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Gamage EH, Clark JK, Yazback M, Cheng HP, Shatruk M, Kovnir K. Solvothermal Synthesis of [Cr 7 S 8 (en) 8 Cl 2 ]Cl 3 ⋅ 2H 2 O with Magnetically Frustrated [Cr 7 S 8 ] 5+ Double-Cubes*. Chemistry 2021; 28:e202103761. [PMID: 34757673 PMCID: PMC9300142 DOI: 10.1002/chem.202103761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Indexed: 11/08/2022]
Abstract
A novel transition metal chalcohalide [Cr7S8(en)8Cl2]Cl3 ⋅ 2H2O, with [Cr7S8]5+ dicubane cationic clusters, has been synthesized by a low temperature solvothermal method, using dimethyl sulfoxide (DMSO) and ethylenediamine (en) solvents. Ethylenediamine ligand exhibits bi‐ and monodentate coordination modes; in the latter case ethylenediamine coordinates to Cr atoms of adjacent clusters, giving rise to a 2D polymeric structure. Although magnetic susceptibility shows no magnetic ordering down to 1.8 K, a highly negative Weiss constant, θ=−224(2) K, obtained from Curie‐Weiss fit of inverse susceptibility, suggests strong antiferromagnetic (AFM) interactions between S=3/2 Cr(III) centers. Due to the complexity of the system with (2S+1)7=16384 microstates from seven Cr3+ centers, a simplified model with only two exchange constants was used for simulations. Density‐functional theory (DFT) calculations yielded the two exchange constants to be J1=−21.4 cm−1 and J2=−30.2 cm−1, confirming competing AFM coupling between the shared Cr3+ center and the peripheral Cr3+ ions of the dicubane cluster. The best simulation of the experimental data was obtained with J1=−20.0 cm−1 and J2=−21.0 cm−1, in agreement with the slightly stronger AFM exchange within the triangles of the peripheral Cr3+ ions as compared to the AFM exchange between the central and peripheral Cr3+ ions. This compound is proposed as a synthon towards magnetically frustrated systems assembled by linking dicubane transition metal‐chalcogenide clusters into polymeric networks.
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Affiliation(s)
- Eranga H Gamage
- Department of Chemistry, Iowa State University, Ames, Iowa, 50011, USA.,Ames Laboratory, U.S. Department of Energy, Ames, Iowa, 50011, USA
| | - Judith K Clark
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida, 32306, USA
| | - Maher Yazback
- Department of Physics, Center for Molecular Magnetic Quantum Materials, and Quantum Theory Project, University of Florida, Gainesville, Florida, 32611, USA
| | - Hai-Ping Cheng
- Department of Physics, Center for Molecular Magnetic Quantum Materials, and Quantum Theory Project, University of Florida, Gainesville, Florida, 32611, USA
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida, 32306, USA.,National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA
| | - Kirill Kovnir
- Department of Chemistry, Iowa State University, Ames, Iowa, 50011, USA.,Ames Laboratory, U.S. Department of Energy, Ames, Iowa, 50011, USA
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Lupan A, Silaghi-Dumitrescu R, King RB. Tetracapped tetrahedral ruthenium-sulfur clusters related to iron-sulfur structural units in metalloenzymes. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.10.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Probing the structural, electronic and magnetic properties of multicenter Fe2S2 0/−, Fe3S4 0/− and Fe4S4 0/− clusters. J Mol Model 2012; 19:1527-36. [DOI: 10.1007/s00894-012-1714-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 11/27/2012] [Indexed: 10/27/2022]
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Ruiz E. Theoretical Study of the Exchange Coupling in Large Polynuclear Transition Metal Complexes Using DFT Methods. STRUCTURE AND BONDING 2012. [DOI: 10.1007/b97942] [Citation(s) in RCA: 159] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Jensen KP. Computational studies of modified [Fe3S4] clusters: Why iron is optimal. J Inorg Biochem 2008; 102:87-100. [PMID: 17723245 DOI: 10.1016/j.jinorgbio.2007.07.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2007] [Revised: 07/08/2007] [Accepted: 07/17/2007] [Indexed: 10/23/2022]
Abstract
This work reports density functional computations of metal-substituted models of biological [Fe3S4] clusters in oxidation states [MFe2S4](+/0/-1) (M=Mn, Fe, Co, Ni, Cu, Zn, and Mo). Geometry optimization with a dielectric screening model is shown to provide a substantial improvement in structure, compared to earlier used standard procedures. The error for average Fe-S bonds decreased from 0.038A to 0.016A with this procedure. Four density functionals were compared, B3LYP, BP86, TPSS, and TPSSh. B3LYP and to a lesser extent TPSSh energies were inconsistent with experiment for the oxidized [Fe3S4]+ cluster. BP86 (and to a slightly lesser extent TPSS) was within expected theoretical and experimental uncertainties for all oxidation states, the only qualitative error being 5kJ/mol in favor of the M(S)=3/2 configuration for the [Fe3S4]+ cluster, so BP86 was used for quantitative results. Computed reorganization energies and reduction potentials point directly towards the [Fe3S4] cluster as the superior choice of electron carrier, with the [ZnFe2S4] cluster a close second. In addition, partially and fully Mo-substituted clusters were investigated and found to have very low reorganization energies but too negative reduction potentials. The results provide a direct rationale why any substitution weakens the cluster as an electron carrier, and thus why the [Fe3S4] composition is optimal in the biological clusters.
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Affiliation(s)
- Kasper P Jensen
- Technical University of Denmark, Department of Chemistry, Building 207, 2800 Kgs. Lyngby, DK, Denmark.
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McGrady JE, Gracia J. Catalytic hydrogenolysis of alkyl halides by sulfido-bridged molybdenum clusters: A density functional study. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.04.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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