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Título: | A cyclometalated N-heterocyclic carbene: the wings of the first Pt2 (II,II) butterfly oxidized by CHI3 |
Autor: | Arnal, Lorenzo CSIC ORCID; Fuertes, Sara CSIC ORCID; Martín, Antonio CSIC ORCID; Baya, Miguel CSIC ORCID; Sicilia, Violeta CSIC ORCID | Palabras clave: | Bridging pyrazolate Cyclometalated NHC Dinuclear PtIII Molecular butterfly Oxidative addition |
Fecha de publicación: | 2018 | Editor: | Wiley-VCH | Citación: | Chemistry - A European Journal 24(70): 18743-18748 (2018) | Resumen: | The X-ray study on a single crystal of the butterfly-like complex [{Pt(C^C*)(μ-pz)}2 ] (1), containing a cyclometalated N-heterocyclic carbene ligand as wings (HC^C*=1-(4-(ethoxycarbonyl)phenyl)-3-methyl-1H-imidazol-2-ylidene), showed three molecules in the asymmetric unit with intermetallic separations (Å) of 3.2294(4) (1A), 3.2834(4) (1B), and 3.1208(6) (1C). From the reaction of 1 with excess of CHI3 in the air and the sunlight, complex [{Pt(C^C*)(μ-pz)I)}2 ] (2) (dPt-Pt =2.6079(2) Å) was obtained as the major product, while [IPt(C^C*)(μ-pz)2 Pt(C^C*)CHI2 ] (3) (dPt-Pt =2.6324(3) Å) was obtained as the major product under argon atmosphere in the dark. Experimental and theoretical investigations showed that an easily accessible radical-like mechanism operates under thermal conditions, with dioxygen acting as an efficient radical (R. ) scavenger. The oxidation of a Pt2 (II,II) "butterfly" by CHI3 to give metal-metal bonded Pt2 (III,III) compounds is described now for the first time. | Descripción: | Dedicated to Professor Ernesto Carmona on the occasion of his 70th birthday. | Versión del editor: | https://doi.org/10.1002/chem.201804013 | URI: | http://hdl.handle.net/10261/185097 | DOI: | 10.1002/chem.201804013 | ISSN: | 0947-6539 | E-ISSN: | 1521-3765 |
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