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Seikh L, Dhara S, Shukla A, Singh A, Lahiri GK. Fine Tuning between Radical versus Nonradical States of Azoheteroarenes on Selective Osmium Platforms. Inorg Chem 2024; 63:12175-12189. [PMID: 38870544 DOI: 10.1021/acs.inorgchem.4c01384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
The article highlights the cooperative impact of azoheteroarenes [abbt: 2,2'-azobis(benzothiazole), L1-L3; bmpd: (E)-1,2-bis(1-methyl-1H-pyrazole-3-yl) diazene, L4] and coligands [bpy: 2,2'-bipyridine; pap: 2-phenylazopyridine] in tuning radical (N-N•-) versus nonradical (N═N0) states of L on selective OsII-platforms in structurally/spectroscopically characterized monomeric [1]ClO4-[6]ClO4 and [1](ClO4)2-[2](ClO4)2/[7](ClO4)2-[8](ClO4)2, respectively. The preferred syn-configuration of L in the complexes prevented obtaining ligand bridged dimeric species. It revealed that {Os(bpy)2} facilitated the stabilization of both nonradical ([1](ClO4)2-[2](ClO4)2) and radical ([1]ClO4-[2]ClO4) states of L1/L2, while it delivered exclusively the radical form for L3 in [3]ClO4. In contrast, {Os(pap)2} generated radical states of L1-L3 in [4]ClO4-[6]ClO4, respectively, without any alteration of the redox state of OsII and azo (N═N0) function of the pap coligand. The neutral state of L4 was, however, ascertained in [7](ClO4)2 or [8](ClO4)2 irrespective of the nature of the metal fragment {Os(bpy)2} or {Os(pap)2}, respectively. Switching between radical and nonradical forms of L in the complexes as a function L and coligand could be addressed based on their relative FMO (frontier molecular orbital) energies. Multiple close redox steps of the complexes extended a competitive electron transfer scenario between the redox active components including metal/L/bpy/pap, leading to delicate electronic forms in each case.
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Affiliation(s)
- Liton Seikh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Suman Dhara
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Anuj Shukla
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Aditi Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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2
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Landaeta VR, Horsley Downie TM, Wolf R. Low-Valent Transition Metalate Anions in Synthesis, Small Molecule Activation, and Catalysis. Chem Rev 2024; 124:1323-1463. [PMID: 38354371 PMCID: PMC10906008 DOI: 10.1021/acs.chemrev.3c00121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 10/09/2023] [Accepted: 10/09/2023] [Indexed: 02/16/2024]
Abstract
This review surveys the synthesis and reactivity of low-oxidation state metalate anions of the d-block elements, with an emphasis on contributions reported between 2006 and 2022. Although the field has a long and rich history, the chemistry of transition metalate anions has been greatly enhanced in the last 15 years by the application of advanced concepts in complex synthesis and ligand design. In recent years, the potential of highly reactive metalate complexes in the fields of small molecule activation and homogeneous catalysis has become increasingly evident. Consequently, exciting applications in small molecule activation have been developed, including in catalytic transformations. This article intends to guide the reader through the fascinating world of low-valent transition metalates. The first part of the review describes the synthesis and reactivity of d-block metalates stabilized by an assortment of ligand frameworks, including carbonyls, isocyanides, alkenes and polyarenes, phosphines and phosphorus heterocycles, amides, and redox-active nitrogen-based ligands. Thereby, the reader will be familiarized with the impact of different ligand types on the physical and chemical properties of metalates. In addition, ion-pairing interactions and metal-metal bonding may have a dramatic influence on metalate structures and reactivities. The complex ramifications of these effects are examined in a separate section. The second part of the review is devoted to the reactivity of the metalates toward small inorganic molecules such as H2, N2, CO, CO2, P4 and related species. It is shown that the use of highly electron-rich and reactive metalates in small molecule activation translates into impressive catalytic properties in the hydrogenation of organic molecules and the reduction of N2, CO, and CO2. The results discussed in this review illustrate that the potential of transition metalate anions is increasingly being tapped for challenging catalytic processes with relevance to organic synthesis and energy conversion. Therefore, it is hoped that this review will serve as a useful resource to inspire further developments in this dynamic research field.
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Affiliation(s)
| | | | - Robert Wolf
- University of Regensburg, Institute
of Inorganic Chemistry, 93040 Regensburg, Germany
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3
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Tarifa L, Geer AM, Asensio L, López JA, Ciriano MA, Tejel C. Redox-Transmetalation Reactions: Easy Access to Homo- and Heterodimetallic d 8,d 10 Complexes. Inorg Chem 2023; 62:19421-19432. [PMID: 37988130 DOI: 10.1021/acs.inorgchem.3c02200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
The ability of the imine PyCH═N-CH2Py (Py = 2-pyridyl, bpi) to behave as a heteroditopic ligand, which is suitable for creating two separate compartments to host metals in different oxidation states, has been developed by studying the reactions of the mixed-valence complexes [(cod)M-Ι(μ-bpi)MΙ(cod)] (M = Rh, Ir) with [M'(Cl)2(PPh3)2] (M' = Pd, Ni). The results depend on the molar ratio of the reagents used (1:1 or 1:2) to give the heterometallic complexes {d10-M',d8-M}-[(PPh3)(Cl)M'0(μ-bpi)MΙ(cod)] (Pd,Rh, 4; Pd,Ir, 5; Ni,Rh, 8; Ni,Ir, 9) and the two-electron mixed-valent compounds [(PPh3)(Cl)M'0(μ-bpi)M'ΙΙ(Cl)] (M' = Ni, 10; Pd, 11), respectively. A redox process occurs in the replacement of the low-valent [(cod)M-I] fragment, whereas the exchange of the [(cod)MI] fragment is redox-neutral. The metal with a d8 configuration in the products exhibits a square-planar geometry coordinated to two (Rh/Ir) or three (Ni/Pd) nitrogen atoms of the bridging bpi ligand. Conversely, the metal with a d10 configuration adopts trigonal-planar geometries, π-bonded to the imine C═N bond. The isolated complexes 4/5 and 10/11, along with the hypothetical heterometallic Pd,Ni compound (12), were studied by DFT methods. Additionally, the T-shaped moiety 'M'ΙΙ(PPh3)(Cl)(η1-CH-N(bpi))', stabilized by a secondary γ-agostic interaction, and the 'M'II(Cl)(κ3N-bpi)' fragment was found to be accessible redoxomers of complexes 10 and 11 by DFT calculations.
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Affiliation(s)
- Luis Tarifa
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ana M Geer
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Laura Asensio
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - José A López
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Miguel A Ciriano
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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4
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Singh A, Dey S, Panda S, Lahiri GK. Radical versus Nonradical States of Azobis(benzothiazole) as a Function of Ancillary Ligands on Selective Ruthenium Platforms. Inorg Chem 2021; 60:18260-18269. [PMID: 34762800 DOI: 10.1021/acs.inorgchem.1c02883] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The paper deals with the electronic impact of ancillary ligands on the varying redox features of azobis(benzothiazole) (abbt) in the newly introduced mononuclear ruthenium complexes [Ru(pap)2(abbt)]n (1n) and [Ru(bpy)2(abbt)]n (2n), where pap = 2-phenylazopyridine and bpy = 2,2'-bipyridine. In this regard, the complexes [RuII(pap)2(abbt•-)]ClO4 ([1]ClO4), [RuII(pap)2(abbt0)](ClO4)2 ([1](ClO4)2), [RuII(bpy)2(abbt0)](ClO4)2 ([2](ClO4)2), and [RuII(bpy)2(abbt•-)]ClO4 ([2]ClO4) were structurally and spectroscopically characterized. Unambiguous assignments of the aforestated radical and nonradical forms of abbt in 1+/2+ and 12+/22+, respectively, were made primarily based on their redox-sensitive azo (N═N) bond distances as well as by their characteristic electron paramagnetic resonance (EPR)/NMR signatures. Although the radical form of abbt•- was isolated as an exclusive product in the case of strongly π-acidic pap-derived 1+, the corresponding moderately π-acidic bpy ancillary ligand primarily delivered an oxidized form of abbt0 in 22+, along with the radical form in 2+ as a minor (<10%) component. The oxidized abbt0-derived [1](ClO4)2 was, however, obtained via the chemical oxidation of [1]ClO4. Both 1+ and 22+ displayed multiple closed by reversible redox processes (one oxidation O1 and four successive reductions R1-R4) within the potential window of ±2.0 V versus saturated calomel electrode. The involvement of metal-, ligand-, or metal/ligand-based frontier molecular orbitals along the redox chain was assigned based on the combined experimental (structure, EPR, and spectroelectrochemisry) and theoretical [density functional theory (DFT): molecular orbitals, Mulliken spin densities/time-dependent DFT] investigations. It revealed primarily ligand (abbt/pap or bpy)-based redox activities, keeping the metal ion as a simple spectator. Moreover, frontier molecular orbital analysis corroborated the initial isolation of the radical and nonradical species for the pap-derived 1+ and bpy-derived 22+ as well as facile reduction of pap and abbt in 1+ and 2+, respectively.
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Affiliation(s)
- Aditi Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sanchaita Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sanjib Panda
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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5
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Ortega-Lepe I, Rossin A, Sánchez P, Santos LL, Rendón N, Álvarez E, López-Serrano J, Suárez A. Ammonia-Borane Dehydrogenation Catalyzed by Dual-Mode Proton-Responsive Ir-CNN H Complexes. Inorg Chem 2021; 60:18490-18502. [PMID: 34784204 PMCID: PMC8653221 DOI: 10.1021/acs.inorgchem.1c03056] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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Metal complexes incorporating
proton-responsive ligands have been
proved to be superior catalysts in reactions involving the H2 molecule. In this contribution, a series of IrIII complexes
based on lutidine-derived CNNH pincers containing N-heterocyclic
carbene and secondary amino NHR [R = Ph (4a), tBu (4b), benzyl (4c)] donors
as flanking groups have been synthesized and tested in the dehydrogenation
of ammonia–borane (NH3BH3, AB) in the
presence of substoichiometric amounts (2.5 equiv) of tBuOK. These preactivated derivatives are efficient catalysts in AB
dehydrogenation in THF at room temperature, albeit significantly different
reaction rates were observed. Thus, by using 0.4 mol % of 4a, 1.0 equiv of H2 per mole of AB was released
in 8.5 min (turnover frequency (TOF50%) = 1875 h–1), while complexes 4b and 4c (0.8 mol %)
exhibited lower catalytic activities (TOF50% = 55–60
h–1). 4a is currently the best performing
IrIII homogeneous catalyst for AB dehydrogenation. Kinetic
rate measurements show a zero-order dependence with respect to AB,
and first order with the catalyst in the dehydrogenation with 4a (−d[AB]/dt = k[4a]). Conversely, the reaction with 4b is second order in AB and first order in the catalyst (−d[AB]/dt = k[4b][AB]2).
Moreover, the reactions of the derivatives 4a and 4b with an excess of tBuOK (2.5 equiv) have
been analyzed through NMR spectroscopy. For the former precursor,
formation of the iridate 5 was observed as a result of
a double deprotonation at the amine and the NHC pincer arm. In marked
contrast, in the case of 4b, a monodeprotonated (at the
pincer NHC-arm) species 6 is observed upon reaction with tBuOK. Complex 6 is capable of activating H2 reversibly to yield the trihydride derivative 7. Finally, DFT calculations of the first AB dehydrogenation step
catalyzed by 5 has been performed at the DFT//MN15 level
of theory in order to get information on the predominant metal–ligand
cooperation mode. Iridium complexes
based on CNNH ligands containing
two potential proton-responsive sites—a lutidine scaffold and
a secondary amino group—have been tested in the dehydrogenation
of ammonia-borane. Upon reaction with base, depending on the amino
group acidity, mono- or doubly deprotonated species exhibiting significantly
different catalytic activities were observed.
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Affiliation(s)
- Isabel Ortega-Lepe
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA). CSIC and Universidad de Sevilla. Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Andrea Rossin
- Istituto di Chimica dei Composti Organometallici - Consiglio Nazionale delle Ricerche (ICCOM - CNR). Via Madonna del Piano 10, 50019, Sesto Fiorentino Italy
| | - Práxedes Sánchez
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA). CSIC and Universidad de Sevilla. Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Laura L Santos
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA). CSIC and Universidad de Sevilla. Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Nuria Rendón
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA). CSIC and Universidad de Sevilla. Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA). CSIC and Universidad de Sevilla. Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Joaquín López-Serrano
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA). CSIC and Universidad de Sevilla. Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Andrés Suárez
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA). CSIC and Universidad de Sevilla. Avda. Américo Vespucio 49, 41092 Sevilla, Spain
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6
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Sousa SF, Ertem MZ, Faustino LA, Machado AEH, Concepcion JJ, Maia PIS, Patrocinio AOT. Mechanistic investigation of the aerobic oxidation of 2-pyridylacetate coordinated to a Ru(II) polypyridyl complex. Dalton Trans 2021; 50:15248-15259. [PMID: 34632989 DOI: 10.1039/d1dt02461b] [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
A new ruthenium polypyridyl complex, [Ru(bpy)2(acpy)]+ (acpy = 2-pyridylacetate, bpy = 2,2'-bipyridine), was synthesized and fully characterized. Distinct from the previously reported analog, [Ru(bpy)2(pic)]+ (pic = 2-pyridylcarboxylate), the new complex is unstable under aerobic conditions and undergoes oxidation to yield the corresponding α-keto-2-pyridyl-acetate (acpyoxi) coordinated to the RuII center. The reaction is one of the few examples of C-H activation at mild conditions using O2 as the primary oxidant and can provide mechanistic insights with important implications for catalysis. Theoretical and experimental investigations of this aerobic oxidative transformation indicate that it takes place in two steps, first producing the α-hydroxo-2-pyridyl-acetate analog and then the final product. The observed rate constant for the first oxidation was in the order of 10-2 h-1. The reaction is hindered in the presence of coordinating solvents indicating the role of the metal center in the process. Theoretical calculations at the M06-L level of theory were performed for multiple reaction pathways in order to gain insights into the most probable mechanism. Our results indicate that O2 binding to [Ru(bpy)2(acpy)]+ is favored by the relative instability of the six-ring chelate formed by the acpy ligand and the resulting RuIII-OO˙- superoxo is stabilized by the carboxylate group in the coordination sphere. C-H activation by this species involves high activation free energies (ΔG‡ = 41.1 kcal mol-1), thus the formation of a diruthenium μ-peroxo intermediate, [(RuIII(bpy)2(O-acpy))2O2]2+via interaction of a second [Ru(bpy)2(acpy)]+ was examined as an alternative pathway. The dimer yields two RuIVO centers with a low ΔG‡ of 2.3 kcal mol-1. The resulting RuIVO species can activate C-H bonds in acpy (ΔG‡ = 23.1 kcal mol-1) to produce the coordinated α-hydroxo-2-pyridylacetate. Further oxidation of this intermediate leads to the α-keto-2-pyridyl-acetate product. The findings provide new insights into the mechanism of C-H activation catalyzed by transition-metal complexes using O2 as the sole oxygen source.
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Affiliation(s)
- Sinval F Sousa
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
| | - Mehmed Z Ertem
- Chemistry Division, Energy & Photon Sciences Directorate, Brookhaven National Laboratory, Upton, USA.
| | - Leandro A Faustino
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
| | - Antonio Eduardo H Machado
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
| | - Javier J Concepcion
- Chemistry Division, Energy & Photon Sciences Directorate, Brookhaven National Laboratory, Upton, USA.
| | - Pedro I S Maia
- Núcleo de Desenvolvimento de Compostos Bioativos (NDCBio), Universidade Federal do Triângulo Mineiro, Av. Dr. Randolfo Borges 1400, 38025-440 Uberaba, MG, Brazil
| | - Antonio Otavio T Patrocinio
- Laboratory of Photochemistry and Materials Science, Institute of Chemistry, Universidade Federal de Uberlandia, 38400-902, Uberlandia, Brazil.
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Singh A, Dey S, Panda S, Lahiri GK. Redox Induced Tunable Functionalization of Picolylamines on Selective Ru‐Platform. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Aditi Singh
- Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Sanchaita Dey
- Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Sanjib Panda
- Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
| | - Goutam Kumar Lahiri
- Department of Chemistry Indian Institute of Technology Bombay, Powai Mumbai 400076 India
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8
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Li M, Hsu YP, Liu YH, Peng SM, Liu ST. Iridium complexes with ligands of 1,8-Naphthyridine-2-carboxylic acid derivatives-preparation and catalysis. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Panda S, Goel P, Lahiri GK. Non-Spectator Feature of α-Diimine Mimicked Di/tetrahydro-bisisoquinoline and Biimidazopyridine on {Ru(acac)2
} Platform. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000230] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Sanjib Panda
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Mumbai Powai India
| | - Puneet Goel
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Mumbai Powai India
| | - Goutam Kumar Lahiri
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Mumbai Powai India
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10
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Panda S, Singha Hazari A, Gogia M, Lahiri GK. Diverse Functionalization of Ruthenium-Chelated 2-Picolylamines: Oxygenation, Dehydrogenation, Cyclization, and N-Dealkylation. Inorg Chem 2020; 59:1355-1363. [DOI: 10.1021/acs.inorgchem.9b03065] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sanjib Panda
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Arijit Singha Hazari
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Manish Gogia
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
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11
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Zhou C, Munkerup K, Wang Y, Das PK, Chakraborty P, Hu J, Yao C, Huang MH, Huang KW. Ligand-centered reactivity of a pseudo-dearomatized phosphorus-nitrogen PN 3P* rhodium complex towards molecular oxygen at room temperature. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01605h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The pseudo-dearomatized ligand of PN3P*Rh-CO reacts with O2 to form an α, β-unsaturated carbonyl moiety at room temperature, showcasing an unprecedented ligand-centered reactivity with the oxidation state of Rh(I) remaining untouched.
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Affiliation(s)
- Chunhui Zhou
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Kristin Munkerup
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Yuan Wang
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Pradip K. Das
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Priyanka Chakraborty
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Jinsong Hu
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Changguang Yao
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Mei-Hui Huang
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
| | - Kuo-Wei Huang
- KAUST Catalysis Center & Division of Physical Science and Engineering
- King Abdullah University of Science and Technology
- Thuwal 23900-6900
- Saudi Arabia
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12
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Abril P, Del Río MP, López JA, Lledós A, Ciriano MA, Tejel C. Inner-Sphere Oxygen Activation Promoting Outer-Sphere Nucleophilic Attack on Olefins. Chemistry 2019; 25:14546-14554. [PMID: 31432579 DOI: 10.1002/chem.201903068] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/19/2019] [Indexed: 01/18/2023]
Abstract
Alkoxylation and hydroxylation reactions of 1,5-cyclooctadiene (cod) in an iridium complex with alcohols and water promoted by the reduction of oxygen to hydrogen peroxide are described. The exo configuration of the OH/OR groups in the products agrees with nucleophilic attack at the external face of the olefin as the key step. The reactions also require the presence of a coordinating protic acid (such as picolinic acid (Hpic)) and involve the participation of a cationic diolefin iridium(III) complex, [Ir(cod)(pic)2 ]+ , which has been isolated. Independently, this cation is also involved in easy alkoxy group exchange reactions, which are very unusual for organic ethers. DFT studies on the mechanism of olefin alkoxylation mediated by oxygen show a low-energy proton-coupled electron-transfer step connecting a superoxide-iridium(II) complex with hydroperoxide-iridium(III) intermediates, rather than peroxide complexes. Accordingly, a more complex reaction, with up to four different products, occurred upon reacting the diolefin-peroxide iridium(III) complex with Hpic. Moreover, such hydroperoxide intermediates are the origin of the regio- and stereoselectivity of the hydroxylation/alkoxylation reactions. If this protocol is applied to the diolefin-rhodium(I) complex [Rh(pic)(cod)], free alkyl ethers ORC8 H11 (R=Me, Et) resulted, and the reaction is enantioselective if a chiral amino acid, such as l-proline, is used instead of Hpic.
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Affiliation(s)
- Paula Abril
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - M Pilar Del Río
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - José A López
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - Agustí Lledós
- Departament de Química, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193, Barcelona, Spain
| | - Miguel A Ciriano
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain
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13
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Heuermann I, Heitmann B, Stichauer R, Duvinage D, Vogt M. Rh(I) Complex with a Tridentate Pyridine–Amino–Olefin Actor Ligand–Metal–Ligand Cooperative Activation of CO2 and Phenylisocyanate under C–C and Rh–E (E = O, N) Bond Formation. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00094] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Isabell Heuermann
- FB 2 Biologie/Chemie, Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Str. 7, NW2 C2060, 28359 Bremen, Germany
| | - Benjamin Heitmann
- FB 2 Biologie/Chemie, Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Str. 7, NW2 C2060, 28359 Bremen, Germany
| | - Rasmus Stichauer
- FB 2 Biologie/Chemie, Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Str. 7, NW2 C2060, 28359 Bremen, Germany
| | - Daniel Duvinage
- FB 2 Biologie/Chemie, Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Str. 7, NW2 C2060, 28359 Bremen, Germany
| | - Matthias Vogt
- FB 2 Biologie/Chemie, Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Str. 7, NW2 C2060, 28359 Bremen, Germany
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14
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Schmidt BM, Ho HA, Basemann K, Ellern A, Windus TL, Sadow AD. Redox Chemistry of Bis(oxazolinyl)cyclopentadienyl and -fluorenyl Rhodium and Iridium Organometallic Compounds. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00626] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bradley M. Schmidt
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Hung-An Ho
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Kevin Basemann
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Arkady Ellern
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Theresa L. Windus
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of Chemistry, Iowa State University, 1605 Gilman
Hall, 2415 Osborn Drive, Ames, Iowa 50011, United States
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15
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Hazra S, Pilania P, Deb M, Kushawaha AK, Elias AJ. Aerobic Oxidation of Primary Amines to Imines in Water using a Cobalt Complex as Recyclable Catalyst under Mild Conditions. Chemistry 2018; 24:15766-15771. [DOI: 10.1002/chem.201803251] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 08/14/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Susanta Hazra
- Department of Chemistry; Indian Institute of Technology, Delhi; Hauz Khas New Delhi- 110016 India
| | - Priti Pilania
- Department of Chemistry; Indian Institute of Technology, Delhi; Hauz Khas New Delhi- 110016 India
| | - Mayukh Deb
- Department of Chemistry; Indian Institute of Technology, Delhi; Hauz Khas New Delhi- 110016 India
| | - Ajay Kishor Kushawaha
- Department of Chemistry; Indian Institute of Technology, Delhi; Hauz Khas New Delhi- 110016 India
| | - Anil J. Elias
- Department of Chemistry; Indian Institute of Technology, Delhi; Hauz Khas New Delhi- 110016 India
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16
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Roy S, Pramanik S, Ghorui T, Dinda S, Patra SC, Pramanik K. Redox-active diaminoazobenzene complexes of rhodium(iii): synthesis, structure and spectroscopic characterization. NEW J CHEM 2018. [DOI: 10.1039/c7nj04790h] [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
Coordination diversity of an aromatic diamine with Rh(iii) is presented together with the elucidation of the molecular and electronic structures, electron transfer, and electronic transitions.
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Affiliation(s)
- Sima Roy
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata – 700032
- India
| | - Shuvam Pramanik
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata – 700032
- India
| | - Tapas Ghorui
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata – 700032
- India
| | - Soumitra Dinda
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata – 700032
- India
| | - Sarat Chandra Patra
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata – 700032
- India
| | - Kausikisankar Pramanik
- Department of Chemistry
- Inorganic Chemistry Section
- Jadavpur University
- Kolkata – 700032
- India
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17
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Influence of a diimine ligand and an activator on the processes taking place in Brookhart-type nickel catalytic systems. RESEARCH ON CHEMICAL INTERMEDIATES 2017. [DOI: 10.1007/s11164-017-3207-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Prince BM, Cundari TR. Computational Study of Methane C–H Activation by Earth-Abundant Metal Amide/Aminyl Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00600] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruce M. Prince
- Center
for Catalysis Computational Research (3CR), Department of Chemistry, Texas Southern University, 3100 Cleburne Street, Houston, Texas 77004, United States
| | - Thomas R. Cundari
- Department
of Chemistry, CASCaM, University of North Texas, 1155 Union Circle,
#305070, Denton, Texas 76203-5017, United States
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19
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Truong PT, Gale EM, Dzul SP, Stemmler TL, Harrop TC. Steric Enforcement about One Thiolate Donor Leads to New Oxidation Chemistry in a NiSOD Model Complex. Inorg Chem 2017; 56:7761-7780. [PMID: 28459242 DOI: 10.1021/acs.inorgchem.7b00485] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ni-containing superoxide dismutase (NiSOD) represents an unusual member of the SOD family due to the presence of oxygen-sensitive Ni-SCys bonds at its active site. Reported in this account is the synthesis and properties of the NiII complex of the N3S2 ligand [N3S2Me2]3- ([N3S2Me2]3- = deprotonated form of 2-((2-mercapto-2-methylpropyl)(pyridin-2-ylmethyl)amino)-N-(2-mercaptoethyl)acetamide), namely Na[Ni(N3S2Me2)] (2), as a NiSOD model that features sterically robust gem-(CH3)2 groups on the thiolate α-C positioned trans to the carboxamide. The crystal structure of 2, coupled with spectroscopic measurements from 1H NMR, X-ray absorption, IR, UV-vis, and mass spectrometry (MS), reveal a planar NiII (S = 0) ion coordinated by only the N2S2 basal donors of the N3S2 ligand. While the structure and spectroscopic properties of 2 resemble those of NiSODred and other models, the asymmetric S ligands open up new reaction paths upon chemical oxidation. One unusual oxidation product is the planar NiII-N3S complex [Ni(Lox)] (5; Lox = 2-(5,5-dimethyl-2-(pyridin-2-yl)thiazolidin-3-yl)-N-(2-mercaptoethyl)acetamide), where two-electron oxidation takes place at the substituted thiolate and py-CH2 carbon to generate a thiazolidine heterocycle. Electrochemical measurements of 2 reveal irreversible events wholly consistent with thiolate redox, which were identified by comparison to the ZnII complex Na[Zn(N3S2Me2)] (3). Although no reaction is observed between 2 and azide, reaction of 2 with superoxide produces multiple products on the basis of UV-vis and MS data, one of which is 5. Density functional theory (DFT) computations suggest that the HOMO in 2 is π* with primary contributions from Ni-dπ/S-pπ orbitals. These contributions can be modulated and biased toward Ni when electron-withdrawing groups are placed on the thiolate α-C. Analysis of the oxidized five-coordinate species 2ox* by DFT reveal a singly occupied spin-up (α) MO that is largely thiolate based, which supports the proposed NiIII-thiolate/NiII-thiyl radical intermediates that ultimately yield 5 and other products.
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Affiliation(s)
- Phan T Truong
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , 140 Cedar Street, Athens, Georgia 30602, United States
| | - Eric M Gale
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , 140 Cedar Street, Athens, Georgia 30602, United States
| | - Stephen P Dzul
- Departments of Pharmaceutical Sciences, Biochemistry and Molecular Biology, Wayne State University , Detroit, Michigan 48201, United States
| | - Timothy L Stemmler
- Departments of Pharmaceutical Sciences, Biochemistry and Molecular Biology, Wayne State University , Detroit, Michigan 48201, United States
| | - Todd C Harrop
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia , 140 Cedar Street, Athens, Georgia 30602, United States
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20
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Rahimi N, de Bruin B, Budzelaar PHM. Balance between Metal and Ligand Reduction in Diiminepyridine Complexes of Ti. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00239] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Naser Rahimi
- Department
of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
| | - Bas de Bruin
- Van
’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Peter H. M. Budzelaar
- Department
of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, Manitoba R3T 2N2, Canada
- Department
of Chemical Sciences, Federico II University of Naples, Via Cintia, Complesso di Monte S. Angelo, 80126 Napoli, Italy
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21
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Vilella-Arribas L, García-Melchor M, Balcells D, Lledós A, López JA, Sancho S, Villarroya BE, del Río MP, Ciriano MA, Tejel C. Rhodium Complexes Promoting C−O Bond Formation in Reactions with Oxygen: The Role of Superoxo Species. Chemistry 2017; 23:5232-5243. [DOI: 10.1002/chem.201605959] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Laia Vilella-Arribas
- Departament de Química; Universitat Autònoma de Barcelona; Cerdanyola del Vallès 08193 Barcelona Spain
| | - Max García-Melchor
- School of Chemistry; Trinity College Dublin; College Green Dublin 2 Ireland
| | - David Balcells
- Centre for Theoretical and Computational Chemistry (CTCC) and Department of Chemistry; University of Oslo; P.O. Box 1033, Blindern 0315 Oslo Norway
| | - Agustí Lledós
- Departament de Química; Universitat Autònoma de Barcelona; Cerdanyola del Vallès 08193 Barcelona Spain
| | - José A. López
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálsis Homogénea (ISQCH); CSIC Universidad de Zaragoza; Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Sofía Sancho
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálsis Homogénea (ISQCH); CSIC Universidad de Zaragoza; Pedro Cerbuna 12 50009 Zaragoza Spain
| | - B. Eva Villarroya
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálsis Homogénea (ISQCH); CSIC Universidad de Zaragoza; Pedro Cerbuna 12 50009 Zaragoza Spain
| | - M. Pilar del Río
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálsis Homogénea (ISQCH); CSIC Universidad de Zaragoza; Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Miguel A. Ciriano
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálsis Homogénea (ISQCH); CSIC Universidad de Zaragoza; Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálsis Homogénea (ISQCH); CSIC Universidad de Zaragoza; Pedro Cerbuna 12 50009 Zaragoza Spain
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22
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Nicasio-Collazo J, Wrobel K, Wrobel K, Serrano O. C sp2–Br bond activation of Br-pyridine by neophylpalladacycle: formation of binuclear seven-membered palladacycle and bipyridine species. NEW J CHEM 2017. [DOI: 10.1039/c7nj02468a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A small library of seven-membered palladacycles and asymmetric bipyridines was prepared via C–Br activation and C–C coupling reactions.
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Affiliation(s)
| | - Katarzyna Wrobel
- Universidad de Guanajuato
- Departamento de Química
- Guanajuato, Gto
- Mexico
| | - Kazimierz Wrobel
- Universidad de Guanajuato
- Departamento de Química
- Guanajuato, Gto
- Mexico
| | - Oracio Serrano
- Universidad de Guanajuato
- Departamento de Química
- Guanajuato, Gto
- Mexico
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23
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Jacquet J, Desage-El Murr M, Fensterbank L. Metal-Promoted Coupling Reactions Implying Ligand-Based Redox Changes. ChemCatChem 2016. [DOI: 10.1002/cctc.201600616] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jérémy Jacquet
- Sorbonne Universités, UPMC, Université Paris 06,UMR CNRS 8232, Institut Parisien de Chimie Moléculaire; France
| | - Marine Desage-El Murr
- Sorbonne Universités, UPMC, Université Paris 06,UMR CNRS 8232, Institut Parisien de Chimie Moléculaire; France
| | - Louis Fensterbank
- Sorbonne Universités, UPMC, Université Paris 06,UMR CNRS 8232, Institut Parisien de Chimie Moléculaire; France
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24
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Gurinovich NS, Petrovskii SK, Saraev VV, Salii IV. Study of the nature and mechanism of the formation of paramagnetic species in nickel-based Brookhart-type catalytic systems. KINETICS AND CATALYSIS 2016. [DOI: 10.1134/s0023158416040054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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25
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Sieh D, Kubiak CP. A Series of Diamagnetic Pyridine Monoimine Rhenium Complexes with Different Degrees of Metal-to-Ligand Charge Transfer: Correlating 13
C NMR Chemical Shifts with Bond Lengths in Redox-Active Ligands. Chemistry 2016; 22:10638-50. [DOI: 10.1002/chem.201600679] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Indexed: 12/30/2022]
Affiliation(s)
- Daniel Sieh
- Joint Center for Artificial Photosynthesis; Division of Chemistry and Chemical Engineering; California Institute of Technology; 1200 East California Boulevard Pasadena CA 91125 USA
| | - Clifford P. Kubiak
- Joint Center for Artificial Photosynthesis; Division of Chemistry and Chemical Engineering; California Institute of Technology; 1200 East California Boulevard Pasadena CA 91125 USA
- Department of Chemistry and Biochemistry; University of California, San Diego; 9500 Gilman Drive MC 0358 La Jolla California 92093 USA
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26
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Sikari R, Sinha S, Jash U, Das S, Brandão P, de Bruin B, Paul ND. Deprotonation Induced Ligand Oxidation in a NiII Complex of a Redox Noninnocent N1-(2-Aminophenyl)benzene-1,2-diamine and Its Use in Catalytic Alcohol Oxidation. Inorg Chem 2016; 55:6114-23. [DOI: 10.1021/acs.inorgchem.6b00646] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Rina Sikari
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Suman Sinha
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Upasona Jash
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Siuli Das
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Paula Brandão
- Departamento de Química,
CICECO-Instituto de Materiais de Aveiro,Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - Bas de Bruin
- Homogeneous Catalysis Group, van ’t Hoff Institute for Molecular
Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Nanda D. Paul
- Department
of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
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27
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Tang Z, Tejel C, Martinez de Sarasa Buchaca M, Lutz M, van der Vlugt JI, de Bruin B. Reactivity of Me-pma RhIand IrIComplexes upon Deprotonation and Their Application in Catalytic Carbene Carbonylation Reactions. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501302] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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28
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Baumgarth H, Braun T, Braun B, Laubenstein R, Herrmann R. Synthesis of an Iridium Peroxido Complex and Its Reactivity Towards Brønsted Acids. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500384] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hanna Baumgarth
- Humboldt‐Universität zu Berlin, Department of Chemistry, Brook‐Taylor‐Straße 2, 12489 Berlin, Germany, http://www2.hu‐berlin.de/chemie/braun
| | - Thomas Braun
- Humboldt‐Universität zu Berlin, Department of Chemistry, Brook‐Taylor‐Straße 2, 12489 Berlin, Germany, http://www2.hu‐berlin.de/chemie/braun
| | - Beatrice Braun
- Humboldt‐Universität zu Berlin, Department of Chemistry, Brook‐Taylor‐Straße 2, 12489 Berlin, Germany, http://www2.hu‐berlin.de/chemie/braun
| | - Reik Laubenstein
- Humboldt‐Universität zu Berlin, Department of Chemistry, Brook‐Taylor‐Straße 2, 12489 Berlin, Germany, http://www2.hu‐berlin.de/chemie/braun
| | - Roy Herrmann
- Humboldt‐Universität zu Berlin, Department of Chemistry, Brook‐Taylor‐Straße 2, 12489 Berlin, Germany, http://www2.hu‐berlin.de/chemie/braun
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29
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Petrovskii SK, Saraev VV, Gurinovich NS, Kuznetsova E, Matveev D, Kraikivskii P. Study of the nature of counterion of α-diimine radical-anion complexes found in Brookhart-type catalytic systems. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.12.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Zamorano A, Rendón N, López-Serrano J, Valpuesta JEV, Álvarez E, Carmona E. Dihydrogen Catalysis of the Reversible Formation and Cleavage of CH and NH Bonds of Aminopyridinate Ligands Bound to (η5-C5Me5)IrIII. Chemistry 2014; 21:2576-87. [DOI: 10.1002/chem.201405340] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Indexed: 11/06/2022]
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31
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Prokopchuk DE, Tsui BTH, Lough AJ, Morris RH. Intramolecular C-H/O-H bond cleavage with water and alcohol using a phosphine-free ruthenium carbene NCN pincer complex. Chemistry 2014; 20:16960-8. [PMID: 25266279 DOI: 10.1002/chem.201404819] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Indexed: 12/30/2022]
Abstract
Transition metal complexes that exhibit metal-ligand cooperative reactivity could be suitable candidates for applications in water splitting. Ideally, the ligands around the metal should not contain oxidizable donor atoms, such as phosphines. With this goal in mind, we report new phosphine-free ruthenium NCN pincer complexes with a central N-heterocyclic carbene donor and methylpyridyl N-donors. Reaction with base generates a neutral, dearomatized alkoxo-amido complex, which has been structurally and spectroscopically characterized. The tert-butoxide ligand facilitates regioselective, intramolecular proton transfer through a CH/OH bond cleavage process occurring at room temperature. Kinetic and thermodynamic data have been obtained by VT NMR experiments; DFT calculations support the observed behavior. Isolation and structural characterization of a doubly dearomatized phosphine complex also strongly supports our mechanistic proposal. The alkoxo-amido complex reacts with water to form a dearomatized ruthenium hydroxide complex, a first step towards phosphine-free metal-ligand cooperative water splitting.
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Affiliation(s)
- Demyan E Prokopchuk
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, M5S 3H6 (Canada)
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32
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Deibel N, Hohloch S, Schweinfurth D, Weisser F, Grupp A, Sarkar B. Three-way cooperativity in d8 metal complexes with ligands displaying chemical and redox non-innocence. Chemistry 2014; 20:15178-87. [PMID: 25251147 DOI: 10.1002/chem.201403276] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Indexed: 01/19/2023]
Abstract
Reversible proton- and electron-transfer steps are crucial for various chemical transformations. The electron-reservoir behavior of redox non-innocent ligands and the proton-reservoir behavior of chemically non-innocent ligands can be cooperatively utilized for substrate bond activation. Although site-decoupled proton- and electron-transfer steps are often found in enzymatic systems, generating model metal complexes with these properties remains challenging. To tackle this issue, we present herein complexes [(cod-H)M(μ-L(2-)) M(cod-H)] (M = Pt(II), [1] or Pd(II), [2], cod = 1,5-cyclooctadiene, H2L = 2,5-di-[2,6-(diisopropyl)anilino]-1,4-benzoquinone), in which cod acts as a proton reservoir, and L(2-) as an electron reservoir. Protonation of [2] leads to an unusual tetranuclear complex. However, [1] can be stepwise reversibly protonated with up to two protons on the cod-H ligands, and the protonated forms can be stepwise reversibly reduced with up to two electrons on the L(2-) ligand. The doubly protonated form of [1] is also shown to react with OMe(-) leading to an activation of the cod ligands. The site-decoupled proton and electron reservoir sources work in tandem in a three-way cooperative process that results in the transfer of two electrons and two protons to a substrate leading to its double reduction and protonation. These results will possibly provide new insights into developing catalysts for multiple proton- and electron-transfer reactions by using metal complexes of non-innocent ligands.
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Affiliation(s)
- Naina Deibel
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart (Germany)
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Morris WD, Wolczanski PT, Sutter J, Meyer K, Cundari TR, Lobkovsky EB. Iron and chromium complexes containing tridentate chelates based on nacnac and imino- and methyl-pyridine components: triggering C-X bond formation. Inorg Chem 2014; 53:7467-84. [PMID: 25010819 DOI: 10.1021/ic500807y] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Nacnac-based tridentate ligands containing a pyridyl-methyl and a 2,6-dialkyl-phenylamine (i.e., (2,6-R2-C6H3N═C(Me)CH═C(Me)NH(CH2py); R = Et, {Et(nn)PM}H; R = (i)Pr, {(i)Pr(nn)PM}H) were synthesized by condensation routes. Treatment of M{N(TMS)2}THFn (M = Cr, n = 2; M = Fe, Co, n = 1; TMS = trimethylsilane; THF = tetrahydrofuran) with {(i)Pr(nn)PM}H) afforded {(i)Pr(nn)PM}MN(TMS)2 (1-M(iPr); M = Cr, Fe); {Et(nn)PM}MN(TMS)2 (1-M(Et); M = Fe, Co) was similarly obtained. {R(nn)PM}FeBr (R = (i)Pr, Et; 2-Fe(R)) were prepared from FeBr2 and {R(nn)PM}Li, and alkylated to generate {R(nn)PM}Fe(neo)Pe (R = (i)Pr, Et; 3-Fe(R)). Carbonylation of 3-Fe(R) provided {(i)Pr(nn)PM}Fe(CO(neo)Pe)CO (4-Fe(iPr)), and carbonylations of 1-Fe(R) (R = Et, (i)Pr) and 1-Cr(iPr) induced deamination to afford {R(nn)PI}Fe(CO)2 (R = (i)Pr, 5-Fe(iPr); Et, 5-Fe(Et)), where PI is pyridine-imine, and {κ(2)-N,N-pyrim-pyr}Cr(CO)4 (6-Cr(iPr)), in which the aryl-amide side of the nacnac attacked the incipient PI group. Carbon-carbon bonds were formed at the imine carbon of the {R(nn)PI} ligand. Addition of [{(i)Pr(nn)PI}(2-)](K(+)(THF)x)2 to FeCl3 generated {(i)Pr(nn)CHpy}2Fe2Cl2 (7-Fe(iPr)), and TMSN3 induced the deamination of 1-Fe(Et), but with disproportionation to provide {[Et(nn)CHpy]2}Fe (8-Fe(Et)). Ph2CN2 induced C-C bond formation with 1-Fe(iPr) via its thermal degradation to ultimately afford {(i)Pr(nn)CHpy}2(FeN═CPh2)2 (9-Fe(iPr)). The compounds were examined by X-ray crystallography (1-M(iPr), M = Cr, Fe; 1-Co(Et); 2-Fe(iPr); 4-Fe(iPr); 5-Fe(iPr); 6-Cr(iPr); 7-Fe(iPr); 8-Fe(Et); 9-Fe(iPr)), Mössbauer spectroscopy, and NMR spectroscopy. Structural parameters assessing redox noninnocence are discussed, as are structural and mechanistic consequences of the various electronic environments.
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Affiliation(s)
- Wesley D Morris
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853, United States
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Gloaguen Y, Rebreyend C, Lutz M, Kumar P, Huber M, van der Vlugt JI, Schneider S, de Bruin B. An Isolated Nitridyl Radical-Bridged {Rh(N.)Rh} Complex. Angew Chem Int Ed Engl 2014; 53:6814-8. [DOI: 10.1002/anie.201403445] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Indexed: 11/08/2022]
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Gloaguen Y, Rebreyend C, Lutz M, Kumar P, Huber M, van der Vlugt JI, Schneider S, de Bruin B. An Isolated Nitridyl Radical-Bridged {Rh(N.)Rh} Complex. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403445] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sues PE, Forbes MW, Lough AJ, Morris RH. Ligand-based molecular recognition and dioxygen splitting: an endo epoxide ending. Dalton Trans 2014; 43:4137-45. [PMID: 24458017 DOI: 10.1039/c3dt53495b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The phosphido complex RuCp*(PPh2CH=CHPPh2)(PPh2) (1) was exposed to a number of small molecules and was found to recognize and activate molecular oxygen in an unprecedented fashion: the ruthenium species split O2 in a ligand-based 4-electron reduction to produce an endo epoxide, as well as a phosphinito ligand. Based on XRD data, VT NMR studies, cyclooctene trapping studies, and crossover experiments it was determined that the reaction proceeded through an intramolecular mechanism in which initial oxidation of the phosphido ligand generated an end-on peroxo intermediate. This mechanism was also supported by computational studies and electrochemical experiments. In contrast, an analogue of 1, RuCp*(Ph2P(ortho-C6H4)PPh2)(PPh2) (3), reacted in an intermolecular fashion to generate two phosphinito ligands.
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Affiliation(s)
- Peter E Sues
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.
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Kinauer M, Scheibel MG, Abbenseth J, Heinemann FW, Stollberg P, Würtele C, Schneider S. [IrCl{N(CHCHPtBu2)2}]−: a versatile source of the IrI(PNP) pincer platform. Dalton Trans 2014; 43:4506-13. [PMID: 24399308 DOI: 10.1039/c3dt53304b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The iridium(ii) complex [IrCl{N(CHCHPtBu2)2}] is reduced by KC8 to give the anionic iridium(i) pincer complex [IrCl{N(CHCHPtBu2)2}]− which was isolated and fully characterized upon stabilization of the counter cation with crown ether as [K(15-cr-5)2][IrCl{N(CHCHPtBu2)2}].
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Affiliation(s)
- Markus Kinauer
- Georg-August-Universität
- Institut für Anorganische Chemie
- 37077 Göttingen, Germany
| | - Markus G. Scheibel
- Georg-August-Universität
- Institut für Anorganische Chemie
- 37077 Göttingen, Germany
| | - Josh Abbenseth
- Georg-August-Universität
- Institut für Anorganische Chemie
- 37077 Göttingen, Germany
| | - Frank W. Heinemann
- Department Chemie und Pharmazie
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- 91058 Erlangen, Germany
| | - Peter Stollberg
- Georg-August-Universität
- Institut für Anorganische Chemie
- 37077 Göttingen, Germany
| | - Christian Würtele
- Georg-August-Universität
- Institut für Anorganische Chemie
- 37077 Göttingen, Germany
| | - Sven Schneider
- Georg-August-Universität
- Institut für Anorganische Chemie
- 37077 Göttingen, Germany
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Askevold B, Friedrich A, Buchner MR, Lewall B, Filippou AC, Herdtweck E, Schneider S. Reactivity of iridium(I) PNP amido complexes toward protonation and oxidation. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.04.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Szklarzewicz J, Stadnicka K. Endiol ligand formation from 2-pyridinecarboxaldehyde on a Mo(IV) centre. The X-ray crystal structure and properties of the Mo(IV) binuclear complex. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2012.06.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Schneider S, Meiners J, Askevold B. Cooperative Aliphatic PNP Amido Pincer Ligands – Versatile Building Blocks for Coordination Chemistry and Catalysis. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100880] [Citation(s) in RCA: 235] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sven Schneider
- Department Chemie und Pharmazie, Friedrich‐Alexander‐ Universität Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
| | - Jenni Meiners
- Department Chemie und Pharmazie, Friedrich‐Alexander‐ Universität Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
| | - Bjorn Askevold
- Department Chemie und Pharmazie, Friedrich‐Alexander‐ Universität Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
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Tejel C, Asensio L, Pilar del Río M, de Bruin B, López JA, Ciriano MA. Snapshots of a Reversible Metal-Ligand Two-Electron Transfer Step Involving Compounds Related by Multiple Types of Isomerism. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100868] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Preparation, properties, and reactivity of carbonylrhodium(I) complexes of di(2-pyrazolylaryl)amido-pincer ligands. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2011.08.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Tejel C, Asensio L, del Río MP, de Bruin B, López JA, Ciriano MA. Developing Synthetic Approaches with Non-Innocent Metalloligands: Easy Access to IrI/Pd0 and IrI/Pd0/IrI Cores. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104045] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Tejel C, Asensio L, del Río MP, de Bruin B, López JA, Ciriano MA. Developing Synthetic Approaches with Non-Innocent Metalloligands: Easy Access to IrI/Pd0 and IrI/Pd0/IrI Cores. Angew Chem Int Ed Engl 2011; 50:8839-43. [DOI: 10.1002/anie.201104045] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2011] [Indexed: 11/10/2022]
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Tejel C, del Río MP, Asensio L, van den Bruele FJ, Ciriano MA, Tsichlis i Spithas N, Hetterscheid DGH, de Bruin B. Cooperative Double Deprotonation of Bis(2-picolyl)amine Leading to Unexpected Bimetallic Mixed Valence (M–I, MI) Rhodium and Iridium Complexes. Inorg Chem 2011; 50:7524-34. [DOI: 10.1021/ic200395m] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Cristina Tejel
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - M. Pilar del Río
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Laura Asensio
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Fieke J. van den Bruele
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Miguel A. Ciriano
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Nearchos Tsichlis i Spithas
- Van‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Dennis G. H. Hetterscheid
- Van‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Bas de Bruin
- Van‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
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Dzik WI, Zhang XP, de Bruin B. Redox noninnocence of carbene ligands: carbene radicals in (catalytic) C-C bond formation. Inorg Chem 2011; 50:9896-903. [PMID: 21520926 DOI: 10.1021/ic200043a] [Citation(s) in RCA: 158] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In this Forum contribution, we highlight the radical-type reactivities of one-electron-reduced Fischer-type carbenes. Carbene complexes of group 6 transition metals (Cr, Mo, and W) can be relatively easily reduced by an external reducing agent, leading to one-electron reduction of the carbene ligand moiety. This leads to the formation of "carbene-radical" ligands, showing typical radical-type reactivities. Fischer-type carbene ligands are thus clearly redox-active and can behave as so-called "redox noninnocent ligands". The "redox noninnocence" of Fischer-type carbene ligands is most clearly illustrated at group 9 transition metals in the oxidation state II+ (Co(II), Rh(II), and Ir(II)). In such carbene complexes, the metal effectively reduces the carbene ligand by one electron in an intramolecular redox process. As a result, the thus formed "carbene radicals" undergo a variety of radical-type C-C and C-H bond formations. The redox noninnocence of Fischer-type carbene ligands is not just a chemical curiosity but, in fact, plays an essential role in catalytic cyclopropanation reactions by cobalt(II) porphyrins. This has led to the successful development of new chiral cobalt(II) porphyrins as highly effective catalysts for asymmetric cyclopropanation with unprecedented reactivity and stereocontrol. The redox noninnocence of the carbene intermediates results in the formation of carbene-radical ligands with nucleophilic character, which explains their effectiveness in the cyclopropanation of electron-deficient olefins and their reduced tendency to mediate carbene dimerization. To the best of our knowledge, this represents the first example in which the redox noninnocence of a reacting ligand plays a key role in a catalytic organometallic reaction. This Forum contribution ends with an outlook on further potential applications of one-electron-activated Fischer-type carbenes in new catalytic reactions.
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Affiliation(s)
- Wojciech I Dzik
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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Zhu D, Thapa I, Korobkov I, Gambarotta S, Budzelaar PHM. Redox-active ligands and organic radical chemistry. Inorg Chem 2011; 50:9879-87. [PMID: 21520927 DOI: 10.1021/ic2002145] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Knowledge about bonding in diiminepyridine (L) halide, alkyl, and dinitrogen complexes of the metals iron, cobalt, and nickel is summarized, and two new examples are added to the set: L(1)Ni(Me) and L(1)Ni(N(2)). Reactivity of these types of complexes is discussed in terms of organic radical chemistry. New C-C couplings with L(2)CoAr complexes are described and proposed to involve halide abstraction and radical coupling. Calculations support the high tendency of the diiminepyridine ligand to accept an electron coming from a metal-carbon bond and so facilitate loss of a radical.
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Affiliation(s)
- Di Zhu
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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Dzik WI, Fuente Arruga L, Siegler MA, Spek AL, Reek JNH, de Bruin B. Open-Shell Organometallic [MII(dbcot(bislutidylamine)]2+ Complexes (M = Rh, Ir): Unexpected Base-Assisted Reduction of the Metal Instead of Amine Ligand Deprotonation. Organometallics 2011. [DOI: 10.1021/om101157r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wojciech I. Dzik
- Van ‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Luis Fuente Arruga
- Van ‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Maxime A. Siegler
- Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands
| | - Anthony L. Spek
- Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands
| | - Joost N. H. Reek
- Van ‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Bas de Bruin
- Van ‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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Meier G, Braun T. A Rhodium Peroxido Complex in Mono-, Di-, and Peroxygenation Reactions. Angew Chem Int Ed Engl 2011; 50:3280-4. [DOI: 10.1002/anie.201007315] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2010] [Indexed: 11/08/2022]
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50
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Meier G, Braun T. A Rhodium Peroxido Complex in Mono-, Di-, and Peroxygenation Reactions. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007315] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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