1
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Zabala-Lekuona A, Lopez de Pariza X, Díaz-Ortega IF, Cepeda J, Nojiri H, Gritsan NP, Dmitriev AA, López-Ortega A, Rodríguez-Diéguez A, Seco JM, Colacio E. From field-induced to zero-field SMMs associated with open/closed structures of bis(ZnDy) tetranuclear complexes: a combined magnetic, theoretical and optical study. Dalton Trans 2024; 53:7971-7984. [PMID: 38647324 DOI: 10.1039/d4dt00148f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
We have prepared a bis(compartmental) Mannich base ligand H4L (1,4,8,11-tetraaza-1,4,8,11-tetrakis(2-hydroxy-3-methoxy-5-methylbenzyl)cyclotetradecane) specifically designed to obtain bis(TMIILnIII) tetranuclear complexes (TM = transition metal). In this regard, we have succeeded in obtaining three new complexes of the formula [Zn2(μ-L)(μ-OAc)Dy2(NO3)2]·[Zn2(μ-L)(μ-OAc)Dy2(NO3)(OAc)]·4CHCl3·2MeOH (1) and [TM2(μ-H2L)2(μ-succinate)Ln2(NO3)2] (NO3)2·2H2O·6MeOH (TMII = Zn, LnIII = Dy (2); TMII = Co, LnIII = Dy (3)). Compound 1 contains two different bis(ZnDy) tetranuclear molecules that cocrystallize in the structure, in which acetato bridging ligands connect the ZnII and DyIII ions within each ZnDy subunit. This compound does not exhibit slow magnetic relaxation at zero field, but it is activated in the presence of an applied dc magnetic field and/or by Dy/Y magnetic dilution, showing two relaxation processes corresponding to each of the two different bis(ZnDy) units found in the structure. As revealed by the theoretical calculations, magnetic relaxation in 1 is single-ion in origin and takes place through the first excited state of each DyIII ion. When using the succinato dicarboxylate bridging ligand instead of acetate, compounds 2 and 3 were serendipitously formed, which have a closed structure with the succinate anion bridging two ZnDy subunits belonging to two different ligands. It should be noted that only compound 2 exhibits slow relaxation of magnetization in the absence of an external magnetic field. According to experimental and theoretical data, 2 relaxes through the second excited Kramers doublet (Ueff = 342 K). In contrast, 3 displays field-induced SMM behaviour (Ueff = 203 K). However, the Co/Zn diluted version of this compound 3Zn shows slow relaxation at zero field (Ueff = 347 K). Ab initio theoretical calculations clearly show that the weak ferromagnetic coupling between CoII and DyIII ions is at the origin of the lack of slow relaxation of this compound at zero field. Compound 2 and its diluted analogues 2Y and 3Zn show hysteresis loops at very low temperature, thus confirming their SMM behaviour. Finally, compounds 1 and 2 show DyIII based emission even at room temperature that, in the case of 2, allows us to extract the splitting of the ground 6H15/2 term, which matches reasonably well with theoretical calculations.
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Affiliation(s)
- Andoni Zabala-Lekuona
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco (UPV/EHU), 20018 Donostia-San Sebastián, Spain.
| | - Xabier Lopez de Pariza
- POLYMAT and Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, Donostia-San Sebastián 20018, Spain
| | - Ismael F Díaz-Ortega
- Departamento de Química y Física-CIESOL, Universidad de Almería, Ctra. Sacramento s/n, 04120 Almería, Spain
- Institute for Materials Research, Tohoku University, Katahira, Sendai, 980-8577, Japan
| | - Javier Cepeda
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco (UPV/EHU), 20018 Donostia-San Sebastián, Spain.
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Katahira, Sendai, 980-8577, Japan
| | - Nina P Gritsan
- Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Alexey A Dmitriev
- Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Alberto López-Ortega
- Departamento de Ciencias, Universidad Pública de Navarra, E-31006 Pamplona, Spain
- Institute for Advanced Materials and Mathematics (INAMAT2), Universidad Pública de Navarra, E-31006 Pamplona, Spain
- CIC nanoGUNE BRTA, Tolosa Hiribidea 76, Donostia-San Sebastian, 20018, Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain.
| | - José M Seco
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco (UPV/EHU), 20018 Donostia-San Sebastián, Spain.
| | - Enrique Colacio
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain.
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2
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Synthesis, Crystal Structures and Magnetic Properties of Trinuclear {Ni2Ln} (LnIII = Dy, Ho) and {Ni2Y} Complexes with Schiff Base Ligands. CRYSTALS 2022. [DOI: 10.3390/cryst12010095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The reaction of the Schiff base ligand o-OH-C6H4-CH=N-C(CH2OH)3, H4L, with Ni(O2CMe)2∙4H2O and lanthanide nitrate salts in a 4:2:1 ratio lead to the formation of the trinuclear complexes [Ni2Ln(H3L)4(O2CMe)2](NO3) (Ln = Dy (1), Ho (2), and Y (3)) which crystallize in the non-centrosymmetric space group Pna21. The complex cation consists of the three metal ions in an almost linear arrangement. The {Ni2Ln} moieties are bridged through two deprotonated Ophenolato groups from two different ligands. Each terminal NiII ion is bound to two ligands through their Ophenolato, the Nimino atoms and one of the protonated Oalkoxo groups in a distorted octahedral. The central lanthanide ion is coordinated to four Ophenolato oxygen from the four ligands, and four Ocarboxylato atoms from two acetates which are bound in the bidentate chelate mode, and the coordination polyhedron is biaugmented trigonal prism, which probably results in a non-centrosymmetric arrangement of the complexes in the lattice. The magnetic properties of 1–3 were studied and showed that 1 exhibits field induced slow magnetic relaxation.
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3
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Comba P, Enders M, Großhauser M, Hiller M, Klingeler R, Koo C, Müller D, Rajaraman G, Swain A, Tavhelidse M, Wadepohl H. Validation of Ab-Initio-Predicted Magnetic Anisotropies and Magneto-structural Correlations in Linear Hetero-trinuclear Dy III -Ni II 2 Compounds. Chemistry 2021; 27:9372-9382. [PMID: 33884678 PMCID: PMC8359843 DOI: 10.1002/chem.202100626] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Indexed: 11/20/2022]
Abstract
Reported are single crystal SQUID and single crystal high-frequency/high-field EPR data of a trinuclear complex with a rare six-coordinate coordination sphere of a DyIII center coupled to two terminal six-coordinate NiII ions. The analysis of the single crystal spectroscopic parameters allows for an accurate description of the ground state wavefunction. The experimental analysis is supplemented by the analysis of the paramagnetic NMR spectra, allowing for a thorough description of the DyIII center. The experimental data are interpreted on the basis of an ab initio ligand field analysis, and the computed parameters are in good agreement with the experimental observations. This supports the quality of the theoretical approach based on a pseudo-spin Hamiltonian for the electronic ground state. Further support emerges from the ab initio ligand field theory based analysis of a structurally very similar system that, in contrast to the complex reported here, shows single molecule magnetic properties, and this is in agreement with the quantum-chemical prediction and analysis.
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Affiliation(s)
- Peter Comba
- Universität Heidelberg Anorganisch-Chemisches Institut INF 27069120HeidelbergGermany
- Interdisziplinäres Zentrum für Wissenschaftliches RechnenIWRUniversität Heidelberg INF 27069120HeidelbergGermany
| | - Markus Enders
- Universität Heidelberg Anorganisch-Chemisches Institut INF 27069120HeidelbergGermany
| | - Michael Großhauser
- Universität Heidelberg Anorganisch-Chemisches Institut INF 27069120HeidelbergGermany
| | - Markus Hiller
- Universität Heidelberg Anorganisch-Chemisches Institut INF 27069120HeidelbergGermany
| | - Rüdiger Klingeler
- Kirchhoff-Institut für PhysikUniversität Heidelberg, INF 22769120HeidelbergGermany
- Centre for Advanced Materials (CAM), INF 22569120HeidelbergGermany
| | - Changhyun Koo
- Kirchhoff-Institut für PhysikUniversität Heidelberg, INF 22769120HeidelbergGermany
| | - Dennis Müller
- Universität Heidelberg Anorganisch-Chemisches Institut INF 27069120HeidelbergGermany
- Interdisziplinäres Zentrum für Wissenschaftliches RechnenIWRUniversität Heidelberg INF 27069120HeidelbergGermany
| | - Gopalan Rajaraman
- Department of ChemistryIndian Institute of Technology Bombay PowaiMumbai400076India
| | - Abinash Swain
- Department of ChemistryIndian Institute of Technology Bombay PowaiMumbai400076India
| | - Msia Tavhelidse
- Kirchhoff-Institut für PhysikUniversität Heidelberg, INF 22769120HeidelbergGermany
| | - Hubert Wadepohl
- Universität Heidelberg Anorganisch-Chemisches Institut INF 27069120HeidelbergGermany
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4
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Pankratova YA, Nelyubina YV, Novikov VV, Pavlov AA. High-Spin Cobalt(II) Complex with Record-Breaking Anisotropy of the Magnetic Susceptibility According to Paramagnetic NMR Spectroscopy Data. RUSS J COORD CHEM+ 2021. [DOI: 10.1134/s1070328420120052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract
The tetrahedral cobalt(II) complex [CoL2](HNEt3)2 (I), where L is 1,2-bis(methanesulfonamido)benzene, exhibiting the properties of a single-molecule magnet is synthesized and characterized. The electronic structure parameters of complex I are determined by paramagnetic NMR spectroscopy. They completely reproduce the results of less available methods of studying single-molecule magnets. The value of axial anisotropy of the magnetic susceptibility estimated for complex I (Δχax = 34.5 × 10–32 m3 at 20°C) is record-breaking among all transition metal complexes studied by the NMR method, which provides wide possibilities for the use of complex I as a paramagnetic label for structural biology or as a contrast agent and even a temperature sensor for medical diagnostics. The data obtained indicate the advantages of paramagnetic NMR spectroscopy as a method of investigation of the magnetic properties and electronic structures of highly anisotropic transition metal complexes, which are precursors of many functional materials.
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5
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Heterometallic Complexes Containing the NiII-LnIII-NiII Moiety—Structures and Magnetic Properties. CRYSTALS 2020. [DOI: 10.3390/cryst10121117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This review summarizes the structural characteristics and magnetic properties of trinuclear complexes containing the NiII-LnIII-NiII moiety and also oligonuclear complexes and coordination polymers containing the same trinuclear moiety. The ligands used are mainly polydentate Schiff base ligands and reduced Schiff base ligands and, in some cases, oximato, β-diketonato, pyridyl ketone ligands and others. The compounds reported are restricted to those containing one, two and three oxygen atoms as bridges between the metal ions; examples of carboxylato and oximato bridging are also included due to structural similarity. The magnetic properties of the complexes range from ferro- to antiferromagnetic depending on the nature of the lanthanide ion.
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6
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Pavlov AA, Nehrkorn J, Zubkevich SV, Fedin MV, Holldack K, Schnegg A, Novikov VV. A Synergy and Struggle of EPR, Magnetometry and NMR: A Case Study of Magnetic Interaction Parameters in a Six-Coordinate Cobalt(II) Complex. Inorg Chem 2020; 59:10746-10755. [DOI: 10.1021/acs.inorgchem.0c01191] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Alexander A. Pavlov
- A.N.Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, Moscow 119991, Russia
- Moscow Institute of Physics and Technology,
Institutskiy per. 9, Dolgoprudny, Moscow 141701, Russia
| | - Joscha Nehrkorn
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34−36, 45470 Mülheim an der Ruhr, Germany
| | | | - Matvey V. Fedin
- International Tomography Center, SB RAS, Institutskaya
3A, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Karsten Holldack
- Helmholtz-Zentrum für Materialien und Energie GmbH (HZB), Albert-Einstein-Straße 15, D-12489 Berlin, Germany
| | - Alexander Schnegg
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34−36, 45470 Mülheim an der Ruhr, Germany
| | - Valentin V. Novikov
- A.N.Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, Moscow 119991, Russia
- Moscow Institute of Physics and Technology,
Institutskiy per. 9, Dolgoprudny, Moscow 141701, Russia
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7
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Georgopoulou AN, Pissas M, Psycharis V, Sanakis Y, Raptopoulou CP. Trinuclear Ni II-Ln III-Ni II Complexes with Schiff Base Ligands: Synthesis, Structure, and Magnetic Properties. Molecules 2020; 25:E2280. [PMID: 32408647 PMCID: PMC7288099 DOI: 10.3390/molecules25102280] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 04/30/2020] [Accepted: 05/06/2020] [Indexed: 11/29/2022] Open
Abstract
The reaction of the Schiff base ligand o-OH-C6H4-CH=N-C(CH2OH)3, H4L, with Ni(O2CMe)2∙4H2O and lanthanide nitrate salts in a 4 : 2 : 1 ratio lead to the formation of the trinuclear complexes [Ni2Ln(H3L)4(O2CMe)2](NO3) (Ln = Sm (1), Eu (2), Gd (3), Tb (4)). The complex cations contain the strictly linear NiII-LnIII-NiII moiety. The central LnIII ion is bridged to each of the terminal NiII ions through two deprotonated phenolato groups from two different ligands. Each terminal NiII ion is bound to two ligands in distorted octahedral N2O4 environment. The central lanthanide ion is coordinated to four phenolato oxygen atoms from the four ligands, and four carboxylato oxygen atoms from two acetates which are bound in the bidentate chelate mode. The lattice structure of complex 4 consists of two interpenetrating, supramolecular diamond like lattices formed through hydrogen bonds among neighboring trinuclear clusters. The magnetic properties of 1-4 were studied. For 3 the best fit of the magnetic susceptibility and isothermal M(H) data gave JNiGd = +0.42 cm-1, D = +2.95 cm-1 with gNi = gGd = 1.98. The ferromagnetic nature of the intramolecular Ni···Gd interaction revealed ground state of total spin S = 11/2. The magnetocaloric effect (MCE) parameters for 3 show that the change of the magnetic entropy (-ΔSm) reaches a maximum of 14.2 J kg-1 K-1 at 2 K. A brief literature survey of complexes containing the NiII-LnIII-NiII moiety is discussed in terms of their structural properties.
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Affiliation(s)
| | | | | | | | - Catherine P. Raptopoulou
- Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi, 15310 Athens, Greece; (A.N.G.); (M.P.); (V.P.); (Y.S.)
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8
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Liu X, Du L, Wang Y, Li R, Feng X, Ding Y. Synthesis, crystal structures and properties of two nickel (II) complexes with different nitrogen-heterocyclic polycarboxylate ligand. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Ramirez BL, Sharma P, Eisenhart RJ, Gagliardi L, Lu CC. Bimetallic nickel-lutetium complexes: tuning the properties and catalytic hydrogenation activity of the Ni site by varying the Lu coordination environment. Chem Sci 2019; 10:3375-3384. [PMID: 30996926 PMCID: PMC6429466 DOI: 10.1039/c8sc04712j] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 02/03/2019] [Indexed: 12/31/2022] Open
Abstract
We present three heterobimetallic complexes containing an isostructural nickel center and a lutetium ion in varying coordination environments. The bidentate iPr2PCH2NHPh and nonadentate (iPr2PCH2NHAr)3tacn ligands were used to prepare the Lu metalloligands, Lu(iPr2PCH2NPh)3 (1) and Lu{(iPr2PCH2NAr)3tacn} (2), respectively. Reaction of Ni(COD)2 (where COD is 1,5-cyclooctadiene) and 1 afforded NiLu(iPr2PCH2NPh)3 (3), with a Lu coordination number (CN) of 4 and a Ni-Lu distance, d(Ni-Lu), of 2.4644(2) Å. Complex 3 can further bind THF to form 3-THF, increasing both the Lu CN to 5 and d(Ni-Lu) to 2.5989(4) Å. On the other hand, incorporation of Ni(0) into 2 provides NiLu{(iPr2PCH2NAr)3tacn} (4), in which the Lu coordination environment is more saturated (CN = 6), and the d(Ni-Lu) is substantially elongated at 2.9771(5) Å. Cyclic voltammetry of the three Ni-Lu complexes shows an overall ∼410 mV shift in the Ni(0/I) redox couple, suggesting tunability of the Ni electronics across the series. Computational studies reveal polarized bonding interactions between the Ni 3d z 2 (major) and the Lu 5d z 2 (minor) orbitals, where the percentage of Lu character increases in the order: 4 (6.0% Lu 5d z 2 ) < 3-THF (8.5%) < 3 (9.3%). All three Ni-Lu complexes bind H2 at low temperatures (-30 to -80 °C) and are competent catalysts for styrene hydrogenation. Complex 3 outperforms 4 with a four-fold faster rate. Additionally, adding increasing THF equivalents to 3, which would favor build-up of 3-THF, decreases the rate. We propose that altering the coordination sphere of the Lu support can influence the resulting properties and catalytic activity of the active Ni(0) metal center.
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Affiliation(s)
- Bianca L Ramirez
- Department of Chemistry , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA .
| | - Prachi Sharma
- Department of Chemistry , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA . .,Minnesota Supercomputing Institute , Chemical Theory Center , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA
| | - Reed J Eisenhart
- Department of Chemistry , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA .
| | - Laura Gagliardi
- Department of Chemistry , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA . .,Minnesota Supercomputing Institute , Chemical Theory Center , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA
| | - Connie C Lu
- Department of Chemistry , University of Minnesota , Minneapolis , Minnesota 55455-0431 , USA .
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10
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Zhao Y, Chen S, Ji Y, Singh V, Ma P, Lu J, Niu J, Wang J. Ln(iii)-Containing polyoxomolybdates based on β-{Mo8O28}: microwave synthesis and optical and magnetic properties. CrystEngComm 2019. [DOI: 10.1039/c9ce00229d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactant mother liquor can be obtained by 600 watt microwave irradiation for 15 minutes. Under ultraviolet irradiation, these two compounds can undergo the photochromic process, and the fading process can occur after the ultraviolet irradiation was turned off.
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Affiliation(s)
- Yanxin Zhao
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Shumin Chen
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Yanfang Ji
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Vikram Singh
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Pengtao Ma
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jingkun Lu
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jingyang Niu
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jingping Wang
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
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11
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Comba P, Daumann LJ, Klingeler R, Koo C, Riley MJ, Roberts AE, Wadepohl H, Werner J. Correlation of Structural and Magnetic Properties in a Set of Mononuclear Lanthanide Complexes. Chemistry 2018; 24:5319-5330. [PMID: 29405448 DOI: 10.1002/chem.201704822] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Indexed: 11/06/2022]
Abstract
The electronic and magnetic properties of a set of mononuclear terbium(III) and dysprosium(III) complexes with two tetradentate 1-hydroxy-pyridin-2-one (1,2-HOPO) ligands are reported. Two primary coordination geometries are observed, depending on the length of the linker between the 1,2-HOPO donor moieties and the resulting arrangements of the linker. Fine details of the magnetic circular dichroism (MCD) spectra of the dysprosium(III) complexes illustrate differences in the splitting of the J multiplets and allow for a thorough ligand field analysis. High frequency electron paramagnetic resonance (HF-EPR) studies of the terbium(III) complexes give insight into the composition of the ground states. Ab initio calculations are utilized to rationalize the experimental results and further illustrate the effect of the structural features on the electronic and magnetic properties of the different complexes.
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Affiliation(s)
- Peter Comba
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, 69120, Heidelberg, Germany.,Interdisziplinäres Zentrum für Wissenschaftliches Rechnen (IWR), INF 205, 69120, Heidelberg, Germany
| | - Lena J Daumann
- Fakultät für Chemie und Pharmazie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, Munich, Germany
| | - Rüdiger Klingeler
- Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120, Heidelberg, Germany.,Centre for Advanced Materials (CAM), Universität Heidelberg, INF 225, 69120, Heidelberg, Germany
| | - Changhyun Koo
- Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120, Heidelberg, Germany
| | - Mark J Riley
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Asha E Roberts
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, 69120, Heidelberg, Germany.,Interdisziplinäres Zentrum für Wissenschaftliches Rechnen (IWR), INF 205, 69120, Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Universität Heidelberg, INF 270, 69120, Heidelberg, Germany
| | - Johannes Werner
- Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120, Heidelberg, Germany
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12
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Horii Y, Kishiue S, Damjanović M, Katoh K, Breedlove BK, Enders M, Yamashita M. Supramolecular Approach for Enhancing Single-Molecule Magnet Properties of Terbium(III)-Phthalocyaninato Double-Decker Complexes with Crown Moieties. Chemistry 2018; 24:4320-4327. [PMID: 29265595 DOI: 10.1002/chem.201705378] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Indexed: 11/10/2022]
Abstract
A TbIII -phthalocyaninato double-decker ([1]0 ) single-molecule magnet (SMM) having four 15-crown-5 moieties in one of the ligands was synthesized, and its dimerization and magnetic properties were studied in an attempt to utilize the supramolecular aggregation for enhancing the SMM properties. Aggregation of [1]0 to form [12 K4 ]4+ in the presence of K+ ions was studied by using UV/Vis-NIR absorption and NMR spectroscopies. For the magnetic measurements, [1]0 and [12 K4 ]4+ were dispersed in poly(methyl methacrylate) (PMMA). UV/Vis-NIR absorption measurements on the PMMA dispersed samples were used to track the formation of [12 K4 ]4+ . Direct current (DC) magnetic susceptibility measurements revealed that there were ferromagnetic Tb-Tb interactions in [12 K4 ]4+ , whereas there was no indication of ferromagnetic interactions in [1]0 . Upon the formation of [12 K4 ]4+ from [1]0 and K+ ions, the temperature at which the magnetic hysteresis occurred increased from 7 to 15 K. In addition, the area of magnetic hysteresis became larger for [12 K4 ]4+ , meaning that SMM properties of [12 K4 ]4+ are superior to those of [1]0 . Alternating current (AC) magnetic measurements were used to confirm this observation. Magnetic relaxation times at 2 K increased 1000-fold upon dimerization of [1]0 to [12 K4 ]4+ , demonstrating the effectiveness of using K+ ions to induce dimer formation for the improvement of the SMM properties.
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Affiliation(s)
- Yoji Horii
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
| | - Shuhei Kishiue
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
| | - Marko Damjanović
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology, Wolfgang-Gaede-Strasse 1, Karlsruhe, 76131, Germany.,Institute of Inorganic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
| | - Markus Enders
- Institute of Inorganic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan.,WPI Research Center, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
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13
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Mannich Base Ligands as Versatile Platforms for SMMs. TOP ORGANOMETAL CHEM 2018. [DOI: 10.1007/3418_2018_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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14
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Jiang L, Liu Y, Liu X, Tian J, Yan S. Three series of heterometallic NiII–LnIII Schiff base complexes: synthesis, crystal structures and magnetic characterization. Dalton Trans 2017; 46:12558-12573. [DOI: 10.1039/c7dt02351k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Three series of NiII–LnIII complexes were synthesized using compartmental Schiff base ligands in conjunction with auxiliary ligands. Their magnetic properties have been well studied.
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Affiliation(s)
- Lin Jiang
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Yue Liu
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Xin Liu
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Jinlei Tian
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Shiping Yan
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
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15
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Damjanović M, Samuel PP, Roesky HW, Enders M. NMR analysis of an Fe(i)–carbene complex with strong magnetic anisotropy. Dalton Trans 2017; 46:5159-5169. [PMID: 28352888 DOI: 10.1039/c7dt00408g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A paramagnetic, easy-plane anisotropic FeI complex, bearing cyclic-alkyl(amino) carbene (cAAC) ligands, is studied by means of NMR and DFT.
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Affiliation(s)
- Marko Damjanović
- Institute of Inorganic Chemistry
- Heidelberg University
- D-69120 Heidelberg
- Germany
| | - Prinson P. Samuel
- Universität Göttingen
- Institut für Anorganische Chemie
- Göttingen
- Germany
| | - Herbert W. Roesky
- Universität Göttingen
- Institut für Anorganische Chemie
- Göttingen
- Germany
| | - Markus Enders
- Institute of Inorganic Chemistry
- Heidelberg University
- D-69120 Heidelberg
- Germany
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