1
|
Nakaya K, Takahashi S, Ishii A, Nakata N. Iminophosphonamido-Supported Plumbylenes and Plumbyliumylidenes: Synthesis and Properties. Inorg Chem 2022; 61:15510-15519. [PMID: 36129289 DOI: 10.1021/acs.inorgchem.2c02209] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of low-valent lead(II) species, i.e., plumbylenes and plumbyliumylidenes supported by an N,N'-di-tert-butyliminophosphonamide ligand, have been synthesized. Chloroplumbylene [Ph2P(NtBu)2PbCl] (1) was readily prepared by the reaction of the corresponding lithium iminophosphonamide and PbCl2 in THF. The substitution reaction of 1 with KN(SiMe3)2 in THF afforded the corresponding aminoplumbylene [Ph2P(NtBu)2PbN(SiMe3)2] (2) in the form of colorless crystals. The structures of these plumbylenes in the solid state and in solution were exhaustively characterized using multinuclear NMR spectroscopy and X-ray diffraction analysis. In the crystalline state, 1 adopts a nearly linear polymeric structure in the direction of the c axis via Pb-Cl bonds, with alternating four-membered PbN2P rings. The chloride-abstraction reaction of 1 using Na[B(C6F5)4] in fluorobenzene proceeded efficiently at ambient temperature to furnish plumbyliumylidene [Ph2P(NtBu)2Pb:]+ (3+), which was isolated as the air-sensitive yellow borate salt 3[B(C6F5)4]. Plumbyliumylidene 3[B(C6F5)4] acts as a Lewis acid catalyst for the hydroboration of benzophenone and benzaldehyde at catalyst loadings of as low as 0.1 mol % under ambient conditions. Furthermore, the details of the reaction mechanism are discussed on the basis of the results of DFT calculations.
Collapse
Affiliation(s)
- Kazuki Nakaya
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Shintaro Takahashi
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Akihiko Ishii
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Norio Nakata
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| |
Collapse
|
2
|
Ho LP, Tamm M. Chalcogen‐Pnictogen Complexes of Anionic N‐Heterocyclic Carbenes with a Weakly Coordinating Borate Moiety. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Luong Phong Ho
- Technische Universität Braunschweig: Technische Universitat Braunschweig Institut für Anorganische und Analytische Chemie GERMANY
| | - Matthias Tamm
- Technische Universität Braunschweig Institut für Anorganische und Analytische Chemie Hagenring 30 38106 Braunschweig GERMANY
| |
Collapse
|
3
|
Saab M, Nelson DJ, Leech MC, Lam K, Nolan SP, Nahra F, Van Hecke K. Reactions of N-heterocyclic carbene-based chalcogenoureas with halogens: a diverse range of outcomes. Dalton Trans 2022; 51:3721-3733. [PMID: 35169826 DOI: 10.1039/d2dt00010e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have investigated the reactions of chalcogenoureas derived from N-heterocyclic carbenes, referred to here as [E(NHC)], with halogens. Depending on the structure of the chalcogenourea and the identity of the halogen, a diverse range of reactivity was observed and a corresponding range of structures was obtained. Cyclic voltammetry was carried out to characterise the oxidation and reduction potentials of these [E(NHC)] species; selenoureas were found to be easier to oxidise than the corresponding thioureas. In some cases, a correlation was found between the oxidation potential of these compounds and the electronic properties of the corresponding NHC. The reactivity of these chalcogenoureas with different halogenating reagents (Br2, SO2Cl2, I2) was then investigated, and products were characterised using NMR spectroscopy and single-crystal X-ray diffraction. X-ray analyses elucidated the solid-state coordination types of the obtained products, showing that a variety of possible adducts can be obtained. In some cases, we were able to extrapolate a structure/activity correlation to explain the observed trends in reactivity and oxidation potentials.
Collapse
Affiliation(s)
- Marina Saab
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium.
| | - David J Nelson
- WestCHEM Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, Scotland, UK
| | - Matthew C Leech
- School of Science, University of Greenwich, Chatham Maritime ME4 4TB, UK
| | - Kevin Lam
- School of Science, University of Greenwich, Chatham Maritime ME4 4TB, UK
| | - Steven P Nolan
- Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium
| | - Fady Nahra
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium. .,VITO (Flemish Institute for Technological Research), Boeretang 200, 2400 Mol, Belgium.
| | - Kristof Van Hecke
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium.
| |
Collapse
|
4
|
Voloshkin VA, Tzouras NV, Nolan SP. Recent advances in the synthesis and derivatization of N-heterocyclic carbene metal complexes. Dalton Trans 2021; 50:12058-12068. [PMID: 34519733 DOI: 10.1039/d1dt01847g] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
N-heterocyclic carbene (NHC) metal complexes have gained an incredible amount of attention in the course of the last two decades and have become indispensable as an intricate part of a plethora of applications. The areas of their synthesis and derivatization are constantly evolving and bring new, more sustainable, cost-effective and simpler approaches to the design of existing and next generation catalysts and materials. This article provides an overview of the latest developments, focusing on those which have appeared during the last two years.
Collapse
Affiliation(s)
- Vladislav A Voloshkin
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University, Krijgslaan 281 (S-3), 9000 Ghent, Belgium.
| | - Nikolaos V Tzouras
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University, Krijgslaan 281 (S-3), 9000 Ghent, Belgium.
| | - Steven P Nolan
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University, Krijgslaan 281 (S-3), 9000 Ghent, Belgium.
| |
Collapse
|
5
|
Rottschäfer D, Fuhs DE, Neumann B, Stammler H, Ghadwal RS. Saturated NHC Derived Dichalcogen Dications. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000189] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Dennis Rottschäfer
- Anorganische Molekülchemie und Katalyse Lehrstuhl für Anorganische Chemie und Strukturchemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Désirée E. Fuhs
- Anorganische Molekülchemie und Katalyse Lehrstuhl für Anorganische Chemie und Strukturchemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Beate Neumann
- Anorganische Molekülchemie und Katalyse Lehrstuhl für Anorganische Chemie und Strukturchemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Hans‐Georg Stammler
- Anorganische Molekülchemie und Katalyse Lehrstuhl für Anorganische Chemie und Strukturchemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Rajendra S. Ghadwal
- Anorganische Molekülchemie und Katalyse Lehrstuhl für Anorganische Chemie und Strukturchemie Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| |
Collapse
|
6
|
Saab M, Nelson DJ, Tzouras NV, A. C. A. Bayrakdar T, Nolan SP, Nahra F, Van Hecke K. Straightforward access to chalcogenoureas derived from N-heterocyclic carbenes and their coordination chemistry. Dalton Trans 2020; 49:12068-12081. [PMID: 32820302 DOI: 10.1039/d0dt02558e] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we describe a straightforward access to chalcogenoureas derived from N-heterocyclic carbenes, and we investigate the coordination chemistry of selenoureas with coinage metals.
Collapse
Affiliation(s)
- Marina Saab
- Department of Chemistry
- Ghent University
- 9000 Ghent
- Belgium
| | - David J. Nelson
- WestCHEM Department of Pure & Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | | | | | | | - Fady Nahra
- Department of Chemistry
- Ghent University
- 9000 Ghent
- Belgium
- VITO (Flemish Institute for Technological Research)
| | | |
Collapse
|
7
|
Ho LP, Körner L, Bannenberg T, Tamm M. Chalcogen complexes of anionic N-heterocyclic carbenes. Dalton Trans 2020; 49:13207-13217. [DOI: 10.1039/d0dt02392b] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Chalcogen complexes of anionic N-heterocyclic carbenes were isolated as lithium salts and their protonation and oxidation were studied.
Collapse
Affiliation(s)
- Luong Phong Ho
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| | - Lukas Körner
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| |
Collapse
|