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Cooper SM, White AJP, Eykyn TR, Ma MT, Miller PW, Long NJ. N-Centered Tripodal Phosphine Re(V) and Tc(V) Oxo Complexes: Revisiting a [3 + 2] Mixed-Ligand Approach. Inorg Chem 2022; 61:8000-8014. [PMID: 35544683 PMCID: PMC9131457 DOI: 10.1021/acs.inorgchem.2c00693] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
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N-Triphos derivatives
(NP3R, R = alkyl, aryl)
and asymmetric variants (NP2RXR′, R′ = alkyl, aryl, X = OH, NR2, NRR′) are
an underexplored class of tuneable, tripodal ligands in relation to
the coordination chemistry of Re and Tc for biomedical applications.
Mixed-ligand approaches are a flexible synthetic route to obtain Tc
complexes of differing core structures and physicochemical properties.
Reaction of the NP3Ph ligand with the Re(V)
oxo precursor [ReOCl3(PPh3)2] generated
the bidentate complex [ReOCl3(κ2-NP2PhOHAr)], which possesses an unusual
AA’BB’XX’ spin system with a characteristic second-order
NMR lineshape that is sensitive to the bi- or tridentate nature of
the coordinating diphosphine unit. The use of the asymmetric NP2PhOHAr ligand resulted in the formation
of both bidentate and tridentate products depending on the presence
of base. The tridentate Re(V) complex [ReOCl2(κ3-NP2PhOAr)] has provided
the basis of a new reactive “metal-fragment” for further
functionalization in [3 + 2] mixed-ligand complexes. The synthesis
of [3 + 2] complexes with catechol-based π-donors could also
be achieved under one-pot, single-step conditions from Re(V) oxo precursors.
Analogous complexes can also be synthesized from suitable 99Tc(V) precursors, and these complexes have been shown to exhibit
highly similar structural properties through spectroscopic and chromatographic
analysis. However, a tendency for the {MVO}3+ core to undergo hydrolysis to the {MVO2}+ core has been observed both in the case of M = Re and markedly
for M = 99Tc complexes. It is likely that controlling this
pathway will be critical to the generation of further stable Tc(V)
derivatives. An N-centered tripodal heterofunctionalized
phosphine ligand
was used to generate a reactive “metal-fragment” based
on the {MVO}3+ (M = Re, 99Tc) core
for the formation of mixed-ligand [3 + 2] complexes. Characteristic
lineshapes arising from an AA’BB’XX’ spin system
are diagnostic of bidentate vs tridentate coordination modes of the
ligand.
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Affiliation(s)
- Saul M Cooper
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK.,School of Biomedical Engineering & Imaging Sciences, King's College London, 4th Floor Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - Andrew J P White
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK
| | - Thomas R Eykyn
- School of Biomedical Engineering & Imaging Sciences, King's College London, 4th Floor Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - Michelle T Ma
- School of Biomedical Engineering & Imaging Sciences, King's College London, 4th Floor Lambeth Wing, St Thomas' Hospital, London SE1 7EH, UK
| | - Philip W Miller
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK
| | - Nicholas J Long
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, White City Campus, London W12 0BZ, UK
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Sergienko VS, Churakov AV. Crystal Structure of Monomeric Octahedral Monooxo d
2-Rhenium(V) Complexes [ReO($${\text{L}}_{{{\text{penta}}}}^{n}$$)] with Oxygen-Containing Pentadentate-Chelate Ligands. RUSS J INORG CHEM+ 2021. [DOI: 10.1134/s0036023621070111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sergienko VS, Churakov AV. Structural Features of Monomeric Octahedral Monooxo d
2-Rhenium(V) Complexes [ReO($${\text{L}}_{{{\text{tetra}}}}^{n}$$)(Lmono)] with Tetradentate Chelate (2O, 2N) Ligands Containing Oxygen and Nitrogen Atoms (Review). RUSS J INORG CHEM+ 2021. [DOI: 10.1134/s003602362101006x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Schachner JA, Belaj F, Mösch-Zanetti NC. Isomers in chlorido and alkoxido-substituted oxidorhenium(v) complexes: effects on catalytic epoxidation activity. Dalton Trans 2020; 49:11142-11149. [PMID: 32743619 DOI: 10.1039/d0dt02352c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses and characterizations of oxidorhenium(v) complexes trans-dichlorido [ReOCl2(PPh3)(L1a)] (trans-2a), cis-dichlorido [ReOCl2(PPh3)(L1b)] (cis-2b) and ethoxido-complex [ReO(OEt)(L1b)2] (4b), ligated with the dimethyloxazoline-phenol ligands HL1a and HL1b are described. The bidentate ligand HL1a (2-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)-phenol) is unsubstituted on the phenol ring; ligand HL1b (2-(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)-4-nitrophenol) contains a nitro group in para-position to the hydroxy group. In the reaction of precursor complex [ReOCl3(PPh3)2] and HL1a the two stereoisomers cis/trans-2a, with respect to chlorido ligands, are formed. The solid state structures of both isomers cis- and trans-2a were determined by single crystal X-ray diffraction analysis. In contrast, with ligand HL1b, only the cis-isomer cis-2b was obtained. Ethoxido-complex 4b is exclusively obtained when precursor [ReOCl3(OPPh3)(SMe2)] is reacted with 2 equiv. of HL1b in ethanol in the presence of the base 2,6-dimethylpyridine (lutidine). If no lutidine is added, chlorido-complex [ReOCl(L1b)2] (3b) is obtained. Complexes [ReOCl2(PPh3)(L1a)] (cis/trans-2a), [ReOCl2(PPh3)(L1b)] (cis-2b), [ReO(OMe)(L1a)2] (4a) and [ReO(OEt)(L1b)2] (4b) were tested as homogeneous catalysts in the benchmark reaction of cyclooctene epoxidation. The influence of isomerism and effects of ligand substitutions on catalytic activity was investigated. Based on the time-conversion plots it can be concluded that cis/trans-isomerism does not influence catalytic activity, but electron-withdrawing substituents, as in cis-2b, 3b and 4b, show a beneficial effect.
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Affiliation(s)
- Jörg A Schachner
- Institute of Chemistry, Inorganic Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| | - Ferdinand Belaj
- Institute of Chemistry, Inorganic Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
| | - Nadia C Mösch-Zanetti
- Institute of Chemistry, Inorganic Chemistry, University of Graz, Schubertstr. 1, 8010 Graz, Austria.
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Sergienko VS. Structural Features of Monomeric Octahedral Monooxo d2-Rhenium(V) Complexes [ReO(Lmono)($$L_{{{\text{tetra}}}}^{n}$$)] with Oxygen Atoms of Tridentate Chelate Ligands OХ3, Х = O, N, or P ($$L_{{{\text{tetra}}}}^{n}$$). RUSS J INORG CHEM+ 2019. [DOI: 10.1134/s0036023619090183] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Sergienko VS, Strashnova SB. Structure of Monomeric Octahedral d2-Rhenium(V) Monooxo Complexes [ReO(Ltri)(Lbi)] and [ReO(Ltetra)(Lmono)] with Oxygen Atoms of Tridentate (O, O, O) and Tetradentate (O, O, O, O) Chelating Ligands. RUSS J INORG CHEM+ 2019. [DOI: 10.1134/s0036023619070143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sergienko VS. Structural Features of Monomeric Octahedral Monooxo d2-Rhenium(V) Complexes [ReO(Ln)2(Lmono)] with Oxygen Atoms of Bidentate Chelate O,N Ligands (Ln): 1. Complexes with Five-Membered Chelate Rings ReNC2O. RUSS J INORG CHEM+ 2019. [DOI: 10.1134/s0036023619030185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sergienko VS, Churakov AV. Structural Features of Monomeric Octahedral Monooxo d2-Renium(V) Complexes with Oxygen Atoms of O,N Bidentate-Chelating Ligands (Ln): 2. [ReO(Ln)(Lmono)3] Complexes with Six- and Seven-Membered Chelate Rings ReNC3O and ReNC4O. RUSS J INORG CHEM+ 2018. [DOI: 10.1134/s0036023618060219] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sergienko VS, Churakov AV. Structural Features of Monomeric Octahedral d2-Rhenium(V) Monooxo Complexes with Oxygen Atoms of О, N Bidentate Chelating Ligands (L
n
). Part 1: [ReO(L
n
)(Lmono)3] Complexes Containing Five-Membered Chelate Rings ReNC2O. RUSS J INORG CHEM+ 2018. [DOI: 10.1134/s0036023618050121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Sergienko VS, Churakov AV. Structural features of monomeric octahedral d
2-rhenium(V) monooxo complexes with oxygen atoms of bidentate-chelating neutral and acidic ligands (O,P). RUSS J INORG CHEM+ 2017. [DOI: 10.1134/s0036023617100151] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Sergienko VS. Structural features of monomeric octahedral d
2-rhenium(V) monooxo complexes with the oxygen atoms of bidentate chelate (О,S and О,С) acido ligands. RUSS J INORG CHEM+ 2017. [DOI: 10.1134/s0036023617060195] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sergienko VS, Churakov AV. Structural features of monomeric octahedral d 2-rhenium(V) monooxo complexes with oxygen atoms of bidentate-chelating acido (O,O)-ligands. RUSS J INORG CHEM+ 2016. [DOI: 10.1134/s0036023616140047] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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