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Donor Behaviour of Anionic and Asymmetric Phosphanido Derivatives of Platinum and Palladium
Andersson Arias, Juan Forniés, Consuelo Fortuño, Antonio Martín, Piero Mastrorilli, Vito Gallo, Mario Latronico and Stefano Todisco
Eur. J. Inorg. Chem. 2014, 1679-1693
DOI: 10.1002/ejic.201300808

The reactions of [Ag(OClO3)(PPh3)] with [NBu4][(C6F5)2Pt(μ-PPh2)2M(hq)], [NBu4][(C6F5)2Pt(μ-PPh2)2M(bq)], [NBu4][(C6F5)2Pt(μ-PPh2)2M(pic)] and [NBu4][(C6F5)2Pt(μ-PPh2)2Pt(C6F5)(tht)] (M = Pt, Pd; hq = 8-hydroxyquinolinate, bq = benzoquinolinate, pic = picolinate, tht = tetrahydrothiophene) afford the corresponding neutral adducts [(C6F5)2Pt(μ-PPh2)2(μ-AgPPh3)M(bq)] (M = Pt, 1; Pd, 2), [(C6F5)2Pt(μ-PPh2)2(μ-AgPPh3)M(hq)] (M = Pt, 3; Pd, 4) [(C6F5)2Pt(μ-PPh2)2(μ-AgPPh3)Pt(C6F5)(tht)] (5) and [(C6F5)2Pt(μ-PPh2)2M(pic-AgPPh3)] (M = Pt, 6; Pd, 7) as yellow solids. The XRD structures of 1–5, in which a [AgPPh3]+ moiety bridges the metal centres, were confirmed in solution at low temperature. At room temperature, a dynamic process for the [AgPPh3]+ moiety, which passes from the top to the bottom part of the molecules 1–5, was ascertained. For 6 and 7, the XRD analyses revealed structures in which the [AgPPh3]+ moiety is linked to the picolinate oxygen atom bonded to the M centre; however, although such a structure was confirmed in solution for the Pt–Pd species 7, the stable form of the Pt–Pt species 6 in solution is that with the [AgPPh3]+ moiety bridging the metal centres.

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