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Weller R, Balmer M, Hänisch CV, Gunnar Werncke C. Synthesis of the open-shell 3d-transition metal(II) bis(phosphinidenide) [Mn{P(sIDipp)} 2]. Dalton Trans 2022; 51:1765-1768. [PMID: 35013743 DOI: 10.1039/d1dt03805b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterization of the first homoleptic open-shell transition metal phosphinidenide is presented. By reacting [MnL2] (L = -N(SiMe3)2) with [(sIDipp)PK] (sIDipp = 1,3-bis(2,6-di-iso-propylphenyl)-imidazolidine-2-ylidene), the formation of [Mn{P(sIDipp)}2] instead of the initially expected adduct [KMn{P(sIDipp)}L2] is observed. Interestingly, a solvent change from toluene to n-pentane leads to the formation of [(sIDipp)PK2(Et2O)4][MnL3] after work-up, which can be seen as intermediate in the formation process of [Mn{P(sIDipp)}2]. Contrary to manganese, the highly reducing phosphinidenide [(sIDipp)P]- cannot be stabilized in an analogous fashion by coordination to a low-coordinate high-spin iron(II) center.
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Affiliation(s)
- Ruth Weller
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany.
| | - Markus Balmer
- Dockweiler Chemicals GmbH, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany
| | - Carsten von Hänisch
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany.
| | - C Gunnar Werncke
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, D-35032 Marburg, Germany.
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2
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Sharpe HR, Geer AM, Blundell TJ, Hastings FR, Fay MW, Rance GA, Lewis W, Blake AJ, Kays DL. Dehydrocoupling of dimethylamine–borane promoted by manganese(ii) m-terphenyl complexes. Catal Sci Technol 2018. [DOI: 10.1039/c7cy02086d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Low-coordinate m-terphenyl complexes are precatalysts for dehydrocoupling of dimethylamine–borane, where small changes in coordination environment effect significant mechanistic differences.
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Affiliation(s)
- Helen R. Sharpe
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham
- UK
| | - Ana M. Geer
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham
- UK
| | - Toby J. Blundell
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham
- UK
| | - Fiona R. Hastings
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham
- UK
| | - Michael W. Fay
- Nanoscale and Microscale Research Centre
- University of Nottingham
- University Park
- Nottingham
- UK
| | - Graham A. Rance
- Nanoscale and Microscale Research Centre
- University of Nottingham
- University Park
- Nottingham
- UK
| | - William Lewis
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham
- UK
| | | | - Deborah L. Kays
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham
- UK
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3
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Lorenz V, Ehle S, Liebing P, Engelhardt F, Hashemi-Haeri H, Oehler F, Hinderberger D, Busse S, Urbaschok J, Edelmann FT. High-yield synthesis of a unique Mn(iii) siloxide complex through KMnO 4 oxidation of a Mn(ii) precursor. Dalton Trans 2017; 47:62-66. [PMID: 29226937 DOI: 10.1039/c7dt03500d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A unique trivalent manganese siloxide complex, blue-violet MnIIILi2Cl[(Ph2SiO)2O]2(THF)4·2THF (3) has been prepared by a straightforward two-step synthetic protocol. Lithiation of (Ph2SiOH)2O (1) followed by reaction with MnCl2(THF)2 gave the structurally remarkable Mn(ii) precursor MnIILi4Cl2[(Ph2SiO)2O]2(THF)5·2THF (2). Surprisingly, the final oxidation step could be achieved using KMnO4 in THF to provide the Mn(iii) species 3 in high yield (91%). Both title compounds were structurally characterized by single-crystal X-ray diffraction.
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Affiliation(s)
- Volker Lorenz
- Chemisches Institut der Otto-von-Guericke-Universität, 39106 Magdeburg, Germany.
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4
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Inverse coordination – An emerging new chemical concept. II. Halogens as coordination centers. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.08.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sharpe HR, Geer AM, Williams HEL, Blundell TJ, Lewis W, Blake AJ, Kays DL. Cyclotrimerisation of isocyanates catalysed by low-coordinate Mn(ii) and Fe(ii) m-terphenyl complexes. Chem Commun (Camb) 2017; 53:937-940. [DOI: 10.1039/c6cc07243g] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Isocyanurates can be synthesised through the cyclotrimerisation of primary isocyanates catalysed by low-coordinate manganese(ii) and iron(ii) m-terphenyl complexes under mild conditions.
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Affiliation(s)
| | - Ana M. Geer
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
| | | | | | - William Lewis
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
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6
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Li Y, Zhou Q, Zou XZ, Gu JZ, Chen B, Kirillov AM. 4,4′-(Pyridine-2,5-diyl)dibenzoic acid as a building block for Cd(II) and Mn(II) coordination compounds: Synthesis, structural features and properties. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Sattler A, Parkin G. Synthesis, Structural Characterization, and Cyclometalation Chemistry of Tantalum Terphenyl Compounds. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aaron Sattler
- Department
of Chemistry, Columbia University, 3000 Broadway, MC 3115, New York, New York 10027, United States
| | - Gerard Parkin
- Department
of Chemistry, Columbia University, 3000 Broadway, MC 3115, New York, New York 10027, United States
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8
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Lin CY, Fettinger JC, Chilton NF, Formanuik A, Grandjean F, Long GJ, Power PP. Salts of the two-coordinate homoleptic manganese(i) dialkyl anion [Mn{C(SiMe3)3}2]− with quenched orbital magnetism. Chem Commun (Camb) 2015; 51:13275-8. [DOI: 10.1039/c5cc05166e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural and magnetic data for the Mn(i) dialkyl anionic salts [K2(18-crown-6)3][Mn{C(SiMe3)3}2]2 and [K(15-crown-5)2][Mn{C(SiMe3)3}2] are presented, indicating that these complexes possess a non-degenerate S = 2 ground state owing to 4s–3dz2 mixing upon reduction from the Mn(ii) parent complexes.
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Affiliation(s)
- C.-Y. Lin
- Department of Chemistry
- University of California
- Davis
- USA
| | | | - N. F. Chilton
- School of Chemistry
- The University of Manchester
- Manchester
- UK
| | - A. Formanuik
- School of Chemistry
- The University of Manchester
- Manchester
- UK
| | - F. Grandjean
- Department of Chemistry
- Missouri University of Science and Technology
- University of Missouri
- Rolla
- USA
| | - G. J. Long
- Department of Chemistry
- Missouri University of Science and Technology
- University of Missouri
- Rolla
- USA
| | - P. P. Power
- Department of Chemistry
- University of California
- Davis
- USA
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9
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Stollenz M, Taher D, Bhuvanesh N, Reibenspies JH, Baranová Z, Gladysz JA. Steric control of the in/out sense of bridgehead substituents in macrobicyclic compounds: isolation of new “crossed chain” variants of in/out isomers. Chem Commun (Camb) 2015; 51:16053-6. [DOI: 10.1039/c5cc05620a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
When an in,out isomer of a macrobicyclic dibridgehead diphosphine is combined with two equiv. of a gold(i) Lewis acid of sufficient bulk, the resulting adduct is obtained as a topologically novel out,out isomer with “crossed chains”.
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Affiliation(s)
| | - Deeb Taher
- Department of Chemistry
- Texas A&M University
- College Station
- USA
| | | | | | - Zuzana Baranová
- Department of Chemistry
- Texas A&M University
- College Station
- USA
| | - John A. Gladysz
- Department of Chemistry
- Texas A&M University
- College Station
- USA
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10
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Prince BM, Cundari TR, Tymczak CJ. DFT study of the reaction of a two-coordinate iron(II) dialkyl complex with molecular oxygen. J Phys Chem A 2014; 118:11056-61. [PMID: 25355170 DOI: 10.1021/jp5082438] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
DFT studies are reported of a monomeric iron dialkyl for which oxygen atom insertion into metal-methyl bonds occurs with O2: FeMe2 + O2 → Fe(OMe)2. Computation of the reaction coordinate implicates the intermediacy of Fe(III)-peroxo, Fe(VI)-dioxo, and Fe(IV)-oxo intermediates, connected by O2 oxidative addition and two methyl migration steps. Analysis of the reaction of O2 with d(6)-Fe(Me)2 indicates that oxy-insertion for this iron complex occurs with lower free energy barriers than competing homolytic/radical pathways, exploiting "spin-flip" processes via minimum energy crossing points (MECPs).
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Affiliation(s)
- Bruce M Prince
- Center for Research on Complex Networks (CRCN), Department of Physics, Texas Southern University , Houston, Texas 77004, United States
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Affiliation(s)
- Artem Schröder
- Institut für Anorganische
Chemie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
| | - Enno Lork
- Institut für Anorganische
Chemie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
| | - Jens Beckmann
- Institut für Anorganische
Chemie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
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12
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Prabhu P, Doan TNT, Tiwari M, Singh R, Kim SC, Hong MK, Kang YC, Kang LW, Lee JK. Structure-based studies on the metal binding of two-metal-dependent sugar isomerases. FEBS J 2014; 281:3446-59. [PMID: 24925069 DOI: 10.1111/febs.12872] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Revised: 05/30/2014] [Accepted: 06/09/2014] [Indexed: 11/30/2022]
Abstract
UNLABELLED Two-metal-dependent sugar isomerases are important in the synthesis of rare sugars. Many of their properties, specifically their metal dependency, have not been sufficiently explored. Here we used X-ray crystallography, site-directed mutagenesis, isothermal titration calorimetry and electron paramagnetic resonance spectroscopy to investigate the molecular determinants of the metal-binding affinity of l-rhamnose isomerase, a two-Mn(2+) -dependent isomerase from Bacillus halodurans (BHRI). The crystal structure of BHRI confirmed the presence of two metal ion-binding sites: a structural metal ion-binding site for substrate binding, and a catalytic metal ion-binding site that catalyzes a hydride shift. One conserved amino acid, W38, in wild-type BHRI was identified as a critical residue for structural Mn(2+) binding and thus the catalytic efficiency of BHRI. This function of W38 was explored by replacing it with other amino acids. Substitution by Phe, His, Lys, Ile or Ala caused complete loss of catalytic activity. The role of W38 was further examined by analyzing the crystal structure of wild-type BHRI and two inactive mutants of BHRI (W38F and W38A) in complex with Mn(2+) . A structural comparison of the mutants and the wild-type revealed differences in their coordination of Mn(2+) , including changes in metal-ligand bond length and affinity for Mn(2+) . The role of W38 was further confirmed in another two-metal-dependent enzyme: xylose isomerase from Bacillus licheniformis. These data suggest that W38 stabilizes protein-metal complexes and in turn assists ligand binding during catalysis in two-metal-dependent isomerases. STRUCTURED DIGITAL ABSTRACT BHRI and BHRI bind by x-ray crystallography (View interaction).
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Affiliation(s)
- Ponnandy Prabhu
- Department of Bioscience and Biotechnology, Konkuk University, Seoul, Korea
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13
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Chadha P, Emslie DJH, Jenkins HA. Manganese(II) Alkyl/π-Allyl Complexes Resistant to Ligand Redistribution. Organometallics 2014. [DOI: 10.1021/om500101m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Preeti Chadha
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S
4M1, Canada
| | - David J. H. Emslie
- Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S
4M1, Canada
| | - Hilary A. Jenkins
- McMaster Analytical X-Ray Diffraction Facility,
Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
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14
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Gridley BM, Moxey GJ, Lewis W, Blake AJ, Kays DL. Conformational Isomerism in Monomeric, Low-Coordinate Group 12 Complexes Stabilized by a Naphthyl-Substitutedm-Terphenyl Ligand. Chemistry 2013; 19:11446-53. [DOI: 10.1002/chem.201301872] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Indexed: 11/07/2022]
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15
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Gridley BM, Blundell TJ, Moxey GJ, Lewis W, Blake AJ, Kays DL. Cubane and dicubane complexes stabilised by sterically demanding m-terphenyl ligands. Chem Commun (Camb) 2013; 49:9752-4. [DOI: 10.1039/c3cc46384b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Harford PJ, Wheatley AEH. Alkali/coinage metals – organolithium, organocuprate chemistry. ORGANOMETALLIC CHEMISTRY 2012. [DOI: 10.1039/9781849734868-00091] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Part 1 of this chapter reviews coordination compounds of the alkali metals that contain a carbon-metal bond, looking firstly at organolithiums involving simple silanes. The use of aryl, alkynyl and N-donor ligands is also discussed. Compounds of the coinage metals - copper, silver and gold - are discussed in Part 2 of the review. Discussion is broken down by metal, with copper being considered first. Compounds containing, among others, alkene, amido and phosphido ligands are discussed, along with the significant amount of work on carbene complexes. This interest in carbene complexes is also noted within the silver and gold sections that follow, with a large number of new compounds being described. Polymeric chains and networks containing silver centres have attracted considerable interest and are described, along with the luminescent properties of a selection of novel gold species. This part of the review is completed by coverage of mixed-coinage metal structures, where the systems are found to display luminescent properties. Here again, the compounds discussed contain at least one carbon-metal bond.
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Affiliation(s)
- Philip J. Harford
- Department of Chemistry University of Cambridge, Lensfield Road, Cambridge, CB2 1EW U.K
| | - Andrew E. H. Wheatley
- Department of Chemistry University of Cambridge, Lensfield Road, Cambridge, CB2 1EW U.K
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17
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Zlatogorsky S, Ingleson MJ. Synthesis and solvent dependent reactivity of chelating bis-N-heterocyclic carbene complexes of Fe(II) hydrides. Dalton Trans 2012; 41:2685-93. [DOI: 10.1039/c2dt12048h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Franz D, Haghiri Ilkhechi A, Bolte M, Lerner H, Wagner M. A Quest for Ligand‐Unsupported Li
+
–π Interactions in Mono‐, Di‐, and Tritopic Lithium Arylborates. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100824] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daniel Franz
- Institut für Anorganische Chemie, J. W. Goethe‐Universität Frankfurt, Max‐von‐Laue‐Strasse 7, 60438 Frankfurt (Main), Germany, Fax: +49‐69‐798‐29260
| | - Alireza Haghiri Ilkhechi
- Institut für Anorganische Chemie, J. W. Goethe‐Universität Frankfurt, Max‐von‐Laue‐Strasse 7, 60438 Frankfurt (Main), Germany, Fax: +49‐69‐798‐29260
| | - Michael Bolte
- Institut für Anorganische Chemie, J. W. Goethe‐Universität Frankfurt, Max‐von‐Laue‐Strasse 7, 60438 Frankfurt (Main), Germany, Fax: +49‐69‐798‐29260
| | - Hans‐Wolfram Lerner
- Institut für Anorganische Chemie, J. W. Goethe‐Universität Frankfurt, Max‐von‐Laue‐Strasse 7, 60438 Frankfurt (Main), Germany, Fax: +49‐69‐798‐29260
| | - Matthias Wagner
- Institut für Anorganische Chemie, J. W. Goethe‐Universität Frankfurt, Max‐von‐Laue‐Strasse 7, 60438 Frankfurt (Main), Germany, Fax: +49‐69‐798‐29260
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Stauber JM, Wadler AL, Moore CE, Rheingold AL, Figueroa JS. Coordination properties of 2,5-dimesitylpyridine: an encumbering and versatile ligand for transition-metal chemistry. Inorg Chem 2011; 50:7309-16. [PMID: 21710998 DOI: 10.1021/ic201205p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
To overcome the unfavorable steric pressures associated with 2,6-disubstitution in encumbering pyridine ligands, the coordination chemistry of a 2,5-disubstituted variant, namely, 2,5-dimesitylpyridine (2,5-Mes(2)py), is reported. This diaryl pyridine shows good binding ability to a range of transition-metal fragments with varying formal oxidation states and coligands. Treatment of 2.0 equiv of 2,5-Mes(2)py with monovalent Cu and Ag triflate sources generates complexes of the type [M(2,5-Mes(2)py)(2)]OTf (M = Cu, Ag; OTf = OSO(2)CF(3)), which feature long M-OTf distances and a substrate-accessible primary coordination sphere. Combination of 2,5-Mes(2)py with Cu(OTf)(2) and Pd(OAc)(2) produces four-coordinate complexes featuring cis- and trans-2,5-Mes(2)py orientations, respectively. The four-coordinate palladium complex Pd(OAc)(2)(2,5-Mes(2)py)(2) is found to resist py-ligand dissociation at room temperature in solution, but functions as a precatalyst for the aerobic C-H bond olefination of benzene at elevated temperatures. This C-H bond activation chemistry is compared with a similar Pd-based system featuring 2,6-disubstituted pyridines. 2,5-Mes(2)py also readily supports mono- and dinuclear divalent Co complexes, and the solution-phase equilibria between such species are detailed. The coordination studies presented highlight the potential of 2,5-Mes(2)py to function as an encumbering ancillary for the stabilization of low-coordinate complexes and as a supporting ligand for metal-mediated transformations.
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Affiliation(s)
- Julia M Stauber
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093-0358, USA
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