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Nizioł E, Marszałek-Harych A, Zierkiewicz W, John Ł, Ejfler J. Structural subtleties and catalytic activity of sodium aminophenolate complexes in polylactide degradation: towards sustainable waste management solutions. Dalton Trans 2024. [PMID: 38814146 DOI: 10.1039/d4dt01270d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
This study explores the intricate coordination chemistry of sodium aminophenolate species and their significant role in the depolymerization of polylactide (PLA), offering novel insights into catalytic degradation processes. By examining sodium coordination entities, including dimers and larger aggregates such as tetramers, we reveal how structural modifications, particularly the manipulation of steric hindrances, influence the formation and stability of these complexes. The dimers, characterized by a unique four-center core (Na-O-Na-O), serve as a foundational motif, which is further elaborated to obtain complexes with varied coordination environments through strategic ligand design. Our research delves into the lability of the amino arm in these complexes, a critical factor that facilitates the coordination of PLA to the sodium center, thereby initiating the depolymerization process. Moreover, DFT studies have been pivotal in identifying the most energetically favorable structures for catalysis, highlighting a distinct preference for an eight-membered ring motif stabilized by intramolecular hydrogen bonds. This motif not only enhances the catalyst's efficiency but also introduces a novel structural paradigm for sodium-based catalysis in PLA degradation. Experimental validation of the theoretical models was achieved through NMR spectroscopy, which confirmed the formation of the active catalyst forms and monitored the progress of PLA degradation. The study presents a comprehensive analysis of the influence of ligand structure on the catalytic activity, underscoring the importance of the eight-membered ring motif. Furthermore, we demonstrate how varying the steric bulk of substituents on the amino arm affects the catalyst's performance, with benzyl-substituted ligands exhibiting superior activity. Our findings offer a profound understanding of the structural factors governing the catalytic efficiency of sodium aminophenolate complexes in PLA degradation. This research not only advances the field of coordination chemistry but also presents a promising avenue for the development of efficient and environmentally friendly catalysts for polymer degradation.
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Affiliation(s)
- Edyta Nizioł
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland.
| | | | - Wiktor Zierkiewicz
- Faculty of Chemistry, Wrocław University of Science and Technology, 27 Wybrzeże Wyspiańskiego, 50-370 Wrocław, Poland
| | - Łukasz John
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland.
| | - Jolanta Ejfler
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland.
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2
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Lee J, Melchakova I, Nayab S, Kim K, Ko YH, Yoon M, Avramov P, Lee H. Synthesis and Characterization of Zinc(II), Cadmium(II), and Palladium(II) Complexes with the Thiophene-Derived Schiff Base Ligand. ACS OMEGA 2023; 8:6016-6029. [PMID: 36816644 PMCID: PMC9933481 DOI: 10.1021/acsomega.2c08001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 01/23/2023] [Indexed: 06/01/2023]
Abstract
Zn(II), Pd(II), and Cd(II) complexes, [L TH MCl 2 ] (M = Zn, Pd; X = Br, Cl) and [L TH Cd(μ-X)X] n (X = Cl, Br; n = n, 2), supported by the (E)-N 1,N 1-dimethyl-N 2-(thiophen-2-ylmethylene)ethane-1,2-diamine (L TH ) ligand are synthesized and structurally characterized. Density functional theory (DFT) electronic structure calculations and variable-temperature NMR support the presence of two conformers and a dynamic interconversion process of the minor conformer to the major one in solution. It is found that the existence of two relevant complex conformers and their respective ratios in solution depend on the central metal ions and counter ions, either Cl- or Br-. Among the two relevant conformers, a single conformer is crystallized and X-ray diffraction analysis revealed a distorted tetrahedral geometry for Zn(II) complexes, and a distorted square planar and square pyramidal geometry for Pd(II) and Cd(II) complexes, respectively. It is shown that [L TH MCl 2 ]/LiO i Pr (M = Zn, Pd) and [L TH Cd(μ-Cl)Cl] n /LiO i Pr can effectively catalyze the ring-opening polymerization (ROP) reaction of rac-lactide (rac-LA) with 94% conversion within 30 s with [L TH ZnCl 2 ]/LiO i Pr at 0 °C. Overall, hetero-enriched poly(lactic acid)s (PLAs) were provided by these catalytic systems with [L TH ZnCl 2 ]/LiO i Pr producing PLA with higher heterotactic bias (P r up to 0.74 at 0 °C).
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Affiliation(s)
- Jaegyeong Lee
- Department
of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Iuliia Melchakova
- Department
of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Saira Nayab
- Department
of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
- Department
of Chemistry, Shaheed Benazir Bhutto University
(SBBU), Sheringal 18050, Upper Dir, Khyber Pakhtunkhwa, Islamic Republic of Pakistan
| | - Kyeonghun Kim
- Department
of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Young Ho Ko
- Center
for Self-Assembly and Complexity (CSC), Institute for Basic Science
(IBS), Pohang University of Science and
Technology (POSTEC), Pohang 37673, Republic
of Korea
| | - Minyoung Yoon
- Department
of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Paul Avramov
- Department
of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Hyosun Lee
- Department
of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
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3
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Effect of initiator on the catalytic performance of zinc(II) complexes supported by aminomethylquinoline and aminomethylpyridine derived ligands in stereoselective ring opening polymerization of rac-lactide. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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4
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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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5
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Roymuhury SK, Mandal M, Chakraborty D, Ramkumar V. Homoleptic titanium and zirconium complexes exhibiting unusual Oiminol–metal coordination: application in stereoselective ring-opening polymerization of lactide. Polym Chem 2021. [DOI: 10.1039/d1py00237f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The synthesis and characterization of novel homoleptic Ti and Zr complexes with tridentate ONO-type Schiff base ligands and their catalytic activities towards the ring-opening polymerization (ROP) of lactide are reported.
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Affiliation(s)
- Sagnik K. Roymuhury
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | - Mrinmay Mandal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801103
- India
| | - Debashis Chakraborty
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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Preparation and Characterization of Self-Assembled Poly(l-Lactide) on the Surface of β-Tricalcium Diphosphate(V) for Bone Tissue Theranostics. NANOMATERIALS 2020; 10:nano10020331. [PMID: 32075235 PMCID: PMC7075192 DOI: 10.3390/nano10020331] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 02/06/2020] [Accepted: 02/11/2020] [Indexed: 01/21/2023]
Abstract
This work was aimed to obtain and characterize the well-defined biocomposites based on β-tricalcium diphosphate(V) (β-TCP) co-doped with Ce3+ and Pr3+ ions modified by poly(l-lactide) (PLLA) with precise tailored chain length and different phosphate to polymer ratio. The composites as well as β-tricalcium diphosphate(V) were spectroscopically characterized using emission spectroscopy and luminescence kinetics. Morphological and structural properties were studied using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The self-assembled poly(l-lactide) in a shape of rose flower has been successfully polymerized on the surface of the β-tricalcium diphosphate(V) nanocrystals. The studied materials were evaluated in vitro including cytotoxicity (MTT assay) and hemolysis tests. The obtained results suggested that the studied materials may find potential application in tissue engineering.
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7
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Chen XL, Wang B, Pan L, Li YS. Homoleptic, bis-ligated magnesium complexes for ring-opening polymerization of lactide and lactones: Synthesis, structure, polymerization behavior and mechanism studies. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4770] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Xiao-Lu Chen
- Tianjin Key Lab of Composite and Functional Materials, School of Materials Science and Engineering; Tianjin University; Tianjin 300072 China
| | - Bin Wang
- Tianjin Key Lab of Composite and Functional Materials, School of Materials Science and Engineering; Tianjin University; Tianjin 300072 China
| | - Li Pan
- Tianjin Key Lab of Composite and Functional Materials, School of Materials Science and Engineering; Tianjin University; Tianjin 300072 China
| | - Yue-Sheng Li
- Tianjin Key Lab of Composite and Functional Materials, School of Materials Science and Engineering; Tianjin University; Tianjin 300072 China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin 300072 China
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8
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Ham JH, Cho J, Nayab S, Jeong JH. Synthesis and structural characterisation of copper complexes containing methylthiophene and methylfuryl derivatives of (R,R)-1,2-diaminocyclohexane as precatalysts for polymerisation of rac-lactide. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.04.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Jędrzkiewicz D, Marszałek-Harych A, Ejfler J. Serendipitous Synthesis Found in the Nuances of Homoleptic Zinc Complex Formation. Inorg Chem 2018; 57:8169-8180. [DOI: 10.1021/acs.inorgchem.8b00550] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Dawid Jędrzkiewicz
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | | | - Jolanta Ejfler
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
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11
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Marszałek-Harych A, Jędrzkiewicz D, Ejfler J. Bio- and chemocatalysis cascades as a bridge between biology and chemistry for green polymer synthesis. Cell Mol Biol Lett 2017; 22:28. [PMID: 29225630 PMCID: PMC5715637 DOI: 10.1186/s11658-017-0061-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 11/23/2017] [Indexed: 02/08/2023] Open
Abstract
The development and integration of bio- and chemocatalytic processes to convert renewable or biomass feedstocks into polymers is a vibrant field of research with enormous potential for environmental protection and the mitigation of global warming. Here, we review the biotechnological and chemical synthetic strategies for producing platform monomers from bio-based sources and transforming them into eco-polymers. We also discuss their advanced bio-application using the example of polylactide (PLA), the most valuable green polymer on the market.
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Affiliation(s)
| | - Dawid Jędrzkiewicz
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Jolanta Ejfler
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
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12
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D'Auria I, Tedesco C, Mazzeo M, Pellecchia C. New homoleptic bis(pyrrolylpyridiylimino) Mg(ii) and Zn(ii) complexes as catalysts for the ring opening polymerization of cyclic esters via an "activated monomer" mechanism. Dalton Trans 2017; 46:12217-12225. [PMID: 28875186 DOI: 10.1039/c7dt02445b] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of MgBu2 and ZnEt2 or Zn{N[Si(CH3)3]2}2 with a tridentate monoanionic pyrrolylpyridiylimino [N-,N,N] proligand gave homoleptic species, as exclusive products, in high yields. The complexes were characterized in solution by 1D and 2D NMR analysis and by single crystal X-ray crystallography. The new homoleptic complexes were tested as initiators in the polymerization of ε-caprolactone and lactide in the presence of an exogenous alcohol. For both complexes, the polymerizations proceed via an "activated monomer" mechanism that, in the case of the magnesium complex, was correlated with the coordinative flexibility of the ligands, resulting in extremely high productivities under mild conditions.
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Affiliation(s)
- Ilaria D'Auria
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno, via Giovanni Paolo II 132 - 84084, Fisciano, SA, Italy. and Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), via Celso Ulpiani 27 - 70126, Bari, Italy
| | - Consiglia Tedesco
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno, via Giovanni Paolo II 132 - 84084, Fisciano, SA, Italy.
| | - Mina Mazzeo
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno, via Giovanni Paolo II 132 - 84084, Fisciano, SA, Italy. and Consorzio Interuniversitario Reattività Chimica e 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. and Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), via Celso Ulpiani 27 - 70126, Bari, Italy
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13
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Kwon KS, Nayab S, Jeong JH. Synthesis, characterisation and X-ray structure of Cu(II) and Zn(II) complexes bearing N , N -dimethylethylenamine-camphorylimine ligands: Application in the polymerisation of rac -lactide. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.061] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Jędrzkiewicz D, Kantorska D, Wojtaszak J, Ejfler J, Szafert S. DFT calculations as a ligand toolbox for the synthesis of active initiators for ROP of cyclic esters. Dalton Trans 2017; 46:4929-4942. [PMID: 28332684 DOI: 10.1039/c7dt00394c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New heteroleptic zinc dimeric complexes bearing an aminophenolate ligand of a single-site initiator framework were synthesized and characterized by spectroscopic methods, X-ray analysis, and DFT calculations. The theoretical study, verified by the experimental data, explains the catalytic behaviour in the ROP of lactide in the examined zinc complexes. The presented simple DFT protocol constitutes a valuable method for the qualification of the ancillary ligand to rationally design new complexes to improve their catalytic activity.
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Affiliation(s)
- D Jędrzkiewicz
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland.
| | - D Kantorska
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland.
| | - J Wojtaszak
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland.
| | - J Ejfler
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland.
| | - S Szafert
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland.
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15
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Jędrzkiewicz D, Adamus G, Kwiecień M, John Ł, Ejfler J. Lactide as the Playmaker of the ROP Game: Theoretical and Experimental Investigation of Ring-Opening Polymerization of Lactide Initiated by Aminonaphtholate Zinc Complexes. Inorg Chem 2017; 56:1349-1365. [DOI: 10.1021/acs.inorgchem.6b02439] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dawid Jędrzkiewicz
- Faculty of Chemistry, University of Wroclaw, Fryderyka Joliot-Curie 14, 50-383 Wroclaw, Poland
| | - Grażyna Adamus
- Centre of Polymer and Carbon Materials Polish Academy of Science, Marii Curie-Skłodowskiej 34, 41-819 Zabrze, Poland
| | - Michał Kwiecień
- Centre of Polymer and Carbon Materials Polish Academy of Science, Marii Curie-Skłodowskiej 34, 41-819 Zabrze, Poland
| | - Łukasz John
- Faculty of Chemistry, University of Wroclaw, Fryderyka Joliot-Curie 14, 50-383 Wroclaw, Poland
| | - Jolanta Ejfler
- Faculty of Chemistry, University of Wroclaw, Fryderyka Joliot-Curie 14, 50-383 Wroclaw, Poland
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16
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Routaray A, Mantri S, Nath N, Sutar AK, Maharana T. Polymerization of lactide and synthesis of block copolymer catalyzed by copper (II) Schiff base complex. CHINESE CHEM LETT 2016. [DOI: 10.1016/j.cclet.2016.06.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Nifant'ev IE, Shlyakhtin AV, Tavtorkin AN, Ivchenko PV, Borisov RS, Churakov AV. Monomeric and dimeric magnesium mono-BHT complexes as effective ROP catalysts. CATAL COMMUN 2016. [DOI: 10.1016/j.catcom.2016.09.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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18
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Routaray A, Mantri S, Nath N, Sutar AK, Maharana T. Nickel(II) complex catalyzed ring-opening polymerization of lactide. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.08.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Copolymer of lactide and ε-caprolactone catalyzed by bimetallic Schiff base aluminum complexes. Sci China Chem 2016. [DOI: 10.1007/s11426-016-0118-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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20
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Mantri S, Routaray A, Nath N, Sutar AK, Maharana T. Synthesis, characterization and catalytic activity of zinc complex for ring-opening polymerization of lactide. POLYM INT 2016. [DOI: 10.1002/pi.5268] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Somanath Mantri
- Catalysis Research Laboratory, Department of Chemistry; Ravenshaw University; Cuttack-3 Odisha India
| | - Anita Routaray
- Catalysis Research Laboratory, Department of Chemistry; Ravenshaw University; Cuttack-3 Odisha India
| | - Nibedita Nath
- Catalysis Research Laboratory, Department of Chemistry; Ravenshaw University; Cuttack-3 Odisha India
| | - Alekha Kumar Sutar
- Catalysis Research Laboratory, Department of Chemistry; Ravenshaw University; Cuttack-3 Odisha India
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21
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Ebrahimi T, Mamleeva E, Yu I, Hatzikiriakos SG, Mehrkhodavandi P. The Role of Nitrogen Donors in Zinc Catalysts for Lactide Ring-Opening Polymerization. Inorg Chem 2016; 55:9445-53. [PMID: 27580374 DOI: 10.1021/acs.inorgchem.6b01722] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The electronic effects of nitrogen donors in zinc catalysts for ring-opening polymerization of cyclic esters were investigated. Alkyl and benzyloxy zinc complexes supported by tridentate diamino- and aminoimino phenolate ligands were synthesized, and their solid-state and solution structures characterized. The solution-state structures showed that the alkyl complexes are mononuclear, while the alkoxy complexes are dimeric with the ligands coordinated with different denticities depending on the nature of the ligand donors. The catalytic activities of these compounds toward the ring-opening polymerization of racemic lactide were studied and showed that catalysts with secondary and imine nitrogen donors are more active than analogues with tertiary amines.
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Affiliation(s)
- Tannaz Ebrahimi
- Department of Chemistry, and ‡Department of Chemical and Biological Engineering, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Emiliya Mamleeva
- Department of Chemistry, and ‡Department of Chemical and Biological Engineering, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Insun Yu
- Department of Chemistry, and ‡Department of Chemical and Biological Engineering, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Savvas G Hatzikiriakos
- Department of Chemistry, and ‡Department of Chemical and Biological Engineering, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, and ‡Department of Chemical and Biological Engineering, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
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22
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Salicylaldimine Copper(II) complex catalyst: Pioneer for ring opening Polymerization of Lactide. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1091-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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23
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Peng KF, Chen Y, Chen CT. Synthesis and catalytic application of magnesium complexes bearing pendant indolyl ligands. Dalton Trans 2016; 44:9610-9. [PMID: 25923231 DOI: 10.1039/c5dt01173f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three novel indole-based ligand precursors [HIndPh(R), R = methoxy, HIndPh(OMe) (); thiomethoxy, HIndPh(SMe) (); and N,N'-dimethylamino, HIndPh(NMe2) ()] have been synthesized via Sonogashira and cyclization reactions with moderate to high yield. Reactions of these ligand precursors with 0.6 equivalent of Mg(n)Bu2 in THF afforded the magnesium bis-indolyl complexes , respectively. All the ligand precursors and related magnesium complexes have been characterized by NMR spectroscopy and elemental analyses. The molecular structures are reported for compounds and . Under optimized conditions, compound demonstrates efficient catalytic activities towards the ring opening polymerization of l-lactide and ε-caprolactone in the presence of BnOH.
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Affiliation(s)
- Kuo-Fu Peng
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.
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Gallegos C, Tabernero V, Mosquera MEG, Cuenca T, Cano J. Comparative Study of Lactide Polymerization with Lithium, Sodium, Potassium, Magnesium, Calcium, and Zinc Azonaphthoxide Complexes. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500818] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Magnesium complexes of the N, O polydentate scaffold: Synthesis, structural characterization and polymerization studies. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.06.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Synthesis and structural studies of copper(II) complex supported by –ONNO– tetradentate ligand: Efficient catalyst for the ring-opening polymerization of lactide. CHINESE JOURNAL OF CATALYSIS 2015. [DOI: 10.1016/s1872-2067(14)60293-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Synthesis and characterization of zinc complexes supported by NHC-based CNN- and CNP-tridentate ligands and their catalysis in the ring-opening polymerization of rac-lactide and ε-caprolactone. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.02.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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28
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Ghosh S, Gowda RR, Jagan R, Chakraborty D. Gallium and indium complexes containing the bis(imino)phenoxide ligand: synthesis, structural characterization and polymerization studies. Dalton Trans 2015; 44:10410-22. [DOI: 10.1039/c5dt00811e] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A series of gallium and indium complexes containing the bis(imino)phenolate ligand framework were synthesized and completely characterized with different spectroscopic techniques.
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Affiliation(s)
- Swarup Ghosh
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
| | - Ravikumar R. Gowda
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
| | - Rajamony Jagan
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600 036
- India
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Jędrzkiewicz D, Ejfler J, Gulia N, John Ł, Szafert S. Designing ancillary ligands for heteroleptic/homoleptic zinc complex formation: synthesis, structures and application in ROP of lactides. Dalton Trans 2015; 44:13700-15. [DOI: 10.1039/c5dt01553g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis and characterization of a series of new amino-phenol/naphthol ligands (L1,2-H) have been developed and their respective zinc complexes (1 and 2-Zn) have been synthesized.
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Affiliation(s)
- D. Jędrzkiewicz
- Department of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | - J. Ejfler
- Department of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | - N. Gulia
- Department of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | - Ł. John
- Department of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | - S. Szafert
- Department of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
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30
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Gao A, Yao W, Xiao Y, Zhang M, Zhu G, Zhang N, Wang S, Wang D, Zhang Y, Gao Y, Xu Z, Lu P, Zhang Z. Dinuclear zinc complexes with chiral tetra-azane ligands: Synthesis, structures and catalytic properties for ring-opening polymerization of cyclic esters. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.08.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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31
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Zhang M, Ni X, Shen Z. Synthesis of Bimetallic Bis(phenolate) N-Heterocyclic Carbene Lanthanide Complexes and Their Applications in the Ring-Opening Polymerization of l-Lactide. Organometallics 2014. [DOI: 10.1021/om500930m] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Min Zhang
- MOE Key Laboratory of Macromolecular
Synthesis and Functionalization, Department of Polymer Science and
Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Xufeng Ni
- MOE Key Laboratory of Macromolecular
Synthesis and Functionalization, Department of Polymer Science and
Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Zhiquan Shen
- MOE Key Laboratory of Macromolecular
Synthesis and Functionalization, Department of Polymer Science and
Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
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32
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Gerling KA, Rezayee NM, Rheingold AL, Green DB, Fritsch JM. Synthesis and structures of bis-ligated zinc complexes supported by tridentate ketoimines that initiate L-lactide polymerization. Dalton Trans 2014; 43:16498-508. [PMID: 25256407 DOI: 10.1039/c4dt01607f] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Eight bis-ligated, homoleptic, zinc complexes were synthesized through the reaction of NNO Schiff base ketoimines bearing varying substituents with diethyl zinc in an inert atmosphere glovebox at room temperature and isolated in 62-95% yield. The complexes were characterized with (1)H, (13)C, and (19)F nuclear magnetic resonance spectroscopy, absorbance spectroscopy, high resolution mass spectrometry, elemental analysis, and single crystal X-ray crystallography. The complexes were shown to adopt distorted octahedral coordination geometry around zinc. The (1)H and (19)F NMR spectra of complexes 1-7 showed stable zinc coordination at 300 K while the effect of steric encumbrance and two trifluoromethyl groups in complex 8 was investigated with variable temperature NMR. The bis-ligated zinc complexes were effective initiators for the ring opening polymerization of L-lactide into poly-L-lactic acid (PLLA). With [L-lac]/[Zn complex] = 50, the bis-ligated zinc complexes yielded percentage conversion of 14-98% with polymerization times varying from 15-1440 min, where the longest reaction times were required when two trifluoromethyl groups were present. The addition of 4-fluorophenol co-catalyst resulted in up to a 5-fold increase in the percentage conversion in toluene solution and up to a 14-fold increase in bulk melt polymerization with reductions in the poly-dispersity index values for the isolated PLLA. Addition of 4-fluorophenol to complex 1 was studied with (1)H and (19)F NMR and appeared to yield an in situ generated zinc alkoxide complex.
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Affiliation(s)
- Kimberly A Gerling
- Department of Chemistry, Pepperdine University, 24255 Pacific Coast Highway, Malibu, CA 90263, USA.
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