1
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Kricheldorf HR, Weidner SM. Low molar mass cyclic poly(L-lactide)s: separate transesterification reactions of cycles and linear chains in the solid state. SOFT MATTER 2024; 20:6131-6139. [PMID: 39041173 DOI: 10.1039/d4sm00567h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
L-Lactide (LA) was polymerized with neat tin(II) 2-ethylhexanoate (SnOct2) in toluene at 115 °C at low concentration with variation of the LA/Cat ratio. Cyclic polylactides (cPLAs) with number average molecular weights (Mn) between 7000 and 17 000 were obtained. MALDI-TOF mass spectrometry also revealed the formation of a few percent of linear chains. Crystalline cPLAs with Mn around 9000 and 14 000 were annealed at 140 °C in the presence of ScOct2 or dibutyl-2-stanna-1,3-dithiolane (DSTL). Simultaneously, crystallites of extended linear chains and crystallites of extended cycles were formed regardless of the catalyst, indicating that transesterification reaction proceeded different for linear chains and for cycles, governed by thermodynamic control. The formation of extended chain crystallites with low dispersity indicates the existence of symproportionation of short and long chains. A complementary experiment was carried out with a PLA ethyl ester composed mainly of linear chains with a small fraction of cycles.
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Affiliation(s)
- Hans R Kricheldorf
- Universität Hamburg, Institut für Technische Chemie und Makromolekulare Chemie, Bundesstr. 45, D-20146 Hamburg, Germany.
| | - Steffen M Weidner
- BAM, Bundesanstalt für Materialforschung und -prüfung, Richard Willstätter Str. 11, D-12489, Berlin, Germany
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2
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Akhtar R, Gaurav K, Khan S. Applications of low-valent compounds with heavy group-14 elements. Chem Soc Rev 2024; 53:6150-6243. [PMID: 38757535 DOI: 10.1039/d4cs00101j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Over the last two decades, the low-valent compounds of group-14 elements have received significant attention in several fields of chemistry owing to their unique electronic properties. The low-valent group-14 species include tetrylenes, tetryliumylidene, tetrylones, dimetallenes and dimetallynes. These low-valent group-14 species have shown applications in various areas such as organic transformations (hydroboration, cyanosilylation, N-functionalisation of amines, and hydroamination), small molecule activation (e.g. P4, As4, CO2, CO, H2, alkene, and alkyne) and materials. This review presents an in-depth discussion on low-valent group-14 species-catalyzed reactions, including polymerization of rac-lactide, L-lactide, DL-lactide, and caprolactone, followed by their photophysical properties (phosphorescence and fluorescence), thin film deposition (atomic layer deposition and vapor phase deposition), and medicinal applications. This review concisely summarizes current developments of low-valent heavier group-14 compounds, covering synthetic methodologies, structural aspects, and their applications in various fields of chemistry. Finally, their opportunities and challenges are examined and emphasized.
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Affiliation(s)
- Ruksana Akhtar
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr Homi Bhabha Road, Pashan, Pune-411008, India.
| | - Kumar Gaurav
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr Homi Bhabha Road, Pashan, Pune-411008, India.
| | - Shabana Khan
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr Homi Bhabha Road, Pashan, Pune-411008, India.
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3
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Laiwattanapaisarn N, Virachotikul A, Chumsaeng P, Jaenjai T, Phomphrai K. Ring-Opening Co- and Terpolymerization of Epoxides, Cyclic Anhydrides, and l-Lactide Using Constrained Aluminum Inden Complexes. Inorg Chem 2022; 61:20616-20628. [DOI: 10.1021/acs.inorgchem.2c03532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Affiliation(s)
- Nattiya Laiwattanapaisarn
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Arnut Virachotikul
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Phongnarin Chumsaeng
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Tiphanan Jaenjai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong21210, Thailand
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4
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Ochs J, Pagnacco CA, Barroso-Bujans F. Macrocyclic polymers: Synthesis, purification, properties and applications. Prog Polym Sci 2022. [DOI: 10.1016/j.progpolymsci.2022.101606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Abstract
ConspectusThis Account discusses the evolution of our strategy to conduct environmentally responsible research in the field of polymer chemistry. To contextualize our work, we begin with a broad historical overview of the modern environmental movement, the rise of sustainability as a concept, and how chemistry has responded to these forces, which were often sharply critical of our field. We then trace our own responses, from graduate school onward, chronicling a series of experiences and research projects that molded, challenged, and reshaped how we think about sustainability in polymer science.Since beginning our independent careers in 2004, we have recognized and worked to resolve the tension between designing synthetic polymers for specific desired thermomechanical properties and minimizing environmental impact. In our early years, we were most strongly guided by the 12 Principles of Green Chemistry (12PGC), which had only recently been proposed. The authors' early research agendas had a rather narrow focus on two areas, specifically catalysis and biobased monomers, which we saw as strongly linked to sustainability. Over time, we found these areas to be too narrow in their focus, ignoring important considerations such as the capacity of monomer supply to support scale-up and the impact polymers have at the end of their usage lifetimes. With respect to monomers and catalysts, we consider descriptive metrics that quantify waste production and the toxicity of compounds used during synthesis. In terms of polymer end-of-life, we discuss hydrophobicity as a tool to help understand susceptibility to degradation in the environment as well as some of the concerns with design for degradation, a critical component of 12PGC.Now, after nearly two decades of investigation, we believe that achieving sustainability in polymer science will require us to move beyond the qualitative use of the 12PGC to a portfolio of metrics. We note a heartening increase in the availability and use of such metrics and tools across the field. These include items that provide limited insight but are relatively trivial to integrate into existing workflows such as E factor or the Toxicity Estimation Software Tool. We also appreciate the increased use of Life Cycle Assessment (LCA), which is both dramatically more thorough and difficult to deploy. Finally, we propose the creation of a national LCA center, similar to instrumental core facilities. Such a resource would enable the use of this tool across multiple phases of research and we hope would more effectively guide us to a sustainable future.
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Affiliation(s)
| | - Robert T Mathers
- Department of Chemistry, Pennsylvania State University, New Kensington, Pennsylvania 15068, United States
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6
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Thumrongpatanaraks W, Pongpanit T, Chumsaeng P, Jaenjai T, Yimthachote S, Phomphrai K. Ring‐Opening Copolymerization of Cyclic Anhydrides and Epoxides by
bis
(amidinate)tin(II) Complex via Binary Catalyst System. ChemistrySelect 2022. [DOI: 10.1002/slct.202104450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wipavee Thumrongpatanaraks
- Department of Chemistry and Center of Excellence for Innovation in Chemistry Faculty of Science Mahidol University Rama 6 Road Bangkok 10400 Thailand
| | - Tanyawan Pongpanit
- Department of Materials Science and Engineering School of Molecular Science and Engineering Vidyasirimedhi Institute of Science and Technology (VISTEC) 555 Moo 1 Payupnai, Wangchan Rayong 21210 Thailand
| | - Phongnarin Chumsaeng
- Department of Materials Science and Engineering School of Molecular Science and Engineering Vidyasirimedhi Institute of Science and Technology (VISTEC) 555 Moo 1 Payupnai, Wangchan Rayong 21210 Thailand
| | - Tiphanan Jaenjai
- Department of Materials Science and Engineering School of Molecular Science and Engineering Vidyasirimedhi Institute of Science and Technology (VISTEC) 555 Moo 1 Payupnai, Wangchan Rayong 21210 Thailand
| | - Supajittra Yimthachote
- Department of Materials Science and Engineering School of Molecular Science and Engineering Vidyasirimedhi Institute of Science and Technology (VISTEC) 555 Moo 1 Payupnai, Wangchan Rayong 21210 Thailand
| | - Khamphee Phomphrai
- Department of Chemistry and Center of Excellence for Innovation in Chemistry Faculty of Science Mahidol University Rama 6 Road Bangkok 10400 Thailand
- Department of Materials Science and Engineering School of Molecular Science and Engineering Vidyasirimedhi Institute of Science and Technology (VISTEC) 555 Moo 1 Payupnai, Wangchan Rayong 21210 Thailand
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7
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Abstract
Reaction mechanisms and synthetic methods used for the preparation of homo- and copolylactides based on tin(ii) and tin(iv) catalysts are reviewed.
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Affiliation(s)
- Hans R. Kricheldorf
- Universität Hamburg, Institut für Technische und Makromolekulare Chemie, Bundesstr. 45, D-20146 Hamburg, Germany
| | - Steffen M. Weidner
- Bundesanstalt für Materialforschung und -prüfung – BAM, Richard Willstätter Str. 11, D-12489 Berlin, Germany
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8
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Yimthachote S, Chumsaeng P, Phomphrai K. Complexity of imine and amine Schiff-base tin(II) complexes: drastic differences of amino and pyridyl side arms. Dalton Trans 2021; 51:509-517. [PMID: 34847211 DOI: 10.1039/d1dt02997e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A series of homoleptic and heteroleptic imine and amine Schiff-base tin(II) complexes containing dimethylamino and pyridyl side arms were synthesized and structurally characterized. While the tin complexes containing the dimethylamino side arm could be prepared in good yield, unusual cyclodimerization and ligand dimerization were observed for the first time for Schiff-base tin complexes having a pyridyl side arm due to the added stabilization offered by the pyridyl ring. The amine Schiff-base tin(II) complexes were active for the ring-opening copolymerization of succinic anhydride (SA) and cyclohexene oxide (CHO) at 110 °C giving highly alternating poly(SA-alt-CHO).
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Affiliation(s)
- Supajittra Yimthachote
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand.
| | - Phongnarin Chumsaeng
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand.
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand.
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Pongpanit T, Saeteaw T, Chumsaeng P, Chasing P, Phomphrai K. Highly Active Homoleptic Zinc and Magnesium Complexes Supported by Constrained Reduced Schiff Base Ligands for the Ring-Opening Polymerization of Lactide. Inorg Chem 2021; 60:17114-17122. [PMID: 34605644 DOI: 10.1021/acs.inorgchem.1c02382] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
New homoleptic zinc and magnesium complexes containing constrained reduced Schiff base ligands based on substituted 7-hydroxy-1-indanone were successfully synthesized and used as a catalyst for the polymerization of lactide. The ligands contain a side arm having different basicity because dimethylamino, pyridyl, and furfuryl groups are shown to greatly affect the polymerization rates. The homoleptic zinc complex containing constrained reduced Schiff base ligands and a dimethylamino side arm was highly active, giving a 92% conversion of l-lactide in 3 min using [LA]:[Zn]:[BnOH] = 500:1:2 at room temperature. The polymerization is pseudo-first-order dependent on the LA concentration. Well-controlled and living behavior of the zinc complex was observed and demonstrated in the preparation of stereodiblock and triblock copolymers of l-, d-, and rac-lactide in a one-pot sequential synthesis with a predictable block length, block sequence, and narrow dispersity rapidly in 10 min. Stereocomplex formation was observed for PLA made sequentially from 100 l-LA, 100 rac-LA, and 100 d-LA having a high Tm of up to 220 °C.
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Affiliation(s)
- Tanyawan Pongpanit
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
| | - Thonthun Saeteaw
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
| | - Phongnarin Chumsaeng
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
| | - Pongsakorn Chasing
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
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10
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Yu X, Wang Z, Han Z. Synthesis and Structural Characterisation of Dinuclear Aluminium Complexes Supported by NNO‐Tridentate Schiff‐Base Ligands and Their Catalysis in the Ring‐Opening Polymerisation of ϵ‐Caprolactone. ChemistrySelect 2021. [DOI: 10.1002/slct.202100635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Xiaofeng Yu
- School of Materials and Chemical Engineering University Bengbu 1866 Caoshan Road Anhui 233030 P. R. China
- Department of Chemistry University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 P. R. China
- Bengbu Product Quality and Inspection Institute 100 Anmin Road Bengbu Anhui 233030 P. R. China
| | - Zhongxia Wang
- Department of Chemistry University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 P. R. China
| | - Zhiyong Han
- Department of Chemistry University of Science and Technology of China 96 Jinzhai Road Hefei Anhui 230026 P. R. China
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11
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Wang TW, Golder MR. Advancing macromolecular hoop construction: recent developments in synthetic cyclic polymer chemistry. Polym Chem 2021. [DOI: 10.1039/d0py01655a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Synthetic methodology to access cyclic macromolecules continues to develop via two distinct mechanistic classes: ring-expansion of macrocyclic initiators and ring-closure of functionalized linear polymers.
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Affiliation(s)
- Teng-Wei Wang
- Department of Chemistry
- University of Washington
- Seattle
- USA
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12
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Basu Baul TS, Addepalli MR, Lyčka A, van Terwingen S, Englert U. Synthesis, characterization and structural systematics in diorganotin complexes with O,N,O'-tris-chelating semirigid diaza-scaffolds: Mono- vs. di-nuclear compounds. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121522] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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13
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Ungpittagul T, Jaenjai T, Roongcharoen T, Namuangruk S, Phomphrai K. Unprecedented Double Insertion of Cyclohexene Oxide in Ring-Opening Copolymerization with Cyclic Anhydrides Catalyzed by a Tin(II) Alkoxide Complex. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01738] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Thasanaporn Ungpittagul
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
| | - Tiphanan Jaenjai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
| | - Thantip Roongcharoen
- National Nanotechnology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani 12120, Thailand
| | - Supawadee Namuangruk
- National Nanotechnology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani 12120, Thailand
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
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14
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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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15
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Virachotikul A, Laiwattanapaisarn N, Wongmahasirikun P, Piromjitpong P, Chainok K, Phomphrai K. Ring-Opening Copolymerizaton of Cyclohexene Oxide and Succinic Anhydride by Zinc and Magnesium Schiff-Base Complexes Containing Alkoxy Side Arms. Inorg Chem 2020; 59:8983-8994. [PMID: 32408738 DOI: 10.1021/acs.inorgchem.0c00839] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The ring-opening copolymerization (ROCOP) of epoxides and cyclic anhydrides is a promising method for the synthesis of new polyesters with various polymer properties. Among previously reported metal catalysts for ROCOP, the Schiff-base complexes have gained significant attention because of their ease of synthesis and modification. In this work, zinc and magnesium complexes containing Schiff-base ligands with different alkoxy side arms [-(CH2)2O- and -(CH2)3O-] were synthesized and shown to have a cubane metal core by X-ray crystal structures. All complexes were studied in the ROCOP of cyclohexene oxide (CHO) and succinic anhydride (SA) in toluene at 110 °C. The zinc complex having a shorter side arm is the most active catalyst for copolymerization, giving poly(CHO-alt-SA) with narrow dispersity and negligible ether linkage. On the other hand, magnesium complexes were not active because of the formation of stable carboxylate species. The detailed analysis of polyester obtained from zinc complexes unexpectedly revealed three different types of polymer structures occurring at different polymerization times. Cyclic polymer was generated at the beginning by intramolecular transesterification of the alkoxy side arm, giving a low-molecular-weight polyester. At higher conversion, cyclization diminished, giving just a linear polyester but with minor competitive formation of higher-molecular-weight polyester having cyclohexanediol as an end group. On the basis of a thorough understanding of the polymerization mechanism, the desired cyclic poly(CHO-alt-SA) was successfully synthesized using a low monomer/catalyst ratio.
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Affiliation(s)
- Arnut Virachotikul
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand
| | - Nattiya Laiwattanapaisarn
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand
| | - Phonpimon Wongmahasirikun
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand
| | - Parichat Piromjitpong
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand
| | - Kittipong Chainok
- Materials and Textile Technology, Faculty of Science and Technology, Thammasat University, Khlong Luang, Pathum Thani 12121, Thailand
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wangchan, Rayong 21210, Thailand.,Research Network of NANOTEC-VISTEC on Nanotechnology for Energy, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand
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16
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Ungpittagul T, Wongmahasirikun P, Phomphrai K. Synthesis and characterization of guanidinate tin(ii) complexes for ring-opening polymerization of cyclic esters. Dalton Trans 2020; 49:8460-8471. [PMID: 32315017 DOI: 10.1039/d0dt01115k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Novel homoleptic and heteroleptic (guanidinate)tin(ii) complexes were successfully synthesized and structurally characterized. The first heteroleptic (guanidinato)tin(ii) alkoxide complex was synthesized but found to be unstable leading to the corresponding bis(guanidinate)tin(ii) complex. The catalytic activities of bis(guanidinate)tin(ii) complexes having different substituents at the nitrogen atoms (isopropyl (1), cyclohexyl (2), and p-tolyl (3)) were investigated in the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) and lactide (LA). The lone-pair electrons of the tin(ii) atom were proposed to act as an initiator similar to N-heterocyclic carbenes. Among the synthesized catalysts, complex 1 having less steric hindrance efficiently catalyzed both homo- and copolymerizations of ε-CL and LA giving high molecular weight cyclic polyesters. Transesterification was found to be the major contributor to the cyclization to cyclic polyesters.
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Affiliation(s)
- Thasanaporn Ungpittagul
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong 21210, Thailand.
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17
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Praban S, Yimthachote S, Kiriratnikom J, Chotchatchawankul S, Tantirungrotechai J, Phomphrai K. Synthesis and characterizations of bis(phenoxy)‐amine tin(II) complexes for ring‐opening polymerization of lactide. ACTA ACUST UNITED AC 2019. [DOI: 10.1002/pola.29479] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Siriwan Praban
- Center for Catalysis, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of ScienceMahidol University Rama 6 Road Bangkok 10400 Thailand
| | - Supajittra Yimthachote
- Department of Materials Science and Engineering, School of Molecular Science and EngineeringVidyasirimedhi Institute of Science and Technology, Wangchan Rayong 21210 Thailand
| | - Jiraya Kiriratnikom
- Center for Catalysis, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of ScienceMahidol University Rama 6 Road Bangkok 10400 Thailand
| | - Sucheewin Chotchatchawankul
- Department of Materials Science and Engineering, School of Molecular Science and EngineeringVidyasirimedhi Institute of Science and Technology, Wangchan Rayong 21210 Thailand
| | - Jonggol Tantirungrotechai
- Center for Catalysis, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of ScienceMahidol University Rama 6 Road Bangkok 10400 Thailand
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering, School of Molecular Science and EngineeringVidyasirimedhi Institute of Science and Technology, Wangchan Rayong 21210 Thailand
- Research Network of NANOTEC‐VISTEC on Nanotechnology for Energy, Vidyasirimedhi Institute of Science and Technology, Wangchan Rayong 21210 Thailand
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18
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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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19
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Praban S, Piromjitpong P, Balasanthiran V, Jayaraj S, Chisholm MH, Tantirungrotechai J, Phomphrai K. Highly efficient metal(iii) porphyrin and salen complexes for the polymerization of rac-lactide under ambient conditions. Dalton Trans 2019; 48:3223-3230. [DOI: 10.1039/c8dt04699a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Metal(iii) complexes supported by porphyrin and salen ligands were highly efficient for rac-lactide polymerization at room temperature giving isotactic-enriched PLA.
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Affiliation(s)
- Siriwan Praban
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
| | - Parichat Piromjitpong
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
| | | | - Savithra Jayaraj
- Department of Chemistry and Biochemistry
- The Ohio State University
- Columbus
- USA
| | - Malcolm H. Chisholm
- Department of Chemistry and Biochemistry
- The Ohio State University
- Columbus
- USA
| | - Jonggol Tantirungrotechai
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
| | - Khamphee Phomphrai
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology
- Wangchan
- Thailand
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20
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Mase N, Moniruzzaman, Yamamoto S, Nakaya Y, Sato K, Narumi T. Organocatalytic Stereoselective Cyclic Polylactide Synthesis in Supercritical Carbon Dioxide under Plasticizing Conditions. Polymers (Basel) 2018; 10:E713. [PMID: 30960638 PMCID: PMC6404224 DOI: 10.3390/polym10070713] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 06/23/2018] [Accepted: 06/26/2018] [Indexed: 11/16/2022] Open
Abstract
Cyclic polylactide (cPLA) is a structural isomer of linear polylactide (PLA) although it possesses unique functionalities in comparison to its linear counterpart. Hitherto, the control of stereochemical purity in conventional cPLA synthesis has not been achieved. In this study, highly stereochemically pure cPLA was synthesized in the absence of a metal catalyst and organic solvent, which required high consumption of the residual monomer. The synthesis was conducted in supercritical carbon dioxide under CO₂ plasticizing polymerization conditions in the presence of an organocatalyst and thiourea additives. In comparison with the stereocomplexes synthesized through conventional methods, cPLA from l-lactide (cPLLA) and cPLA from d-lactide (cPDLA) were synthesized with higher stereochemical purity and improved thermal stability. Moreover, the method presented herein is environmentally friendly and thus, applicable on an industrial level.
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Affiliation(s)
- Nobuyuki Mase
- Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan; (M.); (S.Y.); (Y.N.); (K.S.); (T.N.)
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
- Research Institute of Green Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
| | - Moniruzzaman
- Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan; (M.); (S.Y.); (Y.N.); (K.S.); (T.N.)
| | - Shoji Yamamoto
- Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan; (M.); (S.Y.); (Y.N.); (K.S.); (T.N.)
| | - Yoshitaka Nakaya
- Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan; (M.); (S.Y.); (Y.N.); (K.S.); (T.N.)
| | - Kohei Sato
- Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan; (M.); (S.Y.); (Y.N.); (K.S.); (T.N.)
| | - Tetsuo Narumi
- Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan; (M.); (S.Y.); (Y.N.); (K.S.); (T.N.)
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
- Research Institute of Green Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
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21
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Li P, Xi Y, Li L, Li H, Sun WH, Lei M. A DFT study on ring-opening polymerization of ε-caprolactone initiated by Mg and Al complexes. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.02.033] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Ou HW, Lu WY, Vandavasi JK, Lin YF, Chen HY, Lin CC. Improvement in titanium complexes supported by Schiff bases in ring-opening polymerization of cyclic esters: ONO-tridentate Schiff bases. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.02.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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Chang YA, Waymouth RM. Recent progress on the synthesis of cyclic polymers via ring-expansion strategies. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28635] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Young A. Chang
- Department of Chemistry; Stanford University; Stanford California 94305
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24
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Balasanthiran V, Chisholm MH, Choojun K, Durr CB, Wambua PM. TMPZnN(SiMe3)2, [TMPZn(μ-O Pr)]2 and TMPZn[OCMe2C(O)OEt]. Their role in the ring-opening of rac-lactide and ε-caprolactone where TMP = 1,5,9-trimesityldipyrromethene. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.01.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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25
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Chuang WJ, Huang YT, Chen YH, Lin YS, Lu WY, Lai YC, Chiang MY, Hsu SCN, Chen HY. Synthesis, characterization, and catalytic activity of sodium ketminiate complexes toward the ring-opening polymerization of l-lactide. RSC Adv 2016. [DOI: 10.1039/c6ra00373g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Na complexes bearing ketiminate ligands revealed the greater catalytic activity and polymer controllability than that of Na complexes bearing Schiff base ligands.
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Affiliation(s)
- Wan-Jung Chuang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yen-Tzu Huang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yu-Hsieh Chen
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yu-Shan Lin
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Wei-Yi Lu
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yi-Chun Lai
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Michael Y. Chiang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
- Department of Chemistry
| | - Sodio C. N. Hsu
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
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26
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Li J, Deng Y, Jie S, Li BG. Zinc complexes supported by (benzimidazolyl)pyridine alcohol ligands as highly efficient initiators for ring-opening polymerization of ε-caprolactone. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.08.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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