1
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Gao Z, Tian J, Han Y, Liu S, Li Z. Zirconium and Hafnium Complexes Bearing Tridentate ONN-Ligands: Extremely High Activity toward Ethylene (Co)Polymerization. Inorg Chem 2024; 63:18137-18145. [PMID: 39287224 DOI: 10.1021/acs.inorgchem.4c02906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
The pursuit of high-performance catalysts in the realm of polyolefins is a constant goal. In this study, a range of zirconium (1-ZrCl3, 2-ZrCl3, 3-ZrCl4, 12-Zr) and hafnium (1-HfCl3, 12-Hf) complexes featuring phenoxy-imine-amine ONN-ligands (2,6-R2-C6H3-NH-C6H4-N═CH-C6H2-3,5-tBu2-OH; 1-L: R = H; 2-L: R = F; 3-L: R = iPr) were synthesized and characterized using NMR spectroscopy, as well as single-crystal X-ray diffraction for 2-ZrCl3, 3-ZrCl4, and 12-Zr. These Zr and Hf complexes exhibited remarkable efficiency for ethylene homopolymerization and copolymerization with 1-octene when paired with MAO as the cocatalyst. Notably, the Zr complexes outperformed the Hf complexes with the same ligand, underscoring the substantial impact of the metal center on catalytic performance. The substituents and coordination modes of the ligands also exerted significant influence on the catalytic behavior, affecting both the activity and properties of the resulting polymers. Particularly noteworthy was the exceptional activity of 1-ZrCl3, achieving activity as high as 6.30 × 108 g(PE)·mol-1(Zr)·h-1 for ethylene homopolymerization and generating bi- or multimodal distribution polyethylene. The activation of 1-ZrCl3 by 5 or 20 equiv of d-MAO afforded a dinuclear Zr complex bridged by two chlorides (μ-Cl2-(1-ZrCl2)2), which was analyzed and confirmed by in situ 1H NMR spectroscopy and single-crystal X-ray diffraction.
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Affiliation(s)
- Zhihao Gao
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Jiliang Tian
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Yingxia Han
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Shaofeng Liu
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhibo Li
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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2
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Kuznetsova AA, Chachkov DV, Belogorlova NA, Malysheva SF, Vereshchagina YA. Structure of Tris[2-(4-pyridyl)ethyl]phosphine, Tris[2-(2-pyridyl)ethyl]phosphine, and Their Chalcogenides in Solution: Dipole Moments, IR Spectroscopy, and DFT Study. Molecules 2023; 29:110. [PMID: 38202693 PMCID: PMC10779502 DOI: 10.3390/molecules29010110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/14/2023] [Accepted: 12/18/2023] [Indexed: 01/12/2024] Open
Abstract
Tris(hetaryl)substituted phosphines and their chalcogenides are promising polydentate ligands for the design of metal complexes. An experimental and theoretical conformational analysis of tris[2-(4-pyridyl)ethyl]phosphine, tris[2-(2-pyridyl)ethyl]phosphine, and their chalcogenides was carried out by the methods of dipole moments, IR spectroscopy and DFT B3PW91/6-311++G(df,p) calculations. In solution, these compounds exist as an equilibrium of mainly non-eclipsed (synclinal or antiperiplanar) forms with a predominance of a symmetrical conformer having a gauche-orientation of the Csp3-Csp3 bonds of pyridylethyl substituents relative to the P=X bond (X = lone pair, O, S, Se) and a gauche-orientation of the pyridyl rings relative to the zigzag ethylene bridges. Regardless of the presence and nature of the chalcogen atom (oxygen, sulfur, or selenium) in the studied molecules with many axes of internal rotation, steric factors-the different position of the nitrogen atoms in the pyridyl rings and the configuration of ethylene bridges-determine the realization and spatial structure of preferred conformers.
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Affiliation(s)
- Anastasiia A. Kuznetsova
- Department of Physical Chemistry, A.M. Butlerov Institute of Chemistry, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia;
| | - Denis V. Chachkov
- Kazan Department of Joint Supercomputer Center of Russian Academy of Sciences—Branch of Federal Scientific Center “Scientific Research Institute for System Analysis of the RAS”, Lobachevskogo 2/31, 420111 Kazan, Russia;
| | - Natalia A. Belogorlova
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorskogo 1, 664033 Irkutsk, Russia; (N.A.B.); (S.F.M.)
| | - Svetlana F. Malysheva
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Favorskogo 1, 664033 Irkutsk, Russia; (N.A.B.); (S.F.M.)
| | - Yana A. Vereshchagina
- Department of Physical Chemistry, A.M. Butlerov Institute of Chemistry, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia;
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3
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da Silva SM, Pinheiro AC, da Costa MT, Alves TC, Oliboni RS, Stieler R, Casagrande AC, Casagrande O. Oligo- and polymerization of ethylene by pyrrolide-imine chromium catalysts bearing pendant O-, S- and N-donor groups. Synthesis, characterization and DFT studies. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Namdeo PK, Sheokand S, Kote BS, Radhakrishna L, Kunchur HS, Saini P, Ramakrishnan S, Balakrishna MS. Ru II complexes of 1,2,3-triazole appended tertiary phosphines, [P(Ph){( o-C 6H 4)(1,2,3-N 3C(Ph)CH} 2] and [P(Ph){ o-C 6H 4(CCH)-(1,2,3-N 3-Ph)} 2]: highly active catalysts for transfer hydrogenation of carbonyl/nitro compounds and for α-alkylation of ketones. Dalton Trans 2022; 51:6795-6808. [PMID: 35420618 DOI: 10.1039/d2dt00361a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The synthesis of two new 1,2,3-triazole appended monophosphines [P(Ph){(o-C6H4)(1,2,3-N3C(Ph)CH}2] (1) and [P(Ph){o-C6H4(CCH)(1,2,3-N3-Ph)}2] (2) and their RuII complexes is described. The reactions of 1 and 2 with [Ru(PPh3)3Cl2] in a 1 : 1 molar ratio produced cationic complexes 3 and 4, respectively. Both the complexes showed very high catalytic activity towards transfer hydrogenation, nitro reduction, and α-alkylation reactions and afforded the corresponding products in good to excellent yields. The free energy of β-hydride elimination from the respective Ru-alkoxide intermediates, a key mechanistic step common to all the three catalytic pathways, was calculated to be close to ergoneutral by density functional theory-based calculations, which is posited to rationalize the catalytic activity of 3. The reduction of aromatic nitro compounds was found to be highly chemoselective and produced the corresponding amines as major products even in the presence of a carbonyl group. The triazolyl-N2 coordinated RuII-NPN complex 3 showed better catalytic activity compared to the triazolyl-N3 coordinated complex 4.
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Affiliation(s)
- Pavan K Namdeo
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Sonu Sheokand
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Basvaraj S Kote
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Latchupatula Radhakrishna
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Harish S Kunchur
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Prateek Saini
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Srinivasan Ramakrishnan
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Maravanji S Balakrishna
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
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5
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Wang D, Zhou S, Liu Y, Kang X, Liu S, Li Z, Braunstein P. Controlling Polyethylene Molecular Weights and Distributions Using Chromium Complexes Supported by SNN-Tridentate Ligands. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02351] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dongqi Wang
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Shengmei Zhou
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Yongxin Liu
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Xiaohui Kang
- College of Pharmacy, Dalian Medical University, Dalian 116044, China
| | - Shaofeng Liu
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhibo Li
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination, CNRS, CHIMIE UMR 7177, Université de Strasbourg, 4 rue Blaise Pascal, 67081 Cedex Strasbourg, France
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6
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Tian J, Zhang X, Liu S, Li Z. Chromium Complexes Supported by NNO-Tridentate Ligands: An Unprecedent Activity with the Low Requirement of MAO. Polym Chem 2022. [DOI: 10.1039/d2py00125j] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The development of metal catalysts with high activity and thermal stability but low requirement of MAO as cocatalyst is highly desired for polyolefin industrial application. In this contribution, a series...
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7
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Keske EC, Sattler MO, Lough AJ, Morris RH. Tridentate NPN Ligands with a Central Secondary Phosphine Oxide Donor and their Corresponding Metal Complexes. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Eric C. Keske
- Department of Chemistry University of Toronto 80 Saint George St. Toronto, Ontario M4K 3Y1 Canada
- Chemistry Department Trent University 1600 West Bank Drive Peterborough, Ontario K9L 0G2 Canada
| | - Madeleine O. Sattler
- Department of Chemistry University of Toronto 80 Saint George St. Toronto, Ontario M4K 3Y1 Canada
| | - Alan J. Lough
- Department of Chemistry University of Toronto 80 Saint George St. Toronto, Ontario M4K 3Y1 Canada
| | - Robert H. Morris
- Department of Chemistry University of Toronto 80 Saint George St. Toronto, Ontario M4K 3Y1 Canada
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8
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Abstract
AbstractLinear α-olefins or LAOs are produced by the catalytic oligomerisation of ethylene on a multimillion ton scale annually. A range of LAOs is typically obtained with varying chain lengths which follow a distribution. Depending on the catalyst, various types of distributions have been identified, such as Schulz–Flory, Poisson, alternating and selective oligomerisations such as ethylene trimerisation to 1-hexene and tetramerisation to 1-octene. A comprehensive mathematical analysis for all oligomer distributions is presented, showing the relations between the various distributions and with ethylene polymerisation, as well as providing mechanistic insight into the underlying chemical processes.
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9
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Gusarova NK, Trofimov BA. Organophosphorus chemistry based on elemental phosphorus: advances and horizons. RUSSIAN CHEMICAL REVIEWS 2020. [DOI: 10.1070/rcr4903] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The results of studies on the application of elemental phosphorus for the synthesis of important organophosphorus compounds are surveyed and summarized. Currently, this trend represents a synthetically, environmentally and technologically attractive alternative to classical organophosphorus chemistry based on toxic and corrosive phosphorus chlorides. Direct phosphination and phosphinylation of organic compounds with elemental phosphorus (discussed in the first part of the review) basically extend the range of available phosphines, phosphine chalcogenides and phosphinic acids and provides further development of their synthetic potential (discussed in the second part of the review). It is shown that the breakthrough in this area is largely due to the discovery of reactions of elemental phosphorus (white and red) with various electrophiles in superbasic suspensions and emulsions derived from alkali metal hydroxides and to the development of electrochemical, electrocatalytic and catalytic activation of white phosphorus.
The bibliography includes 299 references.
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10
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Linert S, Wagner S, Schmidt P, Higham L, Hepples C, Waddell P, Karaghiosoff K. Novel Cu(I) complexes of functionalized phosphines. PHOSPHORUS SULFUR 2019. [DOI: 10.1080/10426507.2018.1543298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- S. Linert
- Department of Chemistry, Ludwig-Maximilian University, Munich, Germany
| | - S. Wagner
- Department of Chemistry, Ludwig-Maximilian University, Munich, Germany
| | - P. Schmidt
- Department of Chemistry, Ludwig-Maximilian University, Munich, Germany
| | - L. Higham
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, UK
| | - C. Hepples
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, UK
| | - P. Waddell
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, UK
| | - K. Karaghiosoff
- Department of Chemistry, Ludwig-Maximilian University, Munich, Germany
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11
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Hirscher NA, Perez Sierra D, Agapie T. Robust Chromium Precursors for Catalysis: Isolation and Structure of a Single-Component Ethylene Tetramerization Precatalyst. J Am Chem Soc 2019; 141:6022-6029. [PMID: 30871318 DOI: 10.1021/jacs.9b01387] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have introduced a new class of stable organometallic Cr reagents (compounds 1-4) that are readily prepared, yet reactive enough to serve as precursors. They were used for ethylene tetramerization catalysis following stoichiometric activation by in situ protonation. This study highlights the importance of balancing stability with reactivity in generating an organometallic precursor that is useful in catalysis. Moreover, precursor 4 allowed for the isolation and crystallographic characterization of a room-temperature stable cationic species, (PNP)CrR2+ (R = o-C6H4(CH2)2OMe, PNP = iPrN(PPh2)2). This complex (5) may be used as a single component precatalyst, without any alkylaluminum reagents. This result provides an unprecedented level of insight into the kind of structures that must be produced from more complicated activation processes.
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Affiliation(s)
- Nathanael A Hirscher
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard , MC 127-72, Pasadena , California 91125 , United States
| | - Danny Perez Sierra
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard , MC 127-72, Pasadena , California 91125 , United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering , California Institute of Technology , 1200 East California Boulevard , MC 127-72, Pasadena , California 91125 , United States
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12
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Propene oligomerisation at ambient temperature with [Cp(C5H4SiMe2tol)ZrMe2] (Cp = C5H5; tol = p-C6H5Me). Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Switching from Ethylene Trimerization to Ethylene Polymerization by Chromium Catalysts Bearing SNS Tridentate Ligands: Process Optimization Using Response Surface Methodology. Catal Letters 2018. [DOI: 10.1007/s10562-018-2571-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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14
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Zheng Q, Zheng D, Han B, Liu S, Li Z. Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization. Dalton Trans 2018; 47:13459-13465. [PMID: 30183787 DOI: 10.1039/c8dt02834f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chromium-based complexes are among the most important catalysts in the field of ethylene polymerization and oligomerization. Heterogeneous Cr Phillips catalysts account for more than one-third of the commercialized high density polyethylene (HDPE). In this contribution, chromium complexes, LCrCl3 (Cr1-Cr4: L = 2,6-R1-4-R2-C6H2-N[double bond, length as m-dash]CH-C6H4-2-PPh2; Cr1: R1 = H, R2 = H; Cr2: R1 = Me, R2 = H; Cr3: R1 = iPr, R2 = H; Cr4: R1 = Ph2CH, R2 = iPr), have been synthesized and characterized by elemental analysis, ESI and IR spectroscopy. The molecular structures of Cr3 and Cr4 are defined by X-ray diffraction, revealing a distorted octahedral geometry around the chromium center in both structures. In the presence of an aluminum cocatalyst, complexes Cr1-Cr4 show moderate to high activities toward ethylene polymerization. The nature of the catalysts and various reaction conditions, such as the nature and the amount of cocatalyst, reaction time and temperature, are investigated in detail. The results show that the title complexes have good thermal stability and the substituents on the ligands significantly affect the catalytic properties. Particularly, complex Cr4 can produce HDPE with a high molecular weight up to 68.3 × 104 g mol-1 due to the suppression of the chain transfer/termination by the introduction of bulky Ph2CH groups.
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Affiliation(s)
- 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, China.
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15
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Varga V, Pinkas J, Císařová I, Kubišta J, Horáček M, Mach K, Gyepes R. Chromocene-Cyclopentadienyltitanium Trichloride Ion Pairs and Their Rearrangement to Titanocene Chloride-Cyclopentadienylchromium Dichlorides - Ethylene Polymerization Tests. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Vojtech Varga
- J. Heyrovský Institute of Physical Chemistry; Academy of Sciences of the Czech Republic; v.v.i., Dolejškova 3 182 23 Prague 8 Czech Republic
| | - Jiří Pinkas
- J. Heyrovský Institute of Physical Chemistry; Academy of Sciences of the Czech Republic; v.v.i., Dolejškova 3 182 23 Prague 8 Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry; Charles University; Hlavova 2030 128 40 Prague 2 Czech Republic
| | - Jiří Kubišta
- J. Heyrovský Institute of Physical Chemistry; Academy of Sciences of the Czech Republic; v.v.i., Dolejškova 3 182 23 Prague 8 Czech Republic
| | - Michal Horáček
- J. Heyrovský Institute of Physical Chemistry; Academy of Sciences of the Czech Republic; v.v.i., Dolejškova 3 182 23 Prague 8 Czech Republic
| | - Karel Mach
- J. Heyrovský Institute of Physical Chemistry; Academy of Sciences of the Czech Republic; v.v.i., Dolejškova 3 182 23 Prague 8 Czech Republic
| | - Róbert Gyepes
- J. Heyrovský Institute of Physical Chemistry; Academy of Sciences of the Czech Republic; v.v.i., Dolejškova 3 182 23 Prague 8 Czech Republic
- Department of Inorganic Chemistry; Charles University; Hlavova 2030 128 40 Prague 2 Czech Republic
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16
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Malysheva SF, Belogorlova NA, Kuimov VA, Litvintsev YI, Sterkhova IV, Albanov AI, Gusarova NK, Trofimov BA. PCl 3 - and organometallic-free synthesis of tris(2-picolyl)phosphine oxide from elemental phosphorus and 2-(chloromethyl)pyridine hydrochloride. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.01.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Hirscher NA, Agapie T. Stoichiometrically Activated Catalysts for Ethylene Tetramerization using Diphosphinoamine-Ligated Cr Tris(hydrocarbyl) Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00706] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nathanael A. Hirscher
- Division of Chemistry and Chemical
Engineering, California Institute of Technology, 1200 East California Boulevard MC
127-72, Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and Chemical
Engineering, California Institute of Technology, 1200 East California Boulevard MC
127-72, Pasadena, California 91125, United States
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18
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Liu R, Zhu K, Zhong X, Li J, Liu Z, Chen S, Zhu H. Chromium complexes bearing amidinato-phosphino ligand: synthesis, characterization, and catalytic properties of ethylene tri-/tetramerization and polymerization. Dalton Trans 2016; 45:17020-17029. [PMID: 27711770 DOI: 10.1039/c6dt03216h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
An amidinato-phosphino ligand ArN[double bond, length as m-dash]C(R)NH(o-Ph2PC6H4) (Ar = 2,4,6-Me3C6H2, R = Ph (1); Ar = 2,6-iPr2C6H3, R = Ph (2); Ar = 2,6-iPr2C6H3, R = tBu (3)) was prepared. The ligand reacted with CrCl3(THF)3 to yield the N,P-chelation complex [ArNHC(R)[double bond, length as m-dash]N(o-Ph2PC6H4)]CrCl3(THF) (4-6), and the ligand's lithium salt ArN[double bond, length as m-dash]C(R)N(o-Ph2PC6H4)Li reacted with the respective CrCl3(THF)3 and CrCl2(THF)2 to give the N,N,P-chelation complexes [ArN[double bond, length as m-dash]C(R)N(o-Ph2PC6H4)]CrCl2(THF) (7-8) and {[ArN[double bond, length as m-dash]C(R)N(o-Ph2PC6H4)]Cr(μ-Cl)}2 (9-11). Complexes 1-11 were characterized by IR, NMR (for 1-3), EPR (for 4-11) spectroscopy and CHN elemental analysis, of which 3, 5, 8, and 11 were further studied by X-ray crystallography. Upon activation with an organoaluminum cocatalyst, complexes 4-6 were all catalytically active in ethylene tri-/tetramerization along with ethylene polymerization, and complexes 7-11 functioned as well but in ethylene polymerization. The correlation between the structure and the catalytic properties of the catalyst system is discussed.
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Affiliation(s)
- Rui Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
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19
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Simler T, Braunstein P, Danopoulos AA. Chromium(II) Pincer Complexes with Dearomatized PNP and PNC Ligands: A Comparative Study of Their Catalytic Ethylene Oligomerization Activity. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00685] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas Simler
- Laboratoire
de Chimie de Coordination, Institut de Chimie (UMR 7177
CNRS) and ‡Institute for Advanced Study (USIAS), Université de Strasbourg, Strasbourg CEDEX 67081, France
| | - Pierre Braunstein
- Laboratoire
de Chimie de Coordination, Institut de Chimie (UMR 7177
CNRS) and ‡Institute for Advanced Study (USIAS), Université de Strasbourg, Strasbourg CEDEX 67081, France
| | - Andreas A. Danopoulos
- Laboratoire
de Chimie de Coordination, Institut de Chimie (UMR 7177
CNRS) and ‡Institute for Advanced Study (USIAS), Université de Strasbourg, Strasbourg CEDEX 67081, France
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20
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Luo W, Li A, Liu S, Ye H, Li Z. 2-Benzimidazol-6-pyrazol-pyridine Chromium(III) Trichlorides: Synthesis, Characterization, and Application for Ethylene Oligomerization and Polymerization. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00573] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wenlong Luo
- School
of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
- State
Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, P. R. China
| | - Antai Li
- Department
of Chemistry and Engineering, Central South University, Changsha 410083, P. R. China
| | - Shaofeng Liu
- School
of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
- State
Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, P. R. China
| | - Hongqi Ye
- Department
of Chemistry and Engineering, Central South University, Changsha 410083, P. R. China
| | - Zhibo Li
- School
of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
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21
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Fliedel C, Ghisolfi A, Braunstein P. Functional Short-Bite Ligands: Synthesis, Coordination Chemistry, and Applications of N-Functionalized Bis(diaryl/dialkylphosphino)amine-type Ligands. Chem Rev 2016; 116:9237-304. [PMID: 27456550 DOI: 10.1021/acs.chemrev.6b00153] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this review is to highlight how the diversity generated by N-substitution in the well-known short-bite ligand bis(diphenylphosphino)amine (DPPA) allows a fine-tuning of the ligand properties and offers a considerable scope for tailoring the properties and applications of their corresponding metal complexes. The various N-substituents include nitrogen-, oxygen-, phosphorus-, sulfur-, halogen-, and silicon-based functionalities and directly N-bound metals. Multiple DPPA-type ligands linked through an organic spacer and N-functionalized DRPA-type ligands, in which the PPh2 substituents are replaced by PR2 (R = alkyl, benzyl) groups, are also discussed. Owing to the considerable diversity of N-functionalized DPPA-type ligands available, the applications of their mono- and polynuclear metal complexes are very diverse and range from homogeneous catalysis with well-defined or in situ generated (pre)catalysts to heterogeneous catalysis and materials science. In particular, sustained interest for DPPA-type ligands has been motivated, at least in part, by their ability to promote selective ethylene tri- or tetramerization in combination with chromium. Ligands and metal complexes where the N-substituent is a pure hydrocarbon group (as opposed to N-functionalization) are outside the scope of this review. However, when possible, a comparison between the catalytic performances of N-functionalized systems with those of their N-substituted analogs will be provided.
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Affiliation(s)
- Christophe Fliedel
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université de Strasbourg , 4 Rue Blaise Pascal, CS 90032, 67081 Strasbourg, France.,Laboratoire de Chimie de Coordination (LCC), CNRS-UPR 8241, 205 Route de Narbonne, Toulouse F-31077 Cedex 4, France
| | - Alessio Ghisolfi
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université de Strasbourg , 4 Rue Blaise Pascal, CS 90032, 67081 Strasbourg, France
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université de Strasbourg , 4 Rue Blaise Pascal, CS 90032, 67081 Strasbourg, France
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22
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Hettstedt C, Unglert M, Mayer RJ, Frank A, Karaghiosoff K. Methoxyphenyl Substituted Bis(picolyl)phosphines and Phosphine Oxides. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Christina Hettstedt
- Department of Chemistry, Ludwig‐Maximilians University (LMU), Butenandtstrasse 5–13 (Haus D), 81377 Munich, Germany, http://www.cup.uni‐muenchen.de
| | - Martin Unglert
- Department of Chemistry, Ludwig‐Maximilians University (LMU), Butenandtstrasse 5–13 (Haus D), 81377 Munich, Germany, http://www.cup.uni‐muenchen.de
| | - Robert J. Mayer
- Department of Chemistry, Ludwig‐Maximilians University (LMU), Butenandtstrasse 5–13 (Haus D), 81377 Munich, Germany, http://www.cup.uni‐muenchen.de
| | - Anna Frank
- Max‐Planck‐Institut für Eisenforschung, Max‐Planck‐Str. 1, 40237 Düsseldorf, Germany, http://www.mpie.de/
| | - Konstantin Karaghiosoff
- Department of Chemistry, Ludwig‐Maximilians University (LMU), Butenandtstrasse 5–13 (Haus D), 81377 Munich, Germany, http://www.cup.uni‐muenchen.de
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23
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Ai P, Danopoulos AA, Braunstein P. N-Phosphanyl- and N,N′-Diphosphanyl-Substituted N-Heterocyclic Carbene Chromium Complexes: Synthesis, Structures, and Catalytic Ethylene Oligomerization. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00547] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pengfei Ai
- Laboratoire de Chimie
de Coordination, Institut de
Chimie (UMR 7177 CNRS), and ‡Institute for Advanced Study, USIAS, Université de Strasbourg, 4 rue Blaise Pascal, 67081 Strasbourg Cedex, France
| | - Andreas A. Danopoulos
- Laboratoire de Chimie
de Coordination, Institut de
Chimie (UMR 7177 CNRS), and ‡Institute for Advanced Study, USIAS, Université de Strasbourg, 4 rue Blaise Pascal, 67081 Strasbourg Cedex, France
| | - Pierre Braunstein
- Laboratoire de Chimie
de Coordination, Institut de
Chimie (UMR 7177 CNRS), and ‡Institute for Advanced Study, USIAS, Université de Strasbourg, 4 rue Blaise Pascal, 67081 Strasbourg Cedex, France
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24
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Fliedel C, Rosa V, Falceto A, Rosa P, Alvarez S, Braunstein P. Unsymmetrical Chelation of N-Thioether-Functionalized Bis(diphenylphosphino)amine-Type Ligands and Substituent Effects on the Nuclearity of Iron(II) Complexes: Structures, Magnetism, and Bonding. Inorg Chem 2015; 54:6547-59. [DOI: 10.1021/acs.inorgchem.5b00834] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christophe Fliedel
- Laboratoire de Chimie de Coordination,
Institut de Chimie, UMR 7177 CNRS, Université de Strasbourg, 4 rue
Blaise Pascal, 67081 Strasbourg Cedex, France
| | - Vitor Rosa
- Laboratoire de Chimie de Coordination,
Institut de Chimie, UMR 7177 CNRS, Université de Strasbourg, 4 rue
Blaise Pascal, 67081 Strasbourg Cedex, France
| | - Andrés Falceto
- Departament de Química
Inorgànica and Institut de Química Teòrica i
Computacional, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Patrick Rosa
- CNRS, Université de Bordeaux, ICMCB (UPR 9048), 87 avenue du Dr. A. Schweitzer, 33600 Pessac, France
| | - Santiago Alvarez
- Departament de Química
Inorgànica and Institut de Química Teòrica i
Computacional, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination,
Institut de Chimie, UMR 7177 CNRS, Université de Strasbourg, 4 rue
Blaise Pascal, 67081 Strasbourg Cedex, France
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25
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Tromp M. Catalysis seen in action. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2013.0152. [PMID: 25624518 DOI: 10.1098/rsta.2013.0152] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Synchrotron radiation techniques are widely applied in materials research and heterogeneous catalysis. In homogeneous catalysis, its use so far is rather limited despite its high potential. Here, insights in the strengths and limitations of X-ray spectroscopy technique in the field of homogeneous catalysis are given, including new technique developments. A relevant homogeneous catalyst, used in the industrially important selective oligomerization of ethene, is taken as a worked-out example. Emphasis is placed on time-resolved operando X-ray absorption spectroscopy with outlooks to novel high energy resolution and emission techniques. All experiments described have been or can be done at the Diamond Light Source Ltd (Didcot, UK).
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Affiliation(s)
- Moniek Tromp
- Characterisation in Catalysis, Department of Chemistry, Catalysis Research Center, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching bei München, Germany
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26
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Jin G, Vendier L, Coppel Y, Sabo-Etienne S, Bontemps S. Three bonding modes of bis(2-picolyl)phenylphosphine at iron: isolation of a dinuclear iron complex featuring dearomatized pyridine moieties. Dalton Trans 2015; 44:7500-5. [DOI: 10.1039/c5dt00537j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three iron complexes displaying different coordination modes of the NPN ligand were isolated, including one dinuclear compound featuring dearomatized pyridine moieties.
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Affiliation(s)
- G. Jin
- CNRS
- LCC (Laboratoire de Chimie de Coordination)
- F-31077 Toulouse Cedex 4
- France
- Université de Toulouse
| | - L. Vendier
- CNRS
- LCC (Laboratoire de Chimie de Coordination)
- F-31077 Toulouse Cedex 4
- France
- Université de Toulouse
| | - Y. Coppel
- CNRS
- LCC (Laboratoire de Chimie de Coordination)
- F-31077 Toulouse Cedex 4
- France
- Université de Toulouse
| | - S. Sabo-Etienne
- CNRS
- LCC (Laboratoire de Chimie de Coordination)
- F-31077 Toulouse Cedex 4
- France
- Université de Toulouse
| | - S. Bontemps
- CNRS
- LCC (Laboratoire de Chimie de Coordination)
- F-31077 Toulouse Cedex 4
- France
- Université de Toulouse
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27
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Zhang S, Pattacini R, Braunstein P, De Cola L, Plummer E, Mauro M, Gourlaouen C, Daniel C. Synthesis, structure, and optical properties of Pt(II) and Pd(II) complexes with oxazolyl- and pyridyl-functionalized DPPM-type ligands: a combined experimental and theoretical study. Inorg Chem 2014; 53:12739-56. [PMID: 25420195 DOI: 10.1021/ic501566u] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
New square-planar complexes [Pt(1(-H))2] (2a) [1(-H) = (oxazolin-2-yl)bis(diphenylphosphino)methanide] and [Pd(1(-H))2] (2b), of general formula [M{(Ph2P)2C---C---NCH2CH2O}2] (M = Pt, 2a; M = Pd, 2b), result from deprotonation of 2-{bis(diphenylphosphino)methyl}oxazoline (1) at the PCHP site. The new, functionalized dppm-type ligand 4-{bis(diphenylphosphino)methyl}pyridine, (Ph2P)2CH(4-C5H4N) (4), was prepared by double lithiation and phosphorylation of 4-picoline. In the presence of NEt3, the reactions of 2 equiv of 4 with [PtCl2(NCPh)2] and [Pd(acac)2] (acac = acetylacetonate) afforded [Pt(4(-H))2] (5a) [4(-H) = bis(diphenylphosphino)(pyridin-4-yl)methanide] and [Pd(4(-H))2] (5b), of general formula [M{(Ph2P)2C(4-C5H4N)}2] (M = Pt, 5a; M = Pd, 5b), respectively. In the absence of base, the reactions of 2 equiv of 4 with [PtCl2(NCPh)2] and [PdCl2(NCPh)2] afforded (5a·2HCl) (6a) and (5b·2HCl) (6b), respectively, in which the PCHP proton of 4 has migrated from carbon to nitrogen to give a pyridinium derivative of general formula [M{(Ph2P)2C(4-C5H4NH)}2]Cl2 (M = Pt, 6a; M = Pd, 6b). The complexes 3a, 5a·2MeOH, and 6b·4CH2Cl2 have been structurally characterized by X-ray diffraction. The absorption/emission properties of the Pt(II) complexes 2a and 5a and the Pd(II) complexes 2b and 5b have been investigated by UV-vis spectroscopy and theoretical analysis based on density functional theory. The UV-vis absorption spectra of the neutral complexes recorded in dilute N,N'-dimethylformamide solutions are dominated by intense spin-allowed intraligand transitions in the region below 350 nm. The complexes exhibit charge-transfer bands between 350 and 500 nm. The experimental and theoretical absorption spectra agree qualitatively and point to two low-lying ligand-to-metal charge transfer states that contribute to the bands observed between 350 and 500 nm. The complexes are emissive in frozen solutions at 77 K, in the pure solid state, and when doped into films of poly(methyl methacrylate) but are nonemissive in solution. A red shift is observed when Pt(II) is replaced by Pd(II).
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Affiliation(s)
- Shuanming Zhang
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS/UdS), Université de Strasbourg , 4 rue Blaise Pascal, F-67081 Strasbourg, France
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28
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Synthesis and characterization of novel chromium complexes based on β-enaminoketonato ligands and their application to ethylene polymerization. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2014.07.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Liu S, Motta A, Mouat AR, Delferro M, Marks TJ. Very Large Cooperative Effects in Heterobimetallic Titanium-Chromium Catalysts for Ethylene Polymerization/Copolymerization. J Am Chem Soc 2014; 136:10460-9. [DOI: 10.1021/ja5046742] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shaofeng Liu
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Alessandro Motta
- Dipartimento
di Scienze Chimiche, Università di Catania and INSTM, UdR
Catania, 95125 Catania, Italy
| | - Aidan R. Mouat
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Massimiliano Delferro
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Tobin J. Marks
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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30
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Yankey M, Obuah C, Darkwa J. Phenoxysalicylaldimine-Bearing Chromium(III) Precatalysts for Ethylene Polymerization. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400223] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Margaret Yankey
- Department of Chemistry; University of Johannesburg; Kingsway Campus, Auckland Park Johannesburg 2006 South Africa
| | - Collins Obuah
- Department of Chemistry; University of Johannesburg; Kingsway Campus, Auckland Park Johannesburg 2006 South Africa
| | - James Darkwa
- Department of Chemistry; University of Johannesburg; Kingsway Campus, Auckland Park Johannesburg 2006 South Africa
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31
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Alzamly A, Gambarotta S, Korobkov I. Synthesis, Structures, and Ethylene Oligomerization Activity of Bis(phosphanylamine)pyridine Chromium/Aluminate Complexes. Organometallics 2013. [DOI: 10.1021/om4008289] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ahmed Alzamly
- Department
of Chemistry, University of Ottawa, 10 M. Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Sandro Gambarotta
- Department
of Chemistry, University of Ottawa, 10 M. Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Ilia Korobkov
- Department
of Chemistry, University of Ottawa, 10 M. Curie, Ottawa, Ontario K1N 6N5, Canada
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32
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Whiteoak CJ, Nobbs JD, Kiryushchenkov E, Pagano S, White AJP, Britovsek GJP. Tri(pyridylmethyl)phosphine: the elusive congener of TPA shows surprisingly different coordination behavior. Inorg Chem 2013; 52:7000-9. [PMID: 23701515 DOI: 10.1021/ic4005196] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Tri(pyridylmethyl)phosphine (TPPh), the remarkably elusive congener of tri(pyridylmethyl)amine (TPA), has been prepared, as well as the relative tri(N-methyl-pyridylamino)phosphine (TPAMP). The coordination properties of these new ligands have been evaluated for chromium(III), iron(II), and ruthenium(II) complexes and compared with the related TPA complexes. In all cases, a different coordination behavior has been observed whereby TPPh and TPAMP always act as tridentate ligands. A chromium(III) complex [Cr(TPPh)Cl3] has been prepared, which has shown low ethylene oligomerization activity. Octahedral low spin iron(II) complexes [Fe(TPPh)2](2+) and [Fe(TPAMP)2](2+) were obtained with two ligands bound to the metal center. Ruthenium(II) chloro complexes of TPA and TPPh undergo ligand exchange reactions in acetonitrile, and the ruthenium(II) complex [Ru(MeCN)2(TPA)](2+) can be oxidized by m-CPBA in acetonitrile to give a transient ruthenium(IV) oxo complex [Ru(O)(MeCN)(TPA)](2+). Attempts to generate high valent ruthenium(IV) oxo TPPh or TPAMP complexes could not be achieved, probably due to insufficient stabilization by these strong field ligands.
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Affiliation(s)
- Christopher J Whiteoak
- Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AY, United Kingdom
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33
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Monillas WH, Young JF, Yap GPA, Theopold KH. A well-defined model system for the chromium-catalyzed selective oligomerization of ethylene. Dalton Trans 2013; 42:9198-210. [PMID: 23493916 DOI: 10.1039/c3dt00109a] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Wesley H Monillas
- Department of Chemistry and Biochemistry, Center for Catalytic Science and Technology, University of Delaware, Newark, Delaware 19716, USA
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34
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Ardizzoia GA, Brenna S, Durini S, Therrien B. Ruthenium(II) Complexes Bearing a Ligand Derived from P,N- or P,N,O-Diphenylphosphinobenzoxazine: Synthesis, X-ray Characterization, and cis Diastereoselectivity in Styrene Cyclopropanation. Organometallics 2012. [DOI: 10.1021/om300434u] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- G. Attilio Ardizzoia
- Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria,
Via Valleggio, 11, 22100 Como, Italy
| | - Stefano Brenna
- Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria,
Via Valleggio, 11, 22100 Como, Italy
| | - Sara Durini
- Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria,
Via Valleggio, 11, 22100 Como, Italy
| | - Bruno Therrien
- Institute of Chemistry, Université de Neuchâtel, Ave de Bellevaux 51, CH-2000 Neuchâtel,
Switzerland
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35
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Hasanayn F, Achord P, Braunstein P, Magnier HJ, Krogh-Jespersen K, Goldman AS. Theoretical Structure–Reactivity Study of Ethylene Insertion into Nickel–Alkyl Bonds. A Kinetically Significant and Unanticipated Role of trans Influence in Determining Agostic Bond Strengths. Organometallics 2012. [DOI: 10.1021/om300001n] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Faraj Hasanayn
- Department
of Chemistry, The American University of Beirut, Beirut, Lebanon
| | - Patrick Achord
- Department of
Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick,
New Jersey 08903, United States
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université de Strasbourg, F-67081
Strasbourg Cédex, France
| | | | - Karsten Krogh-Jespersen
- Department of
Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick,
New Jersey 08903, United States
| | - Alan S. Goldman
- Department of
Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick,
New Jersey 08903, United States
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36
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Schweinfurth D, Su CY, Wei SC, Braunstein P, Sarkar B. Nickel complexes with “click”-derived pyridyl-triazole ligands: weak intermolecular interactions and catalytic ethylene oligomerisation. Dalton Trans 2012; 41:12984-90. [DOI: 10.1039/c2dt31805a] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Bartlett SA, Wells PP, Nachtegaal M, Dent AJ, Cibin G, Reid G, Evans J, Tromp M. Insights in the mechanism of selective olefin oligomerisation catalysis using stopped-flow freeze-quench techniques: A Mo K-edge QEXAFS study. J Catal 2011. [DOI: 10.1016/j.jcat.2011.10.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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