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Polyoxometalates
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Polyoxometalates

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Inorganic Chemistry".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 13165

Special Issue Editors

Dr. Israël M. Mbomekallé

E-Mail Website
Guest Editor
Equipe d’Electrochimie et de Photo-électrochimie, Laboratoire de Chimie Physique, Univ Paris Sud, UMR 8000 CNRS, Université Paris-Saclay, F-91405 Orsay, France
Interests: electrochemistry; polyoxometalates; nanomaterials
Dr. Xavier López

E-Mail Website
Guest Editor
Quantum Chemistry Group, Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, 43007 Tarragona, Spain
Interests: computation; polyoxometalates; molecular metal wires

Special Issue Information

Dear Colleagues,

The study of polyoxometalates and their applications in various scientific fields has produced an increasing number of papers year after year. It seems obvious to us that the polyoxometalates community, of which you are part of, should take stock of recent discoveries whenever possible. In this Molecules Special Issue on “Polyoxometalates”, we are providing you the opportunity to publish your results as communications, full articles, or reviews that will undergo rigorous peer review and be indexed by Web of Science and Scopus, ensuring high visibility.

The deadline for submitting your contribution is 31 October 2020. We look forward to receiving your contribution.

Dr. Israël M. Mbomekallé
Dr. Xavier López
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • novel architectures
  • reactivity and mechanistic studies
  • electrochemistry and magnetism
  • computational studies
  • biological applications
  • electrophotocatalysis
  • energy conversion and storage
  • devices

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Published Papers (4 papers)

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Research

12 pages, 2824 KiB  
Article
Supramolecular Association between γ-Cyclodextrin and Preyssler-Type Polyoxotungstate
by Nathalie Leclerc, Mohamed Haouas, Clément Falaise, Serge Al Bacha, Loïc Assaud and Emmanuel Cadot
Molecules 2021, 26(17), 5126; https://doi.org/10.3390/molecules26175126 - 24 Aug 2021
Cited by 9 | Viewed by 2853
Abstract
The development of hybrid materials based on polyoxometalates constitutes a strategy for the design of multifunctional materials. The slow evaporation of an aqueous solution of [NaP5W30O110]14− in the presence of γ-Cyclodextrin (γ-CD) led to the crystallization [...] Read more.
The development of hybrid materials based on polyoxometalates constitutes a strategy for the design of multifunctional materials. The slow evaporation of an aqueous solution of [NaP5W30O110]14− in the presence of γ-Cyclodextrin (γ-CD) led to the crystallization of a K6Na8{[NaP5W30O110]•(C48H80O40)}•23H2O (NaP5W30•1CD) supramolecular compound, which was characterized by single-crystal X-ray diffraction, IR-spectroscopy, thermogravimetric and elemental analyses. Structural analysis revealed the formation of 1:1 {[NaP5W30O110]•[γ-CD]}14− adduct in the solid state. Studies in solution by cyclic voltammetry, electrochemical impedance spectroscopy, 1H NMR spectroscopy, and 31P DOSY, have demonstrated weak interactions between the inorganic anion and the macrocyclic organic molecule. Full article
(This article belongs to the Special Issue Polyoxometalates)
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18 pages, 5018 KiB  
Article
Synthesis, Physical Properties and Application of a Series of New Polyoxometalate-Based Ionic Liquids
by Yohan Martinetto, Salomé Basset, Bruce Pégot, Catherine Roch-Marchal, Franck Camerel, Jelena Jeftic, Betty Cottyn-Boitte, Emmanuel Magnier and Sébastien Floquet
Molecules 2021, 26(2), 496; https://doi.org/10.3390/molecules26020496 - 18 Jan 2021
Cited by 4 | Viewed by 3409
Abstract
This paper deals with the preparation and the characterization of four new ionic liquids resulting from the pairing of various polyoxotungstates or polyoxomolybdates with the cation trihexyltetradecylphosphonium. The physical properties measured by different techniques evidence that the viscosity and the rheological behaviors of [...] Read more.
This paper deals with the preparation and the characterization of four new ionic liquids resulting from the pairing of various polyoxotungstates or polyoxomolybdates with the cation trihexyltetradecylphosphonium. The physical properties measured by different techniques evidence that the viscosity and the rheological behaviors of such POM-based ionic liquids, POM-ILs, strongly depend on the nature of the POM, especially its charge. Playing on the nature of the POM, we can indeed obtain Newtonian liquids or some much more viscous materials exhibiting characteristics of resins or pseudo-plastics. In a second part of this study, the potentialities of using such materials both as solvent and catalyst for the oxidation of a series of alcohols are presented as proof of concept. This part highlights great differences in strength and selectivity as a function of the POM-IL used. Furthermore, a very simple way to recycle the catalyst is also presented. Full article
(This article belongs to the Special Issue Polyoxometalates)
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Figure 1

12 pages, 2308 KiB  
Article
Synthesis, Characterization, Electrochemistry, Photoluminescence and Magnetic Properties of a Dinuclear Erbium(III)-Containing Monolacunary Dawson-Type Tungstophosphate: [{Er(H2O)(CH3COO)(P2W17O61)}2]16−
by Masooma Ibrahim, Ananya Baksi, Yan Peng, Firas Khalil Al-Zeidaneen, Israël M. Mbomekallé, Pedro de Oliveira and Christopher E. Anson
Molecules 2020, 25(18), 4229; https://doi.org/10.3390/molecules25184229 - 15 Sep 2020
Cited by 2 | Viewed by 3056
Abstract
Reaction of the trilacunary Wells−Dawson anion {α-P2W15O56}12− with ErIII ion in a 1 M LiOAc/HOAc buffer (pH 4.8) solution produces a dinuclear erbium(III) substituted sandwich-type structure [{Er(H2O)(CH3COO)(P2W17O [...] Read more.
Reaction of the trilacunary Wells−Dawson anion {α-P2W15O56}12− with ErIII ion in a 1 M LiOAc/HOAc buffer (pH 4.8) solution produces a dinuclear erbium(III) substituted sandwich-type structure [{Er(H2O)(CH3COO)(P2W17O61)}2]16− (1). The isolated compound was structurally characterized using single crystal and powder X-ray diffraction, FTIR spectroscopy, mass spectrometry and thermogravimetric analysis. The electrochemical, electrocatalytic, photoluminescence and magnetic properties of 1 were investigated. Full article
(This article belongs to the Special Issue Polyoxometalates)
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13 pages, 2300 KiB  
Article
Selective Hydrolysis of Transferrin Promoted by Zr-Substituted Polyoxometalates
by Laura S. Van Rompuy, Nada D. Savić, Alvaro Rodriguez and Tatjana N. Parac-Vogt
Molecules 2020, 25(15), 3472; https://doi.org/10.3390/molecules25153472 - 30 Jul 2020
Cited by 18 | Viewed by 3137
Abstract
The hydrolysis of the iron-binding blood plasma glycoprotein transferrin (Tf) has been examined at pH = 7.4 in the presence of a series of Zr-substituted polyoxometalates (Zr-POMs) including Keggin (Et2NH2)10[Zr(PW11O39)2]∙7H2 [...] Read more.
The hydrolysis of the iron-binding blood plasma glycoprotein transferrin (Tf) has been examined at pH = 7.4 in the presence of a series of Zr-substituted polyoxometalates (Zr-POMs) including Keggin (Et2NH2)10[Zr(PW11O39)2]∙7H2O (Zr-K 1:2), (Et2NH2)8[{α-PW11O39Zr-(μ-OH) (H2O)}2]∙7H2O (Zr-K 2:2), Wells-Dawson K15H[Zr(α2-P2W17O61)2]·25H2O (Zr-WD 1:2), Na14[Zr4(α-P2W16O59)2(μ3-O)2(μ-OH)2(H2O)4]·57H2O (Zr-WD 4:2) and Lindqvist (Me4N)2[ZrW5O18(H2O)3] (Zr-L 1:1), (nBu4N)6[(ZrW5O18(μ–OH))2]∙2H2O (Zr-L 2:2)) type POMs. Incubation of transferrin with Zr-POMs resulted in formation of 13 polypeptide fragments that were observed on sodium dodecyl sulfate poly(acrylamide) gel electrophoresis (SDS-PAGE), but the hydrolysis efficiency varied depending on the nature of Zr-POMs. Molecular interactions between Zr-POMs and transferrin were investigated by using a range of complementary techniques such as tryptophan fluorescence, circular dichroism (CD), 31P-NMR spectroscopy, in order to gain better understanding of different efficiency of investigated Zr-POMs. A tryptophan fluorescence quenching study revealed that the most reactive Zr-WD species show the strongest interaction toward transferrin. The CD results demonstrated that interaction of Zr-POMs and transferrin in buffer solution result in significant secondary structure changes. The speciation of Zr-POMs has been followed by 31P-NMR spectroscopy in the presence and absence of transferrin, providing insight into stability of the catalysts under reaction condition. Full article
(This article belongs to the Special Issue Polyoxometalates)
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