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Lyubov DM, Tolpygin AO, Trifonov AA. Rare-earth metal complexes as catalysts for ring-opening polymerization of cyclic esters. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.04.013] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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2
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Plommer H, Murphy JN, Dawe LN, Kerton FM. Morpholine-Stabilized Cationic Aluminum Complexes and Their Reactivity in Ring-Opening Polymerization of ε-Caprolactone. Inorg Chem 2019; 58:5253-5264. [DOI: 10.1021/acs.inorgchem.9b00347] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Hart Plommer
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X7, Canada
| | - Jennifer N. Murphy
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X7, Canada
| | - Louise N. Dawe
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
| | - Francesca M. Kerton
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X7, Canada
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3
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Zhu Y, Yao Z, Xu F. Cationic-lanthanide-complex-catalyzed reaction of 2-hydroxychalcones with naphthols: Facile synthesis of 2,8-dioxabicyclo[3.3.1]nonanes. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.06.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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4
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Gajecki L, Berg DJ, Hoenisch J, Oliver AG. Variable coordination of carbazolyl-bis(tetrazole) ligands in lanthanide chemistry. Dalton Trans 2018; 47:15487-15496. [DOI: 10.1039/c8dt02757a] [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
Lanthanide complexes of 1,8-bis(2′-isopropyltetrazo-5′-yl)-3,6-di-tert-butylcarbazolide adopt geometries that include planar, buckled and tetrazolyl-bridged tridentate, as well as bidentate, bonding modes.
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Affiliation(s)
- Leah Gajecki
- Department of Chemistry
- University of Victoria
- Victoria BC V8W 2Y2
- Canada
| | - David J. Berg
- Department of Chemistry
- University of Victoria
- Victoria BC V8W 2Y2
- Canada
| | - Josh Hoenisch
- Department of Chemistry
- University of Victoria
- Victoria BC V8W 2Y2
- Canada
| | - Allen G. Oliver
- Department of Chemistry & Biochemistry
- University of Notre Dame
- Notre Dame
- USA
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Zhu X, Li G, Xu F, Zhang Y, Xue M, Shen Q. Investigation and mechanistic study into intramolecular hydroalkoxylation of unactivated alkenols catalyzed by cationic lanthanide complexes. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.01.051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Xiong J, Ding HY, Meng YS, Gao C, Zhang XJ, Meng ZS, Zhang YQ, Shi W, Wang BW, Gao S. Hydroxide-bridged five-coordinate Dy III single-molecule magnet exhibiting the record thermal relaxation barrier of magnetization among lanthanide-only dimers. Chem Sci 2016; 8:1288-1294. [PMID: 28451271 PMCID: PMC5359878 DOI: 10.1039/c6sc03621j] [Citation(s) in RCA: 147] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Accepted: 10/01/2016] [Indexed: 12/24/2022] Open
Abstract
A hydroxide-bridged five-coordinate dysprosium(iii) dimer with short Dy–O bonds was synthesized.
A hydroxide-bridged centrosymmetric DyIII dimer with each DyIII being five-coordinated has been synthesized using bulky hindered phenolate ligands. Magnetic studies revealed that this compound exhibits a slow magnetic relaxation of a single-ion origin together with a step-like magnetic hysteresis of the magnetic coupled cluster. The thermal relaxation barrier of magnetization is 721 K in the absence of a static magnetic field, while the intramolecular magnetic interaction is very large among reported 4f-only dimers. CASSCF calculations with a larger active space were performed to understand the electronic structure of the compound. The thermal relaxation regime and the quantum tunneling regime are well separated, representing a good model to study the relaxation mechanism of SMMs with intramolecular Dy–Dy magnetic interactions.
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Affiliation(s)
- Jin Xiong
- Beijing National Laboratory of Molecular Science , College of Chemistry and Molecular Engineering , State Key Laboratory of Rare Earth Materials Chemistry and Applications , Peking University , Beijing , 100871 , P. R. China . ; ; http://www.chem.pku.edu.cn/mmm/
| | - Hai-Yan Ding
- Jiangsu Key Laboratory for NSLSCS , School of Physical Science and Technology , Nanjing Normal University , Nanjing 210023 , P. R. China
| | - Yin-Shan Meng
- Beijing National Laboratory of Molecular Science , College of Chemistry and Molecular Engineering , State Key Laboratory of Rare Earth Materials Chemistry and Applications , Peking University , Beijing , 100871 , P. R. China . ; ; http://www.chem.pku.edu.cn/mmm/
| | - Chen Gao
- Beijing National Laboratory of Molecular Science , College of Chemistry and Molecular Engineering , State Key Laboratory of Rare Earth Materials Chemistry and Applications , Peking University , Beijing , 100871 , P. R. China . ; ; http://www.chem.pku.edu.cn/mmm/
| | - Xue-Jing Zhang
- Department of Chemistry , Key Laboratory of Advanced Energy Materials Chemistry (MOE) , State Key Laboratory of Elemento-Organic Chemistry , Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Nankai University , Tianjin 300071 , China
| | - Zhao-Sha Meng
- Beijing National Laboratory of Molecular Science , College of Chemistry and Molecular Engineering , State Key Laboratory of Rare Earth Materials Chemistry and Applications , Peking University , Beijing , 100871 , P. R. China . ; ; http://www.chem.pku.edu.cn/mmm/
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS , School of Physical Science and Technology , Nanjing Normal University , Nanjing 210023 , P. R. China
| | - Wei Shi
- Department of Chemistry , Key Laboratory of Advanced Energy Materials Chemistry (MOE) , State Key Laboratory of Elemento-Organic Chemistry , Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Nankai University , Tianjin 300071 , China
| | - Bing-Wu Wang
- Beijing National Laboratory of Molecular Science , College of Chemistry and Molecular Engineering , State Key Laboratory of Rare Earth Materials Chemistry and Applications , Peking University , Beijing , 100871 , P. R. China . ; ; http://www.chem.pku.edu.cn/mmm/
| | - Song Gao
- Beijing National Laboratory of Molecular Science , College of Chemistry and Molecular Engineering , State Key Laboratory of Rare Earth Materials Chemistry and Applications , Peking University , Beijing , 100871 , P. R. China . ; ; http://www.chem.pku.edu.cn/mmm/
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7
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Maria L, Soares M, Santos IC, Sousa VR, Mora E, Marçalo J, Luzyanin KV. A novel samarium(ii) complex bearing a dianionic bis(phenolate) cyclam ligand: synthesis, structure and electron-transfer reactions. Dalton Trans 2016; 45:3778-90. [PMID: 26818107 DOI: 10.1039/c5dt04647e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The reaction of the hexadentate dianionic 1,4,8,11-tetraazacyclotetradecane-based bis(phenolate) ligand, (tBu2ArO)2Me2-cyclam(2-), with [SmI2(thf )2] in thf resulted in the formation of the divalent samarium complex [Sm(κ(6)-{(tBu2ArO)2Me2-cyclam})] (1). X-ray diffraction studies revealed that after recrystallization from n-hexane/thf complex 1 has a monomeric structure and does not contain thf molecules coordinated to the Sm(II) center. However, UV-vis and (1)H NMR spectroscopy of 1 evidenced the formation of thf-solvated complexes in neat thf. Reductive studies show that complex 1 can act as a single electrontransfer reagent and form well-defined Sm(III) species. The reaction of 1 with several substrates, namely, TlBPh4, pyridine N-oxide, OPPh3, SPPh3 and bipyridines, are reported. Spectroscopy studies, including NMR, and single crystal X-ray diffraction data are in agreement with the formation of cationic Sm(III) species, monochalcogenide bridged Sm(III) complexes and Sm(III) complexes with bipyridine radical ligand, respectively.
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Affiliation(s)
- Leonor Maria
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
| | - Marina Soares
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal. and Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Isabel C Santos
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
| | - Vânia R Sousa
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
| | - Elsa Mora
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
| | - Joaquim Marçalo
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
| | - Konstantin V Luzyanin
- Institute of Chemistry, Saint Petersburg State University, Universitetsky pr. 26, 198504 Saint Petersburg, Russian Federation and Department of Chemistry, University of Liverpool, Crown Street, L69 7ZD, Liverpool, UK
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8
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Sarazin Y, Carpentier JF. Discrete Cationic Complexes for Ring-Opening Polymerization Catalysis of Cyclic Esters and Epoxides. Chem Rev 2015; 115:3564-614. [DOI: 10.1021/acs.chemrev.5b00033] [Citation(s) in RCA: 211] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yann Sarazin
- Institut des Sciences Chimiques
de Rennes, Organometallics, Materials and Catalysis Laboratories,
UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Jean-François Carpentier
- Institut des Sciences Chimiques
de Rennes, Organometallics, Materials and Catalysis Laboratories,
UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
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Lawan N, Muangpil S, Kungwan N, Meepowpan P, Lee VS, Punyodom W. Tin (IV) alkoxide initiator design for poly (d-lactide) synthesis using DFT calculations. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.07.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Otero A, Fernández-Baeza J, Lara-Sánchez A, Sánchez-Barba LF. Metal complexes with heteroscorpionate ligands based on the bis(pyrazol-1-yl)methane moiety: Catalytic chemistry. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.01.027] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Cheshmedzhieva D, Angelova I, Ilieva S, Georgiev GS, Galabov B. Initiation of ring-opening polymerization of lactide: The effect of metal alkoxide catalyst. COMPUT THEOR CHEM 2012. [DOI: 10.1016/j.comptc.2012.06.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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12
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Li QY, Chen DY, He MH, Yang GW, Shen L, Zhai C, Shen W, Gu K, Zhao JJ. Nd(III) and Dy(III) coordination compounds based on 1H-tetrazolate-5-acetic acid ligands: Synthesis, crystal structures and catalytic properties. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.02.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Sheng H, Shi J, Feng Y, Wang H, Jiao Y, Sheng H, Zhang Y, Shen Q. Remarkable effect of alkali metal on polymerization of cyclic esters catalyzed by samarium–alkali metal multinuclear alkoxide clusters. Dalton Trans 2012; 41:9232-40. [DOI: 10.1039/c2dt30677h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Liu B, Roisnel T, Sarazin Y. Well-defined, solvent-free cationic barium complexes: Synthetic strategies and catalytic activity in the ring-opening polymerization of lactide. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.09.020] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Polymerization of ɛ-caprolactone using ruthenium(II) mixed metallocene catalysts and isopropyl alcohol: Living character and mechanistic study. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.06.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Sarazin Y, Liu B, Roisnel T, Maron L, Carpentier JF. Discrete, solvent-free alkaline-earth metal cations: metal···fluorine interactions and ROP catalytic activity. J Am Chem Soc 2011; 133:9069-87. [PMID: 21545119 DOI: 10.1021/ja2024977] [Citation(s) in RCA: 182] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Efficient protocols for the syntheses of well-defined, solvent-free cations of the large alkaline-earth (Ae) metals (Ca, Sr, Ba) and their smaller Zn and Mg analogues have been designed. The reaction of 2,4-di-tert-butyl-6-(morpholinomethyl)phenol ({LO(1)}H), 2-{[bis(2-methoxyethyl)amino]methyl}-4,6-di-tert-butylphenol ({LO(2)}H), 2-[(1,4,7,10-tetraoxa-13-azacyclopentadecan-13-yl)methyl]-4,6-di-tert-butylphenol ({LO(3)}H), and 2-[(1,4,7,10-tetraoxa-13-azacyclo-pentadecan-13-yl)methyl]-1,1,1,3,3,3-hexafluoropropan-2-ol ({RO(3)}H) with [H(OEt(2))(2)](+)[H(2)N{B(C(6)F(5))(3)}(2)](-) readily afforded the doubly acidic pro-ligands [{LO(1)}HH](+)[X](-) (1), [{LO(2)}HH](+)[X](-) (2), [{LO(3)}HH](+)[X](-) (3), and [{RO(3)}HH](+)[X](-) (4) ([X](-) = [H(2)N{B(C(6)F(5))(3)}(2)](-)). The addition of 2 to Ca[N(SiMe(3))(2)](2)(THF)(2) and Sr[N(SiMe(3))(2)](2)(THF)(2) yielded [{LO(2)}Ca(THF)(0.5)](+)[X](-) (5) and [{LO(2)}Sr(THF)](+)[X](-) (6), respectively. Alternatively, 5 could also be prepared upon treatment of {LO(2)}CaN(SiMe(3))(2) (7) with [H(OEt(2))(2)](+)[X](-). Complexes [{LO(3)}M](+)[X](-) (M = Zn, 8; Mg, 9; Ca, 10; Sr, 11; Ba, 12) and [{RO(3)}M](+)[X](-) (M = Zn, 13; Mg, 14; Ca, 15; Sr, 16; Ba, 17) were synthesized in high yields (70-90%) by reaction of 3 or 4 with the neutral precursors M[N(SiMe(3))(2)](2)(THF)(x) (M = Zn, Mg, x = 0; M = Ca, Sr, Ba, x = 2). All compounds were fully characterized by spectroscopic methods, and the solid-sate structures of compounds 1, 3, 7, 8, 13, 14, {15}(4)·3CD(2)Cl(2), {16}(4)·3CD(2)Cl(2), and {{17}(4)·EtOH}·3CD(2)Cl(2) were determined by X-ray diffraction crystallography. Whereas the complexes are monomeric in the case of Zn and Mg, they form bimetallic cations in the case of Ca, Sr and Ba; there is no contact between the metal and the weakly coordinating anion. In all metal complexes, the multidentate ligand is κ(6)-coordinated to the metal. Strong intramolecular M···F secondary interactions between the metal and F atoms from the ancillary ligands are observed in the structures of {15}(4)·3CD(2)Cl(2), {16}(4)·3CD(2)Cl(2), and {{17}(4)·EtOH}·3CD(2)Cl(2). VT (19)F{(1)H} NMR provided no direct evidence that these interactions are maintained in solution; nevertheless, significant Ae···F energies of stabilization of 25-26 (Ca, Ba) and 40 kcal·mol(-1) (Sr) were calculated by NBO analysis on DFT-optimized structures. The identity and integrity of the cationic complexes are preserved in solution in the presence of an excess of alcohol (BnOH, (i)PrOH) or L-lactide (L-LA). Efficient binary catalytic systems for the immortal ring-opening polymerization of L-LA (up to 3,000 equiv) are produced upon addition of an excess (5-50 equiv) of external protic nucleophilic agents (BnOH, (i)PrOH) to 8-12 or 13-17. PLLAs with M(n) up to 35,000 g·mol(-1) were produced in a very controlled fashion (M(w)/M(n) ≈ 1.10-1.20) and without epimerization. In each series of catalysts, the following order of catalytic activity was established: Mg ≪ Zn < Ca < Sr ≈ Ba; also, Ae complexes supported by the aryloxide ligand are more active than their parents supported by the fluorinated alkoxide ancillary, possibly owing to the presence of Ae···F interactions in the latter case. The rate law -d[L-LA]/dt = k(p)·[L-LA](1.0)·[16](1.0)·[BnOH](1.0) was established by NMR kinetic investigations, with the corresponding activation parameters ΔH(++) = 14.8(5) kcal·mol(-1) and ΔS(++) = -7.6(2.0) cal·K(-1)·mol(-1). DFT calculations indicated that the observed order of catalytic activity matches an increase of the L-LA coordination energy onto the cationic metal centers with parallel decrease of the positive metal charge.
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Affiliation(s)
- Yann Sarazin
- UMR 6226 Sciences Chimiques de Rennes, Université de Rennes 1-CNRS, Campus de Beaulieu, 35042 Rennes Cedex, France.
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van der Meulen I, Gubbels E, Huijser S, Sablong R, Koning CE, Heise A, Duchateau R. Catalytic Ring-Opening Polymerization of Renewable Macrolactones to High Molecular Weight Polyethylene-like Polymers. Macromolecules 2011. [DOI: 10.1021/ma200685u] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Inge van der Meulen
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Erik Gubbels
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Saskia Huijser
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Rafaël Sablong
- Polymer Technology Group Eindhoven BV, Het Kranenveld, P.O. Box 6284, 5600 HG Eindhoven, The Netherlands
| | - Cor E. Koning
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Andreas Heise
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- School of Chemical Sciences, Dublin City University, Dublin, Ireland
| | - Rob Duchateau
- Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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Susperregui N, Kramer MU, Okuda J, Maron L. Theoretical Study on the Ring-Opening Polymerization of ε-Caprolactone by [YMeX(THF)5]+ with X = BH4, NMe2. Organometallics 2011. [DOI: 10.1021/om100606p] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nicolas Susperregui
- Université de Toulouse and CNRS, INSA, UPS, UMR 5215 LPCNO, 135 avenue de Rangueil, F-31077 Toulouse, France
| | - Mathias U. Kramer
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany
| | - Jun Okuda
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany
| | - Laurent Maron
- Université de Toulouse and CNRS, INSA, UPS, UMR 5215 LPCNO, 135 avenue de Rangueil, F-31077 Toulouse, France
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Stephen R, Sunoj RB, Ghosh P. A computational insight into a metal mediated pathway for the ring-opening polymerization (ROP) of lactides by an ionic {(NHC)2Ag}+X− (X = halide) type N-heterocyclic carbene (NHC) complex. Dalton Trans 2011; 40:10156-61. [DOI: 10.1039/c1dt10345h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Discrete, Base-Free, Cationic Alkaline-Earth Complexes - Access and Catalytic Activity in the Polymerization of Lactide. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000558] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Clark L, Cushion MG, Dyer HE, Schwarz AD, Duchateau R, Mountford P. Dicationic and zwitterionic catalysts for the amine-initiated, immortal ring-opening polymerisation of rac-lactide: facile synthesis of amine-terminated, highly heterotactic PLA. Chem Commun (Camb) 2010; 46:273-5. [DOI: 10.1039/b919162c] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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23
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Li B, Wang Y, Yao Y, Zhang Y, Shen Q. Synthesis, structure and reactivity of samarium complexes supported by Schiff-base ligands. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2009.03.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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24
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A density functional theory study of the mechanisms of scandium-alkoxide initiated coordination–insertion ring-opening polymerization of cyclic esters. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.06.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Yao H, Zhang Y, Sun H, Shen Q. Anionic Lanthanide Complexes Bearing a Bis(phenoxy)-Functionalized N-Heterocyclic Carbene Ligand: Syntheses and Molecular Structures. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801109] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Liu J, Ling J, Li X, Shen Z. Monomer insertion mechanism of ring-opening polymerization of ɛ-caprolactone with yttrium alkoxide intermediate: A DFT study. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2008.10.038] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Sheng HT, Li JM, Zhang Y, Yao YM, Shen Q. Synthesis and molecular structure of new heterometal alkoxide clusters Ln2Na8(OCH2CF3)14(THF)6 (Ln=Sm,Y,Yb): Highly active catalysts for polymerization of ε-caprolactone and trimethylene carbonate. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.01.031] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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Liu Q, Meermann C, Görlitzer HW, Runte O, Herdtweck E, Sirsch P, Törnroos KW, Anwander R. Cationic rare-earth metal SALEN complexes. Dalton Trans 2008:6170-8. [DOI: 10.1039/b808781d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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