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Al-Harbi A, Hammond MJ, Parkin G. Organometallic Zirconium Compounds in an Oxygen-Rich Coordination Environment: Synthesis and Structural Characterization of Tris(oxoimidazolyl)hydroboratozirconium Compounds. Inorg Chem 2018; 57:1426-1437. [PMID: 29314851 DOI: 10.1021/acs.inorgchem.7b02832] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of tris(oxoimidazolyl)hydroborato ligands, which serve as L2X [O3] donors, have been employed to obtain organometallic zirconium compounds in an uncommon oxygen-rich coordination environment. For example, Cp[ToMeBenz]ZrCl2 has been synthesized via the reaction of [ToMeBenz]Na with CpZrCl3 and bears a structural resemblance to the bent metallocene dichloride derivative Cp2ZrCl2. In addition, the half-sandwich counterparts [ToMeBenz]ZrCl3 and [ToBut]ZrCl3 have been obtained by metathesis of ZrCl4 with [ToMeBenz]Na and [ToBut]Na, respectively. The structurally related zirconium benzyl compounds [ToRBenz]Zr(CH2Ph)3 (R = Me, But, 1-Ad) have also been synthesized via the reactions of [ToRBenz]Tl with Zr(CH2Ph)4, and X-ray diffraction studies demonstrate that the benzyl ligands in these compounds are conformationally flexible and exhibit a large range of Zr-CH2-Ph bond angles (94.7-131.7°). Protolytic cleavage of one of the benzyl ligands of [ToRBenz]Zr(CH2Ph)3 (R = But, 1-Ad) may be achieved by treatment with [PhNHMe2][B(C6F5)4] to generate {[ToRBenz]Zr(CH2Ph)2}[B(C6F5)4], which are catalysts for the polymerization of ethylene. The molecular structure of the ether adduct, {[ToButBenz]Zr(CH2Ph)2(OEt2)}[B(C6F5)4], has been determined by X-ray diffraction. In addition to the use of tris(oxoimidazolyl)hydroborato ligands, bis(oxoimidazolyl)hydroborato ligands have also been used to obtain zirconium benzyl compounds in oxygen-rich environments, namely, [BoMeBenz]2Zr(CH2Ph)2 and [BoAdBenz]2Zr(CH2Ph)2.
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Affiliation(s)
- Ahmed Al-Harbi
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Matthew J Hammond
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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Liu CC, Chan MCW. Chelating σ-Aryl Post-Metallocenes: Probing Intramolecular [C-H···F-C] Interactions and Unusual Reaction Pathways. Acc Chem Res 2015; 48:1580-90. [PMID: 25993345 DOI: 10.1021/acs.accounts.5b00008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Our interest in chelating σ-aryl ancillary ligands was motivated by their potential to impart unusual reactivity, since we envisioned that σ-donors with minimal π-donation would create a catalytic center with enhanced electrophilicity. We developed a family of Group 4 post-metallocene catalysts supported by pyridine-2-phenolate-6-(σ-aryl) [O,N,C] ligands bearing a fluorinated moiety in the vicinity of the metal. Notable features of these meta-substituted tris(hetero)aryl frameworks include their coordination geometry and inherent rigidity. For the first time, the elusive C-H···F-C interaction was manifested as NMR-discernible (1)H-(19)F coupling in solution and characterized by a neutron diffraction study. Their existence carries implications for catalyst design and in the context of weak attractive ligand-polymer interactions (WALPI), since they substantiate the practical viability of the ortho-F···H(β) ligand-polymer interactions proposed for living Group 4 fluorinated bis(phenoxyimine) catalysts. In metal-catalyzed olefin polymerization reactions, the notion of noncovalent interactions between an active ancillary ligand and the growing polymer chain is new. These interactions must be fragile and transient in nature, otherwise the intrinsic chain propagation process would be disrupted, and inherently tunable attractive forces such as hydrogen bonds are ideally suited to this role. The nature, relevance, and usability of extremely weak hydrogen bonds such as C-H···F-C has been a topical yet controversial area of research. We subsequently prepared a series of Group 4 complexes supported by fluorinated (σ-aryl)-2-phenolate-6-pyridyl [O,C,N] ligands. [(1)H,(19)F]-HMBC NMR experiments were conducted to probe the observed (1)H-(19)F coupling, and specifically separate contributions from scalar (J) coupling and cross-correlation (CR) interference. For the first time, a significant scalar component was confirmed for the (1)H-(19)F coupling in Ti-[O,C,N] and [O,N,C] complexes, which occurs with chemical connectivity across intramolecular C-H···F-C interactions. This result is important because the applicability of weak attractive ligand-polymer interactions in catalysis is feasible only if the observed coupling and hence the noncovalent interaction is genuine. The verified intramolecular C-H···F-C contacts in these complexes can therefore be considered as synthetic models for ligand-polymer interactions in olefin polymerization processes. Significantly, reports concerning late transition metal systems have appeared that hint at the generality of the WALPI concept for modulating polymerization reactions. We evaluated the olefin polymerization reactivity of Ti-[O,N,C] catalysts through judicious substitution. DFT calculations, which revealed diverse kinetically competitive reaction pathways and active sites (including unusual ethylene-assimilated species) in addition to normal chain propagation, were also employed to rationalize polymerization efficiencies. Further developments in catalytic applications of multidentate σ-aryl ligand systems and novel reactivity of the corresponding complexes can be envisaged.
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Affiliation(s)
- Cham-Chuen Liu
- Department of Biology and
Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Michael C. W. Chan
- Department of Biology and
Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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Alves LG, Madeira F, Munhá RF, Barroso S, Veiros LF, Martins AM. Reactions of heteroallenes with cyclam-based Zr(IV) complexes. Dalton Trans 2015; 44:1441-55. [PMID: 25427676 DOI: 10.1039/c4dt02851a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work describes reactions of heteroallenes with diamido-diamine cyclam-based Zr(iv) complexes of the general formula (Bn2Cyclam)ZrX2 (X = O(t)Bu, , O(i)Pr, , SPh, , NH(t)Bu, ) as well as the di-orthometallated species ((C6H4CH2)2Cyclam)Zr, . The reactions of isocyanates or isothiocyanates with , or resulted in the formation of N-bonded ureate or thioureate cyclam complexes upon [2 + 2] cycloaddition of the Zr-Namido bonds of the cyclam to the heteroallene (). DFT calculations showed that κ(2)-N,N'-ureate bonding is favoured over κ(2)-N,O-ureates, which in turn may be formed in reactions with bulky isocyanates as 1-naphthyl isocyanate (NpN[double bond, length as m-dash]C[double bond, length as m-dash]O). The reactions of with N,N'-cyclohexylcarbodiimide (CyN[double bond, length as m-dash]C[double bond, length as m-dash]NCy) and carbon disulfide afforded guanidinate and dithiocarbamate fragments, respectively, appended to one of the nitrogen atoms of the cyclam ligand. These reactions represent a reliable method for the synthesis of asymmetrically N-functionalized cyclams giving rise to C1 symmetry Zr(iv) species by addition of one equivalent of heteroallenes. The reaction of (Bn2Cyclam)Zr(NH(t)Bu)2, , with one equivalent of mesityl isocyanate (MesN[double bond, length as m-dash]C[double bond, length as m-dash]O) also proceeds through insertion, involving one Zr-NH(t)Bu bond. However, it was observed that the reaction of (Bn2Cyclam)Zr(NH(t)Bu)2, , with MesN[double bond, length as m-dash]C[double bond, length as m-dash]O follows a different path if the reaction is carried out at 60 °C. In this case the reaction leads to [2 + 2] addition of the Zr-Ncyclam bond to the isocyanate, with a concomitant occurrence of orthometallation of the one benzyl pending group of the cyclam ring. The reaction of (t)BuN[double bond, length as m-dash]C[double bond, length as m-dash]O with the di-orthometallated complex ((C6H4CH2)2Cyclam)Zr, , also gave a κ(2)-N,N'-ureate fragment, by isocyanate addition to the macrocycle. DFT calculations on these systems were conducted in an attempt to rationalise the reactivity patterns observed.
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Affiliation(s)
- Luis G Alves
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal.
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Lo JCY, Chan MCW, Lo PK, Lau KC, Ochiai T, Makio H. Olefin Polymerization Behavior of Titanium(IV) Pyridine-2-phenolate-6-(σ-aryl) Catalysts: Impact of “py-Adjacent” and Phenolate Substituents. Organometallics 2013. [DOI: 10.1021/om300832q] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jerry C. Y. Lo
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong, People’s Republic of China
| | - Michael C. W. Chan
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong, People’s Republic of China
| | - Po-Kam Lo
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong, People’s Republic of China
| | - Kai-Chung Lau
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong, People’s Republic of China
| | - Takashi Ochiai
- R&D Center, Mitsui Chemicals, Inc., 580-32 Nagaura, Sodegaura, Chiba 299-0265, Japan
| | - Haruyuki Makio
- Mitsui Chemicals Singapore R&D Centre Pte. Ltd., 50 Science Park Road, #06-08 The Kendall Singapore Science Park II, Singapore 117406
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Luconi L, Rossin A, Tuci G, Tritto I, Boggioni L, Klosin JJ, Theriault CN, Giambastiani G. Facing Unexpected Reactivity Paths with ZrIV-Pyridylamido Polymerization Catalysts. Chemistry 2011; 18:671-87. [DOI: 10.1002/chem.201102194] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Indexed: 11/11/2022]
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Bareš J, Padělková Z, Meunier P, Pirio N, Poinsot D, Růžička A. C,N-chelated dicyclopentadienylzirconium complexes and their possible use as hydrogenation catalysts. INORG CHEM COMMUN 2010. [DOI: 10.1016/j.inoche.2010.08.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zhang J, Krause JA, Huang KW, Guan H. Ancillary Ligand and Ketone Substituent Effects on the Rate of Ketone Insertion into Zr−C Bonds of Zirconocene−1-Aza-1,3-diene Complexes. Organometallics 2009. [DOI: 10.1021/om900142c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jie Zhang
- Departments of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, and National University of Singapore, Singapore 117543
| | - Jeanette A. Krause
- Departments of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, and National University of Singapore, Singapore 117543
| | - Kuo-Wei Huang
- Departments of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, and National University of Singapore, Singapore 117543
| | - Hairong Guan
- Departments of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, and National University of Singapore, Singapore 117543
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Marquet N, Kirillov E, Roisnel T, Razavi A, Carpentier JF. Group 4 Metal Complexes of Fluorous (Di)Alkoxide-(Di)Imino Ligands: Synthesis, Structure, Olefin Polymerization Catalysis, and Decomposition Pathways. Organometallics 2009. [DOI: 10.1021/om8009409] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nicolas Marquet
- Catalysis and Organometallics, UMR 6226 Sciences Chimiques de Rennes, CNRS-University of Rennes 1, 35042 Rennes Cedex, France, and Total Petrochemicals Research, Zone Industrielle C, 7181 Feluy, Belgium
| | - Evgueni Kirillov
- Catalysis and Organometallics, UMR 6226 Sciences Chimiques de Rennes, CNRS-University of Rennes 1, 35042 Rennes Cedex, France, and Total Petrochemicals Research, Zone Industrielle C, 7181 Feluy, Belgium
| | - Thierry Roisnel
- Catalysis and Organometallics, UMR 6226 Sciences Chimiques de Rennes, CNRS-University of Rennes 1, 35042 Rennes Cedex, France, and Total Petrochemicals Research, Zone Industrielle C, 7181 Feluy, Belgium
| | - Abbas Razavi
- Catalysis and Organometallics, UMR 6226 Sciences Chimiques de Rennes, CNRS-University of Rennes 1, 35042 Rennes Cedex, France, and Total Petrochemicals Research, Zone Industrielle C, 7181 Feluy, Belgium
| | - Jean-François Carpentier
- Catalysis and Organometallics, UMR 6226 Sciences Chimiques de Rennes, CNRS-University of Rennes 1, 35042 Rennes Cedex, France, and Total Petrochemicals Research, Zone Industrielle C, 7181 Feluy, Belgium
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Long RJ, Jones DJ, Gibson VC, White AJP. Zirconium Complexes Containing Tetradentate O,P,P,O Ligands: Ethylene and Propylene Polymerization Studies. Organometallics 2008. [DOI: 10.1021/om800652w] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Richard J. Long
- Department of Chemistry, Imperial College London, Exhibition Road, London, U.K., SW7 2AZ
| | - David J. Jones
- Department of Chemistry, Imperial College London, Exhibition Road, London, U.K., SW7 2AZ
| | - Vernon C. Gibson
- Department of Chemistry, Imperial College London, Exhibition Road, London, U.K., SW7 2AZ
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Exhibition Road, London, U.K., SW7 2AZ
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Hu H, Gao H, Song K, Liu F, Long J, Zhang L, Zhu F, Wu Q. Novel bis(benzoin) titanium catalyst for homo- and copolymerization of norbornene with ethylene: Synthesis, characterization and catalytic properties. POLYMER 2008. [DOI: 10.1016/j.polymer.2008.08.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Fandos R, Fernández-Gallardo J, López-Solera MI, Otero A, Rodríguez A, Ruiz MJ, Terreros P. Preparation, Characterization, and Reactivity of Tantalum Complexes Containing Tridentate Bis(phenolato) [OSO]-Type Ligands. Organometallics 2008. [DOI: 10.1021/om8004838] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rosa Fandos
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Jacob Fernández-Gallardo
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - María Isabel López-Solera
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Ana Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - María José Ruiz
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Pilar Terreros
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Químicas, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
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Long RJ, Gibson VC, White AJP. Group 4 Metal Olefin Polymerization Catalysts Stabilized by Bidentate O,P Ligands. Organometallics 2007. [DOI: 10.1021/om7008149] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Richard J. Long
- Department of Chemistry, Imperial College London, Exhibition Road, London, U.K., SW7 2AZ
| | - Vernon C. Gibson
- Department of Chemistry, Imperial College London, Exhibition Road, London, U.K., SW7 2AZ
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Exhibition Road, London, U.K., SW7 2AZ
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Oulié P, Freund C, Saffon N, Martin-Vaca B, Maron L, Bourissou D. Enforced η1-Fluorenyl and Indenyl Coordination to Zirconium: Geometrically Constrained and Sterically Expanded Complexes Derived from the Bifunctional (FluPPh2NAr)− and (IndPPh2NAr)− Ligands. Organometallics 2007. [DOI: 10.1021/om700974g] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pascal Oulié
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599) Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, and Laboratoire de Physique et Chimie des Nanoobjets (UMR 5215), INSA, Université Paul Sabatier, 135, avenue de Rangueil, F-31077 Toulouse Cedex, France
| | - Christelle Freund
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599) Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, and Laboratoire de Physique et Chimie des Nanoobjets (UMR 5215), INSA, Université Paul Sabatier, 135, avenue de Rangueil, F-31077 Toulouse Cedex, France
| | - Nathalie Saffon
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599) Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, and Laboratoire de Physique et Chimie des Nanoobjets (UMR 5215), INSA, Université Paul Sabatier, 135, avenue de Rangueil, F-31077 Toulouse Cedex, France
| | - Blanca Martin-Vaca
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599) Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, and Laboratoire de Physique et Chimie des Nanoobjets (UMR 5215), INSA, Université Paul Sabatier, 135, avenue de Rangueil, F-31077 Toulouse Cedex, France
| | - Laurent Maron
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599) Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, and Laboratoire de Physique et Chimie des Nanoobjets (UMR 5215), INSA, Université Paul Sabatier, 135, avenue de Rangueil, F-31077 Toulouse Cedex, France
| | - Didier Bourissou
- Laboratoire Hétérochimie Fondamentale et Appliquée du CNRS (UMR 5069), Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, Structure Fédérative Toulousaine en Chimie Moléculaire (FR 2599) Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 09, France, and Laboratoire de Physique et Chimie des Nanoobjets (UMR 5215), INSA, Université Paul Sabatier, 135, avenue de Rangueil, F-31077 Toulouse Cedex, France
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Fandos R, Hernández C, Otero A, Pastor C, Terreros P, Aullón G, Alvarez S. Chelating Dialkoxide Titanium Complex: A Versatile Building Block for the Construction of Heterometallic Derivatives. Chemistry 2007; 13:2831-6. [PMID: 17171740 DOI: 10.1002/chem.200601480] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The heterometallic complex [TiCp*(O(2)Bz)(2)AlMe(2)] (2) has been synthesised by reaction of [TiCp*(O(2)Bz)(OBzOH)] (1) with AlMe(3) (Cp*=eta(5)-C(5)Me(5); Bz=benzyl). Complex 1 reacts with HOTf to yield the cationic derivative [TiCp*(OBzOH)(2)]OTf (3) (HOTf=HSO(3)CF(3)). Compound 3 reacts with [{M(mu-OH)(cod)}(2)] (M=Rh, Ir; cod=cyclooctadiene) to render the early-late heterometallic complexes [TiCp*(O(2)Bz)(2){M(cod)}(2)]OTf (M=Rh (4); Ir (5)). The molecular structure of complex 4 has been established by single-crystal X-ray diffraction studies.
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Affiliation(s)
- Rosa Fandos
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente. Avda. Carlos III s/n, 45071 Toledo, Spain.
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Day JK, Baghurst RE, Strevens RR, Light ME, Hursthouse MB, Stengel BF, Fallis IA, Aldridge S. Influence of ligand backbone flexibility in group 4 metal complexes of tetradentate mixed tertiary amine/alkoxide ligands. NEW J CHEM 2007. [DOI: 10.1039/b608680b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Organometallic complexes have long been known to display a wide variety of dynamic stereochemical processes. Classic examples of such processes include the exchange of axial and equatorial environments in trigonal bipyramidal complexes, such as Fe(CO)(5), and the migration of the metal moiety round the periphery of the cyclopentadiene ring in eta(1)-bound Cp complexes. The systematic study of fluxional processes is of interest because it can not only help provide a detailed, quantitative 'picture' of the bonding between the metals and ligands involved, but it can also help to rationalise chemical reactivity patterns. The introduction of chirality into organometallic complexes, usually in the form of a non-racemic chiral ligand, has led to an explosion in the importance such species, particularly with regard to their applications in organic functional group transformations. The presence of a chiral centre can also provide an excellent spectroscopic handle on the complex in question, enabling both novel fluxional processes to be observed and new light to be shed on old (unresolved) problems. In this critical review (101 references) the literature on metal-centred fluxional rearrangements in chiral transition and main group organometallic complexes is reviewed, complementing the recent review by Faller (see reference 8).
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Affiliation(s)
- Peter J Heard
- School of Biological and Chemical Sciences, Birkbeck University of London, Malet Street, London, WC1E 7HX, UK.
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17
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Kraft B, Huang KW, Cole A, Waymouth R. Synthesis, Structure, and Polymerization Activity of a Titanium Complex with a Chelating [(Hydroxy-κO)amino-κN]phenolato(2−)-κO Ligand. Helv Chim Acta 2006. [DOI: 10.1002/hlca.200690159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Bo C, Fandos R, Feliz M, Hernández C, Otero A, Rodríguez A, Ruiz MJ, Pastor C. fac versus mer Coordination for a Tridentate Diethylene Glyclolate Ligand in Tantalum Complexes: A Combined Experimental and Theoretical Study. Organometallics 2006. [DOI: 10.1021/om060254e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Carles Bo
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Rosa Fandos
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Marta Feliz
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Carolina Hernández
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - Ana Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - María José Ruiz
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
| | - César Pastor
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias del Medio Ambiente, Universidad de Castilla−La Mancha, Avenida Carlos III, s/n 45071 Toledo, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, Universidad de Castilla−La Mancha, Campus de Ciudad Real, 13071 Ciudad Real, Spain, Departamento de Química Inorgánica, Orgánica y Bioquímica, ETS Ingenieros Industriales, Universidad de Castilla−La Mancha, Avenida Camilo José Cela, 3, 13071 Ciudad
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19
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Chan MCW, Tam KH, Zhu N, Chiu P, Matsui S. Synthesis, Structures, and Olefin Polymerization Characteristics of Group 4 Catalysts [Zr{(OAr)2py}Cl2(D)] (D = O-Donors, Cl[HPR3]) Supported by Tridentate Pyridine-2,6-bis(aryloxide) Ligands. Organometallics 2006. [DOI: 10.1021/om050864z] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael C. W. Chan
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China, Department of Chemistry and HKU-CAS Joint Laboratory for New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China, and R&D Center, Mitsui Chemicals, Inc., 580-32 Nagaura, Sodegaura, Chiba 299-0265, Japan
| | - Ka-Ho Tam
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China, Department of Chemistry and HKU-CAS Joint Laboratory for New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China, and R&D Center, Mitsui Chemicals, Inc., 580-32 Nagaura, Sodegaura, Chiba 299-0265, Japan
| | - Nianyong Zhu
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China, Department of Chemistry and HKU-CAS Joint Laboratory for New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China, and R&D Center, Mitsui Chemicals, Inc., 580-32 Nagaura, Sodegaura, Chiba 299-0265, Japan
| | - Pauline Chiu
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China, Department of Chemistry and HKU-CAS Joint Laboratory for New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China, and R&D Center, Mitsui Chemicals, Inc., 580-32 Nagaura, Sodegaura, Chiba 299-0265, Japan
| | - Shigekazu Matsui
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China, Department of Chemistry and HKU-CAS Joint Laboratory for New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China, and R&D Center, Mitsui Chemicals, Inc., 580-32 Nagaura, Sodegaura, Chiba 299-0265, Japan
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20
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Fandos R, Gallego B, Otero A, Rodríguez A, Ruiz MJ, Terreros P, Pastor C. A new titanium building block for early–late heterometallic complexes; preparation of a new tetrameric metallomacrocycle by self assembly. Dalton Trans 2006:2683-90. [PMID: 16804580 DOI: 10.1039/b601544a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The new titanium dicarboxylate complex Cp*TiMe(OOC)2py (2) [Cp*=eta5-C5Me5; (OOC)2py = 2,6-pyridinedicarboxylate] has been synthesized. The reaction of complex 2 with water renders [Cp*Ti(OOC)2py]2O (3). The molecular structure of 3 has been studied by X-ray diffraction methods. Complex 2 reacts with isocyanides to yield the respective iminoacyl derivatives Cp*Ti(eta2-MeCNR)(OOC)2py [R=tBu (4), 2,6-dimethylphenyl (xylyl) (5)]. The molecular structure of complex4 has been established by X-ray diffraction. Compound 2 has been employed as a new building block for the preparation of new early-late heterometallic compounds; it reacts with [M(mu-OH)(COD)]2 (M = Rh, Ir) to give the corresponding tetranuclear metallomacrocycle derivatives [Cp*Ti{(OOC)(2)py}(mu-O)M(COD)]2 [M = Rh (6); Ir (7)]. The molecular structure of 6 has been established by X-ray diffraction.
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Affiliation(s)
- Rosa Fandos
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Avd. Carlos III, s/n, 45071, Toledo, Spain.
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21
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Lavanant L, Toupet L, Lehmann CW, Carpentier JF. Group 4 Metal Complexes of Nitrogen-Bridged Dialkoxide Ligands: Synthesis, Structure, and Polymerization Activity Studies. Organometallics 2005. [DOI: 10.1021/om0505817] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laurent Lavanant
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Max-Planck-Institut für Kohlenforschung, Chemical Crystallography, Postfach 101353, 45466 Mülheim/Ruhr, Germany
| | - Loic Toupet
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Max-Planck-Institut für Kohlenforschung, Chemical Crystallography, Postfach 101353, 45466 Mülheim/Ruhr, Germany
| | - Christian W. Lehmann
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Max-Planck-Institut für Kohlenforschung, Chemical Crystallography, Postfach 101353, 45466 Mülheim/Ruhr, Germany
| | - Jean-François Carpentier
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Max-Planck-Institut für Kohlenforschung, Chemical Crystallography, Postfach 101353, 45466 Mülheim/Ruhr, Germany
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22
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Lavanant L, Silvestru A, Faucheux A, Toupet L, Jordan RF, Carpentier JF. Electron-Deficient Group 4 Metal Complexes of Sulfur-Bridged Dialkoxide Ligands: Synthesis, Structure, and Polymerization Activity Studies. Organometallics 2005. [DOI: 10.1021/om050560c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laurent Lavanant
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Department of Chemistry, The University of Chicago, 5735 S. Ellis Avenue, Chicago, Illinois 60637
| | - Anca Silvestru
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Department of Chemistry, The University of Chicago, 5735 S. Ellis Avenue, Chicago, Illinois 60637
| | - Anne Faucheux
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Department of Chemistry, The University of Chicago, 5735 S. Ellis Avenue, Chicago, Illinois 60637
| | - Loic Toupet
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Department of Chemistry, The University of Chicago, 5735 S. Ellis Avenue, Chicago, Illinois 60637
| | - Richard F. Jordan
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Department of Chemistry, The University of Chicago, 5735 S. Ellis Avenue, Chicago, Illinois 60637
| | - Jean-François Carpentier
- Organométalliques et Catalyse, UMR 6509 CNRS-Université de Rennes 1, Institut de Chimie de Rennes, 35042 Rennes Cedex, France, Groupe Matière Condensée et Matériaux, Cristallochimie, UMR 6626 CNRS-Université de Rennes 1, 35042 Rennes Cedex, France, and Department of Chemistry, The University of Chicago, 5735 S. Ellis Avenue, Chicago, Illinois 60637
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23
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Morgan AR, Kloskowski M, Kalischewski F, Phillips AH, Petersen JL. Exploring Alternative Synthetic Routes for the Preparation of Five-Coordinate Diamidoamine Group 4 Metal Complexes. Organometallics 2005. [DOI: 10.1021/om0580349] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alicia R. Morgan
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Michael Kloskowski
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Felix Kalischewski
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Aaron H. Phillips
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
| | - Jeffrey L. Petersen
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045
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Zhu H, Wang M, Ma C, Li B, Chen C, Sun L. Preparation and structures of 6- and 7-coordinate salen-type zirconium complexes and their catalytic properties for oligomerization of ethylene. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.05.027] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Sanz M, Cuenca T, Galakhov M, Grassi A, Bott RKJ, Hughes DL, Lancaster SJ, Bochmann M. Monocyclopentadienyl Bis(phenoxo-imino) Zirconium Complexes as Precatalyst Species for Olefin Polymerization. Stereospecific Methylation of an Imino Group with Formation of a Zirconium−amido Bond. Organometallics 2004. [DOI: 10.1021/om049596f] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Mikhail Galakhov
- NMR Spectroscopy Center, Universidad de Alcalá, Campus Universitario, 28871-Alcalá de Henares, Spain
| | - Alfonso Grassi
- Dipartamento di Chimica, Università di Salerno, via S. Allende, 84081 Baronissi, Italy
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Oshiki T, Nomoto H, Tanaka K, Takai K. Catalytic Performance of Tantalum–η2-Alkyne Complexes [TaCl3(R1C≡CR2)L2] for Alkyne Cyclotrimerization. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2004. [DOI: 10.1246/bcsj.77.1009] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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Deckers PJW, Hessen B. C−H Bond Activation Processes in Cationic and Neutral Titanium Benzyl Compounds with Cyclopentadienyl−Arene Ligands. Organometallics 2002. [DOI: 10.1021/om0206554] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Patrick J. W. Deckers
- Dutch Polymer Institute/Center for Catalytic Olefin Polymerization, Stratingh Institute for Chemistry and Chemical Engineering, University of Groningen, Nijenborgh 4, NL-9747AG, Groningen, The Netherlands
| | - Bart Hessen
- Dutch Polymer Institute/Center for Catalytic Olefin Polymerization, Stratingh Institute for Chemistry and Chemical Engineering, University of Groningen, Nijenborgh 4, NL-9747AG, Groningen, The Netherlands
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Tshuva EY, Groysman S, Goldberg I, Kol M, Goldschmidt Z. [ONXO]-Type Amine Bis(phenolate) Zirconium and Hafnium Complexes as Extremely Active 1-Hexene Polymerization Catalysts. Organometallics 2002. [DOI: 10.1021/om010493w] [Citation(s) in RCA: 192] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Edit Y. Tshuva
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Stanislav Groysman
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Israel Goldberg
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Moshe Kol
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
| | - Zeev Goldschmidt
- Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
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29
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Chan MCW, Tam KH, Pui YL, Zhu N. Surprising activity for Group 4 polyolefin catalysts [M{(OAr)2py}Cl2(thf)] (M = Zr, Ti) bearing tridentate pyridine-2,6-bis(aryloxide) ligands. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b206328j] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yélamos C, Gust KR, Baboul AG, Heeg MJ, Schlegel HB, Winter CH. Early transition metal complexes containing 1,2,4-triazolato and tetrazolato ligands: synthesis, structure, and molecular orbital studies. Inorg Chem 2001; 40:6451-62. [PMID: 11720501 DOI: 10.1021/ic0109389] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Several early transition metal complexes bearing 1,2,4-triazolato and tetrazolato ligands have been prepared by reaction of the pyrazolato complexes Ti(tBu(2)pz)(4-x)Cl(x) (tBu(2)pz = 3,5-di-tert-butylpyrazolato; x = 1, 2) and M(tBu(2)pz)(5-x)Cl(x) (M = Nb, Ta: x = 2, 3) with the sodium or potassium salts derived from 1,2,4-triazoles and tetrazoles. The X-ray structure analysis of Ti(tBu(2)pz)(2)(Me(2)C(2)N(3))(2) shows eta(2)-coordination of the 1,2,4-triazolato ligands, while in Ti(tBu(2)pz)(3)(C(2)H(2)N(3)) and Nb(tBu(2)pz)(3)(Me(2)C(2)N(3))(2) the analogous groups are joined in a eta(1)-fashion in the solid-state structure. Solution NMR studies at different temperatures suggest transition states involving eta(2)-1,2,4-triazolato ligands for the complexes containing eta(1)-1,2,4-triazolato ligands in the solid state. X-ray crystal structures of analogous tetrazolato complexes Ti(tBu(2)pz)(3)(PhCN(4)) and Nb(tBu(2)pz)(3)(PhCN(4))(2) show eta(1)-coordination of the 2-nitrogen atoms of the tetrazolato ligands. Molecular orbital calculations have been carried out on several model titanium complexes and provide detailed insight into the bonding between early transition metal centers and 1,2,4-triazolato and tetrazolato ligands. The eta(2)-coordination mode of 1,2,4-triazolato and tetrazolato ligands is predicted to be more stable than the eta(1)-coordination mode by 13.8-5.2 kcal/mol.
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Affiliation(s)
- C Yélamos
- Department of Chemistry, Wayne State University, Detroit, MI 48202, USA
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31
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Tshuva EY, Goldberg I, Kol M, Goldschmidt Z. Coordination chemistry of amine bis(phenolate) titanium complexes: tuning complex type and structure by ligand modification. Inorg Chem 2001; 40:4263-70. [PMID: 11487331 DOI: 10.1021/ic010210s] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The coordination chemistry of titanium(IV) complexes of amine bis(phenolate) ligands was investigated by synthesizing various types of complexes and analyzing them specroscopically and structurally. Steric effects of tridentate [ONO]- and tetradentate [ONNO]-type ligands were studied by reacting the ligand precursors with titanium tetra(isopropoxide). [ONNO]-type ligands featuring an amine donor located on a pendant arm led to octahedral bis(isopropoxide) complexes, regardless of the steric bulk around the metal. Several such complexes having varying steric crowding were thus synthesized. On the other hand, steric effects were found to play a major role in determining the complex constitution when [ONO]-type ligands, featuring no side donor, were involved. Relatively sterically undemanding ligands led to octahedral bis(homoleptic) complexes, whereas increased steric bulk resulted in the formation of pentacoordinate bis(isopropoxide) complexes. These pentacoordinate complexes readily lead to bis(heteroleptic) complexes by reaction with nonsterically demanding [ONO]- and [ONNO]-type ligand precursors. In the latter case the sidearm nitrogen remains uncoordinated to the metal. The bis(isopropoxide) complexes of the [ONNO]-type ligands may also lead to bis(heteroleptic) complexes, however, these reactions are much slower.
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Affiliation(s)
- E Y Tshuva
- Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900, Israel
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