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Sagar S, Nath P, Ray A, Sarkar A, Panda TK. Crafting sustainable solutions: architecting biodegradable copolymers through controlled ring-opening copolymerization. Dalton Trans 2024; 53:12837-12866. [PMID: 38973394 DOI: 10.1039/d4dt01054j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/09/2024]
Abstract
Polylactic acid (PLA) is a biodegradable and biocompatible polymer with versatile applications in packaging and medicine. It is derived from lactic acid and thus represents an eco-friendly option sourced from renewable raw materials. Despite its advantages, PLA exhibits few drawbacks, such as brittleness and relatively high melting and glass transition temperatures. However, these limitations can be addressed through copolymerization with other monomers like ε-caprolactone (ε-CL), resulting in a composite material with improved physical properties. This paper comprehensively reviews achievements in PLA-PCL copolymerization using organometallic catalysts, discussing scientific findings and various copolymer architectures obtained, including random or block configurations. It also demonstrates various sustainable catalysts for achieving the required microstructure under mild reaction conditions without the aid of any external initiator.
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Affiliation(s)
- Shweta Sagar
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
| | - Priyanku Nath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
| | - Aranya Ray
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
| | - Alok Sarkar
- Momentive Performance Materials Pvt. Ltd, Survey No. 09, Hosur Road, Electronic City (West), Bangalore-560100, India
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
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2
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Capacchione C, Grisi F, Lamberti M, Mazzeo M, Milani B, Milione S, Pappalardo D, Zuccaccia C, Pellecchia C. Metal Catalyzed Polymerization: From Stereoregular Poly(α‐olefins) to Tailor‐Made Biodegradable/Biorenewable Polymers and Copolymers. Eur J Inorg Chem 2023. [DOI: 10.1002/ejic.202200644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Carmine Capacchione
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Fabia Grisi
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Marina Lamberti
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Mina Mazzeo
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Barbara Milani
- Dipartimento di Scienze Chimiche e Farmaceutiche Università di Trieste Via Licio Giorgieri 1 34127 Trieste Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Stefano Milione
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Daniela Pappalardo
- Dipartimento di Scienze e Tecnologie Università del Sannio Via de Sanctis snc 82100 Benevento Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Cristiano Zuccaccia
- Dipartimento di Chimica, Biologia e Biotecnologie Università di Perugia Via Elce di Sotto 8 06132 Perugia Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
| | - Claudio Pellecchia
- Dipartimento di Chimica e Biologia “A. Zambelli” Università di Salerno via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
- Consorzio per la Reattività Chimica e la Catalisi (CIRCC) Via Celso Ulpiani 27 70126 Bari Italy
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3
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Ring opening polymerization of lactide promoted by Zinc and Magnesium complexes with a N-heterocyclic carbene-phenoxy-imine hybrid non-innocent ligand. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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4
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D'Auria I, Lamberti M, Rescigno R, Venditto V, Mazzeo M. Copolymerization of L-Lactide and ε-Caprolactone promoted by zinc complexes with phosphorus based ligands. Heliyon 2021; 7:e07630. [PMID: 34381896 PMCID: PMC8339243 DOI: 10.1016/j.heliyon.2021.e07630] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 07/02/2021] [Accepted: 07/20/2021] [Indexed: 11/04/2022] Open
Abstract
The zinc complexes 1 and 2 bearing chelating phosphorous based pincer ligands were found to catalyze the ring-opening copolymerization of L-lactide and ε-caprolactone in the melt at 110 °C to obtain a series of random copolymers in which the monomer distributions were coherent with the monomer ratio in the feed. All the obtained copolymers showed high molecular masses with monomodal and moderately narrow distributions. The thermal properties of the achieved copolymers (Tg, glass transition temperature, and Tm, melting temperature) were strongly dependent on their composition. A linear dependence of Tg with molar percentage of lactide in the copolymers was observed over a temperature range from -59 °C (pure polycaprolactone) to 55 °C (pure polylactide).
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Affiliation(s)
- Ilaria D'Auria
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
| | - Marina Lamberti
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
| | - Raffaella Rescigno
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
| | - Vincenzo Venditto
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy.,INSTM Research Unit, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy
| | - Mina Mazzeo
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Salerno, Italy
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5
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Naddeo M, Sorrentino A, Pappalardo D. Thermo-Rheological and Shape Memory Properties of Block and Random Copolymers of Lactide and ε-Caprolactone. Polymers (Basel) 2021; 13:627. [PMID: 33669678 PMCID: PMC7922056 DOI: 10.3390/polym13040627] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/11/2021] [Accepted: 02/16/2021] [Indexed: 12/23/2022] Open
Abstract
Biodegradable block and random copolymers have attracted numerous research interests in different areas, due to their capability to provide a broad range of properties. In this paper, an efficient strategy has been reported for preparing biodegradable PCL-PLA copolymers with improved thermal, mechanical and rheological properties. Two block-copolymers are synthesized by sequential addition of the cyclic esters lactide (L-LA or D,L-LA) and ε-caprolactone (CL) in presence of a dimethyl(salicylaldiminato)aluminium compound. The random copolymer of L-LA and CL was synthetized by using the same catalyst. Chain structure, molar mass, thermal, rheological and mechanical properties are characterized by NMR, SEC, TGA, DSC, Rheometry and DMTA. Experimental results show that by changing the stereochemistry and monomer distribution of the copolymers it is possible to obtain a variety of properties. Promising shape-memory properties are also observed in the di-block copolymers characterized by the co-crystallization of CL and L-LA segments. These materials show great potential to substitute oil-based polymers for packaging, electronics, and medicine applications.
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Affiliation(s)
- Marco Naddeo
- Dipartimento di Scienze e Tecnologie, Università del Sannio, via de Sanctis snc, 82100 Benevento, Italy;
| | - Andrea Sorrentino
- Institute for Polymers, Composites and Biomaterials (IPCB-CNR), P.le E Fermi, 1, 80055 Portici, Italy
| | - Daniela Pappalardo
- Dipartimento di Scienze e Tecnologie, Università del Sannio, via de Sanctis snc, 82100 Benevento, Italy;
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6
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Dong X, Robinson JR. The role of neutral donor ligands in the isoselective ring-opening polymerization of rac-β-butyrolactone. Chem Sci 2020; 11:8184-8195. [PMID: 34123089 PMCID: PMC8163396 DOI: 10.1039/d0sc03507f] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Isoenriched poly-3-hydroxybutyrate (P3HB) is a biodegradable material with properties similar to isotactic polypropylene, yet efficient routes to this material are lacking after 50+ years of extensive efforts in catalyst design. In this contribution, a novel lanthanum aminobisphenolate catalyst (1-La) can access isoenriched P3HB through the stereospecific ring-opening polymerization (ROP) of rac-β-butyrolactone (rac-BBL). Replacing the tethered donor group of a privileged supporting ligand with a non-coordinating benzyl substituent generates a catalyst whose reactivity and selectivity can be tuned with inexpensive achiral neutral donor ligands (e.g. phosphine oxides, OPR3). The 1-La/OPR3 (R = n-octyl, Ph) systems display high activity and are the most isoselective homogeneous catalysts for the ROP of rac-BBL to date (0 °C: Pm = 0.8, TOF ∼190 h−1). Combined reactivity and spectroscopic studies provide insight into the active catalyst structure and ROP mechanism. Both 1-La(TPPO)2 and a structurally related catalyst with a tethered donor group (2-Y) operate under chain-end stereocontrol; however, 2-RE favors formation of P3HB with opposite tacticity (syndioenriched) and its ROP activity and selectivity are totally unaffected by added neutral donor ligands. Our studies uncover new roles for neutral donor ligands in stereospecific ROP, including suppression of chain-scission events, and point to new opportunities for catalyst design. Simple achiral neutral donor ligands modify catalyst structure and function to enable access to isoenriched poly-3-hydroxybutyrate, a biodegradable material with properties similar to isotactic polypropylene.![]()
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Affiliation(s)
- Xiang Dong
- Department of Chemistry, Brown University 324 Brook St. Providence RI 02912 USA
| | - Jerome R Robinson
- Department of Chemistry, Brown University 324 Brook St. Providence RI 02912 USA
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7
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Ring-opening Copolymerization of ε-Caprolactone and δ-Valerolactone Catalyzed by a 2,6-Bis(amino)phenol Zinc Complex. CHINESE JOURNAL OF POLYMER SCIENCE 2019. [DOI: 10.1007/s10118-020-2347-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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8
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Lyubov DM, Tolpygin AO, Trifonov AA. Rare-earth metal complexes as catalysts for ring-opening polymerization of cyclic esters. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.04.013] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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9
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Preparation and Characterization of Poly(δ-Valerolactone)/TiO 2 Nanohybrid Material with Pores Interconnected for Potential Use in Tissue Engineering. MATERIALS 2019; 12:ma12030528. [PMID: 30744189 PMCID: PMC6385029 DOI: 10.3390/ma12030528] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 01/24/2019] [Accepted: 02/06/2019] [Indexed: 12/23/2022]
Abstract
Titanium dioxide/poly(δ-valerolactone) (TiO2/Pδ-VL) nanohybrid material containing interconnected pores with sizes in the range 80–150 μm were prepared by the solvent casting and polymer melting routes, and the dispersion of the TiO2 nanofiller in the Pδ-VL matrix and its adhesion were characterized by X-ray diffraction, differential scanning calorimetry, and scanning electron microscopy. A significant depression in the glass transition temperature (Tg) and melting temperature (Tm) values were revealed for the polymer nanocomposites prepared by the solvent casting technique. For the potential application of the prepared materials in the biomedical domain, complementary analyses were performed to examine the dynamic mechanical properties, and cell adhesion (using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay), and the results obtained for the samples prepared by the two methods were compared. Interconnected pores were successively produced in the new material by employing naphthalene microparticles as a porogen for the first time, and the results obtained were very promising.
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10
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Thermal Properties and Non-Isothermal Crystallization Kinetics of Poly (δ-Valerolactone) and Poly (δ-Valerolactone)/Titanium Dioxide Nanocomposites. CRYSTALS 2018. [DOI: 10.3390/cryst8120452] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
New poly (δ-valerolactone)/titanium dioxide (PDVL/TiO2) nanocomposites with different TiO2 nanoparticle loadings were prepared by the solvent-casting method and characterized by Fourier transform infra-red, differential scanning calorimetry, X-ray diffraction and scanning electron microscopy, and thermogravimetry analyses. The results obtained reveal good dispersion of TiO2 nanoparticles in the polymer matrix and non-formation of new crystalline structures indicating the stability of the crystallinity of TiO2 in the composite. A significant increase in the degree of crystallinity was observed with increasing TiO2 content. The non-isothermal crystallization kinetics of the PDVL/TiO2 system indicate that the crystallization process involves the simultaneous occurrence of two- and three-dimensional spherulitic growths. The thermal degradation analysis of this nanocomposite reveals a significant improvement in the thermal stability with increasing TiO2 loading.
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11
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Saeed WS, Al-Odayni AB, Ali Alghamdi A, Abdulaziz Al-Owais A, Semlali A, Aouak T. Miscibility of Poly(Ethylene-co-Vinylalcohol)/Poly(δ-Valerolactone) Blend and Tissue Engineering Scaffold Fabrication Using Naphthalene as Porogen. POLYM-PLAST TECH MAT 2018. [DOI: 10.1080/03602559.2018.1466176] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Waseem Sharaf Saeed
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Abdel-Basit Al-Odayni
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | | | | | - Abdelhabib Semlali
- Biochemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Taieb Aouak
- Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia
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12
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Isnard F, Carratù M, Lamberti M, Venditto V, Mazzeo M. Copolymerization of cyclic esters, epoxides and anhydrides: evidence of the dual role of the monomers in the reaction mixture. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01174e] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A block copolyester derived from ROCOP of CHO/SA followed by ROP of ε-CL was obtained from the mixture of monomers. The lactone comonomer acts as an endogen cocatalyst during the SA/CHO ROCOP step and as a monomer during ROP.
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Affiliation(s)
- Florence Isnard
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- 84084 Fisciano (SA)
- Italy
| | - Mario Carratù
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- 84084 Fisciano (SA)
- Italy
| | - Marina Lamberti
- Department of Physics “E. Caianiello”
- University of Salerno
- 132 84084 Fisciano (SA)
- Italy
| | - Vincenzo Venditto
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- 84084 Fisciano (SA)
- Italy
| | - Mina Mazzeo
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- 84084 Fisciano (SA)
- Italy
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13
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Bello-Vieda NJ, Murcia RA, Muñoz-Castro A, Macías MA, Hurtado JJ. Coordination Polymers Containing 1,3-Phenylenebis-((1H-1,2,4-triazol-1-yl)methanone) Ligand: Synthesis and ε-Caprolactone Polymerization Behavior. Molecules 2017; 22:molecules22111860. [PMID: 29125574 PMCID: PMC6150338 DOI: 10.3390/molecules22111860] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 10/23/2017] [Accepted: 10/26/2017] [Indexed: 11/30/2022] Open
Abstract
The reaction of isophthaloyl dichloride with 1H-1,2,4-triazole afforded the new ligand 1,3-phenylenebis(1,2,4-triazole-1-yl)methanone (1). A series of Co(II), Cu(II), Zn(II) and Ni(II) complexes were synthesized using 1 and then characterized by melting point analysis, elemental analysis, theoretical calculations, thermogravimetric analysis, X-ray powder diffraction, nuclear magnetic resonance, infrared and Raman spectroscopy. Experimental and computational studies predict the formation of coordination polymers (CPs). The cobalt and copper CPs and zinc(II) complex were found to be good initiators for the ring-opening polymerization of ε-caprolactone (CL) under solvent-free conditions. 1H-NMR analysis showed that the obtained polymers of CL were mainly linear and had terminal hydroxymethylene groups. Differential scanning calorimetry showed that the obtained polycaprolactones had high crystallinity, and TGA showed that they had decomposition temperatures above 400 °C. These results provide insight and guidance for the design of metal complexes with potential applications in the polymerization of CL.
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Affiliation(s)
- Nestor J Bello-Vieda
- Department of Chemistry, Universidad de los Andes, Carrera 1 N° 18A-12, Bogotá 111711, Colombia.
| | - Ricardo A Murcia
- Department of Chemistry, Universidad de los Andes, Carrera 1 N° 18A-12, Bogotá 111711, Colombia.
| | - Alvaro Muñoz-Castro
- Grupo de Química Inorgánica y Materiales Moleculares, Universidad Autonoma de Chile, El Llano Subercaseaux 2801, Santiago 8910060, Chile.
- Relativistic Molecular Physics (ReMoPh) Group, Universidad Andres Bello, Republica 275, Santiago, Chile.
| | - Mario A Macías
- Department of Chemistry, Universidad de los Andes, Carrera 1 N° 18A-12, Bogotá 111711, Colombia.
| | - John J Hurtado
- Department of Chemistry, Universidad de los Andes, Carrera 1 N° 18A-12, Bogotá 111711, Colombia.
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14
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El Mahdi A, M'sahel M, Medimagh R. Catalyst-Free Ring Opening Synthesis of Biodegradable Poly(ester-urethane)s Using Isosorbide Bio-Based Initiator. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700077] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ayoub El Mahdi
- Laboratoire des Substances Naturelles (LSN); Institut National de Recherche et d'Analyse Physico-chimique (INRAP); Pôle technologique de Sidi Thabet; 2020 Ariana Tunisia
- Faculté des Science de Tunis; Université de Tunis El-Manar; 2020 Tunis Tunisia
| | - Malek M'sahel
- Laboratoire des Substances Naturelles (LSN); Institut National de Recherche et d'Analyse Physico-chimique (INRAP); Pôle technologique de Sidi Thabet; 2020 Ariana Tunisia
- Faculté des Science de Tunis; Université de Tunis El-Manar; 2020 Tunis Tunisia
| | - Raouf Medimagh
- Laboratoire des Substances Naturelles (LSN); Institut National de Recherche et d'Analyse Physico-chimique (INRAP); Pôle technologique de Sidi Thabet; 2020 Ariana Tunisia
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15
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Cota I. Developments in the use of rare earth metal complexes as efficient catalysts for ring-opening polymerization of cyclic esters used in biomedical applications. PHYSICAL SCIENCES REVIEWS 2017. [DOI: 10.1515/psr-2016-0129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractBiodegradable polymers represent a class of particularly useful materials for many biomedical and pharmaceutical applications. Among these types of polyesters, poly(ε-caprolactone) and polylactides are considered very promising for controlled drug delivery devices. These polymers are mainly produced by ring-opening polymerization of their respective cyclic esters, since this method allows a strict control of the molecular parameters (molecular weight and distribution) of the obtained polymers. The most widely used catalysts for ring-opening polymerization of cyclic esters are tin- and aluminium-based organometalliccomplexes; however since the contamination of the aliphatic polyesters by potentially toxic metallic residues is particularly of concern for biomedical applications, the possibility of replacing organometallic initiators by novel less toxic or more efficient organometallic complexes has been intensively studied. Thus, in the recent years, the use of highly reactive rare earth initiators/catalysts leading to lower polymer contamination has been developed. The use of rare earth complexes is considered a valuable strategy to decrease the polyester contamination by metallic residues and represents an attractive alternative to traditional organometallic complexes.
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16
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Lye DS, Cohen AE, Wong MZ, Weck M. End-Functionalized Palladium SCS Pincer Polymers via Controlled Radical Polymerizations. Macromol Rapid Commun 2017; 38. [PMID: 28544248 DOI: 10.1002/marc.201700174] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 04/21/2017] [Indexed: 11/05/2022]
Abstract
A direct and facile route toward semitelechelic polymers, end-functionalized with palladated sulfur-carbon-sulfur pincer (PdII -pincer) complexes is reported that avoids any post-polymerization step. Key to our methodology is the combination of reversible addition-fragmentation chain-transfer (RAFT) polymerization with functionalized chain-transfer agents. This strategy yields Pd end-group-functionalized materials with monomodal molar mass dispersities (Đ) of 1.18-1.44. The RAFT polymerization is investigated using a PdII -pincer chain-transfer agent for three classes of monomers: styrene, tert-butyl acrylate, and N-isopropylacrylamide. The ensuing PdII -pincer end-functionalized polymers are analyzed using 1 H NMR spectroscopy, gel-permeation chromatography, and elemental analysis. The RAFT polymerization methodology provides a direct pathway for the fabrication of PdII -pincer functionalized polymers with complete end-group functionalization.
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Affiliation(s)
- Diane S Lye
- Molecular Design Institute and Department of Chemistry, New York University, 100 Washington Square East, NY, 10003, USA
| | - Aaron E Cohen
- Molecular Design Institute and Department of Chemistry, New York University, 100 Washington Square East, NY, 10003, USA
| | - Madeleine Z Wong
- Molecular Design Institute and Department of Chemistry, New York University, 100 Washington Square East, NY, 10003, USA
| | - Marcus Weck
- Molecular Design Institute and Department of Chemistry, New York University, 100 Washington Square East, NY, 10003, USA
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17
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Ebrahimi T, Aluthge DC, Hatzikiriakos SG, Mehrkhodavandi P. Highly Active Chiral Zinc Catalysts for Immortal Polymerization of β-Butyrolactone Form Melt Processable Syndio-Rich Poly(hydroxybutyrate). Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01908] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Tannaz Ebrahimi
- Department of Chemistry and ‡Department of
Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Dinesh C. Aluthge
- Department of Chemistry and ‡Department of
Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Savvas G. Hatzikiriakos
- Department of Chemistry and ‡Department of
Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry and ‡Department of
Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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18
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Duan YL, He JX, Wang W, Zhou JJ, Huang Y, Yang Y. Synthesis and characterization of dinuclear rare-earth complexes supported by amine-bridged bis(phenolate) ligands and their catalytic activity for the ring-opening polymerization of l-lactide. Dalton Trans 2016; 45:10807-20. [PMID: 27294827 DOI: 10.1039/c6dt01486k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of amine-bridged bis(phenolate) protio-ligands N,N-bis(3,5-di-tert-butyl-2-hydroxybenzyl)aminoacetic acid (L(1)-H3) and N,N-bis[3,5-bis(α,α'-dimethylbenzyl)-2-hydroxybenzyl]aminoacetic acid (L(2)-H3), with 1 equiv. M[N(SiMe3)2]3 (M = La, Nd, Sm, Gd, Y) in THF at room temperature yielded the neutral rare-earth complexes [M2(L)2(THF)4] (L = L(1), M = La (), Nd (), Sm (), Gd (), Y (); L = L(2), M = La (), Nd (), Sm (), Gd (), Y ()). All of these complexes were characterized by single-crystal X-ray diffraction, elemental analysis and in the case of yttrium and lanthanum complexes, (1)H NMR spectroscopy. The molecular structure of revealed dinuclear species in which the eight-coordinate lanthanum centers were bonded to two oxygen atoms of two THF molecules, to three oxygen atoms and one nitrogen atom of one L(1) ligand, and two oxygen atoms of the carboxyl group of another. Complexes were also dinuclear species containing seven-coordinate metal centers similar to , albeit with bonding to one rather than two carboxyl group oxygens of another ligand. Further treatment of with excess benzyl alcohol provided dinuclear complex [La2(L(1))2(BnOH)6] (), in which each lanthanum ion is eight-coordinate, bonded to three oxygen atoms and one nitrogen atom of one ligand, three oxygen atoms of three BnOH molecules, as well as one oxygen atom of bridging carboxyl group of the other ligand. In the presence of BnOH, complexes efficiently catalyzed the ring-opening polymerization of l-lactide in a controlled manner and gave polymers with relatively narrow molecular weight distributions. The kinetic and mechanistic studies associated with the ROP of l-lactide using /BnOH initiating system have been performed.
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Affiliation(s)
- Yu-Lai Duan
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Jia-Xuan He
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Wei Wang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Jing-Jing Zhou
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Yong Huang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Ying Yang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
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19
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Bai J, Wu N, Wang Y, Li Q, Wang X, Zhang L. Triblock and pentablock copolymerizations of ε-caprolactone with l-lactide catalyzed by N-heterocyclic carbene. RSC Adv 2016. [DOI: 10.1039/c6ra24042a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
B-12-C-4imY exhibit the characteristics of a “living” ROP and highly active for the ROP of LLA and ε-CL. Copolymers prepared possess predictable molecular weights, narrow polydispersities, and high end-group fidelity.
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Affiliation(s)
- Junhua Bai
- School of Chemistry & Material Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
| | - Ni Wu
- School of Chemistry & Material Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
| | - Yan Wang
- School of Chemistry & Material Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
| | - Qianru Li
- School of Chemistry & Material Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
| | - Xiaoqi Wang
- School of Chemistry & Material Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
| | - Lifang Zhang
- School of Chemistry & Material Science
- Shanxi Normal University
- Linfen 041004
- P. R. China
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20
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Huang HC, Wang B, Zhang YP, Li YS. Bimetallic aluminum complexes with cyclic β-ketiminato ligands: the cooperative effect improves their capability in polymerization of lactide and ε-caprolactone. Polym Chem 2016. [DOI: 10.1039/c6py01092j] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Novel binuclear aluminum complexes bearing β-ketiminato ligands were synthesized and characterized. The cooperative effect around the metal centers played a key role in improving catalytic activity.
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Affiliation(s)
- Hai-Chao Huang
- Tianjin Key Lab Composite & Functional Materials
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Bin Wang
- Tianjin Key Lab Composite & Functional Materials
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Yan-Ping Zhang
- Tianjin Key Lab Composite & Functional Materials
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Yue-Sheng Li
- Tianjin Key Lab Composite & Functional Materials
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- China
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21
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Hänninen MM, Zamora MT, Hayes PG. Rare Earth Pincer Complexes: Synthesis, Reaction Chemistry, and Catalysis. TOP ORGANOMETAL CHEM 2015. [DOI: 10.1007/3418_2015_120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Della Monica F, Luciano E, Buonerba A, Grassi A, Milione S, Capacchione C. Poly(lactide-co-ε-caprolactone) copolymers prepared using bis-thioetherphenolate group 4 metal complexes: synthesis, characterization and morphology. RSC Adv 2014. [DOI: 10.1039/c4ra10255j] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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23
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Della Monica F, Luciano E, Roviello G, Grassi A, Milione S, Capacchione C. Group 4 Metal Complexes Bearing Thioetherphenolate Ligands. Coordination Chemistry and Ring-Opening Polymerization Catalysis. Macromolecules 2014. [DOI: 10.1021/ma5003358] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francesco Della Monica
- Department
of Chemistry and Biology, University of Salerno, via Giovanni Paolo II, 132 Fisciano I-84084, Salerno, Italy
| | - Ermanno Luciano
- Department
of Chemistry and Biology, University of Salerno, via Giovanni Paolo II, 132 Fisciano I-84084, Salerno, Italy
| | - Giuseppina Roviello
- Department
of Engeneering, University of Naples, Parthenope Centro Direzionale Napoli Isola C4, 80143 Napoli, Italy
| | - Alfonso Grassi
- Department
of Chemistry and Biology, University of Salerno, via Giovanni Paolo II, 132 Fisciano I-84084, Salerno, Italy
| | - Stefano Milione
- Department
of Chemistry and Biology, University of Salerno, via Giovanni Paolo II, 132 Fisciano I-84084, Salerno, Italy
| | - Carmine Capacchione
- Department
of Chemistry and Biology, University of Salerno, via Giovanni Paolo II, 132 Fisciano I-84084, Salerno, Italy
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24
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Whitehorne TJ, Schaper F. Lactide, β-butyrolactone, δ-valerolactone, and ε-caprolactone polymerization with copper diketiminate complexes. CAN J CHEM 2014. [DOI: 10.1139/cjc-2013-0392] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pseudo-first-order rate constants for the polymerization of rac-lactide with dimeric (nacnacBnCu(μ-OiPr))2 (nacnacBn = deprotonated N,N′-dibenzyl-2-amino-4-imino-pent-2-ene), 1, in acetonitrile, THF, dichloromethane, and toluene are kobs = 2.4(1), 5.3(5), 3.6–4.4, and 10(1) min−1, respectively (25 °C, 1.0 mmol L−1 1). A bimodal polymer molecular weight distribution is obtained in toluene, narrow polydispersities of 1.1 for THF and acetonitrile. Under the same conditions (25 °C, 1.0 mmol L−1 1, CH2Cl2), 1 polymerizes β-butyrolactone, ε-caprolactone, and δ-valerolactone with rate constants of kobs = 3.0(1) × 10−2, 1.2–2.7 × 10−2, and 0.11(1) min−1, respectively. Homopolymers showed narrow polydispersities of approximately 1.1. Sequential addition polymerizations showed evidence for transesterification if β-butyrolactone or ε-caprolactone is introduced after a lactide block.
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Affiliation(s)
- Todd J.J. Whitehorne
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
| | - Frank Schaper
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
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25
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Lamberti M, Botta A, Mazzeo M. Ring-opening polymerization of cyclic esters by pincer complexes derived from alkaline earth metals. Appl Organomet Chem 2014. [DOI: 10.1002/aoc.3098] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Marina Lamberti
- Department of Chemistry and Biology; University of Salerno; Fisciano I 84084 Salerno Italy
| | - Antonella Botta
- Department of Chemistry and Biology; University of Salerno; Fisciano I 84084 Salerno Italy
| | - Mina Mazzeo
- Department of Chemistry and Biology; University of Salerno; Fisciano I 84084 Salerno Italy
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26
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Ritch JS, Julienne D, Rybchinski SR, Brockman KS, Johnson KRD, Hayes PG. Secondary diphosphine and diphosphido ligands: synthesis, characterisation and group 1 coordination compounds. Dalton Trans 2014; 43:267-76. [PMID: 24104057 DOI: 10.1039/c3dt51844b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two types of secondary diphosphines, 1,8-(ArPH)2C14H8 (1a: Ar = Tripp, 2,4,6-triisopropylphenyl; 1b: Ar = Mes, 2,4,6-trimethylphenyl) and 1,3-((t)BuPHCH2)2C6H4 (2), based on rigid 1,8-anthracene and flexible m-xylyl frameworks, respectively, have been synthesized using different strategies. Compounds 1a and 1b were formed by nucleophilic aromatic substitution of a potassium organophosphido salt onto 1,8-difluoroanthracene, while compound 2 was obtained by addition of the Grignard reagent [1,3-(ClMgCH2)2C6H4]x to a dichloroorganophosphine, followed by reduction to the diphosphine. These compounds were isolated as ca. 1 : 1 mixtures of rac and meso diastereomers as determined by multinuclear NMR spectroscopy. Borane and selenide derivatives of 2, 1,3-((t)BuPH(BH3)CH2)2C6H4 (3) and 1,3-((t)BuPH(Se)CH2)2C6H4 (4), were obtained. Preferential crystallization of one diastereomer of 3 and 4 was observed; X-ray crystallographic studies identified this as the rac isomer for diselenide 4. Metallation studies of compounds 1a and 2 yielded several alkali metal salts. The reaction of KH or K metal with 1a yielded the compounds 1,8-(TrippPK)2C14H8·xTHF (5) and 1,8-(TrippPK)2C14H10·xTHF (6), respectively; in complex 6 the central aromatic ring has been reduced to yield a bent dihydroanthracene backbone. A crown ether derivative of 6, [K(18-crown-6)(THF)2]2[1,8-(TrippP)2C14H10] (7), was characterised crystallographically. Double deprotonation of compound 2 with (n)BuLi/TMEDA (TMEDA = N,N,N',N'-tetramethylethylenediamine) afforded the yellow dilithium complex 1,3-((t)BuPLiCH2)2C6H4·TMEDA (8), which crystallized as a dimer featuring lithium-arene π interactions.
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Affiliation(s)
- Jamie S Ritch
- Department of Chemistry, The University of Winnipeg, 515 Portage Avenue, Winnipeg, MB R3B 2E9, Canada
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27
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Bezpalko MW, Foxman BM, Thomas CM. Noninnocent behavior of bidentate amidophosphido [NP]2- ligands upon coordination to copper. Inorg Chem 2013; 52:12329-31. [PMID: 24143943 DOI: 10.1021/ic402257z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The synthesis and preliminary coordination chemistry of two new redox-active bidentate ligands containing amido and phosphido donors are described. Treatment of the [(R)NP](2-) (R = Ph, 2,4,6-trimethylphenyl) ligands with CuCl2 and PMe3 results in a dimeric copper(I) P-P coupled product via ligand oxidation. The intermediate of this reaction is proposed to involve a ligand radical generated via oxidation of the [(R)NP](2-) ligand by copper(II), and the existence of such an intermediate is probed using computational methods. Significant radical character on the phosphorus atoms of the alleged [(R)NP](•-)/copper(I) intermediate leads to P-P radical coupling.
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Affiliation(s)
- Mark W Bezpalko
- Department of Chemistry, Brandeis University , 415 South Street, Waltham, Massachusetts 02454, United States
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28
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D'Auria I, Lamberti M, Mazzeo M, Milione S, Pellecchia C. Phosphido-diphosphine pincer aluminum complexes as catalysts for ring opening polymerization of cyclic esters. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26969] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ilaria D'Auria
- Department of Chemistry and Biology; University of Salerno. I-84084, Via Giovanni Paolo II; 132, Fisciano I-84084 Salerno Italy
| | - Marina Lamberti
- Department of Chemistry and Biology; University of Salerno. I-84084, Via Giovanni Paolo II; 132, Fisciano I-84084 Salerno Italy
| | - Mina Mazzeo
- Department of Chemistry and Biology; University of Salerno. I-84084, Via Giovanni Paolo II; 132, Fisciano I-84084 Salerno Italy
| | - Stefano Milione
- Department of Chemistry and Biology; University of Salerno. I-84084, Via Giovanni Paolo II; 132, Fisciano I-84084 Salerno Italy
| | - Claudio Pellecchia
- Department of Chemistry and Biology; University of Salerno. I-84084, Via Giovanni Paolo II; 132, Fisciano I-84084 Salerno Italy
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29
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Fang L, Yao Y, Zhang Y, Shen Q, Wang Y. Synthesis and Structure of Lanthanide Aryloxo Complexes and Their Polymerization Behavior for ϵ-Caprolactone. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300218] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Pappalardo D, Bruno M, Lamberti M, Pellecchia C. Ring-Opening Polymerization of Racemic β-Butyrolactone Promoted by Salan- and Salen-Type Yttrium Amido Complexes. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201200737] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Lanthanides and actinides: Annual survey of their organometallic chemistry covering the year 2011. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2012.12.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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32
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Bakewell C, Cao TPA, Le Goff XF, Long NJ, Auffrant A, Williams CK. Yttrium Phosphasalen Initiators for rac-Lactide Polymerization. Organometallics 2013. [DOI: 10.1021/om301129k] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Clare Bakewell
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
| | - Thi-Phuong-Anh Cao
- Laboratoire Heteroelements et
Coordination, CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Xavier F. Le Goff
- Laboratoire Heteroelements et
Coordination, CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France
| | - Nicholas J. Long
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
| | - Audrey Auffrant
- Laboratoire Heteroelements et
Coordination, CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France
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33
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Mazzeo M, Tramontano R, Lamberti M, Pilone A, Milione S, Pellecchia C. Rare earth complexes of phenoxy-thioether ligands: synthesis and reactivity in the ring opening polymerization of cyclic esters. Dalton Trans 2013; 42:9338-51. [DOI: 10.1039/c3dt00066d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Abellán-López A, Chicote MT, Bautista D, Vicente J. From Chelate C,N-Cyclopalladated Oximes to C,N,N′-, C,N,S-, or C,N,C′-Pincer Palladium(II) Complexes by Formation of Oxime Ether Ligands. Organometallics 2012. [DOI: 10.1021/om3007213] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Antonio Abellán-López
- Grupo de Química Organometálica,
Departamento de Química Inorgánica, Universidad de Murcia, Apartado 4021, 30071 Murcia, Spain
| | - María-Teresa Chicote
- Grupo de Química Organometálica,
Departamento de Química Inorgánica, Universidad de Murcia, Apartado 4021, 30071 Murcia, Spain
| | - Delia Bautista
- SAI, Universidad de Murcia, Apartado 4021, 30071 Murcia, Spain
| | - José Vicente
- Grupo de Química Organometálica,
Departamento de Química Inorgánica, Universidad de Murcia, Apartado 4021, 30071 Murcia, Spain
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35
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Gorrasi G, Pappalardo D, Pellecchia C. Polymerization of ε-caprolactone by sodium hydride: From the synthesis of the polymer samples to their thermal, mechanical and barrier properties. REACT FUNCT POLYM 2012. [DOI: 10.1016/j.reactfunctpolym.2012.07.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Biocatalytic synthesis of poly(δ-valerolactone) using a thermophilic esterase from archaeoglobus fulgidus as catalyst. Int J Mol Sci 2012. [PMID: 23202895 PMCID: PMC3497269 DOI: 10.3390/ijms131012232] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
The ring-opening polymerization of δ-valerolactone catalyzed by a thermophilic esterase from the archaeon Archaeoglobus fulgidus was successfully conducted in organic solvents. The effects of enzyme concentration, temperature, reaction time and reaction medium on monomer conversion and product molecular weight were systematically evaluated. Through the optimization of reaction conditions, poly(δ-valerolactone) was produced in 97% monomer conversion, with a number-average molecular weight of 2225 g/mol, in toluene at 70 °C for 72 h. This paper has produced a new biocatalyst for the synthesis of poly(δ-valerolactone), and also deeper insight has been gained into the mechanism of thermophilic esterase-catalyzed ring-opening polymerization.
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37
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Zhang J, Qiu J, Yao Y, Zhang Y, Wang Y, Shen Q. Synthesis and Characterization of Lanthanide Amides Bearing Aminophenoxy Ligands and Their Catalytic Activity for the Polymerization of Lactides. Organometallics 2012. [DOI: 10.1021/om300036a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou, 215123 People’s Republic of China
| | - Jinshui Qiu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou, 215123 People’s Republic of China
| | - Yingming Yao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou, 215123 People’s Republic of China
- The Institute of Low Carbon Economy, Suzhou, 215123 People’s Republic
of China
| | - Yong Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou, 215123 People’s Republic of China
| | - Yaorong Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou, 215123 People’s Republic of China
| | - Qi Shen
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University, Suzhou, 215123 People’s Republic of China
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38
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D'Auria I, Lamberti M, Mazzeo M, Milione S, Roviello G, Pellecchia C. Coordination chemistry and reactivity of zinc complexes supported by a phosphido pincer ligand. Chemistry 2012; 18:2349-60. [PMID: 22267007 DOI: 10.1002/chem.201102414] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Indexed: 11/09/2022]
Abstract
The preparation and characterization of new Zn(II) complexes of the type [(PPP)ZnR] in which R = Et (1) or N(SiMe(3))(2) (2) and PPP is a tridentate monoanionic phosphido ligand (PPP-H = bis(2-diphenylphosphinophenyl)phosphine) are reported. Reaction of ZnEt(2) and Zn[N(SiMe(3))(2)](2) with one equivalent of proligand PPP-H produced the corresponding tetrahedral zinc ethyl (1) and zinc amido (2) complexes in high yield. Homoleptic (PPP)(2) Zn complex 3 was obtained by reaction of the precursors with two equivalents of the proligand. Structural characterization of 1-3 was achieved by multinuclear NMR spectroscopy ((1)H, (13)C, and (31)P) and X-ray crystallography (3). Variable-temperature (1)H and (31)P NMR studies highlighted marked flexibility of the phosphido pincer ligand in coordination at the metal center. A DFT calculation on the compounds provided theoretical support for this behavior. The activities of 1 and 2 toward the ring-opening polymerization of ε-caprolactone and of L- and rac-lactide were investigated, also in combination with an alcohol as external chain-transfer agent. Polyesters with controlled molecular parameters (M(n), end groups) and low polydispersities were obtained. A DFT study on ring-opening polymerization promoted by these complexes highlighted the importance of the coordinative flexibility of the ancillary ligand to promote monomer coordination at the reactive zinc center. Preliminary investigations showed the ability of these complexes to promote copolymerization of L-lactide and ε-caprolactone to achieve random copolymers whose microstructure reproduces the composition of the monomer feed.
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Affiliation(s)
- Ilaria D'Auria
- Department of Chemistry and Biology, University of Salerno via Ponte don Melillo, 84084 Fisciano, Salerno, Italy
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39
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Li G, Lamberti M, Mazzeo M, Pappalardo D, Roviello G, Pellecchia C. Anilidopyridyl-Pyrrolide and Anilidopyridyl-Indolide Group 3 Metal Complexes: Highly Active Initiators for the Ring-Opening Polymerization of rac-Lactide. Organometallics 2012. [DOI: 10.1021/om201251g] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Gang Li
- Dipartimento di Chimica e Biologia, Università di Salerno, I-84084, via Ponte don
Melillo, Fisciano, Salerno, Italy
| | - Marina Lamberti
- Dipartimento di Chimica e Biologia, Università di Salerno, I-84084, via Ponte don
Melillo, Fisciano, Salerno, Italy
| | - Mina Mazzeo
- Dipartimento di Chimica e Biologia, Università di Salerno, I-84084, via Ponte don
Melillo, Fisciano, Salerno, Italy
| | - Daniela Pappalardo
- Dipartimento di Studi Geologici
ed Ambientali, Università del Sannio, via dei Mulini 59/A, 82100, Benevento, Italy
| | - Giuseppina Roviello
- Dipartimento di Tecnologia, Università di Napoli Parthenope, Centro Direzionale
Napoli, Isola C4, 80143, Napoli, Italy
| | - Claudio Pellecchia
- Dipartimento di Chimica e Biologia, Università di Salerno, I-84084, via Ponte don
Melillo, Fisciano, Salerno, Italy
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Liang Z, Ni X, Li X, Shen Z. Synthesis and characterization of benzoxazine-functionalized amine bridged bis(phenolate) lanthanide complexes and their application in the ring-opening polymerization of cyclic esters. Dalton Trans 2012; 41:2812-9. [DOI: 10.1039/c2dt11736c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Pan B, Bezpalko MW, Foxman BM, Thomas CM. Coordination of an N-Heterocyclic Phosphenium Containing Pincer Ligand to a Co(CO)2 Fragment Allows Oxidation To Form an Unusual N-Heterocyclic Phosphinito Species. Organometallics 2011. [DOI: 10.1021/om200816p] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Baofei Pan
- Department of Chemistry, Brandeis University, 415 South Street,
Waltham, Massachusetts 02454, United States
| | - Mark W. Bezpalko
- Department of Chemistry, Brandeis University, 415 South Street,
Waltham, Massachusetts 02454, United States
| | - Bruce M. Foxman
- Department of Chemistry, Brandeis University, 415 South Street,
Waltham, Massachusetts 02454, United States
| | - Christine M. Thomas
- Department of Chemistry, Brandeis University, 415 South Street,
Waltham, Massachusetts 02454, United States
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