A Cyclometalated N-Heterocyclic Carbene: The Wings of the First Pt2(II, II) Butterfly Oxidized by CHI3

Arnal, L. ; Fuertes, S. ; Martín, A. (Universidad de Zaragoza) ; Baya, M. (Universidad de Zaragoza) ; Sicilia, V. (Universidad de Zaragoza)

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)2Pt(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.

Idioma: Inglés

DOI: 10.1002/chem.201804013

Año: 2018

Publicado en: Chemistry - A European Journal 24, 70 (2018), 18743-18748
ISSN: 0947-6539

Factor impacto JCR: 5.16 (2018)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 36 / 172 = 0.209 (2018) - Q1 - T1

Factor impacto SCIMAGO: 1.842 - Catalysis (Q1) - Organic Chemistry (Q1) - Chemistry (miscellaneous) (Q1)

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)