1
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Keilwerth M, Mao W, Malischewski M, Jannuzzi SAV, Breitwieser K, Heinemann FW, Scheurer A, DeBeer S, Munz D, Bill E, Meyer K. The synthesis and characterization of an iron(VII) nitrido complex. Nat Chem 2024; 16:514-520. [PMID: 38291260 PMCID: PMC10997499 DOI: 10.1038/s41557-023-01418-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 12/08/2023] [Indexed: 02/01/2024]
Abstract
Complexes of iron in high oxidation states are captivating research subjects due to their pivotal role as active intermediates in numerous catalytic processes. Structural and spectroscopic studies of well-defined model complexes often provide evidence of these intermediates. In addition to the fundamental molecular and electronic structure insights gained by these complexes, their reactivity also affects our understanding of catalytic reaction mechanisms for small molecule and bond-activation chemistry. Here, we report the synthesis, structural and spectroscopic characterization of a stable, octahedral Fe(VI) nitrido complex and an authenticated, unique Fe(VII) species, prepared by one-electron oxidation. The super-oxidized Fe(VII) nitride rearranges to an Fe(V) imide through an intramolecular amination mechanism and ligand exchange, which is characterized spectroscopically and computationally. This enables combined reactivity and stability studies on a single molecular system of a rare high-valent complex redox pair. Quantum chemical calculations complement the spectroscopic parameters and provide evidence for a diamagnetic (S = 0) d 2 Fe(VI) and a genuine S = 1/2, d 1 Fe(VII) configuration of these super-oxidized nitrido complexes.
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Affiliation(s)
- Martin Keilwerth
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Weiqing Mao
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Moritz Malischewski
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Inorganic Chemistry, Berlin, Germany
| | - Sergio A V Jannuzzi
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Kevin Breitwieser
- Saarland University, Inorganic Chemistry, Coordination Chemistry, Saarbrücken, Germany
| | - Frank W Heinemann
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Andreas Scheurer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany.
| | - Dominik Munz
- Saarland University, Inorganic Chemistry, Coordination Chemistry, Saarbrücken, Germany.
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Karsten Meyer
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Erlangen, Germany.
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2
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Hossack C, Cahill C, Besson C. Utility of all-pyrazole heteroscorpionates in f-element chemistry. Dalton Trans 2023; 52:17656-17665. [PMID: 37943084 DOI: 10.1039/d3dt02737f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
Since their discovery in 1966, scorpionate ligands have been utilized to make coordination compounds for a variety of applications such as: studying organometallic reactions, biomimetic complexes, light-emitting materials and single-ion magnets. The recent development of a solvent-free pyrazole substitution chemistry has yielded the quantitative synthesis of asymmetrically functionalized all-pyrazole heteroscorpionate ligands. In this frontier article, we highlight the utility of all-pyrazole heteroscorpionates, specifically, nitro-trispyrazolylborates, in f-element chemistry. They offer great versatility in coordinating ability, donor strength, steric bulk and even optical charge transfer properties, all of which can be used to tune the properties of resultant complexes with metal ions. We show how they can impart structural diversity, sensitize Ln3+ luminescence and engender magnetic anisotropy and slow magnetic relaxation in the ion they coordinate. Additionally, we comment on the future of functionalized trispyrazolyl scorpionates, which includes enabling post-synthetic modifications of f-element complexes and becoming a platform to study the electronic properties of low oxidation state actinides.
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Affiliation(s)
- Christopher Hossack
- Department of Chemistry, The George Washington University, 800 22nd Street, NW, Washington, D.C. 20052, USA.
| | - Christopher Cahill
- Department of Chemistry, The George Washington University, 800 22nd Street, NW, Washington, D.C. 20052, USA.
| | - Claire Besson
- Department of Chemistry, The George Washington University, 800 22nd Street, NW, Washington, D.C. 20052, USA.
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3
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Keilwerth M, Mao W, Jannuzzi SAV, Grunwald L, Heinemann FW, Scheurer A, Sutter J, DeBeer S, Munz D, Meyer K. From Divalent to Pentavalent Iron Imido Complexes and an Fe(V) Nitride via N-C Bond Cleavage. J Am Chem Soc 2023; 145:873-887. [PMID: 36583993 DOI: 10.1021/jacs.2c09072] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
As key intermediates in metal-catalyzed nitrogen-transfer chemistry, terminal imido complexes of iron have attracted significant attention for a long time. In search of versatile model compounds, the recently developed second-generation N-anchored tris-NHC chelating ligand tris-[2-(3-mesityl-imidazole-2-ylidene)-methyl]amine (TIMMNMes) was utilized to synthesize and compare two series of mid- to high-valent iron alkyl imido complexes, including a reactive Fe(V) adamantyl imido intermediate en route to an isolable Fe(V) nitrido complex. The chemistry toward the iron adamantyl imides was achieved by reacting the Fe(I) precursor [(TIMMNMes)FeI(N2)]+ (1) with 1-adamantyl azide to yield the corresponding trivalent iron imide. Stepwise chemical reduction and oxidation lead to the isostructural series of low-spin [(TIMMNMes)Fe(NAd)]0,1+,2+,3+ (2Ad-5Ad) in oxidation states II to V. The Fe(V) imide [(TIMMNMes)Fe(NAd)]3+ (5Ad) is unstable under ambient conditions and converts to the air-stable nitride [(TIMMNMes)FeV(N)]2+ (6) via N-C bond cleavage. The stability of the pentavalent imide can be increased by derivatizing the nitride [(TIMMNMes)FeIV(N)]+ (7) with an ethyl group using the triethyloxonium salt Et3OPF6. This gives access to the analogous series of ethyl imides [(TIMMNMes)Fe(NEt)]0,1+,2+,3+ (2Et-5Et), including the stable Fe(V) ethyl imide. Iron imido complexes exist in a manifold of different electronic structures, ultimately controlling their diverse reactivities. Accordingly, these complexes were characterized by single-crystal X-ray diffraction analyses, SQUID magnetization, and electrochemical methods, as well as 57Fe Mössbauer, IR vibrational, UV/vis electronic absorption, multinuclear NMR, X-band EPR, and X-ray absorption spectroscopy. Our studies are complemented with quantum chemical calculations, thus providing further insight into the electronic structures of all complexes.
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Affiliation(s)
- Martin Keilwerth
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Weiqing Mao
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Sergio A V Jannuzzi
- Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Liam Grunwald
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany.,Department of Chemistry and Applied Biosciences (D-CHAB), ETH Zürich, 8093 Zürich, Switzerland
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Andreas Scheurer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Jörg Sutter
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Serena DeBeer
- Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Dominik Munz
- Inorganic Chemistry: Coordination Chemistry, Saarland University, Campus C4 1, 66123 Saarbrücken, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
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4
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Structural Characterization of Zinc and Cadmium Complexes Derived from N-(4-carboxybenzyl)pyridinium: Revisiting the Structure of (Cbp)2ZnBr2 and Influence of the Metal on Carboxylate Coordination Mode. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Qian J, Comito RJ. Site-Isolated Main-Group Tris(2-pyridyl)borate Complexes by Pyridine Substitution and Their Ring-Opening Polymerization Catalysis. Inorg Chem 2022; 61:10852-10862. [PMID: 35776081 DOI: 10.1021/acs.inorgchem.2c01289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tris(2-pyridyl)borates are an emerging class of scorpionate ligands, distinguished as exceptionally robust and electron-donating. However, the rapid formation of inert homoleptic complexes with divalent metals has so far limited their catalytic utility. We report site-isolating tris(2-pyridyl)borate ligands, bearing isopropyl, tert-butyl, and mesityl substituents at the pyridine 6-position to suppress the formation of inert homoleptic complexes. These ligands form the first 1:1 complexes between tris(2-pyridyl)borates and Mg2+, Zn2+, or Ca2+, with isopropyl-substituted TpyiPrH showing the most generality. Single-crystal X-ray diffraction analysis of the resulting complexes and comparison to density functional theory (DFT) models showed geometric distortions driven by steric repulsion between the pyridine 6-substituents and the hexamethyldisilazide (HMDS-, -N(SiMe3)2) anion. We show that this steric profile is a feature of the six-membered pyridine ring and contrasts with more established tris(pyrazolyl)borate and tris(imidazoline)borate scorpionate complexes. TpyiPrMg(HMDS) (1) and its zinc analogue are moderately active for the controlled polymerization of l-lactide, ε-caprolactone, and trimethylene carbonate. Furthermore, 1 gives controlled polymerization under more demanding melt-phase polymerization conditions at 100 °C, and block copolymerization of ε-caprolactone and trimethylene carbonate. These results will enable useful catalysis and coordination chemistry studies with tris(2-pyridyl)borates, and characterizes their structural complementarity to more familiar scorpionate ligands.
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Affiliation(s)
- Jin Qian
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
| | - Robert J Comito
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
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6
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Mandel MJ, Krieck S, Görls H, Westerhausen M. Bulky Hybrid
C‐
Scorpionate/Amidinate Complexes of Lithium and Zinc. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Miles J. Mandel
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry Chair of Inorganic Chemistry I Friedrich Schiller University Jena Humboldtstraße 8 07743 Jena Germany
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7
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Westerhausen M, J. M, Görls H. Synthesis and Structure of a New Bulky Hybrid Scorpionate/Cyclopentadienyl Ligand and its Lithium Complex. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202100385] [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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8
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Westerhausen M, Mandel MJ, Müller C, Görls H, Krieck S. Metalation of Aryl‐bis(3‐alkyl‐5‐methylpyrazol‐1‐yl)methane (Alkyl = Me, Ad; Aryl = Ph, C6H4‐2‐OH) with NaN(SiMe3)2, KN(SiMe3)2, and Ca{N(SiMe3)2}2. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202101051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Miles J. Mandel
- Friedrich-Schiller-Universität Jena: Friedrich-Schiller-Universitat Jena Institute of Inorganic and Analytical Chemistry GERMANY
| | - Christoph Müller
- Friedrich Schiller University Jena: Friedrich-Schiller-Universitat Jena Institute of Inorganic and Analytical Chemistry GERMANY
| | - Helmar Görls
- Friedrich Schiller University Jena: Friedrich-Schiller-Universitat Jena Institute of Inorganic and Analytical Chemistry GERMANY
| | - Sven Krieck
- Friedrich-Schiller-Universität Jena: Friedrich-Schiller-Universitat Jena Institute of Inorganic and Analytical Chemistry GERMANY
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9
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Qian J, Comito RJ. A Robust Vanadium(V) Tris(2-pyridyl)borate Catalyst for Long-Lived High-Temperature Ethylene Polymerization. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00334] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jin Qian
- Department of Chemistry, University of Houston, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States
| | - Robert J. Comito
- Department of Chemistry, University of Houston, 3585 Cullen Boulevard, Room 112, Houston, Texas 77204-5003, United States
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10
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Stubbe J, Neuman NI, McLellan R, Sommer MG, Nößler M, Beerhues J, Mulvey RE, Sarkar B. Isomerization Reactions in Anionic Mesoionic Carbene-Borates and Control of Properties and Reactivities in the Resulting Co II Complexes through Agostic Interactions. Angew Chem Int Ed Engl 2021; 60:499-506. [PMID: 33080102 PMCID: PMC7839553 DOI: 10.1002/anie.202013376] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Indexed: 12/31/2022]
Abstract
We present herein anionic borate-based bi-mesoionic carbene compounds of the 1,2,3-triazol-4-ylidene type that undergo C-N isomerization reactions. The isomerized compounds are excellent ligands for CoII centers. Strong agostic interactions with the "C-H"-groups of the cyclohexyl substituents result in an unusual low-spin square planar CoII complex, which is unreactive towards external substrates. Such agostic interactions are absent in the complex with phenyl substituents on the borate backbone. This complex displays a high-spin tetrahedral CoII center, which is reactive towards external substrates including dioxygen. To the best of our knowledge, this is also the first investigation of agostic interactions through single-crystal EPR spectroscopy. We conclusively show here that the structure and properties of these CoII complexes can be strongly influenced through interactions in the secondary coordination sphere. Additionally, we unravel a unique ligand rearrangement for these classes of anionic mesoionic carbene-based ligands.
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Affiliation(s)
- Jessica Stubbe
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
| | - Nicolás I. Neuman
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
- Instituto de Desarrollo Tecnológico para la Industria Química CCT Santa Fe CONICET-UNLColectora Ruta Nacional 168, Km 472, Paraje El Pozo3000Santa FeArgentina
| | - Ross McLellan
- WestCHEMDepartment of Pure & Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Michael G. Sommer
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
| | - Maite Nößler
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
| | - Julia Beerhues
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Robert E. Mulvey
- WestCHEMDepartment of Pure & Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Biprajit Sarkar
- Institut für Chemie und BiochemieAnorganische ChemieFreie Universität BerlinFabeckstrasse 34–3614195BerlinGermany
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversität StuttgartPfaffenwaldring 5570569StuttgartGermany
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11
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Rezaei MT, Keypour H, Bayat M, Soltani E, Jamshidi M, Gable RW. Synthesis of a tertiary amine by direct reductive amination of a carbonyl compound to form a scorpionate ligand; formation of Mn (II), Zn (II) and Cd (II) complexes, DFT calculations and, molecular docking studies. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129119] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Qamar OA, Cong C, Ma H. Solid state mononuclear divalent nickel spin crossover complexes. Dalton Trans 2020; 49:17106-17114. [PMID: 33205805 DOI: 10.1039/d0dt03421e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spin crossover complexes containing 3d4-3d7 transition metal ions with tunable electronic configurations in appropriate ligand field environments have been extensively investigated. In contrast, the development of 3d8 divalent nickel complexes displaying such a spin crossover behavior is far behind. The increasing number of X-ray single crystal structures along with magnetic evidence and thermodynamic equilibrium indicate that bistable divalent nickel complexes are gradually recognized to be a formal member of the "spin crossover family". Unfortunately, the rarity of nickel spin crossover complexes is occasionally mentioned. This Perspective article highlights examples of mononuclear 3d8 nickel spin crossover complexes in dynamic rearrangements with characterized solid state structures from the viewpoint of types of ligands utilized.
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Affiliation(s)
- Obaid Ali Qamar
- Key Laboratory of Flexible Electronics (KLOFE), Institute of Advanced Materials (IAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing 21186, China.
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13
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Stubbe J, Neuman NI, McLellan R, Sommer MG, Nößler M, Beerhues J, Mulvey RE, Sarkar B. Isomerisierungsreaktionen in anionischen mesoionischen Carbenboraten und Kontrolle der Eigenschaften und Reaktivität in den entstehenden Co
II
‐Komplexen durch agostische Wechselwirkungen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202013376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jessica Stubbe
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
| | - Nicolás I. Neuman
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
- Instituto de Desarrollo Tecnológico para la Industria Química CCT Santa Fe CONICET-UNL Colectora Ruta Nacional 168, Km 472, Paraje El Pozo 3000 Santa Fe Argentinien
| | - Ross McLellan
- WestCHEM Department of Pure & Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
| | - Michael G. Sommer
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
| | - Maite Nößler
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
| | - Julia Beerhues
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Robert E. Mulvey
- WestCHEM Department of Pure & Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstraße 34–36 14195 Berlin Deutschland
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
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14
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McSkimming A, Sridharan A, Thompson NB, Müller P, Suess DLM. An [Fe 4S 4] 3+-Alkyl Cluster Stabilized by an Expanded Scorpionate Ligand. J Am Chem Soc 2020; 142:14314-14323. [PMID: 32692919 DOI: 10.1021/jacs.0c06334] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Alkyl-ligated iron-sulfur clusters in the [Fe4S4]3+ charge state have been proposed as short-lived intermediates in a number of enzymatic reactions. To better understand the properties of these intermediates, we have prepared and characterized the first synthetic [Fe4S4]3+-alkyl cluster. Isolation of this highly reactive species was made possible by the development of an expanded scorpionate ligand suited to the encapsulation of cuboidal clusters. Like the proposed enzymatic intermediates, this synthetic [Fe4S4]3+-alkyl cluster adopts an S = 1/2 ground state with giso > 2. Mössbauer spectroscopic studies reveal that the alkylated Fe has an unusually low isomer shift, which reflects the highly covalent Fe-C bond and the localization of Fe3+ at the alkylated site in the solid state. Paramagnetic 1H NMR studies establish that this valence localization persists in solution at physiologically relevant temperatures, an effect that has not been observed for [Fe4S4]3+ clusters outside of a protein. These findings establish the unusual electronic-structure effects imparted by the strong-field alkyl ligand and lay the foundation for understanding the electronic structures of [Fe4S4]3+-alkyl intermediates in biology.
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Affiliation(s)
- Alex McSkimming
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Arun Sridharan
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Niklas B Thompson
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Peter Müller
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Daniel L M Suess
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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15
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Chen WY, Yermembetova A, Washer BM, Jiang X, Shuvo SN, Peroulis D, Wei A, Stanciu LA. Selective Detection of Ethylene by MoS 2-Carbon Nanotube Networks Coated with Cu(I)-Pincer Complexes. ACS Sens 2020; 5:1699-1706. [PMID: 32493009 DOI: 10.1021/acssensors.0c00344] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The plant hormone ethylene (C2) can induce premature fruit ripening and flower senescence at levels below 1 ppm, which has motivated efforts to develop cost-effective methods for C2 monitoring during the transport and storage of climacteric fruits. Here, we describe a nanocomposite film composed of exfoliated MoS2, single-walled carbon nanotubes (SCNTs), and Cu(I)-tris(mercaptoimidazolyl)borate complexes (Cu-Tm) for real-time detection of C2 at levels down to 100 ppb. A copercolation network of MoS2 and SCNTs was deposited onto interdigitated Ag electrodes printed on plastic substrates and then coated with Cu-Tm with a final conductance in the 0.5 mS range. Reversible changes in relative conductance (-ΔG/G0) were measured upon C2 exposure with a linear response at sub-ppm levels. The thin-film sensors were highly selective toward C2, and they responded weakly to other volatile organic compounds or water at similar partial pressures. A mechanism is proposed in which Cu-Tm behaves as a chemically sensitive n-type dopant for MoS2, based on spectroscopic characterization and density functional theory modeling. Cu-Tm-coated MoS2/SCNT sensors were also connected to a battery-powered wireless transmitter and used to monitor C2 production from various fruit samples, validating their utility as practical, field-deployable sensors.
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Affiliation(s)
- Winston Yenyu Chen
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Aiganym Yermembetova
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
| | - Benjamin M. Washer
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Xiaofan Jiang
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Shoumya Nandy Shuvo
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Dimitrios Peroulis
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Alexander Wei
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Lia A. Stanciu
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States
- Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
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Photophysics and Photochemistry of Iron Carbene Complexes for Solar Energy Conversion and Photocatalysis. Catalysts 2020. [DOI: 10.3390/catal10030315] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Earth-abundant first row transition metal complexes are important for the development of large-scale photocatalytic and solar energy conversion applications. Coordination compounds based on iron are especially interesting, as iron is the most common transition metal element in the Earth’s crust. Unfortunately, iron-polypyridyl and related traditional iron-based complexes generally suffer from poor excited state properties, including short excited-state lifetimes, that make them unsuitable for most light-driven applications. Iron carbene complexes have emerged in the last decade as a new class of coordination compounds with significantly improved photophysical and photochemical properties, that make them attractive candidates for a range of light-driven applications. Specific aspects of the photophysics and photochemistry of these iron carbenes discussed here include long-lived excited state lifetimes of charge transfer excited states, capabilities to act as photosensitizers in solar energy conversion applications like dye-sensitized solar cells, as well as recent demonstrations of promising progress towards driving photoredox and photocatalytic processes. Complementary advances towards photofunctional systems with both Fe(II) complexes featuring metal-to-ligand charge transfer excited states, and Fe(III) complexes displaying ligand-to-metal charge transfer excited states are discussed. Finally, we outline emerging opportunities to utilize the improved photochemical properties of iron carbenes and related complexes for photovoltaic, photoelectrochemical and photocatalytic applications.
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17
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Raubenheimer HG, Dobrzańska L. Interaction between Cu and Ag free ions and central metals in complexes with XHn units (X = B, Si, N, O, C, Al, Zn, Mg; n = 1, 2). Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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18
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Supramolecular first-row transition metal complexes of 3-(3,5-dimethylpyrazol-1-yl)propanamide: Three different coordination modes. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.02.056] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Fischer PJ, Senthil S, Stephan JT, Swift ML, Young VG. Seventeen-electron chromium( i)tricarbonyltris(phosphine) complexes supported by tris(phosphinomethyl)phenylborates. Dalton Trans 2019; 48:16705-16712. [DOI: 10.1039/c9dt03562a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Tris(diphenylphosphinomethyl)phenylborates permit isolation of remarkably thermally stable chromium(i)tricarbonyltris(phosphine) complexes, the first crystallographically characterized [Cr(CO)3P3]+ radicals.
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Affiliation(s)
| | | | | | | | - Victor G. Young
- Department of Chemistry
- University of Minnesota
- Minneapolis
- USA
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20
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Nishiura T, Takabatake A, Okutsu M, Nakazawa J, Hikichi S. Heteroleptic cobalt(iii) acetylacetonato complexes with N-heterocyclic carbine-donating scorpionate ligands: synthesis, structural characterization and catalysis. Dalton Trans 2019; 48:2564-2568. [DOI: 10.1039/c8dt04469d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A first structure-determined heteroleptic cobalt(iii) complex with the less hindered tris(carbene)borate works as a catalyst precursor for alkane oxidation.
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Affiliation(s)
- Toshiki Nishiura
- Department of Material and Life Chemistry
- Faculty of Engineering
- Kanagawa University
- Yokohama 221-8686
- Japan
| | - Asako Takabatake
- Department of Material and Life Chemistry
- Faculty of Engineering
- Kanagawa University
- Yokohama 221-8686
- Japan
| | - Mariko Okutsu
- Department of Material and Life Chemistry
- Faculty of Engineering
- Kanagawa University
- Yokohama 221-8686
- Japan
| | - Jun Nakazawa
- Department of Material and Life Chemistry
- Faculty of Engineering
- Kanagawa University
- Yokohama 221-8686
- Japan
| | - Shiro Hikichi
- Department of Material and Life Chemistry
- Faculty of Engineering
- Kanagawa University
- Yokohama 221-8686
- Japan
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22
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Schlapp‐Hackl I, Hassenrück C, Wurst K, Kopacka H, Müller T, Winter RF, Bildstein B. Metallo‐Scorpionates: First Generation of Trimetallic, Homoleptic [Ru]–M–[Ru] Complexes (M = Fe, Co, Ni, Cu). Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800774] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Inge Schlapp‐Hackl
- Institute of General Inorganic and Theoretical Chemistry University of Innsbruck Innrain 80‐82 6020 Innsbruck Austria
| | - Christopher Hassenrück
- Department of Chemistry University of Konstanz Universitätsstrasse 10 784557 Konstanz Germany
| | - Klaus Wurst
- Institute of General Inorganic and Theoretical Chemistry University of Innsbruck Innrain 80‐82 6020 Innsbruck Austria
| | - Holger Kopacka
- Institute of General Inorganic and Theoretical Chemistry University of Innsbruck Innrain 80‐82 6020 Innsbruck Austria
| | - Thomas Müller
- Institute of Organic Chemistry University of Innsbruck Center for Chemistry and Biomedicine Innrain 80‐82 6020 Innsbruck Austria
| | - Rainer F. Winter
- Department of Chemistry University of Konstanz Universitätsstrasse 10 784557 Konstanz Germany
| | - Benno Bildstein
- Institute of General Inorganic and Theoretical Chemistry University of Innsbruck Innrain 80‐82 6020 Innsbruck Austria
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23
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Al-Harbi A, Hammond MJ, Parkin G. Organometallic Zirconium Compounds in an Oxygen-Rich Coordination Environment: Synthesis and Structural Characterization of Tris(oxoimidazolyl)hydroboratozirconium Compounds. Inorg Chem 2018; 57:1426-1437. [PMID: 29314851 DOI: 10.1021/acs.inorgchem.7b02832] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of tris(oxoimidazolyl)hydroborato ligands, which serve as L2X [O3] donors, have been employed to obtain organometallic zirconium compounds in an uncommon oxygen-rich coordination environment. For example, Cp[ToMeBenz]ZrCl2 has been synthesized via the reaction of [ToMeBenz]Na with CpZrCl3 and bears a structural resemblance to the bent metallocene dichloride derivative Cp2ZrCl2. In addition, the half-sandwich counterparts [ToMeBenz]ZrCl3 and [ToBut]ZrCl3 have been obtained by metathesis of ZrCl4 with [ToMeBenz]Na and [ToBut]Na, respectively. The structurally related zirconium benzyl compounds [ToRBenz]Zr(CH2Ph)3 (R = Me, But, 1-Ad) have also been synthesized via the reactions of [ToRBenz]Tl with Zr(CH2Ph)4, and X-ray diffraction studies demonstrate that the benzyl ligands in these compounds are conformationally flexible and exhibit a large range of Zr-CH2-Ph bond angles (94.7-131.7°). Protolytic cleavage of one of the benzyl ligands of [ToRBenz]Zr(CH2Ph)3 (R = But, 1-Ad) may be achieved by treatment with [PhNHMe2][B(C6F5)4] to generate {[ToRBenz]Zr(CH2Ph)2}[B(C6F5)4], which are catalysts for the polymerization of ethylene. The molecular structure of the ether adduct, {[ToButBenz]Zr(CH2Ph)2(OEt2)}[B(C6F5)4], has been determined by X-ray diffraction. In addition to the use of tris(oxoimidazolyl)hydroborato ligands, bis(oxoimidazolyl)hydroborato ligands have also been used to obtain zirconium benzyl compounds in oxygen-rich environments, namely, [BoMeBenz]2Zr(CH2Ph)2 and [BoAdBenz]2Zr(CH2Ph)2.
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Affiliation(s)
- Ahmed Al-Harbi
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Matthew J Hammond
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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24
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Fischer PJ, Senthil S, Stephan JT, Swift ML, Storlie MD, Chan ET, Vollmer MV, Young VG. Inductive modulation of tris(phosphinomethyl)phenylborate donation at group VI metals via borate phenyl substituent modification. Dalton Trans 2018; 47:6166-6176. [DOI: 10.1039/c8dt00703a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
New tris(phosphinomethyl)phenylborate ligands were synthesized to examine tuning of PhBPPh3 donation via inductive modulation of the borate charge. Cyclic voltammetry suggests that rational tuning of this type occurs in complexes of zerovalent metals.
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Affiliation(s)
| | | | | | | | | | - Emily T. Chan
- Department of Chemistry
- Macalester College
- Saint Paul
- USA
| | | | - Victor G. Young
- Department of Chemistry
- University of Minnesota
- Minneapolis
- USA
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25
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Su WJ, Liang LC. Elusive Scorpionates: C3-Symmetric, Formally Dianionic, Facially Tridentate Ligands. Inorg Chem 2017; 57:553-556. [PMID: 29280615 DOI: 10.1021/acs.inorgchem.7b02884] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Wei-Jia Su
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Lan-Chang Liang
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
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26
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Al-Harbi A, Kriegel B, Gulati S, Hammond MJ, Parkin G. Bis- and Tris(2-oxobenzimidazolyl)hydroborato Complexes of Sodium and Thallium: New Classes of Bidentate and Tridentate Oxygen Donor Ligands. Inorg Chem 2017; 56:15271-15284. [PMID: 29210574 DOI: 10.1021/acs.inorgchem.7b02638] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of bis- and tris(oxobenzimidazolyl)hydroborato compounds, namely, [BoRBenz]Na and [ToRBenz]-Na (R = Me, But, Ad), which feature uncommon sterically demanding LX [O2] and L2X [O3] donor ligands, have been obtained via the reactions of NaBH4 with 1-R-1,3-dihydro-2H-benzimidazol-2-ones. Evidence that the alkyl substituents are suitably located to have a significant impact on the coordination environment is provided by the observation that the methyl derivative [ToMeBenz]Na(κ3-diglyme) exhibits κ3-coordination of the diglyme, whereas the t-butyl and adamantyl derivatives, [ToButBenz]Na(κ2-diglyme) and [ToAdBenz]Na(κ2-diglyme), exhibit κ2-coordination. The [BoRBenz] and [ToRBenz] ligands also allow for isolation of discrete mononuclear thallium compounds, [BoRBenz]Tl and [ToRBenz]Tl, for which the steric demands of the ligands have been quantified in terms of both cone angle and buried volume concepts.
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Affiliation(s)
- Ahmed Al-Harbi
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Benjamin Kriegel
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Shivani Gulati
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Matthew J Hammond
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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27
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Maity AK, Murillo J, Metta-Magaña AJ, Pinter B, Fortier S. A Terminal Iron(IV) Nitride Supported by a Super Bulky Guanidinate Ligand and Examination of Its Electronic Structure and Reactivity. J Am Chem Soc 2017; 139:15691-15700. [PMID: 28953380 DOI: 10.1021/jacs.7b06919] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Utilizing the bulky guanidinate ligand [LAr*]- (LAr* = (Ar*N)2C(R), Ar* = 2,6-bis(diphenylmethyl)-4-tert-butylphenyl, R = NCtBu2) for kinetic stabilization, the synthesis of a rare terminal Fe(IV) nitride complex is reported. UV irradiation of a pyridine solution of the Fe(II) azide [LAr*]FeN3(py) (3-py) at 0 °C cleanly generates the Fe(IV) nitride [LAr*]FeN(py) (1). The 15N NMR spectrum of the 115N (50% Fe≡15N) isotopomer shows a resonance at 1016 ppm (vs externally referenced CH3NO2 at 380 ppm), comparable to that known for other terminal iron nitrides. Notably, the computed structure of 1 reveals an iron center with distorted tetrahedral geometry, τ4 = 0.72, featuring a short Fe≡N bond (1.52 Å). Inspection of the frontier orbital ordering of 1 shows a relatively small HOMO/LUMO gap with the LUMO comprised by Fe(dxz,yz)N(px,y) π*-orbitals, a splitting that is manifested in the electronic absorption spectrum of 1 (λ = 610 nm, ε = 1375 L·mol-1·cm-1; λ = 613 nm (calcd)). Complex 1 persists in low-temperature solutions of pyridine but becomes unstable at room temperature, gradually converting to the Fe(II) hydrazide product [κ2-(tBu2CN)C(η6-NAr*)(N-NAr*)]Fe (4) upon standing via intramolecular N-atom insertion. This reactivity of the Fe≡N moiety was assessed through molecular orbital analysis, which suggests electrophilic character at the nitride functionality. Accordingly, treatment of 1 with the nucleophiles PMe2Ph and Ar-N≡C (Ar = 2,6-dimethylphenyl) leads to partial N-atom transfer and formation of the Fe(II) addition products [LAr*]Fe(N═PMe2Ph)(py) (5) and [LAr*]Fe(N═C═NAr)(py) (6). Similarly, 1 reacts with PhSiH3 to give [LAr*]Fe[N(H)(SiH2Ph)](py) (7) which Fukui analysis shows to proceed via electrophilic insertion of the nitride into the Si-H bond.
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Affiliation(s)
- Arnab K Maity
- Department of Chemistry, University of Texas at El Paso , El Paso, Texas 79968, United States
| | - Jesse Murillo
- Department of Chemistry, University of Texas at El Paso , El Paso, Texas 79968, United States
| | | | - Balazs Pinter
- Computational OrganoMetallic and Inorganic Chemistry Group, Eenheid Algemene Chemie, Vrije Universiteit Brussel , Pleinlaan 2, Brussels 1050, Belgium
| | - Skye Fortier
- Department of Chemistry, University of Texas at El Paso , El Paso, Texas 79968, United States
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28
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Ahmed BM, Rudell NA, Soto I, Mezei G. Reaction of Amines with Aldehydes and Ketones Revisited: Access To a Class of Non-Scorpionate Tris(pyrazolyl)methane and Related Ligands. J Org Chem 2017; 82:10549-10562. [DOI: 10.1021/acs.joc.7b02070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Basil M. Ahmed
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States
| | - Nicholas A. Rudell
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States
| | - Ixtlazihuatl Soto
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States
| | - Gellert Mezei
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States
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29
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Saha K, Ramalakshmi R, Gomosta S, Pathak K, Dorcet V, Roisnel T, Halet JF, Ghosh S. Design, Synthesis, and Chemistry of Bis(σ)borate and Agostic Complexes of Group 7 Metals. Chemistry 2017; 23:9812-9820. [PMID: 28444699 DOI: 10.1002/chem.201701423] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Indexed: 11/06/2022]
Abstract
A series of new bis(σ)borate and agostic complexes of group 7 metals have been synthesized and structurally characterized from various borate ligands, such as trihydrobis(benzothiazol-2-yl)amideborate (Na[(H3 B)bbza]), trihydro(2-aminobenzothiazolyl)borate (Na[(H3 B)abz]), and dihydrobis(2-mercaptopyridyl)borate (Na[(H2 B)mp2 ]) (bbza=bis(benzothiazol-2-yl)amine, abz=2-aminobenzothiazolyl, and mp=2-mercaptopyridyl). Photolysis of [Mn2 (CO)10 ] with Na[(H3 B)bbza] formed bis(σ)borate complex [Mn(CO)3 (μ-H)2 BHNCSC6 H4 (NR)] (1; R=NCSC6 H4 ). Octahedral complex [Re(CO)2 (N3 C2 S2 C12 H8 )2 ] (2) was generated under similar reaction conditions with [Re2 (CO)10 ]. Similarly, when [Mn2 (CO)10 ] was treated with Na[(H3 B)abz], bis(σ)borate complex [Mn(CO)3 (μ-H)2 BH(HN2 CSC6 H4 )] (3) and the agostic complex [Mn(CO)3 (μ-H)BH(HN2 CSC6 H4 )2 ] (4) were formed. To probe the potential formation of agostic complexes of the heavier group 7 metals, we carried out the photolysis of [M2 (CO)10 ] with Na[(H2 B)mp2 ] and found that [M(CO)3 (μ-H)BH(C5 H4 NS)2 ] (5: M=Re; 6: M=Mn) was formed in moderate yield. Complexes 1 and 3 feature a (κ3 -H,H,N) coordination mode, whereas 4, 5, and 6 display both (κ3 -H,N,N) and (κ3 -H,S,S) modes of the corresponding ligands. To investigate the lability of the CO ligands of 1 and 3, we treated the complexes with phosphine ligands that generated novel bis(σ)borate complexes [Mn(μ-H)2 (BHNCSC6 H4 )(NR)(CO)2 PL2 L'] (R=NCSC6 H4 ; 7 a: L=L'=Ph; 7 b: L=Ph, L'=Me) and [Mn(μ-H)2 BHN(NCSC6 H4 )R(CO)2 PL2 L'] (R=NCSC6 H4 ; 8 a: L=L'=Ph; 8 b: L=Ph, L'=Me). Complexes 7 and 8 are structural isomers with different coordination modes of the bbza ligand. In addition, DFT calculations were performed to shed some light on the bonding and electronic structures of these complexes.
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Affiliation(s)
- Koushik Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Rongala Ramalakshmi
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Suman Gomosta
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Kriti Pathak
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Vincent Dorcet
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS, Ecole Nationale Supérieure de Chimie de Rennes-Université de Rennes 1, 35042, Rennes Cedex, France
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS, Ecole Nationale Supérieure de Chimie de Rennes-Université de Rennes 1, 35042, Rennes Cedex, France
| | - Jean-François Halet
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS, Ecole Nationale Supérieure de Chimie de Rennes-Université de Rennes 1, 35042, Rennes Cedex, France
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
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30
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Ruccolo S, Rauch M, Parkin G. Tris[(1-isopropylbenzimidazol-2-yl)dimethylsilyl]methyl metal complexes, [Tism PriBenz]M: a new class of metallacarbatranes, isomerization to a tris(N-heterocyclic carbene) derivative, and evidence for an inverted ligand field. Chem Sci 2017; 8:4465-4474. [PMID: 30155219 PMCID: PMC6100236 DOI: 10.1039/c7sc00499k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 03/27/2017] [Indexed: 11/22/2022] Open
Abstract
The tris[(1-isopropylbenzimidazol-2-yl)dimethylsilyl]methyl ligand, [TismPriBenz], has been employed to form carbatrane compounds of both the main group metals and transition metals, namely [TismPriBenz]Li, [TismPriBenz]MgMe, [TismPriBenz]Cu and [TismPriBenz]NiBr. In addition to the formation of atranes, a zinc compound that exhibits κ3-coordination, namely [κ3-TismPriBenz]ZnMe, has also been obtained. Furthermore, the [TismPriBenz] ligand may undergo a thermally induced rearrangement to afford a novel tripodal tris(N-heterocyclic carbene) variant, as shown by the conversion of [TismPriBenz]Cu to [κ4-C4-TismPriBenz*]Cu. The transannular M-C bond lengths in the atrane compounds are 0.19-0.32 Å longer than the sum of the respective covalent radii, which is consistent with a bonding description that features a formally zwitterionic component. Interestingly, computational studies demonstrate that the Cu-Catrane interactions in [TismPriBenz]Cu and [κ4-C4-TismPriBenz*]Cu are characterized by an "inverted ligand field", in which the occupied antibonding orbitals are localized more on carbon than on copper.
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Affiliation(s)
- Serge Ruccolo
- Department of Chemistry , Columbia University , New York 10027 , USA .
| | - Michael Rauch
- Department of Chemistry , Columbia University , New York 10027 , USA .
| | - Gerard Parkin
- Department of Chemistry , Columbia University , New York 10027 , USA .
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31
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Amenta DS, Liebing P, Biero JE, Sherman RJ, Gilje JW, Edelmann FT. Synthesis and crystal structures of three new benzotriazolylpropanamides. Acta Crystallogr E Crystallogr Commun 2017; 73:880-885. [PMID: 28638650 PMCID: PMC5458315 DOI: 10.1107/s2056989017007472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 05/20/2017] [Indexed: 11/25/2022]
Abstract
The base-catalyzed Michael addition of 2-methyl-acryl-amide to benzotriazole afforded 3-(1H-benzotriazol-1-yl)-2-methyl-propanamide, C10H12N4O (1), in 32% yield in addition to small amounts of isomeric 3-(2H-benzotriazol-2-yl)-2-methyl-propanamide, C10H12N4O (2). In a similar manner, 3-(1H-benzotriazol-1-yl)-N,N-di-methyl-propanamide, C11H14N4O (3), was prepared from benzotriazole and N,N-di-methyl-acryl-amide. All three products have been structurally characterized by single-crystal X-ray diffraction. The crystal structures of 1 and 2 comprise infinite arrays formed by N-H⋯O and N-H⋯N bridges, as well as π-π inter-actions, while the mol-ecules of 3 are aggregated to simple π-dimers in the crystal.
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Affiliation(s)
- Donna S. Amenta
- Chemistry Department, James Madison University, Harrisonburg, VA 22807, USA
| | - Phil Liebing
- Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
| | - Julia E. Biero
- Chemistry Department, James Madison University, Harrisonburg, VA 22807, USA
| | - Robert J. Sherman
- Chemistry Department, James Madison University, Harrisonburg, VA 22807, USA
| | - John W. Gilje
- Chemistry Department, James Madison University, Harrisonburg, VA 22807, USA
| | - Frank T. Edelmann
- Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
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32
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Harris JP, Reber C, Colmer HE, Jackson TA, Forshaw AP, Smith JM, Kinney RA, Telser J. Near-infrared 2Eg → 4A2g and visible LMCT luminescence from a molecular bis-(tris(carbene)borate) manganese(IV) complex. CAN J CHEM 2017. [DOI: 10.1139/cjc-2016-0607] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The molecular bis-(tris(carbene)borate) manganese(IV) complex [{PhB(MeIm)3}2Mn](OTf)2 shows 2Eg → 4A2g luminescence at 828 nm in the solid state at 85 K; this wavelength is longer by approximately 100 nm than the wavelengths typically observed for manganese(IV) and chromium(III) doped solids and for molecular chromium(III) complexes. Weak luminescence is also observed from a LMCT excited state with an absorption maximum at 500 nm. This represents the first molecular manganese(IV) compound for which luminescence has been reported.
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Affiliation(s)
- Joe P. Harris
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Christian Reber
- Département de chimie, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Hannah E. Colmer
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA
| | | | - Adam P. Forshaw
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA
| | - Jeremy M. Smith
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA
| | - R. Adam Kinney
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, IL 60605, USA
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33
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Kreider-Mueller A, Quinlivan PJ, Owen JS, Parkin G. Tris(2-mercaptoimidazolyl)hydroborato Cadmium Thiolate Complexes, [Tm But]CdSAr: Thiolate Exchange at Cadmium in a Sulfur-Rich Coordination Environment. Inorg Chem 2017; 56:4644-4654. [PMID: 28368611 PMCID: PMC5461919 DOI: 10.1021/acs.inorgchem.7b00296] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Indexed: 11/30/2022]
Abstract
A series of cadmium thiolate compounds that feature a sulfur-rich coordination environment, namely [TmBut]CdSAr, have been synthesized by the reactions of [TmBut]CdMe with ArSH (Ar = C6H4-4-F, C6H4-4-But, C6H4-4-OMe, and C6H4-3-OMe). In addition, the pyridine-2-thiolate and pyridine-2-selenolate derivatives, [TmBut]CdSPy and [TmBut]CdSePy have been obtained via the respective reactions of [TmBut]CdMe with pyridine-2-thione and pyridine-2-selone. The molecular structures of [TmBut]CdSAr and [TmBut]CdEPy (E = S or Se) have been determined by X-ray diffraction and demonstrate that, in each case, the [CdS4] motif is distorted tetrahedral and approaches a trigonal monopyramidal geometry in which the thiolate ligand adopts an equatorial position; [TmBut]CdSPy and [TmBut]CdSePy, however, exhibit an additional long-range interaction with the pyridyl nitrogen atoms. The ability of the thiolate ligands to participate in exchange was probed by 1H and 19F nuclear magnetic resonance (NMR) spectroscopic studies of the reactions of [TmBut]CdSC6H4-4-F with ArSH (Ar = C6H4-4-But or C6H4-4-OMe), which demonstrate that (i) exchange is facile and (ii) coordination of thiolate to cadmium is most favored for the p-fluorophenyl derivative. Furthermore, a two-dimensional EXSY experiment involving [TmBut]CdSC6H4-4-F and 4-fluorothiophenol demonstrates that degenerate thiolate ligand exchange is also facile on the NMR time scale.
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Affiliation(s)
- Ava Kreider-Mueller
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Patrick J. Quinlivan
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Jonathan S. Owen
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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34
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Bucinsky L, Breza M, Lee WT, Hickey AK, Dickie DA, Nieto I, DeGayner JA, Harris TD, Meyer K, Krzystek J, Ozarowski A, Nehrkorn J, Schnegg A, Holldack K, Herber RH, Telser J, Smith JM. Spectroscopic and Computational Studies of Spin States of Iron(IV) Nitrido and Imido Complexes. Inorg Chem 2017; 56:4752-4769. [PMID: 28379707 DOI: 10.1021/acs.inorgchem.7b00512] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
High-oxidation-state metal complexes with multiply bonded ligands are of great interest for both their reactivity as well as their fundamental bonding properties. This paper reports a combined spectroscopic and theoretical investigation into the effect of the apical multiply bonded ligand on the spin-state preferences of threefold symmetric iron(IV) complexes with tris(carbene) donor ligands. Specifically, singlet (S = 0) nitrido [{PhB(ImR)3}FeN], R = tBu (1), Mes (mesityl, 2) and the related triplet (S = 1) imido complexes, [{PhB(ImR)3}Fe(NR')]+, R = Mes, R' = 1-adamantyl (3), tBu (4), were investigated by electronic absorption and Mössbauer effect spectroscopies. For comparison, two other Fe(IV) nitrido complexes, [(TIMENAr)FeN]+ (TIMENAr = tris[2-(3-aryl-imidazol-2-ylidene)ethyl]amine; Ar = Xyl (xylyl), Mes), were investigated by 57Fe Mössbauer spectroscopy, including applied-field measurements. The paramagnetic imido complexes 3 and 4 were also studied by magnetic susceptibility measurements (for 3) and paramagnetic resonance spectroscopy: high-frequency and -field electron paramagnetic resonance (for 3 and 4) and frequency-domain Fourier-transform (FD-FT) terahertz electron paramagnetic resonance (for 3), which reveal their zero-field splitting parameters. Experimentally correlated theoretical studies comprising ligand-field theory and quantum chemical theory, the latter including both density functional theory and ab initio methods, reveal the key role played by the Fe 3dz2 (a1) orbital in these systems: the nature of its interaction with the nitrido or imido ligand dictates the spin-state preference of the complex. The ability to tune the spin state through the energy and nature of a single orbital has general relevance to the factors controlling spin states in complexes with applicability as single molecule devices.
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Affiliation(s)
- Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology , Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology , Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Wei-Tsung Lee
- Department of Chemistry, Indiana University , 800 E. Kirkwood Avenue, Bloomington, Indiana 47401, United States.,Department of Chemistry and Biochemistry, New Mexico State University , Las Cruces, New Mexico 88003, United States
| | - Anne K Hickey
- Department of Chemistry, Indiana University , 800 E. Kirkwood Avenue, Bloomington, Indiana 47401, United States
| | - Diane A Dickie
- Department of Chemistry and Chemical Biology, The University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Ismael Nieto
- Department of Chemistry and Biochemistry, New Mexico State University , Las Cruces, New Mexico 88003, United States
| | - Jordan A DeGayner
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - T David Harris
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg , Egerlandstraße 1, D-91058 Erlangen, Germany
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States
| | - Joscha Nehrkorn
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
| | | | | | - Rolfe H Herber
- Racah Institute of Physics, The Hebrew University of Jerusalem , 91904 Jerusalem, Israel
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University , Chicago, Illinois 60605, United States
| | - Jeremy M Smith
- Department of Chemistry, Indiana University , 800 E. Kirkwood Avenue, Bloomington, Indiana 47401, United States.,Department of Chemistry and Biochemistry, New Mexico State University , Las Cruces, New Mexico 88003, United States
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35
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Lam TL, Tso KCH, Cao B, Yang C, Chen D, Chang XY, Huang JS, Che CM. Tripodal S-Ligand Complexes of Copper(I) as Catalysts for Alkene Aziridination, Sulfide Sulfimidation, and C–H Amination. Inorg Chem 2017; 56:4253-4257. [DOI: 10.1021/acs.inorgchem.7b00226] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Tsz Lung Lam
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Ken Chi-Hang Tso
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Bei Cao
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Chen Yang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Daqing Chen
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Xiao-Yong Chang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Jie-Sheng Huang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
| | - Chi-Ming Che
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China
- HKU Shenzhen Institute of Research and Innovation, Shenzhen 518053, People’s Republic of China
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36
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The hydridotris(3-nitro-1,2,4-triazol-1-yl)borate, a new nitro-substituted electron withdrawing polydentate “scorpionate”-type ligand and related copper and silver phosphane complexes. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.09.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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37
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Abstract
This review presents and discusses the use of multidentate silanide ligands in transition metal chemistry depending on their ligand architecture.
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Affiliation(s)
- M. Simon
- Karlsruhe Institute of Technology (KIT)
- Institute of Inorganic Chemistry
- Devision Molecular Chemistry
- 76131 Karlsruhe
- Germany
| | - F. Breher
- Karlsruhe Institute of Technology (KIT)
- Institute of Inorganic Chemistry
- Devision Molecular Chemistry
- 76131 Karlsruhe
- Germany
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38
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Gowda AS, Baur A, Scaggs CA, Petersen JL, Hoover JM. Formation of Di-tert-butylurea from a Mononuclear Iron Tris(isocyanide) Complex. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00687] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Anitha S. Gowda
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Andreas Baur
- Department
of Biology, Chemistry, and Geoscience, Fairmont State University, Fairmont, West Virginia 26554, United States
| | - Carl A. Scaggs
- Department
of Biology, Chemistry, and Geoscience, Fairmont State University, Fairmont, West Virginia 26554, United States
| | - Jeffrey L. Petersen
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Jessica M. Hoover
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506, United States
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39
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Ding M, Cutsail III GE, Aravena D, Amoza M, Rouzières M, Dechambenoit P, Losovyj Y, Pink M, Ruiz E, Clérac R, Smith JM. A Low Spin Manganese(IV) Nitride Single Molecule Magnet. Chem Sci 2016; 7:6132-6140. [PMID: 27746891 PMCID: PMC5058364 DOI: 10.1039/c6sc01469k] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2016] [Accepted: 06/09/2016] [Indexed: 01/26/2023] Open
Abstract
Structural, spectroscopic and magnetic methods have been used to characterize the tris(carbene)borate compound PhB(MesIm)3Mn≡N as a four-coordinate manganese(IV) complex with a low spin (S = 1/2) configuration. The slow relaxation of the magnetization in this complex, i.e. its single-molecule magnet (SMM) properties, is revealed under an applied dc field. Multireference quantum mechanical calculations indicate that this SMM behavior originates from an anisotropic ground doublet stabilized by spin-orbit coupling. Consistent theoretical and experiment data show that the resulting magnetization dynamics in this system is dominated by ground state quantum tunneling, while its temperature dependence is influenced by Raman relaxation.
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Affiliation(s)
- Mei Ding
- Department of Chemistry
, Indiana University
,
800 E. Kirkwood Ave.
, Bloomington
, IN 47405
, USA
.
| | - George E. Cutsail III
- Department of Chemistry
, Northwestern University
,
2145 Sheridan Road
, Evanston
, IL 60208
, USA
| | - Daniel Aravena
- Departamento de Química de los Materiales
, Facultad de Química y Biología
, Universidad de Santiago de Chile (USACH)
,
Casilla 40, Correo 33
, Santiago
, Chile
| | - Martín Amoza
- Departament de Química Inorgànica
, Institut de Recerca de Química Teòrica i Computacional
, Universitat de Barcelona
,
Diagonal 645
, Barcelona
, 08028 Spain
.
| | - Mathieu Rouzières
- CNRS
, CRPP
, UPR 8641
,
F-33600 Pessac
, France
.
- Univ. Bordeaux
, CRPP
, UPR 8641
,
F-33600 Pessac
, France
| | - Pierre Dechambenoit
- CNRS
, CRPP
, UPR 8641
,
F-33600 Pessac
, France
.
- Univ. Bordeaux
, CRPP
, UPR 8641
,
F-33600 Pessac
, France
| | - Yaroslav Losovyj
- Department of Chemistry
, Indiana University
,
800 E. Kirkwood Ave.
, Bloomington
, IN 47405
, USA
.
| | - Maren Pink
- Department of Chemistry
, Indiana University
,
800 E. Kirkwood Ave.
, Bloomington
, IN 47405
, USA
.
| | - Eliseo Ruiz
- Departament de Química Inorgànica
, Institut de Recerca de Química Teòrica i Computacional
, Universitat de Barcelona
,
Diagonal 645
, Barcelona
, 08028 Spain
.
| | - Rodolphe Clérac
- CNRS
, CRPP
, UPR 8641
,
F-33600 Pessac
, France
.
- Univ. Bordeaux
, CRPP
, UPR 8641
,
F-33600 Pessac
, France
| | - Jeremy M. Smith
- Department of Chemistry
, Indiana University
,
800 E. Kirkwood Ave.
, Bloomington
, IN 47405
, USA
.
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40
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Colmer HE, Margarit CG, Smith JM, Jackson TA, Telser J. Spectroscopic and Computational Investigation of Low-Spin Mn(III) Bis(scorpionate) Complexes. Eur J Inorg Chem 2016; 2016:2413-2423. [PMID: 28713219 PMCID: PMC5507630 DOI: 10.1002/ejic.201501250] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Indexed: 11/06/2022]
Abstract
Six-coordinate MnIII complexes are typically high-spin (S = 2), however, the scorpionate ligand, both in its traditional, hydridotris(pyrazolyl)borate form, Tp- and Tp*- (the latter with 3,5-dimethylpyrazole substituents) and in an aryltris(carbene)borate (i.e., N-heterocyclic carbene, NHC) form, [Ph(MeIm)3B]-, (MeIm = 3-methylimidazole) lead to formation of bis(scorpionate) complexes of MnIII with spin triplet ground states; three of which were investigated herein: [Tp2Mn]SbF6 (1SBF6), [Tp*2Mn]SbF6 (2SBF6), and [{Ph(MeIm)3B}2Mn]CF3SO3 (3CF3SO3). These trigonally symmetric complexes were studied experimentally by magnetic circular dichroism (MCD) spectroscopy (the propensity of 3 to oxidize to MnIV precluded collection of useful MCD data) including variable temperatures and fields (VTVH-MCD) and computationally by ab initio CASSCF/NEVPT2 methods. These combined experimental and theoretical techniques establish the 3A2g electronic ground state for the three complexes, and provide information on the energy of the "conventional" high-spin excited state (5Eg) and other, triplet excited states. These results show the electronic effect of pyrazole ring substituents in comparing 1 and 2. The tunability of the scorpionate ligand, even by perhaps the simplest change (from pyrazole in 1 to 3,5-dimethylpyrazole in 2) is quantitatively manifested through perturbations in ligand-field excited-state energies that impact ground-state zero-field splittings. The comparison with the NHC donor is much more dramatic. In 3, the stronger σ-donor properties of the NHC lead to a quantitatively different electronic structure, so that the lowest lying spin triplet excited state, 3Eg, is much closer in energy to the ground state than in 1 or 2. The zero-field splitting (zfs) parameters of the three complexes were calculated and in the case of 1 and 2 compare closely to experiment (lower by < 10%, < 2 cm-1 in absolute terms); for 3 the large magnitude zfs is reproduced, although there is ambiguity about its sign. The comprehensive picture obtained for these bis(scorpionate) MnIII complexes provides quantitative insight into the role played by the scorpionate ligand in stabilizing unusual electronic structures.
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Affiliation(s)
- Hannah E Colmer
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 USA
| | - Charles G Margarit
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003 USA
| | - Jeremy M Smith
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003 USA
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405 USA
| | - Timothy A Jackson
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 USA
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, Chicago, Illinois 60605 USA
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41
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Santini C, Marinelli M, Pellei M. Boron-Centered Scorpionate-Type NHC-Based Ligands and Their Metal Complexes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600133] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Carlo Santini
- School of Science and Technology; Chemistry Division; University of Camerino; via S. Agostino 1 62032 Camerino Macerata Italy
| | - Marika Marinelli
- School of Science and Technology; Chemistry Division; University of Camerino; via S. Agostino 1 62032 Camerino Macerata Italy
| | - Maura Pellei
- School of Science and Technology; Chemistry Division; University of Camerino; via S. Agostino 1 62032 Camerino Macerata Italy
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42
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Martins LMDRS, Pombeiro AJL. Water-Soluble C-Scorpionate Complexes - Catalytic and Biological Applications. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600053] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Luísa M. D. R. S. Martins
- Chemical Engineering Department; Instituto Superior de Engenharia de Lisboa; R. Conselheiro Emídio Navarro 1959-007 Lisboa Portugal
- Centro de Química Estrutural; Instituto Superior Técnico; Universidade de Lisboa; Av. Rovisco Pais 1049-001 Lisboa Portugal
| | - Armando J. L. Pombeiro
- Centro de Química Estrutural; Instituto Superior Técnico; Universidade de Lisboa; Av. Rovisco Pais 1049-001 Lisboa Portugal
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43
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Pawar GM, Sheridan JB, Jäkle F. Pyridylborates as a New Type of Robust Scorpionate Ligand: From Metal Complexes to Polymeric Materials. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501373] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gajanan M. Pawar
- Department of Chemistry; Rutgers University Newark; 73 Warren Street 07102 Newark New Jersey United States
| | - John B. Sheridan
- Department of Chemistry; Rutgers University Newark; 73 Warren Street 07102 Newark New Jersey United States
| | - Frieder Jäkle
- Department of Chemistry; Rutgers University Newark; 73 Warren Street 07102 Newark New Jersey United States
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44
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Hickey AK, Chen CH, Pink M, Smith JM. Low-Valent Iron Carbonyl Complexes with a Tripodal Carbene Ligand. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00646] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anne K. Hickey
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Chun-Hsing Chen
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Maren Pink
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Jeremy M. Smith
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
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45
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Kreider-Mueller A, Quinlivan PJ, Rong Y, Owen JS, Parkin G. Exchange of Alkyl and Tris(2-mercapto-1- t-butylimidazolyl)hydroborato Ligands Between Zinc, Cadmium and Mercury. J Organomet Chem 2015; 792:177-183. [PMID: 26273109 DOI: 10.1016/j.jorganchem.2015.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The tris(2-mercaptoimidazolyl)hydroborato ligand, [TmBut ], has been used to investigate the exchange of alkyl and sulfur donor ligands between the Group 12 metals, Zn, Cd and Hg. For example, [TmBut ]2Zn reacts with Me2Zn to yield [TmBut ]ZnMe, while [TmBut ]CdMe is obtained readily upon reaction of [TmBut ]2Cd with Me2Cd. Ligand exchange is also observed between different metal centers. For example, [TmBut ]CdMe reacts with Me2Zn to afford [TmBut ]ZnMe and Me2Cd. Likewise, [TmBut ]HgMe reacts with Me2Zn to afford [TmBut ]ZnMe and Me2Hg. However, whereas the [TmBut ] ligand transfers from mercury to zinc in the methyl system, [TmBut ]HgMe/Me2Zn, transfer of the [TmBut ] ligand from zinc to mercury is observed upon treatment of [TmBut ]2Zn with HgI2 to afford [TmBut ]HgI and [TmBut ]ZnI. These observations demonstrate that the phenomenological preference for the [TmBut ] ligand to bind one metal rather than another is strongly influenced by the nature of the co-ligands.
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Affiliation(s)
| | | | - Yi Rong
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Jonathan S Owen
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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46
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García-Rodríguez R, Wright DS. Steric Effects on the Structures, Reactivity, and Coordination Chemistry of Tris(2-pyridyl)aluminates. Chemistry 2015; 21:14949-57. [DOI: 10.1002/chem.201502156] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 07/06/2015] [Indexed: 11/09/2022]
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47
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Kreider-Mueller A, Quinlivan PJ, Owen JS, Parkin G. Synthesis and structures of cadmium carboxylate and thiocarboxylate compounds with a sulfur-rich coordination environment: carboxylate exchange kinetics involving tris(2-mercapto-1-t-butylimidazolyl)hydroborato cadmium complexes, [Tm(Bu(t))]Cd(O2CR). Inorg Chem 2015; 54:3835-50. [PMID: 25826184 PMCID: PMC4415050 DOI: 10.1021/acs.inorgchem.5b00017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Indexed: 11/28/2022]
Abstract
A series of cadmium carboxylate compounds in a sulfur-rich environment provided by the tris(2-tert-butylmercaptoimidazolyl)hydroborato ligand, namely, [Tm(Bu(t))]CdO2CR, has been synthesized via the reactions of the cadmium methyl derivative [Tm(Bu(t))]CdMe with RCO2H. Such compounds mimic aspects of cadmium-substituted zinc enzymes and also the surface atoms of cadmium chalcogenide crystals, and have therefore been employed to model relevant ligand exchange processes. Significantly, both (1)H and (19)F NMR spectroscopy demonstrate that the exchange of carboxylate groups between [Tm(Bu(t))]Cd(κ(2)-O2CR) and the carboxylic acid RCO2H is facile on the NMR time scale, even at low temperature. Analysis of the rate of exchange as a function of concentration of RCO2H indicates that reaction occurs via an associative rather than dissociative pathway. In addition to carboxylate compounds, the thiocarboxylate derivative [Tm(Bu(t))]Cd[κ(1)-SC(O)Ph] has also been synthesized via the reaction of [Tm(Bu(t))]CdMe with thiobenzoic acid. The molecular structure of [Tm(Bu(t))]Cd[κ(1)-SC(O)Ph] has been determined by X-ray diffraction, and an interesting feature is that, in contrast to the carboxylate derivatives [Tm(Bu(t))]Cd(κ(2)-O2CR), the thiocarboxylate ligand binds in a κ(1) manner via only the sulfur atom.
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Affiliation(s)
- Ava Kreider-Mueller
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
| | - Patrick J. Quinlivan
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
| | - Jonathan S. Owen
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
| | - Gerard Parkin
- Department of Chemistry, Columbia
University, New York, New York 10027, United
States
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48
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Fischer PJ, Weberg AB, Bohrmann TD, Xu H, Young VG. Group VI metal complexes of tris(diphenylphosphinomethyl)phenylborate: modulation of ligand donation via coordination of M(CO)3 units at the borate phenyl substituent. Dalton Trans 2015; 44:3737-44. [PMID: 25604963 DOI: 10.1039/c4dt03857f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A series of d(6) metal complexes of tris(diphenylphosphinomethyl)phenylborate ([PhB(CH2PPh2)3](-), PhBP3), including [Et4N][M(CO)3(PhBP3)] (M = Cr, Mo, W), inaugural group VI metal tris(phosphino)borate complexes, and zwitterionic Mn(CO)3(PhBP3) have been synthesized and fully characterized. An analysis of IR ν(CO) data for [Et4N][M(CO)3(PhBP3)] indicates that PhBP3 is significantly less strongly donating than Tp towards zerovalent M(CO)3 fragments; PhBP3 does not function as a strongly donating scorpionate in this system as its does towards cationic metal fragments suggesting that PhBP3 may not function as an effective surrogate of hydrotris(1-pyrazolyl)borate towards zerovalent metals. While the metal centers of [Et4N][M(CO)3(PhBP3)] are very likely still more electron-rich than those of M(CO)3(triphos), the anions of [Et4N][M(CO)3(PhBP3)] do not provide robust oxidative addition products analogous to those of M(CO)3(triphos). A new bi-functional role for PhBP3 was investigated via the synthesis of seven structurally characterized bimetallics in which zerovalent M(CO)3 and monovalent [Mn(CO)3](+) fragments bind the three phosphine atoms and the borate phenyl substituent. IR ν(CO) data support modest attenuation of PhBP3 donor ability at phosphorus upon η(6)-phenyl substituent binding, representing a new inductive strategy for tuning tris(phosphino)phenylborate donation at the κ(3)-phosphine-bound metal fragment.
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Affiliation(s)
- Paul J Fischer
- Department of Chemistry, Macalester College, 1600 Grand Avenue, Saint Paul, Minnesota 55105, USA.
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Palmer JH, Parkin G. Influence of Benzannulation on Metal Coordination Geometries: Synthesis and Structural Characterization of Tris(2-mercapto-1-methylbenzimidazolyl)hydroborato Cadmium Bromide, {[Tm MeBenz]Cd(μ-Br)} 2.. J Mol Struct 2015; 1081:530-535. [PMID: 25601793 PMCID: PMC4296741 DOI: 10.1016/j.molstruc.2014.10.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The tris(2-mercapto-1-methylbenzimidazolyl)hydroborato cadmium complex, {[TmMeBenz]Cd(μ-Br)}2, may be synthesized via the reaction of [TmMeBenz]K with CdBr2. X-ray diffraction demonstrates that {[TmMeBenz]Cd(μ-Br)}2 exists as a dimer, which is in marked contrast to the monomeric structure of the non-benzannulated counterpart, [TmMe]CdBr, and thereby demonstrates that benzannulation of tris(2-mercapto-1-methylbenzimidazolyl)hydroborato ligands can have a distinct impact on the molecular structure of their metal complexes. In accord with this observation, density functional theory calculations indicate that the benzannulated dimers, {[TmMeBenz]Cd(μ-X)}2 (X = Cl, Br, I), are more stable with respect to dissociation than are their non-benzannulated counterparts, {[TmMe]Cd(μ-X)}2. Furthermore, the calculations also indicate that the stability of the dimer depends on the nature of X, such that the dimer becomes more stable in the sequence I < Br < Cl.
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Affiliation(s)
- Joshua H Palmer
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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Müller C, Koch A, Görls H, Krieck S, Westerhausen M. Tris(pyrazolyl)methanides of the Alkaline Earth Metals: Influence of the Substitution Pattern on Stability and Degradation. Inorg Chem 2015; 54:635-45. [DOI: 10.1021/ic5025907] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christoph Müller
- Institute of Inorganic and
Analytical Chemistry (IAAC), Friedrich Schiller University Jena, Humboldtstrasse
8, 07743 Jena, Germany
| | - Alexander Koch
- Institute of Inorganic and
Analytical Chemistry (IAAC), Friedrich Schiller University Jena, Humboldtstrasse
8, 07743 Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and
Analytical Chemistry (IAAC), Friedrich Schiller University Jena, Humboldtstrasse
8, 07743 Jena, Germany
| | - Sven Krieck
- Institute of Inorganic and
Analytical Chemistry (IAAC), Friedrich Schiller University Jena, Humboldtstrasse
8, 07743 Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and
Analytical Chemistry (IAAC), Friedrich Schiller University Jena, Humboldtstrasse
8, 07743 Jena, Germany
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