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Enriquez Garcia A, Jalilehvand F, Niksirat P. Reactions of Rh 2(CH 3COO) 4 with thiols and thiolates: a structural study. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:450-461. [PMID: 30855255 PMCID: PMC6412178 DOI: 10.1107/s160057751900033x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 01/07/2019] [Indexed: 06/09/2023]
Abstract
The structural differences between the aerobic reaction products of Rh2(AcO)4 (1; AcO- = CH3COO-) with thiols and thiolates in non-aqueous media are probed by X-ray absorption spectroscopy. For this study, ethanethiol, dihydrolipoic acid (DHLA; a dithiol) and their sodium thiolate salts were used. Coordination of simple thiols to the axial positions of Rh2(AcO)4 with Rh-SH bonds of 2.5-2.6 Å keeps the RhII-RhII bond intact (2.41 ± 0.02 Å) but leads to a colour change from emerald green to burgundy. Time-dependent density functional theory (TD-DFT) calculations were performed to explain the observed shifts in the electronic (UV-vis) absorption spectra. The corresponding sodium thiolates, however, break up the Rh2(AcO)4 framework in the presence of O2 to form an oligomeric chain of triply S-bridged Rh(III) ions, each with six Rh-S (2.36 ± 0.02 Å) bonds. The RhIII...RhIII distance, 3.18 ± 0.02 Å, in the chain is similar to that previously found for the aerobic reaction product from aqueous solutions of Rh2(AcO)4 and glutathione (H3A), {Na2[Rh2III(HA)4]·7H2O}n, in which each Rh(III) ion is surrounded by about four Rh-S (2.33 ± 0.02 Å) and about two Rh-O (2.08 ± 0.02 Å). The reaction products obtained in this study can be used to predict how dirhodium(II) tetracarboxylates would react with cysteine-rich proteins and peptides, such as metallothioneins.
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Affiliation(s)
- Alejandra Enriquez Garcia
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Farideh Jalilehvand
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Pantea Niksirat
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
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Ehlich H, Schier A, Schmidbaur H. Aurophilicity-based one-dimensional arrays of gold(I) phenylene-1,3- and -1,4-dithiolates. Inorg Chem 2002; 41:3721-7. [PMID: 12099877 DOI: 10.1021/ic020107i] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phenylene-1,3-dithiol is converted into a trinuclear gold complex by treatment with 1 equiv of [[(Ph(3)P)Au](3)O](+)BF(4)(-). In the product, the phenylene unit bears one gold thiolate and one di(gold)sulfonium function. These components aggregate into one-dimensional arrays through head-to-tail aurophilic contacts between the two functions. In the association process, the Au[bond]S[bond]Au angle of the sulfonium group is opened up to accommodate the incoming gold atom between its metal centers. A similar mode of aggregation is found for the triply aurated biphenylene-4,4'-dithiol obtained using the tri(gold)oxonium salt with tri(p-tolyl)phosphine ligands. Probably for steric reasons, in this oligomerization process, the gold(I) thiolate unit is attached side-on to the digold sulfonium unit with retention of the small Au[bond]S[bond]Au angle. Under similar reaction conditions, and with the same molar ratio of the components, phenylene-1,4-dithiol is converted into the bis-sulfonium salt: 1,4-[[(p-Tol)(3)PAu](2)S](2)C(6)H(4)(BF(4))(2), the dications of which also associate into chains. Along the chains, the phenylene spacers alternate with tetranuclear gold clusters which arise from intimate aggregation of pairs of gold atoms. Together with previous findings, the present results show that gold thiolate (-SAuL) and digold sulfonium functions [-S(AuL)(2)(+)] in proper orientation at an arene unit (alpha-omega) can be considered as "soldering" points which can be used for joining up the molecular units into one-dimensional arrays solely through metal-metal contacts, which appear to be operative even against Coulomb repulsion between cations. The reaction of biphenylene-4,4'-dithiol with 2 equiv of sodium methoxide and [tri(c-hexyl)phosphine]gold chloride gives only neutral digold dithiolate complex 4 which is not associated owing to the steric bulk of the tri(c-hexyl)phosphine ligands.
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Affiliation(s)
- Hendrik Ehlich
- Anorganisch-chemisches Institut der Technischen Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
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Sauvageot P, Blacque O, Kubicki MM, Jugé S, Moïse C. Optically Active Bimetallic Complexes with a Tantalum Atom as a Chiral Center. Synthesis, Characterization, and X-ray Structures of Two Diastereoisomers: Cp‘CpTa*(CO)(μ-PMe2)W(CO)4L* (Cp‘ = 1-tBu-3,4-Me2-C5H2; L* = (R)-(+)-Phenyl(o-anisyl)methylphosphine (PAMP)). Organometallics 1996. [DOI: 10.1021/om9600497] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Philippe Sauvageot
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques (URA 1685), Université de Bourgogne, Faculté des Sciences, 6 boulevard Gabriel, 21000 Dijon, France, and Equipe “Réactivités specifiques”, Université de Cergy Pontoise, BP 8428, 47 avenue des Génottes, 95806 Cergy Pontoise Cedex, France
| | - Olivier Blacque
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques (URA 1685), Université de Bourgogne, Faculté des Sciences, 6 boulevard Gabriel, 21000 Dijon, France, and Equipe “Réactivités specifiques”, Université de Cergy Pontoise, BP 8428, 47 avenue des Génottes, 95806 Cergy Pontoise Cedex, France
| | - Marek M. Kubicki
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques (URA 1685), Université de Bourgogne, Faculté des Sciences, 6 boulevard Gabriel, 21000 Dijon, France, and Equipe “Réactivités specifiques”, Université de Cergy Pontoise, BP 8428, 47 avenue des Génottes, 95806 Cergy Pontoise Cedex, France
| | - Sylvain Jugé
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques (URA 1685), Université de Bourgogne, Faculté des Sciences, 6 boulevard Gabriel, 21000 Dijon, France, and Equipe “Réactivités specifiques”, Université de Cergy Pontoise, BP 8428, 47 avenue des Génottes, 95806 Cergy Pontoise Cedex, France
| | - Claude Moïse
- Laboratoire de Synthèse et d'Electrosynthèse Organométalliques (URA 1685), Université de Bourgogne, Faculté des Sciences, 6 boulevard Gabriel, 21000 Dijon, France, and Equipe “Réactivités specifiques”, Université de Cergy Pontoise, BP 8428, 47 avenue des Génottes, 95806 Cergy Pontoise Cedex, France
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