1
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Petrus R, Kowaliński A, Lis T. Recycling primary lithium batteries using a coordination chemistry approach: recovery of lithium and manganese residues in the form of industrially important materials. Dalton Trans 2024; 53:7450-7469. [PMID: 38592737 DOI: 10.1039/d4dt00648h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
In this study, we have investigated the potential use of post-consumer primary lithium metal batteries (LMBs) commonly used in portable electronic devices to recover lithium and manganese in the form of industrially important materials. A direct reaction of lithium-containing electronic waste with a naturally sourced ester, methyl salicylate, combined with a wide range of aliphatic alcohols has been used as a general method for recovering lithium in the form of lithium aryloxides of different nuclearities [Li(OAr)(HOMe)2] (1), [Li(OAr)(HOAr)] (2), [Li(OAr)(HOEt)]2 (3), [Li(OAr)(H2O)]2 (4), [Li4(OAr)4(EGME)2] (5), [Li6(OAr)6] (6-8) for ArOH = methyl salicylate (1, 2, 4, 6), ethyl salicylate (3, 7), 2-methoxyethyl salicylate (5, 8), and EGME = 2-methoxyethanol. The hydrolysis of 7 was then used to synthesize lithium salicylate [Li(Sal)(H2O)]n (10), which is an important antioxidant in the production of oils and grease. The discharged cathode material of Li-MnO2 batteries was investigated as a source from which LiClO4, Li2CO3, LiMn2O4, and Mn2O3 can be recovered by means of water-alcohol extraction or calcination. Particular emphasis was placed on the detailed characterization of all battery components and their decomposition products. LMBs were completely recycled for the first time, and materials were recovered from the cathode and the anode.
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Affiliation(s)
- Rafał Petrus
- Faculty of Chemistry, Wrocław University of Science and Technology, 23 Smoluchowskiego, 50-370 Wrocław, Poland.
| | - Adrian Kowaliński
- Faculty of Chemistry, Wrocław University of Science and Technology, 23 Smoluchowskiego, 50-370 Wrocław, Poland.
| | - Tadeusz Lis
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
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2
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Buchard A, Davidson MG, Gobius du Sart G, Jones MD, Kociok-Köhn G, McCormick SN, McKeown P. Unexpected Periodicity in Cationic Group 5 Initiators for the Ring-Opening Polymerization of Lactones. Inorg Chem 2024; 63:27-38. [PMID: 38118120 PMCID: PMC10777398 DOI: 10.1021/acs.inorgchem.3c03854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 11/23/2023] [Accepted: 12/04/2023] [Indexed: 12/22/2023]
Abstract
ε-Caprolactone (ε-CL) adducts of cationic, amine tris(phenolate)-supported niobium(V) and tantalum(V) ethoxides initiate the ring-opening polymerization of lactones. The Ta(V) species prepared and applied catalytically herein exhibits higher activity in the ring-opening polymerization (ROP) of ε-caprolactone than the previously reported, isostructural Nb(V) complex, contradicting literature comparisons of Nb(V)- and Ta(V)-based protocols. Both systems also initiate the ROP of δ-valerolactone and rac-β-butyrolactone, kinetic studies confirming retention of higher activity by the Ta congener. Polymerizations of rac-β-butyrolactone and δ-valerolactone were previously unrealized under Group V- or Ta-mediated conditions, respectively, although the former has afforded only low molecular weight, cyclic poly-3-hydroxybutyrate. Cationic ethoxo-Nb(V) and -Ta(V) δ-valerolactone adducts are also reported, demonstrating the facility of δ-valerolactone as a ligand and the generality of the synthetic method. Both δ-valerolactone-bearing complexes initiate the ROP of ε-caprolactone, δ-valerolactone, and rac-β-butyrolactone. Accordingly, we have elucidated trends in reactivity and investigated the initiation mechanism for such systems, the insertion event being predicated upon intramolecular nucleophilic attack on the coordinated lactone by the adjacent alkoxide moiety. This mechanism enables quantitative, stoichiometric installation of a single monomer residue distinct from the bulk of the polymer chain, and permits modification of polymer properties via both manipulation of the molecular architecture and tuning of the polymerization kinetics, and thus dispersity, through hitherto inaccessible independent control of the initiation event.
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Affiliation(s)
- Antoine Buchard
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, United Kingdom
- Department
of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Matthew G. Davidson
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, United Kingdom
- Department
of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | | | - Matthew D. Jones
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, United Kingdom
- Department
of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Gabriele Kociok-Köhn
- Material
and Chemical Characterization and Analysis Facility (MC), University of Bath, Bath BA2 7AY, United Kingdom
| | - Strachan N. McCormick
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, United Kingdom
- Department
of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Paul McKeown
- Department
of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
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3
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Buchard A, Davidson MG, Gobius du Sart G, Jones MD, Kociok-Köhn G, McCormick SN, Mckeown P. Coordination of ε-Caprolactone to a Cationic Niobium(V) Alkoxide Complex: Fundamental Insight into Ring-Opening Polymerization via Coordination-Insertion. Inorg Chem 2023; 62:15688-15699. [PMID: 37695575 PMCID: PMC10523432 DOI: 10.1021/acs.inorgchem.3c02491] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Indexed: 09/12/2023]
Abstract
We report three niobium-based initiators for the catalytic ring-opening polymerization (ROP) of ε-caprolactone, exhibiting good activity and molecular weight control. In particular, we have prepared on the gram-scale and fully characterized a monometallic cationic alkoxo-Nb(V) ε-caprolactone adduct representing, to the best of our knowledge, an unprecedented example of a metal complex with an intact lactone monomer and a functional ROP-initiating group simultaneously coordinated at the metal center. At 80 °C, all three systems initiate the immortal solution-state ROP of ε-caprolactone via a coordination-insertion mechanism, which has been confirmed through experimental studies, and is supported by computational data. Natural bond orbital calculations further indicate that polymerization may necessitate isomerization about the metal center between the alkoxide chain and the coordinated monomer. The observations made in this work are expected to inform mechanistic understanding both of amine tris(phenolate)-supported metal alkoxide ROP initiators, including various highly stereoselective systems for the polymerization of lactides and of coordination-insertion-type ROP protocols more broadly.
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Affiliation(s)
- Antoine Buchard
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, U.K.
- Department
of Chemistry, University of Bath, Bath BA2 7AY, U.K.
| | - Matthew G. Davidson
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, U.K.
- Department
of Chemistry, University of Bath, Bath BA2 7AY, U.K.
| | | | - Matthew D. Jones
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, U.K.
- Department
of Chemistry, University of Bath, Bath BA2 7AY, U.K.
| | - Gabriele Kociok-Köhn
- Material
and Chemical Characterization and Analysis Facility (MC2), University of Bath, Bath BA2 7AY, U.K.
| | - Strachan N. McCormick
- Institute
for Sustainability, University of Bath, Bath BA2 7AY, U.K.
- Department
of Chemistry, University of Bath, Bath BA2 7AY, U.K.
| | - Paul Mckeown
- Department
of Chemistry, University of Bath, Bath BA2 7AY, U.K.
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4
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Buchard A, Chuck CJ, Davidson MG, Gobius du Sart G, Jones MD, McCormick SN, Russell AD. A Highly Active and Selective Zirconium-Based Catalyst System for the Industrial Production of Poly(lactic acid). ACS Catal 2023; 13:2681-2695. [PMID: 36846823 PMCID: PMC9942235 DOI: 10.1021/acscatal.2c05690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 01/20/2023] [Indexed: 02/10/2023]
Abstract
The biodegradable, aliphatic polyester poly(lactic acid), PLA, is a leading bio-based alternative to petrochemical-derived plastic materials across a range of applications. Widely reported in the available literature as a benchmark for PLA production via the bulk ring-opening polymerization of lactides is the use of divalent tin catalysts, and particularly tin(II) bis(2-ethylhexanoate). We present an alternative zirconium-based system that combines an inexpensive Group IV metal with the robustness, high activity, control, and designed compatibility with existing facilities and processes, that are required for industrial use. We have carried out a comprehensive kinetic study and applied a combined experimental and theoretical approach to understanding the mechanism by which the polymerization of lactide proceeds in the presence of this system. In the laboratory-scale (20 g) polymerization of recrystallized racemic d,l-lactide (rac-lactide), we have measured catalyst turnover frequencies up to at least 56,000 h-1, and confirmed the reported protocols' resistance toward undesirable epimerization, transesterification, and chain scission processes, deleterious to the properties of the polymer product. Further optimization and scale-up under industrial conditions have confirmed the relevance of the catalytic protocol to the commercial production of melt-polymerized PLA. We were able to undertake the efficient preparation of high-molecular-weight PLA on the 500-2000 g scale, via the selective and well-controlled polymerization of commercial polymer-grade l-lactide under challenging, industrially relevant conditions, and at metal concentrations as low as 8-12 ppm Zr by weight ([Zr] = 1.3 × 10-3 to 1.9 × 10-3 mol %). Under those conditions, a catalyst turnover number of at least 60,000 was attained, and the activity of the catalyst was comparable to that of tin(II) bis(2-ethylhexanoate).
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Affiliation(s)
- Antoine Buchard
- Institute
for Sustainability, University of Bath, BathBA2 7AY, U.K.,Department
of Chemistry, University of Bath, BathBA2 7AY, U.K.
| | - Christopher J. Chuck
- Institute
for Sustainability, University of Bath, BathBA2 7AY, U.K.,Department
of Chemical Engineering, University of Bath, BathBA2 7AY, U.K.
| | - Matthew G. Davidson
- Institute
for Sustainability, University of Bath, BathBA2 7AY, U.K.,Department
of Chemistry, University of Bath, BathBA2 7AY, U.K.,
| | | | - Matthew D Jones
- Institute
for Sustainability, University of Bath, BathBA2 7AY, U.K.,Department
of Chemistry, University of Bath, BathBA2 7AY, U.K.
| | - Strachan N. McCormick
- Institute
for Sustainability, University of Bath, BathBA2 7AY, U.K.,Department
of Chemistry, University of Bath, BathBA2 7AY, U.K.,
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5
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N-alkyl-β-ketoiminate zinc complexes: Synthesis, structure, and reactivity in ring-opening polymerization of lactide. Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2022.121253] [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]
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6
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Rentero C, Damián J, Medel A, Fernández-Millán M, Rusconi Y, Talarico G, Cuenca T, Sessini V, Mosquera MEG. Ring-Opening Polymerization of L-Lactide Catalyzed by Potassium-Based Complexes: Mechanistic Studies. Polymers (Basel) 2022; 14:polym14152982. [PMID: 35893946 PMCID: PMC9329769 DOI: 10.3390/polym14152982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 07/18/2022] [Accepted: 07/20/2022] [Indexed: 02/05/2023] Open
Abstract
Two non-toxic potassium compounds, 1 and 2, with a commercial oximate ligand have been prepared and fully spectroscopically characterized. Their activity as catalysts for the ring-opening polymerization (ROP) process of LLA has been studied, showing that they are extremely active and able to polymerize the monomer in a few minutes. For derivative 2, the presence of a crown ether in the potassium coordination sphere affects the nuclearity of the compound and consequently its solubility, with both aspects having an influence in the polymerization process. Detailed studies of the polymerization mechanism have been performed, and an unusual anionic mechanism was observed in absence of a co-initiator. Indeed, the monomer deprotonation generates a lactide enolate, which initiates the polymerization propagation. On the contrary, when a 1:1 ratio of cat:BnOH is used, a mixture of mechanisms is observed, the anionic mechanism and the activated monomer one, while from a cat:BnOH ratio of 1:2 and over, only the activated monomer mechanism is observed.
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Affiliation(s)
- Christian Rentero
- Department of Organic and Inorganic Chemistry, Institute of Chemical Research “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, 28871 Madrid, Spain; (C.R.); (J.D.); (A.M.); (M.F.-M.); (T.C.)
| | - Jesús Damián
- Department of Organic and Inorganic Chemistry, Institute of Chemical Research “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, 28871 Madrid, Spain; (C.R.); (J.D.); (A.M.); (M.F.-M.); (T.C.)
| | - Asier Medel
- Department of Organic and Inorganic Chemistry, Institute of Chemical Research “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, 28871 Madrid, Spain; (C.R.); (J.D.); (A.M.); (M.F.-M.); (T.C.)
| | - María Fernández-Millán
- Department of Organic and Inorganic Chemistry, Institute of Chemical Research “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, 28871 Madrid, Spain; (C.R.); (J.D.); (A.M.); (M.F.-M.); (T.C.)
| | - Yolanda Rusconi
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli Federico II, Via Cintia, 80124 Napoli, Italy; (Y.R.); (G.T.)
| | - Giovanni Talarico
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli Federico II, Via Cintia, 80124 Napoli, Italy; (Y.R.); (G.T.)
| | - Tomás Cuenca
- Department of Organic and Inorganic Chemistry, Institute of Chemical Research “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, 28871 Madrid, Spain; (C.R.); (J.D.); (A.M.); (M.F.-M.); (T.C.)
| | - Valentina Sessini
- Department of Organic and Inorganic Chemistry, Institute of Chemical Research “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, 28871 Madrid, Spain; (C.R.); (J.D.); (A.M.); (M.F.-M.); (T.C.)
- Correspondence: (V.S.); (M.E.G.M.)
| | - Marta E. G. Mosquera
- Department of Organic and Inorganic Chemistry, Institute of Chemical Research “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, 28871 Madrid, Spain; (C.R.); (J.D.); (A.M.); (M.F.-M.); (T.C.)
- Correspondence: (V.S.); (M.E.G.M.)
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7
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Selective alcoholysis of lactide catalyzed by bulky Lewis pairs of tris(pentafluorophenyl)borane and phosphines. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Dong X, Robinson JR. The versatile roles of neutral donor ligands in tuning catalyst performance for the ring-opening polymerization of cyclic esters. NEW J CHEM 2022. [DOI: 10.1039/d1nj02694a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The use of neutral donor ligands is an effective strategy to modify catalyst structure and performance in the synthesis of sustainable polymers through the ring-opening polymerization (ROP) of cyclic esters.
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Affiliation(s)
- Xiang Dong
- Department of Chemistry, Brown University, 324 Brook St. Providence, RI 02912, USA
| | - Jerome R. Robinson
- Department of Chemistry, Brown University, 324 Brook St. Providence, RI 02912, USA
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9
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Petrus R, Utko J, Petrus JK, Awashra M, Lis T. Use of group 13 aryloxides for the synthesis of green chemicals and oxide materials. Dalton Trans 2022; 51:4135-4152. [DOI: 10.1039/d1dt03777c] [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
In this work, group 13 metal aryloxides [Al(MesalO)3] (1), [Me2Ga(MesalO)]2 (2), [AlLi3(MesalO)6] (3) and [Me2GaLi(MesalO)2(THF)] (4), were obtained by reaction of methyl salicylate (MesalOH) with group-13 alkyls MMe3 (for M...
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10
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Zhou Y, Nichol GS, Garden JA. Lithium Half‐Salen Complexes: Synthesis, Structural Characterization and Studies as Catalysts for
rac
‐Lactide Ring‐Opening Polymerization. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100981] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yali Zhou
- EaStCHEM School of Chemistry University of Edinburgh Edinburgh EH9 3FJ UK
| | - Gary S. Nichol
- EaStCHEM School of Chemistry University of Edinburgh Edinburgh EH9 3FJ UK
| | - Jennifer A. Garden
- EaStCHEM School of Chemistry University of Edinburgh Edinburgh EH9 3FJ UK
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11
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Gentner TX, Mulvey RE. Alkali-Metal Mediation: Diversity of Applications in Main-Group Organometallic Chemistry. Angew Chem Int Ed Engl 2021; 60:9247-9262. [PMID: 33017511 PMCID: PMC8247348 DOI: 10.1002/anie.202010963] [Citation(s) in RCA: 95] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Indexed: 12/23/2022]
Abstract
Organolithium compounds have been at the forefront of synthetic chemistry for over a century, as they mediate the synthesis of myriads of compounds that are utilised worldwide in academic and industrial settings. For that reason, lithium has always been the most important alkali metal in organometallic chemistry. Today, that importance is being seriously challenged by sodium and potassium, as the alkali-metal mediation of organic reactions in general has started branching off in several new directions. Recent examples covering main-group homogeneous catalysis, stoichiometric organic synthesis, low-valent main-group metal chemistry, polymerization, and green chemistry are showcased in this Review. Since alkali-metal compounds are often not the end products of these applications, their roles are rarely given top billing. Thus, this Review has been written to alert the community to this rising unifying phenomenon of "alkali-metal mediation".
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Affiliation(s)
- Thomas X. Gentner
- Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Robert E. Mulvey
- Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
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12
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Elkurtehi AI, Kerton FM. Synthesis of amino-phenolate manganese complexes and their catalytic activity in carbon dioxide activation and oxidation reactions. CAN J CHEM 2021. [DOI: 10.1139/cjc-2020-0348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two manganese(III) compounds were studied as catalysts for the reaction of carbon dioxide with propylene oxide, styrene oxide, and cyclohexene oxide, and formed cyclic carbonate products selectively under solvent free conditions in the presence of an ionic co-catalyst such as TBAB or PPNCl. Variable temperature kinetic studies allowed the activation energy for propylene carbonate formation to be determined (64 kJ mol−1). The catalysts showed good stability in these reactions and overall turnover numbers (TON) of up to 6000 were observed. The complexes showed low activity for the aerobic oxidation of 4-methyoxybenzylalcohol to the corresponding aldehyde, achieving up to 40% conversion in 72 h. However, near quantitative conversion of 1,2-diphenyl-2-methoxyethanol to provide up to 90% yield of benzaldehyde could be achieved over the course of 5 days. Both complexes showed similar reactivity in the two catalytic processes, and this is likely due to the weakly coordinating nature of the pendant donor within the tetradentate ligand.
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Affiliation(s)
- Ali I. Elkurtehi
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
| | - Francesca M. Kerton
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, NL, A1B 3X7, Canada
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13
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Gentner TX, Mulvey RE. Alkalimetall‐Mediatoren: Vielfältige Anwendungen in der metallorganischen Chemie der Hauptgruppenelemente. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010963] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Thomas X. Gentner
- Department of Pure and Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
| | - Robert E. Mulvey
- Department of Pure and Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
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14
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Potassium N-arylbenzimidates as readily accessible and benign (pre)catalysts for the ring opening polymerization of ε-CL and L-LA. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111280] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Petrus R, Fałat P, Sobota P. Use of lithium aryloxides as promoters for preparation of α-hydroxy acid esters. Dalton Trans 2020; 49:866-876. [PMID: 31858102 DOI: 10.1039/c9dt03631h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
In this work, a hexanuclear lithium compound, [Li6(MesalO)6] (1), supported by a chelating ligand, namely methyl salicylato (MesalOH), was used as a precursor for preparation of the monomeric lithium aryloxides [Li(MesalO)(MesalOH)] (2) and [Li(MesalO)(MeOH)2] (3) via reactions with MesalOH or MeOH. These aryloxides were characterized by single-crystal X-ray diffraction, and spectroscopic and other analytical methods. The diffusion-ordered 1H NMR measurements revealed the retention of solid-state structures of 1 and 2 in THF-d8 solution. Experimental data obtained for 3 showed its decomposition into compound 1 and free MeOH. Compound 1 generated from 3 was also used as a catalyst for the alcoholysis of l-lactide (l-LA) and glycolide (GA) for the preparation of α-hydroxy acid esters. We established that during methanolysis in the presence of 1, l-LA was selectively transformed into methyl (S,S)-O-lactyllactate (MeL2), and GA was converted to methyl glycolate (MeG1) and oligoglycolate esters MeGn (n = 2, 3, and 4).
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Affiliation(s)
- Rafał Petrus
- Faculty of Chemistry, Wrocław University of Science and Technology, 23 Smoluchowskiego, 50-370 Wrocław, Poland.
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16
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Devaine-Pressing K, Oldenburg FJ, Menzel JP, Springer M, Dawe LN, Kozak CM. Lithium, sodium, potassium and calcium amine-bis(phenolate) complexes in the ring-opening polymerization of rac-lactide. Dalton Trans 2020; 49:1531-1544. [PMID: 31930245 DOI: 10.1039/c9dt04561a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Compounds of Li, Na, K and Ca of a tetradentate amino-bis(phenolato) ligand were prepared. Bimetallic compounds formulated as M2[L](THF)n (where M = Na, n = 1 (1·THF) or Li, n = 1 (2·THF)) were synthesized via the reaction of H2[L] (where [L] = 2-pyridylmethylamino-N,N-bis(2-methylene-4-methoxy-6-tert-butylphenolato) with sodium hydride or n-butyllithium, respectively, in THF. Monometallic complexes MH[L](THF)n (where M = Na, n = 1 (3·THF), Li, n = 0 (4) and K, n = 0 (5)) were obtained by reaction of H2[L] with MN(SiMe3)2 where M = Na, Li, or K. Calcium complex Ca[L](THF) (6·THF) was synthesized in two ways; reaction of Na2[L] with calcium iodide in THF, and reaction of Ca[N(SiMe3)2]2 with H2[L] in toluene. Compounds 1-6 exhibit activity for rac-lactide polymerization under melt and solution conditions. Moderate control of polymer molecular weights was achieved in toluene, whereas polydisperse polymer was obtained under solvent free conditions. MALDI-TOF MS analysis of the polymer end groups revealed a predominantly cyclic nature for the polylactides.
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Affiliation(s)
- Katalin Devaine-Pressing
- Department of Chemistry, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X7, Canada.
| | - Fabio J Oldenburg
- Department of Chemistry, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X7, Canada.
| | - Jan P Menzel
- Department of Chemistry, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X7, Canada.
| | - Maximilian Springer
- Department of Chemistry, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X7, Canada.
| | - Louise N Dawe
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada
| | - Christopher M Kozak
- Department of Chemistry, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X7, Canada.
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17
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McKeown P, Román-Ramírez LA, Bates S, Wood J, Jones MD. Zinc Complexes for PLA Formation and Chemical Recycling: Towards a Circular Economy. CHEMSUSCHEM 2019; 12:5233-5238. [PMID: 31714680 DOI: 10.1002/cssc.201902755] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 11/01/2019] [Indexed: 05/14/2023]
Abstract
A series of ZnII complexes, based on propylenediamine Schiff bases, have been prepared and fully characterized. X-ray crystallography and NMR spectroscopy identified significant differences in the solid and solution state for the ZnII species. All complexes have been applied to the ring-opening polymerization of l-lactide with emphasis on industrial conditions. High conversion and good molecular weight control were generally achievable for Zn(A-D)2 , and high-molecular-weight poly(lactic acid) (PLA) was prepared in 1 min at a 10 000:1:33 [lactide]/[Zn]/[BnOH] loading. The more active ZnII catalysts were also applied to PLA degradation to alkyl lactate under mild conditions. Zn(A-B)2 demonstrated high activity and selectivity in this process with PLA being consumed within 1 h at 50 °C. Zn(C-D)2 were shown to be less active, and these observations can be related to the catalysts' structure and the degradation mechanism. Initial results for the degradation of poly(ethylene terephthalate) and mixed feeds are also presented, highlighting the broader applicability of the systems presented.
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Affiliation(s)
- Paul McKeown
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Luis A Román-Ramírez
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Samuel Bates
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Joseph Wood
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Matthew D Jones
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
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18
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19
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Liu Y, Dawe LN, Kozak CM. Bimetallic and trimetallic zinc amino-bis(phenolate) complexes for ring-opening polymerization of rac-lactide. Dalton Trans 2019; 48:13699-13710. [DOI: 10.1039/c9dt03118a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Di- and trinuclear zinc complexes of an amino-bis(phenolate) ligand show good lactide polymerization activity in both solution and melt.
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Affiliation(s)
- Yi Liu
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada
| | - Louise N. Dawe
- Department of Chemistry and Biochemistry
- Wilfrid Laurier University
- Waterloo
- Canada
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20
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Harinath A, Bhattacharjee J, Sarkar A, Panda TK. Alkali metal complex-mediated ring-opening polymerization of rac-LA, ε-caprolactone, and δ-valerolactone. NEW J CHEM 2019. [DOI: 10.1039/c9nj01130g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Catalytic ring opening polymerization (ROP) of rac-lactide, ε-caprolactone, and δ-valerolactone using alkali metal (Li, Na, K) complexes as competent catalysts are reported.
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Affiliation(s)
- Adimulam Harinath
- Department of Chemistry
- Indian Institute of Technology Hyderabad Kandi – 502 285
- Sangareddy
- India
| | - Jayeeta Bhattacharjee
- Department of Chemistry
- Indian Institute of Technology Hyderabad Kandi – 502 285
- Sangareddy
- India
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd
- Bangalore – 560 100
- India
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad Kandi – 502 285
- Sangareddy
- India
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Harinath A, Bhattacharjee J, Sarkar A, Nayek HP, Panda TK. Ring Opening Polymerization and Copolymerization of Cyclic Esters Catalyzed by Group 2 Metal Complexes Supported by Functionalized P–N Ligands. Inorg Chem 2018; 57:2503-2516. [DOI: 10.1021/acs.inorgchem.7b02847] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Adimulam Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi 502 285, Sangareddy, Telangana, India
| | - Jayeeta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi 502 285, Sangareddy, Telangana, India
| | - Alok Sarkar
- Momentive Performance
Materials Pvt. Ltd., Bangalore 560 100, India
| | - Hari Pada Nayek
- Department of Applied Chemistry, Indian Institute of Technology (ISM), Dhanbad 826 004, Jharkhand, India
| | - Tarun K. Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi 502 285, Sangareddy, Telangana, India
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Tian LL, Wu BB, Wang ZX. Crown ether complexes of sodium and potassium 2-(benzotriazol-2-yl)phenolates: Synthesis and catalysis towards the ring-opening polymerization of rac-lactide. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2017. [DOI: 10.1080/10601325.2017.1381925] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Lu-Lu Tian
- Department of Chemistry, University of Science and Technology of China and CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui, P. R. China
| | - Bing-Bing Wu
- Department of Chemistry, University of Science and Technology of China and CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui, P. R. China
| | - Zhong-Xia Wang
- Department of Chemistry, University of Science and Technology of China and CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, P. R. China
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25
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Keram M, Ma H. Ring-opening polymerization of lactide, ε
-caprolactone and their copolymerization catalyzed by β
-diketiminate zinc complexes. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.3893] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Maryam Keram
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry; School of Chemistry and Molecular Engineering, East China University of Science and Technology; 130 Meilong Road Shanghai 200237 China
| | - Haiyan Ma
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry; School of Chemistry and Molecular Engineering, East China University of Science and Technology; 130 Meilong Road Shanghai 200237 China
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26
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Rajendran NM, Xi Y, Zhang W, Sun Y, Sun W. Lithium Quinolyl‐Amidinates Efficiently Promoting Ring‐Opening Polymerization of ε‐Caprolactone: Synthesis and
7
Li NMR Spectroscopic Studies. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700135] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Natesan Mannangatti Rajendran
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
| | - Yanxia Xi
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
| | - Wenjuan Zhang
- School of Materials Science and Engineering Beijing Institute of Fashion Technology 100029 Beijing China
| | - Yang Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
| | - Wen‐Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
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27
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Yao C, Yang Y, Xu S, Ma H. Potassium complexes supported by monoanionic tetradentate amino-phenolate ligands: synthesis, structure and catalysis in the ring-opening polymerization of rac-lactide. Dalton Trans 2017; 46:6087-6097. [PMID: 28430280 DOI: 10.1039/c7dt00812k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of potassium complexes bearing monoanionic tetradentate amino-phenolate ligands, [LK]2 (L = {(2-R1)C6H4CH2N[(CH2)2R2]CH2(4-R4-6-R3)C6H2O-}, R1 = NMe2, R2 = NEt2, R3 = CPh3, R4 = Me (1); R1 = R2 = NEt2, R3 = CPh3, R4 = Me (2); R1 = NMe2, R2 = NEt2, R3 = R4 = cumyl (4); R1 = R2 = OMe, R3 = tBu, R4 = Me (6); L = (2-NMe2)C6H4CH2N[[CH2-(S)-1-butylpyrrolidinyl]CH2(4-Me-6-CPh3)C6H2O-] (3)), have been synthesized via reactions of KN(SiMe3)2 and 1 equiv. of the corresponding aminophenols. The solid-state structures of typical complexes 4 and 6 are determined via X-ray diffraction studies, which reveal the dinuclear nature of these complexes. By contrast, DOSY measurements of 1, 4 and 6 suggest that these complexes are monomeric in solution. It is noteworthy that the coordination chemistry of these potassium complexes is versatile, which is closely related to the nature of the ortho-substituent of the phenolate ring, as indicated by the results of the corresponding spectroscopic studies. In the presence of iPrOH, 1-4 and 6 could initiate the polymerization of 500 equiv. of rac-lactide to achieve high monomer conversions within several minutes but afford atactic PLAs with slightly isotactic-enriched microstructures (Pm = 0.58-0.60). Experimental results also demonstrated that a bulky trityl substituent at the ortho-position of the phenolate ring of the ligand framework is beneficial for the enhancement of the activities of these potassium complexes.
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Affiliation(s)
- Chenhui Yao
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
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28
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Wu BB, Tian LL, Wang ZX. Ring-opening polymerization of rac-lactide catalyzed by crown ether complexes of sodium and potassium iminophenoxides. RSC Adv 2017. [DOI: 10.1039/c7ra03394j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Crown ether complexes of sodium and potassium iminophenoxides were demonstrated to catalyze the stereoselective polymerization of rac-lactide.
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Affiliation(s)
- Bing-Bing Wu
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- Department of Chemistry
- University of Science and Technology of China
- Hefei
| | - Lu-Lu Tian
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- Department of Chemistry
- University of Science and Technology of China
- Hefei
| | - Zhong-Xia Wang
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- Department of Chemistry
- University of Science and Technology of China
- Hefei
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29
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Wu BB, Wang ZX. Crown ether complexes of potassium quinolin-8-olates: synthesis, characterization and catalysis toward the ring-opening polymerization of rac-lactide. RSC Adv 2017. [DOI: 10.1039/c7ra01186e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Crown ether complexes of potassium quinolin-8-olates were synthesized and demonstrated to catalyze the stereoselective polymerization of rac-lactide.
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Affiliation(s)
- Bing-Bing Wu
- CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry
- University of Science and Technology of China
- Hefei
- People's Republic of China
| | - Zhong-Xia Wang
- CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry
- University of Science and Technology of China
- Hefei
- People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
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30
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Zheng XX, Wang ZX. Synthesis of aluminum complexes supported by 2-(1,10-phenanthrolin-2-yl)phenolate ligands and their catalysis in the ring-opening polymerization of cyclic esters. RSC Adv 2017. [DOI: 10.1039/c7ra03831c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Phenanthroline-phenolate based N,N,O-chelate aluminum complexes were demonstrated to catalyze the ROP of ε-caprolactone, rac-lactide, and rac-β-butyrolactone, as well as their block copolymerization.
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Affiliation(s)
- Xiang-Xin Zheng
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- Department of Chemistry
- University of Science and Technology of China
- Hefei
| | - Zhong-Xia Wang
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- Department of Chemistry
- University of Science and Technology of China
- Hefei
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31
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Dai ZR, Yin CF, Wang C, Wu JC. Zinc bis-Schiff base complexes: Synthesis, structure, and application in ring-opening polymerization of rac-lactide. CHINESE CHEM LETT 2016. [DOI: 10.1016/j.cclet.2016.05.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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32
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Kan C, Ge J, Ma H. Aluminum methyl, alkoxide and α-alkoxy ester complexes supported by 6,6'-dimethylbiphenyl-bridged salen ligands: synthesis, characterization and catalysis for rac-lactide polymerization. Dalton Trans 2016; 45:6682-95. [PMID: 26974122 DOI: 10.1039/c5dt04633e] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The synthesis and characterization of aluminum alkyl and alkoxide complexes bearing racemic 6,6'-dimethylbiphenyl-bridged salen-type ligands, and their catalysis in the ring-opening polymerization (ROP) of rac-lactide are reported. Reactions of AlMe3 with various amounts of the proligands (6,6'-[(6,6'-dimethyl-[1,1'-biphenyl]-2,2'-diyl)bis(nitrylomethilidyne)]-bis(2-R(1)-4-R(2)-phenol): , R(1) = R(2) = Me; , R(1) = (t)Bu, R(2) = Me; , R(1) = R(2) = cumyl; , R(1) = Br, R(2) = (t)Bu) afforded the corresponding mono- and dinuclear aluminum methyl complexes [AlMe (), Al2Me4 ()]. Aluminum alkoxide complexes AlO(i)Pr (), AlOBn (), and α-alkoxy ester complexes Al(OCMe2CO2Me) (), Al[(S)-OCHMeCO2Me] () were prepared via in situ alcoholysis of the parent aluminum methyl complex with the corresponding alcohols. The molecular structures of mononuclear complexes , dinuclear complex , alkoxide complexes and α-alkoxy ester complexes were established by single-crystal X-ray diffraction studies. Two broad resonances at about 69-70 ppm and 25-41 ppm were observed in the (27)Al NMR spectra of complexes and , indicating the existence of both four- and five-coordinate aluminum centers in solution, which results from the dissociation of one N donor of the salen ligand, accompanied by an association and dissociation equilibrium of the carbonyl group of the α-alkoxy ester ligand to the aluminum center. Complex is also a rare example of an O-lactate model complex that mimics the first insertion of l-LA. All complexes were investigated for the ROP of rac-LA at 110 °C in toluene. The polymerization initiated by complexes in the presence of (i)PrOH showed living features, affording PLAs with narrow molecular weight distributions (PDIs = 1.03-1.05) and 65-73% isotacticities. Particularly, complex showed an "immortal" behavior for the polymerization of rac-LA in the presence of excess alcohol. Compared with the mononuclear counterparts, the tetra-coordinate dinuclear aluminum complexes enabled a few fold boosts in activity, but gave atactic PLAs with broadened PDIs.
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Affiliation(s)
- Chao Kan
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
| | - Jilei Ge
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
| | - Haiyan Ma
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
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33
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Duan YL, He JX, Wang W, Zhou JJ, Huang Y, Yang Y. Synthesis and characterization of dinuclear rare-earth complexes supported by amine-bridged bis(phenolate) ligands and their catalytic activity for the ring-opening polymerization of l-lactide. Dalton Trans 2016; 45:10807-20. [PMID: 27294827 DOI: 10.1039/c6dt01486k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of amine-bridged bis(phenolate) protio-ligands N,N-bis(3,5-di-tert-butyl-2-hydroxybenzyl)aminoacetic acid (L(1)-H3) and N,N-bis[3,5-bis(α,α'-dimethylbenzyl)-2-hydroxybenzyl]aminoacetic acid (L(2)-H3), with 1 equiv. M[N(SiMe3)2]3 (M = La, Nd, Sm, Gd, Y) in THF at room temperature yielded the neutral rare-earth complexes [M2(L)2(THF)4] (L = L(1), M = La (), Nd (), Sm (), Gd (), Y (); L = L(2), M = La (), Nd (), Sm (), Gd (), Y ()). All of these complexes were characterized by single-crystal X-ray diffraction, elemental analysis and in the case of yttrium and lanthanum complexes, (1)H NMR spectroscopy. The molecular structure of revealed dinuclear species in which the eight-coordinate lanthanum centers were bonded to two oxygen atoms of two THF molecules, to three oxygen atoms and one nitrogen atom of one L(1) ligand, and two oxygen atoms of the carboxyl group of another. Complexes were also dinuclear species containing seven-coordinate metal centers similar to , albeit with bonding to one rather than two carboxyl group oxygens of another ligand. Further treatment of with excess benzyl alcohol provided dinuclear complex [La2(L(1))2(BnOH)6] (), in which each lanthanum ion is eight-coordinate, bonded to three oxygen atoms and one nitrogen atom of one ligand, three oxygen atoms of three BnOH molecules, as well as one oxygen atom of bridging carboxyl group of the other ligand. In the presence of BnOH, complexes efficiently catalyzed the ring-opening polymerization of l-lactide in a controlled manner and gave polymers with relatively narrow molecular weight distributions. The kinetic and mechanistic studies associated with the ROP of l-lactide using /BnOH initiating system have been performed.
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Affiliation(s)
- Yu-Lai Duan
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Jia-Xuan He
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Wei Wang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Jing-Jing Zhou
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Yong Huang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Ying Yang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
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Reprint of Structural characterization of a tetrametallic diamine-bis(phenolate) complex of lithium and synthesis of a related bismuth complex. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.03.049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Ou HW, Lo KH, Du WT, Lu WY, Chuang WJ, Huang BH, Chen HY, Lin CC. Synthesis of Sodium Complexes Supported with NNO-Tridentate Schiff Base Ligands and Their Applications in the Ring-Opening Polymerization of L-Lactide. Inorg Chem 2016; 55:1423-32. [PMID: 26828572 DOI: 10.1021/acs.inorgchem.5b02043] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of sodium complexes bearing NNO-tridentate Schiff base ligands with an N-pendant arm were synthesized and used as catalysts for the ring-opening polymerization of L-lactide (L-LA). Electronic effects of ancillary ligands coordinated by sodium complexes substantially influence the catalysis, and ligands with electron-donating groups increase the catalytic activity of the sodium complexes for catalyzing L-LA polymerization. In particular, a sodium complex bearing a 4-methoxy group has the highest activity with conversion up to 95% within 30 s at 0 °C and a low polydispersity index of 1.13, whereas the 4-bromo group showed the poorest performance with regard to the catalytic rate of L-LA polymerization in the presence of benzyl alcohol (BnOH). (1)H NMR pulsed-gradient spin-echo diffusion experiments and single-crystal X-ray analyses showed that sodium complexes [L(H)Na(THF)]2 and [L(4-Cl)Na(THF)]2 were dinuclear species in both solution and the solid state. The kinetic results indicated a first-order dependence on each of [[L(4-Cl)Na]2], [l-LA], and [BnOH].
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Affiliation(s)
- Hsiu-Wei Ou
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Kai-Hsuan Lo
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wei-Ting Du
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wei-Yi Lu
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wan-Jung Chuang
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University , Kaohsiung 80708, Taiwan, Republic of China
| | - Bor-Hunn Huang
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University , Kaohsiung 80708, Taiwan, Republic of China
| | - Chu-Chieh Lin
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
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36
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McKeown P, Davidson MG, Lowe JP, Mahon MF, Thomas LH, Woodman TJ, Jones MD. Aminopiperidine based complexes for lactide polymerisation. Dalton Trans 2016; 45:5374-87. [DOI: 10.1039/c5dt04695e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A series of new ligands based on a 2-(aminomethyl)piperidine motif have been prepared. An interesting diversity in structure is observed, all complexes have been trialled for the polymerisation of rac-lactide.
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Affiliation(s)
- P. McKeown
- Doctoral Training Centre in Sustainable Chemical Technologies
- University of Bath
- Bath BA2 7AY
- UK
- Department of Chemistry
| | - M. G. Davidson
- Doctoral Training Centre in Sustainable Chemical Technologies
- University of Bath
- Bath BA2 7AY
- UK
- Department of Chemistry
| | - J. P. Lowe
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
| | - M. F. Mahon
- Crystallography Centre
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
| | - L. H. Thomas
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
| | - T. J. Woodman
- Doctoral Training Centre in Sustainable Chemical Technologies
- University of Bath
- Bath BA2 7AY
- UK
| | - M. D. Jones
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
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37
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Dai Z, Sun Y, Xiong J, Pan X, Tang N, Wu J. Simple sodium and potassium phenolates as catalysts for highly isoselective polymerization of rac-lactide. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01194a] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of simple sodium and potassium phenolates can highly isoselectively catalyze the polymerization of rac-lactide (with a high Pm value of up to 0.89).
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Affiliation(s)
- Zhongran Dai
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou 730000
- People's Republic of China
| | - Yangyang Sun
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou 730000
- People's Republic of China
| | - Jiao Xiong
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou 730000
- People's Republic of China
| | - Xiaobo Pan
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou 730000
- People's Republic of China
| | - Ning Tang
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou 730000
- People's Republic of China
| | - Jincai Wu
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou 730000
- People's Republic of China
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Sun Y, Xiong J, Dai Z, Pan X, Tang N, Wu J. Stereoselective Alkali-Metal Catalysts for Highly Isotactic Poly(rac-lactide) Synthesis. Inorg Chem 2015; 55:136-43. [PMID: 26684962 DOI: 10.1021/acs.inorgchem.5b02709] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A high degree of chain end control in the isoselective ring-opening polymerization (ROP) of rac-lactide is a challenging research goal. In this work, eight highly active sodium and potassium phenolates as highly isoselective catalysts for the ROP of rac-lactide are reported. The best isoselectivity value of Pm = 0.94 is achieved. The isoselective mechanism is chain-end control through the analysis of the stereoerrors in the microstructure of a final polymer; thus, isotactic multiblock structure polymers are obtained, and the highest melt point can reach 192.5 °C. The donating group in phenolate can clearly accelerate the ROP reaction, potassium complexes are more active than the analogous sodium complexes, and the big spacial hindrance of the ligand can decrease the activity. The high isoselectivities of these complexes mostly result from their sandwich structure constructed by the plane of the crown and the plane of the anthryl group.
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Affiliation(s)
- Yangyang Sun
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Jiao Xiong
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Zhongran Dai
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Xiaobo Pan
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Ning Tang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
| | - Jincai Wu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University , Lanzhou 730000, People's Republic of China
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39
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Drover MW, Murphy JN, Flogeras JC, Schneider CM, Dawe LN, Kerton FM. Structural characterization of a tetrametallic diamine-bis(phenolate) complex of lithium and synthesis of a related bismuth complex. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.07.071] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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40
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Gallegos C, Tabernero V, Mosquera MEG, Cuenca T, Cano J. Comparative Study of Lactide Polymerization with Lithium, Sodium, Potassium, Magnesium, Calcium, and Zinc Azonaphthoxide Complexes. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500818] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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Yang Y, Wang H, Ma H. Stereoselective Polymerization of rac-Lactide Catalyzed by Zinc Complexes with Tetradentate Aminophenolate Ligands in Different Coordination Patterns: Kinetics and Mechanism. Inorg Chem 2015; 54:5839-54. [PMID: 25996447 DOI: 10.1021/acs.inorgchem.5b00558] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of monomeric zinc silylamido complexes bearing [NNNO]-type tetradentate aminophenolate ligands, LZnN(SiMe3)2 [L = {(2-R(1))ArCH2N[(CH2)2R(2)]CH2(4-R(4)-6-R(3))C6H2O-}, R(1) = NMe2, R(2) = N(i)Pr2, R(3) = R(4) = Cl (1), R(3) = R(4) = cumyl (3); R(1) = NMe2, R(2) = NEt2, R(3) = R(4) = cumyl (2), R(3) = CPh3, R(4) = Me (4); R(1) = NEt2, R(2) = NEt2, R(3) = CPh3, R(4) = Me (5); R(1) = NMe2, R(2) = (S)-1-butylpyrrolidin-2-yl, R(3) = R(4) = cumyl (6), R(3) = CPh3, R(4) = Me (7)], have been synthesized via reactions of Zn[N(SiMe3)2]2 and 1 equiv of the corresponding aminophenols. The monomeric nature and versatile coordination patterns of these complexes in the solid state were further confirmed by X-ray diffraction studies on complexes 2, 3, 5, and 7. In complex 3, the N,N-diisopropylamino group on the pendant side arm does not coordinate to the metal center; only the remaining three donors of the aminophenolate ligand and the silylamido group interact with the zinc center. By contrast, in complexes 2, 5, and 7, the amino group of the aryl moiety does not coordinate to the metal center, while the amino group on the pendant side arm coordinates. At room temperature, the above-mentioned structural features of these complexes are retained in solution, as confirmed by (1)H NMR spectroscopy. Complexes 1-7 proved to be efficient initiators for the ring-opening polymerization of rac-lactide (rac-LA) at ambient temperature, and the polymerizations were better controlled in the presence of 2-propanol. The coordination pattern of the aminophenolate ligand exerted a significant influence on the stereoselectivity of the corresponding complex toward the polymerization of rac-LA, leading to the production of heterotactic biased polylactides (PLAs) by complexes 1 and 3 (Pm = 0.40-0.46) and moderately to highly isotactic PLAs by complexes 2 and 4-7 (Pm = 0.70-0.81). Detailed kinetic investigations revealed a first-order dependence on the monomer concentration for all complexes and different orders in the initiator concentration ranging from 1.78 to 1.81. The nature of the solvent as well as the molar ratio of the zinc complex and 2-propanol also displayed certain influence on the order of rac-LA polymerization in the initiator concentration. Factional orders of 1.80, 1.38, and 1.11 were obtained by using complex 5/(i)PrOH (1:1) in toluene and tetrahydrofuran and complex 5/(i)PrOH (1:2) in toluene, respectively. On the basis of DOSY and (1)H and (13)C NMR studies of zinc alkoxide model complexes "LZn(OCMe2COOMe)" as well as the fractional orders of 1.78-1.81 in the initiator concentration, activation/insertion processes likely involving more than one monomeric active species were then hypothesized.
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Affiliation(s)
- Yang Yang
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Haobing Wang
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Haiyan Ma
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
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42
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Dai Z, Sun Y, Xiong J, Pan X, Wu J. Alkali-Metal Monophenolates with a Sandwich-Type Catalytic Center as Catalysts for Highly Isoselective Polymerization of rac-Lactide. ACS Macro Lett 2015; 4:556-560. [PMID: 35596285 DOI: 10.1021/acsmacrolett.5b00209] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Highly isoselective ring-opening polymerization (ROP) of rac-lactide is a challenge for sodium and potassium complexes under mild conditions. In this work, three sodium and potassium complexes with a sandwich-type catalytic center are highly active catalysts for the polymerization of rac-lactide and show high isoselectivities with Pm values of 0.72-0.82. The best isoselectivity of Pm = 0.82 is the highest value for alkali-metal complexes under mild conditions. The molecular weights of the obtained PLA are close to the theoretical values, and the molecular weight distributions are narrow.
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Affiliation(s)
- Zhongran Dai
- State Key Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and
Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou 730000, Gansu, People’s Republic of China
| | - Yangyang Sun
- State Key Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and
Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou 730000, Gansu, People’s Republic of China
| | - Jiao Xiong
- State Key Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and
Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou 730000, Gansu, People’s Republic of China
| | - Xiaobo Pan
- State Key Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and
Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou 730000, Gansu, People’s Republic of China
| | - Jincai Wu
- State Key Laboratory of Applied
Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and
Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou 730000, Gansu, People’s Republic of China
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43
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Xiong J, Zhang J, Sun Y, Dai Z, Pan X, Wu J. Iso-selective ring-opening polymerization of rac-lactide catalyzed by crown ether complexes of sodium and potassium naphthalenolates. Inorg Chem 2015; 54:1737-43. [PMID: 25597469 DOI: 10.1021/ic502685f] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Two crown ether complexes of sodium and potassium naphthalenolates were synthesized and entirely characterized. The two complexes can iso-selectively catalyze the ring-opening polymerization (ROP) of rac-lactide at room temperature and afford polylactides with desired molecular weights and narrow PDIs; the best isotacticity (Pm) achieved was 0.73.
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Affiliation(s)
- Jiao Xiong
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou 730000, People's Republic of China
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44
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García-Valle FM, Estivill R, Gallegos C, Cuenca T, Mosquera MEG, Tabernero V, Cano J. Metal and Ligand-Substituent Effects in the Immortal Polymerization of rac-Lactide with Li, Na, and K Phenoxo-imine Complexes. Organometallics 2015. [DOI: 10.1021/om501000b] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Francisco M. García-Valle
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Spain
| | - Robert Estivill
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Spain
| | - Carlos Gallegos
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Spain
| | - Tomás Cuenca
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Spain
| | - Marta E. G. Mosquera
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Spain
| | - Vanessa Tabernero
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Spain
| | - Jesús Cano
- Departamento de Química
Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, 28871 Alcalá de Henares, Spain
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45
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Ghosh S, Chakraborty D, Varghese B. Group 1 salts of the imino(phenoxide) scaffold: Synthesis, structural characterization and studies as catalysts towards the bulk ring opening polymerization of lactides. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2014.10.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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46
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Ghosh S, Gowda RR, Jagan R, Chakraborty D. Gallium and indium complexes containing the bis(imino)phenoxide ligand: synthesis, structural characterization and polymerization studies. Dalton Trans 2015; 44:10410-22. [DOI: 10.1039/c5dt00811e] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A series of gallium and indium complexes containing the bis(imino)phenolate ligand framework were synthesized and completely characterized with different spectroscopic techniques.
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Affiliation(s)
- Swarup Ghosh
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
| | - Ravikumar R. Gowda
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
| | - Rajamony Jagan
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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47
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Kober E, Petrus R, Kocięcka P, Janas Z, Sobota P. Lithium diaminebis(aryloxido) complexes: Synthesis, structures and reactivity in l-lactide polymerization. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.10.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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48
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Alhashmialameer D, Ikpo N, Collins J, Dawe LN, Hattenhauer K, Kerton FM. Ring-opening polymerization of rac-lactide mediated by tetrametallic lithium and sodium diamino-bis(phenolate) complexes. Dalton Trans 2015; 44:20216-31. [DOI: 10.1039/c5dt03119b] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sodium complex contains interesting intramolecular η6-arene interaction and shows excellent catalytic behaviour for polymerization of lactide.
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Affiliation(s)
| | - Nduka Ikpo
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada A1B 3X7
| | - Julie Collins
- C-CART X-ray Diffraction Laboratory
- Memorial University of Newfoundland
- St. John's
- Canada
| | - Louise N. Dawe
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada A1B 3X7
- C-CART X-ray Diffraction Laboratory
| | - Karen Hattenhauer
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada A1B 3X7
| | - Francesca M. Kerton
- Department of Chemistry
- Memorial University of Newfoundland
- St. John's
- Canada A1B 3X7
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49
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Wang L, Kefalidis CE, Roisnel T, Sinbandhit S, Maron L, Carpentier JF, Sarazin Y. Structure vs 119Sn NMR Chemical Shift in Three-Coordinated Tin(II) Complexes: Experimental Data and Predictive DFT Computations. Organometallics 2014. [DOI: 10.1021/om5007566] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lingfang Wang
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
| | - Christos E. Kefalidis
- Laboratoire
de Physique et Chimie de Nano-objets, UMR 5215 CNRS−Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Thierry Roisnel
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
| | - Sourisak Sinbandhit
- Centre
Régional des Mesures Physiques de l’Ouest, Université de Rennes 1, 35042 Rennes Cedex, France
| | - Laurent Maron
- Laboratoire
de Physique et Chimie de Nano-objets, UMR 5215 CNRS−Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Jean-François Carpentier
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
| | - Yann Sarazin
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
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50
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Zhang J, Xiong J, Sun Y, Tang N, Wu J. Highly Iso-Selective and Active Catalysts of Sodium and Potassium Monophenoxides Capped by a Crown Ether for the Ring-Opening Polymerization of rac-Lactide. Macromolecules 2014. [DOI: 10.1021/ma502000y] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jinjin Zhang
- State Key
Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, College
of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Jiao Xiong
- State Key
Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, College
of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Yangyang Sun
- State Key
Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, College
of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Ning Tang
- State Key
Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, College
of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Jincai Wu
- State Key
Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, College
of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
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