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Mankaev BN, Karlov SS. Metal Complexes in the Synthesis of Biodegradable Polymers: Achievements and Prospects. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6682. [PMID: 37895663 PMCID: PMC10608263 DOI: 10.3390/ma16206682] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/05/2023] [Accepted: 10/10/2023] [Indexed: 10/29/2023]
Abstract
This review describes recent advances in the synthesis of homopolymers of lactide and related cyclic esters via ring-opening polymerization (ROP) in the presence of metal complexes based on group 1, 2, 4, 12, 13 and 14 metals. Particular attention is paid to the influence of the initiator structure on the properties of the obtaining homo- and copolymers. Also, a separate chapter is devoted to the study of metal complexes in the synthesis of copolymers of lactide and lactones. This review highlights the efforts made over the last ten years or so, and shows how main-group metals have received increasing attention in the field of the polymerization of lactide and related cyclic esters.
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Affiliation(s)
- Badma N. Mankaev
- Chemistry Department, Lomonosov Moscow State University, 119991 Moscow, Russia;
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, 119991 Moscow, Russia
| | - Sergey S. Karlov
- Chemistry Department, Lomonosov Moscow State University, 119991 Moscow, Russia;
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, 119991 Moscow, Russia
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2
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Mankaev BN, Hasanova LF, Churakov AV, Egorov MP, Karlov SS. Gallium (III) Complexes Based on Aminobisphenolate Ligands: Extremely High Active ROP-Initiators from Well-Known and Easily Accessible Compounds. Int J Mol Sci 2022; 23:ijms232415649. [PMID: 36555296 PMCID: PMC9779430 DOI: 10.3390/ijms232415649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022] Open
Abstract
We report herein the synthesis and full characterizations of the first examples of gallium complexes based on "privileged" aminobisphenolate ligands which are easily available. These complexes turned out to be extremely active in the ring-opening polymerization of ε-caprolactone even at room temperature and highly active in the ROP of L-lactide. The combination of factors such as the easy availability of these compounds and the supposedly low toxicity, together with the extremely high activity in ROP, allows us to consider these compounds as suitable for use on an industrial scale for the synthesis of biodegradable polymers for biomedical applications.
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Affiliation(s)
- Badma N. Mankaev
- Chemistry Department, Moscow State University, 119991 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, 119991 Moscow, Russia
| | - Leyla F. Hasanova
- Chemistry Department, Moscow State University, 119991 Moscow, Russia
| | - Andrei V. Churakov
- Institute of General and Inorganic Chemistry, Russian Academy of Science, 119991 Moscow, Russia
| | - Mikhail P. Egorov
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, 119991 Moscow, Russia
| | - Sergey S. Karlov
- Chemistry Department, Moscow State University, 119991 Moscow, Russia
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Science, 119991 Moscow, Russia
- Correspondence:
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3
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Glöckler E, Ghosh S, Schulz S. β-Diketiminate and β-Ketoiminate Metal Catalysts for Ring-Opening Polymerization of Cyclic Esters. POLYM REV 2022. [DOI: 10.1080/15583724.2022.2121837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Eduard Glöckler
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
| | - Swarup Ghosh
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
| | - Stephan Schulz
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
- Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany
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4
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Diaz C, Fu J, Soobrattee S, Cao L, Nyamayaro K, Goonesinghe C, Patrick BO, Mehrkhodavandi P. Comparison of Imine- and Phosphinimine-Supported Indium Complexes: Tuning the Reactivity for the Sequential and Simultaneous Copolymerization of Lactide and ε-Caprolactone. Inorg Chem 2022; 61:3763-3773. [PMID: 35171588 DOI: 10.1021/acs.inorgchem.2c00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Imine- and phosphinimine-supported indium complexes were used as catalysts in the polymerization of racemic lactide and ε-caprolactone as well as their copolymerization by the sequential and simultaneous addition of monomers. Tuning the electronics and sterics of the indium centers by either (i) changing the nature of the nitrogen donors and (ii) coordinating a hemilabile side group had a significant effect on the reactivity of the complexes, their stability, and their control in the synthesis of block copolymers. Specifically, the imine-supported complex (5) showed the highest activity in the homo- and copolymerization of the cyclic esters, in contrast to the phosphinimine-supported complex (7), which was significantly slower and less stable. The presence of morpholine and thiomorpholine hemilabile side groups either reduced the activity or prevented the formation of alkoxide complexes.
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Affiliation(s)
- Carlos Diaz
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Jane Fu
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Shazia Soobrattee
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Lirong Cao
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Kudzanai Nyamayaro
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Chatura Goonesinghe
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Brian O Patrick
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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5
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Stewart J, Fuchs M, Payne J, Driscoll O, Kociok-Köhn G, Ward BD, Herres-Pawlis S, Jones MD. Simple Zn(ii) complexes for the production and degradation of polyesters. RSC Adv 2022; 12:1416-1424. [PMID: 35425174 PMCID: PMC8979053 DOI: 10.1039/d1ra09087a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 12/17/2021] [Indexed: 11/21/2022] Open
Abstract
Nine new complexes based on thioether appended iminophenolate (ONS) ligands have been prepared and fully characterized in solution by NMR spectroscopy. Solid-state structures were also obtained for seven complexes. In solution, all complexes were monomeric. The complexes were highly active for the polymerization of purified rac-lactide ([M] : [Zn] : [BnOH] = 10 000 : 1 : 30 at 180 °C) reaching TOF values up to 250 000 h−1. The kinetics of the polymerization have been probed by in situ Raman spectroscopy. The rate of reaction was dramatically reduced using technical grade rac-lactide with increased initiator loading. To move towards a circular economy, it is vital that catalysts are developed to facilitate chemical recycling of commodity and emerging polymeric materials. In this vein, the complexes have been assessed for their ability to break down poly(lactic acid) and poly(ethylene terephthalate). The results from both the polymerization and degradation reactions are discussed in terms of ligand functionality. Nine new complexes based on thioether appended iminophenolate (ONS) ligands have been prepared and fully characterized in solution by NMR spectroscopy.![]()
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Affiliation(s)
- Jack Stewart
- Department of Chemistry, University of Bath, Claverton Down, Bath BA27AY, UK
| | - Martin Fuchs
- Lehrstuhl für Bioanorganische Chemie, Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Jack Payne
- Department of Chemistry, University of Bath, Claverton Down, Bath BA27AY, UK
| | - Oliver Driscoll
- Department of Chemistry, University of Bath, Claverton Down, Bath BA27AY, UK
| | | | - Benjamin D. Ward
- Department of Chemistry, Cardiff University, Park Place, Cardiff, CF10 3AT, UK
| | - Sonja Herres-Pawlis
- Lehrstuhl für Bioanorganische Chemie, Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Matthew D. Jones
- Department of Chemistry, University of Bath, Claverton Down, Bath BA27AY, UK
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6
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Macrocycles in dual role: ancillary ligands in metal complexes and organocatalysts for the ring-opening polymerization of lactide. J INCL PHENOM MACRO 2021. [DOI: 10.1007/s10847-021-01045-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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7
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Chen XM, Huang LC, Gao W. One-pot synthesis of cobalt complexes with 2,6-bis(arylimino)phenoxyl/phenthioxyl ligands and catalysis on isoprene polymerization. Dalton Trans 2021; 50:5218-5225. [PMID: 33881099 DOI: 10.1039/d1dt00371b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several cobalt complexes supported by 2,6-bis(arylimino)phenoxyl/phenthioxyl ligands κ2N,X-Ar[NXN]CoCl(THF) (1a, X = O, Ar = 2,6-Me2C6H3; 1b, X = O, Ar = 2,6-iPr2C6H3; 2a, X = S, Ar = 2,6-Me2C6H3; 2b, X = S, Ar = 2,6-iPr2C6H3) were synthesized by direct oxygen(sulfur) insertion into the C-Co bond of the mixed-valence cobalt complexes {κ2C,N,η6-Ar[NCN]Co-κN-CoCl(μ-Cl)}2. Crystallization of 1b in the presence of water gave the hydrolysis product 1b'. Treatment of Ar[NCN]Li with dioxygen followed by the addition of CoCl2 afforded the heteroatomic complexes {κ2N,O-Ar[NON]Co(μ-Cl)2Li}2 (3a, Ar = 2,6-Me2C6H3; 3b, Ar = 2,6-iPr2C6H3) or κ2N,O-Ar[NON]Co2Cl2(μ-Cl)2Li(THF)2 (4a, Ar = 2,6-Me2C6H3; 4b, Ar = 2,6-iPr2C6H3) depending on the amount of CoCl2 used. The Co(iii)/Li heterometallic complex 3b' with imino-phenoxyl-amino ligands was formed probably via a redox reaction of 3b. The reactions of Ar[NCN]Li with elemental sulfur and CoCl2 gave κ2N,S-Ar[NSN]Co2Cl2(μ-Cl)2Li(THF)2 (5a, Ar = 2,6-Me2C6H3; 5b, Ar = 2,6-iPr2C6H3) respectively. These complexes were well characterized by FT-IR and elemental analyses, and the molecular structures of 1b', 3b', 4a, and 4b were confirmed by X-ray crystallography. Upon activation with Al2Et3Cl3 in toluene, these complexes showed high activities in isoprene polymerization affording cis-1,4 enriched polymers with a moderate molecular weight (0.85-4.72 × 104 Da).
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Affiliation(s)
- Xue-Meng Chen
- College of Chemistry, Jilin University, Changchun 130012, China.
| | - Li-Cheng Huang
- College of Chemistry, Jilin University, Changchun 130012, China.
| | - Wei Gao
- College of Chemistry, Jilin University, Changchun 130012, China.
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8
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Kazarina OV, Morozov AG, Fedyushkin IL. Acenaphthylene-Bis(arylamide) Complexes of Aluminum and Gallium in the Polymerization of Lactide. POLYMER SCIENCE SERIES B 2021. [DOI: 10.1134/s1560090421020056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Jung HJ, Cho Y, Kim D, Mehrkhodavandi P. Cationic aluminum, gallium, and indium complexes in catalysis. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01741h] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The introduction of cationic charge allows cationic group 13 complexes to be excellent Lewis acid catalysts. Cationic aluminum, gallium, and indium complexes in catalysis are comprehensively reviewed based on the reaction type.
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Affiliation(s)
- Hyuk-Joon Jung
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Youngjung Cho
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
| | - Diana Kim
- Department of Chemistry
- University of British Columbia
- Vancouver
- Canada
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10
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Choe S, Lee H, Nayab S. Synthesis, structures, and catalytic efficiency in ring opening polymerization of rac-lactide with tridentate vs. bidentate cobalt( ii), zinc( ii), and cadmium( ii) complexes containing N-substituted N, N-bis((3,5-dimethyl-1 H-pyrazol-1-yl)methyl)amine ligands. RSC Adv 2021; 11:18840-18851. [PMID: 35478641 PMCID: PMC9033469 DOI: 10.1039/d1ra02365a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/20/2021] [Indexed: 01/09/2023] Open
Abstract
A series of Co(ii), Zn(ii), and Cd(ii) complexes supported by 1-(3,5-dimethyl-1H-pyrazol-1-yl)-N-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-N-(furan-2-ylmethyl)methanamine (LA) and N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-4-isopropylaniline (LB) were synthesized. The direct chelation of CoCl2·6H2O, ZnCl2, and CdBr2·4H2O by the ligands produced [LnMX2] (Ln = LA or LB; M = Zn or Co, with X = Cl; M = Cd, with X = Br) complexes in high yields. Structural studies revealed that [LBCoCl2] and [LBZnCl2] adopted distorted tetrahedral geometries, as LB coordinated the metal centers in a bidentate fashion, while LA coordinated the metal centers in a tridentate fashion through the nitrogen atoms of the pyrazole and amine moieties, so that [LACoCl2] and [LAZnCl2] exhibited trigonal bipyramidal geometries and [LACdBr2] a square pyramidal geometry. [LBCdBr2] has two Cd-containing structures per unit cell, whereby one Cd center adopted a distorted tetrahedral geometry and the other exhibited square bipyramidal geometry. The in situ-generated alkyl derivatives of the synthesized complexes were assessed in the ring-opening polymerization of rac-lactide. Heterotactic polylactides (PLAs) were furnished with all complexes. The [LBZnCl2]/MeLi system produced PLA with a superior heterotactic bias (Pr up to 0.94) at −25 °C. PLAs with wide-ranging polydispersity indices (1.16–2.23) and low molecular weights were produced in all cases, irrespective of the specific M(II) center and ancillary ligand utilized. Co(ii), Zn(ii), and Cd(ii) complexes supported by bis-pyrazolyl ligands were applied to the ring-opening polymerization of rac-lactide to produce heterotactic polylactides (PLAs) with superior heterotactic bias i.e. Pr up to 0.94 at −25 °C.![]()
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Affiliation(s)
- Solhye Choe
- Department of Chemistry and Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Hyosun Lee
- Department of Chemistry and Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Saira Nayab
- Department of Chemistry
- Shaheed Benazir Bhutto University
- Islamic Republic of Pakistan
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11
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Ghosh S, Glöckler E, Wölper C, Tjaberings A, Gröschel AH, Schulz S. Active Ga-catalysts for the ring opening homo- and copolymerization of cyclic esters, and copolymerization of epoxide and anhydrides. Dalton Trans 2020; 49:13475-13486. [PMID: 32966460 DOI: 10.1039/d0dt02831b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A series of gallium complexes L12Ga4Me8 (1), L22Ga4Me8 (2), and L32Ga4Me8 (3) was synthesized by reaction of GaMe3 with Schiff base ligands L1-3H2 (L1H2 = 2,4-di-tert-butyl-6-{[(3-hydroxypropyl)imino]methyl}phenol; L2H2 = 2,4-dichloro-6-{[(3-hydroxypropyl)imino]methyl}phenol; L3H2 = 4-tert-butyl-2-{[(3-hydroxypropyl)imino]methyl}phenol) and characterized by 1H, 13C NMR, IR spectroscopy, elemental analysis and single crystal X-ray analysis (1, 2), proving their tetranuclear structure in the solid state. Complexes 1-3 showed good catalytic activity in the ring opening homopolymerization (ROP) and ring opening copolymerization (ROcoP) of lactide (LA) and ε-caprolactone (ε-CL) in the presence of benzyl alcohol (BnOH) in toluene at 100 °C, yielding polymers with the expected average molecular weights (Mn) and narrow molecular weight distributions (MWD), as well as a high isoselectivity for the ROP of rac-lactide (rac-LA), yielding isotactic-enriched PLAs with Pm values up to 0.78. Kinetic studies with complex 1 proved the first order dependence on monomer concentration, while mechanistic studies confirmed the coordination insertion mechanistic (CIM) pathway. Sequential addition of monomers gave well defined diblock copolymers of PCL-b-PLLA and PLLA-b-PCL, proving the living character of the polymerization reactions. The catalysts also showed perfect selectivity for the copolymerization of cyclohexene oxide (CHO) with both succinic anhydride (SA) and maleic anhydride (MA) in the presence of BnOH and produced >99% alternating block copolymers.
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Affiliation(s)
- Swarup Ghosh
- Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, S07 S03 C30, D-45141 Essen, Germany.
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12
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Anwar H, Haque RA, Saleem RSZ, Iqbal MA. Recent advances in synthesis of organometallic complexes of indium. REV INORG CHEM 2020. [DOI: 10.1515/revic-2020-0005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
AbstractThe indium complexes are being used in many applications like catalysis, optoelectronics, sensors, solar cells, biochemistry, medicine, infrared (IR) mirrors and thin-film transistors (TFTs). In organometallic complexes of indium, it forms different types of complexes with single, double, triple and tetra linkages by coordinating with numerous elements like C, N, O and S and also with some other elements like Se and Ru. So, the present study comprises all the possible ways to synthesize the indium complexes by reacting with different organic ligands; most of them are N-heterocyclic carbenes, amines, amides and phenols. The commonly used solvents for these syntheses are tetrahydrofuran, dichloromethane, toluene, benzene, dimethyl sulfoxide (DMSO) and water. According to the nature of the ligands, indium complexes were reported at different temperatures and stirring time. Because of their unique characteristics, the organometallic chemistry of group 13 metal indium complexes remains a subject of continuing interest in synthetic chemistry as well as material science.
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Affiliation(s)
- Hira Anwar
- Department of Chemistry, University of Agriculture, Faisalabad-38040, Pakistan
- Organometallic and Coordination Chemistry Laboratory, University of Agriculture, Faisalabad-38040, Pakistan
| | - Rosenani A. Haque
- School of Chemical Sciences, Universiti Sains Malaysia, 11800-USM, Penang, Malaysia
| | - Rahman Shah Zaib Saleem
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences, Lahore 54792, Pakistan
| | - Muhammad Adnan Iqbal
- Department of Chemistry, University of Agriculture, Faisalabad-38040, Pakistan
- Organometallic and Coordination Chemistry Laboratory, University of Agriculture, Faisalabad-38040, Pakistan,
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13
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Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters. Catalysts 2020. [DOI: 10.3390/catal10070800] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
This review describes the recent advances (from 2008 onwards) in the use of Schiff-base metal complexes as catalysts for the ring opening polymerization (ROP) of cyclic esters. The synthesis and structure of the metal complexes, as well as all aspects concerning the polymerization process and the characteristics of the polymers formed, will be discussed.
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14
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Ghosh S, Glöckler E, Wölper C, Tjaberings A, Gröschel AH, Schulz S. Heteroleptic β-Ketoiminate Magnesium Catalysts for the Ring-Opening Polymerization of Lactide. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00168] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Swarup Ghosh
- Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstraße 7, S07 S03 C30, 45141 Essen, Germany
| | - Eduard Glöckler
- Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstraße 7, S07 S03 C30, 45141 Essen, Germany
| | - Christoph Wölper
- Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstraße 7, S07 S03 C30, 45141 Essen, Germany
| | - Alexander Tjaberings
- Faculty of Chemistry, University of Münster and Center for Soft Nanoscience (SoN), Busso-Peus-Strasse 10, 48149 Münster, Germany
| | - André H. Gröschel
- Faculty of Chemistry, University of Münster and Center for Soft Nanoscience (SoN), Busso-Peus-Strasse 10, 48149 Münster, Germany
| | - Stephan Schulz
- Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstraße 7, S07 S03 C30, 45141 Essen, Germany
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15
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Kayan A. Recent Studies on Single Site Metal Alkoxide Complexes as Catalysts for Ring Opening Polymerization of Cyclic Compounds. CATALYSIS SURVEYS FROM ASIA 2020. [DOI: 10.1007/s10563-019-09291-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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16
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Stewart JA, McKeown P, Driscoll OJ, Mahon MF, Ward BD, Jones MD. Tuning the Thiolen: Al(III) and Fe(III) Thiolen Complexes for the Isoselective ROP of rac-Lactide. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01205] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Jack A. Stewart
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Paul McKeown
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Oliver J. Driscoll
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Mary F. Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Benjamin D. Ward
- Department of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, U.K
| | - Matthew D. Jones
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
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17
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Ghosh S, Schäfer PM, Dittrich D, Scheiper C, Steiniger P, Fink G, Ksiazkiewicz AN, Tjaberings A, Wölper C, Gröschel AH, Pich A, Herres‐Pawlis S, Schulz S. Heterolepic β-Ketoiminate Zinc Phenoxide Complexes as Efficient Catalysts for the Ring Opening Polymerization of Lactide. ChemistryOpen 2019; 8:951-960. [PMID: 31338277 PMCID: PMC6625107 DOI: 10.1002/open.201900203] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Indexed: 11/25/2022] Open
Abstract
Zinc phenoxide complexes L1ZnOAr 1-4 (L1=Me2NC2H4NC(Me)CHC(Me)O) and L2ZnOAr 5-8 (L2=Me2NC3H6NC(Me)CHC(Me)O) with donor-functionalized β-ketoiminate ligands (L1/2) and OAr substituents (Ar=Ph 1, 5; 2,6-Me2-C6H3 2, 6; 3,5-Me2-C6H3 3, 7; 4-Bu-C6H4 4, 8) with tuneable electronic and steric properties were synthesized and characterized. 1-8 adopt binuclear structures in the solid state except for 5, while they are monomeric in CDCl3 solution. 1-8 are active catalysts for the ring opening polymerization (ROP) of lactide (LA) in CH2Cl2 at ambient temperature and the catalytic activity is controlled by the electronic and steric properties of the OAr substituent, yielding polymers with high average molecular weight (M n) and moderately controlled molecular weight distribution (MWDs). 1 and 5 showed a living polymerization character and kinetic studies on the ROP of L-LA with 1 and 5 proved first order dependencies on the monomer concentration. Homonuclear decoupled 1H-NMR analyses of polylactic acid (PLA) formed with rac-LA proved isotactic enrichment of the PLA microstructure.
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Affiliation(s)
- Swarup Ghosh
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Pascal M. Schäfer
- Institute of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Dennis Dittrich
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Christoph Scheiper
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Phillip Steiniger
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Gerhard Fink
- Institute of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Agnieszka N. Ksiazkiewicz
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 252074AachenGermany
- DWI – Leibniz Institute for Interactive Materials e. V.Forckenbeckstraße 5042074AachenGermany
| | - Alexander Tjaberings
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) NanoEnergieTechnikZentrumCarl-Benz-Str. 19947057Duisburg
| | - Christoph Wölper
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - André H. Gröschel
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) NanoEnergieTechnikZentrumCarl-Benz-Str. 19947057Duisburg
| | - Andrij Pich
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 252074AachenGermany
- DWI – Leibniz Institute for Interactive Materials e. V.Forckenbeckstraße 5042074AachenGermany
- Aachen Maastricht Institute for Biobased Materials (AMIBM)Maastricht University, Brightlands Chemelot CampusUrmonderbaan 226167RD GeleenThe Netherlands
| | - Sonja Herres‐Pawlis
- Institute of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Stephan Schulz
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
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18
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Ghosh S, Nguyen TN, Thi TT, Mejía E. Re-evaluation of the ring-opening polymerization of ε-caprolactone catalyzed by dialkylmagnesium reagents. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.12.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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19
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Gao J, Zhu D, Zhang W, Solan GA, Ma Y, Sun WH. Recent progress in the application of group 1, 2 & 13 metal complexes as catalysts for the ring opening polymerization of cyclic esters. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00855a] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review focuses on recent developments concerned with the use of well-defined main group complexes as (pre-)catalysts for the ROP of cyclic esters to give aliphatic polyesters; factors influencing catalytic activity, selectivity and polymer properties are all discussed.
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Affiliation(s)
- Jiahao Gao
- 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
| | - Dongzhi Zhu
- 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
| | - Wenjuan Zhang
- 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
| | - Gregory A. Solan
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Yanping Ma
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Wen-Hua Sun
- Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
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20
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Driscoll OJ, Leung CKC, Mahon MF, McKeown P, Jones MD. Iron(III) Salalen Complexes for the Polymerisation of Lactide. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801239] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Oliver J. Driscoll
- Department of Chemistry Claverton Down University of Bath BA2 7AY Bath UK
| | | | - Mary F. Mahon
- Department of Chemistry Claverton Down University of Bath BA2 7AY Bath UK
| | - Paul McKeown
- Department of Chemistry Claverton Down University of Bath BA2 7AY Bath UK
| | - Matthew D. Jones
- Department of Chemistry Claverton Down University of Bath BA2 7AY Bath UK
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21
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Hu M, Zhang W, Ma W, Han F, Song W. Preparation of titanium complexes containing unsymmetric N2O2-ligands and their catalytic properties for polymerization of rac-lactide. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.08.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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22
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Jung HJ, Chang C, Yu I, Aluthge DC, Ebrahimi T, Mehrkhodavandi P. Coupling of Epoxides and Lactones by Cationic Indium Catalysts To Form Functionalized Spiro-Orthoesters. ChemCatChem 2018. [DOI: 10.1002/cctc.201800474] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Hyuk-Joon Jung
- Department of Chemistry; University of British Columbia; 2036 Main Mall Vancouver BC V6T 1Z1 Canada
| | - Chen Chang
- Department of Chemistry; University of British Columbia; 2036 Main Mall Vancouver BC V6T 1Z1 Canada
| | - Insun Yu
- Department of Chemistry; University of British Columbia; 2036 Main Mall Vancouver BC V6T 1Z1 Canada
| | - Dinesh C. Aluthge
- Department of Chemistry; University of British Columbia; 2036 Main Mall Vancouver BC V6T 1Z1 Canada
| | - Tannaz Ebrahimi
- Department of Chemistry; University of British Columbia; 2036 Main Mall Vancouver BC V6T 1Z1 Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry; University of British Columbia; 2036 Main Mall Vancouver BC V6T 1Z1 Canada
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23
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Osten KM, Mehrkhodavandi P. Indium Catalysts for Ring Opening Polymerization: Exploring the Importance of Catalyst Aggregation. Acc Chem Res 2017; 50:2861-2869. [PMID: 29087695 DOI: 10.1021/acs.accounts.7b00447] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Inexorably, the environmental persistence and damage caused by polyolefins have become major drawbacks to their continued long-term use. Global shifts in thinking from fossil-fuel to renewable biobased resources have urged researchers to focus their attention on substituting fossil-fuel based polymers with renewable and biodegradable alternatives on an industrial scale. The recent development of biodegradable polyesters from ring opening polymerization (ROP) of bioderived cyclic ester monomers has emerged as a promising new avenue toward this goal. Ever increasing numbers of metal-based initiators have been reported in the literature for the controlled ROP of cyclic esters, in particular for the polymerization of lactide to produce poly(lactic acid) (PLA). PLA has several material weaknesses, which hinder its use as a replacement for commodity plastics. Despite many advances in developing highly active and controlled catalysts for lactide polymerization, no single catalyst system has emerged to replace industrially used catalysts and provide access to PLA materials with improved properties. We reported the first example of indium(III) for the ring opening polymerization of lactide. Since then, indium(III) has emerged as a useful Lewis acid in initiators for the controlled polymerization of lactide and other cyclic esters. In particular, we have developed a large family of chiral dinuclear indium complexes bearing tridentate diaminophenolate ligands and tetradentate salen and salan ligands. Complexes within our tridentate ligand family are highly active initiators for the moderately isoselective living and immortal polymerization of rac-lactide, as well as other cyclic esters. We have shown that subtle steric effects influence aggregation in these systems, with polymerization typically proceeding through a dinuclear propagating species. In addition, profound effects on polymerization activities have been observed for central tertiary versus secondary amine donors in these and other related systems. In contrast, our well-controlled and highly active chiral indium salen systems are more isoselective than the tridentate analogues and polymerize lactide via a mononuclear propagating species. Again, we have noticed that subtle steric and electronic changes to the ligand can influence both polymerization activity and stereoselectivity via aggregation phenomena. Recently, we have reported a promising new chiral indium catalyst supported by a tetradentate salan ligand. This catalyst is remarkably water and air stable and can be activated by linear and branched alcohols to provide controlled access to multiblock copolymers in air. This catalyst represents an important step forward toward generating new, commercially relevant catalysts for ROP of cyclic esters to produce novel biodegradable polymers, and highlights the unique value of indium-based catalysts in the field.
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Affiliation(s)
- Kimberly M. Osten
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
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24
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Ghosh S, Spannenberg A, Mejía E. Cubane-Type Polynuclear Zinc Complexes Containing Tridentate Schiff
Base Ligands: Synthesis, Characterization, and Ring-Opening Polymerization Studies of rac
-Lactide and ε
-Caprolactone. Helv Chim Acta 2017. [DOI: 10.1002/hlca.201700176] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Swarup Ghosh
- Leibniz Institute for Catalysis; University of Rostock; Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Anke Spannenberg
- Leibniz Institute for Catalysis; University of Rostock; Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Esteban Mejía
- Leibniz Institute for Catalysis; University of Rostock; Albert-Einstein-Str. 29a 18059 Rostock Germany
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25
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Bakthavachalam K, Yuvaraj K, Raghavendra B, Dorcet V, Roisnel T, Rit A, Ghosh S. Synthesis, Structure and Chemistry of Mono- and Digallane Complexes Supported by N,O
-Ketimine Ligand. ChemistrySelect 2017. [DOI: 10.1002/slct.201701634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Kuppusamy Yuvaraj
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Beesam Raghavendra
- Department of Chemistry; Pondicherry University; Puducherry 600014 India
| | - Vincent Dorcet
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; France
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; France
| | - Arnab Rit
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Sundargopal Ghosh
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
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26
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Ebrahimi T, Aluthge DC, Patrick BO, Hatzikiriakos SG, Mehrkhodavandi P. Air- and Moisture-Stable Indium Salan Catalysts for Living Multiblock PLA Formation in Air. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01939] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tannaz Ebrahimi
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
- Department
of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC Canada, V6T1Z3
| | - Dinesh C. Aluthge
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
| | - Brian O. Patrick
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
| | - Savvas G. Hatzikiriakos
- Department
of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC Canada, V6T1Z3
| | - Parisa Mehrkhodavandi
- Department
of Chemistry, University of British Columbia, Vancouver, BC Canada, V6T1Z1
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27
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Group 4 Metal Complexes of Phenylene-Salalen Ligands in rac
-Lactide Polymerization Giving High Molecular Weight Stereoblock Poly(lactic acid). Chemistry 2017; 23:11540-11548. [DOI: 10.1002/chem.201701007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Indexed: 01/19/2023]
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28
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Kremer AB, Andrews RJ, Milner MJ, Zhang XR, Ebrahimi T, Patrick BO, Diaconescu PL, Mehrkhodavandi P. A Comparison of Gallium and Indium Alkoxide Complexes as Catalysts for Ring-Opening Polymerization of Lactide. Inorg Chem 2017; 56:1375-1385. [PMID: 28103034 DOI: 10.1021/acs.inorgchem.6b02433] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The impact of the metal size and Lewis acidity on the polymerization activity of group 13 metal complexes was studied, and it was shown that, within the same ligand family, indium complexes are far more reactive and selective than their gallium analogues. To this end, gallium and aluminum complexes supported by a tridentate diaminophenolate ligand, as well as gallium complexes supported by N,N'-ethylenebis(salicylimine)(salen) ligands, were synthesized and compared to their indium analogues. Using the tridentate ligand set, it was possible to isolate the gallium chloride complexes 3 and (±)-4 and the aluminum analogues 5 and (±)-6. The alkoxygallium complex (±)-2, supported by a salen ligand, was also prepared and characterized and, along with the three-component system GaCl3/BnOH/NEt3, was tested for the ring-opening polymerization of lactide and ε-caprolactone. The polymerization rates and selectivities of both systems were significantly lower than those for the indium analogues. The reaction of (±)-2 with 1 equiv of lactide forms the first insertion product, which is stable in solution and can be characterized at room temperature. In order to understand the differences of the reactivity within the group 13 metal complexes, a Lewis acidity study using triethylphosphine oxide (the Gutmann-Beckett method) was undertaken for a series of aluminum, gallium, and indium halide complexes; this study shows that indium halide complexes are less Lewis acidic than their aluminum and gallium analogues. Density functional theory calculations show that the Mulliken charges for the indium complexes are higher than those for the gallium analogues. These data suggest that the impact of ligands on the reactivity is more significant than that of the metal Lewis acidity.
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Affiliation(s)
- Alexandre B Kremer
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada
| | - Ryan J Andrews
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada
| | - Matthew J Milner
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada
| | - Xu R Zhang
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada
| | - Tannaz Ebrahimi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada
| | - Brian O Patrick
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada
| | - Paula L Diaconescu
- Department of Chemistry & Biochemistry, University of California , Los Angeles, California 90095, United States
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada
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29
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Specklin D, Fliedel C, Hild F, Mameri S, Karmazin L, Bailly C, Dagorne S. Mononuclear salen-gallium complexes for iso-selective ring-opening polymerization (ROP) of rac-lactide. Dalton Trans 2017; 46:12824-12834. [DOI: 10.1039/c7dt02730c] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mononuclear salen-supported Ga amido and alkoxide complexes, structurally characterized herein, mediate the controlled and iso-selective polymerization ofrac-lactide.
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Affiliation(s)
- David Specklin
- Institut de Chimie de Strasbourg
- CNRS-Université de Strasbourg
- UMR 7177
- F-67000 Strasbourg
- France
| | - Christophe Fliedel
- Institut de Chimie de Strasbourg
- CNRS-Université de Strasbourg
- UMR 7177
- F-67000 Strasbourg
- France
| | - Frédéric Hild
- Institut de Chimie de Strasbourg
- CNRS-Université de Strasbourg
- UMR 7177
- F-67000 Strasbourg
- France
| | - Samir Mameri
- Institut de Chimie de Strasbourg
- CNRS-Université de Strasbourg
- UMR 7177
- F-67000 Strasbourg
- France
| | - Lydia Karmazin
- Service de Radiocristallographie
- CNRS-Université de Strasbourg
- UMR 7177
- F-67000 Strasbourg
- France
| | - Corinne Bailly
- Service de Radiocristallographie
- CNRS-Université de Strasbourg
- UMR 7177
- F-67000 Strasbourg
- France
| | - Samuel Dagorne
- Institut de Chimie de Strasbourg
- CNRS-Université de Strasbourg
- UMR 7177
- F-67000 Strasbourg
- France
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30
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Beament J, Mahon MF, Buchard A, Jones MD. Salan group 13 complexes – structural study and lactide polymerisation. NEW J CHEM 2017. [DOI: 10.1039/c6nj03844a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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31
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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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32
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Hu M, Han F, Zhang W, Ma W, Deng Q, Song W, Yan H, Dong G. Preparation of zirconium and hafnium complexes containing chiral N atoms from asymmetric tertiary amine ligands, and their catalytic properties for polymerization of rac-lactide. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02618d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Preparation of Zr and Hf complexes containing chiral N atoms, and their use in polymerization of rac-lactide.
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Affiliation(s)
- Minggang Hu
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Fuzhong Han
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Wenzhi Zhang
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Wenhui Ma
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Qigang Deng
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Weiming Song
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Hailong Yan
- Qiqihar Environmental Protection Bureau Monitoring Center
- Qiqihar 161005
- China
| | - Guohua Dong
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
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33
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McKeown P, Brown-Humes J, Davidson MG, Mahon MF, Woodman TJ, Jones MD. Ligands and complexes based on piperidine and their exploitation of the ring opening polymerisation of rac-lactide. Dalton Trans 2017; 46:5048-5057. [DOI: 10.1039/c7dt00751e] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ligands based on 2-aminomethyl piperidine have been prepared, complexed to a variety of metals and tested for their ability to polymerise lactide.
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Affiliation(s)
- Paul McKeown
- Doctoral Training Centre in Sustainable Chemical Technologies
- University of Bath
- Bath BA2 7AY
- UK
| | | | - Matthew G. Davidson
- Doctoral Training Centre in Sustainable Chemical Technologies
- University of Bath
- Bath BA2 7AY
- UK
- Department of Chemistry
| | - Mary F. Mahon
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
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34
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Kirk SM, Kociok-Köhn G, Jones MD. Zirconium vs Aluminum Salalen Initiators for the Production of Biopolymers. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00718] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sarah M. Kirk
- Doctoral Training
Centre in Sustainable Chemical Technologies and ‡Department of
Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - Gabriele Kociok-Köhn
- Doctoral Training
Centre in Sustainable Chemical Technologies and ‡Department of
Chemistry, University of Bath, Bath BA2 7AY, U.K
| | - Matthew D. Jones
- Doctoral Training
Centre in Sustainable Chemical Technologies and ‡Department of
Chemistry, University of Bath, Bath BA2 7AY, U.K
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35
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Mandal M, Oppelt K, List M, Teasdale I, Chakraborty D, Monkowius U. Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide. MONATSHEFTE FUR CHEMIE 2016; 147:1883-1892. [PMID: 27795584 PMCID: PMC5063905 DOI: 10.1007/s00706-016-1830-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/26/2016] [Indexed: 11/28/2022]
Abstract
ABSTRACT Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV-Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phenolate oxygen and imine nitrogen atoms of two ligands in a distorted square-planar geometry. The existence of ligand-centered, as well as Cu(II)-centered quasi-reversible and reversible redox reactions are observed in the cyclic voltammetry experiments of all the complexes. All complexes are able to catalyze the ring-opening polymerization of rac-lactide yielding polymers with moderate molecular weights and moderately broad molecular weight distributions. GRAPHICAL ABSTRACT
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Affiliation(s)
- Mrinmay Mandal
- Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
- Department of Chemistry, Indian Institute of Technology Patna, Patna, Bihar 800 013 India
| | - Kerstin Oppelt
- Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
| | - Manuela List
- Institute for Chemical Technology of Organic Materials, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
| | - Ian Teasdale
- Institute of Polymer Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
| | - Debashis Chakraborty
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600 036 India
| | - Uwe Monkowius
- Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
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36
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Rajashekhar B, Roymuhury SK, Chakraborty D, Ramkumar V. Group 4 metal complexes of Trost's semi-crown ligand: synthesis, structural characterization and studies on the ring-opening polymerization of lactides and ε-caprolactone. Dalton Trans 2016; 44:16280-93. [PMID: 26262508 DOI: 10.1039/c5dt02267c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of titanium(IV), zirconium(IV) and hafnium(IV) complexes of Trost's semi-crown ligand is described. All complexes were fully characterized by 1H and 13C NMR and mass spectroscopy. The molecular structures of the representative complexes 2, 3 and 4 were determined by single-crystal X-ray diffraction studies. The X-ray diffraction studies reveal that complexes 2, 3 and 4 crystallized in an orthorhombic crystal system. Complexes 2 and 3 have a monomeric structure in the solid state with distorted octahedral geometry around the metal center, whereas complex 4 was found to crystallize in a trimeric structure bridging with an oxygen atom, where the geometry around the titanium is distorted trigonal bipyramidal. The activities and stereoselectivities of these complexes toward the ring-opening polymerization (ROP) of lactides (L-LA and rac-LA) and ε-caprolactone (CL) have been investigated. Complexes 1–4 were found to be efficient single-component initiators for the ring-opening polymerization of cyclic esters and yielded high molecular weight polymers (Mn) with narrow molecular weight distributions (MWD).The microstructure of the resultant polylactides (PLAs) from rac-LA was determined. Complexes 2 and 3 afforded isotactic-enriched PLA (Pm = 0.78–0.71) with narrow MWD (1.07–1.04), on the other hand complexes 1 and 4 produced atactic PLA. Kinetic and post polymerization studies confirm that the polymerization proceeds through the coordination–insertion mechanism.
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Affiliation(s)
- Bijja Rajashekhar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600 036, Tamil Nadu, India.
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37
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Kremer AB, Osten KM, Yu I, Ebrahimi T, Aluthge DC, Mehrkhodavandi P. Dinucleating Ligand Platforms Supporting Indium and Zinc Catalysts for Cyclic Ester Polymerization. Inorg Chem 2016; 55:5365-74. [PMID: 27187767 DOI: 10.1021/acs.inorgchem.6b00358] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The synthesis of the first alkoxide-bridged indium complex supported by a chiral dinucleating ligand platform (1), along with its zinc analogue (2), is reported. Both complexes are synthesized in a one-pot reaction starting from a chiral dinucleating bis(diamino)phenolate ligand platform, sodium ethoxide, and respective metal salts. The dinucleating indium analogue (7) based on an achiral ligand backbone is also reported. Indium complexes bearing either the chiral or achiral ligand catalyze the ring-opening polymerization of racemic lactide (rac-LA) to afford highly heterotactic poly(lactic acid) (PLA; Pr > 0.85). The indium complex bearing an achiral ligand affords essentially atactic PLA from meso-LA. The role of the dinucleating ligand structure in catalyst synthesis and polymerization activity is discussed.
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Affiliation(s)
- Alexandre B Kremer
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Kimberly M Osten
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Insun Yu
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Tannaz Ebrahimi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Dinesh C Aluthge
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
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Kirk SM, Quilter HC, Buchard A, Thomas LH, Kociok-Kohn G, Jones MD. Monomeric and dimeric Al(iii) complexes for the production of polylactide. Dalton Trans 2016; 45:13846-52. [DOI: 10.1039/c6dt02861f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Group 4 complexes bearing bis(salphen) ligands: Synthesis, characterization, and polymerization studies. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/pola.27918] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Aluthge DC, Ahn JM, Mehrkhodavandi P. Overcoming aggregation in indium salen catalysts for isoselective lactide polymerization. Chem Sci 2015; 6:5284-5292. [PMID: 29449930 PMCID: PMC5669251 DOI: 10.1039/c5sc01584g] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 06/20/2015] [Indexed: 11/30/2022] Open
Abstract
A methodology for controlling aggregation in highly active and isoselective indium catalysts for the ring opening polymerization of racemic lactide is reported. A series of racemic and enantiopure dinuclear indium ethoxide complexes bearing salen ligands [(ONNOR)InOEt]2 (R = Br, Me, admantyl, cumyl, t-Bu) were synthesized and fully characterized. Mononuclear analogues (ONNOR)InOCH2Pyr (R = Br, t-Bu, SiPh3) were synthesized by controlling aggregation with the use of chelating 2-pyridinemethoxide functionality. The nuclearity of metal complexes was confirmed using PGSE NMR spectroscopy. Detailed kinetic studies show a clear initiation period for these dinuclear catalysts, which is lacking in their mononuclear analogues. The polymerization behavior of analogous dinuclear and mononuclear compounds is identical and consistent with a mononuclear propagating species. The isotacticity of the resulting polymers was investigated using direct integration and peak deconvolution methodologies and the two were compared.
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Affiliation(s)
- D C Aluthge
- Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , BC V6T 1Z1 , Canada .
| | - J M Ahn
- Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , BC V6T 1Z1 , Canada .
| | - P Mehrkhodavandi
- Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , BC V6T 1Z1 , Canada .
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