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Título: | Metal–metal cooperation in the oxidation of a flapping platinum butterfly by haloforms: Experimental and theoretical evidence |
Autor: | Sicilia, Violeta CSIC ORCID; Arnal, Lorenzo CSIC ORCID; Fuertes, Sara CSIC ORCID; Martín, Antonio CSIC ORCID; Baya, Miguel CSIC ORCID | Fecha de publicación: | 2020 | Editor: | ACS Publications | Citación: | Inorganic Chemistry 59(17): 12586-12594 (2020) | Resumen: | The model 1-DFT for the butterfly complex [{Pt(C∧C*)(μ-pz)}2] (1; HC∧C* = 1-(4-(ethoxycarbonyl)phenyl)-3-methyl-1H-imidazol-2-ylidene) shows two minima in the potential energy surface of the ground state in acetone solution: the butterfly-wing-spreading molecules 1-s, (dPt–Pt ≈ 3.20 Å) and the wing-folding molecules 1-f (dPt–Pt ≤ 3.00 Å). Both minima are very close in energy (ΔG° = 1.7 kcal/mol) and are connected through a transition state, which lies only 1.9 kcal/mol above 1-s and 0.2 kcal/mol above 1-f. These very low barriers support a fast interconversion process, resembling a butterfly flapping, and the presence of both conformers in acetone solution. However, the 1-f ratio is so low that it is undetectable in the excitation and emission spectra of 1 in 2-MeTHF of diluted solutions (10–5 M) at 77 K, while it is seen in more concentrated solutions (10–3 M). In acetone solution, 1 undergoes a [2c, 2e] oxidation by CHX3 (X = Cl, Br) in the sunlight to render the Pt2(III,III) compounds [{Pt(C∧C*)(μ-pz)X)}2] (X = Cl (2-Cl), Br (2-Br)). In concentrated solutions, 1 can react with CHCl3 under blue light to give 2-Cl and with CHBr3 in the dark, the latter rendering the compound [BrPt(C∧C*)(μ-pz)2Pt(C∧C*)CHBr2] (3-Br) or mixtures of 2-Br and 3-Br if the reaction is performed under an argon atmosphere or in the air, respectively. Mechanistic studies showed that in concentrated solutions the oxidation processes follow a radical mechanism being the MMLCT-based species 1-f, those which trigger the reaction of 1 with CHBr3 and CHCl3. In the ground state (S0f), it promotes the thermal oxidation of 1 by CHBr3 and in the first singlet excited state (S1f) the blue-light-driven photooxidation of 1 by CHCl3. Complexes, 2-Cl, 2-Br, and 3-Br were selectively obtained and fully characterized, showing Pt–Pt distances (ca. 2.6 Å) shorter than that of the starting complex, 1. They are, together with the analogous [{Pt(C∧C*)(μ-pz)I)}2] and [IPt(C∧C*)(μ-pz)2Pt(C∧C*)CHI2], the only dinuclear metal–metal-bonded PtIII(μ-pz)2PtIII compounds reported to date. | Versión del editor: | https://doi.org/10.1021/acs.inorgchem.0c01701 | URI: | http://hdl.handle.net/10261/233216 | DOI: | 10.1021/acs.inorgchem.0c01701 | E-ISSN: | 1520-510X |
Aparece en las colecciones: | (ISQCH) Artículos |
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