cyclohexane as a function of temperature and density are presented. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory whenever possible. We estimate the uncertainty (at the 95% confidence level) for the thermal conductivity of cyclohexane from the triple point (279.86 K) to 650 K at pressures up to 175 MPa to be 4% for the compressed liquid and supercritical phases. For the low-pressure gas phase (up to 0.1 MPa) over the temperature range 280 K to 680 K, the estimated uncertainty is 2.5%. Uncertainties in the critical region are much larger, since the thermal conductivity approaches infinity at the critical point and is very sensitive to small changes in density.
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Affiliation(s)
- A. Koutian
- Laboratory of Thermophysical Properties and Environmental Processes,
Chemical Engineering Department, Aristotle University, Thessaloniki 54636,
Greece
| | - M. J. Assael
- Laboratory of Thermophysical Properties and Environmental Processes,
Chemical Engineering Department, Aristotle University, Thessaloniki 54636,
Greece
| | - M. L. Huber
- Applied Chemicals and Materials Division, National Institute of
Standards and Technology, 325 Broadway, Boulder, CO 80305, USA
| | - R. A. Perkins
- Applied Chemicals and Materials Division, National Institute of
Standards and Technology, 325 Broadway, Boulder, CO 80305, USA
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27
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Wang L, Zhao S, Liu C, Li C, Li X, Li H, Wang Y, Ma C, Li Z, Zeng J. Aerobic Oxidation of Cyclohexane on Catalysts Based on Twinned and Single-Crystal Au75Pd25 Bimetallic Nanocrystals. Nano Lett 2015; 15:2875-2880. [PMID: 25839191 DOI: 10.1021/nl5045132] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Bimetallic Au75Pd25 nanocrystals with shapes of icosahedron and octahedron were synthesized by adding different amounts of iodide ions, and were employed as catalysts for solvent-free aerobic oxidation of cyclohexane. Although both icosahedrons and octahedrons were bounded by {111} facets, the turnover frequency number of Au75Pd25 icosahedrons reached 15,106 h(-1), almost three times as high as that of Au75Pd25 octahedrons. The conversion of cyclohexane reached 28.1% after 48 h using Au75Pd25 icosahedrons, with the selectivity of 84.3% to cyclohexanone. Density functional theory calculations along with X-ray photoelectron spectroscopy examinations reveal that the excellent catalytic performance of AuPd icosahedrons could be ascribed to twin-induced strain and highly negative charge density of Au atoms on the surface.
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Affiliation(s)
- Liangbing Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Songtao Zhao
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Chenxuan Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Chen Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Xu Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Hongliang Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Youcheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Chao Ma
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Zhenyu Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Jie Zeng
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Center of Advanced Nanocatalysis (CAN-USTC), CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
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28
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Jaekel U, Zedelius J, Wilkes H, Musat F. Anaerobic degradation of cyclohexane by sulfate-reducing bacteria from hydrocarbon-contaminated marine sediments. Front Microbiol 2015; 6:116. [PMID: 25806023 PMCID: PMC4352924 DOI: 10.3389/fmicb.2015.00116] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 01/29/2015] [Indexed: 11/13/2022] Open
Abstract
The fate of cyclohexane, often used as a model compound for the biodegradation of cyclic alkanes due to its abundance in crude oils, in anoxic marine sediments has been poorly investigated. In the present study, we obtained an enrichment culture of cyclohexane-degrading sulfate-reducing bacteria from hydrocarbon-contaminated intertidal marine sediments. Microscopic analyses showed an apparent dominance by oval cells of 1.5 × 0.8 μm. Analysis of a 16S rRNA gene library, followed by whole-cell hybridization with group- and sequence-specific oligonucleotide probes showed that these cells belonged to a single phylotype, and were accounting for more than 80% of the total cell number. The dominant phylotype, affiliated with the Desulfosarcina-Desulfococcus cluster of the Deltaproteobacteria, is proposed to be responsible for the degradation of cyclohexane. Quantitative growth experiments showed that cyclohexane degradation was coupled with the stoichiometric reduction of sulfate to sulfide. Substrate response tests corroborated with hybridization with a sequence-specific oligonucleotide probe suggested that the dominant phylotype apparently was able to degrade other cyclic and n-alkanes, including the gaseous alkane n-butane. Based on GC-MS analyses of culture extracts cyclohexylsuccinate was identified as a metabolite, indicating an activation of cyclohexane by addition to fumarate. Other metabolites detected were 3-cyclohexylpropionate and cyclohexanecarboxylate providing evidence that the overall degradation pathway of cyclohexane under anoxic conditions is analogous to that of n-alkanes.
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Affiliation(s)
- Ulrike Jaekel
- Department of Microbiology, Max Planck Institute for Marine Microbiology Bremen, Germany
| | - Johannes Zedelius
- Department of Microbiology, Max Planck Institute for Marine Microbiology Bremen, Germany
| | - Heinz Wilkes
- Organic Geochemistry, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences Potsdam, Germany
| | - Florin Musat
- Department of Microbiology, Max Planck Institute for Marine Microbiology Bremen, Germany ; Isotope Biogeochemistry, Helmholtz Centre for Environmental Research - UFZ Leipzig, Germany
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29
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Jóźwik P, Salerno M, Stępniowski WJ, Bojar Z, Krawczyk K. Decomposition of Cyclohexane on Ni₃Al Thin Foil Intermetallic Catalyst. Materials (Basel) 2014; 7:7039-7047. [PMID: 28788230 PMCID: PMC5456010 DOI: 10.3390/ma7107039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 10/09/2014] [Accepted: 10/10/2014] [Indexed: 11/30/2022]
Abstract
Micro-grained thin foils made of Ni3Al intermetallic alloy were fabricated, according to a previously described procedure, and tested as catalyst for decomposition of cyclohexane. The conversion efficiency of the catalyst was evaluated in a synthetic air atmosphere, and found to be as high as 98.7% ± 1.0% at 600 °C and 86.7% ± 3.6% at 500 °C. During the reaction, the growth of carbon nanofibers on the catalysts surface was observed. The chemical and phase composition of the nanofibers was investigated with scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), finding them to be made of graphitic carbon. Additionally, nanoparticles of nickel appear to be incorporated in the fibers. The obtained material is promising for large scale fabrication in industrial applications because of its high efficiency in the hydrocarbon decomposition, the simple fabrication procedure, and the form of self-supporting foils with the presence of additional carbon nanofibers that increase its efficiency.
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Affiliation(s)
- Paweł Jóźwik
- Department of Advanced Materials and Technologies, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Kaliskiego 2 Str., 00-908 Warszawa, Poland.
| | - Marco Salerno
- Department of Nanophysics, Istituto Italiano di Tecnologia, via Morego 30, I-16163 Genova, Italy.
| | - Wojciech J Stępniowski
- Department of Advanced Materials and Technologies, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Kaliskiego 2 Str., 00-908 Warszawa, Poland.
| | - Zbigniew Bojar
- Department of Advanced Materials and Technologies, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Kaliskiego 2 Str., 00-908 Warszawa, Poland.
| | - Krzysztof Krawczyk
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warszawa, Poland.
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30
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Yao CM, Yang XW. Bioactivity-guided isolation of polyacetylenes with inhibitory activity against NO production in LPS-activated RAW264.7 macrophages from the rhizomes of Atractylodes macrocephala. J Ethnopharmacol 2014; 151:791-799. [PMID: 24296088 DOI: 10.1016/j.jep.2013.10.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 08/25/2013] [Accepted: 10/02/2013] [Indexed: 06/02/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The rhizome of Atractylodes macrocephala (Compositae) is one of the most well-known traditional Chinese medicine in China, Japan and Korea, which has a long history of use for the treatment of splenic asthenia, edema, anorexia, and excessive perspiration, etc. As active compounds of anti-inflammatory activity of this medicinal plant have not been fully elucidated, the aim of this study was to isolate and identify the active constituents inhibiting nitric oxide (NO) production from the rhizomes of A. macrocephala. MATERIALS AND METHODS Inhibitory activity against NO production in lipopolysaccharide-activated RAW264.7 macrophages was evaluated by Griess reaction. Fifteen polyacetylenes were isolated from the active ethyl acetate extract using activity-guided screening. The structures of all compounds were elucidated by spectroscopic methods and comparison with published data. The compounds were further tested for their inhibitory activity against NO production. RESULTS Seven new polyacetylenes, named atractylodemaynes A-G (1-7), along with eight known ones (8-15) were isolated. Compound 14 was isolated for the first time from the rhizomes of A. macrocephala. The study showed that the tested compounds exhibited inhibitory activity against NO production in a dose-dependent manner. Among them, compounds 10, 11 and 12 had relatively stronger inhibitory effect with IC50 values of 28, 23 and 19μM, respectively. CONCLUSION The results demonstrated that the polyacetylenes might greatly contribute to the anti-inflammatory activity of the rhizomes of A. macrocephala.
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Key Words
- (1)H–(1)H COSY
- (1)H–(1)H correlated spectroscopy
- 14-Acetoxy-12-senecioyloxytetradeca-2E,8E,10E-trien-4,6-diyn-1-ol (PubChem CID: 14448076)
- 14-Acetoxy-12-α-methylbutyryltetradeca-2E,8E,10E-trien-4,6-diyne-1-ol (PubChem CID: 5319529)
- 14-Acetoxy-12-α-methylbutyryltetradeca-2E,8Z,10E-trien-4,6-diyne-1-ol (PubChem CID: 5319530)
- 14-Acetoxy-12-β-methylbutyryltetradeca-2E,8E,10E-trien-4,6-diyne-1-ol (PubChem CID: 14586258)
- 14-α-Methylbutyryltetradeca-2E,8E,10E-trien-4,6-diyne-1-ol (PubChem CID: 5319531)
- 14-β-Methylbutyryltetradeca-2E,8E,10E-trien-4,6-diyne-1-ol (PubChem CID: 11544212)
- 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide
- AMR
- AO-I
- AO-III
- Anti-inflammatory
- Atractylodes macrocephala
- Atractylodis Macrocephalae Rhizoma
- BuOH
- CC
- CHX
- Compositae
- EtOAc
- EtOH
- HMBC
- HPLC
- HRESIMS
- HSQC
- IND
- L-N(6)-(1-iminoethyl)-lysine
- L-NIL
- LPS
- MTT
- NMR
- NO
- Nitric oxide
- Polyacetylenes
- atractylenolide I
- atractylenolide III
- column chromatography
- cyclohexane
- ethanol
- ethyl acetate
- heteronuclear multiple bond correlation
- heteronuclear single quantum correlation
- high-performance liquid chromatography
- high-resolution electric spray ion mass spectrum
- indomethacin
- lipopolysaccharides
- n-butanol
- nitric oxide
- nuclear magnetic resonance
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Affiliation(s)
- Chun-Mei Yao
- State Key Laboratory of Natural and Biomimetic Drugs (Peking University), Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center, Peking University, Beijing 100191, China
| | - Xiu-Wei Yang
- State Key Laboratory of Natural and Biomimetic Drugs (Peking University), Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center, Peking University, Beijing 100191, China.
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Huie RE, Herron JT. Rates of Reaction of Atomic Oxygen III. Spiropentane, Cyclopentane, Cyclohexane, and Cycloheptane. J Res Natl Bur Stand A Phys Chem 1972; 76A:77-80. [PMID: 34565842 DOI: 10.6028/jres.076a.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Rate constants have been measured from 307 to 652 K for the reactions of atomic oxygen (O3P) with spiropentane, cyclopentane, cyclohexane, and cycloheptane. The derived Arrhenius parameters are k(sp - C5H8) = 1013.60±0.10 exp[(-2890 ± 100)/T], k(cy - C5H10) = 1014.10±0.09 exp[(-2210 ± 100)/T], k(cy - C6H12) = 1014.35±0.09 exp[(-2350 ± 100)/T], and (cy - C7H14) = 1014.46±0.13 exp[(-2230 ± 100)/T] all in units of cm3 mol-1 s-1.
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Affiliation(s)
- Robert E Huie
- Institute for Materials Research, National Bureau of Standards Washington, D.C. 20234
| | - John T Herron
- Institute for Materials Research, National Bureau of Standards Washington, D.C. 20234
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32
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Abstract
NBS Standard Sample Polystyrene 705 is shown to exhibit a small, but significant, hypochromism in the 38,300 cm-1 region in several solvents compared to the model compound, ethylbenzene. Beer's law is not obeyed for solutions of the polymer in all solvents. The concentration dependence of the extinction coefficient is related to the scattered light and its dependence on the activity coefficient of the solvent. The specific extinction coefficients for polystyrene 705 in cyclohexane and in carbon tetrachloride are 20.89 and 27.38, respectively.
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Affiliation(s)
- V M Story
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - D McIntyre
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
| | - J H O'Mara
- Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234
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