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Glenister MA, Frese JWA, Elsegood MRJ, Canaj AB, Brechin EK, Redshaw C. Reaction of Ph 2C(X)(CO 2H) (X = OH, NH 2) with [VO(OR) 3] (R = Et, nPr): structure, magnetic susceptibility and ROP capability. Dalton Trans 2024; 53:5351-5355. [PMID: 38444301 DOI: 10.1039/d4dt00078a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Reaction of [VO(OR)3] (R = Et, nPr) with 2,2'-diphenylglycine afforded the alkoxide-bridged dimers {[VO(OR)(μ-OR)][Ph2C(NH2)(CO2)]}2, whereas use of benzilic acid, in the presence of alkali metals, afforded 16-membered metallocycles {V8(O)4M(OR)8[Ph2C(OH)(CO2)]12} (M = <1 Na, K). For the ring systems, magnetic susceptibility data is consistent with mixed-valence vanadium with an average oxidation state of 3.5. The dimer and ring systems are capable of the ring opening polymerisation (ROP) of ε-caprolactone under N2, air, or as melts affording mostly low to medium molecular weight cyclic and linear products.
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Affiliation(s)
- Mollie A Glenister
- Plastics Collaboratory, Chemistry, School of Natural Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Josef W A Frese
- Plastics Collaboratory, Chemistry, School of Natural Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Mark R J Elsegood
- Plastics Collaboratory, Chemistry, School of Natural Sciences, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Angelos B Canaj
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK
| | - Euan K Brechin
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK
| | - Carl Redshaw
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
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2
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Yolsal U, Shaw PJ, Lowy PA, Chambenahalli R, Garden JA. Exploiting Multimetallic Cooperativity in the Ring-Opening Polymerization of Cyclic Esters and Ethers. ACS Catal 2024; 14:1050-1074. [PMID: 38269042 PMCID: PMC10804381 DOI: 10.1021/acscatal.3c05103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 12/17/2023] [Accepted: 12/19/2023] [Indexed: 01/26/2024]
Abstract
The use of multimetallic complexes is a rapidly advancing route to enhance catalyst performance in the ring-opening polymerization of cyclic esters and ethers. Multimetallic catalysts often outperform their monometallic analogues in terms of reactivity and/or polymerization control, and these improvements are typically attributed to "multimetallic cooperativity". Yet the origins of multimetallic cooperativity often remain unclear. This review explores the key factors underpinning multimetallic cooperativity, including metal-metal distances, the flexibility, electronics and conformation of the ligand framework, and the coordination environment of the metal centers. Emerging trends are discussed to provide insights into why cooperativity occurs and how to harness cooperativity for the development of highly efficient multimetallic catalysts.
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Affiliation(s)
- Utku Yolsal
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Peter J. Shaw
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Phoebe A. Lowy
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Raju Chambenahalli
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Jennifer A. Garden
- School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
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3
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Hamurcu F, Özmen ÜÖ, Şentürk OS, Kaya K, Adem S, Erden BA, Celebioglu HU, Erden Y, Taslimi P. Biological Effects and Crystal X-Ray Study of Novel Schiff Base Containing Pentafluorophenyl Hydrazine: In Vitro and in Silico Studies. Chem Biodivers 2023; 20:e202301132. [PMID: 37743325 DOI: 10.1002/cbdv.202301132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 09/24/2023] [Accepted: 09/24/2023] [Indexed: 09/26/2023]
Abstract
A novel Schiff base namely 3,5-di-tert-butyl-6-((2-(perfluorophenyl)hydrazono)methyl)phenol was successfully synthesized and characterized using FT-IR and 1 H-NMR, 13 C-NMR, and 19 F-NMR. The crystal structure analysis of the Schiff base compound was also characterized with single crystal X-ray diffraction studies and supported the spectroscopic results. The cytotoxicity, anti-bacterial properties, and enzyme inhibition of the compound were also investigated. The molecular docking studies were performed in order to explain the interactions of the synthesized compound with target enzymes. The newly synthesized hydrazone derivative Schiff base compound showed high cellular toxicity on MCF-7 and PC-3 cells. Also, this compound caused low antibacterial effect on E. coli and S. aureus. Besides, the compound exhibited the inhibitory effect against pancreatic cholesterol esterase and carbonic anhydrase isoenzyme I, II with IC50 values 63, 99, and 188 μM, respectively. Consequently, it has been determined that the prepared Schiff base is an active compound in terms of cytotoxicity, enzyme inhibition, and anti-bacterial properties. These results provide preliminary information for some biological features of the compound and can play a major role in drug applications of the Schiff base compound.
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Affiliation(s)
- Fatma Hamurcu
- Bartin University, Faculty of Science, Department of Molecular Biology and Genetics, 74110, Bartin, Turkey
| | - Ümmühan Özdemir Özmen
- Gazi University, Faculty of Science, Department of Chemistry, Ankara, 06500, Ankara/, Turkey
| | - Ozan Sanlı Şentürk
- Istanbul Technical University, Faculty of Sciences, Department of Chemistry, 34467, Istanbul, Turkey
| | - Kerem Kaya
- Istanbul Technical University, Faculty of Sciences, Department of Chemistry, 34467, Istanbul, Turkey
| | - Sevki Adem
- Cankırı Karatekin University, Faculty of Science, Department of Chemistry, 06500, Cankırı, Turkey
| | - Büşra Aksoy Erden
- Bartin University, Central Research Laboratory Application and Research Center, 74110, Bartin, Turkey
| | - Hasan Ufuk Celebioglu
- Bartin University, Faculty of Science, Department of Biotechnology, 74110, Bartin, Turkey
| | - Yavuz Erden
- Bartin University, Faculty of Science, Department of Molecular Biology and Genetics, 74110, Bartin, Turkey
| | - Parham Taslimi
- Bartin University, Faculty of Science, Department of Biotechnology, 74110, Bartin, Turkey
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4
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Tsacheva I, Todorova Z, Momekova D, Momekov G, Koseva N. Pharmacological Activities of Schiff Bases and Their Derivatives with Low and High Molecular Phosphonates. Pharmaceuticals (Basel) 2023; 16:938. [PMID: 37513849 PMCID: PMC10386503 DOI: 10.3390/ph16070938] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/21/2023] [Accepted: 06/22/2023] [Indexed: 07/30/2023] Open
Abstract
This review paper is focused on the design of anthracene and furan-containing Schiff bases and their advanced properties as ligands in complex transition metal ions The paper also provides a brief overview on a variety of biological applications, namely, potent candidates with antibacterial and antifungal activity, antioxidant and chemosensing properties. These advantageous properties are enhanced upon metal complexing. The subject of the review has been extended with a brief discussion on reactivity of Schiff bases with hydrogen phosphonates and the preparation of low and high molecular phosphonates, as well as their application as pharmacological agents. This work will be of interest for scientists seeking new challenges in discovering advanced pharmacological active molecules gaining inspiration from the versatile families of imines and aminophosphonates.
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Affiliation(s)
- Ivelina Tsacheva
- Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, 1113 Sofia, Bulgaria
| | - Zornica Todorova
- Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, 1113 Sofia, Bulgaria
| | - Denitsa Momekova
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Georgi Momekov
- Department of Pharmacology, Pharmacotherapy and Toxicology, Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Neli Koseva
- Bulgarian Academy of Sciences, 1 "15 Noemvri" Str., 1040 Sofia, Bulgaria
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Wu LJ, Lee W, Kumar Ganta P, Chang YL, Chang YC, Chen HY. Multinuclear metal catalysts in ring-opening polymerization of ε‑caprolactone and lactide: Cooperative and electronic effects between metal centers. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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6
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Ni C, Pang Z, Qiao Y, Guo P, Ma X, Yang Z. Organoaluminum derived from Schiff bases: Synthesis, characterization and catalytic performance in hydroboration. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121199] [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]
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7
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Pu LM, Zhang T, La YT, Long HT, Xu WB, Dong WK. A study on two unusual heterohexanuclear [CuII4LnIII2] (LnIII = LaIII and CeIII) complexes with a N2O2- and O6-donor bis(salamo)-based ligand. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.110113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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8
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Chang CJ, Lee W, Liou YC, Chang YL, Lai YC, Ding S, Chen HY, Chen HY, Chang YC. Synergy Effect of Aluminum Complexes During the Ring-Opening Polymerization of ε-Caprolactone: Inductive Effects Between Dinuclear Metal Catalysts. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111651] [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]
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9
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Bonati FC, Secchi A, Cera G. Recent advances with calix[6]- and calix[8]arene organometallic catalysts. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Schiff base containing fluorouracil and its M(II) complexes: Synthesis, characterization, cytotoxic and antioxidant activities. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Ring Opening Polymerization of Lactides and Lactones by Multimetallic Titanium Complexes Derived from the Acids Ph2C(X)CO2H (X = OH, NH2). Catalysts 2022. [DOI: 10.3390/catal12090935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The reactions of the titanium alkoxide [Ti(OR)4] (R = Me, nPr, iPr, tBu) with the acids 2,2’-Ph2C(X)(CO2H), where X = OH and NH2, i.e., benzilic acid (2,2’-diphenylglycolic acid, L1H2), and 2,2’-diphenylglycine (L2H3), have been investigated. The variation of the reaction stoichiometry allows for the isolation of mono-, bi-, tri or tetra-metallic products, the structures of which have been determined by X-ray crystallography. The ability of the resulting complexes to act as catalysts for the ring opening polymerization (ROP) of ε-caprolactone (ε-CL) and r-lactide (r-LA) has been investigated. In the case of ε-CL, all catalysts except that derived from [Ti(OnPr)4] and L2H3, i.e., 7, exhibited an induction period of between 60 and 285 min, with 7 exhibiting the best performance (>99% conversion within 6 min). The PCL products are moderate- to high-molecular weight polymers. For r-LA, systems 1, 3, 4 and 7 afforded conversions of ca. 90% or more, with 4 exhibiting the fastest kinetics. The molecular weights for the PLA are somewhat higher than those of the PCL, with both cyclic and linear PLA products (end groups of OR/OH) identified. Comparative studies versus the [Ti(OR)4] starting materials were conducted, and although high conversions were achieved, the control was poor.
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12
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Xing T, Frese JWA, Derbyshire M, Glenister MA, Elsegood MRJ, Redshaw C. Trinuclear zinc calix[4]arenes: synthesis, structure, and ring opening polymerization studies. Dalton Trans 2022; 51:11776-11786. [PMID: 35860977 DOI: 10.1039/d2dt01496c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The trinuclear zinc calix[4]arene complexes [Zn3(O2CCH3)2(L(O)2(OMe)2)2·xMeCN (x = 7.5, 1; x = 6, 1'), [Zn3(O2CCH3)2(L(O)2(OnPr)2)2·5MeCN (2·5MeCN), [Zn3(OEt)2(L(O)2(OMe)2)2]·4MeCN (3·4MeCN), [Zn3(OEt)2(L(Opentyl)2)2]·4.5MeCN (4·4.5MeCN) and [Zn3(OH)2(L(O)2(On-pentyl)2]·8MeCN (5·8MeCN) have been isolated from reaction of [(ZnEt)2(L(O)2(OR)2)2] (L(OH)2(OR)2 = 1,3-dialkoxy-4-tert-butylcalix[4]arene; R = methyl, n-propyl or pentyl) and the reagents acetic acid, ethanol, and presumed adventitious water, respectively. Attempts to make 5via a controlled hydrolysis led only to the isolation of polymorphs of (L(OH)2(Opentyl)2·MeCN. Reaction of [Zn(C6F5)2] with L(OH)2(Opentyl)2, in the presence of K2CO3, led to the isolation of the complex [Zn6(L(On-pentyl))2(OH)3(C6F5)3(NCMe)3]·3MeCN (6·3MeCN). The molecular structures of 1-6 reveal they all contain a near linear (163 to 179°) Zn3 motif. In 1-5, a central tetrahedral Zn centre is flanked by trigonal bipyramidal Zn centres, whilst in 6, for the linear Zn3 unit, a central distorted octahedral zinc centre is flanked by trigonal planar and a tetrahedral zinc centres. Screening for the ring opening polymerization (ROP) of ε-caprolactone at 90 °C revealed that they are active with moderate to good conversion affording low to medium molecular weight products with at least two series of ions. For comparative studies, the trinuclear aminebis(phenolate) complex [Zn3(Oi-Pr)2L/] (L/ = n-propylamine-N,N-bis(2-methylene-4,6-di-tert-butylphenolate) I was prepared. Kinetics revealed the rate order I > 4 > 6 ≈ 2 ≈ 1 > 3.
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Affiliation(s)
- Tian Xing
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Josef W A Frese
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Max Derbyshire
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Mollie A Glenister
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Mark R J Elsegood
- Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
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13
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Iron complexes of [2+2] and [6+6] Schiff-base macrocycles derived from 2,2′-oxydianiline and their applications. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109376] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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14
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Kosuru SR, Chang YL, Chen PY, Lee W, Lai YC, Ding S, Chen HY, Chen HY, Chang YC. Ring-Opening Polymerization of ε-Caprolactone by Using Aluminum Complexes Bearing Aryl Thioether Phenolates: Labile Thioether Chelation. Inorg Chem 2022; 61:3997-4008. [PMID: 35020371 DOI: 10.1021/acs.inorgchem.1c03683] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, aluminum complexes bearing ferrocene-based and arylthiomethylphenolate ligands were synthesized, and their catalytic activity for ε-caprolactone (CL) polymerization was investigated. The catalytic activity of the reduced form of Al complexes was higher than that of the oxidized form. The CL polymerization rate of the reduced form fcO2AlMe (75 min, conversion = 100%) was higher than that of the oxidized form fcoxO2AlMe (4320 min, conversion = 45%), and the CL polymerization rate of fc(OAlMe2)2 (40 min, conversion = 100%) was higher than that of fcox(OAlMe2)2 (60 min, conversion = 97%). Electron deficiency substituents on phenolate decreased the catalytic activity of Al complexes bearing arylthiomethylphenolate ligands. Density functional theory calculations revealed that thioether coordination stabilized the transition state (TS1) and that the oxidized form fcox(OAlMe2)2 exhibited weaker thioether coordination and higher activation energy in TS1 compared with those of the reduced form fcO2AlMe. In addition, our study determined that the thioether group is a suitable chelating group for Al catalysts in CL polymerization due to its labile nature.
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Affiliation(s)
- Someswara Rao Kosuru
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC
| | - Yu-Lun Chang
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC
| | - Po-Yu Chen
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC
| | - Wei Lee
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC
| | - Yi-Chun Lai
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC
| | - Shangwu Ding
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC.,Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, ROC
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC.,Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, ROC.,Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan, ROC
| | - Hsing-Yin Chen
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan 80708, ROC
| | - Yung-Chi Chang
- Leiden Institute of Chemistry, Faculty of Science, Leiden University, 2300 RA Leiden, The Netherlands
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15
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Dordahan F, Schaper F. Lactide polymerization using a sterically encumbered, flexible zinc complex. CAN J CHEM 2021. [DOI: 10.1139/cjc-2021-0239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
4-(tert-Butyl)-2-trityl-6-(di-(2-picolyl)amine)phenol, LH, was prepared from paraformaldehyde, 4-(tert-butyl)-2-tritylphenol and di-(2-picolyl)amine. Reaction with Zn(N(SiMe3)2)2 gave LZnN(SiMe3)2. The complex was shown by X-ray diffraction study, variable
temperature NMR and DFT calculations to coordinate only one pyridine ligand, which allows for fast and facile complex isomerisation. LZnN(SiMe3)2 was active in rac-lactide polymerization, but in contrast to previous complexes of this type did not show any evidence for isotactic monomer enchainment via a catalytic-site mediated chain-end control mechanism. Addition of alcohol led to increased activity, but the complex was unstable in the presence of free alcohol.
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Affiliation(s)
- Fatemeh Dordahan
- Université de Montréal, 5622, Chemistry, Montreal, Quebec, Canada
| | - Frank Schaper
- Université de Montréal, 5622, Chemistry, Montreal, Quebec, Canada,
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16
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Synthesis and characterization of metal-mercaptoacetate hybrids and its application towards ring-opening polymerization of ε-caprolactone: a comparative study. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03939-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Xing T, Jiang C, Elsegood MRJ, Redshaw C. Lithiated Calix[ n]arenes ( n = 6 or 8): Synthesis, Structures, and Use in the Ring-Opening Polymerization of Cyclic Esters. Inorg Chem 2021; 60:15543-15556. [PMID: 34596403 DOI: 10.1021/acs.inorgchem.1c02192] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A variety of lithiated calix[n]arenes, for which n = 6 or 8, have been isolated, structurally characterized, and evaluated as catalysts for the ring-opening polymerization (ROP) of the cyclic esters ε-caprolactone (ε-CL), δ-valerolactone (δ-VL), and rac-lactide (r-LA). In particular, interaction of p-tert-butylcalix[6]areneH6 (L6H6) with LiOtBu in THF led to the isolation of [Li14(L6H)2(CO3)2(THF)6(OH2)6]·14THF (1·14THF), the core of which has a chain of five Li2O2 diamonds. Similar use of p-tert-butylcalix[8]areneH8 (L8H8) afforded [Li10(L8)(OH)2(THF)8]·7THF (2·7THF), where the core is composed of a six-rung Li-O ladder. Use of debutylated calix[8]areneH8 (deBuL8H8) led to an elongated dimer [Li18(deBuL8)2(OtBu)2(THF)14]·4THF (3·4THF) in which the calix[8]arenes possess a wavelike conformation forming bridges to link three separate LixOy clusters (where x and y = 6, ignoring the THF donor oxygens). Interaction of L8H8 with LiOH·H2O afforded [Li4(L8H4)(OH2)4(THF)6]·5.5THF (4·5.5THF), where intramolecular H-bond interactions involving Li, O, and H construct a cage in the core of the structure with six- and eight-membered rings. Lastly, addition of Me3Al to the solution generated from L8H8 and LiOtBu led to the isolation of [(AlMe2)2Li20(L8H2)2(OH2)4(O2-)4(OH)2(NCMe)12]·10MeCN (5·10MeCN) in which Li, O, Al, and N centers build a polyhedral core. These complexes have been screened for their potential to act as precatalysts in the ring-opening polymerization (ROP) of ε-CL, δ-VL, and r-LA. For the ROP of ε-CL, δ-VL, and r-LA, systems 1-4 exhibited moderate activity at 130 °C over 8 h. In the case of ROP using the mixed-metal (Li/Al) system 5, better conversions and high molecular weight polymers were achieved. In the case of the ROP of ω-pentadecalactone (ω-PDL), the systems proved to be inactive under the conditions employed herein.
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Affiliation(s)
- Tian Xing
- Plastics Collaboratory, Department of Chemistry, University of Hull, Hull HU6 7RX, U.K
| | - Chengying Jiang
- Chemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K
| | - Mark R J Elsegood
- Chemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, Hull HU6 7RX, U.K
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18
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Observation of a 3-in-1 Russian-doll-like Complex in Solution. Chem Res Chin Univ 2021. [DOI: 10.1007/s40242-021-1146-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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Kosuru SR, Lai FJ, Chang YL, Li CY, Lai YC, Ding S, Wu KH, Chen HY, Lo YH. Collaboration between Trinuclear Aluminum Complexes Bearing Bipyrazoles in the Ring-Opening Polymerization of ε-Caprolactone. Inorg Chem 2021; 60:10535-10549. [PMID: 34232620 DOI: 10.1021/acs.inorgchem.1c01192] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Trinuclear aluminum complexes bearing bipyrazoles were synthesized, and their catalytic activity for ε-caprolactone (CL) polymerization was investigated. DBu2Al3Me5 exhibited higher catalytic activity than did the dinuclear aluminum complex LBu2Al2Me4 (16 times as high for CL polymerization; [CL]:[DBu2Al3Me5]:[BnOH] = 100:0.5:5, [DBu2Al3Me5] = 10 mM, conversion 93% after 18 min at room temperature). Density functional theory calculations revealed a polymerization mechanism in which CL first approached the central Al atom and then moved to an external Al. The coordinated CL ring was opened because the repulsion of two tert-butyl groups on the ligands pushed an alkoxide initiator on an external Al to initiate CL. In these trinuclear Al catalysts, the central Al plays a role in monomer capture and then collaborates with the external Al to activate CL, accelerating polymerization.
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Affiliation(s)
- Someswara Rao Kosuru
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Feng-Jie Lai
- Department of Dermatology, Chi Mei Medical Center, Tainan, Taiwan, Republic of China.,Center for General Education, Southern Taiwan University of Science and Technology, Tainan, Taiwan, Republic of China
| | - Yu-Lun Chang
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Chen-Yu Li
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Yi-Chun Lai
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China
| | - Shangwu Ding
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China.,Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
| | - Kuo-Hui Wu
- Department of Chemistry, National Central University, Taoyuan 32001, Taiwan, Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, Republic of China.,Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China.,Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan, Republic of China
| | - Yung-Han Lo
- Department of Chemistry, Faculty of Science and Technology, Keio University, Minato City 108-8345, Tokyo, Japan
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20
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Wang K, Prior TJ, Hughes DL, Arbaoui A, Redshaw C. Coordination chemistry of [2 + 2] Schiff-base macrocycles derived from the dianilines [(2-NH 2C 6H 4) 2X] (X = CH 2CH 2, O): structural studies and ROP capability towards cyclic esters. Dalton Trans 2021; 50:8057-8069. [PMID: 34018513 DOI: 10.1039/d1dt00711d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Reaction of the [2 + 2] Schiff-base macrocycles {[2-(OH)-5-(R)-C6H2-1,3-(CH)2][CH2CH2(2-C6H4N)2]}2 (R = Me, L1H2; tBu, L2H2) with FeBr2 afforded the complexes [FeBr(L1H2)]2[(FeBr3)2O]·2MeCN (1·2MeCN), [FeBr(L2H2)][X] (X = 0.5(FeBr3)2O, 2·0.5MeCN, X = Br, 3·5.5MeCN), respectively. Reaction of L2H2 with [KFe(OtBu)3(THF)] (formed in situ from FeBr2 and KOtBu), following work-up, led to the isolation of the complex [Fe(L2)(L2H)]·3MeCN (4·3MeCN), whilst with [CuBr2] afforded [CuBr(L2H2)][CuBr2]·2MeCN (5·2MeCN). Attempts to form mixed Co/Ti species by reaction of [CoBrL2][CoBr3(NCMe)] with TiCl4 resulted in [L2H4][CoBr4]·2MeCN (6·2MeCN). Use of the related oxy-bridged Schiff-base macrocycles {[2-(OH)-5-(R)-C6H2-1,3-(CH)2][O(2-C6H4N)2]}2 (R = Me, L3H2; tBu, L4H2) with CoBr2 led to the isolation of the complexes [(CoBr)2(L3)]·2C3H6O (7·2C3H6O), [Co(NCMe)2(L4H2)][CoBr4]·5MeCN (8·5MeCN), [Co(NCMe)6][CoBr3(MeCN)]2·2MeCN (9·2MeCN). For comparative structural/polymerisation studies, the complexes {CoBr(NCMe)L5}2·2MeCN (10·2MeCN) and [Co(NCMe)2L5]2[CoBr3(NCMe)]2 (11), [FeBr(NCMe)L5]2·2MeCN (12·2MeCN) where L5H = 2,6-(CHO)2-4-tBu-C6H2OH, as well as the chelate-free salt [Fe(NCMe)6][FeBr3OFeBr3] (13) have been isolated and structurally characterized. The ability of these complexes to act as catalysts for the ring opening polymerisation (ROP) of ε-caprolactone (ε-CL) and δ-valerolactone (δ-VL) was investigated, as well as co-polymerisation of ε-CL with rac-lactide (r-LA) and vice versa.
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Affiliation(s)
- Kuiyuan Wang
- Plastics Collaboratory, Department of Chemistry, University of Hull, HU6 7RX, UK.
| | - Timothy J Prior
- Plastics Collaboratory, Department of Chemistry, University of Hull, HU6 7RX, UK.
| | - David L Hughes
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK
| | | | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, HU6 7RX, UK.
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21
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Ring-Opening Copolymerization of Cyclohexene Oxide and Cyclic Anhydrides Catalyzed by Bimetallic Scorpionate Zinc Catalysts. Polymers (Basel) 2021; 13:polym13101651. [PMID: 34069623 PMCID: PMC8161297 DOI: 10.3390/polym13101651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 11/24/2022] Open
Abstract
The catalytic activity and high selectivity reported by bimetallic heteroscorpionate acetate zinc complexes in ring-opening copolymerization (ROCOP) reactions involving CO2 as substrate encouraged us to expand their use as catalysts for ROCOP of cyclohexene oxide (CHO) and cyclic anhydrides. Among the catalysts tested for the ROCOP of CHO and phthalic anhydride at different reaction conditions, the most active catalytic system was the combination of complex 3 with bis(triphenylphosphine)iminium as cocatalyst in toluene at 80 °C. Once the optimal catalytic system was determined, the scope in terms of other cyclic anhydrides was broadened. The catalytic system was capable of copolymerizing selectively and efficiently CHO with phthalic, maleic, succinic and naphthalic anhydrides to afford the corresponding polyester materials. The polyesters obtained were characterized by spectroscopic, spectrometric, and calorimetric techniques. Finally, the reaction mechanism of the catalytic system was proposed based on stoichiometric reactions.
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22
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Ring-opening polymerization of L-lactide by using sodium complexes bearing amide as catalysts in high polar solvent. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-020-03240-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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23
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Alshamrani AFA, Santoro O, Prior TJ, Alamri MA, Stasiuk GJ, Elsegood MRJ, Redshaw C. Scandium calix[ n]arenes ( n = 4, 6, 8): structural, cytotoxicity and ring opening polymerization studies. Dalton Trans 2021; 50:8302-8306. [PMID: 34100050 DOI: 10.1039/d1dt01330k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interaction of [Sc(OR)3] (R = iPr or triflate) with p-tert-butylcalix[n]arenes, where n = 4, 6, or 8, affords a number of intriguing structural motifs, which are relatively non-toxic (cytotoxicity evaluated against cell lines HCT116 and HT-29) and a number were capable of the ring opening polymerization (ROP) of cyclohexene oxide.
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Affiliation(s)
- Abdullah Fahad A Alshamrani
- Plastics Collaboratory, Department of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, UK. and Department of Diagnostic Radiology Technology, College of Applied Medical Sciences, Taibah University, Madina, Saudi Arabia
| | - Orlando Santoro
- Plastics Collaboratory, Department of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Timothy J Prior
- Plastics Collaboratory, Department of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Mohammed A Alamri
- Plastics Collaboratory, Department of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Graeme J Stasiuk
- Department of Imaging Chemistry and Biology, School of Biomedical Engineering and Imaging, King's College London, London, SE1 7EH, UK
| | - Mark R J Elsegood
- Chemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
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24
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Xing T, Prior TJ, Elsegood MRJ, Semikolenova NV, Soshnikov IE, Bryliakov K, Chen K, Redshaw C. Vanadium complexes derived from oxacalix[6]arenes: structural studies and use in the ring opening homo-/co-polymerization of ε-caprolactone/δ-valerolactone and ethylene polymerization. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01979h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Oxacalix[6]arene vanadium complexes have been employed for the ROP of cyclic esters and ethylene polymerization.
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Affiliation(s)
- Tian Xing
- Plastics Collaboratory
- Department of Chemistry
- University of Hull
- Hull
- UK
| | - Timothy J. Prior
- Plastics Collaboratory
- Department of Chemistry
- University of Hull
- Hull
- UK
| | | | | | - Igor E. Soshnikov
- Boreskov Institute of Catalysis
- Novosibirsk 630090
- Russian Federation
- Novosibirsk State University
- Novosibirsk 630090
| | - Konstantin Bryliakov
- Boreskov Institute of Catalysis
- Novosibirsk 630090
- Russian Federation
- Novosibirsk State University
- Novosibirsk 630090
| | - Kai Chen
- Plastics Collaboratory
- Department of Chemistry
- University of Hull
- Hull
- UK
| | - Carl Redshaw
- Plastics Collaboratory
- Department of Chemistry
- University of Hull
- Hull
- UK
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25
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Wang TF, Kosuru SR, Yu SC, Chang YC, Lai HY, Chang YL, Wu KH, Ding S, Chen HY. Use of pyrazoles as ligands greatly enhances the catalytic activity of titanium iso-propoxide for the ring-opening polymerization of l-lactide: a cooperation effect. RSC Adv 2020; 10:40690-40696. [PMID: 35519227 PMCID: PMC9057761 DOI: 10.1039/d0ra07824g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Accepted: 10/22/2020] [Indexed: 11/21/2022] Open
Abstract
Using TiOiPr4 with a pyrazole ligand for one-pot LA polymerization improved catalytic activity compared with using TiOiPr4 only. At 60 °C, TiOiPr4 with furPz exhibited a higher catalytic activity (approximately 3-fold) than TiOiPr4. At room temperature, TiOiPr4 with BuPz exhibited a higher catalytic activity (approximately 17-fold) than TiOiPr4. High molecular mass PLA (M nGPC = 51 100, and Đ = 1.10) could be produced by using TiOiPr4 with furPz in melt polymerization ([TiOiPr4] : [furPz] = 1000 : 1 : 1 at 100 °C, 240 min). The crystal structure of MePz2Ti2OiPr7 revealed the cooperative activation between two Ti atoms during LA polymerization.
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Affiliation(s)
- Tzu-Fang Wang
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585
| | - Someswara Rao Kosuru
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585
| | - Shu-Chun Yu
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585
| | - Yung-Chi Chang
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585
| | - Hsin-Yu Lai
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585
| | - Yu-Lun Chang
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585
| | - Kuo-Hui Wu
- Department of Chemistry, Graduate School of Science, The University of Tokyo Tokyo 113-0033 Japan.,Department of Chemistry, Tamkang University Tamsui 251 Taiwan Republic of China
| | - Shangwu Ding
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585.,Department of Chemistry, National Sun Yat-sen University Kaohsiung Taiwan 80424 Republic of China
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Drug Development and Value Creation Research Center, Kaohsiung Medical University Kaohsiung Taiwan 80708 Republic of China +886-7-3125339 +886-7-3121101 ext. 2585.,Department of Chemistry, National Sun Yat-sen University Kaohsiung Taiwan 80424 Republic of China.,Department of Medical Research, Kaohsiung Medical University Hospital Kaohsiung 80708 Taiwan Republic of China
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26
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Santoro O, Elsegood MRJ, Bedwell EV, Pryce JA, Redshaw C. INSIGHTS into the structures adopted by titanocalix[6 and 8]arenes and their use in the ring opening polymerization of cyclic esters. Dalton Trans 2020; 49:11978-11996. [PMID: 32812994 DOI: 10.1039/d0dt02130j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interaction of p-tert-butylcalix[6]areneH6, L1H6, with [TiCl4] afforded the complex [Ti2Cl3(MeCN)2(OH2)(L1H)][Ti2Cl3(MeCN)3(L1H)]·4.5MeCN (1·4.5MeCN), in which two pseudo-octahedral titanium centres are bound to one calix[6]arene. A similar reaction but employing THF resulted in the THF ring-opened product [Ti4Cl2(μ3-O)2(NCMe)2(L)2(O(CH2)4Cl)2]·4MeCN (2·4MeCN), where LH4 = p-tert-butylcalix[4]areneH4. Interaction of L1H6 with [TiF4] (3 equiv.) led, after work-up, to the complex [(TiF)2(μ-F)L1H]2·6.5MeCN (3·6.5MeCN). Treatment of p-tert-butylcalix[8]areneH8, L2H8, with [TiCl4] led to the isolation of the complex [(TiCl)2(TiClNCMe)2(μ3-O)2(L2)]·1.5MeCN (4·1.5MeCN). From a similar reaction, a co-crystallized complex [Ti4O2Cl4(MeCN)2(L2)][Ti3Cl6(MeCN)5(OH2)(L2H2)]·H2O·11MeCN (5·H2O 11MeCN) was isolated. Extension of the L2H8 chemistry to [TiBr4] afforded, depending on the stoichiometry, the complexes [(TiBr)2(TiBrNCMe)2(μ3-O)2(L2)]·6MeCN (6·6MeCN) or [[Ti(NCMe)2Br]2[Ti(O)Br2(NCMe)](L2)]·7.5MeCN (7·7.5MeCN), whilst use of [TiF4] afforded complexes containing Ca2+ and Na+, thought to originate from drying agents, namely [Ti8CaF20(OH2)Na2(MeCN)4(L2)2]·14MeCN (8·14MeCN), [Na(MeCN)2][Ti8CaF20NaO16(L2)2]·7MeCN (9·7MeCN) or [Na]6[Ti8F20Na(MeCN)2(L2)][Ti8F20Na(MeCN)0.5(L2)]·15.5(C2H3N) (10·15.5MeCN). In the case of [TiI4], the ladder [(TiI)2(TiINCMe)2(μ3-O)2(L2)]·7.25CH2Cl2 (11·7.25CH2Cl2) was isolated. These complexes have been screened for their potential to act as catalysts in the ring opening polymerization (ROP) of ε-caprolactone (ε-CL), δ-valerolactone (δ-VL) and rac-lactide (r-LA), both in air and N2. For ε-CL and δ-VL, moderate activity at 130 °C over 24 h was observed for 1, 9 and 11; for r-LA, only 1 exhibited reasonable activity. In the case of the co-polymerization of ε-CL with δ-VL, the complexes 1 and 11 afforded reasonable conversions and low molecular weight polymers, whilst 4, 6, and 9 were less effective. None of the complexes proved to be active in the co-polymerization of ε-CL and r-LA under the conditions employed herein.
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Affiliation(s)
- Orlando Santoro
- Plastics Collaboratory, Department of Chemistry and Biochemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
| | - Mark R J Elsegood
- Chemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
| | - Elizabeth V Bedwell
- Chemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
| | - Jake A Pryce
- Chemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry and Biochemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, UK.
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27
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Comparison of L-lactide polymerization by using magnesium complexes bearing 2-(arylideneamino)phenolate and 2-((arylimino)methyl)phenolate ligands. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109864] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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28
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de la Cruz-Martínez F, Martínez de Sarasa Buchaca M, Martínez J, Tejeda J, Fernández-Baeza J, Alonso-Moreno C, Rodríguez AM, Castro-Osma JA, Lara-Sánchez A. Bimetallic Zinc Catalysts for Ring-Opening Copolymerization Processes. Inorg Chem 2020; 59:8412-8423. [PMID: 32452688 DOI: 10.1021/acs.inorgchem.0c00835] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Novel bimetallic zinc acetate complexes supported by heteroscorpionate ligands have been developed for the ring-opening copolymerization of cyclohexene oxide and CO2 and the terpolymerization of cyclohexene oxide, phthalic anhydride, and CO2. Heteroscorpionate ligands precursors L1-L3 were reacted with two equivalents of zinc acetate to afford the dinuclear zinc complexes [{Zn(κ3-bpzappe)}(μ-O2CCH3)3-{Zn(HO2CCH3)}] (1), [{Zn(κ3-bpzbdmape)}(μ-O2CCH3)3-{Zn(HO2CCH3)}] (2), and [{Zn(κ3-bpzbdeape)}(μ-O2CCH3)3{Zn(HO2CCH3)}] (3) in excellent yields. The molecular structure of these compounds was determined spectroscopically and confirmed by X-ray diffraction analysis. Zinc acetate complexes 1-3 were screened as catalysts for the copolymerization of cyclohexene oxide and CO2 to produce poly(cyclohexene)carbonate, and complex 3 was found to be the most active catalyst for this process in the absence of a cocatalyst. Furthermore, the terpolymerization of cyclohexene oxide, phthalic anhydride, and CO2 was studied using the combination of complex 3 and 4-dimethylaminopyridine as catalyst system yielding the corresponding polyester-polycarbonate materials.
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Affiliation(s)
- Felipe de la Cruz-Martínez
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain
| | - Marc Martínez de Sarasa Buchaca
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain
| | - Javier Martínez
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain.,Laboratorio de Quı́mica Inorgánica, Facultad de Quı́mica, Universidad Católica de Chile Casilla 306, Santiago-22 6094411, Chile
| | - Juan Tejeda
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain
| | - Juan Fernández-Baeza
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain
| | - Carlos Alonso-Moreno
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Farmacia, Universidad de Castilla-La Mancha, 02071-Albacete, Spain
| | - Ana M Rodríguez
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain
| | - José A Castro-Osma
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Farmacia, Universidad de Castilla-La Mancha, 02071-Albacete, Spain
| | - Agustín Lara-Sánchez
- Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain
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29
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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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30
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Ahmed AAM, Mekky AEM, Elwahy AHM, Sanad SMH. Facile synthesis and characterization of novel benzo-fused macrocyclic dicarbonitriles and pyrazolo-fused macrocycles containing thiazole subunits. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2019.1689269] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Ahmed A. M. Ahmed
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
- Preparatory Year Deanship, Jouf University, Sakaka, Kingdom of Saudi Arabia
| | - Ahmed E. M. Mekky
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
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31
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Kayan A. Recent Studies on Single Site Metal Alkoxide Complexes as Catalysts for Ring Opening Polymerization of Cyclic Compounds. CATALYSIS SURVEYS FROM ASIA 2020. [DOI: 10.1007/s10563-019-09291-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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32
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Xiao L, Zhao Y, Qiao S, Sun Z, Santoro O, Redshaw C. Synthesis and structures of mono- and di-nuclear aluminium and zinc complexes bearing α-diimine and related ligands, and their use in the ring opening polymerization of cyclic esters. Dalton Trans 2020; 49:1456-1472. [DOI: 10.1039/c9dt04332b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multi-metallic complexes (of Al, Zn) derived from imine-based ligands effectively operate as catalysts for the ring opening polymerization (ROP) of ε-caprolactone (ε-CL), δ-valerolactone (δ-VL) and co-polymerization thereof.
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Affiliation(s)
- Lin Xiao
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
| | - Yanxia Zhao
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
| | - Sijie Qiao
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
| | - Ziyue Sun
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
| | - Orlando Santoro
- Department of Chemistry & Biochemistry
- The University of Hull
- Hull
- UK
| | - Carl Redshaw
- College of Chemistry and Material Science
- Northwest University
- 710069 Xi'an
- China
- Department of Chemistry & Biochemistry
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33
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Improvement in zinc complexes bearing Schiff base in ring-opening polymerization of ε-caprolactone: A five-membered ring system. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121812] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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34
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Wang K, Prior TJ, Redshaw C. Turning on ROP activity in a bimetallic Co/Zn complex supported by a [2+2] Schiff-base macrocycle. Chem Commun (Camb) 2019; 55:11279-11282. [PMID: 31475709 DOI: 10.1039/c9cc04494a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Homo-dinuclear Co and Zn complexes derived from the macrocycle LH2, {[2-(OH)-5-(R)-C6H2-1,3-(CH)2][CH2CH2(2-C6H4N)2]}2 (R = Me, tBu), revealed near inactivity for the ring opening polymerization (ROP) of the cyclic esters δ-valerolactone (δ-VL) and ε-caprolactone (ε-CL). By contrast, the hetero-bimetallic complexes [LCo(NCMe)(μ-Br)ZnBr]·nMeCN (n = 3 or 3.25) were found to be efficient catalysts for the ROP of ε-CL and δ-VL.
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Affiliation(s)
- Kuiyuan Wang
- Department of Chemistry & Biochemistry, University of Hull, Hull, HU6 7RX, UK.
| | - Timothy J Prior
- Department of Chemistry & Biochemistry, University of Hull, Hull, HU6 7RX, UK.
| | - Carl Redshaw
- Department of Chemistry & Biochemistry, University of Hull, Hull, HU6 7RX, UK.
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Wei C, Han B, Zheng D, Zheng Q, Liu S, Li Z. Aluminum Complexes Bearing Bidentate Amido–Phosphine Ligands for Ring-Opening Polymerization of ε-Caprolactone: Steric Effect on Coordination Chemistry and Reactivity. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00502] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Chuanzhi Wei
- Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department; College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
| | - Binghao Han
- Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department; College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
| | - Dejuan Zheng
- Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department; College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
| | - Quande Zheng
- Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department; College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
| | - Shaofeng Liu
- Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department; College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
| | - Zhibo Li
- Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department; College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, People’s Republic of China
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Lu WY, Wu KH, Chen HY, Lin CC. Synthesis and Characterization of N,N,O-Tridentate Aminophenolate Zinc Complexes and Their Catalysis in the Ring-Opening Polymerization of Lactides. Front Chem 2019; 7:189. [PMID: 31024885 PMCID: PMC6459900 DOI: 10.3389/fchem.2019.00189] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Accepted: 03/12/2019] [Indexed: 12/14/2022] Open
Abstract
A series of aminophenolate ligands with various pendant groups and associated ethyl Zn complexes were synthesized and studied as catalysts for the ring-opening polymerization (ROP) of lactides (LAs). The thiophenylmethyl group (L4ZnEt) increased the catalytic activity more than the benzyl group (L1ZnEt) did, and 2-fluorobenzyl (L3ZnEt) and 2-methoxybenzyl (L2ZnEt) groups had the opposite effect. In addition, the LA polymerization mechanism proved by Nuclear Magnetic Resonance and Density Function Theory was that LA was attracted by H···O bond of an α-hydrogen of the LA molecule and the phenoxyl oxygen of the catalyst. After the dissociation of amino group from the Zn atom, the benzyl alcohol initiated LA without replacing the ethyl group of Zn complex. It is the first case where the ethyl group is regarded as a ligand and cannot be replaced by benzyl alcohol, and this information is very important for the mechanism study of ROP.
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Affiliation(s)
- Wei-Yi Lu
- Department of Chemistry, National Chung Hsing University, Taichung, Taiwan
| | - Kuo-Hui Wu
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Chu-Chieh Lin
- Department of Chemistry, National Chung Hsing University, Taichung, Taiwan
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Cheng FY, Tsai CY, Huang BH, Lu KY, Lin CC, Ko BT. Mono- and dinuclear copper complexes coordinated on NNO-tridentate Schiff-base derivatives for copolymerization of cyclohexene oxide and cyclic anhydrides. Dalton Trans 2019; 48:4667-4676. [PMID: 30895996 DOI: 10.1039/c9dt00471h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A series of bimetallic penta-coordinated copper complexes [Ln2Cu2(OAc)2] (1, 3-7), a mononuclear tetra-coordinated copper complex [LnCu(OAc)] (8 and 9), and a penta-coordinated copper complex [L2Cu(OAc)(H2O)] (10) were prepared by the reaction of Cu(OAc)2·H2O with a variety of NNO-tridentate Schiff-base ligands (L1-H-L9-H) in refluxing 95% ethanol, respectively. However, a dinuclear copper complex [(L2)2Cu2(OAc)2] (2) can be obtained from the treatment of L2-H with a stoichiometric amount of anhydrous Cu(OAc)2 in refluxing absolute EtOH under a dry nitrogen atmosphere. All of these copper complexes are active for the alternating copolymerization of cyclohexene oxide and cyclic anhydride, affording polyesters with moderate polydispersity. In particular, dinuclear copper complexes 1 and 2 performed satisfactorily to produce polyesters with controllable molecular weights and high ester linkages. This is the first example of well-defined copper acetate catalysts active for the copolymerization of cyclohexene oxide-phthalic anhydride or cyclohexene oxide-succinic anhydride which may be advantageous in terms of obviating the use of co-catalysts and low cost as well as an effective copolymerization for the formation of biodegradable polyesters in a controlled fashion.
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Affiliation(s)
- Fu-Yin Cheng
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.
| | - Chen-Yen Tsai
- Department of Chemistry, Chinese Culture University, Taipei 111, Taiwan.
| | - Bor-Hunn Huang
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.
| | - Kuan-Yeh Lu
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.
| | - Chu-Chieh Lin
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.
| | - Bao-Tsan Ko
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.
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Pankhurst JR, Paul S, Zhu Y, Williams CK, Love JB. Polynuclear alkoxy-zinc complexes of bowl-shaped macrocycles and their use in the copolymerisation of cyclohexene oxide and CO 2. Dalton Trans 2019; 48:4887-4893. [PMID: 30896006 DOI: 10.1039/c9dt00595a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The reactions between alcohols and the tetranuclear ethyl-Zn complexes of an ortho-phenylene-bridged polypyrrole macrocycle, Zn4Et4(L1) 1 and the related anthracenyl-bridged macrocyclic complex, Zn4Et4(THF)4(L2) 2 have been studied. With long-chain alcohols such as n-hexanol, the clean formation of the tetranuclear hexoxide complex Zn4(OC6H13)4(L1) 3 occurs. In contrast, the use of shorter-chain alcohols such as i-propanol results in the trinuclear complex Zn3(μ2-OiPr)2(μ3-OiPr)(HL1) 4 that arises from demetalation; this complex was characterised by X-ray crystallography. The clean formation of these polynuclear zinc clusters allowed a study of their use as catalysts in the ring-opening copolymerisation (ROCOP) reaction between cyclohexene oxide and CO2. In situ reactions involving the pre-catalyst 1 and n-hexanol formed the desired polymer with the best selectivity for polycarbonate (90%) at 30 atm CO2, whilst the activity and performance of pre-catalyst 2 was poor in comparison.
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Affiliation(s)
- James R Pankhurst
- EaStCHEM School of Chemistry, The University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK.
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Li P, Xi Y, Li L, Li H, Sun WH, Lei M. A DFT study on ring-opening polymerization of ε-caprolactone initiated by Mg and Al complexes. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.02.033] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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40
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Wang X, Zhao KQ, Elsegood MRJ, Redshaw C. Molybdocalix[4]arene N,O-Schiff-base ligands. Supramol Chem 2017. [DOI: 10.1080/10610278.2017.1403608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Xue Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, China
| | - Ke-Qing Zhao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, China
| | | | - Carl Redshaw
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, China
- Department of Chemistry, School of Mathematics & Physical Sciences, University of Hull, Hull, UK
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