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Trippmacher S, Demeshko S, Prescimone A, Meyer F, Wenger OS, Wang C. Ferromagnetically Coupled Chromium(III) Dimer Shows Luminescence and Sensitizes Photon Upconversion. Chemistry 2024; 30:e202400856. [PMID: 38523568 DOI: 10.1002/chem.202400856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 03/23/2024] [Accepted: 03/25/2024] [Indexed: 03/26/2024]
Abstract
There has been much progress on mononuclear chromium(III) complexes featuring luminescence and photoredox activity, but dinuclear chromium(III) complexes have remained underexplored in these contexts until now. We identified a tridentate chelate ligand able to accommodate both meridional and facial coordination of chromium(III), to either access a mono- or a dinuclear chromium(III) complex depending on reaction conditions. This chelate ligand causes tetragonally distorted primary coordination spheres around chromium(III) in both complexes, entailing comparatively short excited-state lifetimes in the range of 400 to 800 ns in solution at room temperature and making photoluminescence essentially oxygen insensitive. The two chromium(III) ions in the dimer experience ferromagnetic exchange interactions that result in a high spin (S=3) ground state with a coupling constant of +9.3 cm-1. Photoinduced energy transfer from the luminescent ferromagnetically coupled dimer to an anthracene derivative results in sensitized triplet-triplet annihilation upconversion. Based on these proof-of-principle studies, dinuclear chromium(III) complexes seem attractive for the development of fundamentally new types of photophysics and photochemistry enabled by magnetic exchange interactions.
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Affiliation(s)
- Simon Trippmacher
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Serhiy Demeshko
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstraße 4, 37077, Göttingen, Germany
| | - Alessandro Prescimone
- Department of Chemistry, BPR 1096, University of Basel, Mattenstrasse 24a, 4058, Basel, Switzerland
| | - Franc Meyer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstraße 4, 37077, Göttingen, Germany
| | - Oliver S Wenger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Cui Wang
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
- Department of Biology and Chemistry, Osnabrück University, Barbarastraße 7, 49076, Osnabrück, Germany
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2
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Lee KHK, Christou G. Semiempirical Magnetostructural Correlation for High-Nuclearity Mn III-Oxo Complexes: Accommodation of Different Relative Jahn-Teller Axis Orientations. Inorg Chem 2023. [PMID: 37922406 DOI: 10.1021/acs.inorgchem.3c02739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2023]
Abstract
The previous development of a magnetostructural correlation (MSC) for polynuclear FeIII/oxo clusters has now been extended to one for polynuclear MnIII/oxo clusters. A semiempirical model estimating each pairwise Mn2 exchange constant (Jij) from the Mn-O bond lengths and Mn-O-Mn angles has been formulated based on the angular overlap model. The extra complication, compared with the FeIII/oxo MSC, of different relative orientations of the Jahn-Teller distortion axes typical of high-spin MnIII in near-octahedral geometry was accommodated by developing a separate MSC variant for each possible situation. The final coefficients of the three MSC variants were determined by using reliable crystal structure data and experimentally determined Jij values from the literature. The estimated JMSC values from the new MnIII/oxo MSC have been employed to successfully rationalize the magnetic properties of a number of MnIII clusters in the nuclearity range Mn3-Mn10. These properties include relative spin vector alignments in the ground state, the presence of spin frustration effects, and the resulting overall ground state spin. In addition, the JMSC values can be used to simulate the direct-current magnetic susceptibility versus temperature data and provide realistic input values for fits of these data to minimize false-fit problems. A protocol for the use of the new MSC is also reported.
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Affiliation(s)
- Kenneth Hong Kit Lee
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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Krupczak C, Stoeberl BJ, Westrup KC, Tesi L, Santana FS, Giese SO, Yokaichiya F, Costa DDS, Missina JM, Stinghen D, Hughes DL, Sessoli R, Nunes GG, Reis DM, Soares JF. Framework robustness in early d-block metal complexes with tripodal polyalcohol ligands. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Gamage EH, Ribeiro RA, Harmer CP, Canfield PC, Ozarowski A, Kovnir K. Tuning of Cr-Cr Magnetic Exchange through Chalcogenide Linkers in Cr 2 Molecular Dimers. Inorg Chem 2022; 61:6160-6174. [PMID: 35412816 DOI: 10.1021/acs.inorgchem.2c00298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A set of three Cr-dimer compounds, Cr2Q2(en)4X2 (Q: S, Se; X: Br, Cl; en: ethylenediamine), with monoatomic chalcogenide bridges have been synthesized via a single-step solvothermal route. Chalcogenide linkers mediate magnetic exchange between Cr3+ centers, while bidentate ethylenediamine ligands complete the distorted octahedral coordination of Cr centers. Unlike the compounds previously reported, none of the chalcogenide atoms are connected to extra ligands. Magnetic susceptibility studies indicate antiferromagnetic coupling between Cr3+ centers, which are moderate in Cr2Se2(en)4X2 and stronger in Cr2S2(en)4Cl2. Fitting the magnetic data requires a biquadratic exchange term. High-frequency EPR spectra showing characteristic signals due to coupled S = 1 spin states could be interpreted in terms of the "giant spin" Hamiltonian. A fourth compound, Cr2Se8(en)4, has a single diatomic Se bridge connecting the two Cr3+ centers and shows weak ferromagnetic exchange interactions. This work demonstrates the tunability in strength and type of exchange interactions between metal centers by manipulating the interatomic distances and number of bridging chalcogenide linkers.
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Affiliation(s)
- Eranga H Gamage
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
| | - Raquel A Ribeiro
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States.,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Colin P Harmer
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
| | - Paul C Canfield
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States.,Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr, Tallahassee, Florida 32310, United States
| | - Kirill Kovnir
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.,Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
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Börner M, Klose J, Gutierrez Suburu ME, Strassert CA, Yang F, Monakhov KY, Abel B, Kersting B. Synthesis and Characterisation of Luminescent [Cr III 2 L(μ-carboxylato)] 3+ Complexes with High-Spin S=3 Ground States (L=N 6 S 2 donor ligand). Chemistry 2021; 27:14899-14910. [PMID: 34490947 PMCID: PMC8596867 DOI: 10.1002/chem.202102079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Indexed: 01/02/2023]
Abstract
The synthesis, structure, magnetic, and photophysical properties of two dinuclear, luminescent, mixed-ligand [CrIII 2 L(O2 CR)]3+ complexes (R=CH3 (1), Ph (2)) of a 24-membered binucleating hexa-aza-dithiophenolate macrocycle (L)2- are presented. X-ray crystallographic analysis reveals an edge-sharing bioctahedral N3 Cr(μ-SR)2 (μ1,3 -O2 CR)CrN3 core structure with μ1,3 -bridging carboxylate groups. A ferromagnetic superexchange interaction between the electron spins of the Cr3+ ions leads to a high-spin (S=3) ground state. The coupling constants (J=+24.2(1) cm-1 (1), +34.8(4) cm-1 (2), H=-2JS1 S2 ) are significantly larger than in related bis-μ-alkoxido-μ-carboxylato structures. DFT calculations performed on both complexes reproduce both the sign and strength of the exchange interactions found experimentally. Frozen methanol-dichloromethane 1 : 1 solutions of 1 and 2 luminesce at 750 nm when excited into the 4 LMCT state on the 4 A2 → 2 T1 (ν2 ) bands (λexc =405 nm). The absolute quantum yields (ΦL ) for 1 and 2 were found to be strongly temperature dependent. At 77 K in frozen MeOH/CH2 Cl2 glasses, ΦL =0.44±0.02 (for 1), ΦL =0.45±0.02 (for 2).
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Affiliation(s)
- Martin Börner
- Institut für Anorganische ChemieUniversität LeipzigJohannisallee 2904103LeipzigGermany
- Leibniz Institut für OberflächenmodifizierungPermoserstraße 1504318LeipzigGermany
| | - Jennifer Klose
- Institut für Anorganische ChemieUniversität LeipzigJohannisallee 2904103LeipzigGermany
| | - Matias E. Gutierrez Suburu
- Institut für Anorganische und Analytische ChemieCiMICSoNWestfälische Wilhelms-Universität MünsterCorrensstraße 28/3048149MünsterGermany
- CeNTechWestfälische Wilhelms-Universität MünsterHeisenbergstraße 1148149MünsterGermany
| | - Cristian A. Strassert
- Institut für Anorganische und Analytische ChemieCiMICSoNWestfälische Wilhelms-Universität MünsterCorrensstraße 28/3048149MünsterGermany
- CeNTechWestfälische Wilhelms-Universität MünsterHeisenbergstraße 1148149MünsterGermany
| | - Fangshun Yang
- Leibniz Institut für OberflächenmodifizierungPermoserstraße 1504318LeipzigGermany
| | - Kirill Yu. Monakhov
- Leibniz Institut für OberflächenmodifizierungPermoserstraße 1504318LeipzigGermany
| | - Bernd Abel
- Leibniz Institut für OberflächenmodifizierungPermoserstraße 1504318LeipzigGermany
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische ChemieUniversität LeipzigLinnéstrasse 204103LeipzigGermany
| | - Berthold Kersting
- Institut für Anorganische ChemieUniversität LeipzigJohannisallee 2904103LeipzigGermany
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Wang HS, Zhang K, Song Y, Pan ZQ. Recent advances in 3d-4f magnetic complexes with several types of non-carboxylate organic ligands. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120318] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Georgiev M, Chamati H. Molecular magnetism in the multi-configurational self-consistent field method. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:075803. [PMID: 33152727 DOI: 10.1088/1361-648x/abc802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We develop a structured theoretical framework used in our recent articles (2019 Eur. Phys. J. B 92 93 and 2020 Phys. Rev. B 101 094427) to characterize the unusual behavior of the magnetic spectrum, magnetization and magnetic susceptibility of the molecular magnet Ni4Mo12. The theoretical background is based on the molecular orbital theory in conjunction with the multi-configurational self-consistent field method and results in a post-Hartree-Fock scheme for constructing the corresponding energy spectrum. Furthermore, we construct a bilinear spin-like Hamiltonian involving discrete coupling parameters accounting for the relevant spectroscopic magnetic excitations, magnetization and magnetic susceptibility. The explicit expressions of the eigenenergies of the ensuing Hamiltonian are determined and the physical origin of broadening and splitting of experimentally observed peaks in the magnetic spectra is discussed. To demonstrate the efficiency of our method we compute the spectral properties of a spin-one magnetic dimer. The present approach may be applied to a variety of magnetic units based on transition metals and rare Earth elements.
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Affiliation(s)
- M Georgiev
- Institute of Solid State Physics, Bulgarian Academy of Sciences, Tsarigradsko Chaussée 72, 1784 Sofia, Bulgaria
| | - H Chamati
- Institute of Solid State Physics, Bulgarian Academy of Sciences, Tsarigradsko Chaussée 72, 1784 Sofia, Bulgaria
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Shukla P, Roy S, Dolui D, Cañón-Mancisidor W, Das S. Pentanuclear Spirocyclic Ni4
Ln Derivatives: Field Induced Slow Magnetic Relaxation in the Dysprosium and Erbium Analogues. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.201901350] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Pooja Shukla
- Department of Chemistry; Institute of Infrastructure Technology Research And Management; Near Khokhra Circle, Maninagar East 380026 Ahmedabad Gujarat India
| | - Soumalya Roy
- Department of Chemistry; Institute of Infrastructure Technology Research And Management; Near Khokhra Circle, Maninagar East 380026 Ahmedabad Gujarat India
| | - Dependu Dolui
- Discipline of Chemistry; Indian Institute of Technology; 382355 Gandhinagar Gujarat India
| | - Walter Cañón-Mancisidor
- Facultad de Químicas y Biología; Departamento de Química de Materiales; Universidad de Santiago de Chile (USACH); Santiago Chile
- Departamento de Química de Materiales; Center for the Development of Nanoscience and Nanotechnology (CEDENNA); Santiago Chile
| | - Sourav Das
- Department of Chemistry; Institute of Infrastructure Technology Research And Management; Near Khokhra Circle, Maninagar East 380026 Ahmedabad Gujarat India
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Fraser HWL, Smythe L, Dey S, Nichol GS, Piligkos S, Rajaraman G, Brechin EK. A simple methodology for constructing ferromagnetically coupled Cr(iii) compounds. Dalton Trans 2018; 47:8100-8109. [PMID: 29877529 DOI: 10.1039/c8dt01963k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A large family of chromium(iii) dimers has been synthesised and magneto-structurally characterised using a combination of carboxylate and diethanolamine type ligands. The compounds have the general formula [Cr2(R1-deaH)2(O2CR2)Cl2]Cl where R1 = Me and R2 = H (1), Me (2), CMe3 (3), Ph (4), 3,5-(Cl)2Ph (5), (Me)5Ph (6), R1 = Et and R2 = H (7), Ph (8). The compound [Cr2(Me-deaH)2Cl4] (9) was synthesised in order to study the effect of removing/adding the carboxylate bridge on the observed magnetic behaviour. Direct current (DC) magnetic susceptibility measurements showed ferromagnetic (FM) exchange interactions between the Cr(iii) centres in the carboxylate bridged family with coupling constants in the range +0.37 < J < +8.02 cm-1. Removal of the carboxylate to produce the dialkoxide-bridged compound 9 resulted in antiferromagnetic (AFM) exchange between the Cr(iii) ions. DFT calculations reveal the ferromagnetic exchange is the result of an orbital counter-complementarity effect occuring upon introduction of the bridging carboxylate.
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Affiliation(s)
- Hector W L Fraser
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ Scotland, UK.
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