1
|
Suhr S, Walter R, Beerhues J, Albold U, Sarkar B. Rhodium Diamidobenzene Complexes: A Tale of Different Substituents on the Diamidobenzene Ligand. Chem Sci 2022; 13:10532-10545. [PMID: 36277629 PMCID: PMC9473529 DOI: 10.1039/d2sc03227a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 07/15/2022] [Indexed: 11/21/2022] Open
Abstract
Diamidobenzene ligands are a prominent class of redox-active ligands owing to their electron reservoir behaviour, as well as the possibility of tuning the steric and the electronic properties of such ligands through the substituents on the N-atoms of the ligands. In this contribution, we present Rh(iii) complexes with four differently substituted diamidobenzene ligands. By using a combination of crystallography, NMR spectroscopy, electrochemistry, UV-vis-NIR/EPR spectroelectrochemistry, and quantum chemical calculations we show that the substituents on the ligands have a profound influence on the bonding, donor, electrochemical and spectroscopic properties of the Rh complexes. We present, for the first time, design strategies for the isolation of mononuclear Rh(ii) metallates whose redox potentials span across more than 850 mV. These Rh(ii) metallates undergo typical metalloradical reactivity such as activation of O2 and C–Cl bond activations. Additionally, we also show that the substituents on the ligands dictate the one versus two electron nature of the oxidation steps of the Rh complexes. Furthermore, the oxidative reactivity of the metal complexes with a [CH3]+ source leads to the isolation of a unprecedented, homobimetallic, heterovalent complex featuring a novel π-bonded rhodio-o-diiminoquionone. Our results thus reveal several new potentials of the diamidobenzene ligand class in organometallic reactivity and small molecule activation with potential relevance for catalysis. Diamidobenzene ligands are versatile platforms in organometallic Rh-chemistry. They allow the isolation of tunable mononuclear ate-complexes, and the formation of a unprecedented homobimetallic, heterovalent complex.![]()
Collapse
Affiliation(s)
- Simon Suhr
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Robert Walter
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Julia Beerhues
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Uta Albold
- Institut für Chemie und Biochemie, Freie Universität Berlin Fabeckstr. 34-36 14195 Berlin Germany
| | - Biprajit Sarkar
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| |
Collapse
|
2
|
Leconte N, Berthiol F, Philouze C, Thomas F. Copper Complexes of the Tetradentate
N,N′
‐Bis(2‐amino‐3,5‐di‐
tert
‐butylphenyl)‐2,2′‐diaminobiphenyl Ligand. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
3
|
Leconte N, Gentil S, Molton F, Philouze C, Le Goff A, Thomas F. Complexes of the Bis(di‐
tert
‐butyl‐aniline)amine Pincer Ligand: The Case of Copper. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000379] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Solène Gentil
- CEA, CNRS Univ. Grenoble Alpes 38000 Grenoble France
- CEA, CNRS, Laboratoire de Chimie et Biologie des Métaux Univ. Grenoble Alpes 38000 Grenoble France
| | | | | | - Alan Le Goff
- CEA, CNRS Univ. Grenoble Alpes 38000 Grenoble France
| | | |
Collapse
|
4
|
Nasibipour M, Safaei E, Masoumpour MS, Wojtczak A. Ancillary ligand electro-activity effects towards phenyl acetylene homocoupling reaction by a nickel(ii) complex of a non-innocent O-amino phenol ligand: a mechanistic insight. RSC Adv 2020; 10:24176-24189. [PMID: 35516191 PMCID: PMC9055111 DOI: 10.1039/d0ra04362a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 05/27/2020] [Indexed: 11/21/2022] Open
Abstract
A new Ni(ii) complex, was synthesized from the reaction of a non-innocent o-aminophenol ligand, and Ni(OAc)2. The crystal structure of NiIIL2NIS (in which, IS stands for iminosemiquinone radical ligand with cyanide (shown by N in NIS) substituent on phenolate rings) exhibits the square planar environment of Ni(ii). The complex has been crystalized in the monoclinic system and Ni(ii) was surrounded by two oxygen and two nitrogen atoms of two ligands. Variable-temperature magnetic susceptibility measurement for crystalline samples of complex shows the effective magnetic moment per molecule (μeff) of near zero and the diamagnetic nature of the complex (S = 0) which emphasize that strong antiferromagnetic coupling prevailed between the two unpaired electrons of LNIS ligands and Ni(ii) high spin electrons. The complex is EPR silent which confirms the diamagnetic character of the Ni(ii) complex. Electrochemical measurement (CV) indicates the redox-active character of ligand and metal. NiIIL2NIS complex proved to be effective for free metal- or base counterpart homocoupling of phenyl acetylene at room temperature. To the best of our knowledge, this is the first example of using Ni(ii) complex without using any reducing agent due to the promotion ancillary effect of non-innocent o-aminophenol ligand which acts as an “electron reservoir” and can reversibly accept and donate electrons in the catalytic cycle. The theoretical calculation confirms the magnetostructure, electronic spectrum and confirmed the suggested mechanism of phenyl acetylene homocoupling with emphasis on the role of non-innocent ligand electro-activity and the effect of ligand substituent on the efficiency and stability of the complex. A new Ni(ii) complex, was synthesized from the reaction of a non-innocent o-aminophenol ligand, and Ni(OAc)2.![]()
Collapse
Affiliation(s)
- Mina Nasibipour
- Department of Chemistry, College of Sciences, Shiraz University 71454 Shiraz Iran
| | - Elham Safaei
- Department of Chemistry, College of Sciences, Shiraz University 71454 Shiraz Iran
| | | | - Andrzej Wojtczak
- Nicolaus Copernicus University, Faculty of Chemistry 87-100 Torun Poland
| |
Collapse
|
5
|
Ryan AJ, Balasubramani SG, Ziller JW, Furche F, Evans WJ. Formation of the End-on Bound Lanthanide Dinitrogen Complexes [(R2N)3Ln–N═N–Ln(NR2)3]2– from Divalent [(R2N)3Ln]1– Salts (R = SiMe3). J Am Chem Soc 2020; 142:9302-9313. [DOI: 10.1021/jacs.0c01021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Austin J. Ryan
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | | | - Joseph W. Ziller
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Filipp Furche
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - William J. Evans
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| |
Collapse
|
6
|
Kunert R, Philouze C, Jarjayes O, Thomas F. Stable M(II)-Radicals and Nickel(III) Complexes of a Bis(phenol) N-Heterocyclic Carbene Chelated to Group 10 Metal Ions. Inorg Chem 2019; 58:8030-8044. [PMID: 31185559 DOI: 10.1021/acs.inorgchem.9b00784] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The tetradentate ligand based on (1-imidazolium-3,5-di tert-butylphenol) units was prepared and chelated to group 10 metal ions (Ni(II), Pd(II), and Pt(II)), affording complexes 1, 2, and 3, respectively. The X-ray crystal structures of 1-3 show a square planar metal ion coordinated to two N-heterocyclic carbenes and two phenolate moieties. The cyclic voltammetry curves of complexes 1-3 show two reversible oxidation waves in the range 0.11-0.21 V ( E1/21) and 0.55-0.65 V ( E1/22) vs Fc+/Fc, which are assigned to the successive oxidations of the phenolate moieties. One-electron oxidation affords mononuclear ( S = 1/2) systems. Complex 1+·SbF6- was remarkably stable, and its structure was characterized. The coordination sphere is slightly dissymmetric, while the typical patterns of phenoxyl radicals were observed within the ligand framework. Complex 1+ exhibits a rhombic signal at g = 2.087, 2.016, and 1.992, confirming its predominant phenoxyl radical character. The g-values are slightly smaller for 2+ (2.021, 2.008, and 1.983) and larger for 3+ (2.140, 1.999, and 1.885) yet consistent with phenoxyl radical species. The electronic spectra of 1+-3+ display an intervalence charge-transfer (IVCT) transition at 2396, 2600, and 2294 nm, respectively. Its intensity supports the description of cations 1+ and 3+ as mixed-valent (Class II/III) compounds according to the Robin Day classification. Complex 2+ behaves as a mixed-valent class II radical compound. In the presence of pyridine, radical species 1+ is successively converted into stable mono and bis(adducts), which are both Ni(III) complexes. Dications 1+2-3+2 were prepared electrochemically. They are electron paramagnetic resonance (EPR)-silent and do not show IVCT transition in their NIR spectra, consistent with a bis(radical) formulation. The proposed electronic structures are fully supported by density functional theory calculations.
Collapse
Affiliation(s)
- Romain Kunert
- Université Grenoble Alpes , UMR CNRS-5250, Département de Chimie Moléculaire , Grenoble F-38000 , France
| | - Christian Philouze
- Université Grenoble Alpes , UMR CNRS-5250, Département de Chimie Moléculaire , Grenoble F-38000 , France
| | - Olivier Jarjayes
- Université Grenoble Alpes , UMR CNRS-5250, Département de Chimie Moléculaire , Grenoble F-38000 , France
| | - Fabrice Thomas
- Université Grenoble Alpes , UMR CNRS-5250, Département de Chimie Moléculaire , Grenoble F-38000 , France
| |
Collapse
|
7
|
Sobottka S, van der Meer MB, Glais E, Albold U, Suhr S, Su CY, Sarkar B. A coordinatively unsaturated iridium complex with an unsymmetrical redox-active ligand: (spectro)electrochemical and reactivity studies. Dalton Trans 2019; 48:13931-13942. [DOI: 10.1039/c9dt01597c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Metal–ligand cooperativity can be used in iridium complexes with an unsymmetrically substituted redox-active diamidobenzene ligand for bond activation reactions.
Collapse
Affiliation(s)
- Sebastian Sobottka
- Institut für Chemie und Biochemie
- Anorganische Chemie
- Freie Universität Berlin
- Berlin
- Germany
| | | | - Estelle Glais
- Institut für Chemie und Biochemie
- Anorganische Chemie
- Freie Universität Berlin
- Berlin
- Germany
| | - Uta Albold
- Institut für Chemie und Biochemie
- Anorganische Chemie
- Freie Universität Berlin
- Berlin
- Germany
| | - Simon Suhr
- Institut für Chemie und Biochemie
- Anorganische Chemie
- Freie Universität Berlin
- Berlin
- Germany
| | - Cheng-Yong Su
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou,510275
- China
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie
- Anorganische Chemie
- Freie Universität Berlin
- Berlin
- Germany
| |
Collapse
|
8
|
Molloy JK, Fedele L, Jarjayes O, Philouze C, Imbert D, Thomas F. Structural and spectroscopic investigations of redox active seven coordinate luminescent lanthanide complexes. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.08.054] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
9
|
Leconte N, Baptiste B, Philouze C, Thomas F. Structural snapshots of the rearrangement of the bis(di-tert-butyl-aminophenyl)amine pincer ligand in the presence of transition metal ions. Dalton Trans 2018; 47:11303-11307. [PMID: 30043034 DOI: 10.1039/c8dt02462f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The bis(di-tert-butyl-aminophenyl)amine ligand H3LN,N,N was reacted with Mn(ii), Co(ii), Fe(iii) and Cu(ii) salts in air. The ligand undergoes oxidative transformations, which involve intra and intermolecular C-N and N-N bond formations. A rare aromatic C-N bond cleavage leading to a C-O bond has also been observed.
Collapse
Affiliation(s)
- N Leconte
- Département de Chimie Moléculaire - Chimie Inorganique Redox (CIRE) - UMR CNRS 5250, Univ. Grenoble Alpes, B. P. 53, 38041 Grenoble cedex 9, France.
| | | | | | | |
Collapse
|
10
|
Huh DN, Ziller JW, Evans WJ. Isolation of reactive Ln(ii) complexes with C5H4Me ligands (CpMe) using inverse sandwich countercations: synthesis and structure of [(18-crown-6)K(μ-CpMe)K(18-crown-6)][CpMe3LnII] (Ln = Tb, Ho). Dalton Trans 2018; 47:17285-17290. [DOI: 10.1039/c8dt03890b] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report that crystallographically-characterizable Ln(ii) complexes of Tb and Ho can be isolated by reducing CpMe3Ln(THF) with KC8 in THF in the presence of 18-crown-6 (18-c-6).
Collapse
Affiliation(s)
- Daniel N. Huh
- Department of Chemistry
- University of California
- Irvine
- USA
| | | | | |
Collapse
|