1
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Hu L, Chakraborty S, Tumanov N, Wouters J, Robiette R, Berionni G. Regulating iminophosphorane PN bond reactivity through geometric constraints with cage-shaped triarylphosphines. Chem Commun (Camb) 2024; 60:7073-7076. [PMID: 38888188 DOI: 10.1039/d4cc01868k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
Structure-reactivity investigations and quantum-chemical parametrization of steric and electronic properties of geometrically constrained iminophosphoranes enabled the design of new frustrated Lewis pairs and revealed unusual properties at the phosphonium center embedded in the cage-shaped triptycene tricyclic scaffold.
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Affiliation(s)
- Lei Hu
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
- Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Place Louis Pasteur 1 box L4.01.02, Louvain-la-Neuve 1348, Belgium.
| | - Sayandip Chakraborty
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
| | - Nikolay Tumanov
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
| | - Johan Wouters
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
| | - Raphaël Robiette
- Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Place Louis Pasteur 1 box L4.01.02, Louvain-la-Neuve 1348, Belgium.
| | - Guillaume Berionni
- Université de Namur, Department of Chemistry, Namur Institute of Structured Matter (NISM), Rue de Bruxelles 61, Namur 5000, Belgium.
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2
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Xu X, Gao D, Wang J, Tang XY, Wang L. The B(C 6F 5) 3·H 2O promoted synthesis of fluoroalkylated 3,3',3''-trisindolylmethanes from fluorocarboxylic acids and indoles. Org Biomol Chem 2023; 21:1478-1486. [PMID: 36655817 DOI: 10.1039/d2ob02241a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Trisindolylmethanes (TIMs) exist in many bioactive natural products and are frequently applied in medicinal chemistry and materials science. Herein, a simple and efficient protocol promoted by B(C6F5)3·H2O for the synthesis of their fluoroalkylated analogues, fluoroalkylated 3,3',3''-TIMs, is reported for the first time. Easily accessible fluorocarboxylic acids are utilized as the fluoroalkyl sources, exhibiting an obvious fluorine effect. This convenient and green process features mild and metal-free conditions, easy scale-up, and an environmentally friendly byproduct.
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Affiliation(s)
- Xin Xu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Bio-inorganic Chemistry & Materia Medica; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Dandan Gao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Bio-inorganic Chemistry & Materia Medica; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Jiahua Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Bio-inorganic Chemistry & Materia Medica; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Xiang-Ying Tang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Bio-inorganic Chemistry & Materia Medica; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Long Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Bio-inorganic Chemistry & Materia Medica; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
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3
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Bidentate and Tridentate Coordination Modes of Bis(3-methylindolyl)-2-(1-methylimidazolyl)methane in Complexes of Aluminum and Gallium. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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4
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Rondo RT, Kirschbaum K, Mason MR. New class of trianionic constrained geometry ligands: Representative complexes of zirconium. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Tretiakov S, Damen JAM, Lutz M, Moret ME. A dianionic C 3-symmetric scorpionate: synthesis and coordination chemistry. Dalton Trans 2020; 49:13549-13556. [PMID: 32941574 DOI: 10.1039/d0dt02601h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Introducing charges into ligand systems fine-tunes their electronic properties and influences the solubility of their metal complexes. Herein, we present a synthesis of a dianionic, C3-symmetric ligand combining three anionic N-donors tethered to a positively charged phosphonium center. The tris-skatylmethylphosphonium (TSMP) ligand, isolated in the form of its dipotassium salt TSMPK2, is the first dianionic homoscorpionate capable of metal exchange. The potassium cations in TSMPK2 are exchangeable for other metals, which results in rich coordination chemistry. Thus, the ligand displays a bridging μ2:κ2:κ1 coordination mode with trigonal planar Cu(i) centers in the tetrameric complex [(TSMP)Cu]44-. The κ3 mode is accessed upon addition of 1 equiv. of P(OEt)3 per Cu(i) to yield the tetrahedral monomeric complex [(TSMP)CuP(OEt)3]-. Both Fe(ii) and Ni(ii) in pyridine give octahedral high-spin κ3 complexes with composition (TSMP)M(Py)3 (M = Fe, Ni). Displacement of three pyridine ligands in (TSMP)Fe(Py)3 for a second equivalent of TSMP gives a high-spin pseudotetrahedral 2 : 1 complex [(TSMP)2Fe]2- with the ligands in κ2 coordination mode. The reduction in coordination number is likely due to electrostatic repulsion of the negatively-charged indolides as well as their weaker π-accepting character as compared to pyridine.
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Affiliation(s)
- Serhii Tretiakov
- Utrecht University, Organic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science, 3584 CG Utrecht, The Netherlands.
| | - Johannes A M Damen
- Utrecht University, Organic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science, 3584 CG Utrecht, The Netherlands.
| | - Martin Lutz
- Utrecht University, Crystal and Structural Chemistry, Bijvoet Centre for Biomolecular Research, Faculty of Science, 3584 CH Utrecht, The Netherlands
| | - Marc-Etienne Moret
- Utrecht University, Organic Chemistry & Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science, 3584 CG Utrecht, The Netherlands.
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6
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Mecke E, Frank W. Crystal structure of 1,3-di- tert-butyl-2-chloro-1,3,2-di-aza-phospho-rinane - a saturated six-membered phospho-rus nitro-gen heterocycle with a partially flattened chair conformation and a long P III-Cl bond. Acta Crystallogr E Crystallogr Commun 2019; 75:552-556. [PMID: 31110784 PMCID: PMC6505585 DOI: 10.1107/s2056989019004195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 03/28/2019] [Indexed: 11/10/2022]
Abstract
Colourless blocks of 1,3-di-tert-butyl-2-chloro-1,3,2-di-aza-phospho-rinane, C11H24ClN2P (1), were obtained by sublimation in vacuo slightly above room temperature. The asymmetric unit of the monoclinic crystal structure of the six-membered N-heterocyclic compound is defined by one mol-ecule in a general position. The six-membered ring of the mol-ecule adopts a cyclo-hexane-like chair conformation; the chair at one side is to some extent flattened as a result of the approximately trigonal-planar coordination of both nitro-gen atoms. In detail, this modified chair conformation is characterized by an angle of 53.07 (15)° between the plane defined by the three carbon atoms and the best plane of the two nitro-gen atoms and the two carbon atoms bound to them, and an angle of 27.96 (7)° between the latter plane and the plane defined by the nitro-gen and phospho-rus atoms. The tert-butyl groups are oriented equatorially and the chloro substituent is oriented axially. The P-Cl bond length of 2.2869 (6) Å is substanti-ally longer than the P-Cl single-bond length in PCl3 [2.034 Å; Galy & Enjalbert (1982 ▸). J. Solid State Chem. 44, 1-23]. Inspection of the inter-molecular distances gives no evidence for inter-actions stronger than van der Waals forces. The closest contact is between the Cl atom and a methyl-ene group of a neighbouring mol-ecule with a Cl⋯C distance of 3.7134 (18) Å, excluding a significant influence on the P-Cl bonding.
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Affiliation(s)
- Erik Mecke
- Institut für Anorganische Chemie und Strukturchemie, Lehrstuhl II: Material- und Strukturforschung, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
| | - Walter Frank
- Institut für Anorganische Chemie und Strukturchemie, Lehrstuhl II: Material- und Strukturforschung, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
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7
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Witteman L, van Beek CB, van Veenhuizen ON, Lutz M, Moret ME. Synthesis and Complexation of a Free Germanide Bearing a Tridentate N-Heterocyclic Substituent. Organometallics 2019; 38:231-239. [PMID: 30713362 PMCID: PMC6354728 DOI: 10.1021/acs.organomet.8b00630] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Indexed: 11/28/2022]
Abstract
The tris-N-heterocycle germanide (tmim)Ge- (1) (tmimH3 = tris(3-methylindol-2-yl)methane) was synthesized by nucleophilic substitution for the tmim3- trianion on GeCl2·dioxane. In combination with the previously reported (tmim)Si- and (tmim)P analogues, it provides a convenient model for investigating the influence of the central atom on the properties of isoelectronic ligands. Complexation of the germanide (tmim)Ge- to CuCl resulted in the dimeric chloro cuprate [(tmim)GeCu(μ-Cl)]2 2-, which is prone to dissociation in MeCN to form the neutral, solvated germylcopper (tmim)GeCu(NCMe)3. The reaction of 1 with Fe2(CO)9 afforded the germyl iron tetracarbonyl [(tmim)GeFe(CO)4]-. Analysis of the ν̃(CO) infrared absorption bands in this complex indicates that the combined electron donating and accepting properties of 1 are found in between those of (tmim)P and (tmim)Si-. In contrast to (tmim)Si-, (tmim)Ge- is reluctant to coordinate to FeCl2, likely because of its softer Lewis base character. Key structural features of the ligands and complexes reflect changes in their electronic properties. In particular, the N-Ge-N angles increase upon coordination to a metal fragment, suggesting increasing hybridization of the Ge s- and p-orbitals. These findings will be useful in further understanding low-valent heavier group 14 complexes in organometallic chemistry.
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Affiliation(s)
- Léon Witteman
- Department of Chemistry, Debye Institute for Nanomaterials Science Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Cody B van Beek
- Department of Chemistry, Debye Institute for Nanomaterials Science Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Oscar N van Veenhuizen
- Department of Chemistry, Debye Institute for Nanomaterials Science Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Martin Lutz
- Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Marc-Etienne Moret
- Department of Chemistry, Debye Institute for Nanomaterials Science Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
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8
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Bidentate and tridentate coordination modes of bis(3-methylindolyl)-2-pyridylmethane in complexes of aluminum and gallium: Structural characterization of bridging N-indolide in a dialuminum complex. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.07.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Hastings SD, Cagle EC, Totsch TR, Tyus SD, Gray GM. Comparative Study of Novel Phosphordiamidite and Phosphite Ligands Used in Alkene Hydroformylation; Synthesis, Characterization, Metalation, and Catalytic Evaluation. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800724] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Samantha D. Hastings
- Department of Chemistry University of Alabama at Birmingham 901 14th Street South 1240 Birmingham Alabama 35294‐ USA
| | - Ethan C. Cagle
- Department of Chemistry University of Alabama at Birmingham 901 14th Street South 1240 Birmingham Alabama 35294‐ USA
| | - Timothy R. Totsch
- Department of Chemistry University of Alabama at Birmingham 901 14th Street South 1240 Birmingham Alabama 35294‐ USA
| | - Shakyra D. Tyus
- Department of Chemistry University of Alabama at Birmingham 901 14th Street South 1240 Birmingham Alabama 35294‐ USA
| | - Gary M. Gray
- Department of Chemistry University of Alabama at Birmingham 901 14th Street South 1240 Birmingham Alabama 35294‐ USA
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10
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Pizzano A. Features and Application in Asymmetric Catalysis of Chiral Phosphine-Phosphite Ligands. CHEM REC 2016; 16:2595-2618. [PMID: 27506574 DOI: 10.1002/tcr.201600076] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Indexed: 11/08/2022]
Abstract
Chiral phosphine-phosphites are a class of ligands for asymmetric catalysis characterized by two coordinating functionalities with different electronic properties. These ligands also possess a highly modular structure and, due to versatile synthetic processes, they can be tuned precisely in the catalyst optimization process. Research regarding the application of these ligands in several enantioselective catalytic processes has provided outstanding results in a good number of them. These processes include not only Rh catalyzed reactions, such as olefin hydrogenation and hydroformylation, but also other reactions, such as hydrogenation of olefins and imines by Ru complexes, of imines and N-heterocycles by Ir derivatives, allyl alkylation or conjugate addition by Cu catalysts, or hydrocyanation of olefins by Ni ones. Overall, the use of these ligands has led to the preparation of a wide variety of chiral building blocks with high enantiomeric excess. Therefore, phosphine-phosphites have become in an important class of ligands in asymmetric catalysis.
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Affiliation(s)
- Antonio Pizzano
- Instituto de Investigaciones Químicas (IIQ), and Centro de Innovación en Química Avanzada (ORFEO-CINQA), CSIC and Universidad de Sevilla, Américo Vespucio 49, 41092, Seville, Spain
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11
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Stark MJ, Shaw MJ, Rath NP, Bauer EB. Synthesis, Structural Characterization, and Catalytic Activity of Indenyl Tris(
N
‐pyrrolyl)phosphine Complexes of Ruthenium. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501381] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Matthew J. Stark
- Department of Chemistry and Biochemistry, University of Missouri – St. Louis, One University Boulevard, St. Louis, MO 63121, USA, http://www.eike‐bauer.net
| | - Michael J. Shaw
- Department of Chemistry, Southern Illinois University Edwardsville, Edwardsville, IL 62025, USA
| | - Nigam P. Rath
- Department of Chemistry and Biochemistry, University of Missouri – St. Louis, One University Boulevard, St. Louis, MO 63121, USA, http://www.eike‐bauer.net
- Center for Nanoscience, University of Missouri, St. Louis, MO, USA
| | - Eike B. Bauer
- Department of Chemistry and Biochemistry, University of Missouri – St. Louis, One University Boulevard, St. Louis, MO 63121, USA, http://www.eike‐bauer.net
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12
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Tazelaar CGJ, Nicolas E, van Dijk T, Broere DLJ, Cardol M, Lutz M, Gudat D, Slootweg JC, Lammertsma K. Tris(pyrazolyl)phosphines with copper(i): from monomers to polymers. Dalton Trans 2016; 45:2237-49. [DOI: 10.1039/c5dt03994k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Peral D, Herrera D, Real J, Flor T, Bayón JC. Strong π-acceptor sulfonated phosphines in biphasic rhodium-catalyzed hydroformylation of polar alkenes. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01004g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Trifluoromethylated and sulfonated triarylphosphines are remarkably resistant toward oxidation and very active for the biphasic hydroformylation of polar alkenes.
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Affiliation(s)
- Daniel Peral
- Departament de Química
- Universitat Autònoma de Barcelona
- Barcelona 08193
- Spain
| | - Daniel Herrera
- Departament de Química
- Universitat Autònoma de Barcelona
- Barcelona 08193
- Spain
| | - Julio Real
- Departament de Química
- Universitat Autònoma de Barcelona
- Barcelona 08193
- Spain
| | - Teresa Flor
- Departament de Química
- Universitat Autònoma de Barcelona
- Barcelona 08193
- Spain
| | - J. Carles Bayón
- Departament de Química
- Universitat Autònoma de Barcelona
- Barcelona 08193
- Spain
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14
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Chen SJ, Li YQ, Wang P, Lu Y, Zhao XL, Liu Y. Promotion effect of water on hydroformylation of styrene and its derivatives with presence of amphiphilic zwitterionic phosphines. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.07.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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15
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Cristóbal-Lecina E, Etayo P, Doran S, Revés M, Martín-Gago P, Grabulosa A, Costantino AR, Vidal-Ferran A, Riera A, Verdaguer X. MaxPHOS Ligand: PH/NH Tautomerism and Rhodium- Catalyzed Asymmetric Hydrogenations. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300662] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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16
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17
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Bravo MJ, Ceder RM, Muller G, Rocamora M. New Enantiopure P,P-Bidentate Bis(diamidophosphite) Ligands. Application in Asymmetric Rhodium-Catalyzed Hydrogenation. Organometallics 2013. [DOI: 10.1021/om400119q] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maritza J. Bravo
- Departament de Quı́mica
Inorgànica, Universitat de Barcelona, Martı́ i Franquès 1-11, 08028-Barcelona, Spain
| | - Rosa M. Ceder
- Departament de Quı́mica
Inorgànica, Universitat de Barcelona, Martı́ i Franquès 1-11, 08028-Barcelona, Spain
| | - Guillermo Muller
- Departament de Quı́mica
Inorgànica, Universitat de Barcelona, Martı́ i Franquès 1-11, 08028-Barcelona, Spain
| | - Mercè Rocamora
- Departament de Quı́mica
Inorgànica, Universitat de Barcelona, Martı́ i Franquès 1-11, 08028-Barcelona, Spain
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18
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Aznar R, Grabulosa A, Mannu A, Muller G, Sainz D, Moreno V, Font-Bardia M, Calvet T, Lorenzo J. [RuCl2(η6-p-cymene)(P*)] and [RuCl2(κ-P*-η6-arene)] Complexes Containing P-Stereogenic Phosphines. Activity in Transfer Hydrogenation and Interactions with DNA. Organometallics 2013. [DOI: 10.1021/om3012294] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rosario Aznar
- Departament de Quı́mica Inorgànica, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
| | - Arnald Grabulosa
- Departament de Quı́mica Inorgànica, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
| | - Alberto Mannu
- Departament de Quı́mica Inorgànica, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
- Istituto
di Chimica Biomolecolare, CNR, trav. La Crucca 3, 07100, Sassari, Italy
| | - Guillermo Muller
- Departament de Quı́mica Inorgànica, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
| | - Daniel Sainz
- Departament de Quı́mica Inorgànica, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
| | - Virtudes Moreno
- Departament de Quı́mica Inorgànica, Universitat de Barcelona, Martí
i Franquès 1-11, E-08028 Barcelona, Spain
| | - Mercè Font-Bardia
- Departament de Crystal·lografia,
Mineralogia i Dipòsits
Minerals, Universitat de Barcelona, Martı́ i Franquès s/n, E-08028 Barcelona, Spain
| | - Teresa Calvet
- Departament de Crystal·lografia,
Mineralogia i Dipòsits
Minerals, Universitat de Barcelona, Martı́ i Franquès s/n, E-08028 Barcelona, Spain
| | - Julia Lorenzo
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Bellaterra,
Barcelona, Spain
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19
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Fourmy K, Mallet-Ladeira S, Dechy-Cabaret O, Gouygou M. Gold Phosphole Complexes as Efficient Catalysts for Alkyne Activation. Organometallics 2013. [DOI: 10.1021/om301244m] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kévin Fourmy
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne,
BP 44099, F-31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Sonia Mallet-Ladeira
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne,
BP 44099, F-31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Odile Dechy-Cabaret
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne,
BP 44099, F-31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4, France
| | - Maryse Gouygou
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne,
BP 44099, F-31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4, France
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20
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Freeman JL, Zhao Q, Zhang Y, Wang J, Lawson CM, Gray GM. Synthesis, linear and nonlinear optical properties of phosphonato-substituted bithiophenes derived from 2,2′-biphenol. Dalton Trans 2013; 42:14281-97. [DOI: 10.1039/c3dt51499d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Song B, Kirschbaum K, Mason MR. Planar, Three-Coordinate Boron Monohydrides Ligated by Bis(3-methylindolyl)methanes. Organometallics 2011. [DOI: 10.1021/om2006694] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bingxu Song
- Department of Chemistry, School
for Green Chemistry and Engineering, University of Toledo, Toledo, Ohio 43606-3390s
| | - Kristin Kirschbaum
- Department of Chemistry, School
for Green Chemistry and Engineering, University of Toledo, Toledo, Ohio 43606-3390s
| | - Mark R. Mason
- Department of Chemistry, School
for Green Chemistry and Engineering, University of Toledo, Toledo, Ohio 43606-3390s
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22
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Grabulosa A, Mannu A, Muller G, Calvet T, Font-Bardia M. P-Stereogenic monophosphines in Pd-catalysed enantioselective hydrovinylation of styrene. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.02.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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Dmitrichenko M, Ivanov A, Bidusenko I, Ushakov I, Mikhaleva A, Trofimov B. Reaction of 1-vinylpyrrole-2-carbaldehydes with phosphorus pentachloride: a stereoselective synthesis of E-2-(2-dichloromethylpyrrol-1-yl)vinylphosphonyl dichlorides. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.01.072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Kingsley NB, Kirschbaum K, Mason MR. Confirmation of Bridging N-Indolides in 3-Methylindole and Di- and Tri(3-methylindolyl)methane Complexes of Dimethyl-, Diethyl-, and Diisobutylaluminum. Organometallics 2010. [DOI: 10.1021/om100781k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicholas B. Kingsley
- Department of Chemistry, MS 602, The University of Toledo, Toledo, Ohio 43606-3390, United States
| | - Kristin Kirschbaum
- Department of Chemistry, MS 602, The University of Toledo, Toledo, Ohio 43606-3390, United States
| | - Mark R. Mason
- Department of Chemistry, MS 602, The University of Toledo, Toledo, Ohio 43606-3390, United States
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25
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Wang H, Shen H, Chan HS, Xie Z. Synthesis and Structural Characterization of Group 4 Metal Complexes Bearing Pentavalent Phosphorus-Bridged Ligands [(C13H8)(iPr2N)P(−O)(C2B10H10)]2− and [(C13H9)(iPr2N)P(═O)(C2B9H10)]2−. Organometallics 2008. [DOI: 10.1021/om800319w] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Hong Wang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, Peopleʼs Republic of China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, Peopleʼs Republic of China
| | - Hao Shen
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, Peopleʼs Republic of China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, Peopleʼs Republic of China
| | - Hoi-Shan Chan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, Peopleʼs Republic of China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, Peopleʼs Republic of China
| | - Zuowei Xie
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, Peopleʼs Republic of China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, Peopleʼs Republic of China
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26
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Betley TA, Surendranath Y, Childress MV, Alliger GE, Fu R, Cummins CC, Nocera DG. A ligand field chemistry of oxygen generation by the oxygen-evolving complex and synthetic active sites. Philos Trans R Soc Lond B Biol Sci 2008; 363:1293-303; discussion 1303. [PMID: 17971328 PMCID: PMC2614088 DOI: 10.1098/rstb.2007.2226] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Oxygen-oxygen bond formation and O2 generation occur from the S4 state of the oxygen-evolving complex (OEC). Several mechanistic possibilities have been proposed for water oxidation, depending on the formal oxidation state of the Mn atoms. All fall under two general classifications: the AB mechanism in which nucleophilic oxygen (base, B) attacks electrophilic oxygen (acid, A) of the Mn4Ca cluster or the RC mechanism in which radical-like oxygen species couple within OEC. The critical intermediate in either mechanism involves a metal oxo, though the nature of this oxo for AB and RC mechanisms is disparate. In the case of the AB mechanism, assembly of an even-electron count, high-valent metal-oxo proximate to a hydroxide is needed whereas, in an RC mechanism, two odd-electron count, high-valent metal oxos are required. Thus the two mechanisms give rise to very different design criteria for functional models of the OEC active site. This discussion presents the electron counts and ligand geometries that support metal oxos for AB and RC O-O bond-forming reactions. The construction of architectures that bring two oxygen functionalities together under the purview of the AB and RC scenarios are described.
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Affiliation(s)
| | | | | | | | | | | | - Daniel G Nocera
- Department of Chemistry, Massachusetts Institute of Technology77 Massachusetts Avenue, 6-335, Cambridge, MA 02139-4307, USA
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27
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Dixon IM, Lebon E, Loustau G, Sutra P, Vendier L, Igau A, Juris A. Broad HOMO–LUMO gap tuning through the coordination of a single phosphine, aminophosphine or phosphite onto a Ru(tpy)(bpy)2+ core. Dalton Trans 2008:5627-35. [DOI: 10.1039/b806325g] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Thirupathi N, Stricklen PM, Liu X, Oshel R, Guzei I, Ellern A, Verkade JG. Comparisons of phosphorus ligation properties in P(CH2NR)3P. Inorg Chem 2007; 46:9351-63. [PMID: 17892282 DOI: 10.1021/ic0703070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bicyclic P(CH2NMe)3P was synthesized, and its reactions with MnO2, elemental sulfur, p-toluenesulfonyl azide, BH3.THF, and W(CO)5(THF) were shown to furnish a variety of products in which the PC3 and/or the PN3 phosphorus are oxidized/coordinated. In contrast, reactions of the previously known P(CH2NPh)3P with Mo(0) and Ru(II) precursors were shown to afford products in which only the PC3 phosphorus is coordinated. The contrast in reactivity of P(CH2NR)3P (R = Me, Ph) with the aforementioned reagents is discussed in terms of steric and electronic factors. The new compounds are characterized by analytical and spectroscopic (IR, 1H, 31P, and 13C NMR) methods. The results of crystal and molecular structure X-ray analyses of the previously known compounds P(CH2O)3P and P(CH2NPh)3P and 6 of the 14 new compounds obtained in this investigation are presented. Salient features of these structures and the analysis of the Tolman cone angles calculated from their structural parameters are discussed in terms of the effects of constraint in the bicyclic moieties. Evidence is presented for greater M-P sigma bonding effects on coordination of the PC3 phosphorus of P(CH2NR)3P (R = Me, Ph) than are present in PMe3 analogues of group 6B metal carbonyls. From 1JBP data on the BH3 adducts of P(CH2NMe)3P, it is suggested that the free bases MeC(CH2NMe)3P < P(CH2NMe)3P < (Me2N)3P < P(MeNCH2CH2)3N increase in Lewis basicity at the PN3 phosphorus in the order shown. Substantial differences in 31P chemical shifts in the bicyclic compounds discussed herein relative to their acyclic analogues do not seem to be associated with the relatively small bond angle changes that occur around either the PN3 or the PC3 trivalent phosphorus atoms.
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Affiliation(s)
- Natesan Thirupathi
- Department of Chemistry, Iowa State University, Ames, IA 50011-3111, USA
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29
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Gavrilov KN, Tsarev VN, Konkin SI, Petrovskii PV, Lubuzh ED, Davankov VA. Chiral P,N-bidentate N-pyrrolylphophines as ligands with remarkable electronic properties. RUSS J COORD CHEM+ 2007. [DOI: 10.1134/s1070328407050132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Wang H, Chan HS, Xie Z. Pentavalent vs Trivalent Phosphorus-Bridged Ligands. Synthesis and Structural Characterization of Unexpected Group 4 Metal Complexes Incorporating an Indenylide Unit, [σ:σ-iPr2NP(O)(C9H6)(C2B10H10)]M(NR2)2. Organometallics 2006. [DOI: 10.1021/om060082l] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hong Wang
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, People's Republic of China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, People's Republic of China
| | - Hoi-Shan Chan
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, People's Republic of China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, People's Republic of China
| | - Zuowei Xie
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, People's Republic of China, and State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, People's Republic of China
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31
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Gavrilov KN, Tsarev VN, Konkin SI, Lyubimov SE, Korlyukov AA, Antipin MY, Davankov VA. Imino‐ and Oxazolino‐Functionalised Pyrrolylphosphanes and Pyrrolylphosphinites: An Unexploited Class of Chiral
P,N
‐Bidentate Ligands with Unusual Electronic Properties. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200500075] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Konstantin N. Gavrilov
- Department of Chemistry, Ryazan State Pedagogic University, 46 Svoboda str., Ryazan, 390000, Russia, Fax: +7‐0912‐775‐498
| | - Vasily N. Tsarev
- Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., Moscow, 119991, Russia, Fax: +7‐095‐135‐6471
| | - Stanislav I. Konkin
- Department of Chemistry, Ryazan State Pedagogic University, 46 Svoboda str., Ryazan, 390000, Russia, Fax: +7‐0912‐775‐498
| | - Sergey E. Lyubimov
- Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., Moscow, 119991, Russia, Fax: +7‐095‐135‐6471
| | - Alexander A. Korlyukov
- Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., Moscow, 119991, Russia, Fax: +7‐095‐135‐6471
| | - Mikhail Yu. Antipin
- Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., Moscow, 119991, Russia, Fax: +7‐095‐135‐6471
| | - Vadim A. Davankov
- Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova str., Moscow, 119991, Russia, Fax: +7‐095‐135‐6471
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33
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Fortuitous formation of [(LiCl)6{(Me2NCH2C8H5N)3P}2]: an amine-ligated hexameric lithium chloride aggregate. INORG CHEM COMMUN 2005. [DOI: 10.1016/j.inoche.2005.01.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Deprotonated diindolylmethanes as dianionic analogues of scorpionate bis(pyrazolyl)borate ligands: synthesis and structural characterization of representative titanocene and zirconocene complexes. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2004.09.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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35
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Beddie C, Hollink E, Wei P, Gauld J, Stephan DW. Use of Computational and Synthetic Chemistry in Catalyst Design: A New Family of High-Activity Ethylene Polymerization Catalysts Based on Titanium Tris(amino)phosphinimide Complexes. Organometallics 2004. [DOI: 10.1021/om049545i] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chad Beddie
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B3P4
| | - Emily Hollink
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B3P4
| | - Pingrong Wei
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B3P4
| | - James Gauld
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B3P4
| | - Douglas W. Stephan
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada, N9B3P4
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36
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Montilla F, Galindo A, Rosa V, Aviles T. Effect of trimethylsilyl substitution on the chemical properties of triarylphosphines and their corresponding metal-complexes: solubilising effect in supercritical carbon dioxide. Dalton Trans 2004:2588-92. [PMID: 15303177 DOI: 10.1039/b406691j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The donor strengths of the following triarylphosphine ligands P(Ar)(2)(Ar')(Ar = Ar'= 4-Me(3)SiC(6)H(4), 1b; 4-Me(3)CC(6)H(4), 1d; 4-F(3)CC(6)H(4), 1e; Ar = C(6)H(5), Ar'= 4-Me(3)SiC(6)H(4), 1c) have been evaluated experimentally and theoretically. The measurements of the J(P-Se) coupling constants of the corresponding synthesised selenides Se=P(Ar)(2)(Ar'), 2b,c and the DFT calculation of the energies of the phosphine lone-pair (HOMO) reveal insignificant influence on the electronic properties of the substituted phosphines when the trimethylsilyl group is attached to the aryl ring, in marked contrast to the strong electronic effect of the trifluoromethyl group. These triarylphosphine ligands P(Ar)(2)(Ar') reacted with (eta5-C(5)H(5))Co(CO)(2), (eta5-C(5)H(5))Co(CO)I(2) or PdCl(2) to yield the new compounds (eta5-C(5)H(5))Co(CO)[P(Ar)(2)(Ar')], 3b,d; (eta5-C(5)H(5))CoI(2)[P(Ar)(2)(Ar')], 4b-e; and PdCl(2)[P(Ar)(2)(Ar')](2), 5b,c respectively. These complexes have been characterized and their spectroscopic properties compared with those reported for the known triphenylphosphine complexes. Again, the contrast of the (31)P NMR and (13)C NMR chemical shifts or C-O or M-Cl stretching frequencies, when applied, does not show an important electronic effect on the metal complex of the trimethylsilyl substituted phosphines with respect to P(C(6)H(5))(3) derivatives. Solubility measurements of complexes 3a and 3b in scCO(2) were performed. We conclude that Me(3)Si groups on the triarylphosphine improve the solubility of the corresponding metal complex in scCO(2).
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Affiliation(s)
- Francisco Montilla
- Departamento de Quimica Inorganica, Facultad de Quimica, Universidad de Sevilla, Aptdo. 553, 41071 Seville, Spain.
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Mason MR, Fneich BN, Kirschbaum K. Titanium and Zirconium Amido Complexes Ligated by 2,2‘-Di(3-methylindolyl)methanes: Synthesis, Characterization, and Ethylene Polymerization Activity. Inorg Chem 2003; 42:6592-4. [PMID: 14552606 DOI: 10.1021/ic0347236] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
2,2'-Di(3-methylindolyl)methanes (L(2)H(2)) are introduced as dianionic, bidentate ligands of reduced pi-donating ability. Four complexes of the type L(2)Ti(NEt(2))(2) and L(2)Zr(NEt(2))(2)(THF) have been synthesized and characterized by elemental analysis, NMR ((1)H, (13)C) spectroscopy, and X-ray crystallography. Structural data confirm the reduced pi-donating ability of the eta(1)-indolyl moiety compared to that of diethylamido. Preliminary catalytic activities of these group 4 complexes for the polymerization of ethylene are reported.
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Affiliation(s)
- Mark R Mason
- Department of Chemistry, MS 602, University of Toledo, Toledo, Ohio 43606, USA.
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38
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Suárez A, Méndez-Rojas MA, Pizzano A. Electronic Differences between Coordinating Functionalities of Chiral Phosphine−Phosphites and Effects in Catalytic Enantioselective Hydrogenation. Organometallics 2002. [DOI: 10.1021/om020140c] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrés Suárez
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, c/Américo Vespucio s/n, Isla de la Cartuja, 41092 Sevilla, Spain, and Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, Pachuca 42073, Hidalgo, Mexico
| | - Miguel A. Méndez-Rojas
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, c/Américo Vespucio s/n, Isla de la Cartuja, 41092 Sevilla, Spain, and Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, Pachuca 42073, Hidalgo, Mexico
| | - Antonio Pizzano
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, c/Américo Vespucio s/n, Isla de la Cartuja, 41092 Sevilla, Spain, and Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, Pachuca 42073, Hidalgo, Mexico
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39
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Barnard TS, Mason MR. Hindered axial-equatorial carbonyl exchange in an Fe(CO)(4)(PR(3)) complex of a rigid bicyclic phosphine. Inorg Chem 2001; 40:5001-9. [PMID: 11531450 DOI: 10.1021/ic001372b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Variable-temperature (13)C NMR spectra for a series of Fe(CO)(4)(PR(3)) complexes ligated by phosphatri(3-methylindolyl)methane (1), phosphatri(pyrrolyl)methane (2), P(N-3-methylindolyl)(3) (3), and P(N-pyrrolyl)(3) (4) are reported. Ligand 2 was prepared by reaction of tri(pyrrolyl)methane with PCl(3) in THF and Et(3)N. Compound 2 is stable to methanolysis, hydrolysis, and aerial oxidation at room temperature. Reactions of 2 with selenium powder and Rh(acac)(CO)(2) yield phosphatri(pyrrolyl)methane selenide (5) and Rh(acac)(CO)(2) (6), respectively. The carbonyl stretching frequency in the IR spectrum of 6 and the magnitude of (1)J(Se)(-)(P) in the (31)P NMR spectrum of 5 indicate that 2 is a strong pi-acid and a weak sigma-base, commensurate with its lack of reactivity with CH(3)I. The trend in the decreasing basicity of 2 and related phosphines and phosphites was determined to be P(NMe(2))(3) > 3 > 4 > 1 > P(OPh)(3) > 2. IR data for a series of Rh(acac)(CO)(PR(3)) complexes indicate the trend in decreasing pi-acceptor ability to be 2 approximately 1 > 4 > P(OPh)(3) > 3 > PPh(3). Phosphines 1-4 were reacted with Fe(2)(CO)(9) to yield Fe(CO)(4)(1) (7), Fe(CO)(4)(2) (8), Fe(CO)(4)(3) (9), and Fe(CO)(4)(4) (10), respectively. IR data for 7-10 support the trend in pi-acidity listed above. Variable-temperature (13)C NMR spectra for compounds 8-10 show a single doublet resonance for the carbonyls in the temperature range from -80 to 20 degrees C indicative of rapid intramolecular rearrangement of carbonyls between axial and equatorial sites. However, the (13)C NMR spectrum for 7 shows slowed axial-equatorial carbonyl exchange at 20 degrees C. The limiting slow-exchange spectrum is observed at -20 degrees C. Hindered carbonyl exchange in 7 is attributed to the rigid 3-fold symmetry and steric bulk of 1. In addition to characterization of the new compounds by NMR ((1)H, (13)C, and (31)P) spectroscopy, IR spectroscopy, mass spectrometry, and elemental analysis, compounds 2, 7, 9, and 10 were further characterized by X-ray crystallography.
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Affiliation(s)
- T S Barnard
- Department of Chemistry, University of Toledo, Toledo, Ohio 43606-3390, USA
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