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Sarkar W, LaDuca A, Wilson JR, Szymczak NK. Iron-Catalyzed C-H Oxygenation Using Perchlorate Enabled by Secondary Sphere Hydrogen Bonds. J Am Chem Soc 2024; 146:10508-10516. [PMID: 38564312 PMCID: PMC11137739 DOI: 10.1021/jacs.3c14433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Perchlorate (ClO4-) is a groundwater pollutant that is challenging to remediate. We report a strategy to use Fe(II) tris(2-pyridylmethyl)amine (TPA) complexes featuring appended aniline hydrogen bonds (H-bonds) to promote ClO4- reduction. These complexes facilitate oxygen atom transfer from ClO4- to PPh3 and C-H oxygenation reactions of organic substrates. Catalytic reactions using 15 mol % afforded excellent yields for oxygenation of anthracene and cyclic alkyl aromatics, and this methodology tolerates aryl halides as well as heterocycles containing either O, S, or N.
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Affiliation(s)
- Writhabrata Sarkar
- Department of Chemistry, University of Michigan, 930 N. University, Ann Arbor, Michigan 48109, United States
| | - Andrew LaDuca
- Department of Chemistry, University of Michigan, 930 N. University, Ann Arbor, Michigan 48109, United States
| | - Jessica R Wilson
- Department of Chemistry, University of Michigan, 930 N. University, Ann Arbor, Michigan 48109, United States
| | - Nathaniel K Szymczak
- Department of Chemistry, University of Michigan, 930 N. University, Ann Arbor, Michigan 48109, United States
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2
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Chen Y, Li B, Li K, Lin Y. Superoxide dismutase nanozymes: current status and future perspectives on brain disease treatment and diagnosis. Chem Commun (Camb) 2024; 60:4140-4147. [PMID: 38566603 DOI: 10.1039/d3cc06288k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Superoxide dismutase (SOD) is an important metalloenzyme that catalyzes the dismutation of superoxide radicals (O2˙-) into hydrogen peroxide (H2O2) and oxygen (O2). However, the clinical application of SOD is severely limited due to its structural instability and high cost. Compared with natural enzymes, nanomaterials with enzyme-like activity, nanoenzymes, are more stable, economical and easy to modify and their activity can be adjusted. Certain nanozymes that exhibit SOD-like activity have been created and shown to help prevent illnesses brought about by oxidative stress. These SOD-like nanozymes offer an important solution to the problems associated with the clinical application of SOD. In this review, we briefly introduce neurodegenerative diseases, present the research progress of SOD-like nanoenzymes in the diagnosis and treatment of brain diseases, review their mechanism of action in the treatment and diagnosis of brain diseases, and discuss the shortcomings of the current research with a view to providing a reference for future research. We expect more highly active SOD-like nanoenzymes to be developed with a wide range of applications in the diagnosis and treatment of brain diseases.
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Affiliation(s)
- Ying Chen
- Department of Chemistry, Capital Normal University, Beijing, 100048, China.
| | - Bo Li
- Department of Chemistry, Henan Open University, Henan, 450046, China
| | - Kai Li
- Department of Chemistry, Capital Normal University, Beijing, 100048, China.
| | - Yuqing Lin
- Department of Chemistry, Capital Normal University, Beijing, 100048, China.
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3
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Singh O, Singh A, Maji A, Chauhan R, Gupta P, Ghosh K. Crystal structure of a phenoxyl radical complex relevant to the metal site of the galactose oxidase enzyme: A facile one-pot synthesis, evidence for hydrogen atom transfer and DNA cleavage via self-activation. Dalton Trans 2024; 53:986-995. [PMID: 38088032 DOI: 10.1039/d3dt03282e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
Copper complexes [Cu(L1H)ClO4] (1) and [Cu(L2)NO3] (2), which are relevant to the metal site of the galactose oxidase enzyme, were synthesized and characterized by different spectroscopic methods. L1H2 and L2H2 [where L1H2 stands for 2,2'-((1E,1'E)(2,2'-(pyridine-2,6-diyl)bis(2-phenylhydrazin-2-yl-1-ylidene))bis(methanylylidene))diphenol and L2H2 stands for 6,6'-((1E,1'E)-(2,2'-(pyridine-2,6-diyl)bis(2-phenylhydrazin-2-yl-1-ylidene))bis(methanylylidene))bis(2,4-di-tert-butylphenol), H stands for dissociable proton] are pentadentate ligands. These ligands provide pyridyl N, two imine N, and two non-innocent phenoxyl and phenolato O donors, forming complex 1 as a non-radical complex, while complex 2 is a phenoxyl radical complex. The molecular structures of complexes 1 and 2 were authenticated by X-ray crystallography. Benzyl alcohol oxidation was investigated, and the conversion of 9,10-dihydroanthracene to anthracene was examined to scrutinize the H-atom abstraction reaction. Nuclease activity with complexes 1 and 2 was investigated by self-activated plasmid DNA (pBR322) cleavage. Non-innocent properties of the ligand-containing phenolato function were investigated by DFT calculations.
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Affiliation(s)
- Ovender Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Anshu Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Ankur Maji
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Rahul Chauhan
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Puneet Gupta
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Kaushik Ghosh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
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4
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Garrido MD, El Haskouri J, Marcos MD, Pérez-Pla F, Ros-Lis JV, Amorós P. One-Pot Synthesis of MnO x-SiO 2 Porous Composites as Nanozymes with ROS-Scavenging Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3503. [PMID: 36234632 PMCID: PMC9565283 DOI: 10.3390/nano12193503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 09/30/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
The development of nanomaterials that mimic the activity of enzymes is a topic of interest, for the decomposition of reactive oxygen species (ROS). We report the preparation of a novel nanocomposite of MnOx needles covered with SiO2 porous material. The material was prepared in one pot with a two-step procedure. The material was characterized by EDX, SEM, TEM, XRD, nitrogen adsorption-desorption isotherms, and XPS. The synthesis protocol took advantage of the atrane method, favoring the nucleation and initial growth of manganese oxide needles that remained embedded and homogeneously dispersed in a mesoporous silica matrix. The final composite had a high concentration of Mn (Si/Mn molar ratio of ca. 1). The nanozyme presented bimodal porosity: intraparticle and interparticle association with the surfactant micelles and the gaps between silica particles and MnOx needles, respectively. The porosity favored the migration of the reagent to the surface of the catalytic MnOx. The nanozyme showed very efficient SOD and catalase activities, thus improving other materials previously described. The kinetics were studied in detail, and the reaction mechanisms were proposed. It was shown that silica does not play an innocent role in the case of catalase activity, increasing the reaction rate.
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Affiliation(s)
- M. Dolores Garrido
- Institut de Ciència dels Materials (ICMUV), Universitat de València, Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Jamal El Haskouri
- Institut de Ciència dels Materials (ICMUV), Universitat de València, Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - María D. Marcos
- Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de Valencia, Universitat de València, Departamento de Química, Universitat Politècnica de Valencia, 46022 Valencia, Spain
- CIBER de Bioingenieria, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Francisco Pérez-Pla
- Institut de Ciència dels Materials (ICMUV), Universitat de València, Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - José Vicente Ros-Lis
- Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de Valencia, Universitat de València, Departamento de Química Inorgánica, Universitat de València, Doctor Moliner 56, 46100 Valencia, Spain
| | - Pedro Amorós
- Institut de Ciència dels Materials (ICMUV), Universitat de València, Catedrático José Beltrán 2, 46980 Paterna, Spain
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5
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Synthesis and characterization for new Mn(II) complexes; conductometry, DFT, antioxidant activity via enhancing superoxide dismutase enzymes that confirmed by in-silico and in-vitro ways. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130855] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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6
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Li J, Wei C, Han Y, Mei Y, Cheng X, Huang X, Hu C. Triazole-directed fabrication of polyoxovanadate-based metal-organic frameworks as efficient multifunctional heterogeneous catalysts for the Knoevenagel condensation and oxidation of alcohols. Dalton Trans 2021; 50:10082-10091. [PMID: 34213516 DOI: 10.1039/d1dt01413g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By introducing 4-amino-1,2,4-triazole (4-NH2-trz), three new polyoxovanadate-based metal-organic frameworks (PMOFs) [Ni3(4-NH2-trz)6][V6O18]·3H2O (1), [Co3(4-NH2-trz)6][V6O18]·3H2O (2) and [Cu3OH(4-NH2-trz)3H2O][VO3]5·H2O (3) have been synthesized and thoroughly characterized by single-crystal X-ray diffraction (SXRD), powder X-ray diffraction (PXRD), infrared spectroscopy (FT-IR), thermogravimetric (TG) analysis and elemental analysis (EA). Among them, PMOFs 1 and 2 had similar structures containing [V6O18]6- clusters; however, PMOF 3 was isolated as a structure containing a [VO3]55- cluster when the amount of the 4-NH2-trz ligand was reduced to half with the other synthesis conditions being the same as those of PMOFs 1 and 2 except for the transition-metal chlorides. Furthermore, the negative charges of polyoxovanadate [V6O18]6- and [VO3]55- anions were balanced by trinuclear complex cations [Ni3(4-NH2-trz)6]6- for 1, [Co3(4-NH2-trz)6]6- for 2 and [Cu3OH(4-NH2-trz)3H2O]5- for 3, respectively. PMOFs 1-3 were further used as heterogeneous catalysts in the Knoevenagel condensation under solvent-free conditions and showed high catalytic activity. PMOF 1 showed moderate catalytic activities in the oxidation of various aromatic alcohols using H2O2 as an oxidant. Moreover, PMOF 1 could be reused at least three times without losing its activity.
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Affiliation(s)
- Jikun Li
- College of Chemistry and Chemical Engineering, Taishan University, Tai'an, 271021, Shandong, P. R. China.
| | - Chuanping Wei
- College of Chemistry and Chemical Engineering, Taishan University, Tai'an, 271021, Shandong, P. R. China.
| | - Yinfeng Han
- College of Chemistry and Chemical Engineering, Taishan University, Tai'an, 271021, Shandong, P. R. China.
| | - Yu Mei
- College of Chemistry and Chemical Engineering, Taishan University, Tai'an, 271021, Shandong, P. R. China.
| | - Xueli Cheng
- College of Chemistry and Chemical Engineering, Taishan University, Tai'an, 271021, Shandong, P. R. China.
| | - Xianqiang Huang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry & Chemical Engineering, Liaocheng University, Liaocheng, 252059, Shandong, P. R. China.
| | - Changwen Hu
- Key Laboratory of Cluster Science Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing, 100081 P. R. China.
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7
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Singh A, Maji A, Joshi M, Choudhury AR, Ghosh K. Designed pincer ligand supported Co(II)-based catalysts for dehydrogenative activation of alcohols: Studies on N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines. Dalton Trans 2021; 50:8567-8587. [PMID: 34075925 DOI: 10.1039/d0dt03748f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Base-metal catalysts Co1, Co2 and Co3 were synthesized from designed pincer ligands L1, L2 and L3 having NNN donor atoms respectively. Co1, Co2 and Co3 were characterized by IR, UV-Vis. and ESI-MS spectroscopic studies. Single crystal X-ray diffraction studies were investigated to authenticate the molecular structures of Co1 and Co3. Catalysts Co1, Co2 and Co3 were utilized to study the dehydrogenative activation of alcohols for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines. Under optimized reaction conditions, a broad range of substrates including alcohols, anilines and ketones were exploited. A series of control experiments for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines were examined to understand the reaction pathway. ESI-MS spectral studies were investigated to characterize cobalt-alkoxide and cobalt-hydride intermediates. Reduction of styrene by evolved hydrogen gas during the reaction was investigated to authenticate the dehydrogenative nature of the catalysts. Probable reaction pathways were proposed for N-alkylation of amines, α-alkylation of ketones and synthesis of quinolines on the basis of control experiments and detection of reaction intermediates.
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Affiliation(s)
- Anshu Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
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8
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Singh O, Maji A, Singh A, Singh N, Ghosh K. A new family of complexes derived from bis(imino)pyridine‐type ligands: Crystal structures and bio‐molecular interaction studies. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ovender Singh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
- Department of Chemistry Chonnam National University Gwangju South Korea
| | - Ankur Maji
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
| | - Anshu Singh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
| | - Neetu Singh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
- Department of Chemistry Chonnam National University Gwangju South Korea
| | - Kaushik Ghosh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee India
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9
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Pitchaimani J, Rajkumar STRJ, Mahalingam SM, Philip Anthony S, Moon D, Madhu V. Coordination diversity in transition metal complexes with 4-aminoantipyrine tethered bis(imino)pyridine ligand: structures, superoxide dismutase and anticancer properties. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1853109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Jayaraman Pitchaimani
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India
| | | | - S. M. Mahalingam
- Department of Chemistry, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, India
| | | | - Dohyun Moon
- Beamline Department, Pohang Accelerator Laboratory, Pohang, Gyeongbuk, Korea
| | - Vedichi Madhu
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, India
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10
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Bouché M, Hognon C, Grandemange S, Monari A, Gros PC. Recent advances in iron-complexes as drug candidates for cancer therapy: reactivity, mechanism of action and metabolites. Dalton Trans 2020; 49:11451-11466. [PMID: 32776052 DOI: 10.1039/d0dt02135k] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this perspective, we discuss iron-complexes as drug candidates that are promising alternatives to conventional platinum-based chemotherapies owing to their broad range of reactivities and to the targeting of different biological systems. Breakthroughs in the comprehension of iron complexes' structure-activity relationship contributed to the clarification of their metabolization pathways, sub-cellular localization and influence on iron homeostasis, while enlightening the primary molecular targets of theses likely multi-target metallodrugs. Both the antiproliferative activity and elevated safety index observed among the family of iron complexes showed encouraging results as per their therapeutic potential and selectivity also with the aim of reducing chemotherapy side-effects, and facilitated more pre-clinical investigations. The purpose of this perspective is to summarize the recent advances that contributed in unveiling the intricate relationships between the structural modifications on iron-complexes and their reactivity, cellular trafficking and global mechanisms of action to broaden their use as anticancer drugs and advance to clinical evaluation.
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Affiliation(s)
- Mathilde Bouché
- Université de Lorraine, CNRS, L2CM UMR 7053, F-54000 Nancy, France.
| | - Cécilia Hognon
- Université de Lorraine, CNRS, LPCT UMR 7019, F-54000 Nancy, France
| | | | - Antonio Monari
- Université de Lorraine, CNRS, LPCT UMR 7019, F-54000 Nancy, France
| | - Philippe C Gros
- Université de Lorraine, CNRS, L2CM UMR 7053, F-54000 Nancy, France.
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11
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Alizadeh N, Salimi A, Sham TK, Bazylewski P, Fanchini G. Intrinsic Enzyme-like Activities of Cerium Oxide Nanocomposite and Its Application for Extracellular H 2O 2 Detection Using an Electrochemical Microfluidic Device. ACS OMEGA 2020; 5:11883-11894. [PMID: 32548367 PMCID: PMC7271032 DOI: 10.1021/acsomega.9b03252] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 03/23/2020] [Indexed: 05/31/2023]
Abstract
Artificial enzyme mimics have gained considerable attention for use in sensing applications due to their high stability and outstanding catalytic activity. We show that cerium oxide nanosheets (NSs) exhibit triple-enzyme mimetic activity. The oxidase-, peroxidase-, and catalase-like activities of the proposed nanoparticles are demonstrated using both colorimetric and electron paramagnetic resonance (EPR) spectroscopy. On the basis of the excellent catalytic activity of cerium oxide NSs toward hydrogen peroxide, an electrochemical approach for the high-throughput detection of H2O2 in living cells was established. This report presents an analytical microfluidic chip integrated with a cerium oxide NS mimic enzyme for the fabrication of a simple, sensitive, and low-cost electrochemical sensor. Three Au microelectrodes were fabricated on a glass substrate using photolithography, and the working electrode was functionalized using cerium oxide NSs. The operation of this biosensor is based on cerium oxide NSs and presents a high sensitivity over a wide detection range, between 100 nM and 20 mM, with a low detection limit of 20 nM and a high sensitivity threshold of 226.4 μA·cm-2·μM-1. This microfluidic sensor shows a strong response to H2O2, suggesting potential applications in monitoring H2O2 directly secreted from living cells. This sensor chip provides a promising platform for applications in the field of diagnostics and sensing.
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Affiliation(s)
- Negar Alizadeh
- Department
of Chemistry, University of Kurdistan, 66177-15175 Sanandaj, Iran
| | - Abdollah Salimi
- Department
of Chemistry, University of Kurdistan, 66177-15175 Sanandaj, Iran
- Department
of Chemistry, University of Western Ontario, 1151 Richmond St., N6A 5B7 London, Ontario, Canada
- Research
Center for Nanotechnology, University of
Kurdistan, 66177-15175 Sanandaj, Iran
| | - Tsun-Kong Sham
- Department
of Chemistry, University of Western Ontario, 1151 Richmond St., N6A 5B7 London, Ontario, Canada
| | - Paul Bazylewski
- Department
of Physics and Astronomy, University of
Western Ontario, 1151
Richmond St., N6A 3K7 London, Canada
| | - Giovanni Fanchini
- Department
of Physics and Astronomy, University of
Western Ontario, 1151
Richmond St., N6A 3K7 London, Canada
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12
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Li J, Wei C, Guo D, Wang C, Han Y, He G, Zhang J, Huang X, Hu C. Inorganic–organic hybrid polyoxovanadates based on [V4O12]4− or [VO3]22− clusters: controllable synthesis, crystal structures and catalytic properties in selective oxidation of sulfides. Dalton Trans 2020; 49:14148-14157. [DOI: 10.1039/d0dt03015e] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Three inorganic–organic hybrid polyoxovanadates have been synthesized. Among them, complex [Ni2(1-vIM)7H2O][V4O12]·H2O (1) exhibits extraordinary heterogeneous catalytic performance in the selective oxidation of sulfides using H2O2 as the oxidant.
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Affiliation(s)
- Jikun Li
- College of Chemistry and Chemical Engineering
- Taishan University
- Tai'an
- P. R. China
- Key Laboratory of Cluster Science Ministry of Education
| | - Chuanping Wei
- College of Chemistry and Chemical Engineering
- Taishan University
- Tai'an
- P. R. China
| | - Daigaojie Guo
- College of Chemistry and Chemical Engineering
- Taishan University
- Tai'an
- P. R. China
| | - Congcong Wang
- College of Chemistry and Chemical Engineering
- Taishan University
- Tai'an
- P. R. China
| | - Yinfeng Han
- College of Chemistry and Chemical Engineering
- Taishan University
- Tai'an
- P. R. China
| | - Guofang He
- College of Chemistry and Chemical Engineering
- Taishan University
- Tai'an
- P. R. China
| | - Jianping Zhang
- College of Chemistry and Chemical Engineering
- Taishan University
- Tai'an
- P. R. China
| | - Xianqiang Huang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry & Chemical Engineering
- Liaocheng University
- Liaocheng
- P. R. China
| | - Changwen Hu
- Key Laboratory of Cluster Science Ministry of Education
- Beijing Key Laboratory of Photoelectronic/Electrophotonic
- School of Chemistry
- Beijing Institute of Technology
- Beijing
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13
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Singh A, Maji A, Mohanty A, Ghosh K. Copper-based catalysts derived from salen-type ligands: synthesis of 5-substituted-1 H-tetrazoles via [3+2] cycloaddition and propargylamines via A 3-coupling reactions. NEW J CHEM 2020. [DOI: 10.1039/d0nj03081c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Base-metal copper(ii) complexes derived from unsymmetrical salen-type ligands were designed and synthesized using ligands L1H to L4H. These complexes were employed as catalysts for [3+2] cycloaddition and A3-coupling reactions.
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Affiliation(s)
- Anshu Singh
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Ankur Maji
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Aurobinda Mohanty
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Kaushik Ghosh
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
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14
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Narwane M, Chang YL, Ching WM, Tsai ML, Hsu SC. Investigation on the coordination behaviors of tris(2-pyridyl)pyrazolyl borates iron(II) complexes. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.118966] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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Alexandropoulos DI, Vignesh KR, Stamatatos TC, Dunbar KR. Rare "Janus"-faced single-molecule magnet exhibiting intramolecular ferromagnetic interactions. Chem Sci 2019; 10:1626-1633. [PMID: 30842825 PMCID: PMC6368239 DOI: 10.1039/c8sc04384a] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 11/03/2018] [Indexed: 11/21/2022] Open
Abstract
The unusual ferromagnetically coupled compound was prepared by the use of Me3SiN3 with the metal ions being exclusively bridged by end-on N3–. Th cationic molecule is a rare example of a 3d-metal cluster exhibiting a “Janus”-faced SMM behavior for the dried and wet forms.
A rare disk-like single-molecule magnet (SMM) exclusively bridged by end-on azides with a spin ground state of S = 14 was prepared by the reaction of a divalent FeII precursor with Me3SiN3 under basic conditions. AC magnetic susceptibility studies revealed unusual, “Janus”-faced SMM behavior for the dried and pristine forms of the compound attributed to solvation/de-solvation effects of the coordinated MeCN ligands which leads to alterations in the crystal field and symmetry of the metal ions. DFT calculations confirmed the ferromagnetic nature of the interactions between the FeII spin carriers with the zero-field splitting parameters D = –0.2323 cm–1 and E/D = 0.027. The results have important implications for the future study of single-molecule magnets incorporating volatile solvent molecules in the first coordination sphere of the metal ions and their effect on the relaxation dynamics.
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Affiliation(s)
| | - Kuduva R Vignesh
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , USA .
| | - Theocharis C Stamatatos
- Department of Chemistry , Brock University , 1812 Sir Isaac Brock Way , L2S 3A1 St. Catharines , Ontario , Canada .
| | - Kim R Dunbar
- Department of Chemistry , Texas A&M University , College Station , Texas 77843 , USA .
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16
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Li C, Zhong D, Huang X, Shen G, Li Q, Du J, Li Q, Wang S, Li J, Dou J. Two organic–inorganic hybrid polyoxovanadates as reusable catalysts for Knoevenagel condensation. NEW J CHEM 2019. [DOI: 10.1039/c8nj06460a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel polyoxovanadates as heterogeneous catalysts have exhibited excellent catalytic properties in the Knoevenagel condensation, especially compound 1's activity is basically maintained after three cycles.
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Martínez-Camarena Á, Llinares JM, Domenech-Carbó A, Alarcón J, García-España E. A step forward in the development of superoxide dismutase mimetic nanozymes: the effect of the charge of the surface on antioxidant activity. RSC Adv 2019; 9:41549-41560. [PMID: 35541615 PMCID: PMC9076486 DOI: 10.1039/c9ra08992f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 12/07/2019] [Indexed: 12/03/2022] Open
Abstract
Two binucleating hezaaza macrocycles containing a pyridinol spacer have been prepared and characterised. Protonation studies indicate the deprotonation of the phenol group at relatively low pH values with the concomitant occurrence of a keto-enolic equilibrium. These ligands readily form binuclear Cu2+ and Zn2+ complexes as denoted by potentiometric and spectroscopic studies. The binding of the metals yields to the ready deprotonation of the phenol with the stabilisation of the keto form that results in complexes of greater stabilities than the analogous ones containing pyridine as spacer instead of pyridine. Mixed Cu2+–Zn2+-complexes were also detected in aqueous solutions containing equimolar amounts of Cu2+, Zn2+ and ligands. The binuclear Cu2+ complexes show significant SOD activity as proved by the McCord–Fridovich assays. The binuclear Cu2+ complexes of the ligands grafted to boehmite nanoparticles (BNPs) show a remarkable increase in SOD activity, which reaches 8-fold in one of the systems. The observed increase can be ascribed to the positive ζ-potential of the BNPs since the same complexes anchored to silica nanoparticles with negative ζ-potential do not show any apparent increase in activity. This behaviour is reminiscent of the positively charged funnel found in CuZnSOD, which has the electroactive copper ion at its end. Binuclear Cu2+ complexes of a pyridinophane polyamine ligand grafted to boehmite nanoparticles show a remarkable increase in SOD activity, which can be ascribed to the positive ζ-potential of the nanoparticles.![]()
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Affiliation(s)
| | - José M. Llinares
- ICMol
- Departamento de Química Inorgánica
- Universidad de Valencia
- Paterna
- Spain
| | | | - Javier Alarcón
- Departamento de Química Inorgánica
- Universidad de Valencia
- Burjassot
- Spain
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Piotrowska-Kirschling A, Drzeżdżon J, Kloska A, Wyrzykowski D, Chmurzyński L, Jacewicz D. Antioxidant and Cytoprotective Activity of Oxydiacetate Complexes of Cobalt(II) and Nickel(II) with 1,10-Phenantroline and 2,2'-Bipyridine. Biol Trace Elem Res 2018; 185:244-251. [PMID: 29372436 DOI: 10.1007/s12011-018-1243-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 01/09/2018] [Indexed: 02/02/2023]
Abstract
The antioxidant properties of oxydiacetate complexes of cobalt(II) and nickel(II) with 1,10-phenantroline and 2,2'-bipyridine have been investigated towards the superoxide radical using the nitro blue tetrazolium chloride (NBT) test and the cyclic voltammetry (CV). Moreover, the biological activity of the complexes under study has been investigated in the Human Dermal Fibroblasts adult (HDFa) cell line. In the first step, the cytotoxic and the antiproliferative activities of the complexes were examined. Subsequently, the cytoprotective properties of the complexes have been investigated in an oxidative stress conditions induced by H2O2.
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Affiliation(s)
| | - Joanna Drzeżdżon
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Anna Kloska
- Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308, Gdańsk, Poland
| | - Dariusz Wyrzykowski
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Lech Chmurzyński
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Dagmara Jacewicz
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland.
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Merlini ML, Britovsek GJP, Swart M, Belanzoni P. Understanding the Catalase-Like Activity of a Bioinspired Manganese(II) Complex with a Pentadentate NSNSN Ligand Framework. A Computational Insight into the Mechanism. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03559] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maria Letizia Merlini
- Laboratoire de Chimie et Biochimie Computationnelles, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), Av. F.-A. Forel 2, CH-1015 Lausanne, Switzerland
| | - George J. P. Britovsek
- Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom
| | - Marcel Swart
- Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, Facultat de Ciències, 17003 Girona, Spain
- Institució Catalana de Recerca i Estudis Avançats ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Paola Belanzoni
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
- Istituto di Scienze e Tecnologie Molecolari del CNR CNR-ISTM, c/o Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
- Consortium for Computational Molecular and Materials Sciences (CMS)2, via Elce di Sotto 8, 06123 Perugia, Italy
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