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Rina YA, Schmidt JAR. Alpha-metalated N, N-dimethylbenzylamine rare-earth metal complexes and their catalytic applications. Dalton Trans 2024. [PMID: 38757291 DOI: 10.1039/d4dt00826j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
This perspective summarizes our group's extensive research in the realm of organometallic lanthanide complexes, while also placing the catalytic reactions supported by these species within the context of known lanthanide catalysis worldwide, with a specific focus on phosphorus-based catalytic reactions such as intermolecular hydrophosphination and hydrophosphinylation. α-Metalated N,N-dimethylbenzylamine ligands have been utilized to generate homoleptic lanthanide complexes, which have subsequently proven to be highly active lanthanum-based catalysts. The main goal of our research program has been to enhance the catalytic efficiency of lanthanum-based complexes, which began with initial successes in the stoichiometric synthesis of organometallic lanthanide complexes and utilization of these species in catalytic hydrophosphination reactions. Not only have these species supported traditional lanthanide catalysis, such as the hydrophosphination of heterocumulenes like carbodiimides, isocyanates, and isothiocyanates, but they have also been effective for a plethora of catalytic reactions tested thus far, including the hydrophosphinylation and hydrophosphorylation of nitriles, hydrophosphination and hydrophosphinylation of alkynes and alkenes, and the heterodehydrocoupling of silanes and amines. Each of these catalytic transformations is meritorious in its own right, offering new synthetic routes to generate organic scaffolds with enhanced functionality while concurrently minimizing both waste generation and energy consumption. Objectives: We aim for the research summary presented herein to inspire and encourage other researchers to investigate f-element based stoichiometric and catalytic reactions. Our efforts in this field began with the recognition that potassium salts of benzyldimethylamine preferred deprotonation at the α-position, rather than the ortho-position, and we wondered if this regiochemistry would be retained in the formation of lanthanide complexes. The pursuit of this simple idea led first to a series of structurally fascinating homoleptic organometallic lanthanide complexes with surprisingly good stability. Fundamental studies of the protonolysis chemistry of these complexes ultimately revealed highly versatile lanthanide-based precatalysts that have propelled a catalytic investigation spanning more than a decade. We anticipate that this summative perspective will animate the synthetic as well as biological communities to consider La(DMBA)3-based catalytic methods in the synthesis of functionalized organic scaffolds as an atom-economic, convenient, and efficient methodology. Ultimately, we envision our work making a positive impact on the advancement of novel chemical transformations and contributing to progress in various fields of science and technology.
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Affiliation(s)
- Yesmin Akter Rina
- Department of Chemistry & Biochemistry, School of Green Chemistry and Engineering, College of Natural Sciences and Mathematics, The University of Toledo, 2801 W. Bancroft St. MS 602, Toledo, Ohio 43606-3390, USA.
| | - Joseph A R Schmidt
- Department of Chemistry & Biochemistry, School of Green Chemistry and Engineering, College of Natural Sciences and Mathematics, The University of Toledo, 2801 W. Bancroft St. MS 602, Toledo, Ohio 43606-3390, USA.
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2
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Qiao X, Zhang Y, Wang L, Zhou S, Pang X. Simple preparation of lignosulfonate stabilized eutectic gallium/indium liquid metal nanodroplets through ball milling process. Int J Biol Macromol 2024; 254:127809. [PMID: 37926321 DOI: 10.1016/j.ijbiomac.2023.127809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/27/2023] [Accepted: 10/30/2023] [Indexed: 11/07/2023]
Abstract
The combination of biomass and liquid metal (LM) makes the preparation process "greener" and application of LM composite materials more sustainable. Here we reported the solvent free preparation of lignosulfonate (LS) stabilized eutectic gallium/indium (EGaIn) LM nanodroplets through ball milling (BM), which was recognized to be efficient and environmentally-friendly alternatives to solution-based methods. By regulating the BM frequency and milling time, uniform LM nanodroplets with a size <200 nm can be achieved. Moreover, the surface of the EGaIn nanodroplets was covered by LS molecules, owing to the hydrogen bond formed between Ga2O3 and LS. Hydrophilic LS shell endowed the LS@EGaIn nanodroplets excellent colloidal stability in the aqueous media. The elongation at break and fracture strength of hydrogel with the addition of LS@EGaIn significantly improved with the addition of LS@EGaIn. Besides, the conductivity and excellent stress responsibility of the LS@EGaIn composite hydrogel illustrated its potential application as s a stress sensor, flexible wearable devices and other related applications. Moreover, it was predicted that LS can be replaced by other synthesized or biological macromolecules, and induced the formation of types of LM based composite materials through such a simple method.
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Affiliation(s)
- Xiaoguang Qiao
- College of Materials Engineering, Henan International Joint Laboratory of Rare Earth Composite Materials, Henan Engineering Technology Research Center for Fiber Preparation and Modification, Henan University of Engineering, Zhengzhou 451191, China; Henan Joint International Research Laboratory of Living Polymerizations and Functional Nanomaterials, Henan Key Laboratory of Advanced Nylon Materials and Application, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
| | - Yuhan Zhang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Joint International Research Laboratory of Living Polymerizations and Functional Nanomaterials, Henan Key Laboratory of Advanced Nylon Materials and Application, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Linan Wang
- Henan Joint International Research Laboratory of Living Polymerizations and Functional Nanomaterials, Henan Key Laboratory of Advanced Nylon Materials and Application, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Shuzhen Zhou
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China.
| | - Xinchang Pang
- Henan Joint International Research Laboratory of Living Polymerizations and Functional Nanomaterials, Henan Key Laboratory of Advanced Nylon Materials and Application, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
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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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New cerium-loaded phosphine oxide-functionalized polyurethane foam materials – Synthesis, stability, comparison of coordination behavior and catalytic applications. REACT FUNCT POLYM 2021. [DOI: 10.1016/j.reactfunctpolym.2021.105070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Mahmudov KT, Huseynov FE, Aliyeva VA, Guedes da Silva MFC, Pombeiro AJL. Noncovalent Interactions at Lanthanide Complexes. Chemistry 2021; 27:14370-14389. [PMID: 34363268 DOI: 10.1002/chem.202102245] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Indexed: 11/10/2022]
Abstract
Lanthanide complexes have attracted a widespread attention due to their structural diversity, as well as multifunctional and tunable properties. The development of lanthanide based functional materials has often relied on the design of the secondary coordination sphere of the corresponding lanthanide complexes. For instance, usually simple lanthanide salts (solvento complexes) do not catalyze effectively organic reactions or provide low yield of the expected product, whereas the presence of a suitable organic ligand with a noncovalent bond donor or acceptor centre (secondary coordination sphere) modifies the symmetry around the metal centre in lanthanide complexes which then successfully can act as catalysts in both homogenous and heterogenous catalysis. In this minireview, we discuss several relevant examples, based on X-ray crystal structure analyses, in which the hydrogen, halogen, chalcogen, pnictogen, tetrel and rare-earth bonds, as well as cation-π, anion-π, lone pair-π, π-π and pancake interactions, are used as a synthon in the decoration of the secondary coordination sphere of lanthanide complexes.
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Affiliation(s)
- Kamran T Mahmudov
- University of Lisbon Higher Technical Institute: Universidade de Lisboa Instituto Superior Tecnico, CQE, R., 1009 - 001, Lisbon, PORTUGAL
| | - Fatali E Huseynov
- Baku State University, Department of Ecology and Soil Sciences, AZERBAIJAN
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Martínez J, de la Cruz-Martínez F, Martínez de Sarasa Buchaca M, Fernández-Baeza J, Sánchez-Barba LF, North M, Castro-Osma JA, Lara-Sánchez A. Efficient Synthesis of Cyclic Carbonates from Unsaturated Acids and Carbon Dioxide and their Application in the Synthesis of Biobased Polyurethanes. Chempluschem 2021; 86:460-468. [PMID: 33704907 DOI: 10.1002/cplu.202100079] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/01/2021] [Indexed: 11/05/2022]
Abstract
Bio-derived furan- and diacid-derived cyclic carbonates have been synthesized in high yields from terminal epoxides and CO2 . Furthermore, four highly substituted terpene-derived cyclic carbonates were isolated in good yields with excellent diastereoselectivity in some cases. Eleven new cyclic carbonates derived from 10-undecenoic acid under mild reaction conditions were prepared, providing the corresponding carbonate products in excellent yields. The catalyst system also performed the conversion of an epoxidized fatty acid n-pentyl ester into a cyclic carbonate under relatively mild reaction conditions (80 °C, 20 bar, 24 h). This bis(cyclic carbonate) was obtained in high yields and with different cis/trans ratios depending on the co-catalyst used. An allyl alcohol by-product was only observed as a minor product when bis(triphenylphosphine)iminium chloride was used as co-catalyst. Finally, two cyclic carbonates were used as building blocks for the preparation of non-isocyanate poly(hydroxy)urethanes by reaction with 1,4-diaminobutane.
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Affiliation(s)
- Javier Martínez
- Instituto de Ciencias Químicas, Facultad de Ciencias, Isla Teja, Universidad Austral de Chile, 5090000, Valdivia, Chile
| | - Felipe de la Cruz-Martínez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Marc Martínez de Sarasa Buchaca
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Juan Fernández-Baeza
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Luis F Sánchez-Barba
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, Madrid, 28933, Spain
| | - Michael North
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - José A Castro-Osma
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Agustín Lara-Sánchez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
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7
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Apostolidis C, Kovács A, Walter O, Colineau E, Griveau J, Morgenstern A, Rebizant J, Caciuffo R, Panak PJ, Rabung T, Schimmelpfennig B, Perfetti M. Tris-{hydridotris(1-pyrazolyl)borato}actinide Complexes: Synthesis, Spectroscopy, Crystal Structure, Bonding Properties and Magnetic Behaviour. Chemistry 2020; 26:11293-11306. [PMID: 32519790 PMCID: PMC7497007 DOI: 10.1002/chem.202001095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/26/2020] [Indexed: 01/10/2023]
Abstract
The isostructural compounds of the trivalent actinides uranium, neptunium, plutonium, americium, and curium with the hydridotris(1-pyrazolyl)borato (Tp) ligand An[η3 -HB(N2 C3 H3 )3 ]3 (AnTp3 ) have been obtained through several synthetic routes. Structural, spectroscopic (absorption, infrared, laser fluorescence) and magnetic characterisation of the compounds were performed in combination with crystal field, density functional theory (DFT) and relativistic multiconfigurational calculations. The covalent bonding interactions were analysed in terms of the natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) models.
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Affiliation(s)
| | - Attila Kovács
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Olaf Walter
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Eric Colineau
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | | | - Alfred Morgenstern
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Jean Rebizant
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Roberto Caciuffo
- European Commission, Joint Research CentrePostfach 234076125KarlsruheGermany
| | - Petra J. Panak
- Institut für Nukleare EntsorgungForschungszentrum KarlsruhePostfach 364076021KarlsruheGermany
| | - Thomas Rabung
- Institut für Nukleare EntsorgungForschungszentrum KarlsruhePostfach 364076021KarlsruheGermany
| | - Bernd Schimmelpfennig
- Institut für Nukleare EntsorgungForschungszentrum KarlsruhePostfach 364076021KarlsruheGermany
| | - Mauro Perfetti
- Department of ChemistryUniversity of CopenhagenUniversitetsparken 52100CopenhagenDenmark
- Department of Chemistry “Ugo Schiff” and INSTM Research UnitUniversity of FlorenceVia della Lastruccia 350019Sesto FiorentinoItaly
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8
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Cho HY, Bielawski CW. Atom Transfer Radical Polymerization in the Solid-State. Angew Chem Int Ed Engl 2020; 59:13929-13935. [PMID: 32419353 PMCID: PMC7496184 DOI: 10.1002/anie.202005021] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Indexed: 12/31/2022]
Abstract
Poly(2-vinylnaphthalene) was synthesized in the solid-state by ball milling a mixture of the corresponding monomer, a Cu-based catalyst, and an activated haloalkane as the polymerization initiator. Various reaction conditions, including milling time, milling frequency and added reductant to accelerate the polymerization were optimized. Monomer conversion and the evolution of polymer molecular weight were monitored over time using 1 H NMR spectroscopy and size exclusion chromatography, respectively, and linear correlations were observed. While the polymer molecular weight was effectively tuned by changing the initial monomer-to-initiator ratio, the experimentally measured values were found to be lower than their theoretical values. The difference was attributed to premature mechanical decomposition and modeled to accurately account for the decrement. Random copolymers of two monomers with orthogonal solubilities, sodium styrene sulfonate and 2-vinylnaphthalene, were also synthesized in the solid-state. Inspection of the data revealed that the solid-state polymerization reaction was controlled, followed a mechanism similar to that described for solution-state atom transfer radical polymerizations, and may be used to prepare polymers that are inaccessible via solution-state methods.
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Affiliation(s)
- Hong Y. Cho
- Center for Multidimensional Carbon Materials (CMCM)Institute for Basic Science (IBS)Ulsan44919Republic of Korea
| | - Christopher W. Bielawski
- Center for Multidimensional Carbon Materials (CMCM)Institute for Basic Science (IBS)Ulsan44919Republic of Korea
- Department of ChemistryUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
- Department of Energy EngineeringUlsan National Institute of Science and Technology (UNIST)Ulsan44919Republic of Korea
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9
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Paprocki V, Hrobárik P, Harriman KLM, Luff MS, Kupfer T, Kaupp M, Murugesu M, Braunschweig H. Ein neutrales 1,4‐Diborabenzol als π‐Ligand in Actinoidkomplexen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004501] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Valerie Paprocki
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with Boron Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Peter Hrobárik
- Institut für Chemie Theoretische Chemie/Quantenchemie, Sekr. C7 Technische Universität Berlin Straße des 17. Juni 135 10623 Berlin Deutschland
- Department of Inorganic Chemistry Faculty of Natural Sciences Comenius University 84215 Bratislava Slowakei
| | - Katie L. M. Harriman
- Department of Chemistry and Biomolecular Sciences University of Ottawa 10 Marie Curie Ottawa Ontario K1N 6N5 Kanada
| | - Martin S. Luff
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with Boron Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Thomas Kupfer
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with Boron Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Martin Kaupp
- Institut für Chemie Theoretische Chemie/Quantenchemie, Sekr. C7 Technische Universität Berlin Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences University of Ottawa 10 Marie Curie Ottawa Ontario K1N 6N5 Kanada
| | - Holger Braunschweig
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with Boron Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
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Paprocki V, Hrobárik P, Harriman KLM, Luff MS, Kupfer T, Kaupp M, Murugesu M, Braunschweig H. Stable Actinide π Complexes of a Neutral 1,4-Diborabenzene. Angew Chem Int Ed Engl 2020; 59:13109-13115. [PMID: 32329111 PMCID: PMC7496575 DOI: 10.1002/anie.202004501] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Indexed: 11/25/2022]
Abstract
The π coordination of arene and anionic heteroarene ligands is a ubiquitous bonding motif in the organometallic chemistry of d-block and f-block elements. By contrast, related π interactions of neutral heteroarenes including neutral bora-π-aromatics are less prevalent particularly for the f-block, due to less effective metal-to-ligand backbonding. In fact, π complexes with neutral heteroarene ligands are essentially unknown for the actinides. We have now overcome these limitations by exploiting the exceptionally strong π donor capabilities of a neutral 1,4-diborabenzene. A series of remarkably robust, π-coordinated thorium(IV) and uranium(IV) half-sandwich complexes were synthesized by simply combining the bora-π-aromatic with ThCl4 (dme)2 or UCl4 , representing the first examples of actinide complexes with a neutral boracycle as sandwich-type ligand. Experimental and computational studies showed that the strong actinide-heteroarene interactions are predominately electrostatic in nature with distinct ligand-to-metal π donation and without significant π/δ backbonding contributions.
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Affiliation(s)
- Valerie Paprocki
- Institut für Anorganische ChemieJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Peter Hrobárik
- Institut für ChemieTheoretische Chemie/Quantenchemie, Sekr. C7Technische Universität BerlinStraße des 17. Juni 13510623BerlinGermany
- Department of Inorganic ChemistryFaculty of Natural SciencesComenius University84215BratislavaSlovakia
| | - Katie L. M. Harriman
- Department of Chemistry and Biomolecular SciencesUniversity of Ottawa10 Marie CurieOttawaOntarioK1N 6N5Canada
| | - Martin S. Luff
- Institut für Anorganische ChemieJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Thomas Kupfer
- Institut für Anorganische ChemieJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Martin Kaupp
- Institut für ChemieTheoretische Chemie/Quantenchemie, Sekr. C7Technische Universität BerlinStraße des 17. Juni 13510623BerlinGermany
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular SciencesUniversity of Ottawa10 Marie CurieOttawaOntarioK1N 6N5Canada
| | - Holger Braunschweig
- Institut für Anorganische ChemieJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
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Affiliation(s)
- Josef T. Boronski
- Department of Chemistry; The University of Manchester; Oxford Road M13 9PL Manchester UK
| | - Stephen T. Liddle
- Department of Chemistry; The University of Manchester; Oxford Road M13 9PL Manchester UK
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Boronski JT, Wooles AJ, Liddle ST. Heteroleptic actinocenes: a thorium(iv)-cyclobutadienyl-cyclooctatetraenyl-di-potassium-cyclooctatetraenyl complex. Chem Sci 2020; 11:6789-6794. [PMID: 34094128 PMCID: PMC8159314 DOI: 10.1039/d0sc02479a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 06/10/2020] [Indexed: 11/21/2022] Open
Abstract
Despite the vast array of η n -carbocyclic C5-8 complexes reported for actinides, cyclobutadienyl (C4) remain exceedingly rare, being restricted to six uranium examples. Here, overcoming the inherent challenges of installing highly reducing C4-ligands onto actinides when using polar starting materials such as halides, we report that reaction of [Th(η8-C8H8)2] with [K2{C4(SiMe3)4}] gives [{Th(η4-C4[SiMe3]4)(μ-η8-C8H8)(μ-η2-C8H8)(K[C6H5Me]2)}2{K(C6H5Me)}{K}] (1), a new type of heteroleptic actinocene. Quantum chemical calculations suggest that the thorium ion engages in π- and δ-bonding to the η4-cyclobutadienyl and η8-cyclooctatetraenyl ligands, respectively. Furthermore, the coordination sphere of this bent thorocene analogue is supplemented by an η2-cyclooctatetraenyl interaction, which calculations suggest is composed of σ- and π-symmetry donations from in-plane in- and out-of-phase C[double bond, length as m-dash]C 2p-orbital combinations to vacant thorium 6d orbitals. The characterisation data are consistent with this being a metal-alkene-type interaction that is integral to the bent structure and stability of this complex.
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Affiliation(s)
- Josef T Boronski
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Ashley J Wooles
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Stephen T Liddle
- Department of Chemistry, The University of Manchester Oxford Road Manchester M13 9PL UK
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13
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Cho HY, Bielawski CW. Atom Transfer Radical Polymerization in the Solid‐State. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hong Y. Cho
- Center for Multidimensional Carbon Materials (CMCM) Institute for Basic Science (IBS) Ulsan 44919 Republic of Korea
| | - Christopher W. Bielawski
- Center for Multidimensional Carbon Materials (CMCM) Institute for Basic Science (IBS) Ulsan 44919 Republic of Korea
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea
- Department of Energy Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Republic of Korea
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14
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Boronski JT, Doyle LR, Wooles AJ, Seed JA, Liddle ST. Synthesis and Characterization of an Oxo-Centered Homotrimetallic Uranium(IV)–Cyclobutadienyl Dianion Complex. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00104] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Josef T. Boronski
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Laurence R. Doyle
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Ashley J. Wooles
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - John A. Seed
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Stephen T. Liddle
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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15
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Chen SM, Zhang YQ, Xiong J, Wang BW, Gao S. Adducts of Tris(alkyl) Holmium(III) Showing Magnetic Relaxation. Inorg Chem 2020; 59:5835-5844. [DOI: 10.1021/acs.inorgchem.9b03264] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shi-Ming Chen
- Beijing National Laboratory of Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, People’s Republic of China
| | - Jin Xiong
- Beijing National Laboratory of Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Bing-Wu Wang
- Beijing National Laboratory of Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Song Gao
- Beijing National Laboratory of Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
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16
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Boronski JT, Doyle LR, Seed JA, Wooles AJ, Liddle ST. f-Element Half-Sandwich Complexes: A Tetrasilylcyclobutadienyl-Uranium(IV)-Tris(tetrahydroborate) Anion Pianostool Complex. Angew Chem Int Ed Engl 2019; 59:295-299. [PMID: 31724808 DOI: 10.1002/anie.201913640] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/11/2019] [Indexed: 12/26/2022]
Abstract
Despite there being numerous examples of f-element compounds supported by cyclopentadienyl, arene, cycloheptatrienyl, and cyclooctatetraenyl ligands (C5-8 ), cyclobutadienyl (C4 ) complexes remain exceedingly rare. Here, we report that reaction of [Li2 {C4 (SiMe3 )4 }(THF)2 ] (1) with [U(BH4 )3 (THF)2 ] (2) gives the pianostool complex [U{C4 (SiMe3 )4 }(BH4 )3 ][Li(THF)4 ] (3), where use of a borohydride and preformed C4 -unit circumvents difficulties in product isolation and closing a C4 -ring at uranium. Complex 3 is an unprecedented example of an f-element half-sandwich cyclobutadienyl complex, and it is only the second example of an actinide-cyclobutadienyl complex, the other being an inverse-sandwich. The U-C distances are short (av. 2.513 Å), reflecting the formal 2- charge of the C4 -unit, and the SiMe3 groups are displaced from the C4 -plane, which we propose maximises U-C4 orbital overlap. DFT calculations identify two quasi-degenerate U-C4 π-bonds utilising the ψ2 and ψ3 molecular orbitals of the C4 -unit, but the potential δ-bond using the ψ4 orbital is vacant.
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Affiliation(s)
- Josef T Boronski
- Department of Chemistry and Centre for Radiochemistry Research, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Laurence R Doyle
- Department of Chemistry and Centre for Radiochemistry Research, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - John A Seed
- Department of Chemistry and Centre for Radiochemistry Research, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Ashley J Wooles
- Department of Chemistry and Centre for Radiochemistry Research, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Stephen T Liddle
- Department of Chemistry and Centre for Radiochemistry Research, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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17
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Boronski JT, Doyle LR, Seed JA, Wooles AJ, Liddle ST. f‐Element Half‐Sandwich Complexes: A Tetrasilylcyclobutadienyl–Uranium(IV)–Tris(tetrahydroborate) Anion Pianostool Complex. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201913640] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Josef T. Boronski
- Department of Chemistry and Centre for Radiochemistry Research The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Laurence R. Doyle
- Department of Chemistry and Centre for Radiochemistry Research The University of Manchester Oxford Road Manchester M13 9PL UK
| | - John A. Seed
- Department of Chemistry and Centre for Radiochemistry Research The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Ashley J. Wooles
- Department of Chemistry and Centre for Radiochemistry Research The University of Manchester Oxford Road Manchester M13 9PL UK
| | - Stephen T. Liddle
- Department of Chemistry and Centre for Radiochemistry Research The University of Manchester Oxford Road Manchester M13 9PL UK
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18
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Abstract
Recent developments and results from the organometallic chemistry of the actinides are reviewed. In the last one and a half years the structural data of about 15 organometallic complexes of transuranium actinides (Np or Pu) have been published, all involving π-ligands in the coordination sphere of the metal ion. On the basis of these data, a comparison of these molecules is presented. Depending on the steric demands of the ligands, effects like the actinide contraction seem to be stronger or weaker in the structural features. This indicates that the interplay between the actinide ion and the π-ligand is rather flexible, enabling the formation of stable bonds over a broad range of actinide ion oxidation states.
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Affiliation(s)
- Olaf Walter
- European Commission–Joint Research CentreDirectorate for Nuclear Safety and Security–G. I. 5Postfach 234076125KarlsruheGermany
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19
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Li Y, Chen X, Gong Y. Synthesis of a dinuclear europium( iii) complex through deprotonation and oxygen-atom transfer of trimethylamine N-oxide. Dalton Trans 2019; 48:17158-17162. [DOI: 10.1039/c9dt04234b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A dinuclear europium complex was synthesized via unprecedented deprotonation and oxygen-atom transfer of Me3NO.
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Affiliation(s)
- Yangjuan Li
- Department of Radiochemistry
- Shanghai Institute of Applied Physics
- Chinese Academy of Sciences
- Shanghai
- China
| | - Xiuting Chen
- Department of Radiochemistry
- Shanghai Institute of Applied Physics
- Chinese Academy of Sciences
- Shanghai
- China
| | - Yu Gong
- Department of Radiochemistry
- Shanghai Institute of Applied Physics
- Chinese Academy of Sciences
- Shanghai
- China
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20
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2016. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2017.09.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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21
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Yan X, Zhang S, Peng D, Zhang P, Zhi J, Wu X, Wang L, Dong Y, Li X. Cationic half-sandwich rare-earth metal alkyl species catalyzed polymerization and copolymerization of aryl isocyanides possessing polar, bulky, or chiral substituents. Polym Chem 2018. [DOI: 10.1039/c8py00007g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cationic half-sandwich rare-earth metal alkyl species were first used for the coordination–insertion polymerization and copolymerization of aryl isocyanides.
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Affiliation(s)
- Xinwen Yan
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
| | - Shaowen Zhang
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
| | - Deqian Peng
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
| | - Pengfei Zhang
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
| | - Junge Zhi
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
| | - Xiaolu Wu
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
| | - Lin Wang
- School of Mechatronical Engineering
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Yuping Dong
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications
- School of Materials Science and Engineering
- Beijing Institute of Technology
- Beijing 100081
- China
| | - Xiaofang Li
- Key Laboratory of Cluster Science of Ministry of Education
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
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22
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Cis-1,4-Polymerization of Isoprene by 1,3-Bis(oxazolinymethylidene)isoindoline-Ligated Rare-Earth Metal Dialkyl Complexes. Polymers (Basel) 2017; 9:polym9100531. [PMID: 30965837 PMCID: PMC6419008 DOI: 10.3390/polym9100531] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 10/17/2017] [Accepted: 10/18/2017] [Indexed: 12/23/2022] Open
Abstract
A series of novel chiral nonmetallocene pincer-type rare-earth metal dialkyl complexes bearing the chiral monoanionic tridentate C₂-symmetric 1,3-bis(oxazolinymethylidene)isoindoline (BOXMI-H) ligand (BOXMI)Ln(CH₂SiMe₃)₂ 1⁻3 (1: Ln = Sc, yield = 57%; 2: Ln = Lu, yield = 55%; 3: Ln = Y, yield = 62%) have been prepared in moderate yields via the acid-base reaction between the BOXMI ligand and rare-earth metal tri(trimethylsilylmethyl) complexes. The X-ray diffractions show that both of the complexes 1 and 2 contain one BOXMI ligand and two trimethylsilylmethyl ligands, adopting a distorted trigonal bipyramidal configuration. In the presence of a cocatalyst such as borate and AlR₃, these complexes 1⁻3 exhibit high activities of up to 6.8 × 10⁴ (g of polymer)/(molLn h) and high cis-1,4 selectivities of up to 97% in the polymerization of isoprene in toluene, yielding the cis-1,4-polyisoprenes with heavy molecular weights (Mn of up to 710,000 g/mol) and bimodal molecular weight distributions (Mw/Mn = 2.0⁻4.5).
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23
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Abstract
Fifty years have passed since the foundation of organometallic neptunium chemistry, and yet only a handful of complexes have been reported, and even fewer have been fully characterized. Yet, increasingly, combined synthetic/spectroscopic/computational studies are demonstrating how covalently bonding, soft, carbocyclic organometallic ligands provide an excellent platform for advancing the fundamental understanding of the differences in orbital contributions and covalency in f-block metal-ligand bonding. Understanding the subtleties is the key to the safe handling and separations of the highly radioactive nuclei. This review describes the complexes that have been synthesized to date and presents a critical assessment of the successes and difficulties in their analysis and the bonding information they have provided. Because of increasing recent efforts to start new Np-capable air-sensitive inorganic chemistry laboratories, the importance of radioactivity, the basics of Np decay and its ramifications (including the radiochemical synthesis of one organometallic compound), and the available anhydrous starting materials are also surveyed. The review also highlights a range of instances in which important differences in the chemical behavior between Np and its closest neighbors, uranium and plutonium, are found.
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Affiliation(s)
- Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh , The King's Buildings, Edinburgh, EH9 3FJ, U.K
| | - Michał S Dutkiewicz
- EaStCHEM School of Chemistry, University of Edinburgh , The King's Buildings, Edinburgh, EH9 3FJ, U.K.,European Commission, DG Joint Research Centre, Directorate G-Nuclear Safety and Security, Advanced Nuclear Knowledge-G.I.5, Postfach 2340, D-76125, Karlsruhe, Germany
| | - Olaf Walter
- European Commission, DG Joint Research Centre, Directorate G-Nuclear Safety and Security, Advanced Nuclear Knowledge-G.I.5, Postfach 2340, D-76125, Karlsruhe, Germany
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24
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Martínez J, Fernández-Baeza J, Sánchez-Barba LF, Castro-Osma JA, Lara-Sánchez A, Otero A. An Efficient and Versatile Lanthanum Heteroscorpionate Catalyst for Carbon Dioxide Fixation into Cyclic Carbonates. CHEMSUSCHEM 2017; 10:2886-2890. [PMID: 28598575 DOI: 10.1002/cssc.201700898] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 06/07/2017] [Indexed: 06/07/2023]
Abstract
A new lanthanum heteroscorpionate complex has shown exceptional catalytic activity for the synthesis of cyclic carbonates from epoxides and carbon dioxide. This catalyst system also promotes the reaction of bio-based epoxides to give an important class of bis(cyclic carbonates) that can be further used for the production of bio-derived non-isocyanate polyurethanes. The catalytic process requires low catalyst loading and mild reaction conditions for the synthesis of a wide range of cyclic carbonates.
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Affiliation(s)
- Javier Martínez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, 13071-, Ciudad Real, Spain
| | - Juan Fernández-Baeza
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, 13071-, Ciudad Real, Spain
| | - Luis F Sánchez-Barba
- Universidad Rey Juan Carlos, Departamento de Biología y Geología, Física y Química Inorgánica, Móstoles, 28933, Madrid, Spain
| | - José A Castro-Osma
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Farmacia, 02071-, Albacete, Spain
| | - Agustín Lara-Sánchez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, 13071-, Ciudad Real, Spain
| | - Antonio Otero
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, 13071-, Ciudad Real, Spain
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25
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Zhang P, Liao H, Wang H, Li X, Yang F, Zhang S. Cis-1,4-Polymerization of Isoprene Catalyzed by 1,3-Bis(2-pyridylimino)isoindoline-Ligated Rare-Earth-Metal Dialkyl Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00322] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pengfei Zhang
- School
of Chemistry and Chemical Engineering, Key Laboratory of Cluster Science
of Ministry of Education, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, People’s Republic of China
| | - Hongyun Liao
- School
of Chemistry and Chemical Engineering, Key Laboratory of Cluster Science
of Ministry of Education, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, People’s Republic of China
| | - Hanghang Wang
- School
of Chemistry and Chemical Engineering, Key Laboratory of Cluster Science
of Ministry of Education, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, People’s Republic of China
| | - Xiaofang Li
- School
of Chemistry and Chemical Engineering, Key Laboratory of Cluster Science
of Ministry of Education, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, People’s Republic of China
| | - Fanzhi Yang
- Advanced
Research Institute for Multidisciplinary Science, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, People’s Republic of China
| | - Shaowen Zhang
- School
of Chemistry and Chemical Engineering, Key Laboratory of Cluster Science
of Ministry of Education, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, People’s Republic of China
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26
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27
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28
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Kawasaki K, Sugiyama R, Tsuji T, Iwasa T, Tsunoyama H, Mizuhata Y, Tokitoh N, Nakajima A. A designer ligand field for blue-green luminescence of organoeuropium(ii) sandwich complexes with cyclononatetraenyl ligands. Chem Commun (Camb) 2017; 53:6557-6560. [PMID: 28524187 DOI: 10.1039/c7cc03045b] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel η9-coordinated double-decker sandwich complex of divalent europium is synthesized. The complex exhibits blue-green photoluminescence at 516 nm, which is significantly blue-shifted from those of other organoeuropium(ii) sandwich complexes (∼630 nm). The blue-shift was quantitatively explained by the weakened electrostatic field of the expanded 10-π ring.
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Affiliation(s)
- Kenshiro Kawasaki
- Department of Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
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29
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Yang F, Li X. Novel cationic rare earth metal alkyl catalysts for precise olefin polymerization. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28617] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Fanzhi Yang
- Advanced Research Institute for Multidisciplinary Science, Beijing Institute of Technology; Haidian Beijing 100081 China
| | - Xiaofang Li
- School of Chemistry and Chemical Engineering, Key Laboratory of Cluster Science of Ministry of Education; Beijing Institute of Technology; Haidian Beijing 100081 China
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30
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Abstract
The synthesis of tetrabenzo[a,c,g,i]fluorenyl (Tbf) yttrium dialkyl complexes, (Tbf)Y(CH2SiMe3)2(L) (L = tetrahydrofuran (THF), 1; L = bipy, 2), by direct protonolysis of the tris(alkyl) complex, Y(CH2SiMe3)3(THF)2, are reported. The X-ray crystal structures of 1 and 2 display the helical twisting typically observed for the Tbf ligand. Dynamic nuclear magnetic resonance (NMR) studies on 1 show a barrier to Tbf helical inversion (epimerization or “wagging”) of 38.1 ± 0.5 kJ mol−1. The reaction of 1 with acidic hydrocarbons such as 1,3-bis(trimethylsilyl)cyclopentadiene or trimethylsilylacetylene results in protonolysis to form the mixed Cp derivative [(Tbf){C5H3(SiMe3)2}Y(CH2SiMe3)(THF)] (3) or [(Tbf)Y(CCSiMe3)2(THF)]n (4), respectively. In the case of 4, a small amount of the trinuclear cluster (Tbf)Y3(μ3-CCSiMe3)2(μ2-CCSiMe3)3(CCSiMe3)3(THF)2 (5) was isolated and characterized by X-ray crystallography. Dialkyl 1 undergoes smooth insertion of trimethylsilyl isocyanate to afford [(Tbf)Y{κ2-(N,O)-Me3SiN(Me3SiCH2)CO}2(THF)] (6) but it does not react with alkenes. Treating 1 with [Ph3C]+[B(C6F5)4]− in bromobenzene generates a moderately active ethylene polymerization catalyst (36 kg mol−1 h−1 bar−1).
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Affiliation(s)
- Jianlong Sun
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC V8W 3V6, Canada
| | - David J. Berg
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC V8W 3V6, Canada
| | - Brendan Twamley
- University Research Office, 109 Morrill Hall, University of Idaho, Moscow, ID 83844-3010, USA
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31
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Pushkarevsky NA, Ilyin IY, Petrov PA, Samsonenko DG, Ryzhikov MR, Roesky PW, Konchenko SN. Different Reductive Reactivities of SmCpx2(THF)n (Cpx = C5Me5 and C5H3tBu2) Samarocenes toward P2Ph4: THF Ring-Opening and Ligand-Exchange Pathways. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nikolay A. Pushkarevsky
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentieva Avenue 3, 630090 Novosibirsk, Russia
- Novosibirsk State University, Department of Natural
Sciences, Pirogova Street
2, 630090 Novosibirsk, Russia
| | - Igor Yu. Ilyin
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentieva Avenue 3, 630090 Novosibirsk, Russia
| | - Pavel A. Petrov
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentieva Avenue 3, 630090 Novosibirsk, Russia
- Novosibirsk State University, Department of Natural
Sciences, Pirogova Street
2, 630090 Novosibirsk, Russia
| | - Denis G. Samsonenko
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentieva Avenue 3, 630090 Novosibirsk, Russia
- Novosibirsk State University, Department of Natural
Sciences, Pirogova Street
2, 630090 Novosibirsk, Russia
| | - Maxim R. Ryzhikov
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentieva Avenue 3, 630090 Novosibirsk, Russia
- Novosibirsk State University, Department of Natural
Sciences, Pirogova Street
2, 630090 Novosibirsk, Russia
| | - Peter W. Roesky
- Institute
of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Sergey N. Konchenko
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentieva Avenue 3, 630090 Novosibirsk, Russia
- Novosibirsk State University, Department of Natural
Sciences, Pirogova Street
2, 630090 Novosibirsk, Russia
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32
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Singh SK, Pandey B, Velmurugan G, Rajaraman G. Key role of higher order symmetry and electrostatic ligand field design in the magnetic relaxation of low-coordinate Er(iii) complexes. Dalton Trans 2017; 46:11913-11924. [DOI: 10.1039/c6dt03568j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Our theoretical analysis highlights that both symmetry and a suitable ligand field is required to obtain large barrier heights in SIMs. Key role of Lanthanide–halogen covalency in enhancing Ueff is discussed.
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Affiliation(s)
- Saurabh Kumar Singh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
- Department of Molecular Theory and Spectroscopy
| | - Bhawana Pandey
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
| | | | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
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33
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Liu H, Ghatak T, Eisen MS. Organoactinides in catalytic transformations: scope, mechanisms and Quo Vadis. Chem Commun (Camb) 2017; 53:11278-11297. [DOI: 10.1039/c7cc04415a] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The last decade has witnessed brilliant and remarkable advances in the chemistry of the early actinides in stoichiometric and in challenging catalytic processes. This canvas of knowledge allows the design of chemical reactivities reaching a high level of sophistication. This review highlights the latest results obtained since 2008 on those catalytic processes.
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Affiliation(s)
- Heng Liu
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Technion
- Israel
| | - Tapas Ghatak
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Technion
- Israel
| | - Moris S. Eisen
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Technion
- Israel
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34
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Regio- and Stereochemical Control in Ocimene Polymerization by Half-Sandwich Rare-Earth Metal Dialkyl Complexes. Macromol Rapid Commun 2016; 37:987-92. [DOI: 10.1002/marc.201600102] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 03/16/2016] [Indexed: 11/07/2022]
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35
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Shi L, Su Q, Chen J, Li X, Luo Y. Rare-earth metal bis(silylamide) complexes supported by mono-dentate arylamido ligand: synthesis, reactivity, and catalyst precursors in living cis-1,4-selective polymerization of isoprene. Dalton Trans 2016; 45:1391-7. [DOI: 10.1039/c5dt03937a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
One-pot salt metathesis reaction of LnCl3, [2,6-iPr2C6H3N(SiMe3)]Li and LiN(SiHMe2)2 in 1 : 1 : 2 molar ratio gave [2,6-iPr2C6H3N(SiMe3)]Ln[N(SiHMe2)2]2(THF) (Ln = Y, Lu, La), which were highly active for cis-1,4 polymerization of isoprene in the presence of [Ph3C][B(C6F5)4] and AliBu3.
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Affiliation(s)
- Liqin Shi
- Ningbo Polytechnic
- Ningbo 315800
- P. R. China
- Zhejiang University of Technology
- Hangzhou 310032
| | - Qi Su
- Organometallic Chemistry Laboratory
- Ningbo Institute of Technology
- Zhejiang University
- Ningbo 315100
- P. R. China
| | - Jue Chen
- Organometallic Chemistry Laboratory
- Ningbo Institute of Technology
- Zhejiang University
- Ningbo 315100
- P. R. China
| | - Xiaonian Li
- Zhejiang University of Technology
- Hangzhou 310032
- P. R. China
| | - Yunjie Luo
- Organometallic Chemistry Laboratory
- Ningbo Institute of Technology
- Zhejiang University
- Ningbo 315100
- P. R. China
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