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Onkarappa SB, Javoor M, Mal SS, Dutta S. Efficient and Scalable Production of Alkyl Levulinates from Cellulose-Derived Levulinic Acid Using Heteropolyacid Catalysts. ChemistrySelect 2019. [DOI: 10.1002/slct.201803641] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | - Manjunath Javoor
- Department of Chemistry; National Institute of Technology Karnataka (NITK), Surathkal, Mangalore-; 575025, Karnataka India
| | - Sib Sankar Mal
- Department of Chemistry; National Institute of Technology Karnataka (NITK), Surathkal, Mangalore-; 575025, Karnataka India
| | - Saikat Dutta
- Department of Chemistry; National Institute of Technology Karnataka (NITK), Surathkal, Mangalore-; 575025, Karnataka India
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Modrzynski C, Burger P. Energy storage inspired by nature - ionic liquid iron-sulfur clusters as electrolytes for redox flow batteries. Dalton Trans 2019; 48:1941-1946. [PMID: 30633269 DOI: 10.1039/c8dt03776k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The redox flow battery (RFB) is a promising technology for the storage of electric energy. Many commercial RFBs are often based on acidic vanadium electrolyte solutions that have limitations regarding stability and energy density. Here, a new approach is presented that is inspired by nature's electron storage, i.e. iron-sulfur clusters [Fe4S4(SR)4]2-. In combination with imidazolium cations, new ionic liquid electrolyte materials were obtained and characterized with regard to their physico- and electrochemical properties. For flow battery tests, the bromide/bromine redox-couple was used in the second half cell in an ionic liquid solution. In these measurements, liquid iron-sulfur clusters show high coulombic (>95%) and energy (69%) efficiencies combined with a high theoretical energy density (88 W h L-1).
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Affiliation(s)
- Christian Modrzynski
- Institut für Anorganische und Angewandte Chemie, Department Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
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Treviño S, González-Vergara E. Metformin-decavanadate treatment ameliorates hyperglycemia and redox balance of the liver and muscle in a rat model of alloxan-induced diabetes. NEW J CHEM 2019. [DOI: 10.1039/c9nj02460c] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
MetfDeca treatment ameliorate glucose and insulin levels, and reduce the levels of oxidized glutathione, reactive oxygen species, malondialdehyde, and 4-hydroxyalkenal; the superoxide and catalase activities, and glutathione levels were regulated.
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Affiliation(s)
- Samuel Treviño
- Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla
- Puebla
- Mexico
| | - Enrique González-Vergara
- Laboratorio de Bioinorgánica Aplicada
- Centro de Química ICUAP
- Benemérita Universidad Autónoma de Puebla
- Puebla
- Mexico
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Sánchez-Lara E, Treviño S, Sánchez-Gaytán BL, Sánchez-Mora E, Eugenia Castro M, Meléndez-Bustamante FJ, Méndez-Rojas MA, González-Vergara E. Decavanadate Salts of Cytosine and Metformin: A Combined Experimental-Theoretical Study of Potential Metallodrugs Against Diabetes and Cancer. Front Chem 2018; 6:402. [PMID: 30333969 PMCID: PMC6176007 DOI: 10.3389/fchem.2018.00402] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [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: 06/29/2018] [Accepted: 08/20/2018] [Indexed: 01/15/2023] Open
Abstract
Cytosine, a DNA and RNA building-block, and Metformin, the most widely prescribed drug for the treatment of Type 2 Diabetes mellitus were made to react separately with ammonium or sodium metavanadates in acidic aqueous solutions to obtain two polyoxovanadate salts with a 6:1 ratio of cation-anion. Thus, compounds [HCyt]6[V10O28]·4H2O, 1 and [HMetf]6[V10O28]·6H2O, 2 (where HCyt = Cytosinium cation, [C4H6N3O]+ and HMetf = Metforminium cation, [C4H12N5]+) were obtained and characterized by elemental analysis, single crystal X-ray diffraction, vibrational spectroscopy (IR and Raman), solution 51V-NMR, thermogravimetric analysis (TGA-DTGA), as well as, theoretical methods. Both compounds crystallized in P1 ¯ space group with Z' = 1/2, where the anionic charge of the centrosymmetric ion [V10O28]6- is balanced by six Cytosinium and six Metforminium counterions, respectively. Compound 1 is stabilized by π-π stacking interactions coming from the aromatic rings of HCyt cations, as denoted by close contacts of 3.63 Å. On the other hand, guanidinium moieties from the non-planar HMetf in Compound 2 interact with decavanadate μ2-O atoms via N-H···O hydrogen bonds. The vibrational spectroscopic data of both IR and Raman spectra show that the dominant bands in the 1000-450 cm-1 range are due to the symmetric and asymmetric ν(V-O) vibrational modes. In solution, 51V-NMR experiments of both compounds show that polyoxovanadate species are progressively transformed into the monomeric, dimeric and tetrameric oxovanadates. The thermal stability behavior suggests a similar molecular mechanism regarding the loss of water molecules and the decomposition of the organic counterions. Yet, no changes were observed in the TGA range of 540-580°C due to the stability of the [V10O28]6- fragment. Dispersion-corrected density functional theory (DFT-D) calculations were carried out to model the compounds in aqueous phase using a polarized continuum model calculation. Optimized structures were obtained and the main non-covalent interactions were characterized. Biological activities of these compounds are also under investigation. The combination of two therapeutic agents opens up a window toward the generation of potential metalopharmaceuticals with new and exciting pharmacological properties.
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Affiliation(s)
- Eduardo Sánchez-Lara
- Centro de Química del Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
| | - Samuel Treviño
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
| | - Brenda L. Sánchez-Gaytán
- Centro de Química del Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
| | - Enrique Sánchez-Mora
- Instituto de Física “Luis Rivera Terrazas”, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
| | - María Eugenia Castro
- Centro de Química del Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
| | | | - Miguel A. Méndez-Rojas
- Departamento de Ciencias Químico-Biológicas, Universidad de las Américas Puebla, Puebla, Mexico
| | - Enrique González-Vergara
- Centro de Química del Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico
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Kibler AJ, Martín C, Cameron JM, Rogalska A, Dupont J, Walsh DA, Newton GN. Physical and Electrochemical Modulation of Polyoxometalate Ionic Liquids via Organic Functionalization. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800578] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Alexander J. Kibler
- GSK Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus NG7 2GA Nottingham UK
| | - Carmen Martín
- GSK Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus NG7 2GA Nottingham UK
| | - Jamie M. Cameron
- GSK Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus NG7 2GA Nottingham UK
| | - Agata Rogalska
- GSK Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus NG7 2GA Nottingham UK
| | - Jairton Dupont
- GSK Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus NG7 2GA Nottingham UK
- UFRGS; Institute of Chemistry; Av. Bento Gonçalves, 9500 91501-970 Porto Alegre Rio Grande do Sul Brazil
| | - Darren A. Walsh
- GSK Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus NG7 2GA Nottingham UK
| | - Graham N. Newton
- GSK Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus NG7 2GA Nottingham UK
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Mihaylov TT, Ly HGT, Pierloot K, Parac-Vogt TN. Molecular Insight from DFT Computations and Kinetic Measurements into the Steric Factors Influencing Peptide Bond Hydrolysis Catalyzed by a Dimeric Zr(IV)-Substituted Keggin Type Polyoxometalate. Inorg Chem 2016; 55:9316-28. [DOI: 10.1021/acs.inorgchem.6b01461] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Tzvetan T. Mihaylov
- Laboratory of Computational Coordination
Chemistry, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Hong Giang T. Ly
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Kristine Pierloot
- Laboratory of Computational Coordination
Chemistry, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Tatjana N. Parac-Vogt
- Laboratory of Bioinorganic Chemistry, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
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Wendt M, Warzok U, Näther C, van Leusen J, Kögerler P, Schalley CA, Bensch W. Catalysis of "outer-phase" oxygen atom exchange reactions by encapsulated "inner-phase" water in {V 15Sb 6}-type polyoxovanadates. Chem Sci 2016; 7:2684-2694. [PMID: 28660041 PMCID: PMC5477048 DOI: 10.1039/c5sc04571a] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 01/08/2016] [Indexed: 01/27/2023] Open
Abstract
A water molecule encapsulated inside water-soluble {V15Sb6} antimonato polyoxovanadate cages accelerates oxygen-exchange reactions in the cluster periphery.
Antimonato polyoxovanadate (POV) cluster compounds {M(en)3}3[V15Sb6O42(H2O)x]·nH2O (M = FeII, CoII, NiII and x = 0 or 1) obtained under solvothermal conditions exhibit unusual high water solubility making these compounds promising synthons for generation of new POV structure types. Electrospray ionization mass spectrometry provides evidence (i) for a water molecule encapsulated inside the cavity of a fraction of the spherical cluster shells, (ii) for a post-functionalization in water, namely a slow exchange of VO against Sb2O, (iii) for the inner-phase reactivity of the encapsulated water that is capable of opening an oxo-bridge, and (iv) for a significant acceleration of the 16O/18O exchange reactions of oxygen atoms in the cluster periphery with surrounding H218O, when encapsulated water is present. To the best of our knowledge, this is the first example in polyoxovanadate chemistry for the transduction of inner-phase reactivity of an encapsulated guest molecule into changes in the outer-phase reactivity of the cluster. Magnetic susceptibility measurements reflect the individual contributions of the frustrated {V15} spin polytope and the {M(en)3}2+ complexes, with very weak coupling between these groups.
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Affiliation(s)
- Michael Wendt
- Institut für Anorganische Chemie , Christian-Albrechts-Universität zu Kiel , Max-Eyth-Str. 2 , 24118 Kiel , Germany .
| | - Ulrike Warzok
- Institut für Chemie und Biochemie der Freien Universität , Takustr. 3 , 14195 Berlin , Germany .
| | - Christian Näther
- Institut für Anorganische Chemie , Christian-Albrechts-Universität zu Kiel , Max-Eyth-Str. 2 , 24118 Kiel , Germany .
| | - Jan van Leusen
- Institut für Anorganische Chemie , RWTH Aachen , Landoltweg 1 , 52074 Aachen , Germany
| | - Paul Kögerler
- Institut für Anorganische Chemie , RWTH Aachen , Landoltweg 1 , 52074 Aachen , Germany
| | - Christoph A Schalley
- Institut für Chemie und Biochemie der Freien Universität , Takustr. 3 , 14195 Berlin , Germany .
| | - Wolfgang Bensch
- Institut für Anorganische Chemie , Christian-Albrechts-Universität zu Kiel , Max-Eyth-Str. 2 , 24118 Kiel , Germany .
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Sánchez-Lombardo I, Baruah B, Alvarez S, Werst KR, Segaline NA, Levinger NE, Crans DC. Size and shape trump charge in interactions of oxovanadates with self-assembled interfaces: application of continuous shape measure analysis to the decavanadate anion. NEW J CHEM 2016. [DOI: 10.1039/c5nj01788b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using 51V NMR spectroscopy, dynamic light scattering and continuous shape analysis to characterize two polyoxometalate-encapsulation in reverse micelles.
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Affiliation(s)
| | - Bharat Baruah
- Department of Chemistry
- Colorado State University
- Colorado 80523-1872
- USA
- Department of Chemistry
| | - Santiago Alvarez
- Departament de Química Inorganica
- Institut de Química Teorica i Computacional (IQTCUB)
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Katarina R. Werst
- Department of Chemistry
- Colorado State University
- Colorado 80523-1872
- USA
| | | | - Nancy E. Levinger
- Department of Chemistry
- Colorado State University
- Colorado 80523-1872
- USA
| | - Debbie C. Crans
- Department of Chemistry
- Colorado State University
- Colorado 80523-1872
- USA
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Abstract
Polyoxovanadates (POVs), known for their wide applicability and relevance in chemical, physical and biological sciences, are a subclass of polyoxometalates and usually self-assemble in aqueous-phase, pH-controlled condensation reactions. Archetypical POVs such as the robust [VO42](12-) polyoxoanion can be structurally, electronically and magnetically altered by heavier group 14 and 15 elements to afford Si-, Ge-, As- or Sb-decorated POV structures (heteroPOVs). These main-group semimetals introduce specific chemically engineered functionalities which cause the generally hydrophilic heteroPOV compounds to exhibit interesting reactivity towards organic molecules, late transition metal and lanthanoid ions. The fully-oxidised (V(V)), mixed-valent (V(V)/V(IV) and V(IV)/V(III)), "fully-reduced" (V(IV)) and "highly-reduced" (V(III)) heteroPOVs possess a number of intriguing properties, ranging from catalytic to molecular magnet characteristics. Herein, we review key developments in the synthetic and structural chemistry as well as the reactivity of POVs functionalised with Si-, Ge-, As- or Sb-based heterogroups.
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Affiliation(s)
- Kirill Yu Monakhov
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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Sánchez-Lombardo I, Sánchez-Lara E, Pérez-Benítez A, Mendoza Á, Bernès S, González-Vergara E. Synthesis of Metforminium(2+) Decavanadates - Crystal Structures and Solid-State Characterization. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402277] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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