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Richardson GM, Evans MJ, Rajeshkumar T, McCone JAJ, Cameron SA, Maron L, Jones C, Anker MD. Synthesis and Reactivity of Discrete Europium(II) Hydride Complexes. Chemistry 2024; 30:e202400681. [PMID: 38417144 DOI: 10.1002/chem.202400681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 02/27/2024] [Accepted: 02/28/2024] [Indexed: 03/01/2024]
Abstract
The bulky β-diketiminate ligand frameworks [BDIDCHP]- and [BDIDipp/Ar]- (BDI=[HC{C(Me)2N-Dipp/Ar}2]- (Dipp=2,6-diisopropylphenyl (Dipp); Ar=2,6-dicyclohexylphyenyl (DCHP) or 2,4,6-tricyclohexylphyenyl (TCHP)) have been developed for the kinetic stabilisation of the first europium (II) hydride complexes, [(BDIDCHP)Eu(μ-H)]2, [(BDIDipp/DCHP)Eu(μ-H)]2 and [(BDIDipp/TCHP)Eu(μ-H)]2, respectively. These complexes represent the first step beyond the current lanthanide(II) hydrides that are all based on ytterbium. Tuning the steric profile of β-diketiminate ligands from a symmetrical to unsymmetrical disposition, enhanced solubility and stability in the solution-state. This provides the first opportunity to study the structure and bonding of these novel Eu(II) hydride complexes crystallographically, spectroscopically and computationally, with their preliminary reactivity investigated.
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Affiliation(s)
- Georgia M Richardson
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
| | - Matthew J Evans
- School of Chemistry, PO Box 23, Monash University, VIC, 3800, Australia
| | - Thayalan Rajeshkumar
- Université de Toulouse et CNRS, INSA UPS, UMR5215, LPCNO, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - Jordan A J McCone
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
| | - Scott A Cameron
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA UPS, UMR5215, LPCNO, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - Cameron Jones
- School of Chemistry, PO Box 23, Monash University, VIC, 3800, Australia
| | - Mathew D Anker
- School of Chemical and Physical Sciences/Ferrier Institute, Victoria University of Wellington, PO Box 600, Wellington, 6012, New Zealand
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Bernbeck M, Orlova AP, Hilgar JD, Gembicky M, Ozerov M, Rinehart JD. Dipolar Coupling as a Mechanism for Fine Control of Magnetic States in ErCOT-Alkyl Molecular Magnets. J Am Chem Soc 2024; 146:7243-7256. [PMID: 38456803 PMCID: PMC10958522 DOI: 10.1021/jacs.3c10412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 02/13/2024] [Accepted: 02/14/2024] [Indexed: 03/09/2024]
Abstract
The design of molecular magnets has progressed greatly by taking advantage of the ability to impart successive perturbations and control vibronic transitions in 4fn systems through the careful manipulation of the crystal field. Herein, we control the orientation and rigidity of two dinuclear ErCOT-based molecular magnets: the inversion-symmetric bridged [ErCOT(μ-Me)(THF)]2 (2) and the nearly linear Li[(ErCOT)2(μ-Me)3] (3). The conserved anisotropy of the ErCOT synthetic unit facilitates the direction of the arrangement of its magnetic anisotropy for the purposes of generating controlled internal magnetic fields, improving control of the energetics and transition probabilities of the electronic angular momentum states with exchange biasing via dipolar coupling. This control is evidenced through the introduction of a second thermal barrier to relaxation operant at low temperatures that is twice as large in 3 as in 2. This barrier acts to suppress through-barrier relaxation by protecting the ground state from interacting with stray local fields while operating at an energy scale an order of magnitude smaller than the crystal field term. These properties are highlighted when contrasted against the mononuclear structure ErCOT(Bn)(THF)2 (1), in which quantum tunneling of the magnetization processes dominate, as demonstrated by magnetometry and ab initio computational methods. Furthermore, far-infrared magnetospectroscopy measurements reveal that the increased rigidity imparted by successive removal of solvent ligands when adding bridging methyl groups, along with the increased excited state purity, severely limits local spin-vibrational interactions that facilitate magnetic relaxation, manifesting as longer relaxation times in 3 relative to those in 2 as temperature is increased.
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Affiliation(s)
- Maximilian
G. Bernbeck
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Angelica P. Orlova
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Jeremy D. Hilgar
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Milan Gembicky
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
| | - Mykhaylo Ozerov
- National
High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Jeffrey D. Rinehart
- Department
of Chemistry and Biochemistry, University
of California—San Diego, La Jolla, California 92093, United States
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Richardson GM, Howarth J, Evans MJ, Edwards AJ, Cameron SA, Anker MD. Reactivity of a β-diketiminate ytterbium(II) hydride with cyclopentadiene derivatives. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2130277] [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]
Affiliation(s)
- Georgia M. Richardson
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Jesse Howarth
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Matthew J. Evans
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Alison J. Edwards
- Australian Nuclear Science and Technology Organisation, Australian Centre for Neutron Scattering, Sydney, Australia
| | - Scott A. Cameron
- Ferrier Research Institute, Victoria University of Wellington, Lower Hutt, New Zealand
| | - Mathew David Anker
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
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Wen Q, Rajeshkumar T, Maron L, Leng X, Chen Y. Synthesis, Characterization, and Reactivity of a Hydrido‐ and Imido‐Bridged Dinuclear Ytterbium(III) Complex. Angew Chem Int Ed Engl 2022; 61:e202200540. [DOI: 10.1002/anie.202200540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Qingqing Wen
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Thayalan Rajeshkumar
- LPCNO CNRS, & INSA Université Paul Sabatier 135 Avenue de Rangueil 31077 Toulous France
| | - Laurent Maron
- LPCNO CNRS, & INSA Université Paul Sabatier 135 Avenue de Rangueil 31077 Toulous France
| | - Xuebing Leng
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
| | - Yaofeng Chen
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 P. R. China
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Chen Y, Wen Q, Rajeshkumar T, Maron L, Leng X. Synthesis, Characterization and Reactivity of a Hydrido‐ and Imido‐Bridged Dinuclear Ytterbium(III) Complex. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yaofeng Chen
- Shanghai Institute of Organic Chemistry,Chinese Academy of Sciences State Key Laboratory of Organometallic Chemistry 354 Fenglin Road 200032 Shanghai CHINA
| | - Qingqing Wen
- Shanghai Institute of Organic Chemistry State Key Laboratory of Organometallic Chemistry CHINA
| | | | - Laurent Maron
- Université Paul Sabatier: Universite Toulouse III Paul Sabatier LPCNO FRANCE
| | - Xuebing Leng
- Shanghai Institute of Organic Chemistry State Key Laboratory of Organometallic Chemistry CHINA
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Shi X, Rajeshkumar T, Maron L, Cheng J. CO, CO 2 and CS 2 activation by divalent ytterbium hydrido complexes. Chem Commun (Camb) 2022; 58:1362-1365. [PMID: 34989379 DOI: 10.1039/d1cc06449e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Treatment of a divalent ytterbium hydride complex [(TpAd,iPr)Yb(H)(THF)] (TpAd,iPr = hydrotris(3-adamantyl-5-isopropyl-pyrazolyl)borate) (1) with CO, CO2 and CS2 resulted in the formation of a divalent ytterbium ethenediolate complex [(TpAd,iPr)Yb]2(cis-OCHCHO) (2), a formate complex [(TpAd,iPr)Yb(κ2-O2CH)(THF)] (3), and a trivalent ytterbium ethenetetrathiolate complex [(TpAd,iPr)YbIII]2(C2S4) (4), respectively. DFT calculations were carried out to elucidate the reaction profiles of complexes 3 and 4.
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Affiliation(s)
- Xianghui Shi
- State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences No. 5625, Renmin Street, Changchun 130022, China.
| | - Thayalan Rajeshkumar
- LPCNO, CNRS & INSA, UPS, Université de Toulouse 135 Avenue de Rangueil, Toulouse 31077, France.
| | - Laurent Maron
- LPCNO, CNRS & INSA, UPS, Université de Toulouse 135 Avenue de Rangueil, Toulouse 31077, France.
| | - Jianhua Cheng
- State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences No. 5625, Renmin Street, Changchun 130022, China. .,University of Science and Technology of China Hefei, Anhui 230026, China
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Westerhausen M, J. M, Görls H. Synthesis and Structure of a New Bulky Hybrid Scorpionate/Cyclopentadienyl Ligand and its Lithium Complex. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202100385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Jiang W, Zhang L, Zhang L. Reactivity of Mixed Methyl-Aminobenzyl Guanidinate Lutetium Complex towards iPrN=C=N iPr, CS 2 and Ph 2PH. Dalton Trans 2022; 51:12650-12660. [DOI: 10.1039/d2dt02008d] [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
A heteroleptic terminal alkyl lutetium complex stabilized by a bulky guanidinato ligand, LLu(CH2C6H4NMe2-o)(Me)(THF) (1) (L = (PhCH2)2NC(NC6H3iPr2-2,6)2) has been synthesized by treatment of LLu(CH2C6H4NMe2-o)2 with AlMe3 (1 equiv) via an...
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