1
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Camphor: Synthesis, reactions and uses as a potential moiety in the development of complexes and organocatalysts. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Choe S, Lee H, Nayab S. Diverse coordination geometry of cobalt (II), zinc (II), and cadmium (II) complexes comprising
N
,
N
‐bis(1H‐pyrazol‐1‐yl)methyl)amines derivatives: Synthesis, structures, and ring opening polymerization of
rac
‐lactide. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6204] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Solhye Choe
- Department of Chemistry and Green‐Nano Materials Research Center Kyungpook National University Daegu South Korea
| | - Hyosun Lee
- Department of Chemistry and Green‐Nano Materials Research Center Kyungpook National University Daegu South Korea
| | - Saira Nayab
- Department of Chemistry Shaheed Benazir Bhutto University Sheringal Dir (U) Pakistan
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3
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Choe S, Lee H, Nayab S. Synthesis, structures, and catalytic efficiency in ring opening polymerization of rac-lactide with tridentate vs. bidentate cobalt( ii), zinc( ii), and cadmium( ii) complexes containing N-substituted N, N-bis((3,5-dimethyl-1 H-pyrazol-1-yl)methyl)amine ligands. RSC Adv 2021; 11:18840-18851. [PMID: 35478641 PMCID: PMC9033469 DOI: 10.1039/d1ra02365a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/20/2021] [Indexed: 01/09/2023] Open
Abstract
A series of Co(ii), Zn(ii), and Cd(ii) complexes supported by 1-(3,5-dimethyl-1H-pyrazol-1-yl)-N-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-N-(furan-2-ylmethyl)methanamine (LA) and N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-4-isopropylaniline (LB) were synthesized. The direct chelation of CoCl2·6H2O, ZnCl2, and CdBr2·4H2O by the ligands produced [LnMX2] (Ln = LA or LB; M = Zn or Co, with X = Cl; M = Cd, with X = Br) complexes in high yields. Structural studies revealed that [LBCoCl2] and [LBZnCl2] adopted distorted tetrahedral geometries, as LB coordinated the metal centers in a bidentate fashion, while LA coordinated the metal centers in a tridentate fashion through the nitrogen atoms of the pyrazole and amine moieties, so that [LACoCl2] and [LAZnCl2] exhibited trigonal bipyramidal geometries and [LACdBr2] a square pyramidal geometry. [LBCdBr2] has two Cd-containing structures per unit cell, whereby one Cd center adopted a distorted tetrahedral geometry and the other exhibited square bipyramidal geometry. The in situ-generated alkyl derivatives of the synthesized complexes were assessed in the ring-opening polymerization of rac-lactide. Heterotactic polylactides (PLAs) were furnished with all complexes. The [LBZnCl2]/MeLi system produced PLA with a superior heterotactic bias (Pr up to 0.94) at −25 °C. PLAs with wide-ranging polydispersity indices (1.16–2.23) and low molecular weights were produced in all cases, irrespective of the specific M(II) center and ancillary ligand utilized. Co(ii), Zn(ii), and Cd(ii) complexes supported by bis-pyrazolyl ligands were applied to the ring-opening polymerization of rac-lactide to produce heterotactic polylactides (PLAs) with superior heterotactic bias i.e. Pr up to 0.94 at −25 °C.![]()
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Affiliation(s)
- Solhye Choe
- Department of Chemistry and Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Hyosun Lee
- Department of Chemistry and Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Saira Nayab
- Department of Chemistry
- Shaheed Benazir Bhutto University
- Islamic Republic of Pakistan
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4
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Fernández-Millán M, Ortega P, Cuenca T, Cano J, Mosquera MEG. Alkali-Metal Compounds with Bio-Based Ligands as Catalysts for Isoselective Lactide Polymerization: Influence of the Catalyst Aggregation on the Polymerization Control. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00237] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- María Fernández-Millán
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. del Río” (IQAR), University of Alcalá, Campus Universitario, 28871 Alcala de Henares, Madrid, Spain
| | - Paula Ortega
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Institute Ramón y Cajal for Health Research (IRYCIS), 28034 Madrid, Spain
| | - Tomás Cuenca
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. del Río” (IQAR), University of Alcalá, Campus Universitario, 28871 Alcala de Henares, Madrid, Spain
| | - Jesus Cano
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. del Río” (IQAR), University of Alcalá, Campus Universitario, 28871 Alcala de Henares, Madrid, Spain
| | - Marta E. G. Mosquera
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. del Río” (IQAR), University of Alcalá, Campus Universitario, 28871 Alcala de Henares, Madrid, Spain
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5
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Synthesis of zinc complexes bearing pyridine derivatives and their application of ε-caprolactone and L-Lactide polymerization. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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González DM, Cruz NB, Hernández LA, Oyarce J, Benavente R, Manzur C. Bis‐β‐(diketonates) Zn(II) complexes substituted with thiophene: Electropolymerization, homogeneous and heterogeneous catalysis for ring opening polymerization of lactide. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20190103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Darío M. González
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
| | - Nicole B. Cruz
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
| | - Loreto A. Hernández
- Laboratorio de Electroquímica, Instituto de Química y Bioquímica, Facultad de CienciasUniversidad de Valparaíso Avda. Gran Bretaña 1111, Playa Ancha, Valparaíso Chile
| | - Jocelyn Oyarce
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
| | - Rosario Benavente
- Instituto de Ciencia y Tecnología de Polímeros (ICTP‐CSIC) Juan de la Cierva, 3 28006 Madrid Spain
| | - Carolina Manzur
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
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7
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Lee J, Yoon M, Lee H, Nayab S. Stereoselective polymerization of methyl methacrylate and rac-lactide mediated by iminomethylpyridine based Cu(ii) complexes. RSC Adv 2020; 10:16209-16220. [PMID: 35493681 PMCID: PMC9052864 DOI: 10.1039/d0ra00805b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 04/16/2020] [Indexed: 12/11/2022] Open
Abstract
Iminomethylpyridine based copper(ii) complexes [LnCuCl2] (Ln = LA, LC–LF) and [LBCu(μ-Cl)Cl]2 have been synthesized and characterized.
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Affiliation(s)
- Jaegyeong Lee
- Department of Chemistry
- Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Minyoung Yoon
- Department of Chemistry
- Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Hyosun Lee
- Department of Chemistry
- Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Saira Nayab
- Department of Chemistry
- Shaheed Benazir Bhutto University
- Sheringal Dir (U)
- Islamic Republic of Pakistan
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8
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Zalevskaya OA, Gur'eva YA, Kutchin AV. Terpene ligands in the coordination chemistry: synthesis of metal complexes, stereochemistry, catalytic properties and biological activity. RUSSIAN CHEMICAL REVIEWS 2019. [DOI: 10.1070/rcr4880] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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9
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Li D, Gao B, Duan Q. Preparation of star-shaped functionalized polylactides by metal porphyrin complexes as both catalysts and cocatalysts. J PORPHYR PHTHALOCYA 2019. [DOI: 10.1142/s1088424619500603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Several aluminum porphyrin complexes as catalysts and a copper porphyrin complex as a cocatalyst were prepared. These complexes were characterized by 1H NMR and elemental analysis. These complexes are used for L-lactide polymerization. The kinetic data of the polymerization using complex 2 as catalyst revealed that the polymeric rates were first-ordered in both the monomer and catalyst. There is a linear relationship between lactide conversion and the number-averaged molecular weight of PLA.
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Affiliation(s)
- Dongni Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Department of Blood Transfusion, China–Japan Union Hospital of Jilin University, Jilin University, 126 Xiantai Street, Changchun, 130033, China
| | - Bo Gao
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun 130022, China
| | - Qian Duan
- School of Materials Science and Engineering, Changchun University of Science and Technology, 7989 Weixing Road, Changchun 130022, China
- Engineering Research Center of Optoelectronic Functional Materials, Ministry of Education, Changchun 130022, China
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10
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Hu Q, Jie S, Braunstein P, Li BG. Highly active tridentate amino-phenol zinc complexes for the catalytic ring-opening polymerization of ε-caprolactone. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.12.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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11
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Cho H, Jung MJ, Jeon J, Lee H, Nayab S. Synthesis, structural characterization and MMA polymerization studies of dimeric 5-coordinate copper(II), cadmium(II), and monomeric 4-coordinate zinc(II) complexes supported by N-methyl-N-((pyridine-2-yl)methyl)benzeneamine. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.12.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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12
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Schäfer PM, McKeown P, Fuchs M, Rittinghaus RD, Hermann A, Henkel J, Seidel S, Roitzheim C, Ksiazkiewicz AN, Hoffmann A, Pich A, Jones MD, Herres-Pawlis S. Tuning a robust system: N,O zinc guanidine catalysts for the ROP of lactide. Dalton Trans 2019; 48:6071-6082. [PMID: 30758389 DOI: 10.1039/c8dt04938f] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Non-toxic, highly active and robust complexes are the holy grail as ideal green catalysts for the polymerisation of biorenewable and biodegradable polylactide. Four new zinc guanidine complexes [ZnCl2(TMG4NMe2asme)], [ZnCl2(TMG5Clasme)], [ZnCl2(TMG5Measme)] and [ZnCl2(TMG5NMe2asme)] with different electron-donating and electron-withdrawing groups on the ligand's aromatic backbone have been synthesised. Ligands are derived from low-cost commercially available compounds and have been converted by a three- or four-step synthesis process into the desired ligand in good yields. The compounds have been fully characterised and tested in the ROP of rac-LA under industrially relevant conditions. The complexes are based on the recently published structure [ZnCl2(TMGasme)] which has shown high activity in the polymerisation of lactide at 150 °C. Different substituents in the para-position of the guanidine moiety significantly increase the polymerisation rate whereas positioning substituents in the meta-position causes no change in the reaction rate. With molecular weights over 71 000 g mol-1 being achievable, the best system produces polymers for multiple industrial applications and its polymerisation rate approaches that of Sn(Oct)2. The robust systems are able to polymerise non-purified lactide. The initiation of the polymerisation is suggested to occur due to impurities in the monomer.
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Affiliation(s)
- Pascal M Schäfer
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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13
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Kang MS, Cho J, Nayab S, Jeong JH. Synthesis and characterization of Zn(II) and Cu(II) complexes bearing (chiral substituent)(diethyl)-ethanediamine derivatives as precatalysts for rac-lactide polymerisation. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.10.068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Cho J, Chun MK, Nayab S, Jeong JH. Synthesis, characterisation, and X-ray structures of zinc(II) complexes bearing camphor-based ethyleneamineimines as pre-catalysts for heterotactic-enriched polylactide from rac-lactide. TRANSIT METAL CHEM 2018. [DOI: 10.1007/s11243-018-0282-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Duan R, Hu C, Sun Z, Pang X, Chen X. Zinc and Magnesium Complexes Bearing Oxazoline-Derived Ligands and Their Application for Ring Opening Polymerization of Cyclic Esters. ACS OMEGA 2018; 3:11703-11709. [PMID: 31459266 PMCID: PMC6645436 DOI: 10.1021/acsomega.8b01997] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 09/10/2018] [Indexed: 06/10/2023]
Abstract
A family of different substituents aza(oxazoline) ligand-based zinc and magnesium complexes were synthesized. These complexes can catalyze ring opening polymerization of ε-caprolactone (ε-CL) and lactide (LA) to produce poly-ε-caprolactone and polylactide with good conversions. Polymerization studies showed that the zinc complexes 1a-4a had moderate activity toward LA and ε-CL polymerization. In situ IR spectroscopy research of zinc complexes showed that the N-donor group-substituted complexes had higher activity than that of the O-ether donor group. The substituted analogies and the flexibility of the amino backbone had a distinct influence on the activity of LA and ε-CL polymerization. The alternates of zinc with magnesium produced complexes 5a-8a, which achieved an obviously increased polymerization activity. Among these magnesium complexes, 7a showed the highest activity in the polymerization of LA. At [M]/[cat] = 1000, the reaction progress was stabilized in 5 min with up to 97% conversion of a monomer at ambient temperature.
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Affiliation(s)
- Ranlong Duan
- Key
Laboratory of Polymer Ecomaterials, Changchun
Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Chenyang Hu
- Key
Laboratory of Polymer Ecomaterials, Changchun
Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
- University
of Chinese Academy of Sciences, Beijing 100049, P. R.
China
| | - Zhiqiang Sun
- Key
Laboratory of Polymer Ecomaterials, Changchun
Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Xuan Pang
- Key
Laboratory of Polymer Ecomaterials, Changchun
Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
| | - Xuesi Chen
- Key
Laboratory of Polymer Ecomaterials, Changchun
Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
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16
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Han Y, Gao A, Zhang Y, Yao W, Guan H. Zinc complexes supported by N,O-bidentate amino-alkoxyl ligands: Synthesis, characterization and catalytic property for the ring-opening polymerization of l-lactide. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.10.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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17
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Heo J, Lee H, Nayab S. Polymerizations of methyl methacrylate and rac-lactide by zinc(II) precatalyst containing N-substituted 2-iminomethylpyridine and 2-iminomethylquinoline. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1416106] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Joung Heo
- Department of Chemistry and Green-Nano Materials Research Centre, Kyungpook National University, Daegu, Republic of Korea
| | - Hyosun Lee
- Department of Chemistry and Green-Nano Materials Research Centre, Kyungpook National University, Daegu, Republic of Korea
| | - Saira Nayab
- Department of Chemistry, Shaheed Benazir Bhutto University, Sheringal Dir (U), Islamic Republic of Pakistan
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18
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Metz A, McKeown P, Esser B, Gohlke C, Kröckert K, Laurini L, Scheckenbach M, McCormick SN, Oswald M, Hoffmann A, Jones MD, Herres-Pawlis S. ZnII
Chlorido Complexes with Aliphatic, Chiral Bisguanidine Ligands as Catalysts in the Ring-Opening Polymerisation of rac
-Lactide Using FT-IR Spectroscopy in Bulk. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201701147] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Angela Metz
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Paul McKeown
- Centre for Sustainable Chemical Technologies; Department of Chemistry; University of Bath; Claverton Down BA2 7AY Bath United Kingdom
| | - Bastian Esser
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Clara Gohlke
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Konstantin Kröckert
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Larissa Laurini
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Michael Scheckenbach
- Department of Chemistry and Pharmacy; Ludwig-Maximlians University Munich; Butenandtstraße 5-13 81377 Munich Germany
| | - Strachan N. McCormick
- Centre for Sustainable Chemical Technologies; Department of Chemistry; University of Bath; Claverton Down BA2 7AY Bath United Kingdom
| | - Michaela Oswald
- Department of Chemistry and Pharmacy; Ludwig-Maximlians University Munich; Butenandtstraße 5-13 81377 Munich Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
| | - Matthew D. Jones
- Centre for Sustainable Chemical Technologies; Department of Chemistry; University of Bath; Claverton Down BA2 7AY Bath United Kingdom
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Germany
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19
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Reactivity of Zinc Halide Complexes Containing Camphor-Derived Guanidine Ligands with Technical rac-Lactide. INORGANICS 2017. [DOI: 10.3390/inorganics5040085] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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20
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Schäfer PM, Fuchs M, Ohligschläger A, Rittinghaus R, McKeown P, Akin E, Schmidt M, Hoffmann A, Liauw MA, Jones MD, Herres-Pawlis S. Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide. CHEMSUSCHEM 2017; 10:3547-3556. [PMID: 28779508 DOI: 10.1002/cssc.201701237] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2017] [Revised: 08/04/2017] [Indexed: 06/07/2023]
Abstract
New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X-Ray crystallography, and examined for their catalytic activity in the solvent-free ring-opening polymerization (ROP) of technical-grade rac-lactide at 150 °C. All complexes showed a high activity. The fastest complex [ZnCl2 (DMEGasme)] (C1) produced colorless poly(lactide) (PLA) after 90 min with a conversion of 52 % and high molar masses (Mw =69 100, polydispersity=1.4). The complexes were tested with different monomer-to-initiator ratios to determine the rate constant kp . Furthermore, a polymerization with the most active complex C1 was monitored by in situ Raman spectroscopy. Overall, conversion of up to 90 % can be obtained. End-group analysis was performed to clarify the mechanism. All four complexes combine robustness against impurities in the lactide with high polymerization rates, and they represent the fastest robust lactide ROP catalysts to date, opening new avenues to a sustainable ROP catalyst family for industrial use.
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Affiliation(s)
- Pascal M Schäfer
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Martin Fuchs
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Andreas Ohligschläger
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany
| | - Ruth Rittinghaus
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Paul McKeown
- Department of Chemistry, University of Bath, ClavertonDown, Bath, BA2 7AY, UK
| | - Enver Akin
- Fakultät für Naturwissenschaften, Department Chemie, Universität Paderborn, Warburger Strasse 100, 33098, Paderborn, Germany
| | - Maximilian Schmidt
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Marcel A Liauw
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany
| | - Matthew D Jones
- Department of Chemistry, University of Bath, ClavertonDown, Bath, BA2 7AY, UK
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
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21
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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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22
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Copper(II) complexes containing N,N′-bidentate N-substituted N-(pyridin-2-ylmethyl)amine: Synthesis, structure and application towards polymerization of rac-lactide. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.050] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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23
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Kwon KS, Nayab S, Lee HI, Jeong JH. Synthesis, characterisation, and X-ray structures of Zn(II) complexes containing bis-camphoryldiimine ligands: Application to polymerisation of rac-lactide. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Herber U, Hegner K, Wolters D, Siris R, Wrobel K, Hoffmann A, Lochenie C, Weber B, Kuckling D, Herres-Pawlis S. Iron(II) and Zinc(II) Complexes with Tetradentate Bis(pyrazolyl)methane Ligands as Catalysts for the Ring-Opening Polymerisation ofrac-Lactide. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601345] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ulrich Herber
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Katharina Hegner
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Daniel Wolters
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Rita Siris
- Department of Chemistry and Pharmacy; LMU Munich; Butenandtstr. 5-13 81377 München Germany
| | - Karina Wrobel
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Charles Lochenie
- Inorganic Chemistry II; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Birgit Weber
- Inorganic Chemistry II; University of Bayreuth; Universitätsstraße 30 95440 Bayreuth Germany
| | - Dirk Kuckling
- Department of Chemistry; Paderborn University; Warburger Str. 100 33098 Paderborn Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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25
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Metz A, Plothe R, Glowacki B, Koszalkowski A, Scheckenbach M, Beringer A, Rösener T, Michaelis de Vasconcellos J, Haase R, Flörke U, Hoffmann A, Herres-Pawlis S. Zinc Chloride Complexes with Aliphatic and Aromatic Guanidine Hybrid Ligands and Their Activity in the Ring-Opening Polymerisation ofd,l-Lactide. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600870] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Angela Metz
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Ramona Plothe
- Technische Universität Dortmund; Fakultät Chemie und Chemische Biologie; Otto-Hahn-Str. 6 44227 Dortmund Germany
| | - Britta Glowacki
- Technische Universität Dortmund; Fakultät Chemie und Chemische Biologie; Otto-Hahn-Str. 6 44227 Dortmund Germany
| | - Andreas Koszalkowski
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Michael Scheckenbach
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Andreas Beringer
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Thomas Rösener
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | | | - Roxana Haase
- Universität Paderborn, Anorganische Chemie; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Ulrich Flörke
- Universität Paderborn, Anorganische Chemie; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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26
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Rajashekhar B, Roymuhury SK, Chakraborty D, Ramkumar V. Group 4 metal complexes of Trost's semi-crown ligand: synthesis, structural characterization and studies on the ring-opening polymerization of lactides and ε-caprolactone. Dalton Trans 2016; 44:16280-93. [PMID: 26262508 DOI: 10.1039/c5dt02267c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of titanium(IV), zirconium(IV) and hafnium(IV) complexes of Trost's semi-crown ligand is described. All complexes were fully characterized by 1H and 13C NMR and mass spectroscopy. The molecular structures of the representative complexes 2, 3 and 4 were determined by single-crystal X-ray diffraction studies. The X-ray diffraction studies reveal that complexes 2, 3 and 4 crystallized in an orthorhombic crystal system. Complexes 2 and 3 have a monomeric structure in the solid state with distorted octahedral geometry around the metal center, whereas complex 4 was found to crystallize in a trimeric structure bridging with an oxygen atom, where the geometry around the titanium is distorted trigonal bipyramidal. The activities and stereoselectivities of these complexes toward the ring-opening polymerization (ROP) of lactides (L-LA and rac-LA) and ε-caprolactone (CL) have been investigated. Complexes 1–4 were found to be efficient single-component initiators for the ring-opening polymerization of cyclic esters and yielded high molecular weight polymers (Mn) with narrow molecular weight distributions (MWD).The microstructure of the resultant polylactides (PLAs) from rac-LA was determined. Complexes 2 and 3 afforded isotactic-enriched PLA (Pm = 0.78–0.71) with narrow MWD (1.07–1.04), on the other hand complexes 1 and 4 produced atactic PLA. Kinetic and post polymerization studies confirm that the polymerization proceeds through the coordination–insertion mechanism.
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Affiliation(s)
- Bijja Rajashekhar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600 036, Tamil Nadu, India.
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27
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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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28
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Roymuhury SK, Chakraborty D, Ramkumar V. Zwitterionic group 4 aminophenolate catalysts for the polymerization of lactides and ethylene. NEW J CHEM 2015. [DOI: 10.1039/c5nj00486a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of group 4 metal chloride complexes based on aminophenol ligands were synthesized and characterized by conventional spectroscopic techniques, elemental analysis and X-ray crystallography.
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Affiliation(s)
- Sagnik K. Roymuhury
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna-800 013
- India
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