Bimetallics in a Nutshell: Complexes Supported by Chelating Naphthyridine-Based Ligands
Abstract
Bimetallic motifs are a structural feature common to some of the most effective and synthetically useful catalysts known, including in the active sites of many metalloenzymes and on the surfaces of industrially relevant heterogeneous materials. However, the complexity of these systems often hampers detailed studies of their fundamental properties. To glean valuable mechanistic insight into how these catalysts function, this research group has prepared a family of dinucleating 1,8-naphthyridine ligands that bind two first-row transition metals in close proximity, originally designed to help mimic the proposed active site of metal oxide surfaces. Of the various bimetallic combinations examined, dicopper(I) is particularly versatile, as neutral bridging ligands adopt a variety of different binding modes depending on the configuration of frontier orbitals available to interact with the Cu centers. Organodicopper complexes are readily accessible, either through the traditional route of salt metathesis or via the activation of tetraarylborate anions through aryl group abstraction by a dicopper(I) unit. The resulting bridging aryl complexes engage in C-H bond activations, notably with terminal alkynes to afford bridging alkynyl species. In this work, the μ-hydrocarbyl complexes are surprisingly tolerant of water and elevated temperatures. This stability was leveraged to isolate a species that typically represents amore »
- Authors:
-
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH); Natural Sciences and Engineering Research Council of Canada (NSERC); Fulbright; Link Foundation; European Union’s Horizon 2020; National Science Foundation (NSF)
- OSTI Identifier:
- 1782189
- Grant/Contract Number:
- AC02-05CH11231; S10-RR027172; S10OD024998; S10OD023532; DGE 1106400
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Accounts of Chemical Research
- Additional Journal Information:
- Journal Volume: 53; Journal Issue: 9; Journal ID: ISSN 0001-4842
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Hydrocarbons; Anions; Ligands; Catalysts; Bimetals
Citation Formats
Desnoyer, Addison N., Nicolay, Amélie, Rios, Pablo, Ziegler, Micah S., and Tilley, T. Don. Bimetallics in a Nutshell: Complexes Supported by Chelating Naphthyridine-Based Ligands. United States: N. p., 2020.
Web. doi:10.1021/acs.accounts.0c00382.
Desnoyer, Addison N., Nicolay, Amélie, Rios, Pablo, Ziegler, Micah S., & Tilley, T. Don. Bimetallics in a Nutshell: Complexes Supported by Chelating Naphthyridine-Based Ligands. United States. https://doi.org/10.1021/acs.accounts.0c00382
Desnoyer, Addison N., Nicolay, Amélie, Rios, Pablo, Ziegler, Micah S., and Tilley, T. Don. Wed .
"Bimetallics in a Nutshell: Complexes Supported by Chelating Naphthyridine-Based Ligands". United States. https://doi.org/10.1021/acs.accounts.0c00382. https://www.osti.gov/servlets/purl/1782189.
@article{osti_1782189,
title = {Bimetallics in a Nutshell: Complexes Supported by Chelating Naphthyridine-Based Ligands},
author = {Desnoyer, Addison N. and Nicolay, Amélie and Rios, Pablo and Ziegler, Micah S. and Tilley, T. Don},
abstractNote = {Bimetallic motifs are a structural feature common to some of the most effective and synthetically useful catalysts known, including in the active sites of many metalloenzymes and on the surfaces of industrially relevant heterogeneous materials. However, the complexity of these systems often hampers detailed studies of their fundamental properties. To glean valuable mechanistic insight into how these catalysts function, this research group has prepared a family of dinucleating 1,8-naphthyridine ligands that bind two first-row transition metals in close proximity, originally designed to help mimic the proposed active site of metal oxide surfaces. Of the various bimetallic combinations examined, dicopper(I) is particularly versatile, as neutral bridging ligands adopt a variety of different binding modes depending on the configuration of frontier orbitals available to interact with the Cu centers. Organodicopper complexes are readily accessible, either through the traditional route of salt metathesis or via the activation of tetraarylborate anions through aryl group abstraction by a dicopper(I) unit. The resulting bridging aryl complexes engage in C-H bond activations, notably with terminal alkynes to afford bridging alkynyl species. In this work, the μ-hydrocarbyl complexes are surprisingly tolerant of water and elevated temperatures. This stability was leveraged to isolate a species that typically represents a fleeting intermediate in Cu-catalyzed azide-alkyne coupling (CuAAC); reaction of a bridging alkynyl complex with an organic azide afforded the first example of a well-defined, symmetrically bridged dicopper triazolide. This complex was shown to be an intermediate during CuAAC, providing support for a proposed bimetallic mechanism. These platforms are not limited to formally low oxidation states; chemical oxidation of the hydrocarbyl complexes cleanly results in formation of mixed valence CuICuII complexes with varying degrees of distortion in both the bridging moiety and the dicopper core. Higher oxidation states, e.g., dicopper(II), are easily accessed via oxidation of a dicopper(I) compound with air to give a CuII2(μ-OH)2 complex. Reduction of this compound with silanes resulted in the unexpected formation of pentametallic copper(I) dihydride clusters or trimetallic monohydride complexes, depending on the nature of the silane. Finally, development of an unsymmetrical naphthyridine ligand with mixed donor side-arms enables selective synthesis of an isostructural series of six heterobimetallic complexes, demonstrating the power of ligand design in the preparation of heterometallic assemblies.},
doi = {10.1021/acs.accounts.0c00382},
journal = {Accounts of Chemical Research},
number = 9,
volume = 53,
place = {United States},
year = {Wed Sep 02 00:00:00 EDT 2020},
month = {Wed Sep 02 00:00:00 EDT 2020}
}
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