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Ibrahim M, Mbomekallé IM, de Oliveira P, Bergfeldt T, Anson CE. An Inorganic Pac‐Man: Synthesis, structure and electrochemical studies of a heterometallic {YCoII3W} cluster sandwiched by two germanotungstates. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Masooma Ibrahim
- Karlsruher Institut fur Technologie - Campus Nord Institute of Nanotechnology Hermann-von-Helmholtz-Platz 1 Karlsruhe GERMANY
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Ibrahim M, Mbomekallé IM, de Oliveira P, Baksi A, Carter AB, Peng Y, Bergfeldt T, Malik S, Anson CE. Syntheses, Crystal Structure, Electrocatalytic, and Magnetic Properties of the Monolanthanide-Containing Germanotungstates [Ln(H 2O) n GeW 11O 39] 5- (Ln = Dy, Er, n = 4,3). ACS Omega 2019; 4:21873-21882. [PMID: 31891065 PMCID: PMC6933596 DOI: 10.1021/acsomega.9b02846] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
Two monolanthanide-containing polyanions based on monolacunary Keggin germanotungstates [Ln(H2O) n GeW11O39]5- (Ln = Dy, Er, n = 4,3) have been synthesized in simple one-pot synthetic procedure and compositionally characterized in solid state by single-crystal X-ray diffraction, powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and elemental analysis. Electronic absorption and emission spectra of the title compounds in solution were also studied. The [DyIII(H2O)4GeW11O39]5- Keggin POM exhibits a slow relaxation of magnetization. The cyclic voltammetry measurements and mass spectrometry were carried out to check the stability of the compounds in solution. Both polyanions prove efficient in the electrocatalytic reduction of nitrite. To our knowledge, this observation establishes the first example of electrocatalysis of nitrite reduction by all inorganic monolanthanide-containing germanotungstates family.
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Affiliation(s)
- Masooma Ibrahim
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology, Hermann von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Israël M. Mbomekallé
- Equipe
d'Electrochimie et Photo-électrochimie, Laboratoire de
Chimie
Physique, Université Paris-Sud, UMR 8000, CNRS-Université
Paris Saclay, Orsay F-91405, France
| | - Pedro de Oliveira
- Equipe
d'Electrochimie et Photo-électrochimie, Laboratoire de
Chimie
Physique, Université Paris-Sud, UMR 8000, CNRS-Université
Paris Saclay, Orsay F-91405, France
| | - Ananya Baksi
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology, Hermann von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Anthony B. Carter
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Engesserstrasse
15, 76128 Karlsruhe, Germany
- School
of Chemistry University of Southampton University Road, SO17 1BJ Southampton, U.K.
| | - Yan Peng
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Engesserstrasse
15, 76128 Karlsruhe, Germany
| | - Thomas Bergfeldt
- Institutes
for Applied Materials (IAM-AWP), Karlsruhe
Institute of Technology (KIT), 76131 Karlsruhe, Germany
| | - Sharali Malik
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology, Hermann von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Christopher E. Anson
- Institute
of Inorganic Chemistry, Karlsruhe Institute
of Technology, Engesserstrasse
15, 76128 Karlsruhe, Germany
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Ibrahim M, Mbomekallé IM, de Oliveira P, Kostakis GE, Anson CE. Synthesis, structure and electrochemical characterization of an isopolytungstate (W4O16) held by MnII anchors within a superlacunary crown heteropolyanion {P8W48}. Dalton Trans 2019; 48:15545-15552. [DOI: 10.1039/c9dt02478f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The first example of an isopolyanion (W4O16) held by redox-active MnII anchors within an archetypal superlacunary heteropolyanion {P8W48}.
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Affiliation(s)
- Masooma Ibrahim
- Institute of Nanotechnology
- Karlsruhe Institute of Technology
- 76344 Eggenstein-Leopoldshafen
- Germany
| | - Israël M. Mbomekallé
- Equipe d'Electrochimie et Photo-électrochimie
- Laboratoire de Chimie Physique
- Université Paris-Sud
- UMR 8000
- CNRS-Université Paris Saclay
| | - Pedro de Oliveira
- Equipe d'Electrochimie et Photo-électrochimie
- Laboratoire de Chimie Physique
- Université Paris-Sud
- UMR 8000
- CNRS-Université Paris Saclay
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Gupta R, Khan I, Hussain F, Bossoh AM, Mbomekallé IM, de Oliveira P, Sadakane M, Kato C, Ichihashi K, Inoue K, Nishihara S. Two New Sandwich-Type Manganese {Mn5}-Substituted Polyoxotungstates: Syntheses, Crystal Structures, Electrochemistry, and Magnetic Properties. Inorg Chem 2017; 56:8759-8767. [DOI: 10.1021/acs.inorgchem.6b02994] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Rakesh Gupta
- Department of Chemistry, University of Delhi, North Campus, 110007 Delhi, India
| | - Imran Khan
- Department of Chemistry, University of Delhi, North Campus, 110007 Delhi, India
| | - Firasat Hussain
- Department of Chemistry, University of Delhi, North Campus, 110007 Delhi, India
| | - A. Martin Bossoh
- Laboratoire de Chimie
Physique, UMR 8000, CNRS, Université Paris-Sud, Orsay F-91405, France
- Université Félix Houphouët-Boigny, 01 BP V34 Abidjan 01, Ivory Coast
| | - Israël M. Mbomekallé
- Laboratoire de Chimie
Physique, UMR 8000, CNRS, Université Paris-Sud, Orsay F-91405, France
| | - Pedro de Oliveira
- Laboratoire de Chimie
Physique, UMR 8000, CNRS, Université Paris-Sud, Orsay F-91405, France
| | - Masahiro Sadakane
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi, Hiroshima 732-8527, Japan
| | - Chisato Kato
- Graduate School of Science & Center for Chiral Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima 732-8526, Japan
| | - Katsuya Ichihashi
- Graduate School of Science & Center for Chiral Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima 732-8526, Japan
| | - Katsuya Inoue
- Graduate School of Science & Center for Chiral Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima 732-8526, Japan
| | - Sadafumi Nishihara
- Graduate School of Science & Center for Chiral Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi, Hiroshima 732-8526, Japan
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Ayingone Mezui CS, de Oliveira P, Teillout AL, Marrot J, Berthet P, Lebrini M, Mbomekallé IM. Synthesis, Structure, and Magnetic Electrochemical Properties of a Family of Tungstoarsenates Containing Just Co II Centers or Both Co II and Fe III Centers. Inorg Chem 2017; 56:1999-2012. [PMID: 28177256 DOI: 10.1021/acs.inorgchem.6b02593] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The three polyoxotungstates [(NaOH2)2CoII2(As2W15O56)2]18- (1), [(NaOH2)(CoIIOH2)CoII2(As2W15O56)2]17- (2), and [(CoIIOH2)2CoII2(As2W15O56)2]16- (3) have been prepared in aqueous solution upon mixing cobalt(II) salts with the ligand [As2W15O56]12-. The reaction of 1 or 2 with the Fe3+ ion leads invariably to the same species [(FeIIIOH2)(CoIIOH2)CoII2(As2W15O56)2]15- (4) possessing three cobalt atoms and a single iron atom. However, if the Fe-containing homologue of compound 1, that is, the polyoxotungstate [(NaOH2)2FeIII2(As2W15O56)2]16- (5), is employed instead to react with the Co2+ ion, the species [(CoIIOH2)2FeIII2(As2W15O56)2]14- (6) is obtained, having two cobalt atoms and two iron atoms. The compounds 1, 2, 3, 4, and 6 are described for the first time and have been characterized by several physicochemical methods such as FTIR, UV-visible, ATG, and elemental analysis. Structural analysis by single-crystal X-ray diffraction has been carried out with compounds 2 (monoclinic space group P21/c, a = 17.0622(5) Å, b = 15.0828(4) Å, c = 32.0872(8) Å, β = 91.170(1)°, and Z = 2) and 3 (triclinic space group P1̅, a = 13.6137(7) Å, b = 13.8836(8) Å, c = 22.9276(6) Å, α = 89.906(3)°, β = 78.356(2)°, γ = 61.451(2)°, and Z = 1). Electrochemical studies undertaken with all the above-mentioned compounds and some of their homologues shed light on the influence of the chemical composition on their electrocatalytic properties toward substrates such as the nitrite ion and dioxygen. Magnetic measurements evidence anisotropic ferromagnetic interactions between Co2+ ions and antiferromagnetic interactions between Fe3+ ions. The nature and the strength of the Co2+-Fe3+ interactions depend on the relative orientations of their 3d orbitals. The effective magnetic moment of the Co2+ ions varies with the temperature and with the distortion of the octahedral sites in which they are located.
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Affiliation(s)
- Charyle S Ayingone Mezui
- Equipe d'Electrochimie et de Photo-électrochimie, Laboratoire de Chimie Physique, Université Paris-Sud, UMR 8000 CNRS, Université Paris-Saclay , Orsay, F-91405, France
| | - Pedro de Oliveira
- Equipe d'Electrochimie et de Photo-électrochimie, Laboratoire de Chimie Physique, Université Paris-Sud, UMR 8000 CNRS, Université Paris-Saclay , Orsay, F-91405, France
| | - Anne-Lucie Teillout
- Equipe d'Electrochimie et de Photo-électrochimie, Laboratoire de Chimie Physique, Université Paris-Sud, UMR 8000 CNRS, Université Paris-Saclay , Orsay, F-91405, France
| | - Jérôme Marrot
- Institut Lavoisier de Versailles, Université de Versailles St. Quentin, UMR 8180 CNRS, Université Paris-Saclay , Versailles, F-78035, France
| | - Patrick Berthet
- Equipe Synthèse Propriétés et Modélisation des Matériaux, ICMMO, Université Paris-Sud, UMR 8182 CNRS, Université Paris-Saclay , Orsay, F-91405, France
| | - Mounim Lebrini
- Institut Lavoisier de Versailles, Université de Versailles St. Quentin, UMR 8180 CNRS, Université Paris-Saclay , Versailles, F-78035, France
| | - Israël M Mbomekallé
- Equipe d'Electrochimie et de Photo-électrochimie, Laboratoire de Chimie Physique, Université Paris-Sud, UMR 8000 CNRS, Université Paris-Saclay , Orsay, F-91405, France
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Liu W, Al-Oweini R, Meadows K, Bassil BS, Lin Z, Christian JH, Dalal NS, Bossoh AM, Mbomekallé IM, de Oliveira P, Iqbal J, Kortz U. Cr III-Substituted Heteropoly-16-Tungstates [Cr III2(B-β-X IVW 8O 31) 2] 14- (X = Si, Ge): Magnetic, Biological, and Electrochemical Studies. Inorg Chem 2016; 55:10936-10946. [PMID: 27768287 DOI: 10.1021/acs.inorgchem.6b01458] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The dichromium(III)-containing heteropoly-16-tungstates [CrIII2(B-β-SiIVW8O31)2]14- (1) and [CrIII2(B-β-GeIVW8O31)2]14- (2) were prepared via a one-pot reaction of the composing elements in aqueous, basic medium. Polyanions 1 and 2 represent the first examples of CrIII-containing heteropolytungstates comprising the octatungstate unit {XW8O31} (X = Si, Ge). Magnetic studies demonstrated that, in the solid state, the two polyanions exhibit a weak antiferromagnetic interaction between the two CrIII centers with J = -3.5 ± 0.5 cm-1, with no long-range ordering down to 1.8 K. The ground-state spin of polyanions 1 and 2 was thus deduced to be 0, but the detection of a complex set of EPR signals implies that there are thermally accessible excited states containing unpaired spins resulting from the two S = 3/2 CrIII ions. A comprehensive electrochemistry study on 1 and 2 in solution was performed, and biological tests showed that both polyanions display significant antidiabetic and anticancer activities.
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Affiliation(s)
- Wenjing Liu
- Jacobs University , Department of Life Sciences and Chemistry, P.O. Box 750561, 28725 Bremen, Germany
| | - Rami Al-Oweini
- Jacobs University , Department of Life Sciences and Chemistry, P.O. Box 750561, 28725 Bremen, Germany
| | - Karen Meadows
- Jacobs University , Department of Life Sciences and Chemistry, P.O. Box 750561, 28725 Bremen, Germany
| | - Bassem S Bassil
- Jacobs University , Department of Life Sciences and Chemistry, P.O. Box 750561, 28725 Bremen, Germany.,Department of Chemistry, Faculty of Sciences, University of Balamand , P.O. Box 100, Tripoli, Lebanon
| | - Zhengguo Lin
- Jacobs University , Department of Life Sciences and Chemistry, P.O. Box 750561, 28725 Bremen, Germany
| | - Jonathan H Christian
- Department of Chemistry and Biochemistry, Florida State University , 95 Chieftan Way, Tallahassee, Florida 32306, United States
| | - Naresh S Dalal
- Department of Chemistry and Biochemistry, Florida State University , 95 Chieftan Way, Tallahassee, Florida 32306, United States
| | - A Martin Bossoh
- Laboratoire de Chimie-Physique, UMR8000 CNRS, Université Paris-Sud , Orsay F-91405, France.,Université Félix Houphouët-Boigny , 01 BP V34 Abidjan 01, Ivory Coast
| | - Israël M Mbomekallé
- Laboratoire de Chimie-Physique, UMR8000 CNRS, Université Paris-Sud , Orsay F-91405, France
| | - Pedro de Oliveira
- Laboratoire de Chimie-Physique, UMR8000 CNRS, Université Paris-Sud , Orsay F-91405, France
| | - Jamshed Iqbal
- Center for Advanced Drug Research, COMSATS Institute of Information Technology , Abbottabad 22060, Pakistan
| | - Ulrich Kortz
- Jacobs University , Department of Life Sciences and Chemistry, P.O. Box 750561, 28725 Bremen, Germany
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Bassil BS, Xiang Y, Haider A, Hurtado J, Novitchi G, Powell AK, Bossoh AM, Mbomekallé IM, de Oliveira P, Kortz U. Heptanickel(ii) double-cubane core in wells-dawson heteropolytungstate, [Ni7(OH)6(H2O)6(P2W15O56)2](16-). Chem Commun (Camb) 2016; 52:2601-4. [PMID: 26751147 DOI: 10.1039/c5cc09823h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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
The hepta-Ni(2+)-containing 30-tungsto-4-phosphate(v) [Ni7(OH)6(H2O)6(P2W15O56)2](16-) (1) has been synthesized in aqueous, slightly basic medium under conventional reaction conditions, and charactarized via different physical methods. Single-crystal XRD showed that 1 consists of a corner-fused double-cubane {Ni7(OH)6(H2O)6}(8+) fragment sandwiched by two trilacunary [P2W15O56](12-) units. Polyanion 1 is solution-stable as shown by (31)P NMR. Ferromagnetic coupling interaction between the 7 paramagnetic centers of the double-cubane core in 1 with a S = 7 ground state was demonstrated. Electrochemical studies were also performed on 1.
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Affiliation(s)
- Bassem S Bassil
- Jacobs University, Department of Life Sciences and Chemistry, P.O. Box 750 561, 28725 Bremen, Germany.
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Ibrahim M, Haider A, Xiang Y, Bassil BS, Carey AM, Rullik L, Jameson GB, Doungmene F, Mbomekallé IM, Oliveira PD, Mereacre V, Kostakis GE, Powell AK, Kortz U. Tetradecanuclear Iron(III)-Oxo Nanoclusters Stabilized by Trilacunary Heteropolyanions. Inorg Chem 2015; 54:6136-46. [DOI: 10.1021/acs.inorgchem.5b00124] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Masooma Ibrahim
- Department
of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Ali Haider
- Department
of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Yixian Xiang
- Department
of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Bassem S. Bassil
- Department
of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
- Department
of Chemistry, Faculty of Sciences, University of Balamand, P.O. Box 100, Tripoli, Lebanon
| | - Akina M. Carey
- Department
of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Lisa Rullik
- Department
of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
| | - Geoffrey B. Jameson
- Institute
of Fundamental Sciences, Massey University, Tennent Drive, Palmerston North 4442, New Zealand
| | - Floriant Doungmene
- Equipe
d’Electrochimie et de Photoélectrochimie, Laboratoire
de Chimie-Physique, Université Paris-Sud, UMR 8000 CNRS, Orsay F-91405, France
| | - Israël M. Mbomekallé
- Equipe
d’Electrochimie et de Photoélectrochimie, Laboratoire
de Chimie-Physique, Université Paris-Sud, UMR 8000 CNRS, Orsay F-91405, France
| | - Pedro de Oliveira
- Equipe
d’Electrochimie et de Photoélectrochimie, Laboratoire
de Chimie-Physique, Université Paris-Sud, UMR 8000 CNRS, Orsay F-91405, France
| | - Valeriu Mereacre
- Institute
of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131 Karlsruhe, Germany
| | - George E. Kostakis
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, United Kingdom
| | - Annie K. Powell
- Institute
of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131 Karlsruhe, Germany
- Institute
of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz
Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Ulrich Kortz
- Department
of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen, Germany
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Parent L, Aparicio PA, de Oliveira P, Teillout AL, Poblet JM, López X, Mbomekallé IM. Effect of Electron (De)localization and Pairing in the Electrochemistry of Polyoxometalates: Study of Wells–Dawson Molybdotungstophosphate Derivatives. Inorg Chem 2014; 53:5941-9. [DOI: 10.1021/ic500087t] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Loïc Parent
- Université de Versailles St. Quentin, Institut Lavoisier de Versailles,
UMR 8180 CNRS, Versailles, F-78035, France
| | - Pablo A. Aparicio
- Departament de Química
Física i Inorgànica, Universitat Rovira i Virgili, Marcel·li
Domingo s/n, 43007 Tarragona, Spain
| | - Pedro de Oliveira
- Université Paris-Sud, Laboratoire de Chimie-Physique, Equipe d’Electrochimie et
de Photoélectrochimie, UMR 8000 CNRS, Orsay, F-91405, France
| | - Anne-Lucie Teillout
- Université Paris-Sud, Laboratoire de Chimie-Physique, Equipe d’Electrochimie et
de Photoélectrochimie, UMR 8000 CNRS, Orsay, F-91405, France
| | - Josep M. Poblet
- Departament de Química
Física i Inorgànica, Universitat Rovira i Virgili, Marcel·li
Domingo s/n, 43007 Tarragona, Spain
| | - Xavier López
- Departament de Química
Física i Inorgànica, Universitat Rovira i Virgili, Marcel·li
Domingo s/n, 43007 Tarragona, Spain
| | - Israël M. Mbomekallé
- Université de Versailles St. Quentin, Institut Lavoisier de Versailles,
UMR 8180 CNRS, Versailles, F-78035, France
- Université Paris-Sud, Laboratoire de Chimie-Physique, Equipe d’Electrochimie et
de Photoélectrochimie, UMR 8000 CNRS, Orsay, F-91405, France
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Doungmene F, Aparicio PA, Ntienoue J, Mezui CSA, de Oliveira P, López X, Mbomekallé IM. Electrochemical behaviour of mixed d metal-iron containing Wells-Dawson sandwich-type complexes: [(FeOH2)2M2(X2W15O56)2]− and [(MOH2)2Fe2(X2W15O56)2]− (M = CrIII, MnIII, MnII, CoII, NiII, CuII, ZnII, X = AsV or PV and n = 12 or 14). Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.01.151] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Vilà N, Aparicio PA, Sécheresse F, Poblet JM, López X, Mbomekallé IM. Electrochemical behavior of α1/α2-[Fe(H2O)P2W17O61](7-) isomers in solution: experimental and DFT studies. Inorg Chem 2012; 51:6129-38. [PMID: 22582705 DOI: 10.1021/ic300090f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The unusual redox behavior displayed by the two isomers of the Wells-Dawson phosphotungstate anion [Fe(H(2)O)P(2)W(17)O(61)](7-) is presented. The electrochemical measurements have been performed in aqueous media at different pH values from 0.5 up to 8.0. The cyclic voltammetry has also been carried out in organic media to get additional experimental data to establish the effect of the protonation on the redox properties of both isomers. At high pH values (pH ≥ 6) or in an organic medium, the reduction of the Fe center is easier in the case of the alpha-1 isomer, whereas for the alpha-2 isomer such reduction takes place at more negative potentials, as expected. In contrast, at lower pH values (pH ≤ 5), an inversion of this trend is observed, and the reduction of the Fe center becomes easier for the alpha-2 isomer compared to the alpha-1. We were able to highlight the influence of the pH and the pK(a) of the electrolyte on POM-based redox potentials given the pK(a) of the latter. A complementary theoretical study has also been performed to explain the experimental data obtained. In this sense, the results obtained from the DFT study are in good agreement with the experimental data mentioned above and have provided additional information for the electrochemical behavior of both isomers according to their different molecular orbital energies. We have also shown the influence of protonation state of the iron derivative on the relative reduction potentials of both isomers.
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Affiliation(s)
- Neus Vilà
- Université de Versailles St. Quentin, Institut Lavoisier de Versailles, UMR8180 CNRS, Versailles, F-78035, France
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Lebrini M, Mbomekallé IM, Dolbecq A, Marrot J, Berthet P, Ntienoue J, Sécheresse F, Vigneron J, Etcheberry A. Manganese(III)-Containing Wells–Dawson Sandwich-Type Polyoxometalates: Comparison with their Manganese(II) Counterparts. Inorg Chem 2011; 50:6437-48. [DOI: 10.1021/ic102237x] [Citation(s) in RCA: 20] [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: 11/28/2022]
Affiliation(s)
- Mounim Lebrini
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Israël M. Mbomekallé
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Anne Dolbecq
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Jérôme Marrot
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Patrick Berthet
- Laboratoire de Physico-Chimie de l′Etat Solide, ICMMO, UMR 8182, CNRS, Université Paris-Sud, Bâtiment 410, 91405 Orsay Cedex, France
| | - Joseline Ntienoue
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Francis Sécheresse
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Jacky Vigneron
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
| | - Arnaud Etcheberry
- Institut Lavoisier de Versailles, UMR 8180, CNRS Université de Versailles Saint-Quentin, 45 Avenue des Etats-Unis, 78035 Versailles Cedex, France
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