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Breibeck J, Gumerova NI, Rompel A. Oxo-Replaced Polyoxometalates: There Is More than Oxygen. ACS Org Inorg Au 2022; 2:477-495. [PMID: 36510613 PMCID: PMC9732882 DOI: 10.1021/acsorginorgau.2c00014] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 08/10/2022] [Accepted: 08/10/2022] [Indexed: 02/02/2023]
Abstract
The presence of oxo-ligands is one of the main required characteristics for polyoxometalates (POMs), although some oxygen ions in a metallic environment can be replaced by other nonmetals, while maintaining the POM structure. The replacement of oxo-ligands offers a valuable approach to tune the charge distribution and connected properties like reducibility and hydrolytic stability of POMs for the development of tailored compounds. By assessing the reported catalytic and biological applications and connecting them to POM structures, the present review provides a guideline for synthetic approaches and aims to stimulate further applications where the oxo-replaced compounds are superior to their oxo-analogues. Oxo-replacement in POMs deserves more attention as a valuable tool to form chemically activated precursors for the synthesis of novel structures or to upgrade established structures with extraordinary properties for challenging applications.
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Cherevan AS, Nandan SP, Roger I, Liu R, Streb C, Eder D. Polyoxometalates on Functional Substrates: Concepts, Synergies, and Future Perspectives. Adv Sci (Weinh) 2020; 7:1903511. [PMID: 32328431 PMCID: PMC7175252 DOI: 10.1002/advs.201903511] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/28/2020] [Indexed: 05/25/2023]
Abstract
Polyoxometalates (POMs) are molecular metal oxide clusters that feature a broad range of structures and functionalities, making them one of the most versatile classes of inorganic molecular materials. They have attracted widespread attention in homogeneous catalysis. Due to the challenges associated with their aggregation, precipitation, and degradation under operational conditions and to extend their scope of applications, various strategies of depositing POMs on heterogeneous substrates have been developed. Recent ground-breaking developments in the materials chemistry of supported POM composites are summarized and links between molecular-level understanding of POM-support interactions and macroscopic effects including new or optimized reactivities, improved stability, and novel function are established. Current limitations and future challenges in studying these complex composite materials are highlighted, and cutting-edge experimental and theoretical methods that will lead to an improved understanding of synergisms between POM and support material from the molecular through to the nano- and micrometer level are discussed. Future development in this fast-moving field is explored and emerging fields of research in POM heterogenization are identified.
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Affiliation(s)
- Alexey S. Cherevan
- Institute of Materials ChemistryVienna University of TechnologyGetreidemarkt 9/BC/02Vienna1060Austria
| | - Sreejith P. Nandan
- Institute of Materials ChemistryVienna University of TechnologyGetreidemarkt 9/BC/02Vienna1060Austria
| | - Isolda Roger
- Institute of Inorganic Chemistry IUlm UniversityAlbert‐Einstein‐Allee 11Ulm89081Germany
| | - Rongji Liu
- Institute of Inorganic Chemistry IUlm UniversityAlbert‐Einstein‐Allee 11Ulm89081Germany
- CAS Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China
| | - Carsten Streb
- Institute of Inorganic Chemistry IUlm UniversityAlbert‐Einstein‐Allee 11Ulm89081Germany
- Helmholtz‐Institute UlmHelmholtzstr. 11Ulm89081Germany
| | - Dominik Eder
- Institute of Materials ChemistryVienna University of TechnologyGetreidemarkt 9/BC/02Vienna1060Austria
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Dearle AE, Cutler DJ, Fraser HWL, Sanz S, Lee E, Dey S, Diaz-Ortega IF, Nichol GS, Nojiri H, Evangelisti M, Rajaraman G, Schnack J, Cronin L, Brechin EK. An [Fe III 34 ] Molecular Metal Oxide. Angew Chem Int Ed Engl 2019; 58:16903-16906. [PMID: 31535459 PMCID: PMC7186828 DOI: 10.1002/anie.201911003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [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: 08/29/2019] [Indexed: 11/11/2022]
Abstract
The dissolution of anhydrous iron bromide in a mixture of pyridine and acetonitrile, in the presence of an organic amine, results in the formation of an [Fe34] metal oxide molecule, structurally characterised by alternate layers of tetrahedral and octahedral FeIII ions connected by oxide and hydroxide ions. The outer shell of the complex is capped by a combination of pyridine molecules and bromide ions. Magnetic data, measured at temperatures as low as 0.4 K and fields up to 35 T, reveal competing antiferromagnetic exchange interactions; DFT calculations showing that the magnitudes of the coupling constants are highly dependent on both the Fe‐O‐Fe angles and Fe−O distances. The simplicity of the synthetic methodology, and the structural similarity between [Fe34], bulk iron oxides, previous FeIII–oxo cages, and polyoxometalates (POMs), hints that much larger molecular FeIII oxides can be made.
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Affiliation(s)
- Alice E Dearle
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Daniel J Cutler
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Hector W L Fraser
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Sergio Sanz
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Edward Lee
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK.,WestCHEM School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | | | - Gary S Nichol
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
| | - Hiroyuki Nojiri
- IMR, Tohoku Univ, Katahira 2-1-1, Aobaku, Sendai, 980-8577, Japan
| | - Marco Evangelisti
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Jürgen Schnack
- Fakultät für Physik, Universitat Bielefeld, Postfach 100131, 33501, Bielefeld, Germany
| | - Leroy Cronin
- WestCHEM School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH93FJ, UK
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