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Tandon S, Steuber FW, Kathalikkattil AC, Venkatesan M, Watson GW, Schmitt W. Modulating Structural and Electronic Properties of Rare Archimedean and Johnson-Type Mn Cages. Inorg Chem 2021; 60:8388-8393. [PMID: 34076418 DOI: 10.1021/acs.inorgchem.1c00984] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-nuclearity Mn complexes have attracted significant scientific attention due to their fascinating magnetic properties and their relevance to bioinorganic systems and catalysis. In this work, we demonstrate how the strong binding characteristics of phosphonate ligands can be coupled with sterically hindered carboxylate groups to influence the symmetry of Mn coordination clusters. We describe the structure of two high-nuclearity Mn coordination cages, {Mn12} and {Mn15}, synthesized using this approach. These cages are structurally related to the truncated tetrahedral geometry and adopt rare topological features of Archimedean and Johnson-type solids. Their structural attributes distinctively influence their magnetic properties and electrocatalytic H2O oxidation characteristics.
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Affiliation(s)
- Swetanshu Tandon
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Friedrich W Steuber
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Amal C Kathalikkattil
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Munuswamy Venkatesan
- School of Physics & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Graeme W Watson
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Wolfgang Schmitt
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.,AMBER Center, University of Dublin, Trinity College, Dublin 2, Ireland
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Tandon S, Venkatesan M, Schmitt W, Watson GW. Altering the nature of coupling by changing the oxidation state in a {Mn 6} cage. Dalton Trans 2020; 49:8086-8095. [PMID: 32458901 DOI: 10.1039/d0dt01404d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polynuclear transition metal complexes have continuously attracted interest owing to their peculiar electronic and magnetic properties which are influenced by the symmetry and connectivity of the metal centres. Understanding the full electronic picture in such cases often becomes difficult owing to the presence of multiple bridges between metal centres. We have investigated the electronic structure of a {Mn6} cage complex using computational and experimental approaches with the aim to understand the coupling between the manganese centres. The nature of the various coupling pathways has been determined using a novel methodology that involves perturbing the system while retaining the symmetry and analysing the effect on the coupling strength due to the perturbation. Furthermore, we have investigated the magnetic properties of this complex in higher oxidation states which reveals a switch in the nature of coupling from antiferromagnetic to ferromagnetic in addition to stabilisation of intermediate spin states.
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Affiliation(s)
- Swetanshu Tandon
- School of Chemistry & CRANN Institute, University of Dublin, Trinity College, Dublin 2, Ireland.
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Chevallot-Beroux E, Ako AM, Schmitt W, Twamley B, Moran J, Corinne B, Ruhlmann L, Mameri S. Synthesis of new Mn 19 analogues and their structural, electrochemical and catalytic properties. Dalton Trans 2019; 48:4830-4836. [PMID: 30778455 DOI: 10.1039/c8dt04807j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis and structural characterisation of new Mn19 and Mn18M analogues, [MnIII12MnII7(μ4-O)8(μ3-OCH3)2(μ3-Br)6(HLMe)12(MeOH)6]Br2 (2) and [MnIII12MnII6Sr(μ4-O8(μ3-Cl)8(HLMe)12(MeCN)6]Cl2 cluster (3), where H3LMe is 2,6-bis(hydroxymethyl)-p-cresol. The electrochemistry of 2 and 3 has been investigated and their activity as catalysts in the oxidation of benzyl alcohol has been evaluated. Selective oxidation of benzyl alcohol to benzaldehyde by O2 was achieved using 1 mol% of catalyst with conversions of 74% (2) and 60% (3) at 140 °C using TEMPO as a co-catalyst. No partial conversion of benzaldehyde to benzoic acid was observed. The results obtained revealed that different operative parameters - such as catalyst loading, temperature, time, solvent and the presence of molecular oxygen - played an important role in the selective oxidation of benzyl alcohol.
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Affiliation(s)
- Elodie Chevallot-Beroux
- Laboratory of Chemical Catalysis, University of Strasbourg, ISIS UMR 7006, 8 allée Gaspard Monge, Strasbourg 67083, France
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Multicomponent halide templating: The effect of structure-directing agents on the assembly of molecular and extended coordination compounds. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.05.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Bai J, Yang C, Li G, Bi Y, Li X, Tang J, Han T, Zheng YZ, Wu G, Qiu S. “Merged-chelating” approach for constructing high-spin Mn aggregate: A [MnIII2] dimer and a 2-D honeycomb network based on star-shaped [MnIIMnIII3] tetramer. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.03.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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