1
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Ma YZ, Yu L, Zhou Q, Fu W. Dinuclear ytterbium(III) benzamidinate complexes with bridging S 32-, Se 22- and Te 22- ligands: synthesis, structure and magnetic properties. Dalton Trans 2024; 53:8118-8123. [PMID: 38690725 DOI: 10.1039/d4dt00724g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Treatment of Yb(II) complex [L2Yb(THF)2] (L = PhC(NSiMe3)2) with elemental sulfur, selenium or tellurium resulted in the isolation of a series of dinuclear Yb(III) complexes featuring side-on bound S32- (1), Se22- (2) or Te22- (3) moieties, respectively. Magnetic study on these complexes revealed that 3 is a rare lanthanide telluride single-molecule magnet (SMM).
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Affiliation(s)
- Ying-Zhao Ma
- Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China.
| | - Lian Yu
- Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China.
| | - Qi Zhou
- Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China.
| | - Wensheng Fu
- Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China.
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2
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Knüpfer C, Klerner L, Mai J, Langer J, Harder S. s-Block metal complexes of superbulky ( tBu 3Si) 2N -: a new weakly coordinating anion? Chem Sci 2024; 15:4386-4395. [PMID: 38516089 PMCID: PMC10952107 DOI: 10.1039/d3sc06896j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 02/19/2024] [Indexed: 03/23/2024] Open
Abstract
Sterically hindered amide anions have found widespread application as deprotonation agents or as ligands to stabilize metals in unusual coordination geometries or oxidation states. The use of bulky amides has also been advantageous in catalyst design. Herein we present s-block metal chemistry with one of the bulkiest known amide ligands: (tBu3Si)2N- (abbreviated: tBuN-). The parent amine (tBuNH), introduced earlier by Wiberg, is extremely resistant to deprotonation (even with nBuLi/KOtBu superbases) but can be deprotonated slowly with a blue Cs+/e- electride formed by addition of Cs0 to THF. (tBuN)Cs crystallized as a separated ion-pair, even without cocrystallized solvent. As salt-metathesis reactions with (tBuN)Cs are sluggish and incomplete, it has only limited use as an amide transfer reagent. However, ball-milling with LiI led to quantitative formation of (tBuN)Li and CsI. Structural characterization shows that (tBuN)Li is a monomeric contact ion-pair with a relatively short N-Li bond, an unusual T-shaped coordination geometry around N and extremely short Li⋯Me anagostic interactions. Crystal structures are compared with Li and Cs complexes of less bulky amide ligands (iPr3Si)2N- (iPrN-) and (Me3Si)2N- (MeN-). DFT calculations show trends in the geometries and electron distributions of amide ligands of increasing steric bulk (MeN- < iPrN- < tBuN-) and confirm that tBuN- is a rare example of a halogen-free weakly coordinating anion.
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Affiliation(s)
- Christian Knüpfer
- Inorganic and Organometallic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Lukas Klerner
- Inorganic and Organometallic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Jonathan Mai
- Inorganic and Organometallic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Jens Langer
- Inorganic and Organometallic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
| | - Sjoerd Harder
- Inorganic and Organometallic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstraße 1 91058 Erlangen Germany
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3
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Mironova OA, Sukhikh TS, Konchenko SN, Pushkarevsky NA. Structural Diversity and Multielectron Reduction Reactivity of Samarium(II) Iodido-β-diketiminate Complexes Dependent on Tetrahydrofuran Content. Inorg Chem 2022; 61:15484-15498. [PMID: 36130049 DOI: 10.1021/acs.inorgchem.2c02101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The molecular structures of complexes [Sm(Nacnac)I(thf)n] (Nacnac = HC(C(Me)Ndipp)2-, dipp = 2,6-diisopropylphenyl, thf = tetrahydrofuran) depending on the number of thf ligands are studied. The complete removal of thf from a known complex [Sm(Nacnac)I(thf)2] leads to a tetranuclear product [Sm(Nacnac)I]4 (4). The partial removal of thf results in mixtures of dinuclear [Sm2(Nacnac)2I2(thf)] (2), trinuclear [Sm3(Nacnac)3I3(thf)] (3), and tetranuclear [Sm4(Nacnac)4I4(thf)2] (4*) complexes and 4, depending on the conditions. The reaction of solvent-free SmI2 with 1 equiv of K(Nacnac) results mainly in [Sm(Nacnac)2] (1), while the interaction of 4 with certain amounts of thf allows obtaining pure 2 and 3 (with the admixture of 4*). Complex 4* is the exact dimer of 2, and both compounds are stable in solutions. Reactions with 3 and 4 as reductants are studied. 4 is oxidized by I2 to stoichiometrically yield two products, mixed-valent tetranuclear [Sm4(Nacnac)4I5] (5) and binuclear [Sm(Nacnac)I2]2 (6) complexes. In the reaction of 4 with nBu3PTe, a trinuclear complex [Sm3(Nacnac)3(μ-I)3(μ3-E)2] (8, E = I or Te) is formed in small amounts, with the formation of 6 as the second product. 3 serves as a two-electron reductant in the reaction with nBu3PTe to yield a trinuclear complex [Sm3(Nacnac)3I3(μ-Te2)] (7). Complexes 2, 4, 4*, 5, 6, and 8 possess a unique flat SmxIy core of heavy atoms, which is assumed to be a consequence of the Nacnac ligand geometry.
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Affiliation(s)
- Olga A Mironova
- Nikolaev Institute of Inorganic Chemistry SB RAS, Akademika Lavrentieva Ave. 3, 630090 Novosibirsk, Russia
| | - Taisiya S Sukhikh
- Nikolaev Institute of Inorganic Chemistry SB RAS, Akademika Lavrentieva Ave. 3, 630090 Novosibirsk, Russia
| | - Sergey N Konchenko
- Nikolaev Institute of Inorganic Chemistry SB RAS, Akademika Lavrentieva Ave. 3, 630090 Novosibirsk, Russia
| | - Nikolay A Pushkarevsky
- Nikolaev Institute of Inorganic Chemistry SB RAS, Akademika Lavrentieva Ave. 3, 630090 Novosibirsk, Russia
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4
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Extraction of 197mHg with TIBPS in HNO3 and HCl media. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08228-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Yoshida T, Shabana A, Zhang H, Izuogu DC, Sato T, Fuku K, Abe H, Horii Y, Cosquer G, Hoshino N, Akutagawa T, Thom AJW, Takaishi S, Yamashita M. Insight into the Gd–Pt Bond: Slow Magnetic Relaxation of a Heterometallic Gd–Pt Complex. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takefumi Yoshida
- Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aza-Aoba, Aramaki, Sendai 980-8578, Japan
| | - Ahmed Shabana
- Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aza-Aoba, Aramaki, Sendai 980-8578, Japan
- Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt
| | - Haitao Zhang
- Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aza-Aoba, Aramaki, Sendai 980-8578, Japan
| | - David Chukwuma Izuogu
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road, Cambridge, CB2 1EW, UK
- Department of Pure and Industrial Chemistry University of Nigeria, Nsukka, 410001, Enugu State (Nigeria)
| | - Tetsu Sato
- Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aza-Aoba, Aramaki, Sendai 980-8578, Japan
| | - Kentaro Fuku
- Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aza-Aoba, Aramaki, Sendai 980-8578, Japan
| | - Hitoshi Abe
- Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
- Department of Materials Structure Science, School of High Energy Accelerator Science, SOKENDAI(the Graduate University for Advanced Studies) 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
- 7Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Yoji Horii
- Department of Chemistry, Nara Womens` University, Kitauoyanishimachi, Nara 630-8503, Japan
| | - Goulven Cosquer
- Department of Chemistry, Graduate School of Science Hiroshima University, 1-3-1 Kagamiyama Higashihiroshima 739-8526, Japan
| | - Norihisa Hoshino
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
| | - Tomoyuki Akutagawa
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
| | - Alex J. W. Thom
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Road, Cambridge, CB2 1EW, UK
| | - Shinya Takaishi
- Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aza-Aoba, Aramaki, Sendai 980-8578, Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science Tohoku University, 6-3 Aza-Aoba, Aramaki, Sendai 980-8578, Japan
- School of Materials Science and Engineering Nankai University, Tianjin 300350, P.R. China
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6
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Savkov BY, Sukhikh TS, Konchenko SN, Pushkarevsky NA. Reduction of phosphine sulfides and selenides by samarium(ii) formamidinate as an approach to binuclear mono- and dichalcogenide complexes
†. Aust J Chem 2022. [DOI: 10.1071/ch21271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Seth K. Recent progress in rare-earth metal-catalyzed sp 2 and sp 3 C–H functionalization to construct C–C and C–heteroelement bonds. Org Chem Front 2022. [DOI: 10.1039/d1qo01859k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The review presents rare-earth metal-catalyzed C(sp2/sp3)–H functionalization accessing C–C/C–heteroatom bonds and olefin (co)polymerization, highlighting substrate scope, mechanistic realization, and origin of site-, enantio-/diastereo-selectivity.
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Affiliation(s)
- Kapileswar Seth
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) – Guwahati, Sila Katamur, Changsari, Kamrup 781101, Assam, India
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8
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Demkin AG, Savkov BY, Sukhikh TS, Konchenko SN. FIRST EXAMPLES OF MOLECULAR POLYCHALCOGENIDE
COMPLEXES OF THULIUM. J STRUCT CHEM+ 2021. [DOI: 10.1134/s0022476621060159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Sproules S. Electronic structure study of divanadium complexes with rigid covalent coordination: potential molecular qubits with slow spin relaxation. Dalton Trans 2021; 50:4778-4782. [PMID: 33877176 DOI: 10.1039/d1dt00709b] [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
The electronic structures of homovalent [V2(μ-S2)2(R2dtc)4] (R = Et, iBu) and mixed-valent [V2(μ-S2)2(R2dtc)4]+ are reported here. The soft-donor, eight-coordinate ligand shell combined with the fully delocalised ground state provides a highly rigid and covalent environment that will nurture long spin relaxation times in vanadyl-based molecular qubits.
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Affiliation(s)
- Stephen Sproules
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK.
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10
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Evans KJ, Morton PA, Sangster C, Mansell SM. One-step synthesis of heteroleptic rare-earth amide complexes featuring fluorenyl-tethered N-heterocyclic carbene ligands. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Philip P, Jose T, Jose A, Cherian SK. Studies on the structural and optical properties of samarium β-diketonate complex incorporated electrospun poly(methylmethacrylate) nanofibres with different architectures. LUMINESCENCE 2021; 36:1032-1047. [PMID: 33570221 DOI: 10.1002/bio.4029] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 12/30/2020] [Accepted: 02/09/2021] [Indexed: 11/08/2022]
Abstract
Electrospinning is the most favourable method for production of polymer nanofibres. In this study, we prepared a samarium β-diketonate complex that incorporated pure, surface-roughened and coaxial hollow poly(methylmethacrylate) (PMMA) nanofibres through electrospinning. The successful incorporation of this samarium complex into the PMMA nanofibres with different architectures was elucidated through various structural and morphological studies. Optical investigations as well as other characterization techniques for the pure, surface-roughened and coaxial hollow PMMA nanofibres before and after incorporating the samarium β-diketonate complex explained the host matrix nature of the PMMA nanofibres. Photoluminescence properties of the pure and structurally modified PMMA nanofibres were enhanced two or three times after incorporating the samarium complex into the fibre. Comparison of the optical properties between the pure and structurally modified PMMA nanofibres incorporating the samarium β-diketonate complex demonstrated the structural and optical improvements as well as the better host matrix nature of the surface-roughened and coaxial hollow PMMA nanofibres over pure PMMA nanofibres for the samarium β-diketonate complex. These optical enhancements make these materials applicable for various optical devices.
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Affiliation(s)
- Princy Philip
- Research and Post-Graduate Department of Chemistry, St. Berchmans College, Changanacherry, Mahatma Gandhi University, Kottayam, Kerala, India
| | - Tomlal Jose
- Research and Post-Graduate Department of Chemistry, St. Berchmans College, Changanacherry, Mahatma Gandhi University, Kottayam, Kerala, India
| | - Adon Jose
- School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala, India
| | - Shijo K Cherian
- Research and Post-Graduate Department of Chemistry, St. Berchmans College, Changanacherry, Mahatma Gandhi University, Kottayam, Kerala, India
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12
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Fener BE, Görls H, Krieck S, Westerhausen M. Sterically Encumbered 2,3‐Dihydrophosphindole and Its Chalcogenides. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Benjamin E. Fener
- Institute of Inorganic and Analytical Chemistry Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
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13
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Goodwin CAP. Blocking like it's hot: a synthetic chemists' path to high-temperature lanthanide single molecule magnets. Dalton Trans 2020; 49:14320-14337. [PMID: 33030172 DOI: 10.1039/d0dt01904f] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Progress in the synthesis, design, and characterisation of single-molecule magnets (SMMs) has expanded dramatically from curiosity driven beginnings to molecules that retain magnetization above the boiling point of liquid nitrogen. This is in no small part due to the increasingly collaborative nature of this research where synthetic targets are guided by theoretical design criteria. This article aims to summarize these efforts and progress from the perspective of a synthetic chemist with a focus on how chemistry can modulate physical properties. A simple overview is presented of lanthanide electronic structure in order to contextualize the synthetic advances that have led to drastic improvements in the performance of lanthanide-based SMMs from the early 2000s to the late 2010s.
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