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Coll RP, Dunbar KR. Three Reversible Redox States of Thiolate-Bridged Dirhodium Complexes without Metal–Metal Bonds. J Am Chem Soc 2020; 142:16313-16323. [DOI: 10.1021/jacs.0c06205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Ryan P. Coll
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Kim R. Dunbar
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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Yi X, Liu B, Chen K, Chen W, Chen W. Unbridged Rh(ii)–Rh(ii) complexes of N-heterocyclic carbenes and reactions with O2 to form dirhodium(μ–η1:η1-O2) complexes. Dalton Trans 2019; 48:3835-3839. [DOI: 10.1039/c9dt00421a] [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
Dimeric rhodium(ii) [Rh(L)(CH3CN)]2(PF6)4 and rhodium(iii) peroxide [Rh(L)(PPh3)]2(μ–η1:η1-O2)(PF6)4 and [Rh(L)(PCy3)]2(μ–η1:η1-O2)(PF6)4 (L = bis(N-pyridylimidazolylidenyl)methane) were reported.
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Affiliation(s)
- Xiaofei Yi
- Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Bin Liu
- Zhejiang Province Key Laboratory of Noble Metal Catalytic Materials and Technology
- Hangzhou
- China
| | - Kai Chen
- Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Wei Chen
- Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Wanzhi Chen
- Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
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Martínez-Martínez AJ, Tegner BE, McKay AI, Bukvic AJ, Rees NH, Tizzard GJ, Coles SJ, Warren MR, Macgregor SA, Weller AS. Modulation of σ-Alkane Interactions in [Rh(L 2)(alkane)] + Solid-State Molecular Organometallic (SMOM) Systems by Variation of the Chelating Phosphine and Alkane: Access to η 2,η 2-σ-Alkane Rh(I), η 1-σ-Alkane Rh(III) Complexes, and Alkane Encapsulation. J Am Chem Soc 2018; 140:14958-14970. [PMID: 30351014 DOI: 10.1021/jacs.8b09364] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Solid/gas single-crystal to single-crystal (SC-SC) hydrogenation of appropriate diene precursors forms the corresponding σ-alkane complexes [Rh(Cy2P(CH2) nPCy2)(L)][BArF4] ( n = 3, 4) and [ RhH(Cy2P(CH2)2( CH)(CH2)2PCy2)(L)][BArF4] ( n = 5, L = norbornane, NBA; cyclooctane, COA). Their structures, as determined by single-crystal X-ray diffraction, have cations exhibiting Rh···H-C σ-interactions which are modulated by both the chelating ligand and the identity of the alkane, while all sit in an octahedral anion microenvironment. These range from chelating η2,η2 Rh···H-C (e.g., [Rh(Cy2P(CH2) nPCy2)(η2η2-NBA)][BArF4], n = 3 and 4), through to more weakly bound η1 Rh···H-C in which C-H activation of the chelate backbone has also occurred (e.g., [ RhH(Cy2P(CH2)2( CH)(CH2)2PCy2)(η1-COA)][BArF4]) and ultimately to systems where the alkane is not ligated with the metal center, but sits encapsulated in the supporting anion microenvironment, [Rh(Cy2P(CH2)3PCy2)][COA⊂BArF4], in which the metal center instead forms two intramolecular agostic η1 Rh···H-C interactions with the phosphine cyclohexyl groups. CH2Cl2 adducts formed by displacement of the η1-alkanes in solution ( n = 5; L = NBA, COA), [ RhH(Cy2P(CH2)2( CH)(CH2)2PCy2)(κ1-ClCH2Cl)][BArF4], are characterized crystallographically. Analyses via periodic DFT, QTAIM, NBO, and NCI calculations, alongside variable temperature solid-state NMR spectroscopy, provide snapshots marking the onset of Rh···alkane interactions along a C-H activation trajectory. These are negligible in [Rh(Cy2P(CH2)3PCy2)][COA⊂BArF4]; in [ RhH(Cy2P(CH2)2( CH)(CH2)2PCy2)(η1-COA)][BArF4], σC-H → Rh σ-donation is supported by Rh → σ*C-H "pregostic" donation, and in [Rh(Cy2P(CH2) nPCy2)(η2η2-NBA)][BArF4] ( n = 2-4), σ-donation dominates, supported by classical Rh(dπ) → σ*C-H π-back-donation. Dispersive interactions with the [BArF4]- anions and Cy substituents further stabilize the alkanes within the binding pocket.
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Affiliation(s)
| | - Bengt E Tegner
- Institute of Chemical Sciences , Heriot-Watt University , Edinburgh EH14 4AS , United Kingdom
| | - Alasdair I McKay
- Chemistry Research Laboratories , University of Oxford , Oxford OX1 3TA , United Kingdom
| | - Alexander J Bukvic
- Chemistry Research Laboratories , University of Oxford , Oxford OX1 3TA , United Kingdom
| | - Nicholas H Rees
- Chemistry Research Laboratories , University of Oxford , Oxford OX1 3TA , United Kingdom
| | - Graham J Tizzard
- UK National Crystallography Service, Chemistry, Faculty of Natural and Environmental Sciences , University of Southampton , Southampton SO17 1BJ , United Kingdom
| | - Simon J Coles
- UK National Crystallography Service, Chemistry, Faculty of Natural and Environmental Sciences , University of Southampton , Southampton SO17 1BJ , United Kingdom
| | - Mark R Warren
- Harwell Science and Innovation Campus, Diamond Light Source Ltd. , Didcot OX11 0DE , United Kingdom
| | - Stuart A Macgregor
- Institute of Chemical Sciences , Heriot-Watt University , Edinburgh EH14 4AS , United Kingdom
| | - Andrew S Weller
- Chemistry Research Laboratories , University of Oxford , Oxford OX1 3TA , United Kingdom
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Reactivity of Rhodium(II) amido/Rhodium(I) aminyl complexes. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.06.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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