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Navarro M, Sobrino S, Fernández I, Lara-Sánchez A, Garcés A, Sánchez-Barba LF. Exploring enantiopure zinc-scorpionates as catalysts for the preparation of polylactides, cyclic carbonates, and polycarbonates. Dalton Trans 2024; 53:13933-13949. [PMID: 39099454 DOI: 10.1039/d4dt01526f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/06/2024]
Abstract
New and simple ligand design strategies for the preparation of versatile metal-based catalysts capable of operating under greener and eco-friendly conditions in several industrially attractive processes are in high demand for society development. We present the first nucleophilic addition of an organolithium to ketenimines which incorporates a stereogenic centre in an N-donor atom to prepare new enantiopure NNN-donor scorpionates. We have also verified its potential utility as a valuable scaffold for chirality induction through the preparation of inexpensive, non-toxic and asymmetric zinc complexes. The pro-ligands and the corresponding zinc-based complexes have been characterized by X-ray diffraction studies. DFT studies were carried out to rationalize the different complexation abilities of these pro-ligands. These complexes have proved to act as highly efficient catalysts for a variety of sustainable bioresourced processes that are industrially attractive, with a wide substrate scope. Thus, complex 7 behaves as a highly efficient initiator for the well-behaved living ring-opening polymerization (ROP) of rac-lactide under very mild conditions. The PLA materials produced exhibited enhanced levels of isoselectivity, comparable to the highest value reported so far for zinc-based catalysts (Pi = 0.88). In addition, the combination of 7 with onium halide salts functioned as a very active and selective catalyst for CO2 fixation into five-membered cyclic carbonates through the cycloaddition of CO2 into epoxides under very mild and solvent-free conditions, reaching very good to excellent conversions (TOF = 227 h-1). Furthermore, this bicomponent system exhibits a broad substrate scope and functional group tolerance, including mono- and di-substituted epoxides, as well as the very challenging bio-renewable tri-substituted terpene-derived cis/trans-limonene oxide, whose reaction proceeds with high stereoselectivity. Finally, complex 7 also achieved high activity and selectivity as a one-component initiator for the synthesis of poly(cyclohexene carbonate)s via ring-opening copolymerization (ROCOP) of cyclohexene oxide and CO2 under very soft conditions, affording materials with narrow dispersity values.
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Affiliation(s)
- Marta Navarro
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
- Universidad Rey Juan Carlos, Departamento de Biología y Geología, Física y Química Inorgánica, Móstoles-28933-Madrid, Spain.
| | - Sonia Sobrino
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
| | - Israel Fernández
- Universidad Complutense de Madrid. Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias Químicas, 28040, Madrid, Spain
| | - Agustín Lara-Sánchez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Campus Universitario, 13071-Ciudad Real, Spain
| | - Andrés Garcés
- Universidad Rey Juan Carlos, Departamento de Biología y Geología, Física y Química Inorgánica, Móstoles-28933-Madrid, Spain.
| | - Luis F Sánchez-Barba
- Universidad Rey Juan Carlos, Departamento de Biología y Geología, Física y Química Inorgánica, Móstoles-28933-Madrid, Spain.
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Navarro M, González-Lizana D, Sánchez-Barba LF, Garcés A, Fernández I, Lara-Sánchez A, Rodríguez AM. Development of Heterobimetallic Al/Mg Complexes for the Very Rapid Ring-Opening Polymerization of Lactides. Inorg Chem 2023; 62:14833-14837. [PMID: 37676111 PMCID: PMC10521010 DOI: 10.1021/acs.inorgchem.3c02410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Indexed: 09/08/2023]
Abstract
The successful architecture of active catalytic species with enhanced efficiencies is critical for the optimal exploitation of sustainable resources in industrially demanded processes. In this work, we describe the preparation of novel helical heterobimetallic Al/Mg-based complexes of the type [AlMe2(pbpamd-)MgR{κ1-O-(OC4H8O)}] [R = Et (1a), tBu (2a)] as potential catalysts. The design was performed through the sequential addition of the Al fragment to the ligand, followed by the Mg platform, resulting in a planar π-C2N2(sp2)-Al/Mg bridging core between metals. The new heterobimetallic species have been unambiguously characterized by single-crystal X-ray analysis. NOESY, DOSY, and EXSY NMR studies as well as density functional theory calculations corroborate both a rearrangement in solution to scorpionate complexes containing an unprecedented apical carbanion with a direct σ-C(sp3)-Al covalent bond named [{Mg(R)(pbpamd-) Al(Me)2}] [R = Et (1b), tBu (2b)] and an interconversion equilibrium between both isomers. We verified their utility and high efficiency as catalysts in the well-controlled ring-opening polymerization of the biorenewable l- and rac-lactide (LA) at 23 °C, reaching a remarkable turnover frequency value close to 25000 h-1 for rac-LA at this temperature and exerting a significant level of heteroselectivity (Pr = 0.80). Very interestingly, the kinetics demonstrate apparent first-order with respect to the catalyst and LA, which supports a synergic intramolecular cooperation between centers with electronic modulation among them.
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Affiliation(s)
- Marta Navarro
- Departamento
de Biología y Geología, Física y Química
Inorgánica, Universidad Rey Juan
Carlos, 28933 Móstoles, Madrid, Spain
- Departamento
de Química Inorgánica, Orgánica y Bioquímica,
Centro de Innovación en Química Avanzada (ORFEO-CINQA),
Campus Universitario, Universidad de Castilla—La
Mancha, 13071 Ciudad Real, Spain
| | - David González-Lizana
- Departamento
de Biología y Geología, Física y Química
Inorgánica, Universidad Rey Juan
Carlos, 28933 Móstoles, Madrid, Spain
| | - Luis F. Sánchez-Barba
- Departamento
de Biología y Geología, Física y Química
Inorgánica, Universidad Rey Juan
Carlos, 28933 Móstoles, Madrid, Spain
| | - Andrés Garcés
- Departamento
de Biología y Geología, Física y Química
Inorgánica, Universidad Rey Juan
Carlos, 28933 Móstoles, Madrid, Spain
| | - Israel Fernández
- Departamento
de Química Orgánica I and Centro de Innovación
en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Agustín Lara-Sánchez
- Departamento
de Química Inorgánica, Orgánica y Bioquímica,
Centro de Innovación en Química Avanzada (ORFEO-CINQA),
Campus Universitario, Universidad de Castilla—La
Mancha, 13071 Ciudad Real, Spain
| | - Ana M. Rodríguez
- Departamento
de Química Inorgánica, Orgánica y Bioquímica,
Centro de Innovación en Química Avanzada (ORFEO-CINQA),
Campus Universitario, Universidad de Castilla—La
Mancha, 13071 Ciudad Real, Spain
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3
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Nagae H, Akebi SY, Matsushiro S, Sakamoto K, Iwasaki T, Nozaki K, Mashima K. Chain Transfer Approach for Terminal Functionalization of Alternating Copolymerization of CO 2 and Epoxide by Using Active Methylene Compounds as Chain Transfer Agents. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haruki Nagae
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Shin-ya Akebi
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Saki Matsushiro
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Kazutaka Sakamoto
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Takanori Iwasaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Kazushi Mashima
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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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
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Perfluoroaryl Zinc Catalysts Active in Cyclohexene Oxide Homopolymerization and Alternating Copolymerization with Carbon Dioxide. Catalysts 2022. [DOI: 10.3390/catal12090970] [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 zinc complex Zn(C6F5)2(toluene) (1) behaves as a very active and selective catalyst in cyclohexene oxide (CHO) polymerization to produce poly(cyclohexene oxide) (PCHO) by the trans-ring-opening of CHO with remarkable TOF values at room temperature. The ring-opening copolymerization (ROCOP) of CO2 with CHO catalysed by 1 yields poly(cyclohexene carbonate) (PCHC) when using benzyl alcohol (BnOH) as an initiator at 120°C. The 1H NMR monitoring of the in situ reaction of 1 with BnOH highlighted the formation of the dinuclear species [(C6F5)2Zn2(BnO)2 (2) that was isolated and found an active catalyst in the ROCOP of CO2 with CHO in the absence of initiators. Interestingly, PCHCs by 2 in solventless conditions show polydispersity index (Mw/Mn) values close to 2, corresponding to those expected for a single-site catalyst; on the contrary, a broader polydispersity index of the polymer products was found in toluene solution, suggesting the formation of new zinc catalysts during the polymerization reaction.
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Della Monica F, Capacchione C. Recent Advancements in Metal‐Catalysts Design for CO2/Epoxide Reactions. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200300] [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]
Affiliation(s)
- Francesco Della Monica
- Università degli Studi dell'Insubria: Universita degli Studi dell'Insubria Dipartimento di Biotecnologie e Scienze della Vita ITALY
| | - Carmine Capacchione
- Università degli Studi di Salerno Dipartimento di Chimica e Biologia "Adolfo Zambelli" via Giovanni Paolo II 84081 Fisciano SA ITALY
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7
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Loke SK, Pagadala E, Srinivasadesikan V, Thanapaul RJRS, Pooventhiran T, Thomas R, Naganjaneyulu G, Kottalanka RK. Unprecedented biological evaluation of Zn(II) complexes supported by “Self-adjustable” acyclic diiminodipyrromethane Schiff’s bases: DFT, molecular docking; biological activity studies. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108936] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Chaudhry MT, Akine S, MacLachlan MJ. Contemporary macrocycles for discrete polymetallic complexes: precise control over structure and function. Chem Soc Rev 2021; 50:10713-10732. [PMID: 34378585 DOI: 10.1039/d1cs00225b] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The growth of multimetallic clusters and complexes can proceed in the presence of suitable ligands, but often leads to polydisperse structures with poor solubility. As an alternative approach, macrocyclic molecules can anchor the multimetallic complex, directing its formation and stabilizing the resulting product. This approach can provide excellent control over the growth of clusters, and offers a handle to control solubility and other properties of the resulting complexes. In this Tutorial Review, we discuss recent activity (primarily the last two decades) directed at the controlled and reproducible synthesis of multimetallic complexes using macrocyclic ligands. Throughout the review, we focus on the unusual structures that are only accessible by using macrocycles as ligands, and their unique properties.
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Affiliation(s)
- Mohammad T Chaudhry
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada.
| | - Shigehisa Akine
- WPI Nano Life Science Institute, Kanazawa University, Kanazawa 920-1192, Japan. .,Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
| | - Mark J MacLachlan
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada. .,WPI Nano Life Science Institute, Kanazawa University, Kanazawa 920-1192, Japan. .,Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC, V6T 1Z4, Canada
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9
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Earth-abundant bimetallic and multimetallic catalysts for Epoxide/CO2 ring-opening copolymerization. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132433] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Thierer LM, Wang Q, Brooks SH, Cui P, Qi J, Gau MR, Manor BC, Carroll PJ, Tomson NC. Pyridyldiimine macrocyclic ligands: Influences of template ion, linker length and imine substitution on ligand synthesis, structure and redox properties. Polyhedron 2021; 198. [PMID: 33776186 DOI: 10.1016/j.poly.2021.115044] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A series of 2,6-diiminopyridine-derived macrocyclic ligands have been synthesized via [2+2] condensation around alkaline earth metal triflate salts. The inclusion of a tert-butyl group at the 4-position of the pyridine ring of the macrocyclic synthons results in macrocyclic complexes that are soluble in common organic solvents, thereby enabling a systematic comparison of the physical properties of the complexes by NMR spectroscopy, mass spectrometry, solution-phase UV-Vis spectroscopy, cyclic voltammetry and single-crystal X-ray crystallography. Solid-state structures determined crystallographically demonstrate increased twisting in the ligand, concurrent with either a decrease in ion size or an increase in macrocycle ring size (18, 20, or 22 membered rings). The degree of folding and twisting within the macrocycle can be quantified using parameters derived from the Npyr-M-Npyr bond angle and the relative orientation of the pyridinediimine (PDI) and pyridinedialdimine (PDAI) fragments to each other within the solid state structures. Cyclic voltammetry and UV-Vis spectroscopy were used to compare the relative energies of the imine π* orbital of the redox active PDI and PDAI components in the macrocycle when coordinated to redox inactive metals. Both methods indicate the change from a methyl to hydrogen substitution on the imine carbon lowers the energy of the ligand π* system.
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Affiliation(s)
| | | | | | - Peng Cui
- University of Pennsylvania for this work
| | - Jia Qi
- University of Pennsylvania for this work
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11
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Li JX, Du ZX, Zhang LL, Liu DL, Pan QY. Doubly mononuclear cocrystal and oxalato-bridged binuclear copper compounds containing flexible 2-((3,5,6-trichloropyridin-2-yl)oxy)acetate tectons: Synthesis, crystal analysis and magnetic properties. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119890] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Loke SK, Pagadala E, Devaraju S, Srinivasadesikan V, Kottalanka RK. New zinc complexes derived from "self-adaptable" acyclic diiminodipyrromethanes as potent catalysts for the reduction of curing temperature of bisphenol-A/F benzoxazines. RSC Adv 2020; 10:36275-36286. [PMID: 35517922 PMCID: PMC9057005 DOI: 10.1039/d0ra07837a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 09/22/2020] [Indexed: 01/17/2023] Open
Abstract
The simple modification of the Schiff-base ligands often brings significant changes in the coordination properties of the metal-complexes, providing newer prospects for their unexplored applications. In this context, the present work utilized the “self-adaptable” acyclic diiminodipyrromethane Schiff's bases (2a and 2b) for the synthesis of their Zn-based complexes and explored their potential in the ring-opening polymerization of benzoxazines. The two zinc complexes of composition [Zn{(Ph)(CH3)C(2,6-iPr2C6H3–N
Created by potrace 1.16, written by Peter Selinger 2001-2019
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CH–C4H2N)(2,6-iPr2C6H3–NCH–C4H2NH)}2] (3) and [ZnCl2{(Ph)(CH3)C(Ph3C–NHCH–C4H2N)2}] (4) were synthesized in good yields, and the structures were confirmed by single crystal X-ray diffraction (XRD). Later, zinc complexes (3 & 4) were used as catalysts to reduce the curing (ring-opening polymerization) temperature of benzoxazine monomers such as Bisphenol-A (BA-a) and Bisphenol-F (BF-a) benzoxazines. Dynamic scanning calorimetry (DSC) studies revealed that the on-set curing (Tp) temperatures were reasonably decreased upto 20% for the benzoxazines. Furthermore, the thermal stabilities of the polybenzoxazines (PBzs) derived in the presence of zinc catalysts (3 and 4) were compared with PBz obtained in the absence of catalyst under similar conditions. The thermal studies reveled that there is no significant changes in the initial degradation of polymers. However, the thermal stability in terms of char yields at 800 °C improved upto 10–21% for the bisphenol-A/F benzoxazines. The present work utilized the “self-adaptable” acyclic diiminodipyrromethane Schiff's bases (2a and 2b) for the synthesis of their Zn-based complexes and explored their potential in the ring-opening polymerization of BA-a and BF-a benzoxazines.![]()
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Affiliation(s)
- Shiva K Loke
- Division of Chemistry, Department of Sciences and Humanities, Vignan's Foundation for Science Technology and Research (Deemed to be University) Vadlamudi Guntur-522213 Andhra Pradesh India +91 863 2344 707 +91 863 2344 700
| | - Eswar Pagadala
- Division of Chemistry, Department of Sciences and Humanities, Vignan's Foundation for Science Technology and Research (Deemed to be University) Vadlamudi Guntur-522213 Andhra Pradesh India +91 863 2344 707 +91 863 2344 700
| | - S Devaraju
- Division of Chemistry, Department of Sciences and Humanities, Vignan's Foundation for Science Technology and Research (Deemed to be University) Vadlamudi Guntur-522213 Andhra Pradesh India +91 863 2344 707 +91 863 2344 700
| | - V Srinivasadesikan
- Division of Chemistry, Department of Sciences and Humanities, Vignan's Foundation for Science Technology and Research (Deemed to be University) Vadlamudi Guntur-522213 Andhra Pradesh India +91 863 2344 707 +91 863 2344 700
| | - Ravi K Kottalanka
- Division of Chemistry, Department of Sciences and Humanities, Vignan's Foundation for Science Technology and Research (Deemed to be University) Vadlamudi Guntur-522213 Andhra Pradesh India +91 863 2344 707 +91 863 2344 700
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13
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Sobrino S, Navarro M, Fernández-Baeza J, Sánchez-Barba LF, Lara-Sánchez A, Garcés A, Castro-Osma JA, Rodríguez AM. Efficient Production of Poly(Cyclohexene Carbonate) via ROCOP of Cyclohexene Oxide and CO 2 Mediated by NNO-Scorpionate Zinc Complexes. Polymers (Basel) 2020; 12:polym12092148. [PMID: 32967153 PMCID: PMC7569798 DOI: 10.3390/polym12092148] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 09/17/2020] [Accepted: 09/18/2020] [Indexed: 02/06/2023] Open
Abstract
New mono- and dinuclear chiral alkoxide/thioalkoxide NNO-scorpinate zinc complexes were easily synthesized in very high yields, and characterized by spectroscopic methods. X-ray diffraction analysis unambiguously confirmed the different nuclearity of the new complexes as well as the variety of coordination modes of the scorpionate ligands. Scorpionate zinc complexes 2, 4 and 6 were assessed as catalysts for polycarbonate production from epoxide and carbon dioxide with no need for a co-catalyst or activator under mild conditions. Interestingly, at 70 °C, 10 bar of CO2 pressure and 1 mol % of loading, the dinuclear thioaryloxide [Zn(bpzaepe)2{Zn(SAr)2}] (4) behaves as an efficient and selective one-component initiator for the synthesis of poly(cyclohexene carbonate) via ring-opening copolymerization of cyclohexene oxide (CHO) and CO2, affording polycarbonate materials with narrow dispersity values.
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Affiliation(s)
- Sonia Sobrino
- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain; (S.S.); (J.F.-B.); (A.L.-S.); (J.A.C.-O.); (A.M.R.)
| | - Marta Navarro
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain; (M.N.); (A.G.)
| | - Juan Fernández-Baeza
- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain; (S.S.); (J.F.-B.); (A.L.-S.); (J.A.C.-O.); (A.M.R.)
| | - Luis F. Sánchez-Barba
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain; (M.N.); (A.G.)
- Correspondence: ; Tel.: +34-91-488-8504
| | - Agustín Lara-Sánchez
- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain; (S.S.); (J.F.-B.); (A.L.-S.); (J.A.C.-O.); (A.M.R.)
| | - Andrés Garcés
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, 28933 Madrid, Spain; (M.N.); (A.G.)
| | - José A. Castro-Osma
- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain; (S.S.); (J.F.-B.); (A.L.-S.); (J.A.C.-O.); (A.M.R.)
| | - Ana M. Rodríguez
- Centro de Innovación en Química Avanzada (ORFEO-CINQA), Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Campus Universitario, 13071 Ciudad Real, Spain; (S.S.); (J.F.-B.); (A.L.-S.); (J.A.C.-O.); (A.M.R.)
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Abstract
Abiotic allosterism is most commonly observed in hetero-bimetallic supramolecular complexes and less frequently in homo-bimetallic complexes. The use of hemilabile ligands with high synthetic complexity enables the catalytic center by the addition or removal of allosteric effectors and simplicity is unusually seen in these systems. Here we describe a simpler approach to achieve kinetic regulation by the use of dimeric Schiff base copper complexes connected by a chlorido ligand bridge. The chlorido ligand acts as a weak link between monomers, generating homo-bimetallic self-aggregating supramolecular complexes that generate monomeric species in different reaction rates depending on the solvent and on the radical moiety of the ligand. The ligand exchange was observed by electron paramagnetic resonance (EPR) and conductivity measurements, indicating that complexes with ligands bearing methoxyl (CuIIL2) and ethoxyl (CuIIL5) radicals were more prone to form dimeric complexes in comparison to ligands bearing hydrogen (CuIIL1), methyl (CuIIL3), or t-butyl (CuIIL4) radicals. The equilibrium between dimer and monomer afforded different reactivities of the complexes in acetonitrile/water and methanol/water mixtures toward urea hydrolysis as a model reaction. It was evident that the dimeric species were inactive and that by increasing the water concentration in the reaction medium, the dimeric structures dissociated to form the active monomeric structures. This behavior was more pronounced when methanol/water mixtures were employed due to a slower displacement of the chlorido bridge in this medium than in the acetonitrile/water mixtures, enabling the reaction kinetics to be evaluated. This effect was attributed to the preferential solvation shell by the organic solvents and in essence, an upregulation behavior was observed due to the intrinsic nature of the complexes to form dimeric structures in solution that could be dismantled in the presence of water, indicating their possible use as water-sensors in organic solvents.
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Soobrattee S, Zhai X, Nyamayaro K, Diaz C, Kelley P, Ebrahimi T, Mehrkhodavandi P. Dinucleating Amino-Phenolate Platform for Zinc Catalysts: Impact on Lactide Polymerization. Inorg Chem 2020; 59:5546-5557. [PMID: 32223228 DOI: 10.1021/acs.inorgchem.0c00250] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We report imine- and amine-based dinucleating ligands bearing a bisphenol backbone and explore their coordination chemistry with zinc to form zinc alkyl, alkoxide, acetate, and amide complexes. Full characterization of the complexes shows that this ligand framework can support dinuclear and trinuclear complexes. We explore the reactivity of the zinc alkyl and alkoxide complexes as catalysts for the ring opening polymerization of lactide and compared this reactivity to analogous mononuclear complexes. We show that 1) The amine-based complexes are more reactive than the imine-based analogues; 2) The trinuclear zinc alkyl species show unusual control and reproducibility for lactide polymerization; and 3) The extent of bimetallic cooperation is hampered by the ability of the ligand framework to form trinuclear clusters.
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Affiliation(s)
- Shazia Soobrattee
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Xiaofang Zhai
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Kudzanai Nyamayaro
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Carlos Diaz
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Paul Kelley
- 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
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
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16
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Shin JW, Jeong AR, Kim Y, Kim DW, Lee SG, Lee H, Moon D. Solvent-triggered single-crystal-to-single-crystal transformation from a monomeric to polymeric copper(II) complex based on an aza macrocyclic ligand. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:225-232. [PMID: 32831224 DOI: 10.1107/s2052520620002371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 02/19/2020] [Indexed: 05/12/2023]
Abstract
Reversible solvent-triggered single-crystal-to-single-crystal (SCSC) transformations are observed between two copper(II) azamacrocyclic complexes: [Cu(C16H38N6)(H2O)2](C12H6O4) (1) and [Cu(C16H38N6)(C12H6O4)] (2). Complex (1) was prepared via self-assembly of a copper(II) azamacrocyclic complex containing butyl pendant groups, [Cu(C16H38N6)(ClO4)2], with 2,7-naphthalenedicarboxylic acid. When monomeric compound (1) was immersed in CH3OH, coordination polymer (2) was obtained, indicating a solvent-triggered SCSC transformation. Furthermore, when (2) was immersed in water, an reverse SCSC transformation from (2) to (1) occurred. Complex (1) presents a 3D supramolecular structure formed via intermolecular hydrogen-bonding interactions, whereas complex (2) features a 1D zigzag coordination polymer. The reversible SCSC transformation of (1) and (2) was characterized using single-crystal X-ray diffraction and in situ powder X-ray diffraction techniques. Despite its poor porosity, complex (2) displayed interesting CO2 adsorption behaviour under CO2 gas.
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Affiliation(s)
- Jong Won Shin
- Daegu Gyungbuk Branch, Korea Institute of Science and Technology Information, 10 Excoro, Bukgu, Daegu 41515, Republic of Korea
| | - Ah Rim Jeong
- Daegu Center, Korea Basic Science Institute, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Younghak Kim
- Pohang Accelerator Laboratory/POSTECH, 80 Jigokoro-127-beongil, Namgu, Pohang 37673, Republic of Korea
| | - Dae Woong Kim
- Beamline Department, Pohang Accelerator Laboratory/POSTECH, 80 Jigokoro-127-beongil, Namgu, Pohang 37673, Republic of Korea
| | - Sang Geul Lee
- Daegu Center, Korea Basic Science Institute, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Hyosun Lee
- Chemistry and Green-Nano Materials Research Centre, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea
| | - Dohyun Moon
- Beamline Department, Pohang Accelerator Laboratory/POSTECH, 80 Jigokoro-127-beongil, Namgu, Pohang 37673, Republic of Korea
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17
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Cozzolino M, Melchionno F, Santulli F, Mazzeo M, Lamberti M. Aldimine‐Thioether‐Phenolate Based Mono‐ and Bimetallic Zinc Complexes as Catalysts for the Reaction of CO
2
with Cyclohexene Oxide. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000119] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mariachiara Cozzolino
- Department of Chemistry and Biology “Adolfo Zambell” University of Salerno Via Giovanni Paolo II, 132 84084 Fisciano SA Italy
| | - Flavia Melchionno
- Department of Chemistry and Biology “Adolfo Zambell” University of Salerno Via Giovanni Paolo II, 132 84084 Fisciano SA Italy
| | - Federica Santulli
- Department of Chemistry and Biology “Adolfo Zambell” University of Salerno Via Giovanni Paolo II, 132 84084 Fisciano SA Italy
| | - Mina Mazzeo
- Department of Chemistry and Biology “Adolfo Zambell” University of Salerno Via Giovanni Paolo II, 132 84084 Fisciano SA Italy
| | - Marina Lamberti
- Department of Chemistry and Biology “Adolfo Zambell” University of Salerno Via Giovanni Paolo II, 132 84084 Fisciano SA Italy
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18
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Sobrino S, Navarro M, Fernández-Baeza J, Sánchez-Barba LF, Garcés A, Lara-Sánchez A, Castro-Osma JA. Efficient CO2 fixation into cyclic carbonates catalyzed by NNO-scorpionate zinc complexes. Dalton Trans 2019; 48:10733-10742. [DOI: 10.1039/c9dt01844a] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Chiral bifunctional and bicomponent NNO-scorpionate zinc-based catalysts have been developed for the fixation of CO2 into cyclic carbonates with broad substrate scope and functional group tolerance under mild and solvent-free conditions.
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Affiliation(s)
- Sonia Sobrino
- Universidad de Castilla-La Mancha
- Departamento de Química Inorgánica
- Orgánica y Bioquímica
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Campus Universitario
- 13071-Ciudad Real
| | - Marta Navarro
- Universidad Rey Juan Carlos
- Departamento de Biología y Geología
- Física y Química Inorgánica
- Móstoles-28933-Madrid
- Spain
| | - Juan Fernández-Baeza
- Universidad de Castilla-La Mancha
- Departamento de Química Inorgánica
- Orgánica y Bioquímica
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Campus Universitario
- 13071-Ciudad Real
| | - Luis F. Sánchez-Barba
- Universidad Rey Juan Carlos
- Departamento de Biología y Geología
- Física y Química Inorgánica
- Móstoles-28933-Madrid
- Spain
| | - Andrés Garcés
- Universidad Rey Juan Carlos
- Departamento de Biología y Geología
- Física y Química Inorgánica
- Móstoles-28933-Madrid
- Spain
| | - Agustín Lara-Sánchez
- Universidad de Castilla-La Mancha
- Departamento de Química Inorgánica
- Orgánica y Bioquímica
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Campus Universitario
- 13071-Ciudad Real
| | - José A. Castro-Osma
- Universidad de Castilla-La Mancha
- Departamento de Química Inorgańica
- Orgańica y Bioquímica
- Centro de Innovación en Química Avanzada (ORFEO–CINQA)
- Facultad de Farmacia
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19
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Zheng C, Liang M, Sun H, Ma J, Bi X, Zhao Y, Tan W, Li H. A high-nuclearity complex containing a decanuclear iron( iii)/oxo cage in a football-like structure and rare ( R-/ S)-hemiacetalate ligands in a butterfly-like format. RSC Adv 2019; 9:39965-39969. [PMID: 35541378 PMCID: PMC9076206 DOI: 10.1039/c9ra07556a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 11/26/2019] [Indexed: 12/21/2022] Open
Abstract
A challenge in the field of high nuclearity Fe(iii)/oxo cluster chemistry remains the development of new synthetic methods to such molecules. In this work, the employment of pyridine-2-carboxaldehyde (py-2-al) in high-nuclearity transition-metal cluster chemistry has provided access to an unprecedented decanuclear iron(iii) complex, [Fe10(NO3)7(O)6(OH0.5)2((S)-py-hemi)4((R)-py-hemi)4]·4H2O (1) ((R-/S)-py-hemi = (R-/S)-pyridine-2-carboxaldehyde hemiacetalate). The synthesis, beautiful structure and the physical characterization (thermal gravimetric analysis, X-ray powder diffraction, proton nuclear magnetic resonance, magnetic susceptibility) of complex 1 are described in this contribution. Complex 1 provides a new route to obtain high nuclearity magnetic clusters with beautiful structures. The employment of pyridine-2-carboxaldehyde in high-nuclearity cluster chemistry has provided access to a decanuclear iron(iii)/oxo cage in football-like structure and unusual (R-/S)-hemiacetalate ligands in butterfly-like format.![]()
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Affiliation(s)
- Chunying Zheng
- School of Environmental and Municipal Engineering
- Qingdao University of Technology
- Qingdao
- People's Republic of China
| | - Mingyue Liang
- School of Environmental and Municipal Engineering
- Qingdao University of Technology
- Qingdao
- People's Republic of China
| | - Haofen Sun
- School of Environmental and Municipal Engineering
- Qingdao University of Technology
- Qingdao
- People's Republic of China
| | - Jiping Ma
- School of Environmental and Municipal Engineering
- Qingdao University of Technology
- Qingdao
- People's Republic of China
| | - Xuejun Bi
- School of Environmental and Municipal Engineering
- Qingdao University of Technology
- Qingdao
- People's Republic of China
| | - Yang Zhao
- School of Environmental and Municipal Engineering
- Qingdao University of Technology
- Qingdao
- People's Republic of China
| | - Weiqiang Tan
- School of Environmental and Municipal Engineering
- Qingdao University of Technology
- Qingdao
- People's Republic of China
| | - Hui Li
- School of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing 100081
- People's Republic of China
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