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Osenga V, Sykes NC, Pa S, Bambha MK, Schley ND, Johnson MW. Comparative Analysis of the Donor Properties of Isomeric Pyrrolyl Phosphine Ligands. Organometallics 2024; 43:14-20. [PMID: 38213984 PMCID: PMC10777409 DOI: 10.1021/acs.organomet.3c00467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/11/2023] [Accepted: 12/11/2023] [Indexed: 01/13/2024]
Abstract
Understanding the net donor and electronic properties of pyrrole-based phosphines is critical for guiding their use as ligands. In this study, we compare two isomeric 1- and 2-(diphenylphosphino)methylpyrroles (L1 and L2, respectively) to determine the degree to which N-(phosphino)pyrroles are distinct from aryl- and 2-pyrrolyl phosphines. Ruthenium, rhodium, platinum, and gold complexes as well as selenide derivatives of these ligands are examined using NMR and IR spectroscopy, X-ray crystallography, and cyclic voltammetry. Ligand L2 exhibits net donor properties similar to those of the o-tolyl analogue L3, while L1 shows attenuated electron donation ability. Additionally, a model nickel-catalyzed Kumada coupling reaction using these three ligands was investigated.
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Affiliation(s)
- Vicky
A. Osenga
- Department
of Chemistry, University of Richmond, Richmond, Virginia 23173, United States
| | - Nolan C. Sykes
- Department
of Chemistry, University of Richmond, Richmond, Virginia 23173, United States
| | - Sopheak Pa
- Department
of Chemistry, University of Richmond, Richmond, Virginia 23173, United States
| | - Michael K. Bambha
- Department
of Chemistry, University of Richmond, Richmond, Virginia 23173, United States
| | - Nathan D. Schley
- Department
of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Miles W. Johnson
- Department
of Chemistry, University of Richmond, Richmond, Virginia 23173, United States
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Abstract
Gold phosphine derivatives such as thiolates have been recently proposed as catalysts or catalyst precursors. The relevance of the supramolecular environment on the fine-tuning of the catalytical activity on these compounds incentivizes the use of tools that are convenient to characterize in detail the non-covalent landscape of the systems. Herein, we show the molecular and supramolecular diversity caused by the changes in the fluorination pattern in a family of new XPhos goldfluorothiolate derivatives. Furthermore, we studied the supramolecular interactions around the Au centers using quantum chemical topology tools, in particular the quantum theory of atoms in molecules (QTAIM) and the non-covalent interaction index. Our results give detailed insights into the fluorination effects on the strength of intramolecular and intermolecular interactions in these systems. We have also used QTAIM delocalization indexes to define a novel hapticity indicator. Finally, we assessed the trans influence of the fluorothiolates on the phosphine in terms of the change in the δ 31P-NMR. These results show the feasibility of the use of fluorination in the modulation of the electronic properties of Buchwald phosphine gold(I) compounds, and thereby its potential catalytic activity.
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Straube A, Coburger P, Michak M, Ringenberg MR, Hey-Hawkins E. The core of the matter - arene substitution determines the coordination and catalytic behaviour of tris(1-phosphanyl-1'-ferrocenylene)arene gold(I) complexes. Dalton Trans 2020; 49:16667-16682. [PMID: 33084677 DOI: 10.1039/d0dt02743j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Changing the aromatic core of C3-symmetric tris(ferrocenyl)arene-based tris-phosphanes has profound effects on their coordination behaviour towards gold(i). Depending on the arene (s-triazine, benzene, or trifluorobenzene), four different coordination modes can be distinguished and their preference has been rationalised using computational methods. The corresponding 1 : 1 ligand-to-metal complexes, studied by variable-temperature NMR spectroscopy, revealed fluctional behaviour in solution. Given the presence of up to three or six ferrocenylene spacers per complex, their electrochemistry was investigated. The redox-responsive nature of the complexes can be advantageously exploited in the catalytic ring-closing isomerisation of N-(2-propyn-1-yl)benzamide, where the benzene-based 2 : 3 ligand-to-metal complex has been shown to display multiple activity states depending on the degree of (reversible) oxidation in a preliminary trial.
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Affiliation(s)
- Axel Straube
- Institute of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany.
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Rocchigiani L, Bochmann M. Recent Advances in Gold(III) Chemistry: Structure, Bonding, Reactivity, and Role in Homogeneous Catalysis. Chem Rev 2020; 121:8364-8451. [DOI: 10.1021/acs.chemrev.0c00552] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Luca Rocchigiani
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR47TJ, United Kingdom
| | - Manfred Bochmann
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR47TJ, United Kingdom
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Romo-Islas G, Moreno-Alcántar G, Flores-Álamo M, Torrens H. Synthesis, crystal structure and fluorination effects in vinylidenebis(diphenylphosphine)gold(I) thiolate coordination compounds. J Fluor Chem 2020. [DOI: 10.1016/j.jfluchem.2020.109578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Moreno-Alcántar G, Turcio-García L, Guevara-Vela JM, Romero-Montalvo E, Rocha-Rinza T, Pendás ÁM, Flores-Álamo M, Torrens H. Directing the Crystal Packing in Triphenylphosphine Gold(I) Thiolates by Ligand Fluorination. Inorg Chem 2020; 59:8667-8677. [PMID: 32551606 DOI: 10.1021/acs.inorgchem.9b03131] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We explore herein the supramolecular interactions that control the crystalline packing in a series of fluorothiolate triphenylphosphine gold(I) compounds with the general formula [Au(SRF)(Ph3P)] in which Ph3P = triphenylphosphine and SRF = SC6F5, SC6HF4-4, SC6F4(CF3)-4, SC6H3F2-2,4, SC6H3F2-3,4, SC6H3F2-3,5, SC6H4(CF3)-2, SC6H4F-2, SC6H4F-3, SC6H4F-4, SCF3, and SCH2CF3. We use for this purpose (i) DFT electronic structure calculations and (ii) the quantum theory of atoms in molecules and the non-covalent interactions index methods of wave function analyses. Our combined experimental and computational approach yields a general understanding of the effects of ligand fluorination in the crystalline self-assembly of the examined systems, in particular, about the relative force of aurophilic contacts compared with other supramolecular interactions. We expect this information to be useful in the design of materials based on gold coordination compounds.
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Affiliation(s)
- Guillermo Moreno-Alcántar
- School of Chemistry, National Autonomous University of Mexico, Circuito Escolar, Ciudad Universitaria, Coyoacán, 04510 Mexico City, Mexico.,Institut de Science et d' Ingénierie Supramoléculaires (ISIS), University of Strasbourg, 8 alleé Gaspard Monge, 67000, Strasbourg, France
| | - Luis Turcio-García
- School of Chemistry, National Autonomous University of Mexico, Circuito Escolar, Ciudad Universitaria, Coyoacán, 04510 Mexico City, Mexico
| | - José M Guevara-Vela
- Institute of Chemistry, National Autonomous University of Mexico, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510, Mexico City, Mexico
| | - Eduardo Romero-Montalvo
- Institute of Chemistry, National Autonomous University of Mexico, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510, Mexico City, Mexico
| | - Tomás Rocha-Rinza
- Institute of Chemistry, National Autonomous University of Mexico, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510, Mexico City, Mexico
| | - Ángel Martín Pendás
- Department of Analytical and Physical Chemistry, University of Oviedo, E-33006, Julián Clavería, 8, 33006, Oviedo, Spain
| | - Marcos Flores-Álamo
- School of Chemistry, National Autonomous University of Mexico, Circuito Escolar, Ciudad Universitaria, Coyoacán, 04510 Mexico City, Mexico
| | - Hugo Torrens
- School of Chemistry, National Autonomous University of Mexico, Circuito Escolar, Ciudad Universitaria, Coyoacán, 04510 Mexico City, Mexico
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