1
|
Lynch JR, Kennedy AR, Barker J, Mulvey RE. Modification of a Common β-diketiminate NacNac Framework via Sequential Lithiation and Small Molecule Insertion. Chemistry 2023:e202303373. [PMID: 38032346 DOI: 10.1002/chem.202303373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/23/2023] [Accepted: 11/30/2023] [Indexed: 12/01/2023]
Abstract
A widely utilised class of ligands in synthesis and catalysis, β-diketiminate (BDI) or NacNac compounds were initially considered innocent in the sense that they remained intact in all their applications. That changed when the γ-C-H unit of their NCCCN backbone was found to engage in reactions with electrophiles. Here, we show that this special reactivity can be used advantageously to prepare tripodal modifications of the common NacNac ligand derived from 2,6-diisopropylphenyl-β-methyldiketimine [NacNacH (Me, Dipp)]. Lithiation to give NacNacLi, followed by reactions with isocyanates, isothiocyanates and a carbodiimide, have afforded a series of tripodal NacNac variants having N,N,N,O; N,N,N,S; or N,N,N,N potential dentation sites, many of which have been crystallographically characterised. Distinct ligating modes of these new ligands have been elucidated through the crystal structures of their lithiated derivatives.
Collapse
Affiliation(s)
- Jennifer R Lynch
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Alan R Kennedy
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Jim Barker
- Innospec Ltd., Oil Sites Road, Ellesmere Port, Cheshire, CH65 4EY, UK
| | - Robert E Mulvey
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| |
Collapse
|
2
|
Akintayo DC, Munzeiwa WA, Jonnalagadda SB, Omondi B. Ring-opening polymerization of lactides and ε-caprolactone catalyzed by Zn(II) aryl carboxylate complexes supported by 4-pyridinyl schiff base ligands. Heliyon 2023; 9:e13514. [PMID: 36846710 PMCID: PMC9950825 DOI: 10.1016/j.heliyon.2023.e13514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 01/26/2023] [Accepted: 02/01/2023] [Indexed: 02/08/2023] Open
Abstract
Synthesis and catalytic studies of aryl carboxylate Zn (II) complexes is reported. Reaction of substituted (E)-N-phenyl-1-(pyridin-4-yl)methanimine with a methanolic solution of Zn(CH3COO)2 and substituted aryl carboxylate co-ligands gave heteroleptic Zn(II) complexes; [Zn(C6H5COO)2(L1)]2 (1), [Zn(C7H7COO)2(L1)]2 (2), [Zn (4-F-C6H4COO)2(L1)]2 (3), [Zn(C6H5COO)2(L2)]2 (4), [Zn(C7H7COO)2(L2)]2 (5), [Zn (4-F-C6H4COO)2(L2)]2 (6), [Zn(C6H5COO)2(L3)]2 (7), [Zn(C7H7COO)2(L3)]2 (8), [Zn (4-F-C6H4COO)2(L3)]2 (9). The molecular structures of complexes 1 and 4 are dinuclear with the zinc atom in complex 1 adopting a distorted trigonal bipyramidal geometry in a bi-metallacycle while complex 4 is square pyramidal where all four benzoate ligands bridge the zinc metals in a paddle wheel arrangement. All complexes successfully initiated mass/bulk ring-opening polymerization (ROP) of ϵ-caprolactone (ϵ-CL) and lactides (LAs) monomers with or without alcohol co-initiators at elevated temperatures. Complexes 1, 4 and 6 containing the unsubstituted benzoate co-ligands were the most active in their triad; with complex 4 being the most active (k app) of 0.3450 h-1. The physicochemical properties of the polymerization products of l-lactide and rac-lactide in toluene revealed melting temperatures (Tm) between 116.58 °C and 188.03 °C, and decomposition temperatures between 278.78 °C and 331.32 °C suggestive of an isotactic PLA with a metal capped end.
Collapse
Affiliation(s)
- Damilola C. Akintayo
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, 4000, South Africa
| | - Wisdom A. Munzeiwa
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, 4000, South Africa,Chemistry Department, Bindura University of Science Education, Private Bag 1020, Bindura, Zimbabwe
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, 4000, South Africa
| | - Bernard Omondi
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, 4000, South Africa,Corresponding author.
| |
Collapse
|
3
|
Jung HJ, Nyamayaro K, Baalbaki HA, Goonesinghe C, Mehrkhodavandi P. Cooperative Initiation in a Dinuclear Indium Complex for CO 2 Epoxide Copolymerization. Inorg Chem 2023; 62:1968-1977. [PMID: 36688644 DOI: 10.1021/acs.inorgchem.2c03192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Dinuclear indium complexes have been synthesized and characterized. These include neutral and cationic indium complexes supported by a Schiff base ligand bearing a binaphthol linker. The new compounds were investigated for alternating copolymerization of CO2 and cyclohexene oxide. In particular, the neutral indium chloride complex (±)-[(ONapNiN)InCl2]2 (4) showed high conversion of cyclohexene oxide and selectivity for poly(cyclohexene carbonate) formation without cocatalysts at 80 °C under various CO2 pressures (2-30 bar). Importantly, the reactivity of the dinuclear indium chloride complex 4 is drastically different from that of the mononuclear indium chloride complex (±)-(NNiOtBu)InCl2 (5), suggesting a cooperative initiation mechanism involving the two indium centers in 4.
Collapse
Affiliation(s)
- Hyuk-Joon Jung
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Kudzanai Nyamayaro
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Hassan A Baalbaki
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Chatura Goonesinghe
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| |
Collapse
|
4
|
Meng X, Qi Z, Yu L, Zhang Y. Catalytic System for Poly(lactic acid) Synthesis: Opportunities and Challenges. CHINESE J ORG CHEM 2023. [DOI: 10.6023/cjoc202206051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
|
5
|
Glöckler E, Ghosh S, Schulz S. β-Diketiminate and β-Ketoiminate Metal Catalysts for Ring-Opening Polymerization of Cyclic Esters. POLYM REV 2022. [DOI: 10.1080/15583724.2022.2121837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Eduard Glöckler
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
| | - Swarup Ghosh
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
| | - Stephan Schulz
- Institute for Inorganic Chemistry, University of Duisburg-Essen, Essen, Germany
- Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg, Germany
| |
Collapse
|
6
|
Wang L, Lu Y, Zhang L, Fang H, Zhang X, Li Y. Synthesis, structures, and catalytic activity toward the ring-opening polymerization of ε-caprolactone of zinc complexes supported by β-diketiminate ligands with a large aryl group. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
7
|
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]
|
8
|
Akintayo DC, Munzeiwa WA, Jonnalagadda SB, Omondi B. Influence of nuclearity and coordination geometry on the catalytic activity of Zn(II) carboxylate complexes in ring-opening polymerization of ε-caprolactone and lactides. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
9
|
N3/4-pyridinyl Schiff base copper(II) benzoate complexes: synthesis, crystal structures and ring-opening polymerization studies. TRANSIT METAL CHEM 2022. [DOI: 10.1007/s11243-022-00494-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
10
|
Akintayo DC, Munzeiwa WA, Jonnalagadda SB, Omondi B. Ring-opening polymerization of cyclic esters by 3- and 4-pyridinyl Schiff base Zn(II) and Cu(II) paddlewheel complexes: kinetic, mechanistic and tacticity studies. ARAB J CHEM 2021. [DOI: 10.1016/j.arabjc.2021.103313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
11
|
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
| |
Collapse
|
12
|
Lee J, Kim K, Lee H, Nayab S. Cobalt(II) complexes supported by iminomethylpyridine derived ligands: Synthesis, characterization and catalytic application towards methyl methacrylate and rac-lactide polymerisations. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.115003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
13
|
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.
Collapse
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
| | | |
Collapse
|
14
|
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.![]()
Collapse
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
| |
Collapse
|
15
|
Chahrour T, Castonguay A, Oguadinma PO, Schaper F, Zargarian D. Reactions of a pincer proligand with copper iodide: bridging instead of C–H metalation. CAN J CHEM 2020. [DOI: 10.1139/cjc-2020-0058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Various precursors of divalent copper have been treated with the meta-disubstituted phenylene-based proligand POC(H)OP (1,3-(i-Pr2PO)2C6H4) with the objective of preparing classical pincer complexes (POCOP)CuX. However, in no case was such species obtained, presumably owing to the difficult C–H metallation step. Analogous reactions of monovalent precursors were also unsuccessful, whereas reaction of POC(H)OP with CuI under different conditions gave the non-metallated adducts {(μ, κP, [Formula: see text]-POC(H)OP)Cu(μ-Ι)}2, 1, {(μ, κP, [Formula: see text]-POC(H)OP)Cu2(μ-Ι)2(DMAP)2}, 2 (DMAP = 4-dimethylaminopyridine), and {(μ, κP, [Formula: see text]-POC(H)OP)Cu2(μ3-Ι)2}2, 3. Treating 1 with DMAP gave the adduct 2, whereas 3 could be obtained by treating 1 with BuLi or by sublimation of 1. The solid state structures of these complexes revealed the tetrahedral geometry that might be anticipated for the d10 Cu(I) centers, in addition to fairly close I–H distances; on the other hand, no C–H interaction (agostic or otherwise) was observed with the Cu centers in any of these structures. The unsuccessful metallation of the C(2)–H moiety is thought to be a result of the strong preference of monovalent copper center to form bridging interactions with iodide and the POC(H)OP ligand; this appears to prevent the approach of the central carbon of the ligand to the Cu centers.
Collapse
Affiliation(s)
- Taghrid Chahrour
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Annie Castonguay
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Paul O. Oguadinma
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Frank Schaper
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Davit Zargarian
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
| |
Collapse
|
16
|
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.
Collapse
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
| |
Collapse
|
17
|
Samanta S, Rajasekhar K, Babagond V, Govindaraju T. Small Molecule Inhibits Metal-Dependent and -Independent Multifaceted Toxicity of Alzheimer's Disease. ACS Chem Neurosci 2019; 10:3611-3621. [PMID: 31140779 DOI: 10.1021/acschemneuro.9b00216] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Alzheimer's disease (AD) is one of the most devastating forms of dementia, without reliable treatments to cure, delay the onset, or prevent the disease progression. The proposed toxic mechanisms of AD include amyloidogenesis of amyloid β (Aβ), metal ion dyshomeostasis, redox active metal-Aβ inclusion complex formation, and generation of excessive reactive oxygen and nitrogen species (ROS and RNS). The imbalance in redox homeostasis causes oxidative stress, DNA damage, mitochondrial dysfunction, and inflammation, which collectively become a major hurdle in the development of effective therapeutic agents for multifactorial AD. This necessitates a multifunctional strategy to develop effective therapeutic agents to inhibit multifaceted toxicity. In this context, we report a rational design, synthesis, and detailed study to identify a small molecule multifunctional modulator (MFM) inspired by the human origin tripeptide. The lead, MFM 4, chelates and sequesters metal ions, disrupts their redox cycles, prevents excessive ROS production and oxidative stress, ameliorates oxidative DNA damage and mitochondrial dysfunction, and modulates Nrf2 protein signaling under oxidative stress conditions by eliminating the toxic stress elements. The MFM 4 was found to inhibit metal-dependent and -independent Aβ aggregation and qualified as a suitable candidate to inhibit Aβ-induced neuronal toxicity. The NMR spectroscopy study revealed molecular-level interactions of 4 with Aβ42, which explain the mechanism of aggregation inhibition. Furthermore, 4 effectively inhibited inflammation as revealed by reduction in nitric oxide (NO) production in LPS-activated glial cells. These key features make 4 a potential MFM platform to develop therapeutic agents for metal (Cu, Zn and Fe)-dependent and -independent multifaceted Aβ toxicity of AD.
Collapse
Affiliation(s)
- Sourav Samanta
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru, 560064 Karnataka, India
| | - Kolla Rajasekhar
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru, 560064 Karnataka, India
| | - Vardhaman Babagond
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru, 560064 Karnataka, India
| | - Thimmaiah Govindaraju
- Bioorganic Chemistry Laboratory, New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru, 560064 Karnataka, India
| |
Collapse
|
18
|
Ghosh S, Schäfer PM, Dittrich D, Scheiper C, Steiniger P, Fink G, Ksiazkiewicz AN, Tjaberings A, Wölper C, Gröschel AH, Pich A, Herres‐Pawlis S, Schulz S. Heterolepic β-Ketoiminate Zinc Phenoxide Complexes as Efficient Catalysts for the Ring Opening Polymerization of Lactide. ChemistryOpen 2019; 8:951-960. [PMID: 31338277 PMCID: PMC6625107 DOI: 10.1002/open.201900203] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Indexed: 11/25/2022] Open
Abstract
Zinc phenoxide complexes L1ZnOAr 1-4 (L1=Me2NC2H4NC(Me)CHC(Me)O) and L2ZnOAr 5-8 (L2=Me2NC3H6NC(Me)CHC(Me)O) with donor-functionalized β-ketoiminate ligands (L1/2) and OAr substituents (Ar=Ph 1, 5; 2,6-Me2-C6H3 2, 6; 3,5-Me2-C6H3 3, 7; 4-Bu-C6H4 4, 8) with tuneable electronic and steric properties were synthesized and characterized. 1-8 adopt binuclear structures in the solid state except for 5, while they are monomeric in CDCl3 solution. 1-8 are active catalysts for the ring opening polymerization (ROP) of lactide (LA) in CH2Cl2 at ambient temperature and the catalytic activity is controlled by the electronic and steric properties of the OAr substituent, yielding polymers with high average molecular weight (M n) and moderately controlled molecular weight distribution (MWDs). 1 and 5 showed a living polymerization character and kinetic studies on the ROP of L-LA with 1 and 5 proved first order dependencies on the monomer concentration. Homonuclear decoupled 1H-NMR analyses of polylactic acid (PLA) formed with rac-LA proved isotactic enrichment of the PLA microstructure.
Collapse
Affiliation(s)
- Swarup Ghosh
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Pascal M. Schäfer
- Institute of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Dennis Dittrich
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Christoph Scheiper
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Phillip Steiniger
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - Gerhard Fink
- Institute of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Agnieszka N. Ksiazkiewicz
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 252074AachenGermany
- DWI – Leibniz Institute for Interactive Materials e. V.Forckenbeckstraße 5042074AachenGermany
| | - Alexander Tjaberings
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) NanoEnergieTechnikZentrumCarl-Benz-Str. 19947057Duisburg
| | - Christoph Wölper
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| | - André H. Gröschel
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE) NanoEnergieTechnikZentrumCarl-Benz-Str. 19947057Duisburg
| | - Andrij Pich
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 252074AachenGermany
- DWI – Leibniz Institute for Interactive Materials e. V.Forckenbeckstraße 5042074AachenGermany
- Aachen Maastricht Institute for Biobased Materials (AMIBM)Maastricht University, Brightlands Chemelot CampusUrmonderbaan 226167RD GeleenThe Netherlands
| | - Sonja Herres‐Pawlis
- Institute of Inorganic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Stephan Schulz
- Faculty of ChemistryUniversity of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE)Universitätsstr. 7, S07 S03 C30D-45141Essen
| |
Collapse
|
19
|
Hardouin Duparc V, Dimeck C, Schaper F. Replacing sulfonate by carboxylate: application of pyridyliminocarboxylato copper(II) complexes in rac-lactide polymerization and Chan–Evans–Lam coupling. CAN J CHEM 2019. [DOI: 10.1139/cjc-2018-0402] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Copper(II) complexes carrying pyridylmethyleneaminobenzoate or –propanoate ligands, LCuX, were prepared in one-pot reactions from pyridinecarboxaldehyde, aminobenzoic acid or β-alanine, and CuX2 (X = Cl, NO3, OAc, or OTf). All complexes were characterized by single-crystal X-ray diffraction studies and formed either dimers, tetramers, or coordination polymers. Attempted preparation of the respective alkoxide complexes, LCu(OR), was unsuccessful, but use of LCuX/NaOMe mixtures in rac-lactide polymerization indicated under some conditions coordination–insertion polymerization via a copper alkoxide as the mechanism. The complexes performed poorly in rac-lactide polymerization, showing low activities (12 h to completion at 140 °C), low to moderate heterotacticity (Pr = 0.6–0.8), and poor polymer molecular weight control (intramolecular transesterification). They were competent catalysts for Chan–Evans–Lam couplings with phenylboronic acid, without any indication of side reactions such as deboration or aryl homocoupling. The complexes were active in undried methanol, without addition of base, ligand, or molecular sieves. Aniline, n-octylamine, and cyclohexylamine were coupled quantitatively under identical reaction conditions. There is only little influence of the anion on activities (less than a factor of 2) but a strong influence on induction periods. The complexes were not active in CEL coupling with alcohols, phenols, or alkylboronic acids.
Collapse
Affiliation(s)
- Valérie Hardouin Duparc
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
| | - Clémentine Dimeck
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
| | - Frank Schaper
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
| |
Collapse
|
20
|
Daneshmand P, Randimbiarisolo A, Schaper F. Tetradentate iminophenolate copper complexes in rac-lactide polymerization. CAN J CHEM 2019. [DOI: 10.1139/cjc-2018-0287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Copper(II) nitrate complexes of 2-(((2-((2-aminoethyl)amino)ethyl)imino)methyl)phenol, 2-(((2-((2-aminoethyl)amino)ethyl)imino)methyl)-4,6-dichlorophenol, 2-(((2-(piperazin-1-yl)ethyl)imino)methyl)phenol and (2,4-di-tert-butyl-6-(((2-(piperazin-1-yl)ethyl)imino)methyl)phenol, as well as a copper(II) acetate complex of 2-(((2-(piperidin-1-yl)ethyl)imino)methyl)phenol, have been prepared and characterized by X-ray diffraction studies. In combination with benzyl alcohol, all complexes are active in rac-lactide polymerization at 140 °C in molten monomer to provide moderately heterotactic polylactic acid. Most complexes showed complicated reaction kinetics, indicative of two interconverting active species. Molecular weight control was poor and a strong tendency toward intramolecular transesterification led to oligomeric products. There was no indication that the basic site of the ligand is participating in the polymerization reaction by deprotonation of the alcohol nucleophile.
Collapse
Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
| | - Aurélie Randimbiarisolo
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
| | - Frank Schaper
- Centre in Green Chemistry and Catalysis, Département de chimie, Université de Montréal, 2900 Boul. E.-Montpetit, Montréal, QC H3T 1J4, Canada
| |
Collapse
|
21
|
Kremer AB, Mehrkhodavandi P. Dinuclear catalysts for the ring opening polymerization of lactide. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.09.008] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
22
|
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]
|
23
|
Daneshmand P, Pinon L, Schaper F. Dinuclear iminophenoxide copper complexes in rac-lactide polymerisation. Dalton Trans 2018; 47:10147-10161. [PMID: 30009292 DOI: 10.1039/c8dt02140f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dinuclear bis(R'-(R''-iminomethyl)phenoxide) copper complexes L2Cu2(μ-OR)2 were prepared from the reaction of copper methoxide with ROH and LH (ROH = dimethylaminoethanol or pyridylmethanol, R' = H, 4,6-tBu, 1,3-Cl, R'' = benzyl, cyclohexyl, diphenylmethyl and 2,6-dimethylphenyl). Preparation was complicated by formation of homoleptic L2Cu and only 9 of the 24 possible combinations could be prepared. All complexes were characterized by single crystal X-ray diffraction studies and crystallized as dinuclear penta-coordinated complexes. Homoleptic complexes L2Cu were inactive in lactide polymerization at room temperature. Most heteroleptic complexes showed modest to good activities with full conversion in less than 6 h at room temperature. Complexes with R' = H showed poor molecular weight control, complexes with R' = Cl were inactive in polymerization. In pyridylmethoxide-containing complexes, only one alkoxide initiated chain growth. All complexes produced atactic polymer.
Collapse
Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry and Catalysis, Department of chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, QC H3 T 3J7, Canada.
| | | | | |
Collapse
|
24
|
Daneshmand P, Jiménez-Santiago JL, Aragon--Alberti M, Schaper F. Catalytic-Site-Mediated Chain-End Control in the Polymerization of rac-Lactide with Copper Iminopyrrolide Complexes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00196] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
| | - José L. Jiménez-Santiago
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
| | - Maxime Aragon--Alberti
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
| | - Frank Schaper
- Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Quebec H3T 3J7, Canada
| |
Collapse
|
25
|
Munzeiwa WA, Nyamori VO, Omondi B. Zn(II) and Cu(II) unsymmetrical formamidine complexes as effective initiators for ring-opening polymerization of cyclic esters. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4247] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Wisdom A. Munzeiwa
- School of Chemistry and Physics; University of KwaZulu-Natal; Westville Campus, Private Bag X54001 Durban 4000 South Africa
| | - Vincent O. Nyamori
- School of Chemistry and Physics; University of KwaZulu-Natal; Westville Campus, Private Bag X54001 Durban 4000 South Africa
| | - Bernard Omondi
- School of Chemistry and Physics; University of KwaZulu-Natal; Westville Campus, Private Bag X54001 Durban 4000 South Africa
| |
Collapse
|
26
|
Shin S, Cho H, Lee H, Nayab S, Kim Y. Zinc(II) complexes containing N′-aromatic group substituted N,N′,N-bis((1H-pyrazol-1-yl)methyl)amines: Synthesis, characterization, and polymerizations of methyl methacrylate and rac-lactide. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1437266] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Sujin Shin
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, Republic of Korea
| | - Hyungwoo Cho
- 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, Sheringal Dir (U), Islamic Republic of Pakistan
| | - Younghak Kim
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Republic of Korea
| |
Collapse
|
27
|
Polymerizations of methyl methacrylate and rac-lactide by 4-coordinate cobalt(II) complexes supported by N′-substituted N,N′,N-bis((1H-pyrazol-1-yl)methyl)amine derivatives. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.12.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
28
|
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
| |
Collapse
|
29
|
Munzeiwa WA, Omondi B, Nyamori VO. Synthesis and polymerization kinetics of ε-caprolactone and ʟ-lactide to low molecular weight polyesters catalyzed by Zn(II) and Cu(II) N -hydroxy- N , N ′-diarylformamidine complexes. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.09.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
30
|
Chun MK, Cho J, Nayab S, Jeong JH. Polymerization of rac
-Lactide Using Zinc(II) and Copper(II) Complexes of N
1
,N
1
-Dimethyl-N
2
-[(1R
)-Myrtenylmethyl]Ethane-1,2-Diamine. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11323] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Min Kyung Chun
- Department of Chemistry and Green-Nano Materials Research Center; Kyungpook National University; Daegu 41566 Republic of Korea
| | - Juhyun Cho
- Department of Chemistry and Green-Nano Materials Research Center; Kyungpook National University; Daegu 41566 Republic of Korea
| | - Saira Nayab
- Department of Chemistry; Shaheed Benazir Bhutto University; Peshawar Republic of Pakistan
| | - Jong Hwa Jeong
- Department of Chemistry and Green-Nano Materials Research Center; Kyungpook National University; Daegu 41566 Republic of Korea
| |
Collapse
|
31
|
Ghosh S, Spannenberg A, Mejía E. Cubane-Type Polynuclear Zinc Complexes Containing Tridentate Schiff
Base Ligands: Synthesis, Characterization, and Ring-Opening Polymerization Studies of rac
-Lactide and ε
-Caprolactone. Helv Chim Acta 2017. [DOI: 10.1002/hlca.201700176] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Swarup Ghosh
- Leibniz Institute for Catalysis; University of Rostock; Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Anke Spannenberg
- Leibniz Institute for Catalysis; University of Rostock; Albert-Einstein-Str. 29a 18059 Rostock Germany
| | - Esteban Mejía
- Leibniz Institute for Catalysis; University of Rostock; Albert-Einstein-Str. 29a 18059 Rostock Germany
| |
Collapse
|
32
|
Daneshmand P, Fortun S, Schaper F. Diiminopyrrolide Copper Complexes: Synthesis, Structures, and rac-Lactide Polymerization Activity. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00609] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Solène Fortun
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Frank Schaper
- Centre in Green Chemistry
and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| |
Collapse
|
33
|
Daneshmand P, van der Est A, Schaper F. Mechanism and Stereocontrol in Isotactic rac-Lactide Polymerization with Copper(II) Complexes. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02049] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pargol Daneshmand
- Centre
in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Art van der Est
- Department
of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | - Frank Schaper
- Centre
in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| |
Collapse
|
34
|
Hardouin Duparc V, Schaper F. Sulfonato-diketimine Copper(II) Complexes: Synthesis and Application as Catalysts in Chan–Evans–Lam Couplings. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00397] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Valérie Hardouin Duparc
- Centre in Green Chemistry
and Catalysis, Department of chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Frank Schaper
- Centre in Green Chemistry
and Catalysis, Department of chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, Québec H3T 3J7, Canada
| |
Collapse
|
35
|
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]
|
36
|
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]
|
37
|
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]
|
38
|
Catalytic Systems for the Production of Poly(lactic acid). SYNTHESIS, STRUCTURE AND PROPERTIES OF POLY(LACTIC ACID) 2017. [DOI: 10.1007/12_2017_20] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
39
|
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]
|
40
|
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
| | | |
Collapse
|
41
|
Mandal M, Monkowius U, Chakraborty D. Cadmium acetate as a ring opening polymerization catalyst for the polymerization of rac-lactide, ε-caprolactone and as a precatalyst for the polymerization of ethylene. JOURNAL OF POLYMER RESEARCH 2016. [DOI: 10.1007/s10965-016-1099-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
42
|
Mandal M, Oppelt K, List M, Teasdale I, Chakraborty D, Monkowius U. Copper(II) complexes with imino phenoxide ligands: synthesis, characterization, and their application as catalysts for the ring-opening polymerization of rac-lactide. MONATSHEFTE FUR CHEMIE 2016; 147:1883-1892. [PMID: 27795584 PMCID: PMC5063905 DOI: 10.1007/s00706-016-1830-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/26/2016] [Indexed: 11/28/2022]
Abstract
ABSTRACT Four new copper complexes based on bidentate imino phenoxide ligands were synthesized and characterized by IR, UV-Vis spectroscopy, ESI mass spectrometry, single crystal X-ray diffraction, and electrochemistry. The crystal structures revealed that the copper(II) atoms are surrounded by phenolate oxygen and imine nitrogen atoms of two ligands in a distorted square-planar geometry. The existence of ligand-centered, as well as Cu(II)-centered quasi-reversible and reversible redox reactions are observed in the cyclic voltammetry experiments of all the complexes. All complexes are able to catalyze the ring-opening polymerization of rac-lactide yielding polymers with moderate molecular weights and moderately broad molecular weight distributions. GRAPHICAL ABSTRACT
Collapse
Affiliation(s)
- Mrinmay Mandal
- Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
- Department of Chemistry, Indian Institute of Technology Patna, Patna, Bihar 800 013 India
| | - Kerstin Oppelt
- Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
| | - Manuela List
- Institute for Chemical Technology of Organic Materials, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
| | - Ian Teasdale
- Institute of Polymer Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
| | - Debashis Chakraborty
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600 036 India
| | - Uwe Monkowius
- Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria
| |
Collapse
|
43
|
Cho J, Nayab S, Jeong JH. Stereoselective polymerisation of rac-lactide catalysed by Cu(II) complexes bearing chloro derivatives of N,N′-bis(benzyl)dimethyl-(R,R)-1,2-diaminocyclohexane. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.04.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
44
|
Duan YL, He JX, Wang W, Zhou JJ, Huang Y, Yang Y. Synthesis and characterization of dinuclear rare-earth complexes supported by amine-bridged bis(phenolate) ligands and their catalytic activity for the ring-opening polymerization of l-lactide. Dalton Trans 2016; 45:10807-20. [PMID: 27294827 DOI: 10.1039/c6dt01486k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of amine-bridged bis(phenolate) protio-ligands N,N-bis(3,5-di-tert-butyl-2-hydroxybenzyl)aminoacetic acid (L(1)-H3) and N,N-bis[3,5-bis(α,α'-dimethylbenzyl)-2-hydroxybenzyl]aminoacetic acid (L(2)-H3), with 1 equiv. M[N(SiMe3)2]3 (M = La, Nd, Sm, Gd, Y) in THF at room temperature yielded the neutral rare-earth complexes [M2(L)2(THF)4] (L = L(1), M = La (), Nd (), Sm (), Gd (), Y (); L = L(2), M = La (), Nd (), Sm (), Gd (), Y ()). All of these complexes were characterized by single-crystal X-ray diffraction, elemental analysis and in the case of yttrium and lanthanum complexes, (1)H NMR spectroscopy. The molecular structure of revealed dinuclear species in which the eight-coordinate lanthanum centers were bonded to two oxygen atoms of two THF molecules, to three oxygen atoms and one nitrogen atom of one L(1) ligand, and two oxygen atoms of the carboxyl group of another. Complexes were also dinuclear species containing seven-coordinate metal centers similar to , albeit with bonding to one rather than two carboxyl group oxygens of another ligand. Further treatment of with excess benzyl alcohol provided dinuclear complex [La2(L(1))2(BnOH)6] (), in which each lanthanum ion is eight-coordinate, bonded to three oxygen atoms and one nitrogen atom of one ligand, three oxygen atoms of three BnOH molecules, as well as one oxygen atom of bridging carboxyl group of the other ligand. In the presence of BnOH, complexes efficiently catalyzed the ring-opening polymerization of l-lactide in a controlled manner and gave polymers with relatively narrow molecular weight distributions. The kinetic and mechanistic studies associated with the ROP of l-lactide using /BnOH initiating system have been performed.
Collapse
Affiliation(s)
- Yu-Lai Duan
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Jia-Xuan He
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Wei Wang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Jing-Jing Zhou
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Yong Huang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| | - Ying Yang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China.
| |
Collapse
|
45
|
Kremer AB, Osten KM, Yu I, Ebrahimi T, Aluthge DC, Mehrkhodavandi P. Dinucleating Ligand Platforms Supporting Indium and Zinc Catalysts for Cyclic Ester Polymerization. Inorg Chem 2016; 55:5365-74. [PMID: 27187767 DOI: 10.1021/acs.inorgchem.6b00358] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The synthesis of the first alkoxide-bridged indium complex supported by a chiral dinucleating ligand platform (1), along with its zinc analogue (2), is reported. Both complexes are synthesized in a one-pot reaction starting from a chiral dinucleating bis(diamino)phenolate ligand platform, sodium ethoxide, and respective metal salts. The dinucleating indium analogue (7) based on an achiral ligand backbone is also reported. Indium complexes bearing either the chiral or achiral ligand catalyze the ring-opening polymerization of racemic lactide (rac-LA) to afford highly heterotactic poly(lactic acid) (PLA; Pr > 0.85). The indium complex bearing an achiral ligand affords essentially atactic PLA from meso-LA. The role of the dinucleating ligand structure in catalyst synthesis and polymerization activity is discussed.
Collapse
Affiliation(s)
- Alexandre B Kremer
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Kimberly M Osten
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Insun Yu
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Tannaz Ebrahimi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Dinesh C Aluthge
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| |
Collapse
|
46
|
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]
|
47
|
Ou HW, Lo KH, Du WT, Lu WY, Chuang WJ, Huang BH, Chen HY, Lin CC. Synthesis of Sodium Complexes Supported with NNO-Tridentate Schiff Base Ligands and Their Applications in the Ring-Opening Polymerization of L-Lactide. Inorg Chem 2016; 55:1423-32. [PMID: 26828572 DOI: 10.1021/acs.inorgchem.5b02043] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of sodium complexes bearing NNO-tridentate Schiff base ligands with an N-pendant arm were synthesized and used as catalysts for the ring-opening polymerization of L-lactide (L-LA). Electronic effects of ancillary ligands coordinated by sodium complexes substantially influence the catalysis, and ligands with electron-donating groups increase the catalytic activity of the sodium complexes for catalyzing L-LA polymerization. In particular, a sodium complex bearing a 4-methoxy group has the highest activity with conversion up to 95% within 30 s at 0 °C and a low polydispersity index of 1.13, whereas the 4-bromo group showed the poorest performance with regard to the catalytic rate of L-LA polymerization in the presence of benzyl alcohol (BnOH). (1)H NMR pulsed-gradient spin-echo diffusion experiments and single-crystal X-ray analyses showed that sodium complexes [L(H)Na(THF)]2 and [L(4-Cl)Na(THF)]2 were dinuclear species in both solution and the solid state. The kinetic results indicated a first-order dependence on each of [[L(4-Cl)Na]2], [l-LA], and [BnOH].
Collapse
Affiliation(s)
- Hsiu-Wei Ou
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Kai-Hsuan Lo
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wei-Ting Du
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wei-Yi Lu
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Wan-Jung Chuang
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University , Kaohsiung 80708, Taiwan, Republic of China
| | - Bor-Hunn Huang
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University , Kaohsiung 80708, Taiwan, Republic of China
| | - Chu-Chieh Lin
- Department of Chemistry, National Chung Hsing University , Taichung 402, Taiwan, Republic of China
| |
Collapse
|
48
|
Chuang WJ, Huang YT, Chen YH, Lin YS, Lu WY, Lai YC, Chiang MY, Hsu SCN, Chen HY. Synthesis, characterization, and catalytic activity of sodium ketminiate complexes toward the ring-opening polymerization of l-lactide. RSC Adv 2016. [DOI: 10.1039/c6ra00373g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Na complexes bearing ketiminate ligands revealed the greater catalytic activity and polymer controllability than that of Na complexes bearing Schiff base ligands.
Collapse
Affiliation(s)
- Wan-Jung Chuang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yen-Tzu Huang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yu-Hsieh Chen
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yu-Shan Lin
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Wei-Yi Lu
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Yi-Chun Lai
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Michael Y. Chiang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
- Department of Chemistry
| | - Sodio C. N. Hsu
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
- Kaohsiung 80708
- Republic of China
| |
Collapse
|
49
|
Camp C, Arnold J. On the non-innocence of “Nacnacs”: ligand-based reactivity in β-diketiminate supported coordination compounds. Dalton Trans 2016; 45:14462-98. [DOI: 10.1039/c6dt02013e] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
While β-diketiminate (BDI or ‘nacnac’) ligands have been widely adopted to stabilize a wide range of metal ions in multiple oxidation states and coordination numbers, in several occurrences these ligands do not behave as spectators and participate in reactivity.
Collapse
Affiliation(s)
- Clément Camp
- Univ Lyon
- CNRS, ESCPE Lyon
- Université Claude Bernard Lyon 1
- C2P2 UMR 5265
- F-69616 Villeurbanne
| | - John Arnold
- Department of Chemistry
- University of California
- Berkeley
- USA
| |
Collapse
|
50
|
Daneshmand P, Schaper F. Exploring the reactivity of manganese(III) complexes with diphenolate-diamino ligands in rac-lactide polymerization. Dalton Trans 2015; 44:20449-58. [PMID: 26541417 DOI: 10.1039/c5dt03756e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Manganese(III) complexes of tetradentate diphenolate-diamino (NNOO(2-)) ligands were prepared from aerobic reaction of MnCl2 with the respective ligands in basic methanolic solution. Methoxide complexes (NNOO)Mn(OMe)(MeOH)0-1 were obtained for three ligands, while others only provided the respective chloride complexes (NNOO)Mn(Cl)(MeOH). Complexes were analyzed by X-ray diffraction studies and octahedral complexes showed evidence of Jahn-Teller distortions. Magnetic moments determined in MeOD were indicative of high-spin Mn(III)-d(4) complexes (μeff = 4.2-4.6μB). Methoxide complexes were active in the coordination-insertion polymerization of rac-lactide (130 °C, 0.33-1.0 mol% catalyst loading) to yield atactic polylactic acid with moderate molecular weight control. Polymerization activity was reduced, but not suppressed by the presence of protic impurities. Chloride complexes showed less activity and only in the presence of external alcohol, indicative of an activated-monomer mechanism.
Collapse
Affiliation(s)
- Pargol Daneshmand
- Centre in Green Chemistry and Catalysis, Department of chemistry, Université de Montréal, C. P. 6128 Succ. Centre-Ville, Montréal, QC H3T 3J7, Canada.
| | | |
Collapse
|