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Saha S, Krause JA, Guan H. C(sp)-H, S-H, and Sn-H Bond Activation with a Cobalt(I) Pincer Complex. Inorg Chem 2024; 63:13689-13699. [PMID: 38976491 DOI: 10.1021/acs.inorgchem.4c01993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
This study focuses on the stoichiometric reactions of {2,6-(iPr2PO)2C6H3}Co(PMe3)2 with terminal alkynes, thiols, and tin hydrides as part of an effort to develop catalytic, two-electron processes with cobalt. This specific Co(I) pincer complex proves to be effective for cleaving the C(sp)-H, S-H, and Sn-H bonds to give oxidative addition products with the general formula {2,6-(iPr2PO)2C6H3}CoHX(PMe3) (X = alkynyl, thiolate, and stannyl groups) along with the free PMe3. These reactions typically reach completion when the substituents on acetylene, sulfur, and tin are electron-withdrawing groups (e.g., phenyl, pyridyl, and alkenyl groups). In contrast, alkyl-substituted acetylenes, 1-pentanethiol, and tributyltin hydride are partially converted due to the equilibria with the corresponding oxidative addition products. The Co(I) pincer complex is not a hydrothiolation catalyst but capable of catalyzing the hydrostannation of terminal alkynes with Ph3SnH to produce β-(Z)-alkenylstannanes selectively.
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Affiliation(s)
- Sayantani Saha
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Jeanette A Krause
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Hairong Guan
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
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Zhuang X, Chen JY, Yang Z, Jia M, Wu C, Liao RZ, Tung CH, Wang W. Sequential Transformation of Terminal Alkynes to 1,3-Dienes by a Cooperative Cobalt Pyridonate Catalyst. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00486] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Xuewen Zhuang
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, People’s Republic of China
| | - Jia-Yi Chen
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People’s Republic of China
| | - Zhuoyi Yang
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, People’s Republic of China
| | - Mengjing Jia
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, People’s Republic of China
| | - Chengjuan Wu
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, People’s Republic of China
| | - Rong-Zhen Liao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People’s Republic of China
| | - Chen-Ho Tung
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, People’s Republic of China
| | - Wenguang Wang
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan 250100, People’s Republic of China
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3
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Röß-Ohlenroth R, Bredenkötter B, Volkmer D. Organometallic MFU-4l(arge) Metal–Organic Frameworks. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00297] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Richard Röß-Ohlenroth
- Chair of Solid State and Materials Chemistry, Institute of Physics, University of Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
| | - Björn Bredenkötter
- Chair of Solid State and Materials Chemistry, Institute of Physics, University of Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
| | - Dirk Volkmer
- Chair of Solid State and Materials Chemistry, Institute of Physics, University of Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
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Reinig RR, Fought EL, Ellern A, Windus TL, Sadow AD. Cobalt(ii) acyl intermediates in carbon-carbon bond formation and oxygenation. Dalton Trans 2018; 47:12147-12161. [PMID: 30090898 DOI: 10.1039/c8dt02661k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The organocobalt scorpionate compounds ToMCoR (ToM = tris(4,4-dimethyl-2-oxazolinyl)phenylborate; R = Bn, 1; CH2SiMe3, 2; Ph, 3; Et, 4; nBu, 5; Me, 6) react in carbonylation, oxidation, and carboxylation reactions via pathways that are distinctly influenced by the nature of the organometallic moiety. The compounds are prepared by reaction of ToMCoCl with the corresponding organolithium or organopotassium reagents. Compounds 1-6 were characterized by 8-line hyperfine coupling to cobalt in EPR spectra and solution phase magnetic measurements (μeff = 4-5μB) as containing a high-spin cobalt(ii) center. The UV-Vis spectra revealed an intense diagnostic band at ca. 700 nm (ε > 1000 M-1 cm-1) associated with the tetrahedral organocobalt(ii) center that was assigned to a d ← d transition on the basis of configuration interaction (CI) calculations. Complexes 1-6 react rapidly with CO to form equilibrating mixtures of the low spin organocobalt carbonyl ToMCo(R)CO, acyl ToMCoC([double bond, length as m-dash]O)R, and acyl carbonyl ToMCo{C([double bond, length as m-dash]O)R}CO. The 1H and 11B NMR spectra contained only one set of signals for the CO-treated solutions, whereas the solution-phase IR spectra contained up to two νCO and three νC([double bond, length as m-dash]O)R signals with intensities varying depending on the R group (R = Bn, 7; CH2SiMe3, 8; Ph, 9; Et, 10; nBu, 11; Me, 12). Single crystal X-ray diffraction of ToMCo{C([double bond, length as m-dash]O)Et}CO (10) supports its assignment as a square pyramidal cobalt(ii) acyl carbonyl complex. Upon evaporation of volatiles, solutions of 8-12 revert to the CO-free organocobalt starting materials 2-6, whereas attempts to isolate benzyl-derived 7 provide an unusual α-alkoxyketone species, characterized by single crystal X-ray diffraction. Despite the differences observed in the carbonylation of 1-6 as a result of varying the R group, compounds 7-12 all react rapidly with O2 through an oxygenation pathway to afford the corresponding carboxylate compounds ToMCoO2CR (R = Bn, 13; CH2SiMe3, 14; Ph, 15; Et, 16; nBu, 17; Me, 18). In contrast, the insertion of CO2 into the Co-C bond in 1-6 requires several days to weeks.
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Affiliation(s)
- Regina R Reinig
- US Department of Energy Ames Laboratory and Department of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, IA 50011, USA.
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Reinig RR, Fought EL, Ellern A, Windus TL, Sadow AD. Rapid and ordered carbonylation and oxygenation of a cobalt(ii) methyl. Chem Commun (Camb) 2017; 53:11020-11023. [PMID: 28936508 DOI: 10.1039/c7cc06339c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The oxidative carbonylation of ToMCoMe (1; ToM = tris(4,4-dimethyl-2-oxazolinyl)phenylborate) involves its rapid, reversible reaction with CO to form ToMCo{C(O)Me}CO (2) followed by rapid reaction with O2 yielding ToMCoOAc (3), in contrast to the slow direct carboxylation of ToMCoMe by CO2.
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Affiliation(s)
- Regina R Reinig
- Department of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, IA 50011, USA.
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Hill MS, Johnson AL, Manning TD, Molloy KC, Wickham BJ. Single-source AACVD of composite cobalt-silicon oxide thin films. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.07.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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7
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Abubekerov M, Gianetti TL, Kunishita A, Arnold J. Synthesis and characterization of coordinatively unsaturated nickel(II) and manganese(II) alkyl complexes supported by the hydrotris(3-phenyl-5-methylpyrazolyl)borate (Tp(Ph,Me)) ligand. Dalton Trans 2013; 42:10525-32. [PMID: 23748480 DOI: 10.1039/c3dt51087e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The synthesis of several nickel(II) and manganese(II) alkyl complexes supported by hydrotris(3-phenyl-5-methylpyrazolyl)borate (Tp(Ph,Me)) ligand is reported. The metal halide complexes Tp(Ph,Me)MnCl(CH3CN) (1) and Tp(Ph,Me)NiCl (4) were used as precursors for synthesis of Tp(Ph,Me)MnCH2Si(Me)3 (2), Tp(Ph,Me)MnCH2Ph (3), Tp(Ph,Me)NiCH2Si(Me)3 (5) and Tp(Ph,Me)NiCH2Ph (6). The resulting Mn(II) and Ni(II) alkyl complexes, 2-3 and 5-6, were characterized by X-ray crystallography, NMR spectroscopy, and FT-IR spectroscopy. X-ray crystallographic analysis revealed distorted tetrahedral geometries for complexes 2-3 and 5 with a κ(3)-Tp(Ph,Me). Complex 6, on the other hand, was found to have a distorted square planar geometry with κ(2)-Tp(Ph,Me) and an η(3)-benzyl ligand. Transformations of 4 and Tp(Ph,Me)CoCl (10) via treatment with NaN3 to yield Tp(Ph,Me)NiN3 (11), Tp(Ph,Me)CoN3 (12), along with the synthesis of (Tp(Ph,Me))2Ni (8) and Tp(Ph,Me)NiCl(3-Ph-5MepzH) (9) are also reported.
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Affiliation(s)
- Mark Abubekerov
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
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8
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Zhang G, Vasudevan KV, Scott BL, Hanson SK. Understanding the Mechanisms of Cobalt-Catalyzed Hydrogenation and Dehydrogenation Reactions. J Am Chem Soc 2013; 135:8668-81. [DOI: 10.1021/ja402679a] [Citation(s) in RCA: 253] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Guoqi Zhang
- Chemistry and Materials
Physics Applications Divisions, Los Alamos National Laboratory, Los Alamos, New Mexico
87545, United States
| | - Kalyan V. Vasudevan
- Chemistry and Materials
Physics Applications Divisions, Los Alamos National Laboratory, Los Alamos, New Mexico
87545, United States
| | - Brian L. Scott
- Chemistry and Materials
Physics Applications Divisions, Los Alamos National Laboratory, Los Alamos, New Mexico
87545, United States
| | - Susan K. Hanson
- Chemistry and Materials
Physics Applications Divisions, Los Alamos National Laboratory, Los Alamos, New Mexico
87545, United States
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Uehara K, Taketsugu T, Yonehara K, Mizuno N. Effects of Isolobal Heteroatoms in Divanadium-Substituted γ-Keggin-type Polyoxometalates on (OV)2(μ-OH)2 Diamond and (OV)2(μ-O) Core Structures and the Transformation. Inorg Chem 2013; 52:1133-40. [DOI: 10.1021/ic302508c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Kazuhiro Uehara
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tatsuya Taketsugu
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazuhiro Yonehara
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Noritaka Mizuno
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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10
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Tang Y, Xiao T, Zhou L. Cobalt-catalyzed alkyne–dihalomethane–amine coupling: an efficient route for propargylamines. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.08.136] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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11
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Hoshino Y, Shibata Y, Tanaka K. Rhodium-Catalyzed Three-Component Cross-Addition of Silylacetylenes, Alkynyl Esters, and Electron-Deficient Alkenes or Isocyanates. Angew Chem Int Ed Engl 2012; 51:9407-11. [DOI: 10.1002/anie.201204646] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Indexed: 11/06/2022]
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12
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Hoshino Y, Shibata Y, Tanaka K. Rhodium-Catalyzed Three-Component Cross-Addition of Silylacetylenes, Alkynyl Esters, and Electron-Deficient Alkenes or Isocyanates. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204646] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Kunishita A, Gianetti TL, Arnold J. Structures, Physicochemical Properties, and Reactivities of Cobalt(II) Complexes Supported by a Homoscorpionate (Tris(pyrazolyl)borate) Ligand TpPh,Me. Organometallics 2011. [DOI: 10.1021/om200973x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Atsushi Kunishita
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United
States
| | - Thomas L. Gianetti
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United
States
| | - John Arnold
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United
States
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14
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Harding DJ, Harding P, Dokmaisrijan S, Adams H. Redox-active nickel and cobalt tris(pyrazolyl)borate dithiocarbamate complexes: air-stable Co(ii) dithiocarbamates. Dalton Trans 2011; 40:1313-21. [DOI: 10.1039/c0dt01010c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Affiliation(s)
- Di Zhu
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
| | - Peter H. M. Budzelaar
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
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16
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Moatazedi Z, Katz MJ, Leznoff DB. Synthesis and characterization of a series of halide-bridged, multinuclear iron(ii) and cobalt(ii) diamido complexes and a dinuclear, high-spin cobalt(ii) alkyl derivative. Dalton Trans 2010; 39:9889-96. [DOI: 10.1039/c0dt00524j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Crossley IR. The Organometallic Chemistry of Group 10 Poly(pyrazolyl)borate Complexes. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2010. [DOI: 10.1016/b978-0-12-374784-6.00002-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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18
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Dorcier A, Merle N, Taoufik M, Bayard F, Lucas C, de Mallmann A, Basset JM. Preparation of a Well-Defined Silica-Supported Nickel-Diimine Alkyl Complex − Application for the Gas-Phase Polymerization of Ethylene. Organometallics 2009. [DOI: 10.1021/om800582x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Dorcier
- Université de Lyon, Institut de Chimie de Lyon, Lyon, France, Université Lyon 1, CPE Lyon, CNRS, UMR 5265 C2P2, LCOMS, Bâtiment 308 F − CPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616, Villeurbanne, France
| | - N. Merle
- Université de Lyon, Institut de Chimie de Lyon, Lyon, France, Université Lyon 1, CPE Lyon, CNRS, UMR 5265 C2P2, LCOMS, Bâtiment 308 F − CPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616, Villeurbanne, France
| | - M. Taoufik
- Université de Lyon, Institut de Chimie de Lyon, Lyon, France, Université Lyon 1, CPE Lyon, CNRS, UMR 5265 C2P2, LCOMS, Bâtiment 308 F − CPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616, Villeurbanne, France
| | - F. Bayard
- Université de Lyon, Institut de Chimie de Lyon, Lyon, France, Université Lyon 1, CPE Lyon, CNRS, UMR 5265 C2P2, LCOMS, Bâtiment 308 F − CPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616, Villeurbanne, France
| | - C. Lucas
- Université de Lyon, Institut de Chimie de Lyon, Lyon, France, Université Lyon 1, CPE Lyon, CNRS, UMR 5265 C2P2, LCOMS, Bâtiment 308 F − CPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616, Villeurbanne, France
| | - A. de Mallmann
- Université de Lyon, Institut de Chimie de Lyon, Lyon, France, Université Lyon 1, CPE Lyon, CNRS, UMR 5265 C2P2, LCOMS, Bâtiment 308 F − CPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616, Villeurbanne, France
| | - J. M. Basset
- Université de Lyon, Institut de Chimie de Lyon, Lyon, France, Université Lyon 1, CPE Lyon, CNRS, UMR 5265 C2P2, LCOMS, Bâtiment 308 F − CPE Lyon, 43 Boulevard du 11 Novembre 1918, F-69616, Villeurbanne, France
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19
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Harding DJ, Harding P, Daengngern R, Yimklan S, Adams H. Synthesis and characterization of redox-active tris(pyrazolyl)borate cobalt complexes. Dalton Trans 2009:1314-20. [DOI: 10.1039/b815001j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Cirera J, Ruiz E, Alvarez S. Stereochemistry and Spin State in Four-Coordinate Transition Metal Compounds. Inorg Chem 2008; 47:2871-89. [DOI: 10.1021/ic702276k] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jordi Cirera
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
| | - Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
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21
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Crossley IR. The Organometallic Chemistry of Group 9 Poly(pyrazolyl)borate Complexes. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2008. [DOI: 10.1016/s0065-3055(07)56004-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Bott SG, Yang K, Richmond MG. PMe3-induced CO insertion and CO deinsertion in the zwitterionic hydrocarbyl complex Co2(CO)4[μ-PhCC(H)PPh2CC(PPh2)C(O)OC(O)]: Syntheses and X-ray structures of Co2(CO)3(PMe3)[μ-PhC(CO)C(H)PPh2CC(PPh2)C(O)OC(O)] and Co2(CO)3(PMe3)[μ-PhCC(H)PPh2CC(PPh2)C(O)OC(O)]. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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23
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Nehete UN, Roesky HW, Zhu H, Nembenna S, Schmidt HG, Noltemeyer M, Bogdanov D, Samwer K. Polyhedral Cobalt(II) and Iron(II) Siloxanes: Synthesis and X-ray Crystal Structure of [(RSi(OH)O2)Co(OPMe3)]4 and [(RSiO3)2(RSi(OH)O2)4(μ3-OH)2Fe8(THF)4] (R = (2,6-iPr2C6H3)N(SiMe3)). Inorg Chem 2005; 44:7243-8. [PMID: 16180889 DOI: 10.1021/ic050859n] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The cobalt(II) and iron(II) siloxane compounds were prepared by the reaction of lipophilic N-bonded silanetriol 1 with metal silylamides M[N(SiMe3)2]2 (M = Co (2), Fe (3)) in a 1:1 and 3:4 molar ratio, respectively. A plot of 1/chi versus temperature in the range of 2-300 K indicates the paramagnetic behavior of 2 and 3. The composition and molecular structures of 2 and 3 were fully determined by IR, elemental analysis, and X-ray crystal structural analyses. Compound 2 possesses a pseudo-4-fold (S4) symmetry, whereas 3 reveals an inversion center. Compound 2 represents a tetracobalt(II) drum while 3 exhibits an octairon(II) cage containing siloxane ligands.
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Affiliation(s)
- Umesh N Nehete
- Institut für Anorganische Chemie der Georg-August Universität, Göttingen, Germany
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24
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Uehara K, Hikichi S, Inagaki A, Akita M. Xenophilic Complexes Bearing a TpR Ligand, [TpRM?M?Ln] [TpR=TpiPr2, Tp# (TpMe2,4-Br); M=Ni, Co, Fe, Mn; M?Ln=Co(CO)4, Co(CO)3(PPh3), RuCp(CO)2]: The Two Metal Centers are Held Together not by Covalent Interaction but by Electrostatic Attraction. Chemistry 2005; 11:2788-809. [PMID: 15736146 DOI: 10.1002/chem.200401016] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A series of dinuclear complexes, [Tp(R)M--M'L(n)] [Tp(iPr(2) )M--Co(CO)(4) (1; M=Ni, Co, Fe, Mn); Tp(#)M--Co(CO)(4) (1'; M=Ni, Co); Tp(#)Ni--RuCp(CO)(2) (3')] (Tp(iPr(2) )=hydrotris(3,5-diisopropylpyrazolyl)borato; Tp(#) (Tp(Me(2),4-Br))=hydrotris(3,5-dimethyl-4-bromopyrazolyl)borato), has been prepared by treatment of the cationic complexes [Tp(iPr(2) )M(NCMe)(3)]PF(6) or the halo complexes [Tp(#)M--X] with the appropriate metalates. Spectroscopic and crystallographic characterization of 1-3' reveals that the tetrahedral, high-spin Tp(R)M fragment and the coordinatively saturated carbonyl-metal fragment (M'L(n)) are connected only by a metal-metal interaction and, thus, the dinuclear complexes belong to a unique class of xenophilic complexes. The metal-metal interaction in the xenophilic complexes is polarized, as revealed by their nu(CO) vibrations and structural features, which fall between those of reference complexes: covalently bonded species [R--M'L(n)] and ionic species [M'L(n)](-). Unrestricted DFT calculations for the model complexes [Tp(H(2) )Ni--Co(CO)(4)], [Tp(H(2) )Ni--Co(CO)(3)(PH(3))], and [Tp(H(2) )Ni--RuCp(CO)(2)] prove that the two metal centers are held together not by covalent interactions, but by electrostatic attractions. In other words, the obtained xenophilic complexes can be regarded as carbonylmetalates, in which the cationic counterpart interacts with the metal center rather than the oxygen atom of the carbonyl ligand. The xenophilic complexes show divergent reactivity dependent on the properties of donor molecules. Hard (N and O donors) and soft donors (P and C donors) attack the Tp(R)M part and the ML(n) moiety, respectively. The selectivity has been interpreted in terms of the hard-soft theory, and the reactions of the high-spin species 1-3' with singlet donor molecules should involve a spin-crossover process.
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Affiliation(s)
- Kazuhiro Uehara
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Jenkins DM, Peters JC. Spin-State Tuning at Pseudotetrahedral d7 Ions: Examining the Structural and Magnetic Phenomena of Four-Coordinate [BP3]CoII−X Systems. J Am Chem Soc 2005; 127:7148-65. [PMID: 15884957 DOI: 10.1021/ja045310m] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electronic structure, spin-state, and geometrical relationships for a series of pseudotetrahedral Co(II) aryloxide, siloxide, arylthiolate, and silylthiolate complexes supported by the tris(phosphino)borate [BP(3)] ligands [PhBP(3)] and [PhBP(i)()(Pr)(3)] ([PhB(CH(2)PPh(2))(3)](-) and [PhB(CH(2)P(i)()Pr(2))(3)](-), respectively) are described. Standard (1)H NMR, optical, electrochemical, and solution magnetic data, in addition to low-temperature EPR and variable temperature SQUID magnetization data, are presented for the new cobalt(II) complexes [PhBP(3)]CoOSiPh(3) (2), [PhBP(3)]CoO(4-(t)()Bu-Ph) (3), [PhBP(3)]CoO(C(6)F(5)) (4), [PhBP(3)]CoSPh (5), [PhBP(3)]CoS(2,6-Me(2)-Ph) (6), [PhBP(3)]CoS(2,4,6-(i)()Pr(3)-Ph) (7), [PhBP(3)]CoS(2,4,6-(t)()Bu(3)-Ph) (8), [PhBP(3)]CoSSiPh(3) (9), [PhBP(3)]CoOSi(4-NMe(2)-Ph)(3) (10), [PhBP(3)]CoOSi(4-CF(3)-Ph)(3) (11), [PhBP(3)]CoOCPh(3) (12), [PhBP(i)()(Pr)(3)]CoOSiPh(3) (14), and [PhBP(i)()(Pr)(3)]CoSSiPh(3) (15). The low-temperature solid-state crystal structures of 2, 3, 5-10, 12, and 15 are also described. These pseudotetrahedral cobalt(II) complexes are classified as featuring one of two limiting distortions, either umbrella or off-axis. Magnetic and spectroscopic data demonstrate that both S = (1)/(2) and S = (3)/(2) ground-state electronic configurations are accessible for the umbrella distorted structure type, depending on the nature of the X-type ligand, its denticity (eta(1) versus eta(3)), and the tripodal phosphine ligand employed. Off-axis distorted complexes populate an S = (1)/(2) ground-state exclusively. For those four-coordinate complexes that populate S = (1)/(2) ground states, X-ray data show two Co-P bond distances that are invariably shorter than a third Co-P bond. The pseudotetrahedral siloxides 2, 10, and 11 are exceptional in that they display gradual spin crossover in the solid state. The diamagnetic cobalt(III) complex {[PhBP(3)]CoOSiPh(3)}{BAr(4)} ({16}{BAr(4)}) (Ar = Ph or 3,5-(CF(3))(2)-C(6)H(3)) has also been prepared and structurally characterized. Accompanying electronic structure calculations (DFT) for complexes 2, 6, and {16}(+) support the notion of a close electronic structure relationship between these four-coordinate systems and octahedral, sandwich, and half-sandwich coordination complexes.
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Affiliation(s)
- David M Jenkins
- Division of Chemistry and Chemical Engineering, Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, CA 91125. USA
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Synthesis and crystal structures of some cobalt halide derivatives containing alkyl or silanolato groups. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2004.10.043] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Coordinatively unsaturated organometallic system based on Tp ligand: tetrahedral TpRM-R′ and TpRM-M′Ln species. J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2004.08.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Jenkins DM, Peters JC. Solution and Solid-State Spin-Crossover Behavior in a Pseudotetrahedral d7 Ion. J Am Chem Soc 2003; 125:11162-3. [PMID: 16220914 DOI: 10.1021/ja036198f] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This Communication describes a pseudotetrahedral d7 complex, [PhBP3]Co(OSiPh3), that exhibits thermally induced spin-crossover both in solution and in the solid state. Magnetic crossover behavior is achieved by confluence of the X-type ligand and the tripodal auxiliary employed. Four-coordinate platforms of the present geometry type may offer a new approach to magnetic spin-crossover behavior distinct from their electronically related pseudooctahedral counterparts.
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Affiliation(s)
- David M Jenkins
- Division of Chemistry and Chemical Engineering, Arnold and Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, USA
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Kujime M, Hikichi S, Akita M. Synthesis and characterization of enolato-cobalt and -nickel complexes bearing TpiPr2 ligand, [TpiPr2M(XCHY)]n [TpiPr2=hydrotris(3,5-diisopropylpyrazolyl)borato; n=1, 2], obtained from hydroxometal complexes, (μ-OH)2(MTpiPr2)2, and active methylene compounds, CH2XY. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(02)01547-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Uehara K, Hikichi S, Akita M. Reactivity Control of a Dinuclear Xenophilic Species, Tp#Ni–RuCp(CO)2, via Spin Crossover across a Metal-metal Bond [Tp#: Hydrotris(4-bromo-3,5-dimethylpyrazolyl)borato]. CHEM LETT 2002. [DOI: 10.1246/cl.2002.1198] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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