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Li F, He J, Song T, Gao W, Mu X, Mu Y. Zirconium Complexes with Bulkier Amine Bis(phenolate) Ligands and Their Catalytic Properties for Ethylene (Co)polymerization. Inorg Chem 2022; 61:6469-6479. [PMID: 35436094 DOI: 10.1021/acs.inorgchem.2c00061] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of new zirconium complexes bearing bulkier amine bis(phenolate) tetradentate ligands, Me2NCH2CH2N{CH2(2-O-3-R-5-tBu-C6H2)}2ZrCl2 [R = CPhMe2 (1); CMePh2 (2); CPh3 (3); Ph (4); 3,5-Me2C6H3 (5); 3,5-tBu2C6H3 (6); 4-tBuC6H4 (7)], were synthesized and characterized by 1H nuclear magnetic resonance (NMR), 13C NMR, and elemental analyses. The molecular structures of complexes 1 and 3 were determined by single-crystal X-ray diffraction analysis. The X-ray crystallography analysis reveals that these complexes display a slightly distorted octahedral geometry around their metal centers. Upon activation with methylaluminoxane (MAO), dry-MAO, MAO/butylated hydroxytoluene (BHT), or AliBu3/CPh3B(C6F5)4, these zirconium complexes exhibit high catalytic activity for ethylene polymerization [up to 1.07 × 107 g PE (mol Zr)-1 h-1] and ethylene/1-hexene copolymerization [up to 2.78 × 107 g polymer (mol Zr)-1 h-1], affording (co)polymers with moderate to high molecular weights and good comonomer incorporations. The zirconium complexes with bulkier R groups show higher catalytic activities and longer lifetimes and produce polymers with higher molecular weights, while the zirconium complexes with aryls as R groups demonstrate relatively good comonomer incorporation ability for the copolymerization reactions. These catalytic systems also show moderate catalytic activities for the polymerization reactions of propylene, 1-hexene, and 1-decene. Upon activation with MAO, the zirconium complexes also show moderate catalytic activities for the copolymerization reaction of ethylene with 3-buten-1-ol (treated with 1 equiv of AliBu3), affording copolymers with the incorporation of 3-buten-1-ol up to 1.05%.
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Affiliation(s)
- Feng Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Jianghao He
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Tingting Song
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Wei Gao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Xiaoyue Mu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
| | - Ying Mu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China
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Gurung RK, McMillen CD, Jarrett WL, Holder AA. Synthesis, characterization, NMR spectroscopic, and X-ray crystallographic studies of new titanium(IV) Schiff base salen complexes: Formation of intriguing titanium(IV) species. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119496] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Synthesis, spectral, electrochemical, in-vitro antimicrobial and antioxidant activities of bisphenolic mannich base and 8-hydroxyquinoline based mixed ligands and their transition metal complexes. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.126886] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Barroso S, Coelho AM, Adão P, Calhorda MJ, Martins AM. Radical reactions of diamine bis(phenolate) vanadium(iii) complexes. Solid state binding of O 2 to form a vanadium(v) peroxo complex. Dalton Trans 2017; 46:9692-9704. [PMID: 28714510 DOI: 10.1039/c7dt01699a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
[VCl3(THF)3] reacted with the sodium salt of a tripodal diamine bisphenolate ligand precursor Na2L2 to give a paramagnetic d2 complex [V(L2)Cl] (2). The reaction of 2 with oxygen is strongly dependent on the experimental conditions, affording [VO(L2)Cl] (6) or [V(η2-O2)(L2)Cl] (7). The formation of 7 involves the direct addition of O2 to V(iii) in the solid state with oxidation to V(v) without significantly disturbing the structure of 2. DFT calculations showed that compound 7 is an intermediate in the formation of 6 from 2. The reaction involves the cleavage of the η1-O-O bond in a proposed dimeric species. The overall reaction of 2 moles of vanadium(iii), complex 2, and one mole of O2 to yield two moles of product 6 is a favourable process with ΔG298 = -38.3 kcal mol-1. 7 is the first non-oxido peroxidovanadium(v) complex obtained directly from the reaction of a crystal and the second example of a structurally characterized complex of that type. Reactions of V(L1)Cl (1) and V(L2)Cl (2) with one equivalent of the nitroxyl radical TEMPO in toluene also result in the formation of oxido V(v) complexes, VO(L1)Cl (5) and VO(L2)Cl (6). The reaction of VO(OiPr)3 with Na2L2 afforded [VO(L2)(OiPr)] (8) in high yield. A major isomer having the V[double bond, length as m-dash]O moiety in the equatorial plane was characterised by X-ray diffraction although solution NMR data showed the presence of a minor species with the oxido ligand trans to the tripodal nitrogen, as in 6. Complexes 6 and 8 are very active and selective sulfoxidation catalysts of thioanisole, but no enantiomeric excess was obtained.
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Affiliation(s)
- Sónia Barroso
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Ana M Coelho
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Pedro Adão
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
| | - Maria José Calhorda
- Centro de Química e Bioquímica, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Ed. C8, 1749-016 Lisboa, Portugal
| | - Ana M Martins
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
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Hierro ID, Pérez Y, Fajardo M. Heterogenization of titanium(IV) complexes with amine bis(phenolate) ligands onto SBA-15: exploring their catalytic epoxidation and electrochemical behaviour. Appl Organomet Chem 2016. [DOI: 10.1002/aoc.3418] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Isabel del Hierro
- Departamento de Biología, Geología, Física y Química Inorgánica (ESCET); Universidad Rey Juan Carlos; 28933 Móstoles Madrid Spain
| | - Yolanda Pérez
- Departamento de Biología, Geología, Física y Química Inorgánica (ESCET); Universidad Rey Juan Carlos; 28933 Móstoles Madrid Spain
| | - Mariano Fajardo
- Departamento de Biología, Geología, Física y Química Inorgánica (ESCET); Universidad Rey Juan Carlos; 28933 Móstoles Madrid Spain
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Barroso S, de Aguiar SR, Munhá RF, Martins AM. New zirconium complexes supported by N-heterocyclic carbene (NHC) ligands: Synthesis and assessment of hydroamination catalytic properties. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.11.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Barroso S, Coelho AM, Gómez-Ruiz S, Calhorda MJ, Žižak Ž, Kaluđerović GN, Martins AM. Synthesis, cytotoxic and hydrolytic studies of titanium complexes anchored by a tripodal diamine bis(phenolate) ligand. Dalton Trans 2014; 43:17422-33. [DOI: 10.1039/c4dt00975d] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Carretas JM, Barroso S, Cui J, Cruz A, Santos IC, Martins AM. Diamine bis(phenolate) samarium complexes: Synthesis and structures. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2013.07.051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Barroso S, Madeira F, Calhorda MJ, Ferreira MJ, Duarte MT, Martins AM. Toward the understanding of radical reactions: experimental and computational studies of titanium(III) diamine bis(phenolate) complexes. Inorg Chem 2013; 52:9427-39. [PMID: 23924047 DOI: 10.1021/ic401008y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Radical reactions of titanium(III) [Ti((tBu2)O2NN')Cl(S)] (S = THF, 1; S = py, 2; (tBu2)O2NN' = Me2N(CH2)2N(CH2-2-O-3,5-(t)Bu2C6H2)2) are described. Reactions with neutral electron acceptors led to metal oxidation to Ti(IV), [Ti((tBu2)O2NN')Cl(TEMPO)] (4) being formed with the TEMPO radical and [Ti((tBu2)O2NN')Cl2] (9) with PhN═NPh. [Ti((tBu2)O2NN')Cl2] was also formed when [Ti((tBu2)O2NN')Cl(S)] was oxidized by [Cp2Fe][BPh4], but the [Cp2Fe][PF6] analogue yielded [Ti((tBu2)O2NN')ClF] (8). The reactions of [Ti((tBu2)O2NN')Cl(S)] with O2 gave [Ti((tBu2)O2NN')Cl]2(μ-O) (3). The DFT calculated Gibbs energy for the above reaction showed it to be exergonic (ΔG298 = -123.6 kcal·mol(-1)). [Ti((tBu2)O2NN')(CH2Ph)(S)] (S = THF, 5; py, 6) are not stable in solution for long periods and in diethyl ether gave 1:1 cocrystals of [Ti((tBu2)O2NN')(CH2Ph)2] (7) and [Ti((tBu2)O2NN')Cl]2(μ-O) (3), most probably resulting from a disproportionation process of titanium(III) followed by oxygen abstraction by the resulting Ti(II) species. The oxidation of [Ti((tBu2)O2NN')(κ(2)-{CH2-2-(NMe2)-C6H4})] (10), which is a Ti(III) benzyl stabilized by the intramolecular coordination of the NMe2 moiety, led to a complex mixture. Recrystallization of this mixture under air led to a 1:1 cocrystal of two coordination isomers of the titanium oxo dimer (3). In one of these isomers, one metal is pentacoordinate and the dimethylamine moiety of the diamine bis(phenolate) ligand is not bonded to the metal, displaying a coordination mode of the ligand never observed before. The other titanium center is distorted octahedral with two cis-phenolate moieties. In the second unit, the coordination of the two ancillary ligands to the titanium centers reveals mutually cis-phenolate groups in one-half of the molecule and trans-coordinated in the other titanium center, keeping a distorted octahedral environment around each titanium.
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Affiliation(s)
- Sónia Barroso
- Centro de Química Estrutural, Instituto Superior Técnico, TU Lisbon, 1049-001 Lisboa, Portugal
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Saunders LN, Pratt ME, Hann SE, Dawe LN, Decken A, Kerton FM, Kozak CM. Structural variations in the coordination chemistry of amine-bis(phenolate) cobalt(II/III) complexes. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.07.082] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Lei H, Royer AM, Rauchfuss TB, Gray D. C2-Symmetric Iron(II) Diphosphine–Dialkoxide Dicarbonyl and Related Complexes. Organometallics 2012. [DOI: 10.1021/om300631a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hao Lei
- School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States
| | - Aaron M. Royer
- School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States
| | - Thomas B. Rauchfuss
- School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States
| | - Danielle Gray
- School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801, United States
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Munhá RF, Ballmann J, Veiros LF, Patrick BO, Fryzuk MD, Martins AM. Dinuclear Cationic Zirconium Hydrides Stabilized by the N,N-Dibenzylcyclam Ancillary Ligand. Organometallics 2012. [DOI: 10.1021/om300504q] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rui F. Munhá
- Centro de Química Estrutural,
Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais No. 1, 1049-001 Lisboa,
Portugal
- Department of Chemistry, The University of British Columbia, 2036 Main Mall,
Vancouver, British Columbia, Canada V6T 1Z1
| | - Joachim Ballmann
- Department of Chemistry, The University of British Columbia, 2036 Main Mall,
Vancouver, British Columbia, Canada V6T 1Z1
| | - Luis F. Veiros
- Centro de Química Estrutural,
Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais No. 1, 1049-001 Lisboa,
Portugal
| | - Brian O. Patrick
- Department of Chemistry, The University of British Columbia, 2036 Main Mall,
Vancouver, British Columbia, Canada V6T 1Z1
| | - Michael D. Fryzuk
- Department of Chemistry, The University of British Columbia, 2036 Main Mall,
Vancouver, British Columbia, Canada V6T 1Z1
| | - Ana M. Martins
- Centro de Química Estrutural,
Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais No. 1, 1049-001 Lisboa,
Portugal
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Madeira F, Barroso S, Namorado S, Reis PM, Royo B, Martins AM. Epoxidation of cis-cyclooctene using diamine bis(phenolate) vanadium, molybdenum and tungsten complexes as catalysts. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.10.071] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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