1
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Wang Y, Zhang W, Wang X, Zuo W, Xue X, Ma Y, Sun WH. N-(2-(Diphenylphosphino)ethyl)-2-alkyl-5,6,7,8-tetrahydro-quinolin-8-amines iron(ii) complexes: structural diversity and the ring opening polymerization of ε-caprolactone. RSC Adv 2023; 13:29866-29878. [PMID: 37842685 PMCID: PMC10568405 DOI: 10.1039/d3ra05867k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 09/27/2023] [Indexed: 10/17/2023] Open
Abstract
A series of N-(2-(diphenylphosphino)ethyl)-2-alkyl-5,6,7,8-tetrahydroquinolin-8-amines was prepared and used in individually reacting with iron chloride under nitrogen atmosphere to form their iron(ii) complexes Fe1-Fe6. All compounds were characterized using FT-IR spectroscopy and elemental analyses, the organic compounds were confirmed with NMR measurements, and the iron complexes were submitted to single-crystal X-ray diffraction, revealing Fe1, Fe2, Fe4, Fe5, and Fe6 as either mono- or di-nuclear forms. Forming a binary system in situ with two equivalents of LiCH2SiMe3, all iron complexes Fe1-Fe6 efficiently initiated the ring opening polymerization of ε-caprolactone, achieving the TOF up to 8.8 × 103 h-1. More importantly, the resultant polycaprolactone (PCL) possessed high molecular weights with the Mn range of 9.21-24.3 × 104 g mol-1, being a rare case of the iron(ii) catalyst in producing PCL with such high molecular weight. The 1H NMR and MALDI-TOF investigations demonstrated that the PCLs were linear features capped with a methoxy group or CH2SiMe3 or cyclic structure that varied with the molar ratio of [ε-CL]/Fe.
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Affiliation(s)
- Yun Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University Shanghai 201620 China
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology Beijing 100029 China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
| | - Wenjuan Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University Shanghai 201620 China
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology Beijing 100029 China
| | - Xing Wang
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology Beijing 100029 China
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
| | - Weiwei Zuo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University Shanghai 201620 China
| | - Xiaopan Xue
- Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science and Engineering, Beijing Institute of Fashion Technology Beijing 100029 China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
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2
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Sachdeva G, Bamal Y, Ladan A, Tiwari OS, Rawat V, Yadav P, Verma VP. Calixarene-Metal Complexes in Lactide Polymerization: The Story so Far. ACS OMEGA 2023; 8:13479-13491. [PMID: 37091416 PMCID: PMC10116533 DOI: 10.1021/acsomega.2c08028] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Accepted: 03/28/2023] [Indexed: 05/03/2023]
Abstract
Polylactide synthetic procedures have lately gained attention, possibly due to their biocompatibility and the environmental problems associated with fossil-fuel-based polymers. Polylactides can be obtained from natural sources such as cassava, corn, and sugar beet, and polylactides can be manufactured in a laboratory using a variety of processes that begin with lactic acid or lactide. One of the most effective synthetic pathways is through a Lewis acid catalyzed ring-opening polymerization of lactides to obtain a well-defined polymer. In this regard, calixarenes, because of their easy functionalization and tunable properties, have been widely considered to be a suitable 3D molecular scaffold for new metal complexes that can be used for lactide polymerization. This review summarizes the progress made in applying some metal-calixarene complexes in the ring-opening polymerization of lactide.
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Affiliation(s)
- Garima Sachdeva
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122412, India
| | - Yogita Bamal
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122412, India
| | - Ankit Ladan
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122412, India
| | - Om Shanker Tiwari
- The
Shmunis School of Biomedicine and Cancer Research, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Varun Rawat
- Amity
School of Applied Sciences, Amity University
Haryana, Gurugram 122412, India
- Faculty
of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
- Email for V.R.:
| | - Priyanka Yadav
- Department
of Chemistry, Banasthali University, Banasthali Newai 304022, India
| | - Ved Prakash Verma
- Department
of Chemistry, Banasthali University, Banasthali Newai 304022, India
- Email for V.P.V.:
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3
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Yu B, Xu X, Huang ZN, Tao K, Sun HL, Yang QZ, Wang W. Iron–Aryloxide Complex Bearing Bis(dipyrromethene) Ligands for the Ring-Opening Polymerization of ε-Caprolactone. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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4
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Hashmi OH, Capet F, Visseaux M, Champouret Y. Homoleptic and Heteroleptic Substituted Amidomethylpyridine Iron Complexes: Synthesis, Structure and Polymerization of rac‐Lactide. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Obaid H. Hashmi
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
| | - Frederic Capet
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
| | - Marc Visseaux
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
| | - Yohan Champouret
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
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6
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Xing T, Prior TJ, Redshaw C. Lead calix[ n]arenes ( n = 4, 6, 8): structures and ring opening homo-/co-polymerization capability for cyclic esters. Dalton Trans 2021; 50:15140-15152. [PMID: 34612241 DOI: 10.1039/d1dt02790e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of [LiPb(OiPr)3]2 (generated in situ) with either p-tert-butylcalix[4]areneH4 (L4H4) or p-tert-butylcalix[6]areneH6 (L6H6) resulted in the heterometallic lithium/lead complexes [Pb4Li2(L4)4H6(MeCN)3]·4.5MeCN (1·4.5MeCN) and [Pb8Li10Cl2(L6H2)3(L6)(OH)2(O)2(H2O)2(MeCN)4]·14MeCN (2·14MeCN), respectively. Use of the dimethyleneoxa-bridged p-tert-butyltetrahomodioxacalix[6]areneH6 (L6'H6) with five equivalents of [Pb(OiPr)2] afforded [Pb13(L6')3O4(iPrOH)]·11MeCN (3·11MeCN). Use of the larger p-tert-butylcalix[8]areneH8 (L8H8) with [Pb(OtBu)2] or {Pb[N(TMS)2]} (TMS = SiMe3) afforded the products [Pb12(L8)2O4]·8.7C7H8 (4·8.7C7H8) or [Pb6(SiMe3)2(L8)O2Cl2] (5), respectively. Reaction of {Pb[N(TMS)2]} (generated in situ from (Me3Si)2NH, nBuLi and PbCl2) with L6H6 afforded, after work-up (MeCN), the mixed-metal complex [Pb10Li2(L6)2(OH)Cl(O)4]·9.5MeCN (6·9.5MeCN). Reaction of distilled {Pb[N(TMS)2]} (six equivalents) with L8H8 resulted in the complex [Pb12(L8)2O4]·12MeCN (7·12MeCN). Complexes 1-7, Pb(OiPr)2 and [Pb(N(TMS)2)2] have been screened for their potential to act as pre-catalysts in the ring opening polymerization (ROP) of ε-caprolactone (ε-CL) and δ-valerolactone (δ-VL) and the copolymerization thereof. Generally, the lithiated complexes 1 and 2 exhibited better activities than the other pre-catalysts screened herein. For ε-CL and δ-VL, moderate activity at 130 °C over 24 h was observed for 1-7. In the case of the co-polymerization of ε-CL with δ-VL, 1-7, Pb(OiPr)2 and [Pb(N(TMS)2)2] afforded reasonable conversions and high molecular weight polymers. The systems 1-7, Pb(OiPr)2 and [Pb(N(TMS)2)2] also proved to be active in the ROP of the rac-lactide (r-LA); the activity trend was found to be 1 > 2 ≈ Pb(OiPr)2 ≈ [Pb(N(TMS)2)2] > 4 > 5 ≈ 6 ≈ 7 > 3.
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Affiliation(s)
- Tian Xing
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Timothy J Prior
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
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7
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Brazeau SE, Pope F, Huang VL, Anklin C, Rheingold AL, Doerrer LH. Phosphine ligands as protecting groups for 3d complexes in oxidation by O2. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114609] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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8
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Lutsenko IA, Kiskin MA, Nikolaevskii SA, Nelyubina YV, Primakov PV, Goloveshkin AS, Imshennik VK, Maksimov YV, Sidorov AA, Eremenko IL. Nontrivial structural organization of pivalate complexes with the fragment {Fe2Li(μ3-O)}. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.05.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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9
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Machado dos Santos F, Edivirges Alvarenga M, Valdo AKSM, Rabelo R, Cangussu de Castro Gomes D, de Fátima Â, Vinicius Costa Lara T, da Silva CM, Tasso TT, Neto JHA, Batista AA, Ayala AP, Ellena JA, Ferraz Guimarães V, Maria Alves Oliveira C, da Silva LC, Gontijo Vaz B, Terra Martins F. A giant hybrid organic–inorganic octahedron from a narrow rim carboxylate calixarene. Chem Commun (Camb) 2020; 56:15024-15027. [DOI: 10.1039/d0cc07043b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we discovered an unprecedented giant octahedral coordination compound bearing 16 Zn2+, 12 Na+, 8 O2−, 4 OH−, 13 H2O and 6 L4− ligands [L4− = fully deprotonated tetra(carboxymethoxy)calix[4]arene].
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Affiliation(s)
| | | | | | - Renato Rabelo
- Institute of Molecular Science (ICMol)
- University of Valencia
- Paterna 46980
- Spain
| | | | - Ângelo de Fátima
- Department of Chemistry
- Federal University of Minas Gerais
- Belo Horizonte
- Brazil
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10
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Gómez-Núñez A, Alonso-Gil S, López C, Roura-Grabulosa P, Vilà A. From Ethanolamine Precursor Towards ZnO-How N Is Released from the Experimental and Theoretical Points of View. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E1415. [PMID: 31623410 PMCID: PMC6835746 DOI: 10.3390/nano9101415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 09/26/2019] [Accepted: 09/29/2019] [Indexed: 11/16/2022]
Abstract
This work presents experimental and computational studies on ZnO formation after decomposition of a sol-gel precursor containing ethanolamine and Zn(II) acetate. The structural modifications suffered during decomposition of the monomeric and dimeric Zn(II) complexes formed, containing bidentate deprotonated ethanolamine and acetato ligands, have been described experimentally and explained via Car-Parrinello Molecular Dynamics. Additional metadynamics simulations provide an overview of the dimer evolution by the cleavage of the Zn-N bond, the structural changes produced and their effects on the Zn(II) environment. The results provide conclusive evidence of the relevance of ethanolamine used as a stabilizer in the formation of ZnO.
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Affiliation(s)
- Alberto Gómez-Núñez
- Department of Electronic and Biomedical Engineering, University of Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, Joan XXIII s/n, 08028 Barcelona, Spain.
- FAE Francisco Albero S.A.U., Rafael Barradas 19, Granvia L'Hospitalet Economic District, 08908 L'Hospitalet de Llobregat, Spain.
| | - Santiago Alonso-Gil
- Department of Inorganic and Organic Chemistry, University of Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejškova 2155/3, 18223 Prague 8, Czech Republic.
| | - Concepción López
- Department of Inorganic and Organic Chemistry, University of Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
| | - Pere Roura-Grabulosa
- Department of Physics, Campus Montilivi, University of Girona, Edif. PII, 17003 Girona, Spain.
| | - Anna Vilà
- Department of Electronic and Biomedical Engineering, University of Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, Joan XXIII s/n, 08028 Barcelona, Spain.
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11
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Champouret Y, Hashmi OH, Visseaux M. Discrete iron-based complexes: Applications in homogeneous coordination-insertion polymerization catalysis. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.03.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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12
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Sinha AK, Vigalok A, Rawat V. Catalytic application of zinc complex of oxygen depleted 1,3-bis(pyrazole)-p-tert-butylcalix[4]arene. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.02.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Dou J, Zhu D, Zhang W, Wang R, Wang S, Zhang Q, Zhang X, Sun WH. Highly efficient iron(II) catalysts toward ring opening polymerization of ε-caprolactone through in situ initiation. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.01.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Kuwabara T, Tezuka R, Ishikawa M, Yamazaki T, Kodama S, Ishii Y. Ring Slippage and Dissociation of Pentamethylcyclopentadienyl Ligand in an (η5-Cp*)Ir Complex with a κ3-O,C,O Tridentate Calix[4]arene Ligand under Mild Conditions. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00257] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takuya Kuwabara
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, Tokyo 112-8551 Japan
| | - Ryogen Tezuka
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, Tokyo 112-8551 Japan
| | - Mikiya Ishikawa
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, Tokyo 112-8551 Japan
| | - Takuya Yamazaki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, Tokyo 112-8551 Japan
| | - Shintaro Kodama
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, Tokyo 112-8551 Japan
| | - Youichi Ishii
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, Tokyo 112-8551 Japan
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15
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Ortuño MA, Dereli B, Chiaie KRD, Biernesser AB, Qi M, Byers JA, Cramer CJ. The Role of Alkoxide Initiator, Spin State, and Oxidation State in Ring-Opening Polymerization of ε-Caprolactone Catalyzed by Iron Bis(imino)pyridine Complexes. Inorg Chem 2018; 57:2064-2071. [PMID: 29381341 DOI: 10.1021/acs.inorgchem.7b02964] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Density functional theory (DFT) is employed to characterize in detail the mechanism for the ring-opening polymerization (ROP) of ε-caprolactone catalyzed by iron alkoxide complexes bearing redox-active bis(imino)pyridine ligands. The combination of iron with the non-innocent bis(imino)pyridine ligand permits comparison of catalytic activity as a function of oxidation state (and overall spin state). The reactivities of aryl oxide versus alkoxide initiators for the ROP of ε-caprolactone are also examined. An experimental test of a computational prediction reveals an Fe(III) bis(imino)pyridine bis-neopentoxide complex to be competent for ROP of ε-caprolactone.
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Affiliation(s)
- Manuel A Ortuño
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Büsra Dereli
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Kayla R Delle Chiaie
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Ashley B Biernesser
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Miao Qi
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Jeffery A Byers
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College , 2609 Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Christopher J Cramer
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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16
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Cozzolino M, Leo V, Tedesco C, Mazzeo M, Lamberti M. Salen, salan and salalen iron(iii) complexes as catalysts for CO2/epoxide reactions and ROP of cyclic esters. Dalton Trans 2018; 47:13229-13238. [DOI: 10.1039/c8dt03169j] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Salan, salen and salalen iron complexes as catalysts in CO2/epoxide reactions and in the ROP of ε-caprolactone and l-lactide.
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Affiliation(s)
| | - Vincenza Leo
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università di Salerno
- Fisciano
- Italy
| | - Consiglia Tedesco
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università di Salerno
- Fisciano
- Italy
| | - Mina Mazzeo
- Dipartimento di Chimica e Biologia “A. Zambelli”
- Università di Salerno
- Fisciano
- Italy
| | - Marina Lamberti
- Dipartimento di Fisica “E. Caianiello”
- Università di Salerno
- Fisciano
- Italy
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17
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Delle Chiaie KR, Biernesser AB, Ortuño MA, Dereli B, Iovan DA, Wilding MJT, Li B, Cramer CJ, Byers JA. The role of ligand redox non-innocence in ring-opening polymerization reactions catalysed by bis(imino)pyridine iron alkoxide complexes. Dalton Trans 2017; 46:12971-12980. [PMID: 28932853 DOI: 10.1039/c7dt03067c] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The reactivity of iron-based ring opening polymerization catalysts is compared when the catalyst is in three different oxidation states. Formally iron(i) monoalkoxide complexes 3a (p-methoxyphenoxide) and 3b (neopentoxide) supported by bis(imino)pyridine ligands were synthesized and investigated as catalysts for the ring opening polymerization and copolymerization of various monomers. For most monomers, 3a and 3b were superior catalysts compared to analogous, formally iron(ii) and iron(iii) complexes (1a/1b and 2a/2b, respectively) for the ring opening polymerization of various cyclic ester and cyclic carbonate monomers. Experimental and computational investigation into the electronic structures of 3a and 3b revealed that they are most accurately described as containing a high spin iron(ii) center that is antiferromagnetically coupled to a singly reduced bis(imino)pyridine ligand. This electronic structure leads to increased electron density near the metal center without modulating the apparent metal oxidation state, which results in superior catalytic performance for the more highly reduced 3a and 3b compared to the increasingly more oxidized complexes (i.e.1a/1b and 2a/2b, respectively) in ring opening polymerization reactions. These findings have significant ramifications for the emerging field of redox-switchable polymerization catalysis.
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Affiliation(s)
- K R Delle Chiaie
- Eugene F. Merkert Chemistry Center, Department of Chemistry, Boston College, 2609 Beacon St., Chestnut Hill, Massachusetts 02467, USA.
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18
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Martins FT, Oliveira BGD, Sarotti AM, de Fátima Â. Winged-Cone Conformation in Hexa- p-tert-butylcalix[6]arene Driven by the Unusually Strong Guest Encapsulation. ACS OMEGA 2017; 2:5315-5323. [PMID: 31457800 PMCID: PMC6641646 DOI: 10.1021/acsomega.7b00900] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 08/21/2017] [Indexed: 06/10/2023]
Abstract
Hexa-p-tert-butylcalix[6]arene (1) is believed to adopt a winged conformation in a solution, featured by four phenyl rings perpendicular to the calix basis and two others at 1,4-positions lying down. However, there is some controversy on the occurrence of this conformation because it has never been found in the solid state of calix[6]arenes, regardless of the substitution pattern at lower and upper rims. Here, we have observed the winged-cone conformation for the first time in a solvate form of 1 with dimethyl sulfoxide (DMSO), dimethylformamide, and pyridine. The DMSO molecule is strongly encapsulated into 1 through two OH···O hydrogen bonds with both flattened phenolic moieties, one lp(S)···π and four CH···π interactions with the four perpendicular phenyl rings. This host-guest complex has energy lower by 23.4 kcal mol-1 than the isolated species. In addition, another DMSO solvate form with 1,2,3-alternate conformation was also obtained in this study, and its structure is compared with that of the precedent one. A detailed density functional theory study has also been carried out to understand the energetic relationships among cone conformers, intramolecular hydrogen-bonding patterns, and DMSO encapsulation.
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Affiliation(s)
- Felipe Terra Martins
- Instituto
de Química, Universidade Federal
de Goiás, P.O. Box 131, 74690-900 Goiânia, Brazil
- Grupo
de Estudos em Química Orgânica e Biológica (GEQOB),
Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos
6627, 31270-901 Belo Horizonte, Brazil
| | - Breno Germano de
Freitas Oliveira
- Grupo
de Estudos em Química Orgânica e Biológica (GEQOB),
Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos
6627, 31270-901 Belo Horizonte, Brazil
| | - Ariel M. Sarotti
- Instituto
de Química Rosario (IQUIR), Universidad
Nacional de Rosario-CONICET, Suipacha 531, S2002LRK Rosario, Argentina
| | - Ângelo de Fátima
- Grupo
de Estudos em Química Orgânica e Biológica (GEQOB),
Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos
6627, 31270-901 Belo Horizonte, Brazil
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19
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Lu N, Jiang Z, Pei H, Liu W, Li Y, Dong Y. Ring‐Opening Polymerization of ε‐Caprolactone Initiated by Aluminium Complexes Based on Pyridine‐Substituted Asymmetric β‐Diketiminate Ligands. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601375] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ning Lu
- College of Chemistry Chemical Engineering and Materials Science Soochow University 215123 Suzhou P. R. China
| | - Zhilei Jiang
- College of Chemistry Chemical Engineering and Materials Science Soochow University 215123 Suzhou P. R. China
| | - Hao Pei
- College of Chemistry Chemical Engineering and Materials Science Soochow University 215123 Suzhou P. R. China
| | - Wei Liu
- College of Chemistry Chemical Engineering and Materials Science Soochow University 215123 Suzhou P. R. China
| | - Yahong Li
- College of Chemistry Chemical Engineering and Materials Science Soochow University 215123 Suzhou P. R. China
| | - Yaping Dong
- Key Laboratory of Salt Lake Resources and Chemistry Qinghai Institute of Salt Lakes Chinese Academy of Sciences 810008 Xining P. R. China
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20
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Geng C, Peng Y, Wang L, Roesky HW, Liu K. A multimetallic iron(ii)-lithium complex as a catalyst for ε-caprolactone polymerization. Dalton Trans 2016; 45:15779-15782. [PMID: 27055011 DOI: 10.1039/c6dt00078a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of the lithium salt of β-ketimine with FeCl2(THF)1.5 in the presence of LiN(SiMe3)2 and water affords the multimetallic iron(ii)-lithium complex 1, [(LMe)2Fe]3Li2O [where LMe = MeC(O)CHC(NMe)Me]. In complex 1 three separated (LMe)2Fe units are bound together by one Li2O species, which leads to the formation of an interesting {Fe3Li2O} core structure. Complex 1 can be used as a single-component initiator for the ring-opening polymerization of ε-caprolactone at room temperature, achieving a monomer conversion of 98% within 100 min, and a narrow molecular weight distribution (PDI = 1.28) of the resulting polymer.
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Affiliation(s)
- Chao Geng
- State Key Laboratory of Fine Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China.
| | - Ying Peng
- State Key Laboratory of Fine Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China.
| | - Lijuan Wang
- State Key Laboratory of Fine Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China.
| | - Herbert W Roesky
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany.
| | - Kaipeng Liu
- State Key Laboratory of Fine Chemicals, School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian 116024, P. R. China.
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21
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Martins FT, da Silva CM, Vasconcelos GA, Gontijo Vaz B, Vieira TDS, Queiroz Júnior LHK, de Fátima Â. Lower rim dimerization of a calixarene through the encapsulation of sodium ions. CrystEngComm 2016. [DOI: 10.1039/c6ce01387b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Vita F, Gavilán H, Rossi F, de Julián Fernández C, Secchi A, Arduini A, Albertini F, Morales MP. Tuning morphology and magnetism of magnetite nanoparticles by calix[8]arene-induced oriented aggregation. CrystEngComm 2016. [DOI: 10.1039/c6ce01252c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Redshaw C, Walton M, Michiue K, Chao Y, Walton A, Elo P, Sumerin V, Jiang C, Elsegood MRJ. Vanadyl calix[6]arene complexes: synthesis, structural studies and ethylene homo-(co-)polymerization capability. Dalton Trans 2015; 44:12292-303. [PMID: 25765783 DOI: 10.1039/c5dt00376h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of p-tert-butylcalix[6]areneH6 (L(6)H6) with in situ [LiVO(Ot-Bu)4] afforded, after work-up, the dark green complex [Li(MeCN)4][V2(O)2Li(MeCN)(L(6)H2)2]·8MeCN (1·8MeCN). On one occasion, the reaction led to the formation of a mixture of products, the bulk of which differing from 1 only in the amount of solvate, viz.2·9.67MeCN. The second minor, yellow product has the formula {[(VO2)2(L(6)H2)(Li(MeCN)2)2]·2MeCN}n (3·2MeCN), and comprises a 1D polymeric structure with links through the L(6)H2 ligand and Li2O2 units. When the reverse order of addition was employed such that lithium tert-butoxide (7.5 equivalents) was added to L(6)H6, and subsequently treated with VOCl3 (2 equiv.), the complex {[VO(THF)][VO(μ-O)]2Li(THF)(Et2O)][L(6)]}·2Et2O·0.5THF (4·2Et2O·0.5THF), which contains a trinuclear motif possessing a central, octahedral vanadyl centre linked via oxo bridges to two tetrahedral (C3v) vanadyl centres, was isolated. The calix[6]arene in 4 is severely twisted and adopts a ‘down, down, down, down, out, out’ conformation. Use of excess lithium tert-butoxide led to a complex very similar to 4, differing only in the solvent of crystallization, namely 5·Et2O·2THF. The ability of 1 and 5 to act as pre-catalysts for ethylene polymerization in the presence of a variety of co-catalysts and under various conditions has been investigated. Co-polymerization of ethylene with propylene and with 1-hexene have also been conducted; results are compared versus VO(OEt)Cl2.
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Affiliation(s)
| | - Mark Walton
- School of Chemistry
- University of East Anglia
- Norwich
- UK
| | - Kenji Michiue
- Process Technology Center
- Mitsui Chemicals Inc
- Chiba 299-0265
- Japan
| | - Yimin Chao
- School of Chemistry
- University of East Anglia
- Norwich
- UK
| | - Alex Walton
- School of Physics & Astronomy
- University of Leeds
- Leeds
- UK
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Redshaw C, Walton MJ, Lee DS, Jiang C, Elsegood MRJ, Michiue K. Vanadium(V) Oxo and Imido Calix[8]arene Complexes: Synthesis, Structural Studies, and Ethylene Homo/Copolymerisation Capability. Chemistry 2015; 21:5199-210. [DOI: 10.1002/chem.201406084] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Indexed: 11/07/2022]
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Walton MJ, Lancaster SJ, Redshaw C. Highly Selective and Immortal Magnesium Calixarene Complexes for the Ring-Opening Polymerization ofrac-Lactide. ChemCatChem 2014. [DOI: 10.1002/cctc.201402041] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Fliedel C, Mameri S, Dagorne S, Avilés T. Controlled ring-opening polymerization of trimethylene carbonate and access to PTMC-PLA block copolymers mediated by well-definedN-heterocyclic carbene zinc alkoxides. Appl Organomet Chem 2014. [DOI: 10.1002/aoc.3154] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Christophe Fliedel
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; Caparica 2829-516 Portugal
- Institut de Chimie de Strasbourg; CNRS-Université de Strasbourg; 67000 Strasbourg France
| | - Samir Mameri
- Institut de Chimie de Strasbourg; CNRS-Université de Strasbourg; 67000 Strasbourg France
| | - Samuel Dagorne
- Institut de Chimie de Strasbourg; CNRS-Université de Strasbourg; 67000 Strasbourg France
| | - Teresa Avilés
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; Caparica 2829-516 Portugal
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Wu XY, Ren ZG, Lang JP. Ni(ii) tetraphosphine complexes as catalysts/initiators in the ring opening polymerization of ε-caprolactone. Dalton Trans 2014; 43:1716-23. [DOI: 10.1039/c3dt52412d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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28
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Fang YY, Gong WJ, Shang XJ, Li HX, Gao J, Lang JP. Synthesis and structure of a ferric complex of 2,6-di(1H-pyrazol-3-yl)pyridine and its excellent performance in the redox-controlled living ring-opening polymerization of ε-caprolactone. Dalton Trans 2014; 43:8282-9. [DOI: 10.1039/c4dt00475b] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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29
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Walton MJ, Lancaster SJ, Wright JA, Elsegood MRJ, Redshaw C. Zinc calixarene complexes for the ring opening polymerization of cyclic esters. Dalton Trans 2014; 43:18001-9. [DOI: 10.1039/c4dt02226b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A number of zinc calixarene complexes have been structurally characterized and screened for the ROP of ε-caprolactone and rac-lactide.
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Affiliation(s)
- Mark J. Walton
- Energy Materials Laboratory
- School of Chemistry
- University of East Anglia
- Norwich, UK
| | - Simon J. Lancaster
- Energy Materials Laboratory
- School of Chemistry
- University of East Anglia
- Norwich, UK
| | - Joseph A. Wright
- Energy Materials Laboratory
- School of Chemistry
- University of East Anglia
- Norwich, UK
| | | | - Carl Redshaw
- Department of Chemistry
- University of Hull
- Hull, UK
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30
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Li Y, Zhao KQ, Feng C, Elsegood MRJ, Prior TJ, Sun X, Redshaw C. Ethyleneglycol tungsten complexes of calix[6 and 8]arenes: synthesis, characterization and ROP of ε-caprolactone. Dalton Trans 2014; 43:13612-9. [DOI: 10.1039/c4dt01936a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Ethylene glycolate tungsten complexes bearing calix[n]arene ligands (n = 6, 8) have been structurally characterized and exhibit catalytic activity for the ROP of ε-caprolactone in the presence of benzyl alcohol.
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Affiliation(s)
- Yuanzhuo Li
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu, China
| | - Ke-Qing Zhao
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu, China
| | - Chun Feng
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu, China
| | | | | | - Xinsen Sun
- Department of Chemistry
- University of Hull
- Hull, UK
| | - Carl Redshaw
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu, China
- Department of Chemistry
- University of Hull
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31
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Ojwach SO, Okemwa TT, Attandoh NW, Omondi B. Structural and kinetic studies of the polymerization reactions of ε-caprolactone catalyzed by (pyrazol-1-ylmethyl)pyridine Cu(II) and Zn(II) complexes. Dalton Trans 2013; 42:10735-45. [PMID: 23774962 DOI: 10.1039/c3dt51338f] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural and kinetic studies of polymerization reactions of ε-caprolactone (ε-CL) using (pyrazolylmethyl)pyridine Cu(II) and Zn(II) complexes as initiators is described. Reactions of 2-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L1) and 2-(3,5-diphenylpyrazol-1-ylmethyl)pyridine (L2) with Zn(Ac)2·2H2O or Cu(Ac)2·2H2O produced the corresponding complexes [Zn(Ac)2(L1)] (1), [Cu(Ac)2(L1)] (2), [Zn(Ac)2(L2)] (3) and [Cu2(Ac)4(L2)2] (4) respectively. Solid state structures of 1 and 4 confirmed that complexes 1 and 4 are monomeric and dimeric respectively and that L1 is bidentate in 1 while L2 is monodentate in 4. X-band EPR spectra of 2 and 4 revealed that complex 2 is monomeric both in solid and solution state, while the paddle-wheel structure of 4 is retained in solution. Complexes 1-4 formed active initiators in the ring opening polymerization of ε-CL. Zn(II) complexes 1 and 3 exhibited higher rate constants of 0.044 h(-1) and 0.096 h(-1) respectively compared to rate constants of 0.017 h(-1) and 0.031 h(-1) observed for the corresponding Cu(II) complexes 2 and 4 respectively at 110 °C. All the polymerization reactions follow pseudo first-order kinetic with respect to ε-CL monomer. Initiator 1 showed first-order dependency on the polymerization reactions and utilizes only one active site as the initiating group. The molecular weights of the polymers produced range from 1982 g mol(-1) to 14,568 g mol(-1) and exhibited relatively broad molecular weight distributions associated with transesterification reactions.
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Affiliation(s)
- Stephen O Ojwach
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01 Scottsville, 3209, South Africa.
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Affiliation(s)
- Nicola Y. Edwards
- a Department of Chemistry , Penn State Worthington Scranton , Dunmore , PA , USA
| | - Anthony L. Possanza
- a Department of Chemistry , Penn State Worthington Scranton , Dunmore , PA , USA
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33
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Schnee G, Fliedel C, Avilés T, Dagorne S. Neutral and Cationic N-Heterocyclic Carbene Zinc Adducts and the BnOH/Zn(C6F5)2Binary Mixture - Characterization and Use in the Ring-Opening Polymerization of β-Butyrolactone, Lactide, and Trimethylene Carbonate. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300292] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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35
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Du G, Wei Y, Zhang W, Dong Y, Lin Z, He H, Zhang S, Li X. Bis(imino)diphenylamido rare-earth metal dialkyl complexes: synthesis, structure, and catalytic activity in living ring-opening ε-caprolactone polymerization and copolymerization with γ-butyrolactone. Dalton Trans 2013; 42:1278-86. [DOI: 10.1039/c2dt31932b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Taylor SM, Sanz S, McIntosh RD, Beavers CM, Teat SJ, Brechin EK, Dalgarno SJ. p-tert-Butylcalix[8]arene: An Extremely Versatile Platform for Cluster Formation. Chemistry 2012; 18:16014-22. [DOI: 10.1002/chem.201202644] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Indexed: 11/09/2022]
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37
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Azor L, Bailly C, Brelot L, Henry M, Mobian P, Dagorne S. Stereoselective Synthesis of Biphenolate/Binaphtolate Titanate and Zirconate Alkoxide Species: Structural Characterization and Use in the Controlled ROP of Lactide. Inorg Chem 2012; 51:10876-83. [DOI: 10.1021/ic301352t] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Laurine Azor
- Laboratoire DECOMET, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Corinne Bailly
- Service de Radiocristallographie, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Lydia Brelot
- Service de Radiocristallographie, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Marc Henry
- Laboratoire de Chimie moléculaire
de l′Etat Solide, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Pierre Mobian
- Laboratoire de Chimie moléculaire
de l′Etat Solide, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France
| | - Samuel Dagorne
- Laboratoire DECOMET, Institut de Chimie de Strasbourg (CNRS-Université de Strasbourg), 1 rue Blaise Pascal, 67000 Strasbourg, France
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38
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Tong LH, Wong YL, Lee HK, Dilworth JR. The coordination chemistry of unsymmetric N-capped tripodal NO3 ligands with iron(III), oxo-vanadium(V) and dioxo-molybdenum(VI) metal centres. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.10.054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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39
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Chérémond Y, Crochet A, Fromm KM. Synthesis and Characterization of New Pentacoordinate Iron‐Based Aryloxide Complexes. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yvens Chérémond
- Department of Chemistry, Fribourg Center for Nanomaterials FriMat, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland, Fax: +41‐26‐3009738
| | - Aurélien Crochet
- Department of Chemistry, Fribourg Center for Nanomaterials FriMat, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland, Fax: +41‐26‐3009738
| | - Katharina M. Fromm
- Department of Chemistry, Fribourg Center for Nanomaterials FriMat, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland, Fax: +41‐26‐3009738
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40
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Taylor SM, McIntosh RD, Rezé J, Dalgarno SJ, Brechin EK. Oxacalix[3]arene-supported supertetrahedron. Chem Commun (Camb) 2012; 48:9263-5. [DOI: 10.1039/c2cc34792j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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41
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Sanz S, McIntosh RD, Beavers CM, Teat SJ, Evangelisti M, Brechin EK, Dalgarno SJ. Calix[4]arene-supported rare earth octahedra. Chem Commun (Camb) 2012; 48:1449-51. [DOI: 10.1039/c1cc14603c] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Alves LG, Hild F, Munhá RF, Veiros LF, Dagorne S, Martins AM. Synthesis and structural characterization of novel cyclam-based zirconium complexes and their use in the controlled ROP of rac-lactide: access to cyclam-functionalized polylactide materials. Dalton Trans 2012; 41:14288-98. [DOI: 10.1039/c2dt31133j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Rosal ID, Poteau R, Maron L. DFT study of the Ring Opening Polymerization of ε-caprolactone by grafted lanthanide complexes: 2—Effect of the initiator ligand. Dalton Trans 2011; 40:11228-40. [DOI: 10.1039/c1dt10567a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Sanz S, Ferreira K, McIntosh RD, Dalgarno SJ, Brechin EK. Calix[4]arene-supported FeIII2LnIII2 clusters. Chem Commun (Camb) 2011; 47:9042-4. [DOI: 10.1039/c1cc13055b] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rosal ID, Poteau R, Maron L. DFT study of the Ring Opening Polymerization of ε-caprolactone by grafted lanthanide complexes: 1—Effect of the grafting mode on the reactivity of borohydride complexes. Dalton Trans 2011; 40:11211-27. [DOI: 10.1039/c1dt10566c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Arbaoui A, Redshaw C, Sanchez-Ballester NM, Elsegood MR, Hughes DL. Bimetallic copper(II) and zinc(II) complexes of acyclic Schiff base ligands derived from amino acids. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.08.043] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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47
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