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Zhu S, Wu W, Hong D, Chai F, Huang Z, Zhu X, Zhou S, Wang S. Synthesis and Reactivity of the Rare-Earth Metal Complexes Bearing the Indol-2-yl-Based NCN Pincer Ligand. Inorg Chem 2024; 63:14860-14875. [PMID: 39069833 DOI: 10.1021/acs.inorgchem.4c00981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
The pincer rare-earth dialkyl complexes [κ3-LRE(CH2SiMe3)2 (RE = Lu(1a), Yb(1b), Er(1c), Y(1d), Dy(1e))] with the indol-2-yl-based NCN pincer ligand were synthesized by the reactions of the proligand HL (L = 1-Me2NCH2CH2-3-(2-iPrC6H5N═CH)C8H4N) with RE(CH2SiMe3)3(THF)2. These complexes exhibited a variety of reactivities toward organic compounds such as amines, triphenylphosphine ylide, N-phenylimidazole, pyridine derivatives, and o-carborane leading to σ-bond metathesis, migration insertion, and redox reaction products. The reactions of the dialkyl rare-earth metal complexes with o-carborane afforded the novel NCN pincer-ligated carboryne-based metallacyclopropanes which reacted with diphenyl ketone to give insertion products of the RE-C2-ind and one of the RE-Ccage bonds, while the reaction of the carboryne-based metallacyclopropanes with diphenyldiazomethane produced the di-aza-metallacyclopentanes via the insertions of the N═N bond of the diphenyldiazomethane into two RE-Ccage bonds and the RE-C2-ind bond. The reactions of the dialkyl complexes with 2 equiv of 2,2'-bipyridine afforded the pincer-ligated bis(2,2'-bipyridyl monoanionic radical) complexes via the homolytic redox reaction.
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Affiliation(s)
- Shan Zhu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China
| | - Weikang Wu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China
| | - Dongjing Hong
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China
| | - Fuxiang Chai
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China
| | - Zeming Huang
- Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, PR China
| | - Xiancui Zhu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China
| | - Shuangliu Zhou
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China
| | - Shaowu Wang
- Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, PR China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, PR China
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Wang JL, Chen JT, Yan H, Wang TT, Zhang YQ, Sun WB. Constructing high axiality mononuclear dysprosium molecular magnets via a regulation-of-co-ligands strategy. Dalton Trans 2024; 53:10982-10990. [PMID: 38874222 DOI: 10.1039/d4dt00040d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
Two lanthanide complexes with formulae [DyIII(LN5)(pentafluoro-PhO)3] (1) and [DyIII(LN5)(2,6-difluoro-PhO)2](BPh4) (2) (LN5 = 2,14-dimethyl-3,6,10,13,19-pentaazabicyclo[13.3.1]nonadecal (19),2,13,15,17-pentaene) were structurally and magnetically characterized. DyIII ions lie in the cavity of a five coordinate nitrogen macrocycle, and in combination with the introduction of multi-fluorinated monodentate phenoxyl coligands a high axiality coordination symmetry is built. Using the pentafluorophenol co-ligand, complex 1 with a D2d coordination environment, is obtained and displays moderate single-molecule magnets (SMMs) behavior. When difluorophenol co-ligands were used, a higher local axisymmetric pentagonal bipyramidal coordination geometry was observed in complex 2, which displays apparent slow magnetic relaxation behavior with a hysteresis temperature of up to 5 K. Further magnetic studies of diluted samples combined with ab initio calculations indicate that the high axiality plays a crucial role in suppressing quantum tunneling of magnetization (QTM) and consequently results in good slow magnetic relaxation behavior. Different fluoro-substituted phenoxyl co-ligands have phenoloxy oxygen atoms with different electrostatic potentials as well as a different number of phenoloxy coligands along the magnetic axis, resulting in different ligand field strengths and coordination symmetries.
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Affiliation(s)
- Jia-Ling Wang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science Heilongjiang University, 74 Xuefu Road, Harbin 150080, P. R. China.
| | - Ji-Tun Chen
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science Heilongjiang University, 74 Xuefu Road, Harbin 150080, P. R. China.
| | - Han Yan
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science Heilongjiang University, 74 Xuefu Road, Harbin 150080, P. R. China.
| | - Tian-Tian Wang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science Heilongjiang University, 74 Xuefu Road, Harbin 150080, P. R. China.
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, P. R. China.
| | - Wen-Bin Sun
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science Heilongjiang University, 74 Xuefu Road, Harbin 150080, P. R. China.
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3
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Kosloski-Oh S, Knight KD, Fieser ME. Enhanced Control of Isoprene Polymerization with Trialkyl Rare Earth Metal Complexes through Neutral Donor Support. Inorg Chem 2024; 63:9464-9477. [PMID: 38063304 PMCID: PMC11134520 DOI: 10.1021/acs.inorgchem.3c03161] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 11/14/2023] [Accepted: 11/20/2023] [Indexed: 05/28/2024]
Abstract
The development of catalysts for stereospecific polymerization of 1,3-dienes is an area of interest due to the robust nature of poly(1,3-diene)s' physical and mechanical properties, as well as the material's versatility in many applications. Dialkyl rare earth metal complexes supported by a diverse cast of ligand frameworks are selective for the polymerization of 1,3-dienes and are an exciting option for examination. However, development in this area has been hampered by the focus on complex catalyst systems that are costly to make. In this study, we synthesize a series of simple homoleptic trialkyl rare earth metal precatalysts and highlight their efficacy for isoprene polymerization using 1 or 2 equiv of [Ph3C][B(C6F5)4] activator. We investigated the addition of commercially available in situ donors, leading to the identification of triphenylphosphine as an ideal support to enhance the dispersity control and prevent loss of catalyst activity. We demonstrated how the activation and reaction conditions, including the order/time of reagent addition and donor electronics, had a major impact on the rate, control, and selectivity for the polymerization of 1,3-dienes. Further interrogation of the catalyst system signals the crucial role of triphenylphosphine in providing enhanced stability and control in this living catalyst system.
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Affiliation(s)
- Sophia
C. Kosloski-Oh
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Kai D. Knight
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Megan E. Fieser
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Wrigley
Institute for Environment and Sustainability, University of Southern California, Los Angeles, California 90089, United States
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4
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Zhu S, Xu W, Hong D, Wu W, Chai F, Zhu X, Zhou S, Wang S. Rare-Earth Metal Complexes Supported by 1,3-Functionalized Indolyl-Based Ligands for Efficient Hydrosilylation of Alkenes. Inorg Chem 2023; 62:381-391. [PMID: 36576868 DOI: 10.1021/acs.inorgchem.2c03488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Two different 1,3-functionalized indolyl-based proligands 1-(2-C4H7O)CH2-3-(2-tBuC6H5N═CH)C8H5N (HL1) and 1-Me2NCH2CH2-3-(2-iPrC6H5N═CH)C8H5N (HL2) were designed, prepared in high yields, and successfully applied to rare-earth metal chemistry showing different reactivities and different bondings with the central metals. The reactions of HL1 with RE(CH2SiMe3)3(THF)2 provided two types of rare-earth metal complexes: the pincer type mononuclear complexes κ3-(L1)RE(CH2SiMe3)2 [L1 = 1-(2-C4H7O)CH2-3-(2-tBuC6H5N═CH)C8H4N, RE = Lu(1), Yb(2)], and the dinuclear rare-earth metal alkyl (per alkyl/per metal) complexes having the ligand in novel coordination modes {(η1:(μ-η2:η1):η1-1-(2-C4H7O)CH2-3-[2-tBuC6H5NCH-(CH2SiMe3)]C8H4N)RECH2SiMe3}2 [RE = Er(3), Y(4), Dy(5), and Gd(6)]. Meanwhile, the reactions of HL2 with RE(CH2SiMe3)3(THF)2 led to the isolation and characterization of only the mononuclear rare-earth metal dialkyl complexes κ3-(L2)RE(CH2SiMe3)2 [L2 = 1-Me2NCH2CH2-3-(2-iPrC6H5N═CH)C8H4N, RE = Lu(7), Gd(8)] bearing the ligand in the pincer chelate form. The mononuclear complexes were formed through the sp2 C-H activation of the 2-indolyl moiety, while the dinuclear complexes were produced unexpectedly through the tandem 2-indolyl sp2 C-H activation and C═N insertion into the RE-CH2SiMe3 bond. These complexes were fully characterized by spectroscopic methods, elemental analyses, and single-crystal X-ray crystallography. The applications of the synthesized complexes as catalysts for the hydrosilylation of terminal alkenes with phenylsilane are described. Anti-Markovnikov addition products were produced by the hydrosilylation of aliphatic olefins, and Markovnikov addition products were isolated with aromatic olefins with high selectivity in the absence of cocatalysts. It is found that the dinuclear rare-earth alkyl complexes exhibited the best catalytic activity with the advantages of mild reaction conditions, short reaction time, low catalyst loading, and wide substrate applicability in comparison with the synthesized mononuclear complexes and the reported catalysts.
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Affiliation(s)
- Shan Zhu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Wenxiang Xu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Dongjing Hong
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Weikang Wu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Fuxiang Chai
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Xiancui Zhu
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Shuangliu Zhou
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Shaowu Wang
- Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Culture Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China.,Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
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5
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Zhang B, Guo X, Tan P, Lv W, Bai X, Zhou Y, Yuan A, Chen L, Liu D, Cui HH, Wang R, Chen XT. Axial Ligand as a Critical Factor for High-Performance Pentagonal Bipyramidal Dy(III) Single-Ion Magnets. Inorg Chem 2022; 61:19726-19734. [PMID: 36417790 DOI: 10.1021/acs.inorgchem.2c02476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The choice of axial ligands is of great importance for the construction of high-performance Dy-based single-molecule magnets (SMMs). Here, combining axial ligands Ph3SiO- (anion of triphenylsilanol) and 2,6-dichloro-4-nitro-PhO- (the anion of 2,6-dichloro-4-nitrophenol) with a neutral macrocyclic ligand 2,14-dimethyl-3,6,10,13,19-pentaazabicyclo[13.3.1]nonadeca-1(19),2,13,15,17-pentaene (L2N5) generates two new pentagonal bipyramidal Dy(III) complexes [DyIII(L2N5) (X)2](BPh4) (X = Ph3SiO-, 1; 2,6-dichloro-4-nitro-PhO-, 2) with strong axial ligand fields. Magnetic characterizations show that 1 possesses a large energy barrier above 1000 K and a magnetic hysteresis up to 9 K, whereas 2 only displays field-induced peaks of alternating-current susceptibilities without the hysteresis loop, even though 2 has a similar coordination geometry with 1. Detailed Ab initio calculations indicate an apparent difference in the axial negative charge between both complexes, which is caused by the diverse electron-donating properties of the axial ligands. The present work provides an efficient strategy to enhance the SMMs' properties, which highlights that the electron-donating property of the axial ligands is especially important for constructing the high-performance Dy-based SMMs.
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Affiliation(s)
- Ben Zhang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Xuefeng Guo
- Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an 710072, P. R. China
| | - Pengfei Tan
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Wei Lv
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Xiaoye Bai
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Yang Zhou
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Aihua Yuan
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Lei Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Dan Liu
- Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an 710072, P. R. China
| | - Hui-Hui Cui
- School of Chemistry and Chemical Engineering, Nantong University, Jiangsu 226019, P. R. China
| | - Ruosong Wang
- Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi'an 710072, P. R. China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
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6
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Abstract
The number of rare earth (RE) starting materials used in synthesis is staggering, ranging from simple binary metal-halide salts to borohydrides and "designer reagents" such as alkyl and organoaluminate complexes. This review collates the most important starting materials used in RE synthetic chemistry, including essential information on their preparations and uses in modern synthetic methodologies. The review is divided by starting material category and supporting ligands (i.e., metals as synthetic precursors, halides, borohydrides, nitrogen donors, oxygen donors, triflates, and organometallic reagents), and in each section relevant synthetic methodologies and applications are discussed.
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Affiliation(s)
- Fabrizio Ortu
- School of Chemistry, University of Leicester, LE1 7RH Leicester, U.K.
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7
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Cai X, Cheng Z, Wu Y, Jing R, Tian SQ, Chen L, Li ZY, Zhang YQ, Cui HH, Yuan A. Tuning the Equatorial Negative Charge in Hexagonal Bipyramidal Dysprosium(III) Single-Ion Magnets to Improve the Magnetic Behavior. Inorg Chem 2022; 61:3664-3673. [PMID: 35171611 DOI: 10.1021/acs.inorgchem.1c03775] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Taking advantage of the pentaethylene glycol (EO5) and deprotonation of EO5, a family of new structurally hexagonal bipyramidal Dy(III) complexes, [Dy(EO5)(2,6-dichloro-4-nitro-PhO)2](2,6-dichloro-4-nitro-PhO) (1), [Dy(EO5-BPh2)(2,6-dichloro-4-nitro-PhO)2] (2), and [Dy(EO5-BPh2)(2,6-dichloro-4-nitro-PhO)Cl] (3), were controbllably synthesized and structurally characterized. Magnetic measurements show that complex 1 is a zero-field SIM and has an observable hysteresis opening up to 4 K. Conversely, only under extra magnetic field is slow magnetic relaxation observed in 2 and 3. This considerable difference in the magnetic behavior is mainly caused by the change of the equatorial negative charge. Detailed ab initio calculations further elucidate that the quantum tunneling is induced by the presence of equatorial negative charge, and the magnetic anisotropy depends on the axial ligands. This work demonstrates that the absence of the equatorial negative charge should also be considered in the rational design of promising single molecular magnets based on the oblate ions.
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Affiliation(s)
- Xingwei Cai
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, P. R. China
| | - Zhijie Cheng
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, P. R. China
| | - Yingying Wu
- School of Materials Science and Engineering, Nankai University, 38 Tongyan Road, Haihe Educational Park, Tianjin 300350, P. R. China
| | - Rong Jing
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, P. R. China
| | - Shuang-Qin Tian
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, P. R. China
| | - Lei Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, P. R. China
| | - Zhao-Yang Li
- School of Materials Science and Engineering, Nankai University, 38 Tongyan Road, Haihe Educational Park, Tianjin 300350, P. R. China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, P. R. China
| | - Hui-Hui Cui
- School of Chemistry and Chemical Engineering, Nantong University, Jiangsu 226019, P. R. China
| | - Aihua Yuan
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, P. R. China
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Borah A, Murugavel R. Magnetic relaxation in single-ion magnets formed by less-studied lanthanide ions Ce(III), Nd(III), Gd(III), Ho(III), Tm(II/III) and Yb(III). Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214288] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Tan P, Yang Y, Lv W, Jing R, Cui H, Zheng SJ, Chen L, Yuan A, Chen XT, Zhao Y. A cyanometallate- and carbonate-bridged dysprosium chain complex with a pentadentate macrocyclic ligand: synthesis, structure, and magnetism. NEW J CHEM 2022. [DOI: 10.1039/d2nj00784c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A novel one-dimensional polymeric cyanometallate- and carbonate-bridged dysprosium(iii) chain with a pentadentate macrocyclic ligand exhibits field-induced multiple-relaxation processes.
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Affiliation(s)
- Pengfei Tan
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Yimou Yang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Wei Lv
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Rong Jing
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Huihui Cui
- School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, P. R. China
| | - Shao-Jun Zheng
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Lei Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Aihua Yuan
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Yuyuan Zhao
- School of Medical Technology, Zhenjiang College, Zhenjiang 212003, P. R. China
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10
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Xi J, Cen P, Guo Y, Li Y, Qin Y, Zhang YQ, Song W, Liu X. Reversible on-off switching of Dy(III) single-molecule magnets via single-crystal-to-single-crystal transformation. Dalton Trans 2022; 51:6707-6717. [DOI: 10.1039/d2dt00501h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While the interest in single-molecule magnets (SMMs) lies in their potential applications in information storage and quantum computing, the switching of their slow magnetic relaxation associated with dynamic crystal-to-crystal transformation...
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11
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Yu S, Hu HC, Liu D, Liang Y, Liang F, Yin B, Chen Z. Structural and magnetic studies of six-coordinated Schiff base Dy(III) complexes. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00356b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With the aim to tune magnetic anisotropies of six-coordinated Dy(III) complexes, four bis-Schiff bases bearing different spacers and one mono-Schiff base were designed, which are bis(2-hydroxylnaphthalenylmethylene)hydrazine (H2L1), bis(2-hydroxylnaphthylmethylene)ethylenediamine (H2L2), bis(2-hydroxylnaphthylmethylene)-propylenediamine...
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12
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Mortis A, Maichle-Mössmer C, Anwander R. Yttrium tris(trimethylsilylmethyl) complexes grafted onto MCM-48 mesoporous silica nanoparticles. Dalton Trans 2021; 51:1070-1085. [PMID: 34939637 DOI: 10.1039/d1dt03876a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of tris(trimethylsilylmethyl) yttrium donor adduct complexes was synthesized and fully characterized by X-ray diffraction, 1H/13C/29Si/31P/89Y heteronuclear NMR and FTIR spectroscopies as well as elemental analyses. Treatment of Y(CH2SiMe3)3(thf)x with various donors Do led to complete (Do = TMEDA, DMAP) and partial displacement of THF (Do = NHCiPr, DMPE). Exceptionally large 89Y NMR shifts to low field were observed for the new complexes. Complexes Y(CH2SiMe3)3(tmeda) and Y(CH2SiMe3)3(dmpe)(thf) were chosen to perform surface organometallic chemistry, due to a comparatively higher thermal stability and the availability of the 31P nucleus as a spectroscopic probe, respectively. Mesoporous nanoparticles of the MCM-48-type were synthesized and used as a 3rd generation silica support. The parent and hybrid materials were characterized using X-ray powder diffraction, solid-state-NMR spectroscopy, DRIFTS, elemental analyses, N2-physisorption, and scanning electron microscopy (SEM). The presence of surface-bound yttrium alkyl moieties was further proven by the reaction with carbon dioxide. Quantification of the surface silanol population by means of HN(SiHMe2)2-promoted surface silylation is shown to be superior to titration with lithium alkyl LiCH2SiMe3.
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Affiliation(s)
- Alexandros Mortis
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
| | - Cäcilia Maichle-Mössmer
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
| | - Reiner Anwander
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
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13
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Klahn EA, Thiel AM, Degn RB, Kibalin I, Gukassov A, Wilson C, Canaj AB, Murrie M, Overgaard J. Magnetic anisotropies of Ho(III) and Dy(III) single-molecule magnets experimentally determined via polarized neutron diffraction. Dalton Trans 2021; 50:14207-14215. [PMID: 34550149 DOI: 10.1039/d1dt01959g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present the magnetic anisotropy of two isostructural pentagonal-bipyramidal complexes, [Ln(H2O)5(HMPA)2]I3·2HMPA (HMPA = hexamethylphosphoramide, Ln = Dy, Ho). Using ac magnetic susceptibility measurements, we find magnetic relaxation barriers of 600 K and 270 K for the Dy- and Ho-compounds, respectively. This difference is supported by polarized neutron diffraction (PND) measured at 5 K and 1 T which provides the first experimental evidence that the transverse elements in the magnetic anisotropy of the Ho-analogue are significant, whereas the Dy-analogue has a near-axial magnetic anisotropy with vanishing transverse contributions. The coordination geometries of the two complexes are highly similar, and we attribute the loss of strong magnetic axiality as expressed in the atomic susceptibility tensors from PND, as well as the smaller relaxation barrier in the Ho-complex compared to the Dy-complex, to the less favorable interaction of the pentagonal bipyramidal crystal field with the characteristics of the Ho(III) 4f-charge distribution.
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Affiliation(s)
- Emil A Klahn
- Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
| | - Andreas M Thiel
- Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
| | - Rasmus B Degn
- Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
| | - Iurii Kibalin
- Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif-sur-Yvette, France
| | - Arsen Gukassov
- Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif-sur-Yvette, France
| | - Claire Wilson
- School of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK.
| | - Angelos B Canaj
- School of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK.
| | - Mark Murrie
- School of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK.
| | - Jacob Overgaard
- Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark.
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14
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Rodríguez-Barea B, Mayans J, Rabelo R, Sanchis-Perucho A, Moliner N, Martínez-Lillo J, Julve M, Lloret F, Ruiz-García R, Cano J. Holmium(III) Single-Ion Magnet for Cryomagnetic Refrigeration Based on an MRI Contrast Agent Derivative. Inorg Chem 2021; 60:12719-12723. [PMID: 34424680 PMCID: PMC8424628 DOI: 10.1021/acs.inorgchem.1c01905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The coexistence of field-induced blockage of the magnetization and significant magnetocaloric effects in the low-temperature region occurs in a mononuclear holmium(III) diethylenetriamine-N,N,N',N″,N″-pentaacetate complex, whose gadolinium(III) analogue is a commercial MRI contrast agent. Both properties make it a suitable candidate for cryogenic magnetic refrigeration, thus enlarging the variety of applications of this simple class of multifunctional molecular nanomagnets.
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Affiliation(s)
- Borja Rodríguez-Barea
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Júlia Mayans
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Renato Rabelo
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Adrián Sanchis-Perucho
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Nicolás Moliner
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - José Martínez-Lillo
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Miguel Julve
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Francesc Lloret
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Rafael Ruiz-García
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
| | - Joan Cano
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Facultat de Química, Universitat de València, Paterna, València 46980, Spain
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15
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Jia K, Meng X, Wang M, Gou X, Wang YX, Xu N, Shi W, Cheng P. Enhancing the energy barrier and hysteresis temperature in two benchtop-stable Ho(iii) single-ion magnets. Chem Commun (Camb) 2021; 57:3607-3610. [PMID: 33721006 DOI: 10.1039/d1cc00582k] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The energy barrier and hysteresis temperature in two benchtop-stable D5h-symmetry HoIII single-ion magnets were significantly enhanced via the variation of the halogen anion. The coexistence of a high energy barrier of 418 K and hysteresis temperature of 15 K was observed in the bromide-ion containing HoIII single-ion magnet.
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Affiliation(s)
- Kexin Jia
- Department of Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
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16
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Wang J, Zakrzewski JJ, Zychowicz M, Vieru V, Chibotaru LF, Nakabayashi K, Chorazy S, Ohkoshi SI. Holmium(iii) molecular nanomagnets for optical thermometry exploring the luminescence re-absorption effect. Chem Sci 2020; 12:730-741. [PMID: 34163806 PMCID: PMC8179016 DOI: 10.1039/d0sc04871b] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 10/30/2020] [Indexed: 11/21/2022] Open
Abstract
Coordination complexes of lanthanide(3+) ions can combine Single-Molecule Magnetism (SMM) with thermally modulated luminescence applicable in optical thermometry. We report an innovative approach towards high performance SMM-based optical thermometers which explores tunable anisotropy and the luminescence re-absorption effect of HoIII complexes. Our concept is shown in dinuclear cyanido-bridged molecules, {[HoIII(4-pyridone)4(H2O)2][MIII(CN)6]}·nH2O (M = Co, 1; Rh, 2; Ir, 3) and their magnetically diluted analogues, {[HoIII x YIII 1-x (4-pyridone)4(H2O)2][MIII(CN)6]}·nH2O (M = Co, x = 0.11, 1@Y; Rh, x = 0.12, 2@Y; Ir, x = 0.10, 3@Y). They are built of pentagonal bipyramidal HoIII complexes revealing the zero-dc-field SMM effect. Experimental studies and the ab initio calculations indicate an Orbach magnetic relaxation with energy barriers varying from 89.8 to 86.7 and 78.7 cm-1 K for 1, 2, and 3, respectively. 1-3 also differ in the strength of quantum tunnelling of magnetization which is suppressed by hyperfine interactions, and, further, by the magnetic dilution. The YIII-based dilution governs the optical properties as 1-3 exhibit poor emission due to the dominant re-absorption from HoIII while 1@Y-3@Y show room-temperature blue emission of 4-pyridone. Within ligand emission bands, the sharp re-absorption lines of the HoIII electronic transitions were observed. Their strong thermal variation was used in achieving highly sensitive ratiometric optical thermometers whose good performance ranges, lying between 25 and 205 K, are adjustable by using hexacyanidometallates. This work shows that HoIII complexes are great prerequisites for advanced opto-magnetic systems linking slow magnetic relaxation with unique optical thermometry exploiting a luminescence re-absorption phenomenon.
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Affiliation(s)
- Junhao Wang
- Department of Chemistry, School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Jakub J Zakrzewski
- Faculty of Chemistry, Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
| | - Mikolaj Zychowicz
- Faculty of Chemistry, Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Veacheslav Vieru
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven Celestijnenlaan 200F 3001 Leuven Belgium
- Maastricht Science Programme, Faculty of Science and Engineering, Maastricht University Paul-Henri Spaaklaan 1 6229 EN Maastricht The Netherlands
| | - Liviu F Chibotaru
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Koji Nakabayashi
- Department of Chemistry, School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Szymon Chorazy
- Faculty of Chemistry, Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
| | - Shin-Ichi Ohkoshi
- Department of Chemistry, School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
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17
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Canaj AB, Dey S, Wilson C, Céspedes O, Rajaraman G, Murrie M. Engineering macrocyclic high performance pentagonal bipyramidal Dy(iii) single-ion magnets. Chem Commun (Camb) 2020; 56:12037-12040. [DOI: 10.1039/d0cc04559d] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We highlight the vast synthetic scope for macrocyclic engineering of magnetic anisotropy, generating a high performance pentagonal bipyramidal Dy(iii) single-ion magnet where the weak equatorial ligand field is created entirely by using a macrocycle.
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Affiliation(s)
- Angelos B. Canaj
- School of Chemistry
- University of Glasgow
- University Avenue
- Glasgow
- UK
| | - Sourav Dey
- Department of Chemistry
- Indian Institute of Technology Bombay
- Powai
- Mumbai
- India
| | - Claire Wilson
- School of Chemistry
- University of Glasgow
- University Avenue
- Glasgow
- UK
| | - Oscar Céspedes
- School of Physics and Astronomy
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Powai
- Mumbai
- India
| | - Mark Murrie
- School of Chemistry
- University of Glasgow
- University Avenue
- Glasgow
- UK
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