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Chen Y, Li B, Wang Y, Zhu X, Yuan D, Yao Y. Synthesis of Mono- and Dinuclear Aluminum Complexes Bearing Aromatic Amino-Phenolato Ligands: A Comparative Study in the Ring-Opening Polymerization of Cyclohexene Oxide. Inorg Chem 2023; 62:21247-21256. [PMID: 38053396 DOI: 10.1021/acs.inorgchem.3c03318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Dinuclear aluminum methyl complexes bearing aromatic diamine-bridged tetra(phenolato) ligands and the mononuclear aluminum methyl complex with the phenylamine-bridged bis(phenolato) ligand have been synthesized and characterized. Structure determination revealed that the Al-Al distances in these dinuclear aluminum complexes are tunable by the choice of the suitable aromatic backbone of the diamine-bridged tetra(phenolato) ligands. The catalytic behaviors of these mono- and dinuclear aluminum complexes for cyclohexene oxide (CHO) polymerization were investigated. The activities of these dinuclear Al complexes were observed to increase with the decrease of Al-Al distances, and the dinuclear Al complexes appeared to have better catalytic activity than the mononuclear Al complex, even if the Al-Al distance is as long as 9.401 Å. Dinuclear aluminum complex 2, with the shortest Al-Al distance (7.236 Å), showed the highest activity toward CHO polymerization with TOFs up to 6460 h-1 in neat CHO at 30 °C. Furthermore, comparative kinetic studies revealed that the polymerization is first-order for CHO concentration, and the reaction orders for initiator concentration are different for the mono- and dinuclear Al complexes. The polymerization mechanism study revealed that both the methyl and phenolate groups were involved in the initiation process.
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Affiliation(s)
- Yongjie Chen
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
| | - Baoxia Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and 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 and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
| | - Xuehua Zhu
- School of Chemistry and Life Science, Suzhou University of Science and Technology, Suzhou 215009, People's Republic of China
| | - Dan Yuan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and 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 and Materials Science, Dushu Lake Campus, Soochow University, Suzhou 215123, People's Republic of China
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2
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Zhao T, Wang P, Liu N, Zhao W, Yang M, Li S, Yang Z, Sun B, Huhn T. Synthesis and X-ray structure analysis of cytotoxic heptacoordinated Salan hafnium (IV) complexes stabilized with 2,6-dipicolinic acid. J Inorg Biochem 2023; 240:112094. [PMID: 36525714 DOI: 10.1016/j.jinorgbio.2022.112094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 11/13/2022] [Accepted: 12/04/2022] [Indexed: 12/13/2022]
Abstract
Four novel Salan Hf(IV) complexes stabilized by 2,6-dipicolinic acid (Dipic) were synthesized and characterized by 1H, 13C NMR and X-ray diffraction spectroscopy. These Hf(IV)bis-chelates could be obtained in good to excellent yields (88%-91%) and demonstrated rather good stability in aqueous media and on silica gel. [L2Hf(IV)Dipic4-H,Cl] containing steric bulk L2 were stable in about 10% H2O (H2O/THF (v/v)), however, [L1Hf(IV)Dipic4-H,Cl] with non-steric L1 could slowly dissociate and release nontoxic L1. [L1-2Hf(IV)Dipic4-Cl] showed excellent anti-tumoral activity in the range of cisplatin (Hela S3: IC50 = 3.5 ± 0.4 μM, Hep G2: IC50 = 11.2 ± 2.1 μM). In addition, the cellular uptake and apoptosis investigation of [L1Hf(IV)Dipic4-Cl] suggested a fast cellular uptake process against Hela S3 cells with an almost exclusive induced apoptosis cell death path.
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Affiliation(s)
- Tiankun Zhao
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
| | - Peng Wang
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Nan Liu
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Wenzhuo Zhao
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Mingjun Yang
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Shanjia Li
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Zhongduo Yang
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Bolu Sun
- College of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Thomas Huhn
- Fachbereich Chemie and Konstanz Research School Chemical Biology, Universität Konstanz, Universitätsstr. 10, D-78457 Konstanz, Germany
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3
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Yue YN, Zhang T, La YT, Dong WK. AN EXPLORATION OF STRUCTURALLY CHARACTERIZED HETERO-TRINUCLEAR [Cu(II)2Ca(II)] FLEXIBLE-BIS(SALAMO)-TYPE COMPLEX. J STRUCT CHEM+ 2022. [DOI: 10.1134/s0022476622060026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Earth-abundant bimetallic and multimetallic catalysts for Epoxide/CO2 ring-opening copolymerization. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132433] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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5
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Adam MSS, Abdel-Rahman LH, Ahmed HES, Makhlouf M, Alhasani M, El-Metwaly NM. Enhanced catalytic (ep)oxidation of olefins by VO(II), ZrO(II) and Zn(II)-imine complexes; extensive characterization supported by DFT studies. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130295] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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6
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Balla E, Daniilidis V, Karlioti G, Kalamas T, Stefanidou M, Bikiaris ND, Vlachopoulos A, Koumentakou I, Bikiaris DN. Poly(lactic Acid): A Versatile Biobased Polymer for the Future with Multifunctional Properties-From Monomer Synthesis, Polymerization Techniques and Molecular Weight Increase to PLA Applications. Polymers (Basel) 2021; 13:1822. [PMID: 34072917 PMCID: PMC8198026 DOI: 10.3390/polym13111822] [Citation(s) in RCA: 129] [Impact Index Per Article: 43.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/13/2021] [Accepted: 05/27/2021] [Indexed: 12/11/2022] Open
Abstract
Environmental problems, such as global warming and plastic pollution have forced researchers to investigate alternatives for conventional plastics. Poly(lactic acid) (PLA), one of the well-known eco-friendly biodegradables and biobased polyesters, has been studied extensively and is considered to be a promising substitute to petroleum-based polymers. This review gives an inclusive overview of the current research of lactic acid and lactide dimer techniques along with the production of PLA from its monomers. Melt polycondensation as well as ring opening polymerization techniques are discussed, and the effect of various catalysts and polymerization conditions is thoroughly presented. Reaction mechanisms are also reviewed. However, due to the competitive decomposition reactions, in the most cases low or medium molecular weight (MW) of PLA, not exceeding 20,000-50,000 g/mol, are prepared. For this reason, additional procedures such as solid state polycondensation (SSP) and chain extension (CE) reaching MW ranging from 80,000 up to 250,000 g/mol are extensively investigated here. Lastly, numerous practical applications of PLA in various fields of industry, technical challenges and limitations of PLA use as well as its future perspectives are also reported in this review.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Dimitrios N. Bikiaris
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece; (E.B.); (V.D.); (G.K.); (T.K.); (M.S.); (N.D.B.); (A.V.); (I.K.)
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7
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Polymetallic Group 4 Complexes: Catalysts for the Ring Opening Polymerisation of rac-Lactide. Catalysts 2021. [DOI: 10.3390/catal11050551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Five novel air- and moisture-stable polymetallic Ti and Zr amino acid-derived amine bis(phenolate) (ABP) complexes were synthesised and fully characterised, including X-ray crystallographic studies. The reaction of the ABP proligands with Ti or Zr alkoxides has resulted in the formation of polymetallic aggregates of different nuclearity. The steric bulk on the pendant arm of the ligand was found to play a critical role in establishing the nuclearity of the aggregated complex. Sterically, less-demanding groups, such as H or Me, facilitated the formation of tetrametallic Ti clusters, bridged by carboxylate groups, while increased steric bulk (tBu) led to the formation of binuclear μ-oxo-bridged species. The isolated complexes were employed as catalysts for the ring opening polymerisation (ROP) of rac-lactide. Overall, the Ti catalysts were all active with the smaller, bimetallic Ti aggregates exhibiting relatively faster rates. A monometallic, bis(ABP) Zr complex was found to exert remarkable ROP activity, albeit with limited control over the tacticity and molecular weight distribution of the polymer. A further oxo-bridged Zr cluster was shown to display a previously unprecedented trimetallic structure and achieved a moderate rate in the ROP of rac-lactide.
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Wu YH, Ye L, Sun YN, Han WJ, Zhao T. Synthesis and Pyrolysis of Soluble Cyclic Hf-Schiff Base Polymers. CHINESE JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1007/s10118-021-2566-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Co2O3 and MnO2 as inexpensive catalysts for the ring-opening polymerization of cyclic esters. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-020-02381-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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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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11
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Mrinmay Mandal, Debashis Chakraborty. Zirconium and Hafnium Complexes Bearing Salen Ligands for the Polymerization of Ethylene. POLYMER SCIENCE SERIES B 2020. [DOI: 10.1134/s1560090420060068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Suresh L, Lalrempuia R, B. Ekeli J, Gillis-D’Hamers F, Törnroos KW, Jensen VR, Le Roux E. Unsaturated and Benzannulated N-Heterocyclic Carbene Complexes of Titanium and Hafnium: Impact on Catalysts Structure and Performance in Copolymerization of Cyclohexene Oxide with CO 2. Molecules 2020; 25:E4364. [PMID: 32977466 PMCID: PMC7582562 DOI: 10.3390/molecules25194364] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 01/13/2023] Open
Abstract
Tridentate, bis-phenolate N-heterocyclic carbenes (NHCs) are among the ligands giving the most selective and active group 4-based catalysts for the copolymerization of cyclohexene oxide (CHO) with CO2. In particular, ligands based on imidazolidin-2-ylidene (saturated NHC) moieties have given catalysts which exclusively form polycarbonate in moderate-to-high yields even under low CO2 pressure and at low copolymerization temperatures. Here, to evaluate the influence of the NHC moiety on the molecular structure of the catalyst and its performance in copolymerization, we extend this chemistry by synthesizing and characterizing titanium complexes bearing tridentate bis-phenolate imidazol-2-ylidene (unsaturated NHC) and benzimidazol-2-ylidene (benzannulated NHC) ligands. The electronic properties of the ligands and the nature of their bonds to titanium are studied using density functional theory (DFT) and natural bond orbital (NBO) analysis. The metal-NHC bond distances and bond strengths are governed by ligand-to-metal σ- and π-donation, whereas back-donation directly from the metal to the NHC ligand seems to be less important. The NHC π-acceptor orbitals are still involved in bonding, as they interact with THF and isopropoxide oxygen lone-pair donor orbitals. The new complexes are, when combined with [PPN]Cl co-catalyst, selective in polycarbonate formation. The highest activity, albeit lower than that of the previously reported Ti catalysts based on saturated NHC, was obtained with the benzannulated NHC-Ti catalyst. Attempts to synthesize unsaturated and benzannulated NHC analogues based on Hf invariably led, as in earlier work with Zr, to a mixture of products that include zwitterionic and homoleptic complexes. However, the benzannulated NHC-Hf complexes were obtained as the major products, allowing for isolation. Although these complexes selectively form polycarbonate, their catalytic performance is inferior to that of analogues based on saturated NHC.
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Affiliation(s)
- Lakshmi Suresh
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway; (L.S.); (R.L.); (J.B.E.); (F.G.-D.); (K.W.T.)
| | - Ralte Lalrempuia
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway; (L.S.); (R.L.); (J.B.E.); (F.G.-D.); (K.W.T.)
- School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
| | - Jonas B. Ekeli
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway; (L.S.); (R.L.); (J.B.E.); (F.G.-D.); (K.W.T.)
| | - Francis Gillis-D’Hamers
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway; (L.S.); (R.L.); (J.B.E.); (F.G.-D.); (K.W.T.)
| | - Karl W. Törnroos
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway; (L.S.); (R.L.); (J.B.E.); (F.G.-D.); (K.W.T.)
| | - Vidar R. Jensen
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway; (L.S.); (R.L.); (J.B.E.); (F.G.-D.); (K.W.T.)
| | - Erwan Le Roux
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway; (L.S.); (R.L.); (J.B.E.); (F.G.-D.); (K.W.T.)
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13
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Fernández-Baeza J, Sánchez-Barba LF, Lara-Sánchez A, Sobrino S, Martínez-Ferrer J, Garcés A, Navarro M, Rodríguez AM. NNC-Scorpionate Zirconium-Based Bicomponent Systems for the Efficient CO 2 Fixation into a Variety of Cyclic Carbonates. Inorg Chem 2020; 59:12422-12430. [PMID: 32811145 DOI: 10.1021/acs.inorgchem.0c01532] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two new derivatives of the bis(3,5-dimethylpyrazol-1-yl)methane modified by introduction of organosilyl groups on the central carbon atom, one of which bearing a chiral fragment, have been easily prepared. We verified the potential utility of these compounds through the reaction with [Zr(NMe2)4] for the preparation of novel zirconium complexes in which an ancillary bis(pyrazol-1-yl)methanide acts as a robust monoanionic tridentate scorpionate in a κ3-NNC chelating mode, forming strained four-membered heterometallacycles. These κ3-NNC-scorpionate zirconium amides were investigated as catalysts in combination with tetra-n-butylammonium bromide as cocatalyst for CO2 fixation into five-membered cyclic carbonate products. The study has led to the development of an efficient zirconium-based bicomponent system for the selective cycloaddition reaction of CO2 with epoxides. Kinetics investigations confirmed apparent first-order dependence on the catalyst and cocatalyst concentrations. In addition, this system displays very broad substrate scope, including mono- and disubstituted substrates, as well as the challenging biorenewable terpene derived limonene oxide, under mild and solvent-free conditions.
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Affiliation(s)
- Juan Fernández-Baeza
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
| | - Luis F Sánchez-Barba
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Agustín Lara-Sánchez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
| | - Sonia Sobrino
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
| | - Jaime Martínez-Ferrer
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
| | - Andrés Garcés
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Marta Navarro
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles-28933-Madrid, Spain
| | - Ana M Rodríguez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
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Khononov M, Liu H, Fridman N, Tamm M, Eisen MS. Benzimidazolin-2-iminato Hafnium Complexes: Synthesis, Characterization, and Catalytic Addition of Alcohols to Carbodiimides. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00384] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Maxim Khononov
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Heng Liu
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Moris S. Eisen
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
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15
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Deng J, Ratanasak M, Sako Y, Tokuda H, Maeda C, Hasegawa JY, Nozaki K, Ema T. Aluminum porphyrins with quaternary ammonium halides as catalysts for copolymerization of cyclohexene oxide and CO 2: metal-ligand cooperative catalysis. Chem Sci 2020; 11:5669-5675. [PMID: 32864082 PMCID: PMC7425082 DOI: 10.1039/d0sc01609h] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 05/16/2020] [Indexed: 12/24/2022] Open
Abstract
Bifunctional Al porphyrins worked as excellent catalysts for the copolymerization of cyclohexene oxide (CHO) and CO2.
Bifunctional AlIII porphyrins with quaternary ammonium halides, 2-Cl and 2-Br, worked as excellent catalysts for the copolymerization of cyclohexene oxide (CHO) and CO2 at 120 °C. Turnover frequency (TOF) and turnover number (TON) reached 10 000 h–1 and 55 000, respectively, and poly(cyclohexene carbonate) (PCHC) with molecular weight of up to 281 000 was obtained with a catalyst loading of 0.001 mol%. In contrast, bifunctional MgII and ZnII counterparts, 3-Cl and 4-Cl, as well as a binary catalyst system, 1-Cl with bis(triphenylphosphine)iminium chloride (PPNCl), showed poor catalytic performances. Kinetic studies revealed that the reaction rate was first-order in [CHO] and [2-Br] and zero-order in [CO2], and the activation parameters were determined: ΔH‡ = 12.4 kcal mol–1, ΔS‡ = –26.1 cal mol–1 K–1, and ΔG‡ = 21.6 kcal mol–1 at 80 °C. Comparative DFT calculations on two model catalysts, AlIII complex 2′ and MgII complex 3′, allowed us to extract key factors in the catalytic behavior of the bifunctional AlIII catalyst. The high polymerization activity and carbonate-linkage selectivity originate from the cooperative actions of the metal center and the quaternary ammonium cation, both of which facilitate the epoxide-ring opening by the carbonate anion to form the carbonate linkage in the key transition state such as TS3b (ΔH‡ = 13.3 kcal mol–1, ΔS‡ = –3.1 cal mol–1 K–1, and ΔG‡ = 14.4 kcal mol–1 at 80 °C).
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Affiliation(s)
- Jingyuan Deng
- Department of Chemistry and Biotechnology , Graduate School of Engineering , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Manussada Ratanasak
- Institute for Catalysis , Hokkaido University , Kita 21, Nishi 10, Kita-ku, Sapporo , Hokkaido 001-0021 , Japan .
| | - Yuma Sako
- Division of Applied Chemistry , Graduate School of Natural Science and Technology , Okayama University , Tsushima , Okayama 700-8530 , Japan .
| | - Hideki Tokuda
- Division of Applied Chemistry , Graduate School of Natural Science and Technology , Okayama University , Tsushima , Okayama 700-8530 , Japan .
| | - Chihiro Maeda
- Division of Applied Chemistry , Graduate School of Natural Science and Technology , Okayama University , Tsushima , Okayama 700-8530 , Japan .
| | - Jun-Ya Hasegawa
- Institute for Catalysis , Hokkaido University , Kita 21, Nishi 10, Kita-ku, Sapporo , Hokkaido 001-0021 , Japan .
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology , Graduate School of Engineering , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan .
| | - Tadashi Ema
- Division of Applied Chemistry , Graduate School of Natural Science and Technology , Okayama University , Tsushima , Okayama 700-8530 , Japan .
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16
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Mandal M. Group 4 complexes as catalysts for the transformation of CO2 into polycarbonates and cyclic carbonates. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2019.121067] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Hao Y, Tian T, Kang Y, Chang T, Fu X, Zhu Z, Meng X, Panchal B, Qin S. Potassium iodide and bis(pyridylcarbamate) electrostatic synergy in the fixation reaction of CO 2 and epoxides. NEW J CHEM 2020. [DOI: 10.1039/d0nj02597f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The synergistic interaction of KI and bis(pyridylcarbamate) plays an important role in the fixation reaction of CO2 and epoxides.
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Affiliation(s)
- Yongjing Hao
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Tian Tian
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Yanhui Kang
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Tao Chang
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Xiying Fu
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Zheng Zhu
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Xiaocai Meng
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Balaji Panchal
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
| | - Shenjun Qin
- Key Laboratory of Utilization of CO2 of Handan City
- College of Material Science and Engineering
- Hebei University of Engineering
- Handan 056038
- China
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Normand AT, Malacea-Kabbara R, Lapenta R, Dajnak A, Richard P, Cattey H, Bolley A, Grassi A, Milione S, Auffrant A, Dagorne S, Le Gendre P. Phosphasalen group IV metal complexes: synthesis, characterization and ring opening polymerization of lactide. Dalton Trans 2020; 49:6989-7004. [DOI: 10.1039/d0dt00972e] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of discrete mononuclear neutral and cationic phosphasalen Ti and Zr complexes has been isolated and characterized. For the first time, a cationic group IV metal complex was found active in the ROP of LA.
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